JP5897291B2 - Lens and lighting device - Google Patents

Description

  The present invention relates to a lens that refracts and emits light emitted from a light source, and an illumination device including the lens.

  Conventionally, a lighting device is used in which a lens is disposed between a light source and a diffusion plate, and the light emitted from the light source is diffused by the lens and incident on the diffusion plate to emit light in a planar shape. It has been.

  For example, Patent Literature 1 discloses an illumination device that emits light in a planar shape as described above, and scatters light at a position in the optical axis direction of light emitted from a light source on a light source side surface of a lens. A technique for providing an optical function unit for diffusion is disclosed. Thereby, in the technique of Patent Document 1, the light emitted from the light source is scattered or diffused by the optical function unit, and the luminance of the region immediately above the light source (region on the optical axis) in the diffusion plate is higher than that in other regions. It is prevented from becoming.

Japanese Patent No. 4479805 (publication date: August 27, 2009)

  However, in the technique of the above-mentioned Patent Document 1, there are flat portions parallel to the substrate surface of the substrate on which the light source is disposed in the regions on both ends of the lens inner peripheral surface (near the contact portion with the substrate on which the light source is disposed). Is provided. For this reason, the light incident on the planar portion from the light source is condensed on a partial area of the diffusion plate, and uneven brightness (bright spots or bright lines) occurs in the diffusion plate.

  FIG. 9 is an explanatory diagram for explaining the above problem. The luminaire 100 shown in this figure is disposed so as to face the substrate 101, a light source 102 made of LEDs provided on the substrate 101, a lens 103 that diffuses light emitted from the light source 102, and the lens 103. The diffusion plate 104 is provided. The lens 103 has a curved portion, and is disposed to face the substrate 101 so as to cover the light source disposed on the substrate 101 by the curved portion. Further, in the vicinity of both ends of the inner peripheral surface of the lens 103, that is, in the vicinity of the end portion facing the substrate 101 on the inner peripheral surface of the lens 103, a plane portion parallel to the substrate surface of the substrate 101, as in the configuration of Patent Document 1. 103a is provided.

  In the lighting fixture 100 having such a configuration, the traveling direction of the light emitted from the light source 102 and reaching the flat portion 103a is the optical axis direction of the light source 102 (the substrate surface normal direction of the substrate 101) due to refraction in the flat portion 103a. (Refer to the arrow indicated by a broken line). Further, the traveling direction of light that has entered the lens 103 from the flat portion 103a and reached the lens outer peripheral surface 103b changes in a direction closer to the optical axis direction of the light source 102 due to refraction at the lens outer peripheral surface 103b (shown by a broken line). See arrow). Further, as shown in FIG. 9, the refraction angles at the plane portion 103a and the lens outer peripheral surface 103b differ depending on the incident angles of light with respect to these portions. For this reason, the light emitted from the light source 102 and incident on the flat portion 103a is condensed on a partial region of the diffusion plate 104 and is visually recognized as luminance unevenness (bright spot or bright line).

  In particular, in the configuration of FIG. 9, since the distance between the light source 102 and the flat portion 103 a is short, the proportion of light incident on the flat portion of the light emitted from the light source 102 is large, and bright lines are likely to occur in the diffusion plate 104. Further, in the configuration of FIG. 9, when the position of the lens 103 is shifted in the direction away from the substrate 101 along the optical axis direction of the light source 102 from the normal mounting position due to an attachment error of the lens 103 or the like, the light is incident on the flat portion 103 a. The ratio of the light to be further increased, and more noticeable bright lines are generated in the diffusion plate 104.

  The present invention has been made in view of the above-described problems, and an object thereof is to suppress luminance unevenness due to light emitted from the lens in an illumination device including a lens that refracts light emitted from a light source. There is to do.

In order to solve the above-described problem, the lens of the present invention is a lens that refracts and emits light incident from a light source, and is disposed so as to face the light source, on the light emission direction side of the light source. A curved portion having a recessed portion, and the curved portion has an end surface facing a position different from the position of the light source on the surface of the mounted member on which the light source is mounted, When the distance from the center to the end on the light source side at the end surface is a, and the distance from the end on the light source side to the end on the opposite side of the light source is b, the relationship of a> b is satisfied, An inner peripheral surface that is a surface on the light source side in the curved portion is a curved surface disposed at a position including the optical axis direction of the light source, and the end surface disposed between the end surface and the curved surface. It consists of a notch surface that is inclined with respect to the above bay. Provided with a flat plate portion having a surface extending from the end surface so as to face the mounted member, the thickness of the flat plate portion being larger than the thickness of the curved portion. rather thin, the outer peripheral surface of the curved portion is characterized in that a curved surface convex to the light exit side of the light source.

  According to said structure, since the distance of a light source and an end surface is long and the area of an end surface is small, the light quantity radiate | emitted from a light source and can inject into an end surface can be reduced, and the light which injected into the end surface is made into a specific area | region. It is possible to prevent light from being condensed and to prevent occurrence of luminance unevenness.

  The inner peripheral surface, which is the light source side surface of the curved portion, is disposed between the curved surface disposed at a position including the optical axis direction of the light source, and the end surface and the curved surface. It is good also as a structure which consists of a notch surface which is a surface inclined with respect to the end surface.

  According to said structure, by having a notch surface, the distance of a light source and an end surface can be lengthened more, and the area of an end surface can be made smaller. Accordingly, the amount of light emitted from the light source toward the side and incident on the end face can be further reduced, so that it is possible to more appropriately prevent the light emitted from the light source from being collected in a specific region. .

  The illumination device of the present invention includes a light source, a member to be mounted on which the light source is mounted, and any of the lenses described above.

  According to said structure, since the distance of a light source and an end surface is long and the area of an end surface is small, the light quantity radiate | emitted from a light source and can inject into an end surface can be reduced, and the light which injected into the end surface is made into a specific area | region. It is possible to prevent light from being condensed and to prevent occurrence of luminance unevenness.

  The lens further includes a diffusion plate disposed opposite to a surface opposite to the light source side of the lens, and diffuses the light emitted from the light source by the lens and causes the diffusion plate to enter the diffusion plate. It may be configured to emit light in a planar shape.

  According to said structure, it can prevent that the light radiate | emitted from the light source is condensed on the specific area | region in a diffusion plate with a lens, and can prevent that the brightness | luminance nonuniformity arises in a diffusion plate.

  Further, a reflection for reflecting light emitted from the light source at an inclination angle of a predetermined angle or more with respect to the optical axis direction of the light source toward the diffusion plate between the mounted member and the diffusion plate. It is good also as a structure provided with the reflective member which has a surface.

  According to said structure, since the light quantity of the light which reaches | attains a diffuser plate can be increased, the utilization efficiency of light can be improved.

  Further, the reflection surface may be inclined with respect to a surface of the mounted member that faces the end surface.

