JP7790218B2 - Light-emitting module, light source device, and projector - Google Patents

Description

The present invention relates to a light-emitting module, a light source device, and a projector.

Patent Document 1 discloses a printed circuit board for a light source module that includes multiple light-emitting diodes and a printed circuit board. The wiring pattern of the printed circuit board is arranged so that the light-emitting diodes are divided into multiple series and connected in series. In other words, multiple series circuits containing multiple series-connected light-emitting diodes are configured on the printed circuit board, and these series circuits are connected in parallel.

JP 2011-091256 A

With the technology of Patent Document 1, if a temperature difference occurs between different series circuits, the current values flowing through the different series circuits will become uneven. This uneven current value can cause brightness variations between the different series circuits.

In order to solve the above problem, one embodiment of the light-emitting module of the present invention comprises a first element group including N (N is an integer of 2 or greater) first light-emitting elements, and a second element group including N second light-emitting elements, wherein the first element group and the second element group are alternately arranged along a first direction, the first light-emitting elements and the second light-emitting elements are aligned in a line along the first direction, the cathode electrode of the first light-emitting element and the anode electrode of the second light-emitting element are located on one side of a second direction intersecting the first direction, and the anode electrode of the first light-emitting element and the cathode electrode of the second light-emitting element are located on the other side of the second direction, and each of the first light-emitting elements included in the first element group is connected in series via a wiring pattern to a second light-emitting element included in the second element group adjacent to the first element group, the second light-emitting element being located in a position symmetrical with respect to an imaginary line, and the imaginary line is a straight line located between the adjacent first element group and second element group and extending in the second direction.

One embodiment of the light-emitting module of the present invention comprises a first element group including N (N is an integer of 2 or greater) first light-emitting elements, a second element group including N (N is an integer of 2 or greater) second light-emitting elements, and a wiring pattern connecting the first element group and the second element group, wherein the N first light-emitting elements include first elements and second elements, and the N second light-emitting elements include third elements and fourth elements, the first element group and the second element group are arranged side by side along a first direction, and the first elements, the second elements, the third elements, and the fourth elements are arranged in order toward the first direction, and the front The cathode electrode of the first light-emitting element and the anode electrode of the second light-emitting element are positioned in a second direction intersecting the first direction, the anode electrode of the first light-emitting element and the cathode electrode of the second light-emitting element are positioned in a third direction opposite to the second direction, the wiring pattern has a first wiring pattern and a second wiring pattern, the first element and the fourth element are connected by the first wiring pattern to form a first series circuit, and the second element and the third element are connected by the second wiring pattern to form a second series circuit.

A light source device according to one aspect of the present invention comprises the light-emitting module according to the above aspect and a wavelength conversion member that contains a phosphor and converts first light emitted from the light-emitting module into second light having a wavelength band different from the wavelength band of the first light.

A projector according to one aspect of the present invention includes the light source device according to the above aspect, a light modulation device that modulates the light emitted from the light source device, including the second light, in accordance with image information, and a projection optical device that projects the light modulated by the light modulation device.

FIG. 1 is a schematic configuration diagram of a projector according to an embodiment of the present invention. FIG. 2 is a schematic diagram illustrating the configuration of a first lighting device including the light source device of the present embodiment. FIG. 2 is a diagram illustrating an example of a circuit configuration of the light-emitting module according to the present embodiment. FIG. 10 is a diagram showing a first modified example of the circuit configuration of the light emitting module of the present embodiment. FIG. 10 is a diagram showing a second modified example of the circuit configuration of the light emitting module of the present embodiment. FIG. 10 is a diagram showing a third modified example of the circuit configuration of the light emitting module of the present embodiment.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
The projector of this embodiment is an example of a projector that uses a liquid crystal panel as a light modulation device.
In the drawings below, the dimensions of some components may be shown on different scales to make them easier to see.

FIG. 1 is a diagram showing a schematic configuration of a projector 1 according to this embodiment.
1, the projector 1 of this embodiment is a projection-type image display device that displays a color image on a screen (projection surface) SCR. The projector 1 includes three light modulation devices corresponding to red light LR, green light LG, and blue light LB.

The projector 1 includes a first lighting device 20, a second lighting device 21, a color separation optical system 3, a light modulation device 4R, a light modulation device 4G, a light modulation device 4B, a light combining element 5, and a projection optical device 6.

The first lighting device 20 emits yellow fluorescence Y toward the color separation optical system 3. The second lighting device 21 emits blue light LB toward the light modulation device 4B. The detailed configurations of the first lighting device 20 and the second lighting device 21 will be described later.

In the following drawings, an XYZ Cartesian coordinate system will be used as necessary for explanation. The Z axis is an axis along the vertical direction of the projector 1. The X axis is an axis parallel to the optical axis AX1 of the first lighting device 20 and the optical axis AX2 of the second lighting device 21. The Y axis is an axis perpendicular to the X and Z axes. The optical axis AX1 of the first lighting device 20 is the central axis of the fluorescent light Y emitted from the first lighting device 20. The optical axis AX2 of the second lighting device 21 is the central axis of the blue light LB emitted from the second lighting device 21.

The color separation optical system 3 separates the yellow fluorescence Y emitted from the first lighting device 20 into red light LR and green light LG. The color separation optical system 3 includes a dichroic mirror 7, a first reflecting mirror 8a, and a second reflecting mirror 8b.

The dichroic mirror 7 separates the fluorescence Y into red light LR and green light LG. The dichroic mirror 7 transmits the red light LR and reflects the green light LG. The second reflecting mirror 8b is positioned in the optical path of the green light LG. The second reflecting mirror 8b reflects the green light LG reflected by the dichroic mirror 7 toward the light modulation device 4G. The first reflecting mirror 8a is positioned in the optical path of the red light LR. The first reflecting mirror 8a reflects the red light LR that has transmitted through the dichroic mirror 7 toward the light modulation device 4R.

On the other hand, the blue light LB emitted from the second lighting device 21 is reflected by the reflecting mirror 9 toward the light modulation device 4B.

The configuration of the second illumination device 21 will be described below.
The second illumination device 21 includes a light source unit 81, a condenser lens 82, a diffuser plate 86, a rod lens 84, and a relay lens 85. The light source unit 81 is configured with at least one semiconductor laser. The light source unit 81 emits blue light LB formed from laser light. Note that the light source unit 81 is not limited to a semiconductor laser, and may be configured with a light emitting diode (LED) that emits blue light.

The condenser lens 82 is composed of a convex lens. The condenser lens 82 causes the blue light LB emitted from the light source unit 81 to enter the diffuser plate 86 in a substantially condensed state. The diffuser plate 86 diffuses the blue light LB emitted from the condenser lens 82 with a predetermined degree of diffusion, generating blue light LB with a substantially uniform light distribution similar to that of the fluorescent light Y emitted from the first lighting device 20. The diffuser plate 86 is made of, for example, frosted glass made of optical glass.

The blue light LB diffused by the diffuser plate 86 is incident on the rod lens 84. The rod lens 84 has a rectangular columnar shape extending along the optical axis AX2 of the second lighting device 21. The rod lens 84 has a light incident end surface 84a at one end and a light exit end surface 84b at the other end. The diffuser plate 86 is fixed to the light incident end surface 84a of the rod lens 84 via optical adhesive (not shown). It is desirable to match the refractive index of the diffuser plate 86 and the refractive index of the rod lens 84 as closely as possible.

Blue light LB propagates through the rod lens 84 while undergoing total reflection, and is emitted from the light-emitting end surface 84b with an increased uniformity in illuminance distribution. The blue light LB emitted from the rod lens 84 is incident on the relay lens 85. The relay lens 85 causes the blue light LB, whose uniformity in illuminance distribution has been increased by the rod lens 84, to be incident on the reflecting mirror 9.

The shape of the light-emitting end surface 84b of the rod lens 84 is rectangular, roughly similar to the shape of the image forming area of the light modulation device 4B. This allows the blue light LB emitted from the rod lens 84 to efficiently enter the image forming area of the light modulation device 4B.

