Light source device

Abstract

To provide a light source device capable of irradiating a desired irradiation region with a sufficient amount of light.SOLUTION: A light source device for irradiating two or more irradiation regions with light includes a plurality of light emitting units each having a light emitting surface on an upper surface thereof, optical lenses that correspond to the plurality of light emitting units respectively, have a first surface which contains a plurality of incident regions to which light emitted from the light emitting units is incident and are located on a light emitting surface side of the light emitting units, and a second surface which contains a plurality of emission regions corresponding to the plurality of incident regions respectively, and are located on the opposite side to the first surface, and are located above the light emitting surfaces of the light emitting units, and light converging units which correspond to the plurality of light emitting units respectively, have a plurality of light entering portions covering the light emitting surfaces of the light emitting units, and light exiting portions which are provided to correspond to the plurality of light entering units respectively, each light exiting portion having an area smaller than the area of each of the light entering portions, and each light converging unit being located between the light emitting unit and the optical lens.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a light source device. [Background technology]

[0002] In recent years, light sources using multiple light-emitting elements such as light-emitting diodes have come into widespread use. For example, Patent Document 1 discloses a light source that can be used for the flash of a small camera such as a camera mounted on a mobile phone. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5275557 Summary of the Invention [Problem to be solved by the invention]

[0004] Such a light source used for, for example, a camera flash is required to irradiate a desired irradiation area, among the individual irradiation areas obtained by dividing the entire irradiation area, with a sufficient amount of light.

[0005] In view of the above, an object of the present disclosure is to provide a light source device that can irradiate a desired irradiation area with a sufficient amount of light. [Means for solving the problem]

[0006] A light source device according to one embodiment of the present disclosure is a light source device for irradiating light to two or more irradiation regions, comprising: a plurality of light-emitting units having a light-emitting surface on an upper surface; a first surface located on the light-emitting surface side of the light-emitting units, the first surface including a plurality of entrance regions corresponding to each of the plurality of light-emitting units and into which light emitted from the light-emitting units is incident; and a second surface located opposite the first surface and including a plurality of exit regions corresponding to each of the plurality of entrance regions; an optical lens located above the light-emitting surface of the light-emitting units; a plurality of light entrance sections provided corresponding to each of the plurality of light-emitting units and covering the light-emitting surface of the light-emitting units; and a light exit section provided corresponding to each of the plurality of light entrance sections and having an area smaller than an area of ​​the light entrance sections; and a light converging section located between the light-emitting units and the optical lens.

[0007] Furthermore, a light source device according to one embodiment of the present disclosure is a light source device for irradiating light to two or more irradiation regions, comprising: a plurality of light-emitting units having a light-emitting surface on an upper surface; an optical lens located above the light-emitting surfaces of the light-emitting units and having a first surface including a first entrance region and a second surface including a first exit region; a plurality of light entrance sections provided corresponding to each of the plurality of light-emitting units and covering the light-emitting surface of the light-emitting units; and a plurality of light exit sections provided corresponding to each of the plurality of light entrance sections and having an area smaller than an area of ​​the light entrance sections, and a light converging section located between the light-emitting units and the optical lens. Effect of the Invention

[0008] A light source device according to an embodiment of the present disclosure can irradiate a desired illumination area with a sufficient amount of light. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view of a flash light source according to a first embodiment of the present disclosure. [Figure 2A] 2 is a top view of light-emitting parts of the flash light source shown in FIG. 1, illustrating the arrangement of the light-emitting parts. FIG. [Figure 2B] 2 is a top view of light-emitting parts in the flash light source shown in FIG. 1, in which the dimensions of the light-emitting surface differ from one light-emitting part to another. [Figure 2C] 2 is a top view of light-emitting parts in the flash light source shown in FIG. 1, in which the dimensions of the light-emitting surface differ from one light-emitting part to another. [Diagram 3] 2 is a diagram illustrating the relationship between a light-emitting portion of a flash light source shown in FIG. 1 and an illumination area provided corresponding to the light-emitting portion. FIG. [Figure 4A] 2 is a cross-sectional view taken along line AA of the flash light source shown in FIG. [Figure 4B] 2 is another cross-sectional view taken along line AA in the flash light source shown in FIG. 1, in which the central axes of all unit light converging portions are parallel to the optical axis of the optical lens. FIG. [Figure 4C] FIG. 4B is an enlarged view of a portion of the cross-sectional view shown in FIG. 4A. [Diagram 5] 4B is an enlarged cross-sectional view of a light emitting portion, a light converging portion, and a first lens in the cross-sectional view shown in FIG. 4A. [Figure 6A] FIG. 4B is an enlarged view of a portion of FIG. 4A, showing how light from the central light emitting portion enters the optical lens via the central unit light converging portion and the central unit first lens. [Figure 6B] In the cross-sectional view shown in FIG. 4A, a state in which light emitted from a central unit first lens illuminates a corresponding illumination area via an optical lens is shown. [Figure 7A] FIG. 4B is an enlarged view of a portion of FIG. 4A, showing how light from the peripheral light emitting portion enters the optical lens via the peripheral unit light converging portion and the peripheral unit first lens. [Figure 7B] The cross-sectional view shown in FIG. 4A shows how light emitted from a peripheral unit first lens illuminates a corresponding illumination area via an optical lens. [Figure 8] FIG. 11 is a cross-sectional view of a flash light source according to a second embodiment of the present disclosure. [Figure 9] FIG. 11 is a cross-sectional view of a flash light source according to a third embodiment of the present disclosure. [Figure 10] 11 is a cross-sectional view of a flash light source according to a first modified example of the present disclosure. FIG. [Figure 11] 11 is a cross-sectional view of a flash light source according to a second modified example of the present disclosure. [Figure 12] 11 is a cross-sectional view of a flash light source according to a third modified example of the present disclosure. FIG. [Figure 13] 13 is a cross-sectional view of a flash light source according to a fourth modified example of the present disclosure. FIG. [Figure 14] 13 is a cross-sectional view of a flash light source according to a fifth modified example of the present disclosure. FIG. [Figure 15] 13 is a cross-sectional view of a unit light converging portion and a unit first lens included in a flash light source according to a sixth modification of the present disclosure. FIG. [Figure 16] 13 is a cross-sectional view of a flash light source according to a seventh modification of the present disclosure. FIG. [Figure 17] FIG. 13 is a cross-sectional view of a flash light source according to another modified example of the present disclosure. [Figure 18] FIG. 13 is a cross-sectional view of a flash light source according to another modified example of the present disclosure. [Figure 19] FIG. 13 is a cross-sectional view of a flash light source according to another modified example of the present disclosure. [Figure 20] 2 is a diagram showing the minimum distance L, the minimum distance x, and an angle α in the flash light source shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, embodiments and examples for carrying out the present disclosure will be described with reference to the drawings. Note that the flash light source, which is an example of a light source device according to the present disclosure, is intended to embody the technical idea of ​​the present disclosure, and unless otherwise specified, the present disclosure is not limited to the following. In each drawing, components having the same function may be given the same symbol. In consideration of the explanation or ease of understanding of the main points, the embodiments and examples may be shown separately for convenience, but partial replacement or combination of the configurations shown in different embodiments and examples is possible. In the embodiments and examples described below, descriptions of matters common to the above will be omitted, and only the differences will be described. In particular, similar effects due to similar configurations will not be mentioned in each embodiment or example. The size and positional relationship of the components shown in each drawing may be exaggerated to clarify the explanation.

[0011] For example, in the case of a light source for a camera flash, the greater the number of divisions into which the entire illumination area is divided, the more precisely it becomes possible to distinguish between illumination areas that are illuminated with light and illumination areas that are not illuminated with light, thereby enabling a photograph in which the subject is captured more clearly. However, when the number of divisions is increased and the entire irradiation area is divided into smaller parts, the range of each irradiation area becomes smaller, making it difficult to focus the light emitted from each light-emitting unit on the desired irradiation area using an optical lens (e.g., a camera lens), and making it difficult to irradiate the desired irradiation area with a sufficient amount of light. The inventors have made extensive research to solve this problem.

[0012] As a result, the inventors (1) It has been found that by collecting light emitted from a light-emitting portion and increasing the amount of light per unit area, it is possible to increase the brightness of the light irradiating a desired irradiation area. (2) We discovered that by using another lens (first lens) in addition to the optical lens to narrow the full angle at half maximum (directional full angle at half maximum) of the light emitted from each light-emitting element described above in (1) and impart directionality to the light entering the optical lens, the desired irradiation area can be irradiated with a sufficient amount of light.

[0013] A light source device according to one embodiment of the present disclosure has been made based on the above findings, and is a light source device for irradiating light to two or more irradiation regions, and comprises: a plurality of light-emitting units having a light-emitting surface on an upper surface; a first surface located on the light-emitting surface side of the light-emitting units, the first surface corresponding to each of the plurality of light-emitting units and including a plurality of entrance regions into which light emitted from the light-emitting units is incident; and a second surface located opposite the first surface and including a plurality of exit regions corresponding to each of the plurality of entrance regions; an optical lens located above the light-emitting surface of the light-emitting units; a plurality of light entrance sections provided corresponding to each of the plurality of light-emitting units and covering the light-emitting surface of the light-emitting units, and a light exit section provided corresponding to each of the plurality of light entrance sections and having an area smaller than the area of ​​the light entrance sections; and a light converging section located between the light-emitting units and the optical lens.

[0014] Furthermore, a light source device according to another embodiment of the present disclosure has been made based on the above findings, and is a light source device for irradiating light to two or more irradiation regions, and includes: a plurality of light-emitting units having a light-emitting surface on an upper surface; an optical lens located above the light-emitting surface of the light-emitting units and having a first surface including a first entrance region and a second surface including a first exit region; a plurality of light entrance units provided corresponding to each of the plurality of light-emitting units and covering the light-emitting surface of the light-emitting units, and a plurality of light exit units provided corresponding to each of the plurality of light entrance units and having an area smaller than the area of ​​the light entrance units; and a light converging unit located between the light-emitting units and the optical lens.