  According to said structure, it can prevent that the light reflected by the reflection member is condensed on the specific area | region in a diffusion plate, and can prevent that brightness nonuniformity arises with the light reflected by the reflection member.

In addition, the lens has an inner peripheral surface, which is a surface on the light source side in the curved portion, disposed between a curved surface disposed at a position including the optical axis of the light source, and the end surface and the curved surface. And a surface extending from the end surface so as to face the mounted member, which is provided on the outer peripheral surface side of the curved portion, and is formed of a notched surface that is inclined with respect to the end surface. The inclined angle of the cut surface with respect to the end surface is such that a part of the light emitted from the light source and incident into the lens from the cut surface enters the outside of the lens from the outer peripheral surface of the curved portion. An angle at which another part of the light emitted from the light source and incident into the lens from the cut surface is emitted to the outside of the lens through the flat plate portion, and the cut surface is Through the outer peripheral surface of the curved portion Is an angle at which the light emitted to the part reaches a predetermined range including the outer edge of the diffusion plate, and the shape of the reflective surface of the reflective member is emitted from the flat plate part via the notch surface. Light emitted from the flat plate portion through the notch surface so that at least a part of the reach range of the light to the diffusion plate is on the optical axis direction side of the light source with respect to the region of the predetermined range in the diffusion plate. It is good also as a structure which is a shape which reflects. Or the illuminating device of this invention is an illuminating device provided with the light source, the to-be-mounted member with which the said light source is mounted | worn, and the lens which refracts | emits and radiate | emits the light which injects from a light source, Comprising: A diffusion plate disposed opposite to the surface opposite to the light source side, and diffusing the light emitted from the light source by the lens and entering the diffusion plate so that the diffusion plate emits light in a planar shape The light emitted from the light source at an inclination angle of a predetermined angle or more with respect to the optical axis direction of the light source is reflected toward the diffusion plate between the mounted member and the diffusion plate. A reflective member having a reflective surface for the light source, the lens is disposed so as to face the light source, and includes a curved portion having a concave portion recessed on the light emitting direction side of the light source, The above light source is installed A distance from the center of the arrangement position of the light source to the end of the light source side at the end face is a, the light source side When the distance from the end of the light source to the end opposite to the light source is b, the relationship of a> b is satisfied, and the inner peripheral surface that is the light source side surface of the curved portion is the light of the light source. A curved surface disposed at a position including the shaft; and a cutout surface that is disposed between the end surface and the curved surface and is inclined with respect to the end surface; A flat plate portion having a surface extending from the end surface so as to face the mounted member, and an inclination angle of the notch surface with respect to the end surface is emitted from the light source and the notch surface A part of the light incident on the lens An angle at which another part of the light emitted from the outer peripheral surface of the lens to the outside of the lens, emitted from the light source, and incident on the lens from the cutout surface is emitted to the outside of the lens through the flat plate portion. And an angle at which light emitted from the outer peripheral surface of the curved portion to the outside of the lens through the notch surface reaches a region in a predetermined range including an outer edge portion of the diffusion plate, and the reflecting member The shape of the reflecting surface of the light source is such that at least a part of the reach of the light emitted from the flat plate portion through the notch surface to the diffuser plate is light from the light source more than the region of the predetermined range on the diffuser plate. It is good also as a structure which is a shape which reflects the light radiate | emitted from the said flat plate part through the said notch surface so that it may become an axial direction side.

  According to said structure, since the light which injects into the flat part of a lens can be reduced by providing a notch surface, the light radiate | emitted from the light source is condensed on the specific area | region in a diffusion plate with a lens. This can be prevented more appropriately. Further, of the light incident on the notch, the reach of the light emitted from the outer peripheral surface of the curved portion to the outside of the lens and the reach of the light emitted from the flat plate to the outside of the lens to the diffuser Therefore, it is possible to more appropriately prevent light from condensing on a specific region of the diffuser plate.

  Further, the light source may have a configuration in which the light source has an emission light characteristic in which a color temperature of the emission light changes according to an inclination angle with respect to the optical axis direction.

  According to said structure, the light radiate | emitted from the lens to the board | substrate side rather than the diffuser plate, ie, the emitted light with a large inclination angle with respect to an optical axis direction, can be reflected toward a diffuser plate by a reflection member. Thereby, the emitted light having a small inclination angle with respect to the optical axis direction and the emitted light having a large inclination angle with respect to the optical axis direction can be mixed, and the occurrence of color unevenness in the diffusion plate can be suppressed.

  As described above, according to the lens and the illumination device of the present invention, it is possible to suppress the light emitted from the light source from being focused on a specific region by the lens, and to prevent occurrence of luminance unevenness.

It is sectional drawing of the light source device (illuminating device) concerning one Embodiment of this invention. FIG. 2 is a perspective view of a lighting fixture including the lighting device shown in FIG. It is sectional drawing of the lighting fixture shown in FIG. It is a perspective view of the light source device (illumination device) shown in FIG. It is explanatory drawing which shows the characteristic of the emitted light of the light source with which the light source device (illuminating device) shown in FIG. 1 is equipped. It is explanatory drawing which showed the one part locus | trajectory of the light radiate | emitted from the light source and reaching | attaining a diffuser plate in the light source device (illuminating device) shown in FIG. 1, and the illuminating device concerning a comparative example. It is sectional drawing of the light source device (illuminating device) concerning other embodiment of this invention. FIG. 8 is an explanatory diagram showing a partial locus of light emitted from the light source and reaching the diffusion plate in the light source device (illumination device) shown in FIG. 7. It is explanatory drawing for demonstrating the problem of a prior art.

  An embodiment of the present invention will be described. In addition, although this embodiment demonstrates the case where this invention is applied to the illuminating device attached to a ceiling, the application object of this invention is not restricted to this, The illuminating device of the structure which light-emits a diffuser plate planarly If applicable.

  FIG. 2 is a perspective view showing an appearance of the lighting fixture 10 according to the present embodiment. As shown in FIG. 2, the lighting fixture 10 includes a ceiling mounting surface 11 having a rectangular shape (long side 1255 mm × short side 255 mm) extending in one direction, and two light emitting surfaces 12 provided on the floor surface side. I have.

  3 is a cross-sectional view of the lighting apparatus 10 taken along the line AA shown in FIG. As shown in FIG. 3, the lighting fixture 10 includes a casing 13 having a substantially trapezoidal cross section, and wiring provided in a substantially central portion in the casing 13 so as to extend along the extending direction of the lighting fixture 10. The storage unit 14 and two light source devices (illumination devices) 20 provided on both sides of the wiring storage unit 14 so as to extend along the extending direction of the lighting fixture 10 are provided.

  Although the material of the housing | casing 13 is not specifically limited, In this embodiment, the housing | casing which consists of aluminum was used. The ceiling mounting surface 11 of the housing 13 is provided with a mounting portion for mounting the lighting fixture 10 on the ceiling, a wiring connection portion for connecting a power supply wiring provided on the ceiling side and a wiring in the lighting fixture 10, and the like. (Both not shown).