Light modulation device 4R modulates red light LR according to image information to form image light corresponding to the red light LR. Light modulation device 4G modulates green light LG according to image information to form image light corresponding to the green light LG. Light modulation device 4B modulates blue light LB according to image information to form image light corresponding to the blue light LB.

Each of the optical modulation devices 4R, 4G, and 4B uses, for example, a transmissive liquid crystal panel. Furthermore, polarizing plates (not shown) are disposed on the entrance and exit sides of the liquid crystal panels. The polarizing plates only allow linearly polarized light in a specific direction to pass through.

A field lens 10R is disposed on the incident side of the light modulation device 4R. A field lens 10G is disposed on the incident side of the light modulation device 4G. A field lens 10B is disposed on the incident side of the light modulation device 4B. The field lens 10R collimates the chief ray of the red light LR incident on the light modulation device 4R. The field lens 10G collimates the chief ray of the green light LG incident on the light modulation device 4G. The field lens 10B collimates the chief ray of the blue light LB incident on the light modulation device 4B.

The light combining element 5 receives the image light emitted from the light modulation device 4R, the light modulation device 4G, and the light modulation device 4B, combines the image light corresponding to the red light LR, the green light LG, and the blue light LB, and emits the combined image light toward the projection optical device 6. The light combining element 5 may be, for example, a cross dichroic prism.

The projection optical device 6 is composed of multiple projection lenses. The projection optical device 6 enlarges and projects the image light combined by the light combining element 5 onto the screen SCR. This causes the image to be displayed on the screen SCR.

The configuration of the first illumination device 20 will be described below.
FIG. 2 is a schematic diagram of the first illumination device 20. As shown in FIG.
As shown in FIG. 2 , the first illumination device 20 includes a light source device 100 , an integrator optical system 70 , a polarization conversion element 102 , and a superimposing optical system 103 .

The light source device 100 includes a wavelength conversion member 50, a light-emitting module 51, a reflecting member 53, an angle conversion member 52, and an adhesive 59. The light-emitting module 51 includes a substrate 55 and a light-emitting element 56.

The wavelength conversion member 50 has a rectangular prism shape extending in the X-axis direction and has six faces. The sides of the wavelength conversion member 50 extending in the X-axis direction are longer than the sides extending in the Y-axis direction and the Z-axis direction. Therefore, the X-axis direction corresponds to the longitudinal direction of the wavelength conversion member 50. The lengths of the sides extending in the Y-axis direction and the Z-axis direction are equal. In other words, the cross-sectional shape of the wavelength conversion member 50 cut along a plane perpendicular to the X-axis direction is a square. However, the cross-sectional shape of the wavelength conversion member 50 cut along a plane perpendicular to the X-axis direction may also be rectangular.

The wavelength conversion member 50 has a first end face 50a that intersects the longitudinal direction (X-axis direction) of the wavelength conversion member 50 and emits fluorescence Y (described below); a second end face 50b that intersects the longitudinal direction (X-axis direction) of the wavelength conversion member 50 and is located opposite the first end face 50a; a first side face 50c and a second side face 50d that intersect the first end face 50a and the second end face 50b and are located opposite each other; and a third side face and a fourth side face (not shown) that intersect the first side face 50c and the second side face 50d and are located opposite each other. In the following description, the four faces, the first side face 50c, the second side face 50d, the third side face, and the fourth side face, are collectively referred to as side face 50g.

Note that the wavelength conversion member 50 does not necessarily have to have a rectangular prism shape, and may have a triangular prism shape or a cylindrical shape, for example. When the wavelength conversion member 50 has a triangular prism shape, the three faces intersecting the first end face and the second end face together form the side face 50g. When the wavelength conversion member 50 has a cylindrical shape, the single continuous curved face intersecting the first end face and the second end face forms the side face 50g.

The wavelength conversion member 50 contains at least a phosphor and converts excitation light E having a first wavelength band into fluorescence Y having a second wavelength band different from the first wavelength band. In this embodiment, the excitation light E enters the wavelength conversion member 50 from each of the first side surface 50c and the second side surface 50d. The fluorescence Y is guided inside the wavelength conversion member 50 and then emitted from the first end surface 50a. The excitation light E in this embodiment corresponds to the first light in the claims. The fluorescence Y in this embodiment corresponds to the second light in the claims.

The wavelength conversion member 50 contains a ceramic phosphor made of a polycrystalline phosphor that converts the wavelength of the excitation light E into fluorescent light Y. The second wavelength band of the fluorescent light Y is, for example, a yellow wavelength band of 490 to 750 nm. In other words, the fluorescent light Y is yellow fluorescence containing red and green light components.

The wavelength conversion member 50 may contain a single crystal phosphor instead of a polycrystalline phosphor. Alternatively, the wavelength conversion member 50 may be made of fluorescent glass. Alternatively, the wavelength conversion member 50 may be made of a material in which a large number of phosphor particles are dispersed in a binder made of glass or resin. A wavelength conversion member 50 made of such a material converts the excitation light E into fluorescence Y having the second wavelength band.

Specifically, the material of the wavelength conversion member 50 includes, for example, an yttrium aluminum garnet (YAG) phosphor. Taking YAG:Ce containing cerium (Ce) as an activator as an example, the material of the wavelength conversion member 50 may be a material obtained by mixing raw material powders containing constituent elements such as Y ₂ O ₃ , Al ₂ O ₃ , and CeO ₃ and causing a solid-phase reaction; Y-Al-O amorphous particles obtained by a wet method such as a coprecipitation method or a sol-gel method; or YAG particles obtained by a gas-phase method such as a spray-drying method, a flame pyrolysis method, or a thermal plasma method.

The light-emitting module 51 includes a plurality of light-emitting elements 56 having light-emitting surfaces 56a that emit excitation light E in a first wavelength band, and a substrate 55 on which the light-emitting elements 56 are mounted. The light-emitting modules 51 are provided facing each of the first side surface 50c and the second side surface 50d of the wavelength conversion member 50. The light-emitting elements 56 are, for example, light-emitting diodes (LEDs), but are not limited to this and may also be semiconductor lasers. In this way, the light-emitting modules 51 are provided facing a portion of the side surface 50g along the longitudinal direction of the wavelength conversion member 50. The number and arrangement of the light-emitting modules 51 are not particularly limited.

The light-emitting surface 56a of the light-emitting element 56 is positioned opposite the first side surface 50c and the second side surface 50d of the wavelength conversion member 50, and emits excitation light E toward the first side surface 50c and the second side surface 50d. The first wavelength band is, for example, a wavelength band from blue to violet, between 400 nm and 480 nm, with a peak wavelength of, for example, 445 nm.

The substrate 55 supports the light-emitting elements 56. A plurality of light-emitting elements 56 are arranged on one surface 55a of the substrate 55. In this embodiment, the light-emitting module 51 is composed of the light-emitting elements 56 and the substrate 55, but may also include other optical components such as a light guide plate, a diffuser plate, and a lens. Furthermore, there is no particular limit to the number of light-emitting elements 56 provided on the substrate 55. The circuit configuration of the light-emitting module 51 will be described later.

The reflecting member 53 is disposed opposite the second end face 50b of the wavelength conversion member 50. The reflecting member 53 guides light inside the wavelength conversion member 50 and reflects the fluorescence Y that reaches the second end face 50b. The reflecting member 53 is a separate member from the wavelength conversion member 50 and is composed of a plate-shaped member made of a metal material such as aluminum. The reflecting member 53 faces the second end face 50b of the wavelength conversion member 50 and has a reflecting surface 53r that reflects the fluorescence Y. The reflecting surface 53r may be the surface of the metal material itself, or may be composed of a metal film or a dielectric multilayer film formed on the surface of the metal material.