[0015] Embodiment 1. Embodiment 1 Hereinafter, as an example of a light source device according to the present disclosure, a flash light source according to a first embodiment of the present disclosure will be described with reference to the drawings. The light source 1 according to the present embodiment is a light source for irradiating two or more irradiation regions with light emitted from a light-emitting unit. Here, the irradiation region is a region having a certain direction as a center and a surrounding area. In the present embodiment, the two or more irradiation regions are regions in which the centers of the individual irradiation regions are separated by a predetermined distance, have a predetermined size, and are individually irradiated with the light emitted from the light-emitting unit when the two or more light-emitting units are individually turned on. Also, it means that the light emitted from the two or more light-emitting units is not collected and irradiated, but is each an area individually irradiated with the light emitted from the two or more light-emitting units. In the light source 1 according to the present embodiment, as described later, a plurality of light-emitting units are provided so as to correspond to a plurality of irradiation regions having different directions. As a result, it is possible to irradiate light to a desired irradiation region by selecting and turning on one or more of the plurality of light-emitting units. As shown in FIG. 1 and FIG. 4A, the light source 1 includes a substrate 2, 25 light-emitting units 41, a light converging unit 70, a first lens 10, and an optical lens 30. The optical lens 30 collects or projects the light emitted from the light emitting section 41 toward the corresponding irradiation area. The 25 light emitting portions 41 are arranged on the upper surface 2 a of the substrate 2 . The light converging section 70 includes 25 unit light converging sections 75, each of which has a light entrance section 71 that corresponds to each light-emitting section 41 and covers the light-emitting surface 41a of each light-emitting section 41, and a light exit section 72 that corresponds to each light entrance section 71 and has an area smaller than the area of ​​each light entrance section 71. The first lenses 10 are provided corresponding to the unit light converging portions 75 and include 25 unit first lenses 11 covering the light exit portions 72 of the unit light converging portions 75 . The optical lens 30 is disposed above the light-emitting surface 41a of the light-emitting unit 41. The optical lens 30 has a first surface 31 on the light-emitting surface 41a side of the light-emitting unit 41, and a second surface 32 on the opposite side to the first surface 31. The first surface 31 corresponds to each of the light-emitting units 41 and includes a plurality of entrance regions 33 into which light emitted from the light-emitting units is incident. The second surface 32 includes a plurality of exit regions 34 corresponding to each of the entrance regions 33. Note that the entrance regions 33 and exit regions 34 shown in the figure are exaggerated to show the areas. The light emitted from each light-emitting section 41 enters the optical lens 30 via the light converging section 70 and the first lens 10, and then exits the optical lens 30 to irradiate the irradiation areas arranged corresponding to each light-emitting section 41. In this embodiment, the frame 3 that covers the 25 light emitting portions 41, the light converging portion 70, the first lens 10, and the optical lens 30 is disposed on the upper surface 2a of the substrate 2. In order to facilitate understanding of the internal structure of the light source 1, the optical lens 30 and the frame 3 in FIG. 1 are shown in cross section with some parts omitted.

[0016] Here, for example, the unit light converging section 75 being provided in "correspondence" to the light emitting section 41 means that the unit light converging section 75 is provided in a one-to-one relationship with the light emitting section 41 so that the light emitted from the light emitting section 41 enters through the light entrance section 71 and exits from the light exit section 72 toward the optical lens 30 or the unit first lens 11. Also, for example, the exit area 34 "corresponding" to the entrance area 33 means an area that causes the light that entered the optical lens 30 from the entrance area 33 to exit to the outside of the optical lens 30, and is provided in a one-to-one relationship with the entrance area 33. Furthermore, for example, the irradiation area "corresponding" to the light emitting section 41 means an area that is an area that is an irradiation target of the light emitted from the light emitting section 41, and is provided in a one-to-one relationship with the light emitting section 41. In this specification, "corresponding" means a relationship between components, regions, or regions that are related to each other.

[0017] (Arrangement of light-emitting parts) As shown in FIG. 2A, the 25 light-emitting sections 41 are arranged in a matrix of 5 rows and 5 columns. The light-emitting section located at the center of the 25 light-emitting sections 41 is the central light-emitting section 50 arranged in the 3rd row and 3rd column. In this embodiment, the shape of each light-emitting section 41 (including the central light-emitting section 50) is a square when viewed from above, and adjacent light-emitting sections 41 are arranged in contact with each other, but this is not limited to this. For example, the shape of the light-emitting section 41 when viewed from above may be a rectangle, a circle, a polygon, or the like. For example, adjacent light-emitting sections 41 may be arranged at a distance from each other. In addition, the shape of the light-emitting surface 41a of each light-emitting section 41 when viewed from above may be similar. For example, as shown in FIG. 2B, the size of the light-emitting surfaces 50A1, 41a1, and 41a2 may be made smaller as the distance from the central light-emitting section 50A increases. In addition, for example, as shown in FIG. 2C, the size of the light-emitting surfaces 50B1, 41b1, and 41b2 may be made larger as the distance from the central light-emitting section 50B increases. That is, the size of the light-emitting surface 41a of each light-emitting unit 41 may differ depending on the location of the light-emitting unit 41 in the matrix arrangement. Here, the light-emitting unit 41 disposed farther from the optical axis of the optical lens 30 has a longer distance to the corresponding irradiation area, so that it is difficult to control the light distribution and the loss of light tends to be large. Therefore, as shown in FIG. 2C, by making the light-emitting surfaces 41b1 and 41b2 larger for the light-emitting units 41 farther from the central light-emitting unit 50B, the amount of light in the light-emitting units 41 farther from the central light-emitting unit 50B can be increased, and the decrease in brightness can be suppressed. Furthermore, the number of the light emitting units 41 is not limited to 25, but may be 2 or more. Furthermore, the arrangement of the plurality of light emitting units 41 is not limited to a matrix of m rows and m columns (m≧2), but may be a matrix of m rows and n columns (m≧1, n≧2, m≠n), or may be an arrangement that is not a matrix. For example, four light emitting units 41 may be arranged in two rows and two columns, and 12 other light emitting units 41 may be arranged on the periphery of the four light emitting units 41, with four on each side, and 8 other light emitting units 41 may be arranged on the periphery, with two on each side excluding the corners. This allows the plurality of light emitting units 41 to be arranged in a shape close to a circle in a plan view, and by making the optical lens 30 circular in a plan view, the light from the plurality of light emitting units 41 can be efficiently incident on the optical lens 30. The number of central light emitting units may be 2 or more depending on the number of light emitting units 41 and / or the arrangement of the light emitting units 41. Furthermore, the distance between adjacent light emitting units 41 or between adjacent light emitting surfaces 41a may be different. In other words, the distance between two adjacent light-emitting sections 41 or two adjacent light-emitting surfaces 41a in the row direction may be shorter than the distance between two adjacent light-emitting sections 41 or two adjacent light-emitting surfaces 41a in the column direction.

[0018] (Arrangement of irradiation areas) As shown in Fig. 3, the light source 1 according to this embodiment irradiates light to an area R1 divided into 25 irradiation areas. The area R1 and each irradiation area shown in the figure are drawn in a schematic plan view to facilitate understanding of the contents of the invention. The 25 irradiation areas are arranged in a matrix of 5 rows and 5 columns. One irradiation area is provided corresponding to one light-emitting unit 41, and is irradiated with light emitted from the corresponding light-emitting unit 41. In this embodiment, 25 irradiation regions are arranged in a matrix, but the arrangement is not limited to this. For example, the number of irradiation regions may be two or more. However, it is preferable that the number of irradiation regions is the same as the number of light-emitting units 41. Furthermore, the arrangement of the multiple irradiation regions is not limited to a matrix of i rows and i columns (i≧2), but may be a matrix of i rows and j columns (i≧1, j≧2, i≠j), or may be an arrangement that is not a matrix. However, it is preferable that the arrangement of the irradiation regions is the same as the arrangement of the light-emitting units 41.

[0019] (Arrangement of the light-emitting part and the irradiation area) In this embodiment, as shown in FIG. 3, the arrangement relationship between each light-emitting unit 41 and the irradiation area corresponding to the light-emitting unit is point-symmetrical with respect to a point O located directly above the midpoint P of the light-emitting surface 50a of the central light-emitting unit 50. That is, each light-emitting unit 41 and the irradiation area irradiated with light emitted from the light-emitting unit are arranged in a point-symmetrical arrangement relationship with respect to a point unique to the light-emitting unit 41, and the unique point of each of the multiple light-emitting units is the same point (point O). For example, the irradiation area R33 arranged in the third row and third column of the 25 irradiation areas is an irradiation area corresponding to the central light-emitting unit 50 arranged in the third row and third column of the 25 light-emitting units 41. For example, the irradiation area R35 arranged in the third row and fifth column of the 25 irradiation areas is an irradiation area corresponding to the light-emitting unit 55 arranged in the third row and first column of the 25 light-emitting units 41. For example, the irradiation area R42 arranged in the fourth row and second column of the 25 irradiation areas is an irradiation area corresponding to the light-emitting unit 60 arranged in the second row and fourth column of the 25 light-emitting units 41. As described above, the light-emitting unit 41 and the corresponding irradiation area are provided in a one-to-one relationship, but this is not limited to the fact that the light emitted from the light-emitting unit 41 actually irradiates only the corresponding irradiation area. The irradiation area corresponding to the light-emitting unit 41 is the irradiation area that the light-emitting unit 41 is intended to irradiate. Therefore, in reality, the light emitted from one light-emitting unit 41 may also irradiate an adjacent irradiation area (or a nearby irradiation area). In other words, as shown in FIG. 3, one irradiation area may include an area (first irradiation area) R1A irradiated only by the light emitted from the corresponding light-emitting unit 41, and an area (second irradiation area) R1B irradiated by the light emitted from the corresponding light-emitting unit 41 and the light emitted from the light-emitting unit 41 adjacent to the corresponding light-emitting unit 41 (or a nearby light-emitting unit 41). Also, one irradiation area may not include the first irradiation area R1A, but may include only the second irradiation area R1B.

[0020] In the above description, the arrangement relationship between each light-emitting section 41 and the illumination region corresponding to the light-emitting section 41 is in a point-symmetric relationship with respect to a single point O, but the present invention is not limited to this. For example, the point serving as the reference for point symmetry may be different for each light-emitting unit 41. That is, each light-emitting unit 41 and the irradiation area irradiated with the light emitted from the light-emitting unit are arranged in a point-symmetrical relationship with respect to a point unique to the light-emitting unit 41. Furthermore, the unique point is located, for example, on an axis connecting the center of the light-entering unit 71 corresponding to the light-emitting unit 41 and the center of the light-exiting unit 72 corresponding to the light-entering unit 71. Therefore, the light-emitting unit 41 and the irradiation area irradiated with the light emitted from the light-emitting unit 41 may be arranged in a point-symmetrical relationship with respect to a point located on an axis connecting the center of the light-entering unit 71 corresponding to the light-emitting unit 41 and the center of the light-exiting unit 72 corresponding to the light-entering unit 71. The axis is the central axis C1 of the unit light converging unit 75. The point corresponding to each of the multiple light-emitting units 41 may be the same point. Also, for example, the point serving as the reference for point symmetry (point O in this embodiment) does not have to be located on the optical axis B2 of the optical lens 30.