  The wiring storage portion 14 stores wiring or the like (not shown) for connecting the power supply wiring disposed on the ceiling side and the light source device 20.

  4 is a perspective view (transparent perspective view) showing a schematic configuration of the light source device 20, and FIG. 1 is a cross-sectional view of the light source device 20 taken along the line BB shown in FIG. In each of these drawings, for convenience of explanation, the light emitting surface side (the surface disposed on the floor surface side of the lighting fixture 10) is drawn so as to face the upper side in the drawings.

  As shown in FIG. 1, the light source device 20 includes a substrate 21, an LED (Light Emitting Diode) 22, a lens 23, a reflection plate 24, and a diffusion plate 25.

  The substrate 21 is a plate-like member provided so as to extend along the extending direction of the light source device 20, and a plurality of LEDs 22 are arranged on the substrate surface of the substrate 21 along the extending direction of the light source device 20 at a predetermined pitch. Is arranged in. The substrate 21 is provided with a control circuit for controlling the lighting state of each LED 22, and this control circuit is connected to the power supply wiring on the ceiling side via the wiring stored in the wiring storage unit 14. Has been. Thereby, the electric power for lighting each LED22 to a control circuit is supplied. Note that part or all of the control circuit may be provided outside the light source device 20 in the housing 13 (for example, the wiring housing portion 14).

  The LEDs (light sources) 22 are provided in the light source device 20 as light sources, and a plurality of LEDs 22 are arranged at a predetermined pitch along the extending direction of the light source device 20 as described above. In addition, although LED is used as a light source in this embodiment, it is not restricted to this, For example, you may use other light sources, such as a fluorescent substance, an electroluminescent (EL) element, a semiconductor light source.

  In the present embodiment, as the LED 22, an LED that emits white light generated by a color mixture of blue light emitted from a blue light emitting element and yellow fluorescence excited by blue light is used. FIG. 5 is an explanatory diagram showing the color characteristics of the emitted light of the LED 22 used in the present embodiment. As shown in this figure, the LED 22 has an emission angle of light with respect to the optical axis Y (the normal direction of the substrate surface of the substrate 21) (in-plane angle of a plane perpendicular to the extending direction of the light source device 20 and including the optical axis Y). The color temperature changes according to the characteristics. Specifically, the color temperature of the emitted light becomes higher (closer to white) as the inclination angle with respect to the optical axis Y becomes smaller, and the color temperature of the emitted light becomes lower (closer to yellow) as the inclination angle with respect to the optical axis Y becomes larger. It has a characteristic. In addition, as shown in FIG. 5, the range of the color temperature of the emitted light of LED22 used by this embodiment is about 4400 degrees-6000 degrees.

  The lens 23 is for diffusing the light incident from the LED 22 by refracting and emitting the light. The lens 23 extends along the extending direction of the light source device 20 and is attached to the substrate 21 so as to cover the plurality of LEDs 22 provided on the substrate 21.

  The lens 23 may be configured to cover the plurality of LEDs (light sources) 22 with a long, integrally molded lens, and the plurality of lenses molded separately from each other. The structure which covers LED22 may be sufficient. For example, one lens (light source) 22 may be provided with one lens, or a plurality of LEDs 22 may be provided with one lens.

  Specifically, as shown in FIG. 1, the lens 23 includes a curved portion 31 that is opposed to the light emitting side of the LED 22 so as to cover the LED 22, and a cross section perpendicular to the extending direction of the lens 23 in the curved portion 31. And a flat plate portion 32 extending substantially parallel to the substrate surface of the substrate 21, extending from the both ends of the lens 21 toward the outside of the lens 23 (in a direction orthogonal to the optical axis Y of the LED 22 and away from the LED 22).

  The curved portion 31 has a concave portion (inner peripheral surface 34) that is recessed toward the light emitting direction side of the LED 22. In addition, end surfaces 36 at both ends of the curved portion 31 in a cross section perpendicular to the extending direction of the lens 23 are lateral positions of the LED 22 on the substrate surface of the substrate 21 (positions in a direction substantially perpendicular to the optical axis Y with respect to the LED 22). It arrange | positions so that it may oppose.

  The flat plate portion 32 is a member for attaching the lens 23 to a mounted member (the substrate 21 in this embodiment) to which the LED (light source) 22 is mounted, and extends from the end face 36 of the curved portion 31 to the outside of the lens 23. It is molded integrally with the bending portion 31 so as to be provided. Note that the surface of the flat plate portion 32 facing the substrate 21 and the end surface 36 of the curved portion 31 are formed on the same surface. The flat plate portion 32 is provided with a screw hole (not shown), and the lens 23 is screwed to the substrate 21 using the screw hole.

  In addition, the flat plate part 32 may be provided in the whole area of the longitudinal direction of the lens 23, and may be provided only in the one part area | region. Further, the flat plate portion 32 is not an essential configuration and may be omitted. For example, the flat plate portion 32 may not be provided, and the end surface 36 of the bending portion 31 may be attached to the attached member by adhesion, welding, fitting, engagement, or the like.

  Moreover, although this embodiment demonstrates the structure which arrange | positions the end surface 36 of the curved part 31 facing the board | substrate (attached member) 21 with which LED22 is mounted | worn, it does not restrict to this. For example, a part or the whole of the end surface 36 of the bending portion 31 is attached to another member to be mounted on which the LED (light source) 22 is mounted directly or indirectly via the substrate 21 or the like (for example, a heat sink or chassis of the light source device 20). ) May be arranged opposite to each other. Similarly, a part or all of the flat plate portion 32 may be disposed opposite to the other mounted member (for example, a heat sink or a chassis of the light source device 20).

  The cross-sectional shape of the outer peripheral surface 33 of the curved portion 31 (the cross-sectional shape of the cross section perpendicular to the extending direction of the light source device 22) is not particularly limited, and may be, for example, a circle, an ellipse, a hyperbola, or other shapes. May be. In addition, it is preferable that the cross-sectional shape of the outer peripheral surface 33 of the curved part 31 is a shape which can radiate | emit so that the light radiate | emitted from LED22 and entered the lens 23 may reach | attain substantially uniformly throughout the diffusion plate 25.

  The cross-sectional shape of the inner peripheral surface 34 of the curved portion 31 (the cross-sectional shape of the cross section perpendicular to the extending direction of the light source device 22) is also substantially uniform over the entire area of the diffuser plate 25 with the light emitted from the LED 22 and incident on the lens 23. It is preferable that the shape can be emitted so as to reach.