In the light source device 100, when excitation light E emitted from the light-emitting element 56 enters the wavelength conversion member 50, the phosphor contained within the wavelength conversion member 50 is excited, and fluorescence Y is emitted from any light-emitting point. Fluorescence Y travels in all directions from any light-emitting point, but fluorescence Y traveling toward the side surface 50g travels toward the first end surface 50a or the second end surface 50b while repeatedly undergoing total reflection at multiple points on the side surface 50g. Fluorescence Y traveling toward the first end surface 50a enters the angle conversion member 52. On the other hand, fluorescence Y traveling toward the second end surface 50b is reflected by the reflecting member 53 and travels toward the first end surface 50a.

Of the excitation light E incident on the wavelength conversion member 50, a portion of the excitation light E that is not used to excite the phosphor is reflected by the surrounding members of the wavelength conversion member 50, including the light-emitting element 56 of the light-emitting module 51, or by the reflecting member 53 provided on the second end surface 50b. As a result, a portion of the excitation light E is trapped inside the wavelength conversion member 50 and reused.

The angle conversion member 52 is provided on the light emission side of the first end surface 50a of the wavelength conversion member 50. The angle conversion member 52 is composed of, for example, a tapered rod. The angle conversion member 52 has a light incident surface 52a onto which the fluorescence Y emitted from the wavelength conversion member 50 is incident, a light emission surface 52b from which the fluorescence Y exits, and a side surface 52c that reflects the fluorescence Y toward the light emission surface 52b.

The angle conversion member 52 has a truncated quadrangular pyramid shape, and its cross-sectional area perpendicular to the optical axis J expands along the direction of light travel. Therefore, the area of the light exit surface 52b is larger than the area of the light incident surface 52a. The optical axis J of the angle conversion member 52 is an axis that passes through the centers of the light exit surface 52b and the light incident surface 52a and is parallel to the X-axis. The optical axis J of the angle conversion member 52 coincides with the optical axis AX1 of the first lighting device 20.

As the fluorescence Y incident on the angle conversion member 52 travels inside the angle conversion member 52, it changes direction each time it is totally reflected by the side surface 52c, approaching a direction parallel to the optical axis J. In this way, the angle conversion member 52 converts the emission angle distribution of the fluorescence Y emitted from the first end surface 50a of the wavelength conversion member 50. Specifically, the angle conversion member 52 makes the maximum emission angle of the fluorescence Y on the light emission surface 52b smaller than the maximum incidence angle of the fluorescence Y on the light incidence surface 52a.

Generally, the etendue of light, defined as the product of the area of the light exit region and the solid angle (maximum exit angle) of light, is preserved, and therefore the etendue of fluorescence Y is preserved both before and after passing through the angle conversion member 52. As described above, the angle conversion member 52 of this embodiment has a configuration in which the area of the light exit surface 52b is larger than the area of the light incident surface 52a. Therefore, from the perspective of etendue preservation, the angle conversion member 52 of this embodiment can set the maximum exit angle of fluorescence Y on the light exit surface 52b to an angle that is smaller than the maximum incident angle of fluorescence Y incident on the light incident surface 52a.

The angle conversion member 52 is fixed to the wavelength conversion member 50 via adhesive 59 so that the light incident surface 52a faces the first end face 50a of the wavelength conversion member 50. In other words, the adhesive 59 is provided between the angle conversion member 52 and the first end face 50a of the wavelength conversion member 50.

Instead of a tapered rod, a compound parabolic concentrator (CPC) may be used as the angle conversion member 52. Even when a CPC is used as the angle conversion member 52, the same effects as when a tapered rod is used can be obtained. Note that the light source device 100 does not necessarily have to include the angle conversion member 52.

The integrator optical system 70 has a first lens array 61, a second lens array 101, and a relay lens 104. Together with the superimposing optical system 103, the integrator optical system 70 constitutes a uniform illumination optical system that homogenizes the intensity distribution of the fluorescence Y emitted from the light source device 100 in each of the light modulation devices 4R and 4G, which are the illuminated areas. The fluorescence Y emitted from the light emission surface 52b of the angle conversion member 52 is incident on the first lens array 61.

The first lens array 61 has a plurality of first small lenses 61a. The plurality of first small lenses 61a are arranged in a matrix in a plane parallel to the YZ plane, which is perpendicular to the optical axis AX1 of the first lighting device 20. The plurality of first small lenses 61a split the fluorescence Y emitted from the angle conversion member 52 into a plurality of partial beams. The shape of each of the first small lenses 61a is rectangular, roughly similar to the shape of the image formation areas of the light modulation devices 4R and 4G. This allows each of the partial beams emitted from the first lens array 61 to efficiently enter the image formation areas of the light modulation devices 4R and 4G, respectively.

Fluorescence Y emitted from the first lens array 61 travels toward the second lens array 101 via the relay lens 104. The second lens array 101 is disposed opposite the first lens array 61. The second lens array 101 has a plurality of second small lenses 101a corresponding to the plurality of first small lenses 61a of the first lens array 61. The second lens array 101, together with the superimposing optical system 103, forms each of the images of the plurality of first small lenses 61a of the first lens array 61 near the image formation areas of the light modulation devices 4R and 4G. The plurality of second small lenses 101a are arranged in a matrix in a plane parallel to the YZ plane, which is perpendicular to the optical axis AX1 of the first illumination device 20.

In this embodiment, each first small lens 61a of the first lens array 61 and each second small lens 101a of the second lens array 101 have the same size, but they may also have different sizes. Also, in this embodiment, the first small lenses 61a of the first lens array 61 and the second small lenses 101a of the second lens array 101 are arranged so that their optical axes coincide, but they may also be arranged eccentrically.

The polarization conversion element 102 converts the polarization direction of the fluorescence Y emitted from the second lens array 101. Specifically, the polarization conversion element 102 converts each partial light beam of the fluorescence Y split by the first lens array 61 and emitted from the second lens array 101 into linearly polarized light.

The polarization conversion element 102 has a polarization separation layer (not shown) that transmits one linearly polarized component of the polarization components contained in the fluorescence Y emitted from the light source device 100 as is and reflects the other linearly polarized component in a direction perpendicular to the optical axis AX1, a reflection layer (not shown) that reflects the other linearly polarized component reflected by the polarization separation layer in a direction parallel to the optical axis AX1, and a phase difference plate (not shown) that converts the other linearly polarized component reflected by the reflection layer into one linearly polarized component.

The circuit configuration of the light-emitting module 51 will be described below.
FIG. 3 is a diagram showing an example of the circuit configuration of the light-emitting module 51.
The light-emitting module 51 of this embodiment includes a first element group GA including N (N is an integer of 2 or greater) light-emitting elements 56, a second element group GB including N (N is an integer of 2 or greater) light-emitting elements 56, and a substrate 55 on which the first element group GA and the second element group GB are arranged. The first element group GA and the second element group GB are arranged on the component mounting surface of the substrate 55.

In the following, the light-emitting elements 56 included in the first element group GA may be referred to as the first light-emitting elements 56A, and the light-emitting elements 56 included in the second element group GB may be referred to as the second light-emitting elements 56B. When there is no need to distinguish between the first light-emitting elements 56A and the second light-emitting elements 56B, the first light-emitting elements 56A and the second light-emitting elements 56B will be collectively referred to as the light-emitting elements 56.

As an example, Figure 3 shows two first element groups GA and two second element groups GB. Hereinafter, one of the two first element groups GA may be referred to as the first element group GA1, and the other as the first element group GA2. When there is no need to distinguish between the first element group GA1 and the first element group GA2, the first element group GA1 and the first element group GA2 will be collectively referred to as the first element group GA.

Furthermore, in the following, one of the two second element groups GB may be referred to as second element group GB1, and the other as second element group GB2. When there is no need to distinguish between second element group GB1 and second element group GB2, second element group GB1 and second element group GB2 will be collectively referred to as second element group GB.

