JP7606089B2 - Light source - Google Patents

Description

This disclosure relates to a light source device.

In recent years, light source devices using multiple light-emitting elements such as light-emitting diodes have come into widespread use. For example, Patent Document 1 discloses a light source device that can be used as a flash for a small camera such as a camera mounted on a mobile phone.

Patent No. 5275557

Such light source devices, for example those used in camera flashes, are required to be able to selectively illuminate the desired illumination area.

Therefore, the present disclosure aims to provide a light source device that can selectively illuminate a desired illumination area.

The light source device according to the present disclosure is a light source device for irradiating light to two or more irradiation areas, and includes a plurality of light-emitting units having a light-emitting surface on the upper surface and provided on a mounting surface on the same plane corresponding to each of the irradiation areas, and optical means for irradiating the light emitted from each light-emitting unit to the irradiation area corresponding to the light-emitting unit, and the plurality of light-emitting units include inclined light-emitting units whose light-emitting surface is inclined with respect to the mounting surface, and the light-emitting surfaces of the plurality of light-emitting units are directed in the direction of the corresponding irradiation area.

Another light source device according to the present disclosure is a light source device for irradiating light to two or more irradiation areas, and includes a plurality of light-emitting units having a light-emitting surface on the upper surface and provided on a mounting surface on the same plane corresponding to each of the irradiation areas, and optical means for irradiating the light emitted from each of the light-emitting units to the irradiation area corresponding to the light-emitting unit, the optical means being disposed above each of the plurality of light-emitting units and including a Fresnel lens having a flat upper surface and an uneven lower surface, the upper surface of the Fresnel lens being inclined with respect to the mounting surface and facing the direction of the corresponding irradiation area.

The light source device according to one embodiment of the present disclosure can selectively illuminate a desired illumination area.

FIG. 2 is a cross-sectional perspective view of the light source device according to the first embodiment of the present disclosure. 2 is a top view of light-emitting sections of the light source device shown in FIG. 1, illustrating an arrangement of the light-emitting sections. FIG. 2 is a diagram illustrating the relationship between a light-emitting portion of the light source device shown in FIG. 1 and an illumination region provided corresponding to the light-emitting portion. FIG. 2 is a cross-sectional view taken along line AA of the light source device shown in FIG. 1, illustrating how light emitted from a light-emitting portion irradiates a corresponding irradiation area via an optical lens. 5 is an enlarged view of a part of the light-emitting section shown in FIG. 4. 5B is a diagram showing another form of the light-emitting portion shown in FIG. 5A. 5B is a diagram showing another form of the light-emitting portion shown in FIG. 5A. This is one step in the manufacturing method of the light-emitting part with an inclined light-emitting surface. This is one step in the manufacturing method of the light-emitting part with an inclined light-emitting surface. This is one step in the manufacturing method of the light-emitting part with an inclined light-emitting surface. This is one step in the manufacturing method of the light-emitting part with an inclined light-emitting surface. This is one step in the manufacturing method of the light-emitting part with an inclined light-emitting surface. This is one step in the manufacturing method of the light-emitting part with an inclined light-emitting surface. This is one step in the manufacturing method of the light-emitting part with an inclined light-emitting surface. FIG. 11 is a cross-sectional view of a light source device according to a second embodiment of the present disclosure. 11 is a cross-sectional view of a light source device according to a second embodiment of the present disclosure, in which a plurality of light-emitting sections 52 are covered by one lens. FIG. 11 is a cross-sectional view of a light source device according to a second embodiment of the present disclosure, in which a plurality of light-emitting sections are covered by one lens. FIG. 7B is a diagram illustrating the light distribution by a unit first lens of the light emitted from the light-emitting portion in the cross-sectional view shown in FIG. 7A. FIG. 8B is a diagram illustrating the light distribution when the angle of the outer surface of the convex portion of the unit first lens with respect to the optical axis is smaller than the angle of the outer surface of the convex portion of the unit first lens with respect to the optical axis shown in FIG. 8A. 8C is a diagram illustrating the light distribution when the angle of the outer surface of the convex portion of the unit first lens with respect to the optical axis is smaller than the angle of the outer surface of the convex portion of the unit first lens with respect to the optical axis shown in FIG. 8B. 10 is a cross-sectional view showing the configuration of another unit first lens in the light source device of embodiment 2. FIG. 9B is a cross-sectional view of the light source device shown in FIG. 9A in which a plurality of light-emitting units are covered with one lens. 9B is a cross-sectional view of the light source device shown in FIG. 9A in a case where unit first lenses are connected to each other. 9B is an enlarged view of a portion of the light-emitting section shown in FIG. 9A, illustrating the light distribution by a unit first lens of the light emitted from the light-emitting section. FIG. FIG. 11 is a cross-sectional view of a light source device according to a third embodiment of the present disclosure. 11B is a cross-sectional view of the light source device shown in FIG. 11A in which a plurality of light-emitting parts are covered with one lens. 13A to 13C are diagrams illustrating the relationship between light-emitting sections and irradiation regions provided corresponding to the light-emitting sections in a light source device according to a fourth embodiment of the present disclosure. FIG. 11 is a cross-sectional view of a light source device according to a fourth embodiment of the present disclosure. 13 is a cross-sectional view of a light source device according to a fourth embodiment of the present disclosure, in which a plurality of light-emitting sections 52 are covered by one lens. FIG. 11 is a cross-sectional view showing a modified example of a light-emitting section in an embodiment of the present disclosure. 11 is a cross-sectional view showing a modified example of a light-emitting section in an embodiment of the present disclosure. This is one step in the manufacturing method of the light emitting portion assembly. This is one step in the manufacturing method of the light emitting portion assembly. This is one step in the manufacturing method of the light emitting portion assembly. This is one step in the manufacturing method of the light emitting portion assembly. This is one step in the manufacturing method of the light emitting portion assembly. 13 is a step in another method for manufacturing a light emitting portion assembly. 13 is a step in another method for manufacturing a light emitting portion assembly. 13 is a step in another method for manufacturing a light emitting portion assembly. 13 is a step in another method for manufacturing a light emitting portion assembly. 13 is a step in another method for manufacturing a light emitting portion assembly. FIG. 11 is a cross-sectional view of a light source device according to a fifth embodiment of the present disclosure. 13 is a graph showing a simulation result according to Example 1-1. FIG. 13 is a diagram showing a simulation result according to Example 1-1. 13 is a graph showing a simulation result according to Example 1-2. FIG. 13 is a diagram showing a simulation result according to Example 1-2. 13 is a graph showing a simulation result according to Example 2. FIG. 13 is a diagram showing a simulation result according to the second embodiment. 13 is a graph showing a simulation result according to Example 3-1. FIG. 13 is a diagram showing a simulation result according to Example 3-1. 13 is a graph showing a simulation result according to Example 3-2. FIG. 13 is a diagram showing a simulation result according to Example 3-2. 11 is a graph showing a simulation result according to Reference Example 1. FIG. 11 is a diagram showing a simulation result according to Reference Example 1. 13 is a graph showing a simulation result according to Comparative Example 1. FIG. 13 is a diagram showing a simulation result according to Comparative Example 1. 1A to 1C are diagrams illustrating diagonal cross sections and light emission directions in an embodiment, a reference example, and a comparative example.

Hereinafter, embodiments and examples for carrying out the present disclosure will be described with reference to the drawings. Note that the light source device described below is intended to embody the technical idea of the present disclosure, and unless otherwise specified, the present disclosure is not limited to the following.
In each drawing, components having the same function may be given the same symbol. In consideration of the explanation or ease of understanding of the main points, the embodiments and examples may be shown separately for convenience, but partial replacement or combination of the configurations shown in different embodiments and examples is possible. In the embodiments and examples described below, descriptions of matters common to the above will be omitted, and only the differences will be described. In particular, similar effects due to similar configurations will not be mentioned in each embodiment or example. The size and positional relationship of the components shown in each drawing may be exaggerated to clarify the explanation.

In light source devices used in camera flashes and the like, the shape of the lens can be appropriately designed according to the positional relationship between the light-emitting unit and the illumination area illuminated by the light emitted from the light-emitting unit, so that the light emitted from the light-emitting unit can be irradiated onto the corresponding desired illumination area. However, depending on the positional relationship between the light-emitting unit and the corresponding illumination area, the dimensions of the lens may become large. Improvements to such large lenses are required for light source devices that require miniaturization, such as cameras installed in mobile phones.

In one embodiment, the light emitting surface of the light emitting unit is tilted toward the desired irradiation area, so that the light emitted from the light emitting unit can be selectively irradiated onto the desired irradiation area without relying solely on the lens shape design. This makes it possible to obtain a light source device that can selectively irradiate the light emitted from the light emitting unit onto the desired irradiation area and that is also compact.

The light source device according to the present disclosure is a light source device for irradiating light to two or more irradiation areas, and includes a plurality of light-emitting units having a light-emitting surface on the upper surface and provided on a mounting surface on the same plane corresponding to each of the irradiation areas, and optical means for irradiating the light emitted from each light-emitting unit to the irradiation area corresponding to the light-emitting unit, and the plurality of light-emitting units include inclined light-emitting units whose light-emitting surface is inclined with respect to the mounting surface, and the light-emitting surfaces of the plurality of light-emitting units are directed in the direction of the corresponding irradiation area.

The light source device according to the present disclosure is a light source device for irradiating light to two or more irradiation areas, and includes a plurality of light-emitting units having a light-emitting surface on the upper surface and provided on a mounting surface on the same plane corresponding to each of the irradiation areas, and optical means for irradiating the light emitted from each light-emitting unit to the irradiation area corresponding to the light-emitting unit, the optical means being disposed above each of the plurality of light-emitting units and including a Fresnel lens having a flat upper surface and an uneven lower surface, the upper surface of the Fresnel lens being inclined with respect to the mounting surface and facing the direction of the corresponding irradiation area.

EMBODIMENT 1
Hereinafter, a light source device according to a first embodiment of the present disclosure will be described with reference to the drawings.
The light source device 1 according to the present embodiment is a light source device for irradiating two or more irradiation areas with light emitted from a light-emitting unit. Here, the irradiation area is an area having a certain direction as a center and a surrounding area. In the present embodiment, the two or more irradiation areas are areas in which the centers of the individual irradiation areas are separated by a predetermined distance, have a predetermined size, and are individually irradiated with the light irradiated from the light-emitting unit when the two or more light-emitting units are individually turned on. In addition, it means that the light emitted from the two or more light-emitting units is not collected and irradiated, but is each an area individually irradiated with the light emitted from the two or more light-emitting units. In the light source device 1 according to the present embodiment, as described later, a plurality of light-emitting units are provided so as to correspond to a plurality of irradiation areas having different directions. As a result, the light can be irradiated to a desired irradiation area by selecting and turning on one or more of the plurality of light-emitting units. As shown in FIG. 1, the light source device 1 has a light-emitting surface on its upper surface, and is equipped with a plurality of light-emitting sections provided on a mounting surface 2a on the same plane corresponding to each irradiation area, and optical means for irradiating the light emitted from each light-emitting section onto the irradiation area corresponding to the light-emitting section.
The light emitting unit 52 includes a light emitting unit 51 with an inclined light emitting surface, whose light emitting surface 51a is inclined with respect to the mounting surface 2a. The light emitting surface 51a of the inclined light emitting unit 51 is oriented toward the corresponding irradiation area. Here, the light emitting surface is oriented toward the corresponding irradiation area when the irradiation area is considered to be a plane for convenience, and the normal line passing through the center point of the light emitting surface penetrates the irradiation area. The light emitting unit 52 may further include a central light emitting unit 50 having a light emitting surface 50a parallel to the mounting surface 2a of the board 2. The light emitting surface 50a of the central light emitting unit 50 is oriented toward the corresponding irradiation area. In this embodiment, eight light emitting units 51 with an inclined light emitting surface are arranged around one central light emitting unit 50, and a total of nine light emitting units 52 are shown. Hereinafter, the light emitting surface 50a of the central light emitting unit 50 and the light emitting surface 51a of the inclined light emitting unit 51 are collectively referred to as the light emitting surface 52a.