  In the present embodiment, the cross-sectional shape of the inner peripheral surface 34 of the bending portion 31 (the cross-sectional shape of the cross section perpendicular to the extending direction of the light source device 22) is the optical axis Y of the LED 22 (the main axis direction of the emitted light from the LED 22). It is set as the shape by which it is set as the shape of a line symmetrical curve, and the recessed part hollow in the light emission direction side of LED22 by the internal peripheral surface 34 is formed. In addition, end surfaces 36 that are substantially parallel to the substrate surface of the substrate 21 are formed at both ends of the bending portion 31 (both ends of the cross section perpendicular to the extending direction of the light source device 22). In addition, the size of the internal space formed between the inner peripheral surface 34 of the bending portion 31 and the substrate 21 is set to be larger than that of a lens provided in a conventional general lighting device. Specifically, the lens 23 has a distance from the center in the substrate surface direction (center of the LED 22 arrangement position) in the cross section of the LED 22 to one end of the end surface 36 on the LED 22 side, and the one on the end surface 36. When the distance from the end of the end surface 36 to the other end of the end face 36 opposite to the LED 22 is b, the shape satisfies the relationship of a> b.

  More specifically, in the cross section perpendicular to the extending direction of the lens 23, the optical axis Y of the LED 22 (the axis passing through the center of the LED 22 in the substrate surface direction of the substrate 21 and perpendicular to the substrate surface of the substrate 21) and the curved portion 31. The distance in the in-plane direction of the end surface 36 from the LED 22 side to the end portion on the LED 22 side (the connection portion between the end portion of the inner peripheral surface 34 on the substrate 21 side and the end surface 36) is a. When the distance in the in-plane direction of the substrate with the far end (the connection portion of the outer peripheral surface 33 of the bending portion 31 with the flat plate portion 32) is b, the cross section of the bending portion 31 satisfies the relationship of a> b. The shape is set.

  Further, if the distance in the normal direction (optical axis direction) between the position on the optical axis Y of the LED 22 on the inner peripheral surface 34 of the curved portion 31 and the surface on the substrate 21 side in the flat plate portion 32 is c, b The cross-sectional shape of the inner peripheral surface of the bending portion 31 is set so as to satisfy the relationship <c.

  Further, in the cross section perpendicular to the extending direction of the lens 23, the entire inner peripheral surface 34 has a curved surface.

  In addition, the tangent line of the inner peripheral surface 34 in a cross section perpendicular to the extending direction of the lens 23 is always inclined with respect to the substrate surface of the substrate 21 except for the position on the optical axis Y of the LED 22 (inner peripheral surface 34). The angle θ between the tangent to the substrate surface of the substrate 21 is a shape in which 0 ° <θ <90 °). In other words, the distance (the distance along the optical axis Y direction) between each position on the inner peripheral surface 34 and the substrate surface of the substrate 21 in the cross section perpendicular to the extending direction of the lens 23 is the substrate surface from the optical axis Y. The distance in the inward direction (distance in the direction perpendicular to the optical axis Y) is always different, and the distance in the substrate plane direction from the optical axis Y of the LED 22 (distance in the direction perpendicular to the optical axis Y). The shape becomes shorter as the length becomes longer. That is, a shape in which a plane portion parallel to the substrate surface of the substrate 21 is not provided in the vicinity of the end portion on the substrate 21 side of the inner peripheral surface 34 of the lens 23 is provided.

  More specifically, in the present embodiment, as shown in FIG. 1, the distance a is 5 mm, the distance b is 3.7 mm, and the distance c is 7.1 mm. In the present embodiment, the distance d in the substrate surface normal direction (optical axis direction) between the position on the optical axis of the LED 22 on the outer peripheral surface 33 of the curved portion 31 and the surface of the flat plate portion 32 on the substrate 21 side is set to 9. 2 mm. Further, the width of the flat plate portion 32 in the in-plane direction of the substrate 21 (width in the direction perpendicular to the extending direction of the lens 23) was 7.55 mm. Further, the thickness of the flat plate portion 32, that is, the width of the flat plate portion 32 in the normal direction of the substrate surface of the substrate 21 was set to 1.3 mm.

  The reflecting plate (reflecting member) 24 is light emitted from the lens 23 to the side of the LED 22, that is, an inclination angle of a predetermined angle or more with respect to the optical axis Y of the LED 22 (an emitting angle close to a direction orthogonal to the optical axis Y). This is for reflecting the light emitted in step 1 toward the diffusion plate 25. Specifically, the reflecting plate 24 is a region connecting an end 41 of the diffusion plate 25 in a direction perpendicular to the extending direction of the light source device 20 and an end 42 of the substrate 21 in the direction perpendicular to the extending direction of the light source device 20. The first reflecting portion 24a provided on the side surface portion of the light source device 20 and the bottom surface of the substrate 21 and the lens 23 (the facing surface of the lens 23 facing the substrate 21, that is, the facing surface of the end surface 36 and the flat plate portion 32 facing the substrate 21). ) And a second reflecting portion 24b provided in the lens mounting portion, which is a region sandwiched between the second reflecting portion 24b and the second reflecting portion 24b.

  That is, the bottom surface of the lens 23 (the end surface 36 and the surface of the flat plate portion 32 facing the substrate 21) is in contact with one surface of the second reflecting portion 24 b of the reflecting plate 24, and the substrate surface of the substrate 21 is the second surface of the reflecting plate 24. 2 is in contact with the other surface of the reflecting portion 24 b, and the bottom surface of the lens 23 (the end surface 36 and the surface of the flat plate portion 32 facing the substrate 21) and the substrate 21 are connected via the second reflecting portion 24 b of the reflecting plate 24. It arrange | positions so that it may oppose.

  In addition, the first reflecting portion 24a emits light from the end portion 42 of the substrate 21 in the direction perpendicular to the extending direction of the light source device 20 toward the end portion 41 of the diffusion plate 25 in the direction perpendicular to the extending direction of the light source device 20. It arrange | positions so that the distance about the direction orthogonal to the said optical axis Y from the axis | shaft Y to the said 1st reflection part 24a may become long.

  In the present embodiment, as shown in FIG. 1, both ends of the cross section perpendicular to the extending direction of the flat reflector extending along the extending direction of the light source device 20 are respectively inclined at an inclination angle of 36 ° and the optical axis of the LED 22. The first reflecting portion 24a and the second reflecting portion 24b arranged on one side with respect to the lens 23 in the cross section, and on the other side, by being bent symmetrically with respect to the diffusion plate 25 side. The first reflecting portion 24a and the second reflecting portion 24b are formed by a single reflecting plate. However, the configuration of the reflector (reflecting member) 24 is not limited to this. For example, in the cross section, the first reflecting portion 24a and the second reflecting portion 24b disposed on one side with respect to the lens 23 are formed of one reflecting plate, and the first reflecting portion 24a disposed on the other side. Alternatively, the second reflecting portion 24b may be formed of another reflecting plate. Moreover, you may comprise the 1st reflection part 24a and the 2nd reflection part 24b with a separate reflecting plate. Moreover, in addition to the 1st reflection part 24a and the 2nd reflection part 24b, the area | region except LED22 is covered among the area | regions exposed in the internal space formed between the curved parts 31 of the lens 23 in the board | substrate 21. FIG. A third reflecting portion (not shown) may be provided. Moreover, this 3rd reflection part may be formed integrally with the 2nd reflection part 24b, and may be formed separately from the 2nd reflection part 24b. The first reflecting portion 24a is not limited to a configuration using a plate-like reflecting member, and has a reflecting surface on the surface on the lens 23 side, and the cross-sectional shape is a triangle, a quadrangle, a trapezoid, or other shapes that are three-dimensional. A reflective member may be used.