In the example shown in FIG. 3, the first element group GA includes two first light-emitting elements 56A, and the second element group GB also includes two second light-emitting elements 56B. Specifically, the first element group GA1 includes first light-emitting elements 56A1 (first element) and 56A2 (second element), and the first element group GA2 includes first light-emitting elements 56A3 (fifth element) and 56A4 (sixth element). The second element group GB1 includes second light-emitting elements 56B1 (third element) and 56B2 (fourth element), and the second element group GB2 includes second light-emitting elements 56B3 (seventh element) and 56B4 (eighth element).

As shown in FIG. 3, on the component mounting surface of the substrate 55, the first element group GA and the second element group GB are alternately arranged along the X-axis direction. The X-axis direction corresponds to the "first direction" described in the claims. In the example shown in FIG. 3, the first element group GA and the second element group GB are alternately arranged in the order of first element group GA1, second element group GB1, first element group GA2, and second element group GB1, from the negative side to the positive side of the X-axis direction.

As shown in FIG. 3, on the component mounting surface of the substrate 55, the first light-emitting element 56A included in the first element group GA and the second light-emitting element 56B included in the second element group GB are aligned in a row along the X-axis direction. In the example shown in FIG. 3, eight light-emitting elements 56 are aligned in a row from the negative side to the positive side of the X-axis direction in the following order: first light-emitting element 56A1 (first element), first light-emitting element 56A2 (second element), second light-emitting element 56B1 (third element), second light-emitting element 56B2 (fourth element), first light-emitting element 56A3 (fifth element), first light-emitting element 56A4 (sixth element), second light-emitting element 56B3 (seventh element), and second light-emitting element 56B4 (eighth element).

As already mentioned, the light-emitting element 56 has a light-emitting surface 56a that emits excitation light E. Furthermore, the light-emitting element 56 has an anode electrode 56b provided on the same surface as the light-emitting surface 56a, and a cathode electrode 56c provided on the back surface opposite the light-emitting surface 56a.

The cathode electrode 56c of the first light-emitting element 56A included in the first element group GA and the anode electrode 56b of the second light-emitting element 56B included in the second element group GB are located on the negative side of the Z-axis direction. The Z-axis direction corresponds to the "second direction intersecting with the first direction" described in the claims. The negative side of the Z-axis direction corresponds to "one side of the second direction" described in the claims. Note that "intersecting with the first direction" means intersecting with the first direction within the same plane. Furthermore, "intersecting with the first direction" is not limited to intersecting at a right angle to the first direction.

The anode electrode 56b of the first light-emitting element 56A included in the first element group GA and the cathode electrode 56c of the second light-emitting element 56B included in the second element group GB are located on the positive side in the Z-axis direction. The positive side in the Z-axis direction corresponds to the "other side of the second direction" and the "third direction opposite the second direction" described in the claims.

Each of the first light-emitting elements 56A included in the first element group GA is connected in series via a wiring pattern to a second light-emitting element 56B included in the second element group GB adjacent to the first element group GA, the second light-emitting element 56B being located at a position symmetrical with respect to the imaginary line. Here, the imaginary line is a straight line located between the adjacent first element group GA and second element group GB and extending in the Z-axis direction. The wiring pattern is disposed on the same surface of the substrate 55. In other words, the wiring pattern is disposed on the component mounting surface on which the light-emitting elements 56 are mounted. Furthermore, the wiring pattern preferably has high electrical and thermal conductivity, and contains, for example, copper.

In the example shown in FIG. 3, the first element group GA1 and the second element group GB1 are adjacent to each other in the X-axis direction. Therefore, each of the first light-emitting elements 56A included in the first element group GA1 is connected in series with the second light-emitting element 56B included in the second element group GB1 that is positioned symmetrically with respect to the imaginary line VL1. The imaginary line VL1 is a straight line that is located between the first element group GA1 and the second element group GB1 and extends in the Z-axis direction.

Specifically, the first light-emitting element 56A1 included in the first element group GA1 is connected in series with the second light-emitting element 56B2 included in the second element group GB1, which is located in a line-symmetrical position with respect to the imaginary line VL1 as the axis of symmetry. Furthermore, the first light-emitting element 56A2 included in the first element group GA1 is connected in series with the second light-emitting element 56B1 included in the second element group GB1, which is located in a line-symmetrical position with respect to the imaginary line VL1 as the axis of symmetry.

In the example shown in FIG. 3, the first element group GA2 and the second element group GB1 are adjacent to each other in the X-axis direction. Therefore, each of the first light-emitting elements 56A included in the first element group GA2 is connected in series with one of the second light-emitting elements 56B included in the second element group GB1 that is located symmetrically with respect to the imaginary line VL2. The imaginary line VL2 is a straight line that is located between the first element group GA2 and the second element group GB1 and extends in the Z-axis direction.

Specifically, the first light-emitting element 56A3 included in the first element group GA2 is connected in series with the second light-emitting element 56B2 included in the second element group GB1, which is located in a line-symmetrical position with respect to the imaginary line VL2. Furthermore, the first light-emitting element 56A4 included in the first element group GA2 is connected in series with the second light-emitting element 56B1 included in the second element group GB1, which is located in a line-symmetrical position with respect to the imaginary line VL2.

In the example shown in FIG. 3, the first element group GA2 and the second element group GB2 are adjacent to each other in the X-axis direction. Therefore, each of the first light-emitting elements 56A included in the first element group GA2 is connected in series with one of the second light-emitting elements 56B included in the second element group GB2 that is located symmetrically with respect to the imaginary line VL3. The imaginary line VL3 is a straight line that is located between the first element group GA2 and the second element group GB2 and extends in the Z-axis direction.

Specifically, the first light-emitting element 56A3 included in the first element group GA2 is connected in series with the second light-emitting element 56B4 of the second light-emitting element 56B included in the second element group GB2, which is located in a line-symmetrical position with respect to the imaginary line VL3. Furthermore, the first light-emitting element 56A4 included in the first element group GA2 is connected in series with the second light-emitting element 56B3 of the second light-emitting element 56B included in the second element group GB2, which is located in a line-symmetrical position with respect to the imaginary line VL3.

As shown in FIG. 3, the wiring pattern includes two first wiring patterns P10 and P20 that individually connect in series the cathode electrode 56c of the first light-emitting element 56A included in the first element group GA1 located on the negative side in the X-axis direction of the first element group GA located on both sides of the second element group GB1, and the anode electrode 56b of the second light-emitting element 56B included in the second element group GB1. Hereinafter, the negative side in the X-axis direction may be referred to as the left side.

The first wiring pattern P10 connects in series the cathode electrode 56c of the first light-emitting element 56A1 included in the first element group GA1 and the anode electrode 56b of the second light-emitting element 56B2 included in the second element group GB1. The first wiring pattern P20 connects in series the cathode electrode 56c of the first light-emitting element 56A2 included in the first element group GA1 and the anode electrode 56b of the second light-emitting element 56B1 included in the second element group GB1.

The first wiring pattern P10 includes a first cathode wiring pattern P11, a first anode wiring pattern P12, and a first connection pattern P13. The first cathode wiring pattern P11 is connected to the cathode electrode 56c of the first light-emitting element 56A1 included in the first element group GA1 and is a wiring pattern that extends to the negative side in the Z-axis direction. As described above, the cathode electrode 56c is provided on the back surface of each light-emitting element 56, and therefore the cathode electrode 56c of the first light-emitting element 56A1 is connected to the first cathode wiring pattern P11 by a die-bonding material or the like.

The first anode wiring pattern P12 is connected to the anode electrode 56b of the second light-emitting element 56B2 included in the second element group GB1 and is a wiring pattern that extends to the negative side in the Z-axis direction. As described above, the anode electrode 56b is provided on the surface of each light-emitting element 56, and therefore the anode electrode 56b of the second light-emitting element 56B2 is connected to the first anode wiring pattern P12 by wire bonding or the like. The first connection pattern P13 is a wiring pattern that connects the first cathode wiring pattern P11 and the first anode wiring pattern P12 and extends in the X-axis direction.