The mounting surface 2 a is the upper surface of the substrate 2 .
The light emitting portions 52 are disposed on the mounting surface 2a.
The optical means includes an optical lens 30 provided above the light-emitting unit 52. The optical lens 30 focuses or projects the light emitted from the light-emitting unit 52 toward a corresponding irradiation area. The optical lens 30 includes a first surface 31 located on the light-emitting unit 52 side and a second surface 32 located on the opposite side to the first surface 31. The first surface 31 includes an entrance area 33 that allows the light from the light-emitting unit 52 to enter the optical lens 30. The second surface 32 includes an exit area 34 that allows the light incident from the entrance area 33 to exit from the optical lens 30.
Therefore, the light emitted from each light-emitting section 52 enters the optical lens 30 from the corresponding entrance area 33, exits the optical lens 30 via the exit area 34 corresponding to the entrance area 33, and then irradiates the irradiation area corresponding to each light-emitting section 52, respectively.
In this embodiment, the frame 3 that covers the light emitting portion 52 and the optical lens 30 is disposed on the mounting surface 2 a of the substrate 2 .

Here, in order to facilitate understanding of the internal structure of the light source device 1, the optical lens 30 and the frame 3 in Fig. 1 are shown in cross section with parts thereof omitted. Furthermore, the entrance area 33 and the exit area 34 shown in the figure are exaggerated in order to show the areas.
Moreover, for example, the emission region 34 that "corresponds" to the entrance region 33 means a region that causes the light that has entered the optical lens 30 from the entrance region 33 to exit the optical lens 30, and is provided in a one-to-one relationship with the entrance region 33. Furthermore, for example, the irradiation region that "corresponds" to the light-emitting unit 52 means a region that is the target of irradiation with the light emitted from the light-emitting unit 52, and is provided in a one-to-one relationship with the light-emitting unit 52.
In this specification, the term "corresponding" means a relationship between regions, members and regions, etc. that is related to each other.

(Arrangement of light-emitting part)
The light-emitting sections 52 are arranged in a matrix of 3 rows and 3 columns as shown in Figures 1 and 2. The light-emitting sections 52 are arranged at equal intervals such that the distances between the center points of adjacent light-emitting sections 52 are approximately the same. Although the light-emitting sections 52 are arranged apart from each other in Figures 1 and 2, they may be arranged in contact with each other.
Which of the light-emitting sections 52 is the inclined light-emitting surface light-emitting section 51 depends on the positional relationship between the light-emitting section 52 and the irradiation area, which will be described later. In this embodiment, due to the positional relationship between the light-emitting section 52 and the irradiation area, eight light-emitting sections except for the central light-emitting section 50 arranged in the second row and second column are the inclined light-emitting surface light-emitting section 51, and the light-emitting surface 50a of the central light-emitting section 50 is parallel to the mounting surface 2a.
In addition, the central light-emitting portion 50 and the inclined light-emitting surface light-emitting portion 51 may each be disposed rotated about the center point when viewed from above.

In this embodiment, the central light-emitting unit 50 and the inclined light-emitting surface light-emitting unit 51 each have a rectangular shape when viewed from above, but this is not limited thereto. For example, the central light-emitting unit 50 and/or each inclined light-emitting surface light-emitting unit 51 may have another polygonal or circular shape when viewed from above. Furthermore, the dimensions of the light-emitting surfaces of the central light-emitting unit 50 and the inclined light-emitting surface light-emitting unit 51 when viewed from above may be different from each other. For example, the shape of the light-emitting surface 50a of the central light-emitting unit 50 when viewed from above may be the largest. In other words, the sizes of the light-emitting surface 50a of the central light-emitting unit 50 and the light-emitting surface 51a of the inclined light-emitting surface light-emitting unit 51 may differ depending on the locations where the central light-emitting unit 50 and the inclined light-emitting surface light-emitting unit 51 are disposed.

The number of light-emitting units 52 is not limited to nine, but may be two or more. Furthermore, the arrangement of the multiple light-emitting units 52 is not limited to a matrix of m rows and m columns (m≧2), but may be a matrix of m rows and n columns (m≧1, n≧2, m≠n), or may be an arrangement that is not a matrix. Since the multiple light-emitting units 52 each have a corresponding irradiation area, the arrangement of the multiple irradiation areas may be a matrix of i rows and i columns (i≧2), a matrix of i rows and j columns (i≧1, j≧2, i≠j), or may be an arrangement that is not a matrix. That is, it is desirable that the number of irradiation areas is the same as the number of light-emitting units 52. In addition, the distance between adjacent light-emitting units 52 or adjacent light-emitting surfaces 52a may be different. That is, the distance between two light-emitting units 52 adjacent to each other in the row direction or the distance between two light-emitting surfaces 52a adjacent to each other in the column direction may be shorter than the distance between two light-emitting units 52 adjacent to each other in the column direction or the distance between two light-emitting surfaces 52a. For example, four central light-emitting units 50 may be arranged in two rows and two columns, and a total of 12 inclined light-emitting surface units 51 may be arranged on the outer periphery of the central light-emitting unit 50 with four on each side. This allows the irradiation range to be expanded. Alternatively, four central light-emitting units 50 may be arranged in two rows and two columns, and a total of 12 inclined light-emitting surface units 51 may be arranged on the outer periphery of the central light-emitting unit 50 with four on each side, and a total of eight inclined light-emitting surface units 51 may be arranged on the outer periphery with two on each side excluding the corners. This allows the light-emitting unit 52 to have a shape close to a circle in a plan view, and by making the optical lens 30 circular in a plan view, the light from the light-emitting unit 52 can be efficiently incident on the optical lens 30.

(Arrangement of Irradiation Areas)
As shown in Fig. 3, the light source device 1 according to this embodiment irradiates light to an area R1 that is divided into nine irradiation areas. The areas R1 are virtual areas that are arranged at a predetermined distance depending on the use of the light source device 1 when the light source device 1 is designed. The nine irradiation areas are arranged in a matrix of three rows and three columns. One irradiation area is provided corresponding to one light-emitting section 52, and is irradiated with light emitted from the corresponding light-emitting section 52.
Here, the region R1 and each irradiation region shown in the figure are depicted in a schematic plane to facilitate understanding of the contents of the invention, but may actually be a three-dimensional space.

(Arrangement Relationship Between Light Emitting Unit and Irradiation Area)
3, in this embodiment, the positional relationship between each light-emitting portion 52 and the irradiation area corresponding to the light-emitting portion 52 is point-symmetric with respect to a point O located directly above the center point P of the light-emitting surface 50a of the central light-emitting portion 50. In other words, each light-emitting portion 52 and the irradiation area irradiated with light emitted from the light-emitting portion 52 are positioned in a point-symmetrical relationship with respect to a point unique to the light-emitting portion 52, and the point corresponding to each of the multiple light-emitting portions 52 is the same point (point O).
For example, the irradiation region R22 arranged in the second row and second column of the nine irradiation region is an irradiation region corresponding to the central light-emitting portion 50 arranged in the second row and second column of the nine light-emitting portions 52. For example, the irradiation region R23 arranged in the second row and third column of the nine irradiation region is an irradiation region corresponding to the inclined light-emitting surface light-emitting portion 51 arranged in the second row and first column of the nine light-emitting portions 52. For example, the irradiation region R31 arranged in the third row and first column of the nine irradiation region is an irradiation region corresponding to the inclined light-emitting surface light-emitting portion 51 arranged in the first row and third column of the nine light-emitting portions.
As described above, the light-emitting units 52 and the corresponding irradiation areas are provided in a one-to-one relationship, but this does not mean that the light emitted from the light-emitting unit 52 is limited to irradiating only the corresponding irradiation area. The irradiation area corresponding to the light-emitting unit 52 is the irradiation area that the light-emitting unit 52 is intended to irradiate. Therefore, in reality, the light emitted from one light-emitting unit 52 may also irradiate an adjacent irradiation area (or a nearby irradiation area).

In the above description, the arrangement of the light-emitting sections 52 and the corresponding illumination regions is in point-symmetrical relationship with respect to a single point O, but the present invention is not limited to this.
For example, the reference point for point symmetry may be different for each light-emitting unit 52. That is, each light-emitting unit 52 and the irradiation area corresponding to the light-emitting unit 52 are arranged in a point-symmetric relationship with respect to a point located on the optical axis of the light-emitting unit 52. Also, for example, the reference point for point symmetry (point O in this embodiment) does not have to be located directly above the center point P of the light-emitting surface 50a.

(Distribution of light emitted from each light-emitting unit)
Next, with reference to FIG. 1, the light distribution of the light emitted from the central light-emitting portion 50 and the inclined light-emitting surface light-emitting portion 51 until the light illuminates the corresponding illumination area will be described.
Light is emitted from the light-emitting surface 50a of the central light-emitting unit 50 and the light-emitting surface 51a of the inclined light-emitting surface light-emitting unit 51 in the normal direction of the light-emitting surface 50a and the light-emitting surface 51a at a first full angle at half maximum θ1. The light emitted from the light-emitting surface 50a and the light-emitting surface 51a enters the optical lens 30 from an entrance region 33 provided corresponding to the central light-emitting unit 50 or the inclined light-emitting surface light-emitting unit 51. The light that entered the optical lens 30 exits the optical lens 30 from an exit region 34 provided corresponding to each entrance region 33, and illuminates the corresponding illumination region.

In the light source device 1 disclosed in this embodiment, elements for irradiating the light emitted from each light-emitting section 52 to the corresponding irradiation area include the emission direction of the light from the light-emitting section 52, the refraction of the light in the entrance area 33, and the refraction of the light in the exit area 34.
The direction in which light is emitted from the light-emitting portion 52 is determined mainly by the inclination angle of the light-emitting surface 52a with respect to the mounting surface 2a (hereinafter also simply referred to as the inclination angle of the light-emitting surface 52a).
The refraction of light in the incident region 33 is determined mainly by the refractive index difference between the refractive index of the optical lens 30 and the refractive index of the medium in contact with the optical lens 30 , and the shape of the incident region 33 on the first surface 31 of the optical lens 30 .
The refraction of light in the exit region 34 is determined primarily by the refractive index difference between the refractive index of the optical lens 30 and the refractive index of the medium in contact with the optical lens 30 , and the shape of the exit region 34 on the second surface 32 of the optical lens 30 .

The difference in refractive index between the optical lens 30 and the medium in contact with the optical lens 30 is a parameter that can be set appropriately. Therefore, by appropriately setting the inclination angle of the light-emitting surface 52a, the shape of the entrance area 33 on the first surface 31, and the shape of the exit area 34 on the second surface 32, it is possible to irradiate the light from the light-emitting unit onto the corresponding irradiation area. The inclination angle of the light-emitting surface 52a, the shape of the entrance area 33, and the shape of the exit area 34 are set, for example, by simulation, taking the parameters into consideration.
Each of the components will be described in detail below with reference to FIGS. 1, 4 and 5A.

(substrate)
The substrate 2 is a wiring board having connection electrodes on a mounting surface 2a thereof. The connection electrodes are connected to electrodes 44 of a central light-emitting portion 50 and an inclined light-emitting surface light-emitting portion 51, which will be described later.

(Frame)
As shown in Figs. 1 and 4, a frame 3 is disposed on the mounting surface 2a of the substrate 2. The frame 3 is hollow and has an opening 4 at the top. The frame 3 is preferably provided with a light absorbing material on the inner surface that does not reflect light. The light absorbing material is formed from, for example, polycarbonate, silicone resin, PPS (Poly Phenyl Sarphayed), PA66 (Nylon 66), and LCP (Liquid Crystal Plastic). The entire frame 3 may be formed from a light absorbing material. A central light emitting portion 50, a light emitting surface inclined light emitting portion 51, and an optical lens 30 are disposed in the cavity of the frame 3.

(Light emitting part)
As described above, the light emitting portion 52 including the central light emitting portion 50 and the inclined light emitting surface light emitting portion 51 is disposed on the mounting surface 2a.
5A , the light-emitting section 52 has a wavelength conversion member 45 between the light-emitting element 42 and the light-transmitting member 47. In the present embodiment, as shown in FIG. 5A , the wavelength conversion member 45 is disposed so as to cover the upper surface of the light-emitting element 42, and the light-transmitting member 47 is disposed so as to cover the upper surface of the wavelength conversion member 45. The central light-emitting section 50 and the inclined light-emitting surface light-emitting section 51 further include a light-reflective member 46 that covers the side surfaces of the light-emitting element 42, the side surfaces of the wavelength conversion member 45, and the side surfaces of the light-transmitting member 47.

The light emitted from the light-emitting element 42 is emitted from the upper surface of the light-transmitting member 47 to the outside of the central light-emitting unit 50 and the inclined light-emitting surface light-emitting unit 51. Therefore, the upper surface of the light-transmitting member 47 is the light-emitting surface 50a of the central light-emitting unit 50 and the light-emitting surface 51a of the inclined light-emitting surface light-emitting unit 51. In other words, the light-emitting unit 52 includes the light-emitting element 42 and the light-transmitting member 47 located above the light-emitting element 42, and the light-emitting surface 52a is the upper surface of the light-transmitting member 47.
Further, the upper surface of the light-transmitting member 47 is included in the upper surfaces of the central light-emitting portion 50 and the inclined light-emitting surface light-emitting portion 51 .