[0021] (Light distribution of light emitted from each light-emitting unit) Next, with reference to FIG. 1, a detailed description will be given of the light distribution until the light emitted from the light emitting section 41 illuminates the corresponding illumination area. The light emitted from the light emitting surface 41a of the light emitting unit 41 first enters the unit light converging unit 75 of the light converging unit 70, and the amount of light per unit area is increased by the unit light converging unit 75. That is, the amount of light per unit area (second light amount) φ2 of the light emitted from the light exiting unit 72 of the unit light converging unit 75 is greater than the amount of light per unit area (first light amount) φ1 of the light incident on the light entering unit 71 of the unit light converging unit 75. It is preferable that the light whose amount of light per unit area has been increased by the unit light converging unit 75 is emitted from the light exiting unit 72 of the unit light converging unit 75 at a first full angle at half maximum θ1 and is incident on the corresponding unit first lens 11. The full angle at half maximum of the light incident on the unit first lens 11 is narrowed to a second full angle at half maximum θ2 smaller than the first full angle at half maximum θ1. The light emitted from the unit first lens 11 at the second full angle at half maximum θ2 enters the optical lens 30 from an entrance region 33 provided corresponding to each light-emitting section 41. The light incident on the optical lens 30 exits the optical lens 30 from an exit region 34 provided corresponding to each entrance region 33, and illuminates, for example, an illumination region that is arranged in a position point-symmetric to each light-emitting section 41 with respect to a point O.

[0022] The illustrated point O is a point on the optical axis B2 of the optical lens 30, as described later. Therefore, the light emitted from the central light-emitting part 50 is emitted along the optical axis B2 of the optical lens 30, i.e., in a direction substantially parallel to the optical axis B2, and irradiates the irradiation area R33 located directly above, and the light emitted from the light-emitting parts other than the central light-emitting part 50 irradiates the corresponding irradiation area after intersecting with the optical axis B2 of the optical lens 30. Here, in this specification, "along the optical axis of the optical lens" particularly means "through the optical axis of the optical lens." In this embodiment, the light-emitting units 41 and the corresponding irradiation areas are arranged in point-symmetric positions with respect to a point O located directly above the central light-emitting unit 50, so that the light emitted from the light-emitting units 41 other than the central light-emitting unit 50 intersects with the optical axis B2 of the optical lens 30 to irradiate the corresponding light, but which light-emitting unit 41 intersects with the optical axis B2 of the optical lens 30 depends on the relative positioning of the light-emitting units 41 and the irradiation areas. That is, in this embodiment, the light emitted from the plurality of light emitting portions 41 crosses the optical axis B2 of the optical lens 30 or passes through the optical axis B2 of the optical lens 30 to illuminate the illumination area.

[0023] In the light source 1 disclosed in this embodiment, one of the elements for irradiating the light emitted from each light-emitting section 41 to the corresponding irradiation area is the shape of the entrance area 33 on the first surface 31 and the exit area 34 on the second surface 32 of the optical lens 30. Specifically, the light emitted from each light-emitting section 41 is irradiated to the corresponding irradiation area by refraction of light in the entrance area 33 and refraction of light in the exit area 34. For this purpose, the shape of the entrance area 33 on the first surface 31 and the shape of the exit area 34 on the second surface 32 are set.

[0024] The refraction in the entrance region 33 of the optical lens 30 and the refraction in the exit region 34 are obtained by the difference between the refractive index of the optical lens 30 and the refractive index of the medium in contact with the optical lens 30. Therefore, when setting the shape of the first surface 31 including the entrance region 33 and the shape of the second surface 32 including the exit region 34 of the optical lens 30, the refractive index difference between the refractive index of the optical lens 30 and the refractive index of the medium in contact with the optical lens 30 is also a parameter to be considered. In the light source 1 of this embodiment, the medium in contact with the optical lens 30 is a space, and, for example, air is located in the space. Therefore, in this embodiment, the refractive index difference between the refractive index of the optical lens 30 and the medium in contact with the optical lens 30 is the refractive index difference between the optical lens 30 and the air.

[0025] Moreover, the light incident on the optical lens 30 is incident via the unit first lens 11. Therefore, the light distribution characteristic of the unit first lens 11 is also an element for irradiating the light emitted from the light emitting unit 41 to the corresponding irradiation area. Specifically, it is the emission direction (directivity) of the light emitted from the unit first lens 11, and the emission direction sets the direction of the optical axis of the unit first lens 11.

[0026] In order to irradiate the light emitted from the light-emitting unit 41 onto the corresponding irradiation region in this manner, the shapes of the first surface 31 and the second surface 32 of the optical lens 30 are set. In addition, the refractive index difference between the refractive index of the optical lens 30 and the refractive index of a medium in contact with the optical lens 30 is also a settable parameter. Furthermore, since the light incident on the optical lens 30 is light emitted from the unit first lens 11, the emission direction of the light emitted from the unit first lens 11 can also be a parameter. In this manner, the shape of the entrance area 33 and the shape of the exit area 34 are set, for example, by simulation, taking into consideration the parameters exemplified above. Each of the components will be described in detail below with reference to FIGS. 1, 4A and 5.

[0027] (substrate) The substrate 2 is a wiring substrate having connection electrodes on an upper surface 2a thereof. The connection electrodes are connected to electrodes 44 of the light-emitting portion 41, which will be described later.

[0028] (Frame) As shown in FIG. 1 and FIG. 4A, a frame 3 is disposed on the upper surface 2a of the substrate 2. The frame 3 is hollow and has an opening 4 at the top. The frame 3 preferably has a light absorbing material on the inner surface that does not reflect light. The light absorbing material is formed of, for example, polycarbonate, silicone resin, PPS (Poly Phenilen Sarphayed), PA (Polyamide), or LCP (Liquid Crystal Plastic). The entire frame 3 may be formed of a light absorbing material. A light emitting section 41, a light converging section 70, a first lens 10, and an optical lens 30 are disposed in the hollow of the frame 3. The height from the upper surface 2a of the substrate 2 to the top surface of the frame 3 is, for example, 2.0 mm or more and 10.0 mm or less. By setting the height from the upper surface 2a of the substrate 2 to the top surface of the frame 3 at such a height, the light source device 1 can be mounted on a small electronic device such as a smartphone.

[0029] (Light emitting part) As shown in FIG. 5, the light-emitting section 41 includes a light-emitting element 42, a wavelength conversion member 45 covering the upper surface of the light-emitting element 42, and a light-reflecting member 46 covering the side surfaces of the light-emitting element 42 and the side surfaces of the wavelength conversion member 45. The light emitting element 42 has at least a semiconductor laminate 43 and an electrode 44 having two polarities (for example, a P-side electrode and an N-side electrode). The electrode 44 is electrically connected to a connection electrode of the substrate 2. When the light emitting element 42 is mounted face-down, it is desirable for the light emitting element 42 to mainly emit light from a surface opposite to the surface on which the electrode 44 is provided (hereinafter referred to as the upper surface of the light emitting element 42). The light reflective member 46 is, for example, a white resin containing a light diffusing material such as titanium oxide. By covering the side surfaces of the light emitting element 42 with the light reflective member 46 in this manner, the light emitted from the side surfaces of the light emitting element 42 can be reflected by the light reflective member 46 and emitted from the upper surface of the light emitting element 42. In other words, the light emitted from the light emitting element 42 can be used efficiently. The wavelength conversion member 45 is made of, for example, a silicone resin containing a phosphor or the like. The upper surface of the wavelength conversion member 45 can be used as the light emitting surface 41a of the light emitting unit 41. By covering the upper surface of the light emitting element 42 with the wavelength conversion member 45, it is possible to emit light in a desired wavelength region from the light emitting surface 41a of the light emitting unit 41. The light-emitting units 41 thus configured can be independently controlled to be turned on or off. That is, the light-emitting units 41 can be turned on or off individually.

[0030] (Light converging part) As shown in Fig. 1, the light converging portion 70 includes 25 unit light converging portions 75. The unit light converging portion 75 according to this embodiment is a frustum-shaped lens having rectangular upper and lower surfaces. The area of ​​the upper surface of the frustum-shaped lens is smaller than the area of ​​the lower surface, and the lens tapers from the lower surface to the upper surface. The light entrance portion 71 of the unit light converging portion 75 is the lower surface of the frustum-shaped lens, and the light exit portion 72 of the unit light converging portion 75 is the upper surface of the frustum-shaped lens. The shape of the upper and lower surfaces of the unit light converging portion 75 is not limited to a rectangular shape, but may be a circle, a triangle, a polygon, or the like.

[0031] The unit light converging portions 75, which are frustum-shaped lenses, are arranged so that the light emitting surfaces 41a of the corresponding light emitting portions 41 are covered by the light entrance portions 71. The 25 unit light converging portions 75 in this embodiment are connected to each other on the lower surface side and are one integrated member. Therefore, the light converging portion 70 can be formed as one lens. However, the 25 unit light converging portions 75 may be individual members separated from each other.

[0032] The unit light converging portion 75 is provided to increase the amount of light per unit area by making the area of ​​the light exit portion 72 smaller than the area of ​​the light entrance portion 71 and by totally reflecting the light entering the unit light converging portion 75 at the inner side surface 78 of the unit light converging portion 75. For this reason, the shape of the unit light converging portion 75 (mainly the ratio of the area of ​​the upper surface to the area of ​​the lower surface) and the refractive index difference between the refractive index of the unit light converging portion 75 and the refractive index of the medium in contact with the unit light converging portion 75 are appropriately set. In the light source 1 of this embodiment, the medium in contact with the unit light converging portion 75 is a space, and, for example, air is located in the space. Therefore, the refractive index difference between the refractive index of the unit light converging portion 75 and the medium in contact with the frustum-shaped lens is the refractive index difference between the frustum-shaped lens and air.

[0033] By using the light converging section 70 composed of such unit light converging sections 75, it is possible to increase the amount of light per unit area of ​​the light emitted from the light emitting section 41. Furthermore, by using the light converging section 70, it is possible to use a light emitting section with a larger light emitting surface size compared to when the light converging section 70 is not used. A light emitting section with a larger light emitting surface size is a light emitting section with a larger size. In the field of light sources, which are becoming increasingly miniaturized, being able to use a light emitting section with a larger size is an advantage in manufacturing. This also makes it possible to improve the light extraction efficiency.

[0034] The central axis C1 of the unit light converging portion 75 corresponding to the light emitting portion other than the central light emitting portion 50 may be inclined with respect to the optical axis B2 of the optical lens 30 described later, as shown in FIG. 4A. Here, the central axis C1 of the unit light converging portion 75 is an axis connecting the center of the light entering portion 71 and the center of the light exiting portion 72 of the unit light converging portion 75, and in this embodiment, it is the optical axis of the frustum-shaped lens. In addition, in this specification, the axis (central axis or optical axis) and the axis (central axis or optical axis) being "inclined" means that the two axes intersect with an angle, that is, the two axes are not parallel. The angle at which the central axis C1 of the unit light converging portion 75 is inclined with respect to the optical axis B2 of the optical lens 30 may be appropriately set according to the arrangement relationship between the light emitting portion 41 in which the unit light converging portion 75 is arranged and the irradiation area corresponding to the light emitting portion.

[0035] As described above, in this embodiment, the 25 light-emitting sections 41 and the illumination regions corresponding to the respective light-emitting sections 41 are arranged in a point-symmetric relationship with respect to a point O above the central light-emitting section 50. Therefore, the inclination angle of the central axis C1 of each unit light converging portion 75 with respect to the optical axis B2 of the optical lens 30 (hereinafter also referred to as the inclination angle of the central axis C1 of the unit light converging portion 75) can be set as follows.