The first wiring pattern P20 includes a first cathode wiring pattern P21, a first anode wiring pattern P22, and a first connection pattern P23. The first cathode wiring pattern P21 is connected to the cathode electrode 56c of the first light-emitting element 56A2 included in the first element group GA1 and is a wiring pattern that extends to the negative side in the Z-axis direction. Similar to the first light-emitting element 56A1, the cathode electrode 56c of the first light-emitting element 56A2 is connected to the first cathode wiring pattern P21 by a die-bonding material or the like.

The first anode wiring pattern P22 is connected to the anode electrode 56b of the second light-emitting element 56B1 included in the second element group GB1 and is a wiring pattern that extends to the negative side in the Z-axis direction. Similar to the second light-emitting element 56B2, the anode electrode 56b of the second light-emitting element 56B1 is connected to the first anode wiring pattern P22 by wire bonding or the like. The first connection pattern P23 is a wiring pattern that connects the first cathode wiring pattern P21 and the first anode wiring pattern P22 and extends in the X-axis direction.

In the example shown in FIG. 3, the width of the first cathode wiring pattern P11 is the same as the width of the first anode wiring pattern P12. Similarly, the width of the first cathode wiring pattern P21 is the same as the width of the first anode wiring pattern P22. The length of the first cathode wiring pattern P21 is shorter than the length of the first cathode wiring pattern P11. Similarly, the length of the first anode wiring pattern P22 is shorter than the length of the first anode wiring pattern P12. The length of the first connection pattern P23 is shorter than the length of the first connection pattern P13.

As described above, the length of the first wiring pattern P10, which connects the first light-emitting element 56A1 and the second light-emitting element 56B2 in series, is longer than the length of the first wiring pattern P20, which connects the first light-emitting element 56A2 and the second light-emitting element 56B1 in series. The first wiring pattern P10 is arranged to surround the first wiring pattern P20.

As shown in FIG. 3, the wiring pattern includes two second wiring patterns P30 and P40 that individually connect in series the anode electrode 56b of the first light-emitting element 56A included in the first element group GA2 located on the positive side in the X-axis direction of the first element group GA located on both sides of the second element group GB1, and the cathode electrode 56c of the second light-emitting element 56B included in the second element group GB1. Hereinafter, the positive side in the X-axis direction may be referred to as the right side.

The second wiring pattern P30 connects in series the anode electrode 56b of the first light-emitting element 56A4 included in the first element group GA2 and the cathode electrode 56c of the second light-emitting element 56B1 included in the second element group GB1. The second wiring pattern P40 connects in series the anode electrode 56b of the first light-emitting element 56A3 included in the first element group GA2 and the cathode electrode 56c of the second light-emitting element 56B2 included in the second element group GB1.

The second wiring pattern P30 includes a second cathode wiring pattern P31, a second anode wiring pattern P32, and a second connection pattern P33. The second cathode wiring pattern P31 is connected to the cathode electrode 56c of the second light-emitting element 56B1 included in the second element group GB1 and is a wiring pattern that extends to the positive side in the Z-axis direction. As described above, the cathode electrode 56c is provided on the back surface of each light-emitting element 56, and therefore the cathode electrode 56c of the second light-emitting element 56B1 is connected to the second cathode wiring pattern P31 by a die-bonding material or the like.

The second anode wiring pattern P32 is connected to the anode electrode 56b of the first light-emitting element 56A4 included in the first element group GA2 and is a wiring pattern that extends to the positive side in the Z-axis direction. As described above, the anode electrode 56b is provided on the surface of each light-emitting element 56, and therefore the anode electrode 56b of the first light-emitting element 56A4 is connected to the second anode wiring pattern P32 by wire bonding or the like. The second connection pattern P33 is a wiring pattern that connects the second cathode wiring pattern P31 and the second anode wiring pattern P32 and extends in the X-axis direction.

The second wiring pattern P40 includes a second cathode wiring pattern P41, a second anode wiring pattern P42, and a second connection pattern P43. The second cathode wiring pattern P41 is connected to the cathode electrode 56c of the second light-emitting element 56B2 included in the second element group GB1 and is a wiring pattern that extends to the positive side in the Z-axis direction. Similar to the second light-emitting element 56B1, the cathode electrode 56c of the second light-emitting element 56B2 is connected to the second cathode wiring pattern P41 by a die-bonding material or the like.

The second anode wiring pattern P42 is connected to the anode electrode 56b of the first light-emitting element 56A3 included in the first element group GA2 and is a wiring pattern that extends in the positive direction of the Z-axis. As with the first light-emitting element 56A4, the anode electrode 56b of the first light-emitting element 56A3 is connected to the second anode wiring pattern P42 by wire bonding or the like. The second connection pattern P43 is a wiring pattern that connects the second cathode wiring pattern P41 and the second anode wiring pattern P42 and extends in the X-axis direction.

In the example shown in FIG. 3, the width of the second cathode wiring pattern P31 is the same as the width of the second anode wiring pattern P32. Similarly, the width of the second cathode wiring pattern P41 is the same as the width of the second anode wiring pattern P42. The length of the second cathode wiring pattern P41 is shorter than the length of the second cathode wiring pattern P31. Similarly, the length of the second anode wiring pattern P42 is shorter than the length of the second anode wiring pattern P32. The length of the second connection pattern P43 is shorter than the length of the second connection pattern P33.

As described above, the length of the second wiring pattern P30, which connects the first light-emitting element 56A4 and the second light-emitting element 56B1 in series, is longer than the length of the second wiring pattern P40, which connects the first light-emitting element 56A3 and the second light-emitting element 56B2 in series. The second wiring pattern P30 is arranged to surround the second wiring pattern P40.

As shown in FIG. 3, the wiring pattern includes two first wiring patterns P50 and P60 that individually connect in series the cathode electrode 56c of the first light-emitting element 56A included in the first element group GA2 and the anode electrode 56b of the second light-emitting element 56B included in the second element group GB2.

The first wiring pattern P50 connects in series the cathode electrode 56c of the first light-emitting element 56A3 included in the first element group GA2 and the anode electrode 56b of the second light-emitting element 56B4 included in the second element group GB2. The configuration of the first wiring pattern P50 is the same as the configuration of the first wiring pattern P10. The first wiring pattern P60 connects in series the cathode electrode 56c of the first light-emitting element 56A4 included in the first element group GA2 and the anode electrode 56b of the second light-emitting element 56B3 included in the second element group GB2. The configuration of the first wiring pattern P60 is the same as the configuration of the first wiring pattern P20.

The wiring pattern also includes two second wiring patterns P70 and P80 that individually connect in series the anode electrode 56b of the first light-emitting element 56A included in the first element group GA (not shown) located to the right of the second element group GB2 and the cathode electrode 56c of the second light-emitting element 56B included in the second element group GB2. The configuration of the second wiring pattern P70 is the same as the configuration of the second wiring pattern P30. The configuration of the second wiring pattern P80 is the same as the configuration of the second wiring pattern P40.

Furthermore, the wiring pattern includes two second wiring patterns P90 and P100 that individually connect in series the anode electrode 56b of the first light-emitting element 56A included in the first element group GA1 and the cathode electrode 56c of the second light-emitting element 56B included in the second element group GB (not shown) located to the left of the first element group GA1. The configuration of the second wiring pattern P90 is the same as the configuration of the second wiring pattern P30. The configuration of the second wiring pattern P100 is the same as the configuration of the second wiring pattern P40.

As described above, the first light-emitting element 56A1, the second light-emitting element 56B2, the first light-emitting element 56A3, and the second light-emitting element 56B4 are connected in series by the first wiring pattern P10, the second wiring pattern P40, the first wiring pattern P50, the second wiring pattern P80, and the second wiring pattern P100. Hereinafter, the series circuit including the first light-emitting element 56A1, the second light-emitting element 56B2, the first light-emitting element 56A3, and the second light-emitting element 56B4 may be referred to as the first series circuit.