The light-emitting element 42 has at least a semiconductor laminate 43 whose external shape is a substantially rectangular parallelepiped, and an electrode 44 having two polarities (e.g., a P-side electrode and an N-side electrode). The electrode 44 is electrically connected to the connection electrode of the above-mentioned substrate 2. The semiconductor laminate 43 is arranged so that its upper and lower surfaces are substantially parallel to the mounting surface 2a. When the light-emitting element 42 is mounted face-down, it is desirable for the light-emitting element 42 to mainly emit light from the surface opposite to the surface on which the electrode 44 is provided (hereinafter referred to as the upper surface of the light-emitting element 42).

The wavelength conversion member 45 is formed, for example, from a silicone resin containing a phosphor. By covering the upper surface of the light-emitting element 42 with the wavelength conversion member 45, light in a desired wavelength region can be emitted from the light-emitting surface 52a of the light-emitting section 52. The wavelength conversion member 45 is arranged so that its upper surface is approximately parallel to the mounting surface 2a.

The phosphor is a material that absorbs at least a portion of the primary light emitted by the light emitting element 42 and emits secondary light having a wavelength different from that of the primary light. Examples of the phosphor include yttrium aluminum garnet phosphors (e.g., _Y3 (Al,Ga) _5O12 :Ce), lutetium aluminum garnet phosphors (e.g., _Lu3 (Al,Ga) _5O12 :Ce), terbium aluminum garnet phosphors (e.g., _Tb3 (Al,Ga) _5O12 :Ce), β-sialon phosphors (e.g., (Si,Al) ₃ (O,N) ₄ : _Eu ), α-sialon phosphors (e.g. _, Ca( _Si ,Al) ₁₂ (O,N) ₁₆ :Eu), CASN phosphors (e.g., _CaAlSiN3 :Eu), and SCASN phosphors (e.g., (Sr,Ca) _AlSiN3 :Eu). Examples of the phosphors that can be used include nitride phosphors such as _K2SiF6 : _Mn , KSF phosphors (e.g., _K2 (Si,Al) _F6 :Mn), fluoride phosphors such as KSF phosphors (e.g., _K2SiF6 :Mn), KSAF phosphors (e.g., K2(Si,Al) _F6 :Mn) or MGF phosphors (e.g., 3.5MgO.0.5MgF2.GeO2:Mn), phosphors having a perovskite structure (e.g., CsPb(F,Cl,Br,I) ₃ ), and quantum dot phosphors (e.g., CdSe, InP, _AgInS2 , or _AgInSe2 ). One of these phosphors can be used alone, or two or more of these phosphors can be used in combination.

The light-transmitting member 47 can be formed using, for example, a light-transmitting resin material or an inorganic material such as ceramics or glass. As the resin material, a thermosetting resin such as a silicone resin, a silicone-modified resin, an epoxy resin, or a phenolic resin can be used. In addition, a thermoplastic resin such as a polycarbonate resin, an acrylic resin, a methylpentene resin, or a polynorbornene resin can be used. In particular, a silicone resin or a modified resin thereof, which has excellent light resistance and heat resistance, is preferable.
The light-transmitting member 47 may contain a light diffusing material. Examples of the light diffusing material contained in the light-transmitting member 47 include titanium oxide, barium titanate, aluminum oxide, and silicon oxide.
As described above, the upper surface of the light-transmitting member 47 is the light-emitting surface 52a of the light-emitting portion 52, that is, the light-emitting surface 50a of the central light-emitting portion 50 and the light-emitting surface 51a of the inclined light-emitting surface light-emitting portion 51. The light-emitting surface 50a of the central light-emitting portion 50 is parallel to the mounting surface 2a and is directed toward the corresponding irradiation area located directly above the central light-emitting portion 50. On the other hand, the light-emitting surface 51a of the inclined light-emitting surface light-emitting portion 51 is inclined with respect to the mounting surface 2a and is directed toward the corresponding irradiation area.

In addition, it is preferable that the upper surface of the translucent member 47 is formed as a rough surface having multiple projections and recesses. This makes it possible to suppress light that is totally reflected on the upper surface of the translucent member 47.

The light-reflective member 46 is, for example, a white resin containing a light diffusing material such as titanium oxide. By covering the side surfaces of the light-emitting element 42, the side surfaces of the wavelength conversion member 45, and the side surfaces of the translucent member 47 with the light-reflective member 46, the light emitted from those side surfaces can be reflected and emitted from the upper surface of the translucent member 47. Therefore, the light emitted from the light-emitting element 42 can be efficiently utilized by the light-reflective member 46. Note that the portion of the light-reflective member 46 that covers the side surfaces of the light-emitting element 42 and the portion that covers the side surfaces of the wavelength conversion member 45 and the translucent member 47 may be separate members.

In addition, in this embodiment, as shown in FIG. 5A, the upper surface of the translucent member 47 is inclined relative to the mounting surface 2a, so that the light-emitting surface 51a of the inclined light-emitting surface light-emitting unit 51 is inclined relative to the mounting surface 2a. However, the inclination of the light-emitting surface 51a of the inclined light-emitting surface light-emitting unit 51 may be achieved by appropriately adjusting the shape of each member, such as by inclining the upper surface of the wavelength conversion member 45 and/or the translucent member 47 relative to the mounting surface 2a.

Next, the inclination angle of the upper surface of the inclined light-emitting surface light-emitting unit 51 will be described.
In this embodiment, the central light-emitting portion 50 and the inclined light-emitting surface light-emitting portion 51 are disposed with the same distance from each other's center points. In addition, the central light-emitting portion 50 and the inclined light-emitting surface light-emitting portion 51 and the corresponding illumination regions are disposed point-symmetrically with respect to a point O located directly above the light-emitting surface 50a.
(1) The inclined light-emitting surface light-emitting unit 51 in the first row and first column, the inclined light-emitting surface light-emitting unit 51 in the first row and third column, the inclined light-emitting surface light-emitting unit 51 in the third row and first column, and the inclined light-emitting surface light-emitting unit 51 in the third row and third column are disposed equidistant from a point O,
the inclination angle of the light-emitting surface 51 a of the inclined light-emitting surface light-emitting unit 51 in the first row and first column, the inclination angle of the light-emitting surface 51 a of the inclined light-emitting surface light-emitting unit 51 in the first row and third column, the inclination angle of the light-emitting surface 51 a of the inclined light-emitting surface light-emitting unit 51 in the third row and first column, and the inclination angle of the light-emitting surface 51 a of the inclined light-emitting surface light-emitting unit 51 in the third row and third column are the same;
(2) the inclined light-emitting surface light-emitting unit 51 in the first row and second column, the inclined light-emitting surface light-emitting unit 51 in the second row and first column, the inclined light-emitting surface light-emitting unit 51 in the second row and third column, and the inclined light-emitting surface light-emitting unit 51 in the third row and second column are disposed equidistant from a point O;
The inclination angle of the light-emitting surface 51a of the inclined light-emitting surface light-emitting section 51 in the first row and second column, the inclination angle of the light-emitting surface 51a of the inclined light-emitting surface light-emitting section 51 in the second row and first column, the inclination angle of the light-emitting surface 51a of the inclined light-emitting surface light-emitting section 51 in the second row and third column, and the inclination angle of the light-emitting surface 51a of the inclined light-emitting surface light-emitting section 51 in the third row and second column are the same.
In this way, when there are two or more inclined light-emitting surfaces 51 arranged at equal distances from a point O, the angles at which the light-emitting surfaces 51a of the inclined light-emitting surfaces 51 are inclined with respect to the mounting surface 2a are the same. In this embodiment, the inclination angles of the light-emitting surfaces 51a of two or more inclined light-emitting surfaces 51 are the same include differences that are generally considered to be manufacturing errors. Even if there are slight differences that are generally considered to be manufacturing errors, the effect of the light source device according to this embodiment can be obtained.

In this embodiment, the light-emitting surface 52a including the light-emitting surface 50a and the light-emitting surface 51a, i.e., the upper surface of the light-transmitting member 47, is a flat surface, but is not limited thereto. The light-emitting surface 52a may be a convex curved surface that curves outward with the apex Q at its center, as shown in FIG. 5B, for example. In this case, the light-emitting surface 50a' and the light-emitting surface 51a' have a rotationally symmetric shape about an axis D that passes through the apex Q and is perpendicular to a plane M that includes the outer periphery of the light-emitting surface 50a' and the light-emitting surface 51a'. The distance d1 between the plane M and the apex Q of the light-emitting surface 50a' and the light-emitting surface 51a' is, for example, about 50 μm. In this way, the light-emitting surface 50a' and the light-emitting surface 51a', which are curved surfaces, function as a convex lens and can diffuse light toward the corresponding irradiation area.

Also, as shown in FIG. 5C, the light-emitting surface 52a'' may be a concave curved surface curved inward with the center of the light-emitting surface 52a'' as the apex S. In this case, the light-emitting surface 50a'' and the light-emitting surface 51a'' have a rotationally symmetric shape with respect to an axis D that passes through the apex S and is perpendicular to a plane M including the outer periphery of the light-emitting surface 50a'' and the light-emitting surface 51a''. The distance d2 between the plane M and the apex S of the light-emitting surface 50a'' and the light-emitting surface 51a'' is, for example, about 50 μm. In this way, the light-emitting surface 50a'' and the light-emitting surface 51a'', which are concave curved surfaces, can further concentrate the light emitted from the translucent member 47. As a result, the light can be efficiently incident on the optical lens 30.

The central light-emitting unit 50 and the inclined light-emitting surface light-emitting unit 51 configured as described above can be independently controlled to light up.

Next, an example of a method for manufacturing the inclined light-emitting surface light-emitting unit 51 configured as described above will be described with reference to FIGS. 6A to 6G.
(1) First, as shown in FIG. 6A, a plurality of light emitting elements 42 are prepared, each of which includes a semiconductor laminate 43 and an electrode 44 disposed on the lower surface of the semiconductor laminate 43.
(2) Next, as shown in Fig. 6B, the light emitting element 42 is placed on the support 60 with its upper surface 42a facing downward. The support 60 is desirably made of a material that is easily detachable from the light emitting element 42. For example, the support 60 is desirably a tape that has adhesiveness that allows the light emitting element 42 to be fixed and that allows it to be detached at an appropriate time, and a UV tape or the like that can change its adhesiveness by UV irradiation can be used.
(3) Next, as shown in Fig. 6C, a first light reflective member 46a is disposed so as to cover the side surface of the light emitting element 42. At this time, if the bottom surface 44a of the electrode 44 is covered with the light reflective member 46a, the first light reflective member 46a is removed to expose the bottom surface 44a. The first light reflective member 46a can be removed by, for example, cutting.
(4) Next, as shown in Fig. 6D, the support 60 is removed from the top surface of the light-emitting element 42, and a second light-reflective member 46b is placed to surround the entire top surface 42a of the light-emitting element 42. The second light-reflective member 46b functions as a frame material that determines the inclination angle of the light-emitting surface 52a of the target light-emitting section 52. Therefore, the height is appropriately adjusted along the entire circumference of the top surface 42a of the light-emitting element 42 according to the inclination angle.
6E, the wavelength conversion member 45 is potted onto the upper surface 42a of the light emitting element 42. The second light reflective member 46b also functions as a frame member at this time.
(6) After or simultaneously with (5), as shown in Fig. 6F, the entire component assembly 10 including the light emitting element 42, the first light reflective member 46a, the second light reflective member 46b, and the wavelength conversion member 45 is tilted. The tilt angle at this time is approximately the same as the tilt angle of the light emitting surface 52a of the target light emitting section 52. Furthermore, with the entire component assembly 10 inclined, the light transmissive member 47 is potted in the area surrounded by the upper surface of the wavelength conversion member 45 and the second light reflective member 46b. The light transmissive member 47 may be potted until its upper surface is approximately the same as the upper surface of the second light reflective member 46b.
(7) Next, as shown in FIG. 6G, the first light reflective member 46a and the second light reflective member 46b are cut at a desired cutting plane CL.
Through the above steps, the light-emitting unit 51 with an inclined light-emitting surface, whose upper surface is inclined at a desired angle, is manufactured.