[0036] (1) the inclination angle of the central axis C1 of the unit light converging portion 75 arranged in the third row and the second column and the inclination angle of the central axis C1 of the unit light converging portion 75 arranged in the third row and the fourth column are the same inclination angle (first inclination angle); (2) the inclination angle of the central axis C1 of the unit light converging portion 75 arranged in the second row and the third column is the same as the inclination angle of the central axis C1 of the unit light converging portion 75 arranged in the fourth row and the third column; (3) the inclination angle of the central axis C1 of the unit light converging portion 75 arranged in the second row and second column, the inclination angle of the central axis C1 of the unit light converging portion 75 arranged in the second row and fourth column, the inclination angle of the central axis C1 of the unit light converging portion 75 arranged in the fourth row and second column, and the inclination angle of the central axis C1 of the unit light converging portion 75 arranged in the fourth row and fourth column are the same inclination angle (third inclination angle); (4) the inclination angle of the central axis C1 of the unit light converging portion 75 arranged in the third row and the first column is the same as the inclination angle of the central axis C1 of the unit light converging portion 75 arranged in the third row and the fifth column (fourth inclination angle); (5) the inclination angle of the central axis C1 of the unit light converging portion 75 arranged in the first row and the third column is the same as the inclination angle of the central axis C1 of the unit light converging portion 75 arranged in the fifth row and the third column; (6) the inclination angle of the central axis C1 of the unit light converging portion 75 arranged in the second row and the first column, the inclination angle of the central axis C1 of the unit light converging portion 75 arranged in the second row and the fifth column, the inclination angle of the central axis C1 of the unit light converging portion 75 arranged in the fourth row and the first column, and the inclination angle of the central axis C1 of the unit light converging portion 75 arranged in the fourth row and the fifth column are the same inclination angle (sixth inclination angle); (7) the inclination angle of the central axis C1 of the unit light converging portion 75 arranged in the first row and second column, the inclination angle of the central axis C1 of the unit light converging portion 75 arranged in the first row and fourth column, the inclination angle of the central axis C1 of the unit light converging portion 75 arranged in the fifth row and second column, and the inclination angle of the central axis C1 of the unit light converging portion 75 arranged in the fifth row and fourth column are the same inclination angle (seventh inclination angle); (8) the inclination angle of the central axis C1 of the unit light converging portion 75 arranged in the first row and first column, the inclination angle of the central axis C1 of the unit light converging portion 75 arranged in the first row and fifth column, the inclination angle of the central axis C1 of the unit light converging portion 75 arranged in the fifth row and first column, and the inclination angle of the central axis C1 of the unit light converging portion 75 arranged in the fifth row and fifth column are the same inclination angle (eighth inclination angle); (9) The central axis C 1 of the unit light converging portion (central unit light converging portion 80 ) corresponding to the central light emitting portion 50 is disposed on the optical axis B 2 of the optical lens 30 .

[0037] Furthermore, when the shape of the light-emitting portion 41 in a top view is a square and the dimensions of the light-emitting surface 41a of each light-emitting portion 41 are the same, (a) the first tilt angle and the second tilt angle are the same tilt angle; (b) the fourth tilt angle and the fifth tilt angle are the same tilt angle; (c) the sixth tilt angle and the seventh tilt angle are the same tilt angle: (d) the third tilt angle is set to be greater than the first tilt angle and the second tilt angle; (e) the fourth tilt angle and the fifth tilt angle are set to be greater than the first tilt angle and the second tilt angle; (f) the sixth tilt angle and the seventh tilt angle are set to be greater than the fourth tilt angle and the fifth tilt angle; (g) The eighth inclination angle is set to be larger than the sixth inclination angle and the seventh inclination angle.

[0038] When the light emitting sections 41 are arranged in a matrix, a specific method for calculating the angle γ1 (see FIG. 4C) of inclination of the central axis C1 of at least one unit light converging section 75 with respect to the optical axis B2 of the optical lens 30 will be described with reference to FIG. 20. Note that in FIG. 20, the unit light converging section 75 and the unit first lens 11 are omitted for ease of understanding. When the light emitting units 41 are arranged in a matrix, (A) The shortest distance from the optical axis B2 of the optical lens 30 to the center of the light-emitting surface 41a of the light-emitting unit 41 arranged at the corner of the matrix is ​​L; (a) The shortest distance x(0 <x≦L)とし; (c) When the intersection point between the plane on which the light-emitting surfaces 41a of the multiple light-emitting units 41 extend and the optical axis B2 of the optical lens 30 (in the example shown in FIG. 20, the center P of the light-emitting surface 50a of the central light-emitting unit 50) is defined as the center point Q0, the angle formed by a straight line S1 connecting the center point Q0 and one point Q1 of two points located diagonally in the region R1 (a region including all of the two or more irradiation regions) and a straight line S2 connecting the center point Q0 and the other point Q2 of the two points is defined as α (0°<α<180°); The angle γ1 can be calculated, for example, by the following formula 1. The light emitting section 41 located at the corner of the matrix refers to the light emitting section 41 located at the four corners of the matrix. Therefore, in the case of a matrix of 5 rows and 5 columns, for example, the light emitting section 41 located at the corner of the matrix is ​​the light emitting section 41 in the 1st row and 1st column, the light emitting section 41 in the 1st row and 5th column, the light emitting section 41 in the 5th row and 1st column, or the light emitting section 41 in the 5th row and 5th column. Formula 1

[0039] TIFF2025072597000002.tif1277

[0040] In this way, by appropriately tilting the central axis C1 of the unit light converging portion 75 with respect to the optical axis B2 of the optical lens 30 depending on the positional relationship between the light-emitting portion 41 corresponding to the unit light converging portion 75 and the irradiation area corresponding to the light-emitting portion, the light emitted from the light-emitting portion 41 can be more efficiently irradiated to the corresponding irradiation area.

[0041] When the central axis C1 of the unit light converging portion 75 is inclined with respect to the optical axis B2 of the optical lens 30, the inclination angle of the central axis C1 is a factor to be considered when determining the inclination angle of the optical axis B1 of the corresponding unit first lens 11. Therefore, the inclination angle of the central axis C1 of the unit light converging portion 75 with respect to the optical axis B2 of the optical lens 30 is also a parameter to be considered for setting the shape of the entrance region 33 and the shape of the exit region 34 of the optical lens 30 described above.

[0042] In the above, the central axis C1 of the unit light converging portion 75 other than the central unit light converging portion 80 is inclined with respect to the optical axis B2 of the optical lens 30. However, the central axis C1 of the unit light converging portion 75 other than the central unit light converging portion 80 may be parallel to the optical axis B2 of the optical lens 30. In this case, as shown in FIG. 4B, it is preferable that the central axis C2 of all the unit light converging portions 75A including the central unit light converging portion 80 is parallel to the optical axis B2 of the optical lens 30. As a result, the light emitting portion 41 can efficiently extract light by the unit light converging portion 75 having the central axis C1 parallel to the optical axis B2 of the optical lens 30, since the light intensity is high on the upper surface of the light emitting element 42, especially directly above. In addition, such a light converging portion 70A has a simple shape, so that it is easy to form a mold used to form the unit light converging portion 75A.

[0043] (First lens) The first lens 10 is provided to narrow the full angle at half maximum of the light emitted from the light output portion 72 of the unit light converging portion 75 and to provide directivity toward the irradiation area corresponding to the light. The first lens 10 according to the present embodiment is provided for each unit light converging portion 75, and includes 25 unit first lenses 11 provided corresponding to the light output portion 72 of the unit light converging portion 75. As shown in FIG. 1, the unit first lenses 11 are provided separately. However, the unit first lenses 11 may be connected to adjacent unit first lenses and integrated into one member as shown in FIG. 11 described later. The first lens 10 thus configured by integrating the unit first lenses can be said to be a single lens that collectively covers the light output portions 72 of the 25 unit light converging portions 75 and includes the 25 unit first lenses 11 provided for each unit light converging portion 75.

[0044] The unit first lens 11 in this embodiment is a total internal reflection lens (TIR lens). Here, the total internal reflection lens is a lens that can adjust the directionality of light by utilizing total reflection inside the lens. As shown in FIG. 5, the total internal reflection lens used in this embodiment is a lens that has a lower surface 13 with a recess 14 and an upper surface 12 whose cross section is wavy, and is a lens that has a substantially truncated cone shape that tapers from the upper surface 12 to the lower surface 13. The total internal reflection lens used in this embodiment has a rotationally symmetric shape about the optical axis B1.

[0045] The unit first lens 11, which is an internal total reflection lens, is disposed such that the inner surface 14a of the recess 14 is located above the light emitting surface 41a of the light emitting portion 41 and the inner surface 14a covers the light emitting surface 41a. In other words, the unit first lens 11 is disposed such that the opening end 16 of the recess 14 (the connection portion between the inner surface 14a of the recess 14 and the lower surface 13) is located outside the outer periphery of the light emitting surface 41a when viewed from above.

[0046] Next, the extension direction of the optical axis B1 of the unit first lens 11 will be described with reference to FIGS. 1, 2A, and 4A. The unit first lenses 11 arranged corresponding to the unit light converging sections 75 arranged in a matrix of 5 rows and 5 columns are arranged in a matrix of 5 rows and 5 columns as shown in Fig. 2A. The optical axis B1 of the unit first lens 11 may be parallel to the optical axis B2 of the optical lens 30, but it is preferable that the optical axis B1 of at least one unit first lens 11 is inclined with respect to the optical axis B2 of the optical lens 30. In this embodiment, as shown in Fig. 1 and Fig. 4A, the unit first lenses 11 other than the unit first lens (central unit first lens) 20 arranged corresponding to the central unit light converging section 80 are arranged with their optical axes B1 inclined with respect to the optical axis B2 of the optical lens 30 described later. The inclination angle of the optical axis B1 of the other unit first lenses 11 except for the central unit first lens 20 relative to the optical axis B2 of the optical lens 30 can be set to a different value for each unit first lens 11, mainly depending on the inclination angle of the central axis C1 of the corresponding unit light converging portion 75 and the positional relationship between the light-emitting portion 41 corresponding to the unit first lens 11 and the irradiation area corresponding to the light-emitting portion 41.