The first wiring pattern P20, the second wiring pattern P30, the first wiring pattern P60, the second wiring pattern P70, and the second wiring pattern P90 connect the first light-emitting element 56A2, the second light-emitting element 56B1, the first light-emitting element 56A4, and the second light-emitting element 56B3 in series. Hereinafter, the series circuit including the first light-emitting element 56A2, the second light-emitting element 56B1, the first light-emitting element 56A4, and the second light-emitting element 56B3 may be referred to as the second series circuit.

The first series circuit and the second series circuit are driven in parallel by the same power supply (not shown). That is, the power supply simultaneously applies the same drive voltage to each of the first series circuit and the second series circuit so that a forward current flows through each of the light-emitting elements 56 included in the first series circuit and the second series circuit. This causes excitation light E to be emitted from each of the light-emitting elements 56 included in the first series circuit and the second series circuit.

The power supply device also has the function of selectively applying a drive voltage to one of the first series circuit and the second series circuit. For example, when the power supply device selectively applies a drive voltage to the first series circuit, excitation light E is emitted from each of the light-emitting elements 56 included in the first series circuit. In this way, when a drive voltage is applied to one of the first series circuit and the second series circuit, the overall brightness of the light-emitting module 51 is reduced compared to when a drive voltage is applied to both the first series circuit and the second series circuit. As described above, the overall brightness of the light-emitting module 51 is controlled by the power supply device, and as a result, the brightness of the fluorescence Y emitted from the light source device 100 is controlled.

(Effects of this embodiment)
As described above, the light-emitting module 51 of this embodiment includes a first element group GA including two first light-emitting elements 56A and a second element group GB including two second light-emitting elements 56B. The first element group GA and the second element group GA are alternately arranged along the X-axis direction. The first light-emitting elements 56A and the second light-emitting elements 56B are aligned in a row along the X-axis direction. The cathode electrode 56c of the first light-emitting element 56A and the anode electrode 56b of the second light-emitting element 56B are located on the negative side of the Z-axis direction, which intersects with the X-axis direction. The anode electrode 56b of the first light-emitting element 56A and the cathode electrode 56c of the second light-emitting element 56B are located on the positive side of the Z-axis direction. Each of the first light-emitting elements 56A included in the first element group GA is connected in series via a wiring pattern to a second light-emitting element 56B included in the second element group GB adjacent to the first element group GA, the second light-emitting element 56B being located at a position symmetrical with respect to a virtual line (VL1, VL2, VL3) as the axis of symmetry. The virtual line is a straight line located between the adjacent first element group GA and second element group GB and extending in the Z-axis direction.

In the light-emitting module 51 of this embodiment, two series circuits are configured: a first series circuit including the first light-emitting element 56A1, the second light-emitting element 56B2, the first light-emitting element 56A3, and the second light-emitting element 56B4; and a second series circuit including the first light-emitting element 56A2, the second light-emitting element 56B1, the first light-emitting element 56A4, and the second light-emitting element 56B3. In the first element group GA1, the first light-emitting element 56A2 belonging to the second series circuit is located to the right of the first light-emitting element 56A1 belonging to the first series circuit. In the second element group GB1, the second light-emitting element 56B2 belonging to the first series circuit is located to the right of the second light-emitting element 56B1 belonging to the second series circuit. In the first element group GA2, the first light-emitting element 56A4 belonging to the second series circuit is located to the right of the first light-emitting element 56A3 belonging to the first series circuit. In the second element group GB2, the second light-emitting element 56B4 belonging to the first series circuit is located to the right of the second light-emitting element 56B3 belonging to the second series circuit.

As described above, in the light-emitting module 51 of this embodiment, the light-emitting elements 56 belonging to the first series circuit and the light-emitting elements 56 belonging to the second series circuit are arranged alternately along the X-axis direction. As a result, when the temperature of one of the first and second series circuits rises, the temperature of the other series circuit also rises, thereby reducing the temperature difference between the first and second series circuits. As a result, it is possible to prevent imbalances in the values of current flowing through the first and second series circuits, thereby reducing variations in brightness between different series circuits. Furthermore, it is possible to prevent variations in the lifespan of each light-emitting element 56.
In this way, according to this embodiment, it is possible to prevent differences in circuit characteristics between different series circuits, and therefore it is possible to drive different series circuits in parallel using the same power supply device. In the technology of Patent Document 1, differences in circuit characteristics occur between different series circuits due to temperature differences between the different series circuits, making it difficult to use the same power supply device.
Furthermore, according to this embodiment, when one of the first series circuit and the second series circuit is selectively driven to light up the light-emitting module 51 at low brightness, the light-emitting elements 56, which are heat sources, are dispersedly arranged, thereby reducing the load on cooling the light-emitting module 51. Therefore, if a cooling fan is provided, the noise generated by the cooling fan can also be reduced.
Furthermore, according to this embodiment, the potential of the wiring pattern of the first series circuit and the potential of the wiring pattern of the second series circuit are substantially equal, which reduces the electric field strength between the two wiring patterns, thereby allowing the circuit characteristics of the first series circuit and the second series circuit to be maintained for a long period of time.

In the light-emitting module 51 of this embodiment, the wiring pattern includes a first cathode wiring pattern (P11, P21) connected to the cathode electrode 56c of the first light-emitting element 56A and extending to the negative side in the Z-axis direction, and a second cathode wiring pattern (P31, P41) connected to the cathode electrode 56c of the second light-emitting element 56B and extending to the positive side in the Z-axis direction.
According to this configuration, heat generated from the cathode electrode 56c of the light-emitting element 56 is dissipated through the first cathode wiring pattern (P11, P21) and the second cathode wiring pattern (P31, P41), thereby suppressing the temperature rise of each light-emitting element 56.

In the light-emitting module 51 of this embodiment, the wiring pattern further includes a first anode wiring pattern (P12, P22) connected to the anode electrode 56b of the second light-emitting element 56B and extending to the negative side in the Z-axis direction, and a second anode wiring pattern (P32, P42) connected to the anode electrode 56b of the first light-emitting element 56A and extending to the positive side in the Z-axis direction.
According to this configuration, heat generated from the anode electrode 56b of the light-emitting element 56 is dissipated through the first anode wiring pattern (P12, P22) and the second anode wiring pattern (P32, P42), thereby suppressing the temperature rise of each light-emitting element 56.

The light-emitting module 51 of this embodiment includes a first element group GA including two first light-emitting elements 56A, a second element group GB including two second light-emitting elements 56B, and a wiring pattern connecting the first element group GA and the second element group GB. The two first light-emitting elements 56A include first light-emitting elements 56A1 (first element) and 56A2 (second element), and the two second light-emitting elements 56B include second light-emitting elements 56B1 (third element) and 56B2 (fourth element). The first element group GA and the second element group GB are arranged side by side along a first direction (X-axis direction). The first light-emitting element 56A1 (first element), the first light-emitting element 56A2 (second element), the second light-emitting element 56B1 (third element), and the second light-emitting element 56B2 (fourth element) are arranged in this order in the first direction. The cathode electrode 56c of the first light-emitting element 56A and the anode electrode 56b of the second light-emitting element 56B are positioned in a second direction (negative side of the Z-axis direction), and the anode electrode 56b of the first light-emitting element 56A and the cathode electrode 56c of the second light-emitting element 56B are positioned in a third direction (positive side of the Z-axis direction) opposite the second direction. The wiring pattern has a first wiring pattern P10 and a second wiring pattern P20. The first light-emitting element 56A1 (first element) and the second light-emitting element 56B2 (fourth element) form a first series circuit connected by the first wiring pattern P10, and the first light-emitting element 56A2 (second element) and the second light-emitting element 56B1 (third element) form a second series circuit connected by the second wiring pattern P20.
As described above, this configuration reduces the temperature difference between the first and second series circuits. As a result, it is possible to prevent imbalances in the values of the currents flowing through the first and second series circuits, thereby reducing variations in brightness between the different series circuits. Furthermore, it is possible to reduce variations in the lifespan of the light-emitting elements 56.