(Optical Lenses)
The optical lens 30, which is an optical means, is disposed above the plurality of light-emitting units 52, as shown in Figs. 1 and 4. The optical lens 30 is disposed to focus or project the light emitted from each of the light-emitting units 52 onto the irradiation area corresponding to the light-emitting unit 52. The optical lens 30 collectively covers the light-emitting units 52, including the central light-emitting unit 50 and the inclined light-emitting surface unit 51. The optical lens 30 according to this embodiment is composed of a plurality of lenses, and in detail, is composed of a first optical lens 36, a second optical lens 37, and a third optical lens 38, which are disposed in order from the light-emitting unit 52 side. The first optical lens 36, the second optical lens 37, and the third optical lens 38 are disposed with a space between each lens. For example, air is located in the space. The first optical lens 36, the second optical lens 37, and the third optical lens 38 are supported and fixed by disposing their ends on the support unit 5 provided on the inner side surface of the frame 3. Optical Lens Optical Lens The first optical lens 36, the second optical lens 37, and the third optical lens 38 are arranged so that their optical axes coincide with each other. Therefore, the optical axis B1 of the optical lens 30 is specified as one axis. In this embodiment, the optical lens 30 is arranged so that the optical axis B1 is perpendicular to the mounting surface 2a of the substrate 2 and passes through the center point P of the central light-emitting portion 50. Therefore, a point O that defines the point-symmetric arrangement relationship between the central light-emitting portion 50 and the inclined light-emitting surface light-emitting portion 51 and the corresponding irradiation area is located on the optical axis B1 of the optical lens 30.

The method of supporting the first optical lens 36, the second optical lens 37, and the third optical lens 38 is not limited to the method using the support portion 5 provided on the inner side surface of the frame body 3. For example, the first optical lens 36, the second optical lens 37, and the third optical lens 38 may be attached to and supported by a support rod provided on the inner upper surface of the frame body 3.

The optical lens 30 has a first surface 31 located on the side of the light-emitting surface 52a of the light-emitting unit 52, and a second surface 32 located on the opposite side to the first surface 31, i.e., on the side of the opening 4 of the frame body 3. The first surface 31 corresponds to each of the light-emitting units 52 and includes a plurality of entrance regions 33 into which light emitted from each of the light-emitting units 52 is incident. The second surface 32 includes a plurality of exit regions 34 corresponding to each of the entrance regions 33.

When the optical lens 30 has multiple lenses as in this embodiment, the surface closest to the light-emitting unit 52 is the first surface 31, and the surface closest to the irradiation area is the second surface 32. In other words, in this embodiment, the surface of the first optical lens 36 facing the light-emitting unit 52 is the first surface 31, and the surface of the third optical lens 38 facing the opening 4 of the frame 3 is the second surface 32.

As described above, the distribution of light emitted from the light emitting unit 52 depends on the shape of the entrance area 33 on the first surface 31 and the shape of the exit area 34 on the second surface 32. In addition, in this embodiment, the optical lens 30 is composed of three lenses, the first optical lens 36, the second optical lens 37, and the third optical lens 38, which are arranged separated from each other by air. Therefore, the distribution of light between the entrance area 33 and the exit area 34 may be affected by the shape of the area (exit area) from which light exits the first optical lens 36, the difference between the refractive index of the first optical lens 36 and the refractive index of air, the shape of the area (entrance area) from which light enters the second optical lens 37, the shape of the area (exit area) from which light exits the second optical lens 37, the difference between the refractive index of the second optical lens 37 and the refractive index of air, the shape of the area (entrance area) from which light enters the third optical lens 38, and the difference between the refractive index of the third optical lens 38 and the refractive index of air. Therefore, the shape of the entrance area 33 and the shape of the exit area 34 are designed taking these factors into consideration.

The respective entrance areas 33 where the light emitted from the adjacent central light-emitting unit 50 and the inclined light-emitting surface unit 51 enter the optical lens 30 may overlap in part or in whole depending on the size of the full angle at half maximum (direction full angle at half maximum) of the light emitted from the corresponding central light-emitting unit 50 or the inclined light-emitting surface unit 51, the distance from the central light-emitting unit 50 or the inclined light-emitting surface unit 51 to the optical lens 30, the inclination angle of the light-emitting surface 50a of the central light-emitting unit 50 or the light-emitting surface 51a of the inclined light-emitting surface unit 51, etc. Therefore, two adjacent entrance areas 33 of the multiple entrance areas 33 of the optical lens 30 may overlap in part or in whole. Therefore, each entrance area 33 is not necessarily designed independently, but may be appropriately designed in relation to the adjacent entrance area.

Similarly, the exit regions 34 from which the light incident on the optical lens 30 from each of the adjacent entrance regions 33 exits the optical lens 30 may overlap in part or in whole depending on the position of the corresponding entrance region 33, the refractive index difference between the refractive index of the optical lens 30 and the refractive index of the medium in contact with the optical lens 30, the arrangement of the corresponding irradiation regions, etc. Therefore, two adjacent exit regions 34 of the multiple exit regions 34 of the optical lens 30 may overlap in part or in whole. Therefore, each exit region 34 is not necessarily designed independently, but may be appropriately designed in relation to the adjacent exit region 34.

(Light distribution from the light emitting part)
Next, the distribution of light emitted from the central light-emitting portion 50 and the inclined light-emitting surface light-emitting portion 51 will be described in detail with reference to Fig. 4. The arrows in Fig. 4 indicate the distribution of light.
Since the light emitted from both the central light-emitting unit 50 and the inclined light-emitting unit 51 has the same light distribution, the light distribution from the inclined light-emitting unit 51 with its light-emitting surface located in the second row and first column of the nine light-emitting units 52 arranged in a matrix will be described as an example here. The inclined light-emitting unit 51 with its light-emitting surface is the light-emitting unit located on the leftmost side in FIG. 4 .

The light emitted from the light-emitting surface 51a of the inclined-light-emitting-surface light-emitting unit 51 in the normal direction of the light-emitting surface 51a at a first full angle at half maximum θ1 is mainly
(1) entering the optical lens 30 from the corresponding entrance area 33 a;
(2) The light is emitted from an emission area 34a corresponding to the entrance area 33a to the outside of the optical lens 30.
(3) After that, the irradiation area corresponding to the inclined light-emitting surface light-emitting portion 51 is irradiated.
Light is refracted when it enters the optical lens 30 and when it exits from the optical lens 30. This refraction adjusts the irradiation direction of the light emitted from the light-emitting surface 51a, so that the light illuminates the illumination area with higher accuracy. Optical lens Optical lens In addition, since the light is focused by the optical lens 30, the corresponding illumination area can be illuminated with high illuminance.
In the case of light emitted from the central light-emitting unit 50, it illuminates the irradiation area located directly above, but similar to the light emitted from the light-emitting surface 51a of the inclined light-emitting surface unit 51, it is desirable to refract the light so as to be concentrated or projected when it enters the optical lens 30 and when it exits from the optical lens 30.

In this way, by inclining the light-emitting surface 51a toward the corresponding irradiation area in advance, the degree of refraction by the optical lens 30 can be reduced compared to a case where the light-emitting surface is not inclined. This allows the optical lens 30 to be made smaller.
In addition, by inclining the light-emitting surface 51a toward the corresponding irradiation area in advance in this manner, light can be efficiently irradiated in the direction of the optical lens 30, so that the loss of light can be reduced, and light can be irradiated to the corresponding irradiation area with higher accuracy. Furthermore, by inclining the light-emitting surface 51a toward the corresponding irradiation area in advance in this manner, the amount of light emitted from the light-emitting surface 51a that enters the optical lens 30 is greater than when the light-emitting surface 51a is not directed toward the corresponding irradiation area. This makes it possible to prevent light that does not enter the optical lens 30 from being irradiated to an area other than the desired irradiation area by repeating unexpected reflection or refraction, for example, on the inner surface of the frame body 3. This makes it possible to clearly show the difference in brightness between the irradiation area corresponding to the lit light-emitting part and the irradiation area corresponding to the unlit light-emitting part when only a part of the light-emitting parts 52 is turned on.

EMBODIMENT 2
The light source device 101 according to this embodiment is different from the light source device 1 according to the first embodiment in that the optical means is disposed above the light emitting units 52 and is a first lens 110 that narrows or widens the full angle at half maximum of the light emitted from each light emitting unit 52, as shown in FIG. 7A. Also, as shown in FIG. 7A, a translucent protective cover 70 may be disposed in the opening 104 of the frame body 103. This protects the first lens 110 from external forces. It is desirable that the protective cover 70 is a member having a refractive index that is the same as or close to the refractive index of the medium (air in this embodiment) that contacts the protective cover 70. It is also desirable that the protective cover 70 is a member that is strong against external forces and is not easily scratched. For example, the material of the protective cover 70 is acrylic or glass.

(First lens)
The first lens 110 includes a plurality of unit first lenses 111 that correspond to the light-emitting units 52 and are provided separately from each other. Each unit first lens 111 narrows or widens the full angle at half maximum of the light emitted from the corresponding central light-emitting unit 50 or the inclined light-emitting surface unit 51. In this embodiment, the first lens 110 includes the unit first lenses 111 that are separated from each other, but as shown in FIG. 7B, the first lens 110A may be a lens in which the unit first lenses 111 corresponding to each of the light-emitting units 52 are connected to each other and integrated. In the embodiment, the integrated lens includes covering the plurality of light-emitting units 52 with one lens so that the unit first lenses 111 corresponding to each of the light-emitting units 52 are connected to each other. The integrated lens may cover all the light-emitting units 52 collectively.

In addition, the first lens 110A shown in FIG. 7B is arranged so that the upper surface 111a of each unit first lens 111 is approximately parallel to the light-emitting surface 50a (or the light-emitting surface 51a) of the corresponding light-emitting section 50 (or the light-emitting section 51), but is not limited to this.
For example, as shown in Fig. 7C, the upper surface 111b of each unit first lens 111B may be substantially parallel to the mounting surface 2a, and the upper surfaces 111b of each unit first lens 111B may be located on the same plane. In other words, the upper surface of the first lens 110B may be a single plane substantially parallel to the mounting surface 2a. This improves the pick-up property of the first lens 110B when mounting the first lens 110B on the substrate 2, for example. This ultimately improves the production efficiency of the light source device 101.

As shown in FIG. 8A, the unit first lens 111 in this embodiment is a Fresnel lens having a plurality of concentric ring-shaped convex portions 112 on the surface (lower surface) on the side of the light emitting portion 52. Each convex portion 112 has an inner surface (inner surface) 112a of the unit first lens 111 and an outer surface (outer surface) 112b of the unit first lens 111.

The unit first lens 111 is arranged so that, for example, the optical axis C1 passes through the center point of the light-emitting surface 52a of the corresponding light-emitting unit 52 and is perpendicular to the light-emitting surface 52a. Therefore, the light emitted from the unit first lens 111 is also directed toward the corresponding irradiation area. When there are two or more Fresnel lenses (unit first lenses 111) arranged at positions equidistant from a point located on the optical axis of each light-emitting unit 52, it is preferable that the angle at which the upper surface of the Fresnel lens is inclined with respect to the mounting surface 2a is the same. In this embodiment, the angle at which the upper surfaces of two or more Fresnel lenses are inclined with respect to the mounting surface 2a is the same includes a difference that is recognized as a manufacturing error. Even if there is such a slight difference that is generally recognized as a manufacturing error, the action and effect of the light source device according to this embodiment can be obtained.
The unit first lens 111 is supported by, for example, legs 113 connected along the outer periphery of the unit first lens 111. The legs 113 may be formed from the same material as the unit first lens 111, or may be formed integrally with the unit first lens 111. Furthermore, the legs 113 may be disposed so as to surround the entire circumference of the central light-emitting portion 50 and/or the inclined light-emitting surface light-emitting portion 51, or may be disposed in a portion of the circumference of the central light-emitting portion 50 and/or the inclined light-emitting surface light-emitting portion 51.

(Light distribution of light emitted from the light emitting unit)
Next, the distribution of light emitted from the light-emitting unit 52 will be described with reference to Figures 8A, 8B, and 8C. The arrows in Figures 8A, 8B, and 8C indicate the distribution of light.
Since light emitted from either the central light-emitting unit 50 or the inclined light-emitting surface light-emitting unit 51 has the same light distribution, the light distribution from the inclined light-emitting surface light-emitting unit 51 located in the second row and first column of the nine light-emitting units 52 arranged in a matrix will be described as an example here. Note that the inclined light-emitting surface light-emitting unit 51 is the light-emitting unit 52 located on the leftmost side in Fig. 7A.