  The material of the reflecting plate 24 is not particularly limited, and a known material that has been conventionally used as a reflecting member, such as a metal material such as aluminum or a resin material such as PET (polyethylene terephthalate), can be used. . In this embodiment, a reflector made of PET having a thickness of 0.1 mm is used.

  The diffusion plate 25 has a function as the light emitting surface 12 of the lighting fixture 10, diffuses the light emitted from the LED 22 and reaches the diffusion plate 25, and emits the light to the outside of the lighting fixture 10. The material of the diffusion plate 25 is not particularly limited, and for example, a known material conventionally used as a diffusion plate can be used. In the present embodiment, a diffusion plate made of milky white polycarbonate resin having a thickness of 1.5 mm is used.

  FIG. 6 shows a locus of a part of the light emitted from the light source and reaching the diffusion plate in the light source device 20 according to the present embodiment and the lighting device according to the comparative example (the lighting fixture 100 shown in FIG. 9). FIG.

  6A shows an example in which the mounting position of the lens 103 is a normal design position (default position) in the lighting apparatus 100, and FIG. 6B shows the mounting position of the lens 103. 6 shows an example in which the lens 103 is shifted by 0.5 mm toward the diffusing plate side, and FIG. 6C shows the case where the mounting position of the lens 103 is shifted by 0.5 mm toward the optical axis direction and the substrate side. An example is shown.

  6D shows an example in which the mounting position of the lens 23 in the light source device 20 is a normal design position (default position), and FIG. 6E shows the mounting position of the lens 23. Shows an example in which the lens 23 is shifted by 0.5 mm toward the diffusing plate, and FIG. 6F shows the case where the mounting position of the lens 23 is shifted by 0.5 mm toward the optical axis and the substrate. An example is shown.

  As shown in FIG. 6A, in the lighting fixture 100 according to the comparative example, the end surface of the lens 103 is formed by a flat portion 103 a parallel to the substrate surface of the substrate 101 and a flat portion 103 c connected to the flat plate portion 105. It is configured. The lens 103 has a distance a from the center of the light source 102 to one end on the light source 102 side on the end surface, and the other end on the end surface opposite to the light source 102 from the one end on the end surface. When the distance to is b, the shape satisfies the relationship of a <b. That is, the relationship of a> b is not satisfied as in the lens 23 according to the present embodiment. For this reason, since the distance between the light source 102 and the end face is short and the area of the end face is large, the amount of light emitted from the light source 102 to the side and incident on the end faces (plane portions 103a and 103c) is large. . For this reason, the light incident on the end faces (flat portions 103a and 103c) is condensed on a part of the diffusion plate 104 by the refracting action on the end faces and the lens outer peripheral surface 103b, and bright lines are generated in the diffusion plate 104. It was. Further, the light emitted from the light source 102 to the side is refracted on the end surface and the lens outer peripheral surface 103b from the outer edge portions of the diffusion plate 104 (both ends of the diffusion plate 104 in the direction perpendicular to the extending direction of the luminaire 100). Since the light is condensed in a region close to the central portion, it is difficult for light to reach the outer edge portion of the diffusion plate 104, the luminance of the outer edge portion is lowered, and a dark portion is generated.

  In addition, since the bright line is formed by light emitted from the light source 102 in a direction having a relatively large inclination angle with respect to the optical axis direction and incident on the flat portion 103a, the color temperature is low and the yellow line is visually recognized as yellow. It also caused color unevenness.

  Further, as shown in FIG. 6B, when the mounting position of the lens 103 is shifted to the diffusion plate 104 side, that is, when the lens 103 and the light source 102 are shifted in the direction away from the optical axis direction, Increasing the amount of light incident on the end faces (plane portions 103a and 103c) increases the amount of light collected on a specific area of the diffuser plate 104, and the degree of bright lines becomes significant. The amount of light reaching the outer edge portion 104 is reduced and the dark portion is enlarged.

  Further, as shown in FIG. 6C, when the mounting position of the lens 103 is shifted to the substrate 101 side, that is, when the lens 103 and the light source 102 are shifted in the direction approaching the optical axis direction, the end face By reducing the amount of light incident on the (planar portions 103a and 103c), the amount of light reaching the outer edge of the diffusion plate 104 is increased, and the dark portion is slightly reduced. The amount of light collected was reduced and the bright lines were slightly reduced.

  On the other hand, in the light source device 20 according to the present embodiment, the inner peripheral surface 34 of the lens 23 is formed into a shape satisfying the relationship of a> b as described above, whereby the end surface 36 of the curved portion 31 and the LED 22 are separated. Since the distance is long, the amount of light emitted from the LED 22 to the side (the direction in which the tilt angle (emission angle) with respect to the optical axis Y is greater than or equal to a predetermined angle) and incident on the end face 26 is reduced as compared with the comparative example described above. Can be made. Further, since the width b of the end surface 36 in the substrate surface direction is relatively small with respect to the distance a between the end surface 36 and the LED 22, that is, the area of the end surface 36 is small, the amount of light incident on the end surface 36 is further reduced. be able to. As a result, as shown in FIG. 6D, the light incident on the end surface 36 is condensed on a specific region in the diffusion plate 25 to generate a bright line, or the light incident on the end surface 36 is It is possible to prevent a dark portion from being generated due to a shortage of light that is collected at the center and reaches the outer edge of the diffusion plate 25, and substantially uniform luminance can be realized over the entire area of the diffusion plate 25.

  Further, in the light source device 20 according to the present embodiment, the inner peripheral surface 34 of the lens 23 is shaped to satisfy the relationship b <c as described above. When b> c, the incident angle of the emitted light from the LED 22 with respect to the inner peripheral surface (curved surface) 34 of the lens 23 increases, so that the light incident on the inner peripheral surface (curved surface) 34 of the lens 23 The light is mainly condensed in a region relatively close to the optical axis Y in the diffusion plate 34 due to refraction at. As a result, the amount of light reaching the outer edge portion of the diffusion plate 34 may be reduced, and a dark portion may be generated at the outer edge portion. On the other hand, by setting b <c as in this embodiment, the incident angle of the emitted light from the LED 22 with respect to the inner peripheral surface (curved surface) 34 of the lens 23 can be reduced. As a result, even when the above b> c and the value of a are constant, the light incident on the inner peripheral surface (curved surface) 34 of the lens 23 can be diffused to a wider area in the diffusion plate 34. it can. Thereby, the luminance distribution of the light reaching the diffusion plate 34 can be made more uniform.