The light-emitting module 51 of this embodiment includes a substrate 55 on which the first element group GA and the second element group GB are arranged, and the wiring patterns are arranged on the same surface (e.g., the component mounting surface) of the substrate 55. In other words, the wiring patterns of the light-emitting module 51 do not cross over each other.
According to this configuration, the thickness of the substrate 55 can be reduced, and the substrate 55 can be manufactured more easily.

The light source device 100 of this embodiment includes the light emitting module 51 of this embodiment and a wavelength conversion member 50 that contains a phosphor and converts the excitation light E emitted from the light emitting module 51 into fluorescence Y having a wavelength band different from the wavelength band of the excitation light E.
The light source device 100 of this embodiment includes the light emitting module 51 of this embodiment, and therefore the luminance of the fluorescent light Y can be controlled using the same power supply device.

The projector 1 of this embodiment includes the light source device 100 of this embodiment, light modulation devices (4R, 4G) that modulate light containing fluorescence Y emitted from the light source device 100 in accordance with image information, and a projection optical device 6 that projects the light modulated by the light modulation devices (4R, 4G).
According to the projector 1 of this embodiment, since it is equipped with the light source device 100 of this embodiment, the luminance of the fluorescent light Y incident on the light modulation devices (4R, 4G) can be controlled using the same power supply device.

The above describes one embodiment of the present invention. While the technical scope of the present invention is described in one embodiment of the present invention, with the peak wavelength of, for example, 455 nm as the first wavelength band of the light-emitting element 56, it is not limited to this wavelength band and can be applied to light-emitting diodes (LEDs) and semiconductor lasers of various wavelengths. Furthermore, the technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. Below, modified examples of the present invention are described.

(First Modification)
FIG. 4 is a diagram showing a first modified example of the circuit configuration of the light-emitting module 51. In FIG.
In the above embodiment, the width of the first cathode wiring patterns (P11, P21) is the same as the width of the first anode wiring patterns (P12, P22), and the width of the second cathode wiring patterns (P31, P41) is the same as the width of the second anode wiring patterns (P32, P42). However, the present invention is not limited to this. The amount of heat generated from the anode electrodes 56b of the light-emitting elements 56 is smaller than the amount of heat generated from the cathode electrodes 56c of the light-emitting elements 56. Therefore, for example, as shown in FIG. 4 , the width of the first anode wiring patterns (P12, P22) may be smaller than the width of the first cathode wiring patterns (P11, P21), and the width of the second anode wiring patterns (P32, P42) may be smaller than the width of the second cathode wiring patterns (P31, P41).

(Second Modification)
FIG. 5 is a diagram showing a second modified example of the circuit configuration of the light-emitting module 51. In FIG.
In the above embodiment, a gap extending to the negative side in the Z-axis direction exists between a pair of first cathode wiring patterns P21 and first anode wiring patterns P22 adjacent to each other in the X-axis direction, and a gap extending to the positive side in the Z-axis direction exists between a pair of second cathode wiring patterns P41 and second anode wiring patterns P42 adjacent to each other in the X-axis direction. However, the present invention is not limited to this. For example, as shown in FIG. 5 , a pair of first cathode wiring patterns P21 and first anode wiring patterns P22 adjacent to each other in the X-axis direction may be connected without a gap, and a pair of second cathode wiring patterns P41 and second anode wiring patterns P42 adjacent to each other in the X-axis direction may be connected without a gap. Note that the second modification and the first modification may be combined.

(Third Modification)
FIG. 6 is a diagram showing a third modified example of the circuit configuration of the light-emitting module 51. In FIG.
In the above embodiment, the first element group GA includes two first light-emitting elements 56A and the second element group GB includes two second light-emitting elements 56B, but the present invention is not limited to this. For example, as shown in FIG. 6 , the first element group GA may include three first light-emitting elements 56A and the second element group GB may include three second light-emitting elements 56B. Alternatively, the first element group GA may include four or more first light-emitting elements 56A and the second element group GB may include four or more second light-emitting elements 56B. Note that the third modification may be combined with at least one of the first modification and the second modification.

In FIG. 6, the first light-emitting element 56A located in the first position from the negative side (left side) of the X-axis corresponds to the first element, and the first light-emitting element 56A located in the third position from the left corresponds to the second element. The second light-emitting element 56B located in the fourth position from the left corresponds to the third element, and the second light-emitting element 56B located in the sixth position from the left corresponds to the fourth element. The first light-emitting element 56A located in the seventh position from the left corresponds to the fifth element, and the first light-emitting element 56A located in the ninth position from the left corresponds to the sixth element. The first light-emitting element 56A located in the second position from the left corresponds to the tenth element, the second light-emitting element 56B located in the fifth position from the left corresponds to the eleventh element, and the first light-emitting element 56A located in the eighth position from the left corresponds to the twelfth element.

(Other Modifications)
In the above embodiment, the anode electrode 56b is provided on the front surface of the light emitting element 56, and the cathode electrode 56c is provided on the back surface of the light emitting element 56. However, the present invention is not limited to this. A light emitting element in which both the anode electrode 56b and the cathode electrode 56c are provided on the front surface or the back surface may be used.

Furthermore, the specific descriptions of the shape, number, arrangement, materials, etc. of each component of the light source device and projector are not limited to those of the above embodiment and can be modified as appropriate. Furthermore, while the above embodiment shows an example in which the light source device of the present invention is mounted in a projector that uses a liquid crystal panel, this is not limiting. The light source device of the present invention may also be applied to a projector that uses a digital micromirror device as a light modulation device. Furthermore, the projector does not need to have multiple light modulation devices, and may have only one light modulation device.

In the above embodiment, an example was shown in which the light source device of the present invention was applied to a projector, but this is not limited to this. The light source device of the present invention can also be applied to lighting fixtures, automobile headlights, etc.

The light-emitting module according to one embodiment of the present invention may have the following structure.
An embodiment of the light-emitting module of the present invention comprises a first element group including N (N is an integer greater than or equal to 2) first light-emitting elements, and a second element group including N second light-emitting elements, wherein the first element group and the second element group are arranged alternately along a first direction, the first light-emitting elements and the second light-emitting elements are lined up in a row along the first direction, the cathode electrode of the first light-emitting element and the anode electrode of the second light-emitting element are located on one side of a second direction intersecting the first direction, and the anode electrode of the first light-emitting element and the cathode electrode of the second light-emitting element are located on the other side of the second direction, each of the first light-emitting elements included in the first element group is connected in series with a second light-emitting element included in the second element group adjacent to the first element group, the second light-emitting element being located in a position symmetrical with respect to a virtual line as an axis of symmetry, via a wiring pattern, and the virtual line is a straight line located between the adjacent first element group and second element group and extending in the second direction.

In one aspect of the light-emitting module of the present invention, the wiring pattern may include a first cathode wiring pattern connected to the cathode electrode of the first light-emitting element and extending to one side in the second direction, and a second cathode wiring pattern connected to the cathode electrode of the second light-emitting element and extending to the other side in the second direction.

In one aspect of the light-emitting module of the present invention, the wiring pattern may further include a first anode wiring pattern connected to the anode electrode of the second light-emitting element and extending to one side in the second direction, and a second anode wiring pattern connected to the anode electrode of the first light-emitting element and extending to the other side in the second direction.

In one aspect of the light-emitting module of the present invention, the width of the first anode wiring pattern may be smaller than the width of the first cathode wiring pattern, and the width of the second anode wiring pattern may be smaller than the width of the second cathode wiring pattern.

In a light-emitting module according to one aspect of the present invention, a pair of the first cathode wiring pattern and the first anode wiring pattern adjacent to each other in the first direction may be connected without any gaps, and a pair of the second cathode wiring pattern and the second anode wiring pattern adjacent to each other in the first direction may be connected without any gaps.