The light emitted from the light-emitting surface 51a of the inclined-light-emitting-surface light-emitting unit 51 in the normal direction of the light-emitting surface 51a at a first full angle at half maximum θ1 is, for example, as shown in FIG. 8A .
(1) Light is incident on the unit first lens 111 from the inner surface 112 a of each convex portion 112,
(2) reflected by the outer surface 112b of the protrusion 112;
(3) The light is emitted from the surface (upper surface) opposite the lower surface of the unit first lens 111 at a second full angle at half maximum θ2,
(4) Illuminating the corresponding illumination area.

The light from the light emitting unit 52 having such a light distribution is diffused (see FIG. 8A and FIG. 8C) or focused (see FIG. 8B) toward the corresponding irradiation area by appropriately designing the shape of the convex portion 112 of the unit first lens 111. Here, diffusion by the unit first lens 111 means that the second full angle at half maximum θ2 is wider than the first full angle at half maximum θ1, and the irradiation direction of the light diffused by the unit first lens 111 remains directed toward the corresponding irradiation area. Furthermore, focusing by the unit first lens 111 means that the second full angle at half maximum θ2 is narrower than the first full angle at half maximum θ1, and the irradiation direction of the light focused by the unit first lens 111 remains directed toward the corresponding irradiation area.

Since the second full angle at half maximum θ2 of the light incident on the unit first lens 111 is determined mainly by reflection on the outer surface 112b of the convex portion 112, a particularly important factor in the shape, etc., of the convex portion 112 appropriately designed as described above is the angle of the outer surface 112b of the convex portion 112 with respect to the optical axis C1.
As shown in Fig. 8A, when the angle φ0 of the outer surface 112b of the convex portion 112 with respect to the optical axis C1 is larger than the first angle φ1, the light incident on the unit first lens 111 is likely to diffuse. Also, as shown in Fig. 8C, when the angle φ0 of the outer surface 112b of the convex portion 112 with respect to the optical axis C1 is smaller than the second angle φ2 (φ2 < φ1), the light incident on the unit first lens 111 is likely to diffuse. On the other hand, as shown in Fig. 8B, when the angle φ0 of the outer surface 112b of the convex portion 112 with respect to the optical axis C1 is equal to or larger than the first angle φ1 and equal to or smaller than the second angle φ2, the light incident on the unit first lens 111 is likely to be condensed. Therefore, the angle of the outer surface 112b with respect to the optical axis C1 is appropriately designed according to the magnitude of the second full angle at half maximum θ2 with respect to the first full angle at half maximum θ1.
The angle of the outer surface 112b of the convex portion 112 with respect to the optical axis C1 depends on, for example, the curvature of a convex lens used to form the unit first lens 111, which is a Fresnel lens. The first angle φ1 and the second angle φ2 differ for each convex portion 112 and are determined by the positional relationship between each convex portion 112 and the light-emitting portion 52, etc.

The unit first lens is not limited to a Fresnel lens, and when the objective is to focus the light emitted from the light-emitting unit 52, it may be a total internal reflection lens (TIR) lens, a convex lens, or the like, and may be any optical means capable of narrowing the full angle at half maximum of the light emitted from the light-emitting unit 52. When the objective is to diffuse the light emitted from the light-emitting unit 52, it may be any optical means capable of widening the full angle at half maximum of the light emitted from the light-emitting unit 52, such as a total internal reflection lens or a concave lens. A total internal reflection lens is a lens that can adjust the directionality of light by utilizing total reflection inside the lens.

Hereinafter, the light source device 201 in which the unit first lenses are total internal reflection lenses will be described with reference to FIGS. 9A, 9B, 9C, and 10. FIG.
10, the internal total reflection lens used here is a lens having a lower surface 13 with a recess 14 and an upper surface 12 whose cross section is wavy, and is a lens having a substantially truncated cone shape that tapers from the upper surface 12 to the lower surface 13. This internal total reflection lens has, for example, a rotationally symmetric shape about the optical axis C2.
The unit first lens 211, which is an internal total reflection lens having such a shape, is disposed such that the inner surface 14a of the recess 14 is located above the light-emitting surface 51a (or light-emitting surface 50a) of the inclined light-emitting surface light-emitting portion 51 (or central light-emitting portion 50) and covers the light-emitting surface 51a (or light-emitting surface 50a). In other words, the unit first lens 211 is disposed such that the opening end 16 of the recess 14 (the connection portion between the inner surface 14a of the recess 14 and the lower surface 13) is located near the outer periphery of the light-emitting surface 51a (or light-emitting surface 50a) and outside the outer periphery of the light-emitting surface 51a, when viewed from above.

The unit first lenses 211 may be configured as a first lens 210 as a collection of separate components as shown in FIG. 9A, or may be configured as a single continuous component to form the first lens 210A as shown in FIG. 9B.

The shape of the internal total reflection lens used as the unit first lens 211 is not limited to the above shape. For example, as shown in FIG. 9C, the upper surface 211b of each unit first lens 211B may be approximately parallel to the mounting surface 2a, and the upper surfaces 211b of each unit first lens 211B may be located on the same plane. In other words, the upper surface of the first lens 210B may be a single plane approximately parallel to the mounting surface 2a. This improves the pick-up ability of the first lens 210B, for example, when mounting the first lens 210B on the substrate 2. This ultimately improves the production efficiency of the light source device 201.

Next, the distribution of light emitted from each light-emitting portion 52 will be described in detail with reference to Fig. 10. The arrows in Fig. 10 indicate the distribution of light.
Since the light emitted from each of the multiple light-emitting units 52 has the same light distribution, the light distribution from the inclined light-emitting surface light-emitting unit 51 located in the second row and first column of the nine light-emitting units 52 arranged in a matrix will be described as an example here. The inclined light-emitting surface light-emitting unit 51 is the light-emitting unit located on the leftmost side in Fig. 9A.

The light emitted from the light-emitting surface 51a of the inclined-light-emitting-surface light-emitting unit 51 in the normal direction of the light-emitting surface 51a at a first full angle at half maximum θ1 is mainly
(1) Light is incident on the unit first lens 211 from the inner surface 14 a of the recess 14 of the unit first lens 211,
(2) The light is totally reflected by the inner side surface 17 of the unit first lens 211,
(3) The light is emitted from the upper surface 12 of the unit first lens 211 at a second full angle at half maximum θ2.
(4) Irradiate the corresponding irradiation region R23.

The light from the light-emitting unit 52 having such a light distribution can be diffused (see the arrows in Figure 10) or concentrated toward the corresponding illumination area by, for example, appropriately designing the shape of the unit first lens 211.

The light source device 201 configured in this manner can efficiently collect light from the light-emitting unit 52 through the unit first lens 211.

EMBODIMENT 3
As shown in FIG. 11A , the light source device 301 of this embodiment differs from the light source device 1 of embodiment 1 in that the optical means is a first lens 311 that is arranged above a plurality of light-emitting units 52 and narrows the full angle at half maximum of the light emitted from each light-emitting unit 52, and an optical lens 30 that is arranged above the first lens 311 and focuses or projects the light emitted from each light-emitting unit 52 onto an irradiation area corresponding to that light-emitting unit 52.

(First lens)
The first lens 310 is a first lens for collecting light among the first lenses 110 described in the second embodiment. The first lens 310 is composed of a plurality of unit first lenses 311. The unit first lenses 311 according to this embodiment are Fresnel lenses, but may be any lenses capable of collecting light, such as internal total reflection lenses. In addition, the first lens 310 according to this embodiment is composed of unit first lenses 311 separated from each other corresponding to each light emitting unit 52, as shown in FIG. 11A, but the first lens 310A may be a lens in which a plurality of unit first lenses 311 are connected to each other and integrated, as shown in FIG. 11B.
The configuration and arrangement of the unit first lenses 311 according to this embodiment are the same as the configuration and arrangement of the unit first lenses 111 described in the second embodiment, and therefore a detailed description thereof will be omitted here.

(Optical Lenses)
The optical lens 30 may be the same as the optical lens 30 described in embodiment 1. Therefore, the configuration and arrangement of the optical lens 30 according to this embodiment are the same as the configuration and arrangement of the optical lens 30 described in embodiment 1, and detailed description thereof will be omitted here.

(Light distribution of light emitted from the light emitting unit)
Hereinafter, the light distribution in the case where the unit first lens 311 is a Fresnel lens will be described with reference to Fig. 11A. The arrows in Fig. 11A indicate the state of the light distribution.
In addition, since the light emitted from each of the light-emitting units 52 has the same light distribution, the light distribution from the inclined light-emitting surface light-emitting unit 51 located in the second row and first column of the nine light-emitting units 52 arranged in a matrix will be described as an example. The inclined light-emitting surface light-emitting unit 51 is the light-emitting unit located on the leftmost side in FIG. 11A.

The light emitted from the light-emitting surface 51a of the inclined-light-emitting-surface light-emitting unit 51 in the normal direction of the light-emitting surface 51a at a first full angle at half maximum θ1 is mainly
(1) Light is incident on the unit first lens 311 from the inner surface of each convex portion 312 of the unit first lens 311,
(2) The light incident on the unit first lens 311 is totally reflected by the outer surface of each convex portion 312 and is emitted from the upper surface of the unit first lens 311 at a second full angle at half maximum θ2.
(3) The light emitted from the unit first lens 311 is incident on the optical lens 30 from the incident area 33 a corresponding to the inclined light-emitting surface light-emitting portion 51,
(4) The light is emitted from an emission area 34 a corresponding to the entrance area 33 a to the outside of the optical lens 30 .
(5) Irradiate the corresponding irradiation region R23.
Light is refracted when it enters the optical lens 30 and when it exits from the optical lens 30. This refraction adjusts the irradiation direction of the light emitted from the light-emitting surface 51a, and the light illuminates the illumination area with higher accuracy. Optical lens Optical lens Furthermore, the light can illuminate the corresponding illumination area with high illuminance by the optical lens 30.
In the case of light emitted from the central light-emitting part 50, it illuminates the irradiation area located directly above, but similar to the light emitted from the light-emitting surface 51a of the inclined light-emitting surface part 51, it is desirable to refract and concentrate the light when it enters the optical lens 30 and when it exits from the optical lens 30.

In this way, by using the optical lens 30 and the first lenses 310 and 310A as optical means, the light from the light-emitting unit 52 can be irradiated onto the irradiation area with greater precision, and the intensity of the light irradiated onto the corresponding irradiation area can be increased.

EMBODIMENT 4
A light source device 401 according to the fourth embodiment differs from the light source device 1 according to the first embodiment in that the arrangement relationship between the light emitting portion 52 and the irradiation area corresponding to the light emitting portion 52 is not a point-symmetric relationship.
In the fourth embodiment, as shown in Fig. 12, the number of rows and columns in which the light-emitting units 52 are located in the matrix arrangement are the same as the number of rows and columns in which the corresponding irradiation areas are located in the matrix arrangement. For example, the irradiation area R23 arranged in the second row and third column of the nine irradiation areas is an irradiation area corresponding to the inclined light-emitting surface light-emitting unit 51 arranged in the second row and third column of the nine light-emitting units 52. For example, the irradiation area R31 arranged in the third row and first column of the nine irradiation areas is an irradiation area corresponding to the inclined light-emitting surface light-emitting unit 51 arranged in the third row and first column of the nine light-emitting units.

In a light source device 401 in which the light-emitting unit 52 and the corresponding illumination area have such a positional relationship, the inclined light-emitting surface light-emitting unit 51 is arranged so that the light-emitting surface 51a becomes lower from the center of the light source device 401 toward the outer periphery of the light source device 401, as shown in FIG. 13A. In other words, the inclined light-emitting surface light-emitting unit 51 is arranged so that the light-emitting surface 51a becomes lower as it moves away from the central light-emitting unit 50. Note that the lowering of the light-emitting surface 51a means that the distance from the mounting surface 2a of the substrate 2 to the light-emitting surface 51a becomes smaller.

In this way, the light source device 401 in which the number of rows and columns in which the light-emitting units 52 are arranged matches the number of rows and columns in which the corresponding illumination areas are located, diffuses the light emitted from each light-emitting unit 52 toward the outside of the light source device 401.