  Further, by forming the lens 23 in the above-described shape, as shown in FIG. 6E, even when the mounting position of the lens 23 is slightly shifted toward the diffusion plate 25, the bright line and the dark part are generated. And substantially uniform brightness can be realized over the entire area of the diffusion plate 25.

  Further, as shown in FIG. 6D, the light emitted from the LED 22 is compared with the light emitted in a direction in which the inclination angle with respect to the optical axis direction of the LED 22 is relatively small, that is, the optical axis direction of the LED 22. The light emitted in the direction close to the target is diffused by the lens 23 and dispersed and incident on the entire area of the diffusion plate 25. Further, the light emitted in the direction in which the inclination angle of the LED 22 with respect to the optical axis direction is relatively large, that is, the light emitted to the side of the LED 22 is at a position connecting the end of the diffusion plate 25 and the end of the substrate 21. The light is reflected in the direction of the diffusion plate 25 by the reflection plate 24 arranged so as to be inclined at a predetermined angle (36 ° in this embodiment) with respect to the substrate surface of the substrate 21. Further, since the reflecting surface of the reflecting plate 24 is arranged so as to be inclined at a predetermined angle (36 ° in the present embodiment) with respect to the substrate surface of the substrate 21, the light incident on the reflecting plate 24 is incident on the diffusing plate 25. The light is reflected to the center side of the diffusion plate 25 without being condensed on the outer edge. Thereby, the emitted light from the LED 22 having a relatively small inclination angle with respect to the optical axis direction of the LED 22 and the high color temperature and the emitted light from the LED 22 having a low color temperature reflected by the reflecting plate 24 can be effectively mixed. The occurrence of color unevenness can be prevented.

[Embodiment 2]
Another embodiment of the present invention will be described. For convenience of explanation, members having the same functions as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  FIG. 7 is a cross-sectional view of a cross section perpendicular to the extending direction of the light source device 20b in the light source device (illumination device) 20b according to the present embodiment. The light source device 20b is provided in the lighting fixture 10 in place of the light source device 20 shown in the first embodiment.

  The light source device 20b is different from the light source device 20 in that a lens 23b is provided instead of the lens 23 in the light source device 20 shown in the first embodiment, and the other points are the same as those of the light source device 20. The lens 23b is different from the lens 23 in the first embodiment in that notches (notched surfaces) 35 are provided at both ends of the inner peripheral surface on the substrate 21 side, and the other points are the same as the lens 23. It is the composition.

  As shown in FIG. 7, the notch 35 has both end portions of the inner peripheral surface 34 of the lens 23 used in Embodiment 1 at a position of 1.3 mm from the end portion in the normal direction of the substrate surface of the substrate 21. The substrate 21 has a shape cut (chamfered) along a plane connecting the position of 1.3 mm in the in-plane direction of the substrate 21. That is, the notch 35 is disposed between the curved surface disposed at a position including the optical axis direction of the LED 22 and the end surface 36, and is a planar shape inclined at an angle of 45 ° with respect to the substrate surface of the substrate 21. have. Note that, in the cross section perpendicular to the extending direction of the light source device 20, the end of the notch 35 that is far from the optical axis Y is disposed closer to the substrate 21 than the end that is closer to the optical axis Y. .

  Therefore, the cross-sectional shape of the inner peripheral surface 34 of the lens 23b (the cross-sectional shape of the cross section perpendicular to the extending direction of the light source device 22 on the inner peripheral surface 34) is the optical axis direction of the LED 22 (the main axis direction of the emitted light from the LED 22). As shown in FIG. 4, the curved line portion (curved surface portion) is symmetrical to the curved surface portion, and the straight portion (planar portion) inclined at an angle of 45 ° with respect to the substrate surface of the substrate 21 is provided. The inclination angle of the notch 35 with respect to the substrate surface is not limited to 45 °, and a part of the light incident on the notch 35 from the LED 22 is emitted from the outer peripheral surface 33 of the curved portion 31 to the outside of the lens 23b and remains. May be any angle that can refract the light incident from the LED 22 so as to propagate in the flat plate portion 32. Further, the range of the cutout portion 35 in the normal direction of the substrate surface is not particularly limited, but it is preferably about the same as the thickness of the flat plate portion 32. Further, the shape of the notch 35 is not limited to a shape that becomes a straight portion (plane portion) in the cross-sectional shape as long as the shape is inclined with respect to the substrate surface of the substrate 21, and is a curved shape (curved surface). Also good.

  Specifically, in the present embodiment, as shown in FIG. 7, in the cross section perpendicular to the extending direction of the lens 23 b, the optical axis Y of the LED 22 (through the center of the LED 22 in the substrate surface direction of the substrate 21) Between the end surface 36 of the curved portion 31 on the LED 22 side (the end portion on the substrate 21 side of the inner peripheral surface 34 (the end portion on the substrate 21 side of the notch 35)) and the end surface 36. The distance in the in-plane direction of the substrate 21 with respect to the connection portion), a on the LED 22 side end of the end surface 36 of the bending portion 31 (end on the substrate 21 side of the notch 35) and the end surface 36 of the bending portion 31. Assuming that the distance in the in-plane direction of the substrate 21 from the end opposite to the LED 22 (the connecting portion of the outer peripheral surface 33 of the curved portion 31 to the flat plate portion 32) is b, the relationship of a> b is satisfied. Curved portion 31 It has set up a cross-sectional shape. Further, if the distance in the normal direction of the substrate surface (optical axis direction) between the position on the optical axis of the LED 22 on the inner peripheral surface 34 of the curved portion 31 and the surface of the flat plate portion 32 on the substrate 21 side is c, b < The cross-sectional shape of the inner peripheral surface of the bending portion 31 is set so as to satisfy the relationship c.

  More specifically, in the present embodiment, as shown in FIG. 7, the distance a is 6.3 mm, the distance b is 2.4 mm, and the distance c is 7.1 mm. In the present embodiment, the distance d in the substrate surface normal direction (optical axis direction) between the position on the optical axis of the LED 22 on the outer peripheral surface 33 of the curved portion 31 and the surface of the flat plate portion 32 on the substrate 21 side is set to 9. 2 mm. Further, the width of the flat plate portion 32 in the in-plane direction of the substrate 21 (width in the direction perpendicular to the extending direction of the lens 23) was 7.55 mm. Further, the thickness of the flat plate portion 32, that is, the width of the flat plate portion 32 in the normal direction of the substrate surface of the substrate 21 was set to 1.3 mm.