The light-emitting module according to one embodiment of the present invention may have the following structure.
A light-emitting module according to one aspect of the present invention includes a first element group including N (N is an integer of 2 or more) first light-emitting elements, a second element group including N (N is an integer of 2 or more) second light-emitting elements, and a wiring pattern connecting the first element group and the second element group, wherein the N first light-emitting elements include first elements and second elements, and the N second light-emitting elements include third elements and fourth elements, the first element group and the second element group are arranged side by side along a first direction, and the first elements, the second elements, the third elements, and the fourth elements are arranged in this order toward the first direction, The cathode electrode of the first light-emitting element and the anode electrode of the second light-emitting element are located in a second direction intersecting the first direction, the anode electrode of the first light-emitting element and the cathode electrode of the second light-emitting element are located in a third direction opposite to the second direction, the wiring pattern has a first wiring pattern and a second wiring pattern, the first element and the fourth element form a first series circuit connected by the first wiring pattern, and the second element and the third element form a second series circuit connected by the second wiring pattern.

The light-emitting module of one aspect of the present invention may include a substrate on which the first element group and the second element group are arranged, and the wiring pattern may be arranged on the same plane on the substrate.

The light source device according to one aspect of the present invention may have the following configuration.
A light source device according to one aspect of the present invention comprises a light emitting module according to the above aspect, and a wavelength conversion member that contains a phosphor and converts first light emitted from the light emitting module into second light having a wavelength band different from the wavelength band of the first light.

A projector according to an aspect of the invention may have the following configuration.
A projector according to one aspect of the present invention comprises a light source device according to the above aspect, a light modulation device that modulates light including the second light emitted from the light source device in accordance with image information, and a projection optical device that projects the light modulated by the light modulation device.

1...Projector, 4B, 4G, 4R...Light modulation device, 6...Projection optical device, 50...Wavelength conversion member, 51...Light emitting module, 55...Substrate, 56...Light emitting element, 56A, 56A1, 56A2, 56A3, 56A4...First light emitting element, 56B, 56B1, 56B2, 56B3, 56B4...Second light emitting element, 56a...Light emitting surface, 56b...Anode electrode, 56c...Cathode electrode, GA, GA1, GA2...First element group, GB, GB1, GB2...Second element group, 100...Light source device, E...Excitation light (first light), Y...Fluorescence (second light), VL1, VL2, VL3...Virtual line

Claims (10)

a first element group including N (N is an integer of 2 or more) first light-emitting elements;
a second element group including N second light-emitting elements;
Equipped with
the first element groups and the second element groups are alternately arranged along a first direction,
the first light-emitting element and the second light-emitting element are aligned in a line along the first direction,
a cathode electrode of the first light-emitting element and an anode electrode of the second light-emitting element are located on one side of a second direction intersecting the first direction,
an anode electrode of the first light-emitting element and a cathode electrode of the second light-emitting element are located on the other side in the second direction,
each of the first light-emitting elements included in the first element group is connected in series via a wiring pattern to a second light-emitting element included in the second element group adjacent to the first element group, the second light-emitting element being located at a position symmetrical with respect to a virtual line as a symmetry axis;
the virtual line is a straight line located between the first element group and the second element group adjacent to each other and extending in the second direction,
the first light-emitting element and the second light-emitting element are light-emitting elements of the same type,
The light-emitting elements of the same type are light-emitting elements that emit excitation light of the same wavelength band.
Light-emitting module. The wiring pattern is
a first cathode wiring pattern connected to the cathode electrode of the first light-emitting element and extending to the one side in the second direction;
a second cathode wiring pattern connected to the cathode electrode of the second light-emitting element and extending to the other side in the second direction;
The light emitting module of claim 1 , comprising: The wiring pattern is
a first anode wiring pattern connected to the anode electrode of the second light-emitting element and extending to the one side in the second direction;
a second anode wiring pattern connected to the anode electrode of the first light-emitting element and extending to the other side in the second direction;
The light emitting module of claim 2 , further comprising: the width of the first anode wiring pattern is smaller than the width of the first cathode wiring pattern;
the width of the second anode wiring pattern is smaller than the width of the second cathode wiring pattern;
The light emitting module according to claim 3 . a pair of the first cathode wiring pattern and the first anode wiring pattern adjacent to each other in the first direction are connected without any gaps;
a pair of the second cathode wiring pattern and the second anode wiring pattern adjacent to each other in the first direction are connected without any gaps;
The light emitting module according to claim 3 or 4. a first element group including N (N is an integer of 2 or more) first light-emitting elements;
a second element group including N (N is an integer of 2 or more) second light-emitting elements;
a wiring pattern connecting the first element group and the second element group;
Equipped with
The N first light-emitting elements include a first element and a second element, and the N second light-emitting elements include a third element and a fourth element,
the first element group and the second element group are arranged side by side along a first direction,
the first element, the second element, the third element, and the fourth element are arranged in this order in the first direction,
a cathode electrode of the first light-emitting element and an anode electrode of the second light-emitting element are positioned in a second direction intersecting the first direction;
an anode electrode of the first light emitting element and a cathode electrode of the second light emitting element are positioned in a third direction opposite to the second direction;
the wiring pattern includes a first wiring pattern and a second wiring pattern,
the first element and the fourth element form a first series circuit connected by the first wiring pattern;
the second element and the third element form a second series circuit connected by the second wiring pattern,
the first light-emitting element and the second light-emitting element are light-emitting elements of the same type,
The light-emitting elements of the same type are light-emitting elements that emit excitation light of the same wavelength band.
Light-emitting module. a substrate on which the first element group and the second element group are arranged,
The wiring patterns are disposed on the same plane on the substrate.
The light emitting module according to claim 1 . a light-emitting module;
a wavelength conversion member that includes a phosphor and converts a first light emitted from the light emitting module into a second light having a wavelength band different from a wavelength band of the first light;
Equipped with
The light emitting module includes:
a first element group including N (N is an integer of 2 or more) first light-emitting elements;
a second element group including N second light-emitting elements;
Equipped with
the first element groups and the second element groups are alternately arranged along a first direction,
the first light-emitting element and the second light-emitting element are aligned in a line along the first direction,
a cathode electrode of the first light-emitting element and an anode electrode of the second light-emitting element are located on one side of a second direction intersecting the first direction,
an anode electrode of the first light-emitting element and a cathode electrode of the second light-emitting element are located on the other side in the second direction,
each of the first light-emitting elements included in the first element group is connected in series via a wiring pattern to a second light-emitting element included in the second element group adjacent to the first element group, the second light-emitting element being located at a position symmetrical with respect to a virtual line as a symmetry axis;
the virtual line is a straight line located between the first element group and the second element group adjacent to each other and extending in the second direction.
Light source device. a light-emitting module;
a wavelength conversion member that includes a phosphor and converts a first light emitted from the light emitting module into a second light having a wavelength band different from a wavelength band of the first light;
Equipped with
The light emitting module includes:
a first element group including N (N is an integer of 2 or more) first light-emitting elements;
a second element group including N (N is an integer of 2 or more) second light-emitting elements;
a wiring pattern connecting the first element group and the second element group;
Equipped with
The N first light-emitting elements include a first element and a second element, and the N second light-emitting elements include a third element and a fourth element,
the first element group and the second element group are arranged side by side along a first direction,
the first element, the second element, the third element, and the fourth element are arranged in this order in the first direction,
a cathode electrode of the first light-emitting element and an anode electrode of the second light-emitting element are positioned in a second direction intersecting the first direction;
an anode electrode of the first light emitting element and a cathode electrode of the second light emitting element are positioned in a third direction opposite to the second direction;
the wiring pattern includes a first wiring pattern and a second wiring pattern,
the first element and the fourth element form a first series circuit connected by the first wiring pattern;
the second element and the third element form a second series circuit connected by the second wiring pattern;
Light source device. The light source device according to claim 8 or 9;
a light modulation device that modulates the light including the second light emitted from the light source device in accordance with image information;
a projection optical device that projects the light modulated by the light modulation device;
Equipped with
projector.