The first lens 410 of the light source device 401 shown in FIG. 13A is composed of separate unit first lenses 411, but as shown in FIG. 13B, the first lens 410A may be formed by connecting and integrating the unit first lenses 411a. In this case, the upper surface 410a of the first lens 410A may be formed in a single plane that is substantially parallel to the mounting surface 2a. As a result, for example, when the first lens 410A is mounted on the substrate 2, the pickup property of the first lens 410A is improved. This results in improving the production efficiency of the light source device 401. In addition, the first lens 410A in which the unit first lenses 411a are integrated can be formed more easily than the first lens 410 in which the unit first lenses 411 are separated. On the other hand, when the unit first lenses 411 are separated, the thickness of each unit first lens 411 can be formed substantially uniformly, making it easier to design each unit first lens 411.
In addition, as shown in FIG. 13B, when each unit first lens 411a is connected and integrated into a first lens 410A, a frame and a protective cover for covering the light emitting portion 52 and the first lens 410 do not need to be provided.

EMBODIMENT 5
The light source device 501 of this embodiment does not include an inclined light-emitting surface light-emitting section, and differs from the light source device 1 of embodiment 1 in that, as shown in Figure 17, the light-emitting surfaces 552a of all of the multiple light-emitting sections 552 are parallel to the mounting surface 2a of the substrate 2, and the optical means is a first lens 510 arranged above the light-emitting section 552.

The first lens 510 includes a plurality of unit first lenses 511 provided corresponding to the respective light-emitting portions 552, similar to the first lenses described in the second and third embodiments. The unit first lenses 511 may be separate from one another, or may be connected to one another and integrated.
The unit first lens 511 irradiates the light emitted from each light-emitting portion 552 onto an irradiation area corresponding to the light-emitting portion 552. The unit first lens 511, for example, narrows the full angle at half maximum of the light emitted from each light-emitting portion 552 and condenses the light. In addition, the unit first lens 511, for example, widens the full angle at half maximum of the light emitted from each light-emitting portion 552 and diffuses the light.
The unit first lens 511 has a flat upper surface 511a. The upper surface 511a of the unit first lens 511 is inclined with respect to the mounting surface 2a of the substrate 2 and is directed toward the corresponding irradiation area. Here, the fact that the upper surface 511a of the unit first lens 511 is directed toward the corresponding irradiation area means that, when the irradiation area is considered to be a flat surface for convenience, a normal line passing through the center point of the upper surface 511a, i.e., the optical axis C3 of the unit first lens 511, penetrates the irradiation area.

The unit first lens 511 is, for example, a Fresnel lens or a TIR lens. In general, a Fresnel lens can be formed to be thinner than a TIR lens. Therefore, using a Fresnel lens as the unit first lens 511 can make the light source device more compact than using a TIR lens as the unit first lens 511.

Even if only the upper surface 511a of the unit first lens 511 is directed toward the corresponding irradiation area as described above, the light emitted from each light-emitting unit 552 can be irradiated onto the irradiation area corresponding to that light-emitting unit 552.

As shown in FIG. 17 , a light-transmitting protective cover 70 may be disposed in the opening 104 of the frame 103 .
Furthermore, when the unit first lens 511 is used for the purpose of focusing light, the light source device 501 of this embodiment may be equipped with the optical lens 30 equipped in the light source device 1 of embodiment 1 and the light source device 301 of embodiment 3.

Modification 1. Modification Related to the First Lens As described above, the unit first lens may be a lens that achieves the purpose of focusing or diffusing light. Here, specific shapes of lenses according to each purpose will be described.
When the first lens is provided for the purpose of collecting light, the unit first lens may be, for example, a lens having a semicircular cross-sectional shape. In this case, the unit first lens is disposed with its curved surface facing the corresponding irradiation area.
Since such a unit first lens has a simple shape, it is easy to form a mold used to form the unit first lens.

In addition, when the first lens is provided for the purpose of focusing or diffusing light, the unit first lens may be, for example, a frustum-shaped lens. The area of either the upper surface or the lower surface of the frustum-shaped lens is appropriately set according to the purpose of the first lens (focusing or diffusion). In addition, as long as the purpose of focusing or diffusing light is achieved, the first lens may be a columnar lens whose upper surface area is equal to the lower surface area.
Since such a unit first lens has a simple shape, it is easy to form a mold used to form the unit first lens.

These unit first lenses may be provided separately for each light-emitting unit 52, or may be one continuous lens.

2. Modifications Related to Optical Lens In the light source devices according to the above-mentioned first, second and third embodiments, the optical lens is composed of three lenses, but the number of lenses constituting the optical lens is not limited to this. For example, the optical lens may be composed of one lens, may be composed of two lenses, or may be composed of four or more lenses.

In the light source device according to the embodiment equipped with the optical lens described above, the optical lens is supported by a support provided on the inner surface of the frame, but the means for supporting the optical lens is not limited to this. For example, the optical lens may be supported by a leg connected to the outer peripheral end of the first optical lens.

The legs may be formed of, for example, a light reflective material or a light blocking material. The legs may be, for example, a part of an optical lens formed of the same material as the optical lens.
When each optical lens is supported by legs connected to the end of the optical lens in this manner, the light source does not need to include a frame.

3. Modifications Related to Light-Emitting Section In the above embodiment and modifications, the multiple light-emitting sections 52 are disposed apart from one another, but as described above, the multiple light-emitting sections may be disposed in contact with one another.
For example, as shown in Figures 14A and 14B, a plurality of light-emitting units 552, 552A may be integrated by continuous light-reflecting members 546, 546A, respectively, to form a single light-emitting unit assembly 550, 550A. In this case as well, the light-emitting surfaces 552a, 552a' of the light-emitting units 552, 552A may be curved as shown in Figure 14A, or flat as shown in Figure 14B, so long as they are directed toward the corresponding irradiation region.
The light emitting portion assemblies 550 and 550A integrated in this manner improve the mounting accuracy. Also, since it is not necessary to mount the light emitting portions 552 and 552A individually, the number of steps in the manufacturing process is reduced.

Next, an example of a method for manufacturing the light emitting portion assembly 550 will be described with reference to FIGS. 6A to 6C and 15A to 15E.
(1) First, as shown in FIG. 6A, a plurality of light emitting elements 42 are prepared, each of which includes a semiconductor laminate 43 and an electrode 44 disposed on the lower surface of the semiconductor laminate 43.
(2) Next, as shown in FIG. 6B, the light emitting element 42 is placed on the support 60 with the upper surface 42a facing downward.
(3) Next, as shown in Fig. 6C, a first light reflective member 46a is disposed so as to cover the side surface of the light emitting element 42. At this time, if the bottom surface 44a of the electrode 44 is covered with the light reflective member 46a, the first light reflective member 46a is removed to expose the bottom surface 44a of the electrode 44. The first light reflective member 46a can be removed by, for example, cutting.
(4) Next, as shown in FIG. 15A, a wavelength conversion member 545 is disposed on the upper surface 42a of each light emitting element 42.
(5) Next, as shown in FIG. 15B, a light-transmitting member 547 is disposed on the wavelength conversion member 545.
(6) Next, as shown in FIG. 15C, a third light reflective member 46 c is disposed to cover the wavelength conversion member 545 and the light-transmitting member 547 .
(7) Next, as shown in Fig. 15D, the third light reflective member 46c and the light-transmitting member 547 are ground from the upper surface side of the third light reflective member 46c, and the upper surface of each light-transmitting member 547 is formed into a desired shape. This allows the upper surface of the light-transmitting member 547, that is, the light-emitting portion 552 whose light-emitting surface 552a is a desired shape to be formed. The light-emitting portion 52 whose light-emitting surface 552a is curved downward as shown in Fig. 15D is formed, for example, by grinding the light-transmitting member 547 while rotating a tool whose grinding side is spherical. Also, the light-emitting portion 552A whose light-emitting surface 552b is flat as shown in Fig. 14B is formed, for example, by grinding the light-transmitting member 547.
(8) Next, as shown in Fig. 15E, the first light reflective member 46a and the third light reflective member 46c are cut at a desired cutting surface CL. The first light reflective member 46a and the third light reflective member 46c constitute a light reflective member 546 (or a light reflective member 546A) that integrates a plurality of light emitting portions 552 (or light emitting portions 552A).
Through the above steps, a light emitting portion assembly 550 (or a light emitting portion assembly 550A) in which a plurality of light emitting portions 552 (or light emitting portions 552A) are integrated is manufactured.

Further, another example of a method for manufacturing the light emitting portion assembly 552 will be described with reference to FIGS. 6A to 6C and 16A to 16E.
(1) First, as shown in FIG. 6A, a plurality of light emitting elements 42 are prepared, each of which includes a semiconductor laminate 43 and an electrode 44 disposed on the lower surface of the semiconductor laminate 43.
(2) Next, as shown in FIG. 6B, the light emitting element 42 is placed on the support 60 with the upper surface 42a facing downward.
(3) Next, as shown in Fig. 6C, a first light reflective member 46a is disposed so as to cover the side surface of the light emitting element 42. At this time, if the bottom surface 44a of the electrode 44 is covered with the light reflective member 46a, the first light reflective member 46a is removed to expose the bottom surface 44a of the electrode 44. The first light reflective member 46a can be removed by, for example, cutting.
(4) Next, as shown in Fig. 16A, the support 60 is removed from the top surface of the light-emitting element 42, and a fourth light-reflective member 46d is placed to surround the entire top surface 42a of the light-emitting element 42. The fourth light-reflective member 46d functions as a frame material that determines the inclination angle of the light-emitting surface 52a of the target light-emitting section 52. Therefore, the height is appropriately adjusted along the entire circumference of the top surface 42a of the light-emitting element 42 according to the inclination angle.
16B, the wavelength conversion member 45 is potted onto the upper surface 42a of the light emitting element 42. The fourth light reflective member 46d also functions as a frame member at this time.
(6) Next, as shown in FIG. 16C, the mold 500 is placed on the fourth light reflective member 46d with a gap 600. The lower surface of the mold 500 is formed in a shape that matches the desired light emitting surface shape. For example, when forming a light emitting surface 552a' with a flat upper surface as shown in FIG. 14B, a mold 500 with a lower surface formed of a plurality of flat surfaces as shown in FIG. 16C is used. Also, when forming a light emitting surface 552a with a curved upper surface facing downward as shown in FIG. 14A, a mold with a lower surface formed of a plurality of curved surfaces facing downward is used. Also, the gap 600 is for pouring the light transmissive member 47, as described later. If the height of the gap 600, that is, the distance d3 between the upper surface of the fourth light reflective member 46d and the lower surface of the mold 500, is too large, the light of the light emitting portion 552A propagates through the gap 600, so it is preferable that it is, for example, greater than 0 μm and smaller than 100 μm.
(7) Next, as shown in FIG. 16D , the light-transmitting member 47 is poured into the gap 600 and disposed on the wavelength conversion member 45 .
(8) Next, as shown in Fig. 16E, the mold 500 is removed, and the first light reflective member 46a and the fourth light reflective member 46d are cut at the desired cutting plane CL. The first light reflective member 46a and the fourth light reflective member 46d constitute a light reflective member 546A (or a light reflective member 546) that integrates a plurality of light emitting portions 552A (or light emitting portions 552).
In addition, the light-transmitting member 47 may be formed by potting the wavelength conversion member 45 on the upper surface 42a of the light-emitting element 42 (see FIG. 16B ), potting the light-transmitting member 47 on the wavelength conversion member 45, and then placing a mold 500 on the light-transmitting member 47.
Through the above steps, a light emitting portion assembly 550A (or a light emitting portion assembly 550) in which a plurality of light emitting portions 552A (or light emitting portions 552) are integrated is manufactured.

In the above embodiment and modified example, the light emitting unit 52 is arranged in the order of the wavelength conversion member 45 and the translucent member 47 from the semiconductor laminate 43 side, but this is not limited thereto. For example, the light emitting member 47 and the wavelength conversion member 45 may be arranged in this order from the semiconductor laminate 43 side. In this case, the upper surface of the wavelength conversion member 45 becomes the light emitting surface 52a of the light emitting unit 52. In this case, the shape of the wavelength conversion member 45 may be appropriately adjusted so that the light emitting surface 52a is inclined with respect to the mounting surface 2a, or the shape of all or one or more of the semiconductor laminate 43, the translucent member 47, and the wavelength conversion member 45 may be appropriately adjusted so that the light emitting surface 52a is inclined with respect to the mounting surface 2a.