[0047] As described above, in this embodiment, the 25 light-emitting sections 41 and the illumination regions corresponding to the respective light-emitting sections 41 are arranged in a point-symmetric relationship with respect to a point O above the central light-emitting section 50. Therefore, (1) the optical axis B1 of the unit first lens 11 arranged in the third row and second column and the optical axis B1 of the unit first lens 11 arranged in the third row and fourth column are inclined at the same angle (first angle) with respect to the optical axis B2 of the optical lens 30; (2) the optical axis B1 of the unit first lens 11 arranged in the second row and third column and the optical axis B1 of the unit first lens 11 arranged in the fourth row and third column are inclined at the same angle (second angle) with respect to the optical axis B2 of the optical lens 30; (3) the optical axis B1 of the unit first lens 11 arranged in the second row and second column, the optical axis B1 of the unit first lens 11 arranged in the second row and fourth column, the optical axis B1 of the unit first lens 11 arranged in the fourth row and second column, and the optical axis B1 of the unit first lens 11 arranged in the fourth row and fourth column are inclined at the same angle (third angle) with respect to the optical axis B2 of the optical lens 30; (4) the optical axis B1 of the unit first lens 11 arranged in the third row and first column and the optical axis B1 of the unit first lens 11 arranged in the third row and fifth column are inclined at the same angle (fourth angle) with respect to the optical axis B2 of the optical lens 30; (5) the optical axis B1 of the unit first lens 11 arranged in the first row and third column and the optical axis B1 of the unit first lens 11 arranged in the fifth row and third column are inclined at the same angle (fifth angle) with respect to the optical axis B2 of the optical lens 30; (6) the optical axis B1 of the first unit lens 11 arranged in the second row and first column, the optical axis B1 of the first unit lens 11 arranged in the second row and fifth column, the optical axis B1 of the first unit lens 11 arranged in the fourth row and first column, and the optical axis B1 of the first unit lens 11 arranged in the fourth row and fifth column are each inclined at the same angle (sixth angle) with respect to the optical axis B2 of the optical lens 30; (7) the optical axis B1 of the first unit lens 11 arranged in the first row and second column, the optical axis B1 of the first unit lens 11 arranged in the first row and fourth column, the optical axis B1 of the first unit lens 11 arranged in the fifth row and second column, and the optical axis B1 of the first unit lens 11 arranged in the fifth row and fourth column are each inclined at the same angle (seventh angle) with respect to the optical axis B2 of the optical lens 30; (8) The optical axis B1 of the unit first lens 11 arranged in the first row and first column, the optical axis B1 of the unit first lens 11 arranged in the first row and fifth column, the optical axis B1 of the unit first lens 11 arranged in the fifth row and first column, and the optical axis B1 of the unit first lens 11 arranged in the fifth row and fifth column are each inclined at the same angle (8th angle) with respect to the optical axis B2 of the optical lens 30.

[0048] Furthermore, when the shape of the light-emitting portion 41 in a top view is a square and the dimensions of the light-emitting surface 41a of each light-emitting portion 41 are the same, (a) the first angle and the second angle are the same; (b) the fourth angle and the fifth angle are the same angle; (c) The sixth and seventh angles are the same: (d) the third angle is set to be greater than the first angle and the second angle; (e) the fourth angle and the fifth angle are set to be greater than the first angle and the second angle; (f) the sixth angle and the seventh angle are set to be greater than the fourth angle and the fifth angle; (g) The eighth angle is set to be larger than the sixth angle and the seventh angle. It should be noted that the angle at which the optical axis B1 of the unit first lens 11 is inclined relative to the optical axis B2 of the optical lens 30 is set depending on the inclination angle of the central axis C1 of the corresponding unit light converging portion 75. For example, the angle γ2 (see FIG. 4C) at which the optical axis B1 of the unit first lens 11 is inclined relative to the optical axis B2 of the optical lens 30 may be the same as the angle γ1 at which the central axis C1 of the unit light converging portion 75 is inclined relative to the optical axis B2 of the optical lens 30. When the angles γ1 and γ2 are the same and the angle γ1 is expressed by the above-mentioned formula 1, the angle γ2 can be expressed by the following formula 2 using the shortest distance L, shortest distance x, and angle α used in the above formula 1. Formula 2

[0049] TIFF2025072597000003.tif1277

[0050] (Optical Lenses) As shown in FIG. 4A, the optical lens 30 is disposed above the light-emitting unit 41, and covers the 25 light-emitting units 41, the light converging unit 70, and the first lens 10 collectively. The optical lens 30 according to this embodiment is composed of a plurality of lenses, and in detail, is composed of a first optical lens 36, a second optical lens 37, and a third optical lens 38, which are disposed in order from the first lens 10 side. The first optical lens 36, the second optical lens 37, and the third optical lens 38 are disposed with a space between each lens. For example, air is located in the space. The first optical lens 36, the second optical lens 37, and the third optical lens 38 are supported and fixed by disposing their ends on the support portion 5 provided on the inner side surface of the frame body 3. In addition, in the attached drawings, the support portion supporting the second optical lens 37 and the support portion supporting the third optical lens 38 are omitted. The first optical lens 36, the second optical lens 37, and the third optical lens 38 are arranged so that their optical axes coincide with each other. Therefore, the optical axis B2 of the optical lens 30 is specified as one axis. In this embodiment, the optical lens 30 is arranged so that the optical axis B2 is perpendicular to the upper surface 2a of the substrate 2 and passes through the midpoint P of the central light-emitting portion 50. Therefore, a point O that defines the point-symmetric arrangement relationship between the light-emitting portion 41 and the corresponding irradiation area is located on the optical axis B2 of the optical lens 30. The method of supporting the first optical lens 36, the second optical lens 37, and the third optical lens 38 is not limited to the method using the support portion 5 provided on the inner side surface of the frame body 3. For example, the first optical lens 36, the second optical lens 37, and the third optical lens 38 may be attached to and supported by a support rod provided on the inner upper surface of the frame body 3.

[0051] The optical lens 30 includes a first surface 31 located on the side of the light-emitting surface 41a of the light-emitting section 41, and a second surface 32 located on the opposite side to the first surface 31, i.e., on the side of the opening 4 of the frame 3. When the optical lens 30 includes a first optical lens 36, a second optical lens 37, and a third optical lens 38 as in this embodiment, the surface of the first optical lens 36 on the side of the light-emitting section 41 is the first surface 31, and the surface of the third optical lens 38 on the side of the opening 4 of the frame 3 is the second surface 32.

[0052] The first surface 31 includes a plurality of entrance regions 33 corresponding to the respective light-emitting portions 41 and into which light emitted from the respective light-emitting portions 41 is incident. The second surface 32 includes a plurality of exit regions 34 corresponding to the respective entrance regions 33. As described above, the light distribution characteristics of the light emitted from each light-emitting unit 41 are determined by setting the shapes of the first surface 31 including the entrance region 33 and the second surface 32 including the exit region 34 of the optical lens 30. In this embodiment, the optical lens 30 is composed of three lenses, the first optical lens 36, the second optical lens 37, and the third optical lens 38, which are arranged to be separated from each other by air. Therefore, the light distribution characteristics of the light between the entrance region 33 and the exit region 34 may be affected by the shape of the region (exit region) from which the light exits the first optical lens 36, the difference between the refractive index of the first optical lens 36 and the refractive index of air, the shape of the region (entrance region) from which the light enters the second optical lens 37, the shape of the region (exit region) from which the light exits the second optical lens 37, the difference between the refractive index of the second optical lens 37 and the refractive index of air, the shape of the region (entrance region) from which the light enters the third optical lens 38, and the difference between the refractive index of the first optical lens 36 and the refractive index of air. Therefore, the shape of the entrance area 33 and the shape of the exit area 34 are designed taking these factors into consideration.

[0053] The respective entrance regions 33 where the light emitted from the adjacent light emitting units 41 enter the optical lens 30 may overlap in part or in whole depending on the magnitude of the full angle at half maximum θ2 of the light emitted from the corresponding unit first lens 11, the distance from the unit first lens 11 to the optical lens 30, the inclination angle of the optical axis B1 of the unit first lens 11 with respect to the optical axis B2 of the optical lens 30, and the like. Therefore, two adjacent entrance regions 33 of the multiple entrance regions 33 of the optical lens 30 may overlap in part or in whole. In this specification, the region of each entrance region 33 where only the light emitted from the corresponding unit first lens 11 enters is called the first entrance region 33c, and the region of each entrance region 33 that overlaps with the adjacent entrance region 33 is called the second entrance region 33d. The first entrance region 33c and the second entrance region 33d are shown in FIG. 4C. Therefore, each entrance region 33 of the optical lens 30 may include a first entrance region 33c into which light emitted from a light-emitting section 41 corresponding to the entrance region 33 is incident, and a second entrance region 33d into which, in addition to the light, light emitted from a light-emitting section 41 adjacent to the entrance region 33 is incident. Therefore, each entrance region 33 is not necessarily designed independently, but may be appropriately designed in relation to the adjacent entrance regions.

[0054] Similarly, the respective exit regions 34 from which the light incident on the optical lens 30 from each of the adjacent entrance regions 33 exit the optical lens 30 may overlap in part or in whole depending on the position of the corresponding entrance region 33, the refractive index difference between the refractive index of the optical lens 30 and the refractive index of the medium in contact with the optical lens 30, the arrangement of the corresponding irradiation region, and the like. Therefore, two adjacent exit regions 34 of the multiple exit regions 34 of the optical lens 30 may overlap in part or in whole. In this specification, the region of each exit region 34 from which only the light emitted from the corresponding unit first lens 11 exits is called the first exit region 34c, and the region of each exit region 34 that overlaps with the adjacent exit region 34 is called the second exit region 34d. The first exit region 34c and the second exit region 34d are shown in FIG. 4A. Therefore, each exit region 34 of the optical lens 30 may include a first exit region 34c from which light that has entered the optical lens 30 via the entrance region 33 corresponding to the exit region 34 exits, and a second exit region 34d from which light that has entered the optical lens 30 from an entrance region 33 adjacent to the entrance region 33 exits in addition to the first exit region 34c. Therefore, each exit region 34 is not necessarily designed independently, but may be appropriately designed in relation to the adjacent exit region 34.

[0055] 4C, the shortest distance d0 between the first surface 31 of the optical lens 30 and the first lens 10 is, for example, 0.1 mm or more and 1.0 mm or less, and preferably, for example, 0.1 mm or more and 0.5 mm or less. The shortest distance d0 in this embodiment refers to the shortest distance between the first surface 31 of the optical lens 30 and the first lens 10, regardless of the shape of the first surface 31 and the shape of the first lens 10. By setting the shortest distance d0 between the first surface 31 of the optical lens 30 and the first lens 10 at such a height, the light source device 1 can be mounted on a small electronic device such as a smartphone.

[0056] Next, the distribution of light emitted from each light-emitting portion 41 will be described in detail with reference to FIGS. 6A to 7B.

[0057] (Light distribution from central light emitting part 50) As shown in FIGS. 6A and 6B, the light emitted from the light emitting surface 50a of the central light emitting portion 50 is mainly (1) Light having a first light amount (amount of light per unit area) φ1 enters the central unit light converging portion 80 from the light entering portion 81 of the central unit light converging portion 80 (see FIG. 6A ); (2) The light is totally reflected at the inner side surface 83 of the central unit light converging portion 80, increasing the amount of light per unit area. (3) from the light exit portion 82 of the central unit light converging portion 80, light having a second light amount (light amount per unit area) φ2 is emitted outside the central unit light converging portion 80 at a first full angle at half maximum θ1; (4) The light is incident on the central first lens 20 from the inner surface 23a of the recess 23 of the central unit first lens 20, (5) The light is totally reflected by the inner side surface 24 of the central unit first lens 20, narrowing the full angle at half maximum. (6) exiting from the upper surface 21 of the central unit first lens 20 at a second full angle at half maximum θ2; (7) The light is incident on the optical lens 30 from the incident area 33a corresponding to the central light-emitting portion 50 (see FIG. 6B ). (8) The light is emitted from the exit area 34a corresponding to the entrance area 33a to the outside of the optical lens 30. (9) Irradiation area R33 corresponding to the central light-emitting portion 50 (irradiation area located directly above the central light-emitting portion 50) is irradiated.