  In the present embodiment, the cross-sectional shape of the inner peripheral surface 34 of the lens 23 is perpendicular to the extending direction of the lens 23, and the tangent line of the inner peripheral surface 34 (including the notch 35) in the cross-section is on the optical axis of the LED 22. The shape is always inclined with respect to the substrate surface of the substrate 21 except for the position (the shape in which the angle θ formed between the tangent to the inner peripheral surface 34 and the substrate surface of the substrate 21 is 0 ° <θ <90 °). . In other words, the distance (the distance along the optical axis Y direction) between each position on the inner peripheral surface 34 (including the cutout portion 35) and the substrate surface of the substrate 21 in a cross section perpendicular to the extending direction of the lens 23 is The distance from the optical axis Y in the in-plane direction of the substrate (distance in the direction perpendicular to the optical axis Y) is always different, and shorter as the distance from the optical axis Y of the LED 22 in the in-plane direction of the substrate becomes longer. The shape is. That is, a shape in which a plane portion parallel to the substrate surface of the substrate 21 is not provided in the vicinity of the end portion of the inner peripheral surface 34 of the lens 23 is used.

  FIG. 8 is an explanatory diagram showing a part of the locus of light emitted from the LED 22 and reaching the diffusion plate 25 in the light source device 20b according to the present embodiment.

  As shown in FIG. 8, since the lens 23b according to the present embodiment includes the cutout portion 35, the distance a between the center of the LED 22 and the end portion on the LED 22 side of the end surface 36 is larger than that of the lens 23 in the first embodiment. Furthermore, the distance (width of the end surface 36) b between the end of the end surface 36 on the LED 22 side and the end of the end 36 opposite to the LED 22 (width of the end surface 36) is shorter than that of the lens 23 in the first embodiment. That is, the distance between the end face 36 and the LED 22 is longer than that of the lens 23 in the first embodiment, and the area of the end face 36 is further smaller than that of the lens 23 in the first embodiment. Thereby, the light emitted from the LED 22 and incident on the end face 36 can be further reduced as compared with the first embodiment. Therefore, it is more appropriate that the light incident on the end face 36 is condensed on a specific region in the diffusion plate 25 to generate a bright line, or the light reaching the outer edge of the diffusion plate 25 is reduced and a dark portion is generated. Can be prevented.

  Further, as shown in FIG. 8, in the light source device 20b according to the present embodiment, a notch 35 inclined at a predetermined angle with respect to the substrate surface of the substrate 21 is provided at the end of the inner peripheral surface 34 of the lens 23b. ing. Thereby, when the cutout portion 35 is not provided, a part of the light incident on the flat plate portion 32 approaches the optical axis Y when entering the cutout portion 35 because the cutout portion 35 is provided. Since the light is refracted in the direction, the light is emitted from the outer peripheral surface 33 of the bending portion 31 without being incident on the flat plate portion 32.

  For this reason, when the cutout portion 35 is not provided, the light is emitted from the flat plate portion 32 to the reflection plate 24 and is condensed by the reflection plate 24 onto a partial region in the vicinity of the central portion of the diffusion plate 25 in the substrate plane direction. A part of the light that has been transmitted can reach the vicinity of both end portions (outer edge portions) of the diffusion plate 25 in the in-plane direction of the substrate without passing through the flat plate portion 32.

  Therefore, it is possible to prevent the bright line from being generated in the vicinity of the central portion in the cross section perpendicular to the extending direction of the light source device 20 in the diffusion plate 25, and to prevent the dark portion from being generated due to the decrease in luminance near the end of the cross section. And uneven brightness can be prevented more effectively.

  When the notch 35 is not provided, light having a low color temperature emitted from the LED 22 in a direction having a relatively large inclination angle with respect to the optical axis direction is emitted from the flat plate portion 32 to the reflective plate 24. As a result, the light is concentrated on a part of the diffuser plate 25 in the vicinity of the central portion in the in-plane direction of the substrate. On the other hand, according to the above configuration, when the notch portion 35 is not provided, the light is emitted from the flat plate portion 32 to the reflection plate 24, and is reflected by the reflection plate 24 in the vicinity of the center portion in the substrate in-plane direction of the diffusion plate 25. A part of the light condensed in a part of the region can reach the vicinity of both ends of the diffusion plate 25 in the in-plane direction of the substrate without passing through the flat plate part 32. Therefore, it is possible to prevent light having a low color temperature from being focused on a specific region in the diffusion plate 25 and to prevent color unevenness from occurring more effectively.

  As described above, in the light source device 20 according to each of the embodiments described above, the shape of the inner peripheral surface 34 in the cross section perpendicular to the extending direction of the lens 23 is the center portion of the LED 22 in the substrate surface in the substrate surface direction and the curved portion 31. The distance between the inner peripheral surface 34 of the inner peripheral surface 34 and the end of the substrate 21 in the substrate surface direction is a, the end of the inner peripheral surface 34 of the bending portion 31 on the substrate 21 side, and the outer peripheral surface 33 of the bending portion 31. When the distance in the substrate in-plane direction of the substrate 21 with the connecting portion with the flat plate portion 32 is b, the relationship of a> b is set. In other words, the lens 23 is disposed so as to face the LED (light source) 22, and includes a curved portion 31 having a concave portion recessed on the light emission direction side of the LED 22, and the curved portion 31 is mounted with the LED 22. It has an end face 36 that faces a position different from the position where the LEDs 22 are arranged on the surface of the substrate (attached member) 21. The end surface 36 is a distance from the center of the LED 22 arrangement position to the LED 22 side end of the end surface 36, and a distance from the LED 22 side end of the end surface 36 to the opposite end of the LED 22 is b. The shape satisfies the relationship of a> b.

  Thereby, it is possible to prevent the light from being focused on a specific area in the diffusion plate 25 and to prevent uneven brightness.

  In each of the above-described embodiments, the configuration in which the position on the optical axis of the light emitted from the LED 22 on the inner peripheral surface of the lenses 23 and 23b is a curved shape has been described. Any configuration that satisfies the relationship of a> b may be used. Similarly to Patent Document 1, an optical function unit that scatters or diffuses the light emitted from the LED 22 may be provided at a position on the optical axis of the light emitted from the LED 22 on the inner peripheral surfaces of the lenses 23 and 23b. . The optical function unit may be formed, for example, by printing a material having light diffusibility on the inner peripheral surfaces of the lenses 23 and 23a, and processing the inner peripheral surfaces of the lenses 23 and 23a by laser processing or the like ( For example, it may be formed by performing roughening treatment or the like.

  Moreover, although each said embodiment demonstrated the light source device 20 and 20b which has a shape extended | stretched to one direction, the application object of this invention is not restricted to this, For example, it is an axis | shaft with respect to the optical axis direction of a light source. The present invention can be applied to a light source device having a symmetric shape.