Example 1
In Example 1, based on the light source device 101 of embodiment 2, a light source device model including a substrate 2, four light-emitting units 52 that can be turned on independently, a first lens 110 including a unit first lens 111 provided corresponding to each light-emitting unit 52, and a frame 103 that covers the light-emitting units 52 and the first lens 110 and has an opening 104 on its upper surface was used to simulate the light distribution intensity that represents the spatial distribution of the intensity of light from a turned-on light-emitting unit 52 (hereinafter also referred to as a turned-on light-emitting unit 52), and the illuminance distribution in the irradiation area corresponding to the turned-on light-emitting unit 52.
The light-emitting section 52 _{includes, in this order from below, a light-emitting element 42 that emits blue light and has a sapphire substrate (refractive index n=1.77), a wavelength conversion member 45 made of a phenyl-based silicone resin (refractive index n=1.53) containing Y3(Al,Ga)5O12 : Ce} as a phosphor, and a light-transmitting member 47 made of a phenyl-based silicone resin (refractive index n=1.53), and the sides of the light-emitting element 42, the wavelength conversion member 45, and the light-transmitting member 47 are covered with a light-reflecting member 46 made of a phenyl-based silicone resin containing 60% by weight of titanium oxide. The light-emitting section 52 is 0.8 mm x 0.8 mm square in plan view, the portion excluding the light-reflecting member 46 is 0.5 mm x 0.5 mm square in plan view, and the minimum height of the light-reflecting member 46 of the light-emitting section 52 is 0.244 mm.
The light emitting sections 52 were set to be arranged in a matrix of two rows and two columns.
The light emitting portions 52 were set to be disposed with a distance of 2.2 mm between the center points of adjacent light emitting portions 52. The light emitting portions 52 were set to be disposed at an equal distance from the midpoint of the substrate 2. The shape of the substrate 2 as viewed from above was set to be a square.
All four light-emitting units 52 were set to the inclined light-emitting surface light-emitting unit 51. The distance between the light-emitting surface 52a of each light-emitting unit 52 and the mounting surface 2a was set to be shortest at the most central point side of the board 2 and longest at the most peripheral side of the board 2. In other words, the light-emitting surface 52a was set to be lowest at the most central point side of the board 2 and highest at the most peripheral side of the board 2. In addition, the distance between the light-emitting surface 52a of each light-emitting unit 52 and the mounting surface 2a was set to be longer from the midpoint side of the board 2 toward the peripheral side of the board 2. The inclination angle of the light-emitting surface 52a with respect to the mounting surface 2a was set to 20°, and each light-emitting unit 52 was set to face the direction of the corresponding irradiation area.
The irradiation areas were set to correspond to the four light-emitting units 52, and to be arranged in a matrix of two rows and two columns. The irradiation areas were set on a rectangular plane with short sides of 140 mm and long sides of 185 mm, taking into consideration the angle of view and aspect ratio of the camera, and the four irradiation areas were arranged adjacent to each other on the same plane. The irradiation areas corresponding to each light-emitting unit 52 were set to be arranged in a point-symmetric relationship with respect to a point located directly above the midpoint of the substrate 2.
The distance between the center of the area including the four irradiation areas corresponding to the four light emitting portions 52 and the midpoint of the substrate 2 was set to 300 mm.
The unit first lens 111 was a Fresnel lens for the purpose of collecting light. The refractive index of the unit first lens 111 was set to 1.59. The inclination angle of the upper surface 111c of each unit first lens 111 with respect to the mounting surface 2a of the substrate 2 was set to 35°, and the upper surface 111c of each unit first lens 111 was set to face the corresponding irradiation area. Air was arranged in the space where the unit first lenses 111 contact. The refractive index of air was set to 1. The convex portions of the unit first lenses 111 were set to be provided at intervals of 0.13 mm or more and 0.17 mm or less. The shape of the convex portions of the unit first lenses 111 was appropriately set in consideration of the above settings so that the light emitted from each light emitting unit 52 was collected in the corresponding irradiation area.
The opening 104 of the frame 103 in the top view was set to have a circular shape with a radius of 1.9 mm, centered at a central point located directly above the midpoint of the substrate 2 .

As shown in Fig. 19, Figs. 18A, 18C, 18E, 18G, 18I, 18K, and 18M are planes including the diagonals of the substrate 2 when viewed from above, and show relative intensity values obtained by dividing the light distribution intensity values of the light-emitting unit 52 in multiple light-emitting directions by the maximum light distribution intensity value of the light-emitting unit 52 on a diagonal cross section S1 perpendicular to the substrate 2. Note that in Fig. 19, to make the drawing easier to understand, only the light-emitting unit 52 and the substrate 2 are shown among the components of the light source model.

(Example 1-1)
In the light source model (light source model 1) in Example 1 produced as described above, the light emitting unit 52 in the first row and first column was turned on, and the relative intensity corresponding to the light emitting unit 52 with respect to the radiation intensity of light from the light emitting unit 52 and the illuminance distribution in the irradiation area of 4 were confirmed by simulation. Among the simulation results, the result of the relative intensity in a diagonal cross section S1 (see FIG. 19 ) that is a plane including a diagonal line of the substrate 2 in a top view and is perpendicular to the substrate 2 is shown in FIG. 18A. Among the simulation results, the result of the illuminance distribution in the irradiation area is shown in FIG. 18B.
The vertical axis of the graph shown in Fig. 18A indicates the relative intensity in the diagonal cross section S1. The horizontal axis of the graph shown in Fig. 18A indicates the light emission direction of the light-emitting section 52 in the first row and first column in the diagonal cross section S1 in angle (angle). Specifically, as shown in Fig. 19, in the diagonal cross section S1, the direction perpendicular to the substrate 2 from the light-emitting section 52 in the first row and first column is set to 0°, and the direction approaching the midpoint of the substrate 2 from the 0° position is represented by a negative angle, and the direction moving away from the midpoint of the substrate 2 from the 0° position is represented by a positive angle.
Hereinafter, the diagonal cross section S1 in Examples 1-2, 2, 3-1, 3-2, Reference Example 1, and Comparative Example 1 is expressed by the same definition as the diagonal cross section S1 in this Example 1-1.

From the results shown in FIG. 18A, when one light-emitting unit 52 is turned on in light source model 1, the angle indicating the light-emitting direction of the lit light-emitting unit 52 is -40°. Here, in the following examples, reference examples, and comparative examples including this example, the light-emitting direction refers to the angle at which the relative intensity is maximum.

(Example 1-2)
In the light source model 1 produced as described above, all four light-emitting units 52 were turned on to confirm the relative intensity of the radiation intensity of the light from the light-emitting units 52 and the illuminance distribution in the four irradiation regions. Among the simulation results, the results regarding the relative intensity are shown in Fig. 18C, and the results regarding the illuminance distribution are shown in Fig. 18D.
The vertical axis of the graph in Fig. 18C indicates the same thing as the vertical axis of the graph in Fig. 18A, and the horizontal axis of the graph in Fig. 18C indicates the same thing as the horizontal axis of the graph in Fig. 18A.
From the results shown in FIG. 18C, when the four light-emitting elements 52 were caused to emit light in the light source model 1, the angle indicating the light-emitting direction of the lit light-emitting elements 52 was ±25°.

Example 2
In the light source model in Example 2 (light source model 2), the number of light-emitting units 52 was one, and the upper surface of the light-emitting unit 52 was set parallel to the mounting surface 2a of the substrate 2. The light-emitting unit 52 was arranged so that the midpoint of the light-emitting unit 52 was located at the center of the substrate 2. In other words, the light-emitting unit 52 in Example 2 corresponded to the central light-emitting unit 50 of the light source device 101 according to the second embodiment.
Moreover, the corresponding illumination area was positioned directly above the midpoint of the light-emitting portion 52 .
Furthermore, the upper surface of the unit first lens 111 is set parallel to the mounting surface 2 a of the substrate 2 .
The light source model 2 does not include a frame 103 having an opening 104 on the upper surface.
The light source model 2 in the second embodiment was set to the same settings as the light source model 1 in the first embodiment except for the above settings.

In the light source model 2 produced as described above, the light emitting unit 52 was turned on to confirm the relative intensity of the radiation intensity of the light from the light emitting unit 52 and the illuminance distribution in the illuminated area. Among the simulation results, the results regarding the relative intensity are shown in FIG. 18E, and the results regarding the illuminance distribution are shown in FIG. 18F.
The vertical axis of the graph in Fig. 18E indicates the same thing as the vertical axis of the graph in Fig. 18A. The horizontal axis of the graph in Fig. 18E indicates the light emission direction of the light-emitting unit 52 in the diagonal cross section S1 as an angle, but since the light-emitting unit 52 is disposed on the center of the substrate 2, the positive and negative of the angle are defined as one direction away from the center of the substrate 2 being positive and the other direction being negative.
From the results shown in FIG. 18E, when the light-emitting unit 52 was caused to emit light in the light source model 2, the angle indicating the light-emitting direction of the lit light-emitting unit 52 was 0°.

The light source device 101 according to the second embodiment can be obtained by arranging the light emitting unit 52 in the second embodiment as the central light emitting unit 50 and arranging eight light emitting units 52 in the first embodiment as inclined light emitting units 51 around the central light emitting unit 50.

Example 3
The light source model (light source model 3) in Example 3 was set to be the same as the light source model 1 in Example 1, except that the four light-emitting parts 52 in Example 1 were used, with the upper surfaces of the four light-emitting parts 52 set parallel to the mounting surface 2a of the substrate 2.

(Example 3-1)
In the light source model 3 produced as described above, the light-emitting unit 52 in the first row and first column was turned on to measure the relative intensity corresponding to the light-emitting unit 52 with respect to the radiation intensity of light from the light-emitting unit 52, and the illuminance distribution in the irradiation area of 4. Among the simulation results, the results regarding the relative intensity are shown in Fig. 18G, and the results regarding the illuminance distribution are shown in Fig. 18H.
The vertical axis of the graph in Fig. 18G indicates the same thing as the vertical axis of the graph in Fig. 18A. The horizontal axis of the graph in Fig. 18G indicates the same thing as the horizontal axis of the graph in Fig. 18A.
Furthermore, from the results shown in FIG. 18G, when one light-emitting element 52 was caused to emit light in light source model 3, the angle indicating the light-emitting direction of the lit light-emitting element 52 was −30°.

(Example 3-2)
In the light source model 3 produced as described above, all four light-emitting units 52 were turned on to confirm the relative intensity with respect to the radiation intensity of light from the light-emitting units 52 and the illuminance distribution in the four irradiation regions. Among the simulation results, the results regarding the relative intensity are shown in FIG. 18I, and the results regarding the illuminance distribution are shown in FIG. 18J.
The vertical axis of the graph in Fig. 18I indicates the same thing as the vertical axis of the graph in Fig. 18A. The horizontal axis of the graph in Fig. 18I indicates the same thing as the horizontal axis of the graph in Fig. 18A.
From the results shown in FIG. 18I, when the four light-emitting elements 52 were caused to emit light in the light source model 3, the angle indicating the light-emitting direction of the lit light-emitting elements 52 was ±20°.

Reference Example 1
The light source model (light source model 4) in Reference Example 1 was set to be the same as the light source model 2 in Example 2, except that the first lens 110 was not provided in the light source model 2 in Example 2, the light emitting surface 52a of the light emitting unit 52 was inclined at 20° with respect to the mounting surface 2a of the substrate 2, and the light emitting surface 52a was set to face the direction of the corresponding irradiation area. In Reference Example 1, the frame 103 having the opening 104 on the upper surface was not provided.

In the light source model 4 produced as described above, the light emitting unit 52 was turned on to confirm the relative intensity corresponding to the light emitting unit 52 with respect to the radiation intensity of light from the light emitting unit 52, and the illuminance distribution in the irradiation area. Among the simulation results, the results regarding the relative intensity are shown in FIG. 18K, and the results regarding the illuminance distribution are shown in FIG. 18L.
The vertical axis of the graph in Fig. 18K represents the same as the vertical axis of the graph in Fig. 18A, and the horizontal axis of the graph in Fig. 18K represents the same as the horizontal axis of the graph in Fig. 18E.
From the results shown in FIG. 18K, when the light-emitting unit 52 in the light source model 4 was caused to emit light, the angle indicating the light-emitting direction of the lit light-emitting unit 52 was −38°.

Comparative Example 1
The light source model (light source model 5) in Comparative Example 1 was set to be the same as the light source model 4 in Reference Example 1, except that the light emitting surface 52a of the light emitting unit 52 in the light source model 4 in Reference Example 1 was parallel to the mounting surface 2a of the substrate 2. In Comparative Example 1, the frame 103 having the opening 104 on the upper surface was not provided.