[0058] Since the central light-emitting section 50 irradiates the irradiation region R33 arranged directly above it, the central axis C1 of the central unit light converging section 80 is arranged so as to be perpendicular to the light-emitting surface 50a of the central light-emitting section 50, and the central unit first lens 20 is arranged so that the optical axis B1 is perpendicular to the light exit section 82 of the central unit light converging section 80. In other words, the central axis C1 of the central unit light converging section 80 and the optical axis B1 of the central unit first lens 20 are arranged on the optical axis B2 of the optical lens 30. The shape of the entrance region 33a (entrance region of the first optical lens 36) of the optical lens 30 corresponding to the central light-emitting portion 50, and the shape of the exit region 34a (exit region of the third optical lens 38) of the optical lens 30 corresponding to the entrance region 33a are appropriately designed so that the light emitted from the central unit first lens 20 irradiates the irradiation region R33 located directly above the central light-emitting portion 50. Similarly, the shape of the exit area of ​​the first optical lens 36 corresponding to the central light-emitting section 50, the shape of the entrance area and the shape of the exit area of ​​the second optical lens 37, and the shape of the entrance area of ​​the third optical lens 38 are appropriately designed so that the light emitted from the central unit first lens 20 irradiates the irradiation area R33 located directly above the central light-emitting section 50.

[0059] (Light distribution from light emitting parts other than the central light emitting part 50) The distribution of light from light-emitting parts other than the central light-emitting part 50 differs depending on the position of the light-emitting part, but is the same in that the light emitted from the light-emitting part intersects with the optical axis B2 of the optical lens 30 and illuminates the corresponding irradiation area. Therefore, the light distribution of light emitted from light-emitting sections other than the central light-emitting section 50 will be described using the light-emitting section (peripheral light-emitting section) 55 (see FIG. 2A) arranged in the first row and third column as an example. As shown in FIG. 7A, the light emitted from the light emitting surface 55a of the surrounding light emitting unit 55 is mainly (1) Light having a first light amount (amount of light per unit area) φ1 enters the surrounding unit light converging portion 85 from the light entering portion 86 of the surrounding unit light converging portion 85 (see FIG. 7A ); (2) The light is totally reflected at the inner side surface 88 of the peripheral unit light converging portion 85, increasing the amount of light per unit area. (3) from the light exit portion 87 of the peripheral unit light converging portion 85, light having a second light amount (light amount per unit area) φ2 is emitted to the outside of the peripheral unit light converging portion 85 at a first full angle at half maximum θ1; (4) The light is incident on the peripheral unit first lens 25 from the inner surface 28a of the recess 28 of the unit first lens (peripheral unit first lens) 25 arranged to cover the light exit portion 87 of the peripheral unit light converging portion 85, (5) The light is totally reflected by the inner side surface 29 of the first peripheral unit lens 25, narrowing the full angle at half maximum. (6) The light is emitted from the upper surface 26 of the peripheral unit first lens 25 at a second full angle at half maximum θ2. (7) The light is incident on the optical lens 30 from the incident region 33b corresponding to the peripheral light-emitting portion 55 (see FIG. 7B ). (8) intersects with the optical axis B2 of the optical lens 30 within the optical lens 30; (9) The light is emitted from the exit area 34b corresponding to the entrance area 33b to the outside of the optical lens 30. (10) Illumination area R35 corresponding to the surrounding light-emitting portion 55 is illuminated. In addition, the position where the light emitted from the surrounding light-emitting portion 55 intersects with the optical axis B2 of the optical lens 30 is not limited to within the optical lens 30, but may be any position from the time the light is emitted from the surrounding light-emitting portion 55 to the time the light is irradiated to the corresponding irradiation area R35.

[0060] As described above, in this embodiment, the 25 light-emitting units 41 and the irradiation regions corresponding to each light-emitting unit 41 have a point-symmetric arrangement relationship with respect to a point O above the central light-emitting unit 50. Therefore, the surrounding unit light converging unit 85 is arranged so that its central axis C1 intersects with the optical axis B2 of the optical lens 30 above the central light-emitting unit 50. In addition, the surrounding unit first lens 25 is arranged so that its optical axis B1 intersects with the optical axis B2 of the optical lens 30 above the central light-emitting unit 50. As a result, the light emitted from the light-emitting unit 41 has higher directivity toward the corresponding irradiation region R35 compared to a case in which the surrounding unit light converging unit 85 and the surrounding unit lens 25 are not provided. In addition, the central axis C1 of the surrounding unit light converging portion 85 and the optical axis B1 of the surrounding unit first lens 25 may be parallel to each other.

[0061] The shape of the entrance region 33b (entrance region of the first optical lens 36) of the optical lens 30 corresponding to the surrounding light-emitting portion 55 and the shape of the exit region 34b (exit region of the third optical lens 38) of the optical lens 30 are appropriately designed so that the light emitted from the surrounding unit first lens 25 irradiates an irradiation region R35 arranged in a position point-symmetrical to the surrounding light-emitting portion 55 with respect to a point O. Similarly, the shape of the exit area of ​​the first optical lens 36, the shape of the entrance area and the shape of the exit area of ​​the second optical lens 37, and the shape of the entrance area of ​​the third optical lens 38 are appropriately designed so that the light emitted from the surrounding unit first lenses irradiates an illumination area arranged in a position point-symmetrical to the surrounding light-emitting portion with respect to point O.

[0062] As described above, the light source 1 according to this embodiment includes the light converging section 70 arranged to cover the light emitting surface 41a of the light emitting section 41, and the first lens 10 arranged to cover the light exit section 72 of the light converging section 70, and the light emitted from the light emitting surface 41a of the light emitting section 41 has its quantity of light per unit area increased by the light converging section 70, its full angle at half maximum narrowed by the first lens 10, and has high directivity toward the corresponding irradiation area before entering the optical lens 30. This makes it possible to irradiate the corresponding desired irradiation area with sufficient light quantity and brightness using the light emitted from the light emitting surface 41a of the light emitting section 41.

[0063] 2. Embodiment 2 A light source 201 according to the second embodiment shown in FIG. 8 differs from the light source 1 according to the first embodiment in that an outer side surface 79 of a unit light converging portion 75 is covered with a second light reflective member 295. The second light reflective member 295 is, for example, a white coating member made of a white resin containing a light diffusing material such as titanium oxide. In this way, by covering the outer side surface 79 of the unit light converging portion 75 with the second light reflective member 295, the light entering the unit light converging portion 75 is more likely to be totally reflected by the inner side surface 78 of the unit light converging portion 75, and the light converging portion 270 can more efficiently increase the amount of light per unit area.

[0064] 3. Embodiment 3 The light source 301 according to the third embodiment shown in FIG. 9 differs from the light source 1 according to the first embodiment in that the light converging portion 370 is composed of a third light reflective member 395 having a first opening on the light emitting portion side and a second opening on the optical lens side, and including a plurality of hollow portions 375 provided corresponding to each of the plurality of light emitting portions. In this embodiment, light entering from first opening 376 of cavity 375 at a first light amount (light amount per unit area) φ1 is totally reflected within cavity 375 and emitted from second opening 377 to the outside of cavity 375 at a second light amount (light amount per unit area) φ2 larger than the first light amount φ1. Therefore, in this embodiment, cavity 375 is a unit light converging portion, first opening 376 is a light entering portion, and second opening 377 is a light exiting portion.

[0065] The light converging portion 370 will now be described in detail. The light converging portion 370 has an upper surface 370a located on the optical lens 30 side and a lower surface 370b located on the light emitting portion 41 side, and has an external shape of a substantially rectangular parallelepiped. The light converging portion 370 is disposed over the 25 light emitting portions 41. The light converging portion 370 is formed by providing a plurality of hollow portions 375 in a third light reflective member 395 formed of a white resin containing a light diffusing material such as titanium oxide.

[0066] The cavity 375 is a through hole having a second opening 377 on an upper surface 370a of the light converging portion 370 and a first opening 376 on a lower surface 370b of the light converging portion 370. The cavity 375 is provided corresponding to each light emitting portion 41. Thus, the light converging portion 370 has 25 cavities 375. The area of ​​the first opening 376 of the cavity 375 is larger than the area of ​​the second opening 377, and the cavity 375 tapers from the first opening 376 to the second opening 377. The shape of the first opening 376 and the shape of the second opening 377 are, for example, a circle, a rectangle, or another polygon.

[0067] Here, the opening is an opening of cavity 375 formed on a surface (upper surface 370a or lower surface 370b). The area of ​​the opening is the area of ​​the region surrounded by the contour line of the opening. The shape of the opening is the shape of the region surrounded by the contour line of the opening.

[0068] The shape and dimensions of the first opening 376 are determined so that the contour line of the first opening 376 is located outside the outer periphery of the light emitting surface 41a of the light emitting unit 41 when the light source 301 is seen through from above. This allows the light emitted from the light emitting surface 41a of the light emitting unit 41 to efficiently enter the cavity 375.

[0069] In this embodiment, the cavity 375 is a space filled with air, but may be filled with another material, such as polycarbonate or silicone resin, preferably a material with a refractive index close to that of air.

[0070] The central axis C3 of the hollow portion 375 connecting the midpoint of the first opening 376 and the midpoint of the second opening 377 may be inclined with respect to the optical axis B2 of the optical lens 30, depending on the positional relationship between the light-emitting portion 41 corresponding to the hollow portion 375 and the irradiation area corresponding to the light-emitting portion 41. In this case, the inclination angle of the central axis C3 with respect to the optical axis B2 of the optical lens 30 is a parameter that should be considered for setting the shape of the entrance area 33 and the shape of the exit area 34 of the optical lens 30.

[0071] In this manner, by constructing the light converging portion 370 from a third light reflective member 395 having a plurality of cavities 375 having a first opening 376 on the light emitting portion 41 side and a second opening 377 on the optical lens 30 side, light absorption in the unit light converging portion (cavity 375) is reduced compared to the unit light converging portion 75 which is a lens as described above, and therefore light loss can be suppressed.