  Moreover, although each said embodiment demonstrated the example in the case of applying this invention to the illuminating device with which a ceiling is equipped, the application object of this invention is not restricted to this. For example, the present invention can be applied to a lighting device provided on a wall surface or a floor surface, a stand-type lighting device disposed on a floor surface or a table, or a backlight (lighting device) provided in a liquid crystal display device.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope shown in the claims. That is, embodiments obtained by combining technical means appropriately modified within the scope of the claims are also included in the technical scope of the present invention.

  The present invention can be applied to a lens that diffuses light emitted from a light source and an illumination device including the lens.

10 Lighting fixtures 20, 20b Light source device (lighting device)
21 Substrate 22 LED (light source)
23, 23b Lens 24 Reflector (reflective member)
24a 1st reflection part (reflection member)
24b 2nd reflection part 25 Diffusing plate 31 Bending part 32 Flat plate part 33 Outer peripheral surface 34 Inner peripheral surface 35 Notch part (notch surface)
36 End Y Optical axis

Claims (8)

A lens that refracts and emits light incident from a light source,
It is arranged so as to face the light source, and includes a curved portion having a concave portion recessed on the light emission direction side of the light source,
The curved portion has an end surface facing a position different from the position of the light source on the surface of the mounted member on which the light source is mounted,
When the distance from the center of the arrangement position of the light source to the end of the end surface on the light source side is a, and the distance from the end of the light source to the end opposite to the light source is b, a> satisfy the relationship of b,
An inner peripheral surface that is a surface on the light source side in the curved portion is a curved surface disposed at a position including the optical axis direction of the light source, and the end surface disposed between the end surface and the curved surface. It consists of a notched surface that is inclined with respect to the
A flat plate portion having a surface provided on the outer peripheral surface side of the curved portion and extending from the end surface so as to face the mounted member;
The flat plate portion is thinner than the curved portion,
The lens according to claim 1, wherein an outer peripheral surface of the curved portion is a curved surface convex toward the light emission direction of the light source.   An illumination device comprising: a light source; a member to which the light source is mounted; and the lens according to claim 1.   A diffusion plate disposed opposite to the surface of the lens opposite to the light source is provided, and the light emitted from the light source is diffused by the lens and incident on the diffusion plate to make the diffusion plate planar. The illumination device according to claim 2, wherein the illumination device emits light.   A reflection surface for reflecting light emitted from the light source at an inclination angle of a predetermined angle or more with respect to the optical axis direction of the light source toward the diffusion plate between the mounted member and the diffusion plate. The illuminating device according to claim 3, further comprising a reflecting member having the same. An illumination device comprising a light source, a mounted member on which the light source is mounted, and a lens that refracts and emits light incident from the light source,
A diffusion plate disposed opposite to the surface of the lens opposite to the light source is provided, and the light emitted from the light source is diffused by the lens and incident on the diffusion plate to make the diffusion plate planar. To emit light,
A reflection surface for reflecting light emitted from the light source at an inclination angle of a predetermined angle or more with respect to the optical axis direction of the light source toward the diffusion plate between the mounted member and the diffusion plate. A reflective member having
The above lens
It is arranged so as to face the light source, and includes a curved portion having a concave portion recessed on the light emission direction side of the light source,
The curved portion has an end surface facing a position different from the position of the light source on the surface of the mounted member on which the light source is mounted,
When the distance from the center of the arrangement position of the light source to the end of the end surface on the light source side is a, and the distance from the end of the light source to the end opposite to the light source is b, a> satisfy the relationship of b,
An inner peripheral surface that is a surface on the light source side in the curved portion is a curved surface that is disposed at a position including the optical axis of the light source, and the end surface that is disposed between the end surface and the curved surface. And a notched surface that is inclined and
A flat plate portion provided on the outer peripheral surface side of the curved portion and having a surface extending from the end surface so as to face the mounted member;
The thickness of the flat plate portion is thinner than the thickness of the upper Symbol curved portion,
The inclination angle of the notch surface with respect to the end surface is such that a part of the light emitted from the light source and incident into the lens from the notch surface is emitted from the outer peripheral surface of the curved portion to the outside of the lens, and from the light source. It is an angle at which another part of the light that is emitted and enters the lens from the notch surface is emitted to the outside of the lens through the flat plate portion, and the curved portion through the notch surface. The angle at which light emitted from the outer peripheral surface to the outside of the lens reaches a predetermined range including the outer edge of the diffuser plate,
The shape of the reflecting surface of the reflecting member is such that at least a part of the reach range of the light emitted from the flat plate portion through the notch surface to the diffuser plate is more than the region of the predetermined range in the diffuser plate. An illuminating device having a shape that reflects light emitted from the flat plate portion through the notch surface so as to be on the optical axis direction side of the light source. An illumination device comprising a light source, a mounted member on which the light source is mounted, and a lens that refracts and emits light incident from the light source,
A diffusion plate disposed opposite to the surface of the lens opposite to the light source is provided, and the light emitted from the light source is diffused by the lens and incident on the diffusion plate to make the diffusion plate planar. To emit light,
A reflection surface for reflecting light emitted from the light source at an inclination angle of a predetermined angle or more with respect to the optical axis direction of the light source toward the diffusion plate between the mounted member and the diffusion plate. A reflective member having
The above lens
It is arranged so as to face the light source, and includes a curved portion having a concave portion recessed on the light emission direction side of the light source,
The curved portion has an end surface facing a position different from the position of the light source on the surface of the mounted member on which the light source is mounted,
When the distance from the center of the arrangement position of the light source to the end of the end surface on the light source side is a, and the distance from the end of the light source to the end opposite to the light source is b, a> satisfy the relationship of b,
An inner peripheral surface that is a surface on the light source side in the curved portion is a curved surface that is disposed at a position including the optical axis of the light source, and the end surface that is disposed between the end surface and the curved surface. And a notched surface that is inclined and
A flat plate portion provided on the outer peripheral surface side of the curved portion and having a surface extending from the end surface so as to face the mounted member;
The inclination angle of the notch surface with respect to the end surface is such that a part of the light emitted from the light source and incident into the lens from the notch surface is emitted from the outer peripheral surface of the curved portion to the outside of the lens, and from the light source. It is an angle at which another part of the light that is emitted and enters the lens from the notch surface is emitted to the outside of the lens through the flat plate portion, and the curved portion through the notch surface. The angle at which light emitted from the outer peripheral surface to the outside of the lens reaches a predetermined range including the outer edge of the diffuser plate,
The shape of the reflecting surface of the reflecting member is such that at least a part of the reach range of the light emitted from the flat plate portion through the notch surface to the diffuser plate is more than the region of the predetermined range in the diffuser plate. An illuminating device having a shape that reflects light emitted from the flat plate portion through the notch surface so as to be on the optical axis direction side of the light source.   The lighting device according to claim 4, wherein the reflection surface is inclined with respect to a surface of the mounted member that faces the end surface.   The illumination device according to any one of claims 4 to 7, wherein the light source has an emitted light characteristic in which a color temperature of the emitted light changes in accordance with an inclination angle with respect to an optical axis direction.