In the light source model 5 produced as described above, the light emitting unit 52 was turned on to confirm the relative intensity corresponding to the light emitting unit 52 with respect to the radiation intensity of light from the light emitting unit 52, and the illuminance distribution in the illuminated area. Among the simulation results, the results regarding the relative intensity are shown in FIG. 18M, and the results regarding the illuminance distribution are shown in FIG. 18N.
The vertical axis of the graph in Fig. 18M is the same as that of the graph in Fig. 18A, and the horizontal axis of the graph in Fig. 18M is the same as that of the graph in Fig. 18E.
From the results shown in FIG. 18M, when the light-emitting unit 52 in the light source model 5 was caused to emit light, the angle indicating the light-emitting direction of the lit light-emitting unit 52 was ±5°.

The results of Reference Example 1 and Comparative Example 1 reveal that light source model 4 of Reference Example 1 can irradiate the irradiation area with the peak position of the irradiation distribution shifted from 0° more than light source model 5 of Comparative Example 1.

The results of Example 2 and Comparative Example 1 show that light source model 2 of Example 2 was able to illuminate the corresponding illumination area more selectively than light source model 5 of Comparative Example 1.
In other words, it was revealed that light source model 2 equipped with light-emitting unit 52 and first lens 110 can illuminate the corresponding illumination area more selectively than light source model 5 equipped with light-emitting unit 52 only.

The results of Example 1-1 and Example 3-1 revealed that when the total luminous flux emitted outside the frame body 3 by one lighting light-emitting unit 52 in Example 3-1 is taken as 100%, the total luminous flux emitted outside the frame body 3 by one lighting light-emitting unit 52 in Example 1-1 is improved by 38%.
In addition, from the results of Example 1-1 and Example 3-1, when the amount of light (lm) received in an area corresponding to a 75° angle of view of one light-emitting unit 52 in Example 3-1 is taken as 100%, it is clear that the amount of light (lm) received in an area corresponding to a 75° angle of view of one light-emitting unit 52 in Example 1-1 is improved by 14%. In the measurement of the total luminous flux in this example, the area corresponding to a 75° angle of view is an area of 280×370 mm installed at a location 300 mm away from the light-emitting unit 52 in the emission direction.
Therefore, it was revealed that the light source model 1 in Example 1-1 can illuminate the corresponding illumination area more selectively than the light source model 3 in Example 3-1.

The results of Examples 1-2 and 3-2 revealed that when the total luminous flux emitted outside the frame body 3 by the four lighting light-emitting units 52 of Example 3-2 is taken as 100%, the total luminous flux emitted outside the frame body 3 by the four lighting light-emitting units 52 of Example 1-2 is improved by 37%.
Furthermore, the results of Example 1-2 and Example 3-2 revealed that when the total amount of light (lm) received in an area equivalent to a field angle of 75° of each of the four light-emitting elements 52 in Example 3-2 is taken as 100%, the total amount of light (lm) received in an area equivalent to a field angle of 75° of each of the four light-emitting elements 52 in Example 1-2 is improved by 14%.
Therefore, it was revealed that the light source model 1 in Example 1-2 can illuminate the corresponding illumination area more selectively than the light source model 3 in Example 3-2.

The comparison results between Example 1-1 and Example 3-1, and the comparison results between Example 1-2 and Example 3-2 reveal that light source model 1, which has a light-emitting unit 52 with a tilted light-emitting surface 52a directed toward the corresponding irradiation area and a first lens 110 with a tilted upper surface directed toward the corresponding irradiation area, can more selectively illuminate the corresponding irradiation area than light source model 3, which has a light-emitting unit 52 with a light-emitting surface 52a not directed toward the corresponding irradiation area and a first lens 110 with a tilted upper surface directed toward the corresponding irradiation area.
From this result, it became clear that the light loss in light source model 3 was greater than the light loss in light source model 1. This is thought to be because, in light source model 3, the amount of light that does not illuminate the corresponding illumination region but illuminates frame body 103 etc. (in other words, heads toward frame body 103 etc.) is greater than the amount of light in light source model 1.
Furthermore, the above results reveal that the light loss in light source model 1 can be suppressed more than the light loss in light source model 3. This is thought to be because in light source model 1, light-emitting surface 52a of light-emitting unit 52 is inclined toward the corresponding irradiation area, and therefore the amount of light emitted from light-emitting unit 52 that irradiates the corresponding irradiation area is greater than the amount of light in light source model 3.

The results of Example 1, Example 2, Example 3, Reference Example 1, and Comparative Example 1 reveal that the light source model 1, which includes a light-emitting unit 52 with an inclined light-emitting surface 52a facing the corresponding irradiation area and a first lens 110 with an inclined upper surface facing the corresponding irradiation area, can most efficiently and selectively illuminate the corresponding irradiation area.

The light source device of the present invention can irradiate light to a desired irradiation area, and is therefore suitable for use in lighting, camera flashlights, vehicle headlights, etc. However, the light source device of the present invention is not limited to these applications.

Although the embodiments, modifications, and examples of the present disclosure have been described above, the disclosed contents may vary in the details of the configuration, and the combination and order of elements in the embodiments, modifications, and examples may be changed without departing from the scope and concept of the claimed disclosure.

1, 101, 201, 301, 401, 501 Light source device 2 Substrate 2a Mounting surface 3, 103 Frame body 4, 104 Opening 5 Support portion 10 Member assembly 12 Upper surface 13 Lower surface 14 Recess 14a Inner surface of recess 16 Connection portion 17 Inner side surface 30 Optical lens 31 First surface 32 Second surface 33, 33a Incident region 34, 34a Emitting region 36 First optical lens 37 Second optical lens 38 Third optical lens 42 Light emitting element 42a Upper surface 43 Semiconductor laminate 44 Electrode 44a Bottom surface 45 Wavelength conversion member 46 Light reflective member 46a First light reflective member 46b Second light reflective member 47 Light-transmitting member 50 Central light emitting portion 50a, 50a' Light emitting surface 51 Light emitting surface inclined light emitting portion 51a, 51a' Light-emitting surface 60 Support 70 Protective cover 110, 210, 210A, 310, 310A, 410A, 510 First lens 111, 211, 311, 411, 511 Unit first lens 552 Light-emitting portion 552a Light-emitting surface B1, C1, C2, C3 Optical axis O Point P Center points Q, S Vertex R1 Region R33, R35, R42 Irradiation region

Claims (33)

A light source device for irradiating light onto two or more illumination regions,
A plurality of light emitting units each having a light emitting surface on an upper surface thereof and provided on a mounting surface on the same plane so as to correspond to each of the illumination areas;
an optical means for irradiating light emitted from each of the light-emitting units onto an illumination area corresponding to the light-emitting unit;
Including,
the plurality of light-emitting units include an inclined light-emitting surface light-emitting unit whose light-emitting surface is inclined with respect to the mounting surface,
A light source device in which light emitting surfaces of the plurality of light emitting portions are directed toward corresponding illumination areas. The light source device according to claim 1 , wherein the light emitting surface of the inclined light emitting surface part is curved in a convex or concave shape. The light source device according to claim 1 , wherein each of the light emitting sections and the illumination area corresponding to the light emitting section are arranged in a point-symmetric relationship with respect to a point located on an optical axis of the light emitting section. The light source device according to claim 3 , wherein the one point corresponding to each of the plurality of light emitting portions is the same point. The light source device according to claim 4 , wherein when there are two or more inclined light-emitting surfaces arranged at equal distances from the one point, the angles at which the light-emitting surfaces of the inclined light-emitting surfaces of the inclined light-emitting surfaces are inclined relative to the mounting surface are the same. The light source device according to any one of claims 1 to 5, wherein the optical means is disposed above the plurality of light-emitting elements and includes an optical lens that focuses or projects the light emitted from each of the light-emitting elements onto an irradiation area corresponding to the light-emitting element . The light source device according to any one of claims 1 to 5 , wherein the optical means is disposed above the plurality of light-emitting elements and includes a first lens that narrows a full angle at half maximum of the light emitted from each of the light-emitting elements. The optical means is
a first lens disposed above the plurality of light-emitting units and narrowing a full angle at half maximum of light emitted from each of the light-emitting units;
an optical lens disposed above the first lens, for concentrating or projecting the light emitted from each of the light-emitting units onto an illumination region corresponding to the light-emitting unit;
The light source device according to any one of claims 1 to 5 , comprising: The optical means is
The light source device according to claim 1 , further comprising a first lens disposed above the plurality of light-emitting sections and configured to expand a full angle at half maximum of light emitted from each of the light-emitting sections. The light source device according to claim 7 , wherein the first lens includes a plurality of unit first lenses that correspond to the light emitting portions and are provided separately from one another. The light source device according to claim 7 , wherein the first lens includes a lens in which a plurality of unit first lenses corresponding to the respective light-emitting portions are connected to each other and integrated. The light source device according to claim 10 , wherein an optical axis of the unit first lens is perpendicular to a light emitting surface of the corresponding light emitting portion. The light source device according to claim 10 , wherein the unit first lens is a Fresnel lens or an internal total reflection lens. The optical lens has a first surface located on the light-emitting unit side and including a plurality of entrance areas corresponding to each of the light-emitting units and into which light emitted from the light-emitting units is incident, and a second surface located opposite the first surface and including a plurality of exit areas corresponding to each of the entrance areas.A light source device as described in any one of claims 6 , 8 , and claims 10 to 13 that cite claim 8 . The light source device according to claim 6 , claim 8 , or any one of claims 10 to 14 which cites claim 8 , wherein the optical lens is constituted by a plurality of lenses. The light source device according to claim 14 , wherein two adjacent entrance areas of the plurality of entrance areas of the optical lens partially overlap each other. The light source device according to claim 15 , wherein two adjacent light emission areas of the optical lens partially overlap each other. A light source device for irradiating light onto two or more illumination regions,
A plurality of light emitting units each having a light emitting surface on an upper surface thereof and provided on a mounting surface on the same plane so as to correspond to each of the illumination areas;
an optical means for irradiating light emitted from each of the light-emitting units onto an illumination area corresponding to the light-emitting unit;
Including,
the optical means is disposed above each of the plurality of light emitting units, and includes a Fresnel lens having a flat upper surface and an uneven lower surface;
A light source device in which an upper surface of the Fresnel lens is inclined with respect to the mounting surface and is directed toward a corresponding illumination area. The light source device according to claim 18 , wherein each of the light-emitting sections and the illumination area corresponding to the light-emitting section are arranged in a point-symmetric relationship with respect to a point located on an optical axis of the light-emitting section. The light source device according to claim 19 , wherein the one point corresponding to each of the plurality of light emitting portions is the same point. The light source device according to claim 20 , wherein when there are two or more Fresnel lenses arranged at positions equidistant from the one point, the angles at which upper surfaces of the Fresnel lenses are inclined with respect to the mounting surface are the same. the optical means includes an optical lens disposed above the plurality of light-emitting units and configured to focus or project light emitted from each of the light-emitting units onto an illumination region corresponding to the light-emitting unit;
The light source device according to claim 18 , wherein the Fresnel lens narrows a full angle at half maximum of the light emitted from each of the light emitting portions. The light source device according to claim 18 , wherein the Fresnel lens widens a full angle at half maximum of the light emitted from each of the light emitting portions. The light source device according to claim 18 , wherein the Fresnel lenses correspond to the light emitting portions and are provided separately from each other. The light source device according to claim 18 , wherein the Fresnel lenses are provided corresponding to the respective light emitting portions, and are connected to each other to be integrated. The optical lens has a first surface located on the light-emitting unit side and including a plurality of entrance areas corresponding to each of the light-emitting units and into which light emitted from the light-emitting units is incident, and a second surface located opposite the first surface and including a plurality of exit areas corresponding to each of the entrance areas. A light source device as described in claim 22 , and any one of claims 24 and 25 that cite claim 22 . The light source device according to claim 22 , and claim 24 or claim 25 which cites claim 22 , wherein the optical lens is composed of a plurality of lenses. 28. The light source device according to claim 26 , wherein two adjacent entrance areas of the plurality of entrance areas of the optical lens partially overlap each other. The light source device according to claim 26 , wherein two adjacent light emission areas of the optical lens partially overlap each other. the light emitting section includes a light emitting element and a light transmissive member located above the light emitting element,
The light source device according to any one of claims 1 to 29 , wherein the light emitting surface is an upper surface of the light-transmitting member. The light source device according to claim 30 , wherein the light emitting section has a wavelength conversion member between the light emitting element and the translucent member. The plurality of light emitting units are disposed on a substrate,
The light source device according to any one of claims 1 to 31 , wherein the mounting surface is an upper surface of the substrate. The light source device according to any one of claims 1 to 32 is a flashlight.

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