[0072] Variations 1. Variation 1 The light source 401 according to the first modification shown in FIG. 10 is different from the light source according to the embodiment in that the unit first lens is a frustum-shaped lens in which the area of ​​the upper surface 411a is larger than the area of ​​the lower surface 411b. The shape of the upper surface 411a and the lower surface 411b of the unit first lens 411 according to the first modification may be, for example, a circle, a triangle, a rectangle, or the like. The unit first lens 411 is arranged to cover the light output portion 72 of the unit light converging portion 75 with the lower surface 411b. The unit first lens 411 is not limited to a frustum-shaped lens in which the area of ​​the upper surface 411a is larger than the area of ​​the lower surface 411b, but may be a frustum-shaped lens in which the area of ​​the upper surface 411a is smaller than the area of ​​the lower surface 411b, or may be a columnar lens in which the area of ​​the upper surface 411a is equal to the area of ​​the lower surface 411b. The unit first lens 411 can also adjust the directivity of light by utilizing the reflection inside the unit first lens 411, like the above-mentioned internal total reflection lens. In addition, since the unit first lenses 411 have a simple shape, a mold for forming the unit first lenses 411 can be easily formed.

[0073] 2. Variation 2 This variant and variants 3 to 5 described below differ from the light source of the embodiment in that the first lens is a lens that collectively covers the light exit portions 72 of multiple unit light converging portions 75 and has at least one convex surface (convex surface) facing the optical lens 30.

[0074] In a light source 501 according to Modification 2 shown in FIG. 11, the unit first lens is a lens having one convex surface (convex surface) on the optical lens 30 side. The unit first lens 511 according to Modification 2 has, for example, a semicircular cross-sectional shape, and the convex surface 511a is formed as a smoothly curved surface. Furthermore, the unit first lenses 511 are connected to each other on the lower surface side and integrated. Therefore, the first lens 510 collectively covers the light exit portions 72 of the multiple unit light converging portions 75, and includes multiple unit first lenses 511 provided corresponding to the light exit portions 72, each having a convex surface (convex surface) 511a on the optical lens 30 side.

[0075] Since the unit first lenses 511 included in such a first lens 510 have a simple shape, it is easy to form a mold used to form the first lens 510. In addition, in such a light source 501, since a plurality of unit first lenses 511 are integrated to form one first lens 510, it is not necessary to arrange each unit first lens individually. That is, for example, by arranging the first lens 510 so that the optical axis B5 of the central unit first lens located at the center of the first lens 510 coincides with the optical axis B2 of the optical lens 30 or the central axis C1 of the central unit light converging section 80, all the unit first lenses 511 can be arranged on the light converging section 70. This can simplify the manufacturing process.

[0076] However, the unit first lens 511 having the above-described semicircular cross-sectional shape and the convex surface 511a which is a smoothly curved surface on the optical lens 30 side is not limited to being one integrated lens, but may be separate components.

[0077] 3. Variation 3 The first lens 610 of the light source 601 according to the third modification has one convex surface on the optical lens 30 side. 12, first lens 610 has convex surface 610a, the contour shape of convex surface 610a in cross section is arc-shaped, and convex surface 610a is formed by a smooth curved surface. Since such a first lens 610 has a simple shape, it is easy to form a mold used to form the first lens 610. When arranging such a first lens 610 on a plurality of unit light converging portions 75, for example, the optical axis B6 of the first lens 610 may be arranged on the optical axis B2 of the optical lens 30 or the central axis C1 of the central unit light converging portion 80. This can simplify the manufacturing process.

[0078] Furthermore, the curvature of convex surface 610a of first lens 610 may be the same from optical axis B6 to the end of first lens 610, or may vary depending on the distance from optical axis B6. In particular, by increasing the curvature of convex surface 610a of first lens 610 from optical axis B6 to the end of first lens 610, the following effects are expected. First, among the light emitted from the light-emitting units 41 arranged near the end of the convex surface 610a of the first lens 610 (for example, in this embodiment, the light-emitting units 41 arranged in the first row, the kth column, the fifth row, the kth column, the kth row, the first column, and the kth row, the fifth column (k=1 to 5)), light that deviates from the direction in which directivity is desired (in this embodiment, the direction of the irradiation area corresponding to the light-emitting units 41), particularly light that proceeds toward the frame body 3, is unlikely to be incident on the optical lens 30. Therefore, the light loss of the light-emitting units 41 is large. Therefore, by making the curvature of the end of the convex surface 610a of the first lens 610 larger than the curvature of the central part of the convex surface 610a, it is possible to refract the light that proceeds toward the frame body 3, which is the light emitted from the light-emitting units 41 arranged near the end of the convex surface 410a, in the direction in which directivity is desired, and the light loss of the light-emitting units 41 can be suppressed.

[0079] 4. Variation 4 The first lens 710 of the light source 701 according to the fourth modification has one convex surface on the optical lens 30 side. 13, the first lens 710 has a (convex surface) 710a. The first lens 710 includes a flat surface 710b located in the center of the convex surface 710a, and a curved surface 710c that connects the flat surface 710b and a bottom surface 710d of the first lens 710 and is located at an end of the first lens 710. The flat surface 710b is perpendicular to the optical axis B2 of the optical lens 30. The curved surface 710c is curved toward the outside of the first lens 710. The first lens 710 is disposed so as to collectively cover the light exit portions 72 of all the unit light converging portions 75 with the lower surface 710d. As described for the light source 601 of the modified example 3, in the light source 701 of this modified example, the curvature of the curved surface 710c of the first lens 710 on the end side of the first lens 710 is increased, so that the light emitted from the light emitting unit 41 arranged near the end of the first lens 710 can be refracted in a direction in which the direction of the light emitting unit 41 is desired to have directivity (in this modified example, the direction of the irradiation area corresponding to the light emitting unit 41). Therefore, the loss of light from the light emitting unit 41 can be suppressed. Furthermore, by making the central part of the convex surface 710a of the first lens 710 flat, the lens thickness can be made thinner than the first lens having one convex curved surface on the entire optical lens 30 side as in the light source 601 of the modified example 3, so that the light source can be made smaller.

[0080] Since such a first lens 710 has a simple shape, it is easy to form a mold used to form the first lens 710. When arranging such a first lens 710 on a plurality of unit light converging portions 75, for example, the optical axis B7 of the first lens 710 may be arranged on the optical axis B2 of the optical lens 30 or the central axis C1 of the central unit light converging portion 80. This can simplify the manufacturing process.

[0081] 5. Variation 5 The first lens 810 of the light source 801 according to the fifth modification has one convex surface on the optical lens 30 side. (Convex surface) 810a. 14, the cross-sectional shape of the convex surface 810a is a smoothly curved surface arranged in an annular shape centered on the optical axis B8 of the first lens 810. Therefore, in a cross-sectional shape passing through the optical axis B8 of the first lens 810, the convex surface 810a has two apexes 810d. It is desirable that the apex 810d of the convex surface 810a is arranged at a position where a distance d1 from the apex 810d of the convex surface 810a to the optical axis B8 of the first lens 810 is shorter than a distance d2 from the apex 810d of the convex surface 810a to the outer peripheral edge 810f of the first lens 810. The center of first lens 810 is formed into a concave surface 810c that is continuous with convex surface 810a, and an apex 810e of concave surface 810c is disposed on optical axis B8 of first lens 810. Note that optical axis B8 of first lens 810 is disposed to coincide with optical axis B2 of optical lens 30. It is preferable that the end of first lens 810 (in this embodiment, the end of convex surface 810a, in the vicinity of outer circumferential edge 810f) has a curvature larger than the curvature of concave surface 810c. Moreover, the first lens 810 is disposed so as to collectively cover the light exit portions 72 of all unit light converging portions 75 with the lower surface 810b, and when disposing the first lens 810 on a plurality of unit light converging portions 75, for example, the optical axis B8 of the first lens 810 may be disposed on the optical axis B2 of the optical lens 30 or the central axis C1 of the central unit light converging portion 80. This can simplify the manufacturing process.

[0082] 6. Variation 6 The light source according to the sixth modification is different from the light source according to the embodiment in that the unit first lenses other than the central unit first lens are internal total reflection lenses of a rotationally asymmetric shape about the optical axis as shown in Fig. 15. The unit first lenses 911 other than the central unit first lens according to the sixth modification are internal total reflection lenses of a rotationally asymmetric shape about the optical axis B9 formed such that a connection portion 916 (open end of the recess 914) between the lower surface 913 and an inner surface 914a of a recess 914 provided on the lower surface 913 is in contact with the light output portion 72. That is, the light output portion 72 of the unit light converging portion 75 is covered by the inner surface 914a of the recess 914 provided on the light output portion 72 side of the unit light converging portion 75 of the unit first lens 911 which is an internal total reflection lens. By using such a unit first lens 911, the light emitted from the light exit portion 72 enters the unit first lens 911 via the inner surface 914a of the recess 914 of the unit first lens 911 without leaking out from between the unit light converging portion 75 and the unit first lens 911. This makes it possible to improve the utilization efficiency of the light emitted from the light emitting portion 41.

[0083] The inclination angle of the unit first lens 911 with respect to the optical axis B2 of the optical lens 30 differs depending on which row and column the light-emitting section is arranged in in the 5-row by 5-column matrix, and therefore the shape of the unit first lens 911 differs depending on each light-emitting section 41. However, in this embodiment, the 25 light-emitting sections 41 and the illumination regions corresponding to the respective light-emitting sections 41 have a positional relationship that is point-symmetric with respect to a point O above the central light-emitting section 50. Therefore, (1) The first unit lens 911 arranged in the third row and second column and the first unit lens 911 arranged in the third row and fourth column have the same shape (shape 1); (2) the unit first lens 911 arranged in the second row and third column and the unit first lens 911 arranged in the fourth row and third column have the same shape (shape 2); (3-1) the unit first lens 911 arranged in the second row and second column and the unit first lens 911 arranged in the fourth row and fourth column have the same shape (shape 3-1); (3-2) the unit first lens 911 arranged in the second row and fourth column and the unit first lens 911 arranged in the fourth row and second column have the same shape (shape 3-2); (4) the optical axis of the first unit lens 911 arranged in the third row and the first column and the optical axis of the first unit lens 911 arranged in the third row and the fifth column have the same shape (shape 4); (5) the optical axis of the unit first lens 911 arranged in the first row and the third column and the optical axis of the unit first lens 911 arranged in the fifth row and the third column have the same shape (shape 5); (6-1) The unit first lens 911 arranged in the second row and first column and the unit first lens 911 arranged in the fourth row and fifth column have the same shape (shape 6-1); (6-2) The unit first lens 911 arranged in the second row and fifth column and the unit first lens 911 arranged in the fourth row and first column have the same shape (shape 6-2); (7-1) The unit first lens 911 arranged in the first row and second column and the unit first lens 911 arranged in the fifth row and fourth column have the same shape (shape 7-1); (7-2) The unit first lens 911 arranged in the first row and fourth column and the unit first lens 911 arranged in the fifth row and second column have the same shape (shape 7-2); (8-1) The unit first lens 911 arranged in the first row and first column and the unit first lens 911 arranged in the fifth row and fifth column have the same shape (shape 8-1); (8-2) The unit first lens 911 arranged in the first row and fifth column and the unit first lens 911 arranged in the fifth row and first column have the same shape (shape 8-2).

[0084] Furthermore, when the top view shape of the light-emitting section 41 is a square and the dimensions of the light-emitting surface 41a of each light-emitting section 41 are the same, shape 1 and shape 2 are the same shape, shape 4 and shape 5 are the same shape, shape 6-1 and shape 6-2, shape 7-1 and shape 7-2 are the same shape, shape 3-1 and shape 3-2 are the same shape, and shape 8-1 and shape 8-2 are the same shape.

[0085] 7. Variation 7 16 differs from the light source according to the embodiment in that the wavelength conversion member provided in the light-emitting section is disposed so as to cover the upper surfaces of the light-emitting elements 42 and the upper surfaces of the light-reflective members 46. The wavelength conversion member 1045 in the seventh modification may be provided for each light-emitting section 41, or may be a single member that collectively covers the upper surfaces of the light-emitting elements 42 and the upper surfaces of the light-reflective members 46 of all 25 light-emitting sections 41. Furthermore, since the wavelength conversion member 1045 is a thin member, when the wavelength conversion member 1045 is arranged in this manner to cover the upper surface of the light-emitting element 42 and the upper surface of the light-reflective member 46, the light-emitting surface 1041a of the light-emitting section 1041 can be regarded as the area of ​​the wavelength conversion member 1045 that is located directly above the upper surface of the light-emitting element 42.

[0086] Other variations In the light sources according to the above-mentioned embodiments and modifications, the optical lens 30 is composed of three lenses, namely, the first optical lens 36, the second optical lens 37, and the third optical lens 38, but the number of lenses constituting the optical lens is not limited to this. For example, as shown in FIG. 17, the optical lens 1130 may be composed of one lens. For example, as shown in FIG. 18, the optical lens 1230 may be composed of two lenses, namely, the first optical lens 1236 and the second optical lens 1237. Also, for example, the optical lens may be composed of four or more lenses.

[0087] In the light sources according to the above-described embodiment and modified examples, the optical lens is supported by the support 5 provided on the inner surface of the frame 3, but the means for supporting the optical lens is not limited to this. For example, as shown in Fig. 19, the first optical lens 36, the second optical lens 37, and the third optical lens 38 may be supported by a first leg 6A, a second leg 6B, and a third leg 6C connected to the ends of the first optical lens 36, the second optical lens 37, and the third optical lens 38, respectively.

[0088] The first leg 6A extends from an end of the first optical lens 36 to the upper surface 2a of the substrate 2 to support the first optical lens 36. The second leg 6B extends from an end of the second optical lens 37 to the upper surface of the first leg 6A to support the second optical lens 37. The third leg 6C extends from an end of the third optical lens 38 to the upper surface of the second leg 6B to support the third optical lens 38.

[0089] The first leg 6A, the second leg 6B, and the third leg 6C may be formed of, for example, a light-reflective material or a light-shielding material. The first leg 6A, the second leg 6B, and the third leg 6C may be a part of a lens formed of, for example, the same material as the first optical lens 36, the second optical lens 37, and the third optical lens 38. In this case, the joining member 7 that joins the first leg 6A, the second leg 6B, and the third leg 6C together may be, for example, an adhesive or the like. Furthermore, the first leg 6A, the second leg 6B, and the third leg 6C may be integrated into one single member. When each optical lens is supported by legs connected to the end of the optical lens in this manner, the light source does not need to include a frame.

[0090] The above describes the embodiments, modifications, and examples of the present disclosure. However, the disclosed contents may vary in details of the configuration, and the combination and order of elements in the embodiments, modifications, and examples may be made without departing from the scope and concept of the present disclosure as claimed.

[0091] Since the light source device of the present invention can irradiate a desired irradiation area with light, it can be suitably used for illumination, camera flashes, vehicle headlights, etc. However, the light source device of the present invention is not limited to these applications. [Explanation of symbols]

[0092] 1, 201, 301, 401, 501, 601, 701, 801, 1001 light source 2. Board 2a Top side 3 Frame 4 Openings 5 Support part 6A, 6B, 6C legs 7 Joining materials 10, 510, 610, 710, 810 First lens 610a, 710a, 810a convex 810d, 810e top 810c concave 810f outer edge 11, 211, 311, 411, 511, 911 Unit 1st Lens 12 Top side 13, 913 bottom surface 14, 914 Recess 14a, 914a Inner surface of recess 15 Medial side 16,916 Connection 511a Convex 20. Central unit first lens 21 Top side 22 Bottom side 23 Recess 23a Inside 24 Medial side 25 Peripheral Unit First Lens 26 Top side 28 Recess 28a Inside 29 Medial side 30, 1130, 1230 Optical Lenses 31 Page 1 33 Incidence area 33a (center) incident area 33b (surrounding) incident area 33c 1st incidence area 33d 2nd incidence area 32 Side 2 34 Output area 34a Output area 34b Output area 34c 1st output area 34d 2nd output area 36, 1236 First Optical Lens 37, 1237 Second optical lens 38 Third Optical Lens 41, 1041 Light emitting part 41a, 41a2, 41b1, 41b2, 50A1, 50B1, 1041a Light emitting surface 42 Light emitting element 43 Semiconductor laminate 44 electrode 45, 1045 Wavelength conversion material 46 Light-reflective materials 50, 50A, 50B central light emitting part 55 Surrounding light emitting part 60 Light emitting part 70 Light Convergence Section 71, 81, 86 Light receiving part 72, 82, 87 Idemitsu Department 75, 75A Unit light converging section 78 Medial side 79 Outer side 80 Central unit light converging section 83 Medial side 85 Unit light converging section 88 Medial side 375 Cavity 376 First Opening 377 Second Opening B1, B2, B5~B9 Optical axis C1, C2, C3 center axis O one point P midpoint R1 area R33, R35, R42 irradiation area

Claims

1. A light source device for irradiating light onto two or more illumination regions, A plurality of light emitting units each having a light emitting surface on an upper surface thereof; an optical lens disposed above the light emitting surface of the light emitting unit, the optical lens comprising: a first surface located on the light emitting surface side of the light emitting unit, the first surface including a plurality of incident regions corresponding to the plurality of light emitting units, into which light emitted from the light emitting units is incident; and a second surface located on the opposite side to the first surface, the second surface including a plurality of exit regions corresponding to the plurality of incident regions; a light source device comprising: a plurality of light entrance sections provided corresponding to each of the plurality of light-emitting sections and covering the light-emitting surface of the light-emitting section; and a plurality of light exit sections provided corresponding to each of the plurality of light entrance sections and having an area smaller than an area of ​​the light entrance sections, and a light converging section positioned between the light-emitting section and the optical lens.

2. A light source device for irradiating light onto two or more illumination regions, A plurality of light emitting units each having a light emitting surface on an upper surface thereof; an optical lens located above a light emitting surface of the light emitting unit, the optical lens having a first surface including a first entrance area and a second surface including a first exit area; a light source device comprising: a plurality of light entrance sections provided corresponding to each of the plurality of light-emitting sections and covering the light-emitting surface of the light-emitting section; and a plurality of light exit sections provided corresponding to each of the plurality of light entrance sections and having an area smaller than an area of ​​the light entrance sections, and a light converging section positioned between the light-emitting section and the optical lens.

3. 3. The light source device according to claim 1, wherein an axis connecting the center of the light-entering portion provided corresponding to at least one of the light-emitting portions and the center of the light-exiting portion corresponding to the light-entering portion is inclined at an angle γ1 with respect to the optical axis of the optical lens.

4. The plurality of light emitting units are arranged in a matrix, The angle γ1 is a shortest distance L (0<L) from an optical axis of the optical lens to a center of a light-emitting surface of the light-emitting unit arranged at a corner of the matrix; a shortest distance x (0<x≦L) from the optical axis of the optical lens to the center of the light emitting surface of the light emitting unit provided corresponding to the light entrance unit having the inclined axis; an angle α (0°<α<180°) formed by a line connecting a center point, the center point being an intersection point between a plane on which the light-emitting surfaces of the plurality of light-emitting units extend and an optical axis of the optical lens, and a line connecting the center point and one of two points located diagonally across an area including all of the irradiation areas, and a line connecting the center point and the other of the two points; Using The light source device according to claim 3 , wherein:

5. the light converging unit includes a plurality of frustum-shaped lenses covering the light emitting surfaces of the plurality of light emitting units, the light entrance portion is a lower surface of the frustum-shaped lens, 5. The light source device according to claim 1, wherein the light exit portion is an upper surface of the frustum-shaped lens.

6. The light source device according to claim 5 , wherein the plurality of frustum-shaped lenses are integrated together.

7. The light source device according to claim 5 , wherein outer side surfaces of the plurality of frustum-shaped lenses are covered with a light-reflecting member.

8. the light converging section includes a plurality of hollow sections each having a first opening on the light emitting section side and a second opening on the optical lens side, the hollow sections being provided corresponding to the plurality of light emitting sections, the light entrance portion is the first opening of the cavity portion, 5. The light source device according to claim 1, wherein the light exit portion is the second opening of the cavity.

9. a first lens covering a plurality of light exit portions of the light converging portion; The light source device according to any one of claims 1 to 8, wherein the light emitted from each of the light exit portions of the light converging portion is incident on the first lens at a first half-value angle, is emitted from the first lens at a second half-value angle smaller than the first half-value angle, and is incident on the optical lens.

10. The light source device according to claim 9 , wherein the shortest distance between the first surface of the optical lens and the first lens is 0.1 mm or more and 1.0 mm or less.

11. The light source device according to claim 9 , wherein the shortest distance between the first surface of the optical lens and the first lens is 0.1 mm or more and 0.5 mm or less.

12. 12. The light source device according to claim 9, wherein the first lens collectively covers the plurality of light exit portions and has at least one convex surface facing the optical lens.

13. The light source device according to any one of claims 9 to 11, wherein the first lens collectively covers the plurality of light exit portions and includes unit first lenses provided corresponding to the respective light exit portions.

14. 12. The light source device according to claim 9, wherein the first lens includes a plurality of unit first lenses provided separately in correspondence with the plurality of light exit portions, respectively.

15. The light source device according to claim 13 , wherein an optical axis of at least one of the unit first lenses is inclined with respect to an optical axis of the optical lens.

16. The light source device according to any one of claims 13 to 15, wherein the unit first lens has a convex surface facing the optical lens.

17. The light source device according to any one of claims 13 to 15, wherein the unit first lenses are cylindrical lenses or frustum-shaped lenses.

18. The light source device according to any one of claims 13 to 15, wherein the unit first lens is an internal total reflection lens.

19. the internal total reflection lens has a rotationally asymmetric shape with respect to an optical axis of the internal total reflection lens; The light source device according to claim 18 , wherein the light exit portion of the light converging portion is covered by an inner surface of a recess provided on the internal total reflection lens on the light exit portion side of the light converging portion.

20. 20. The light source device according to claim 1, wherein the optical lens is composed of a plurality of lenses.

21. Each of the entrance areas of the optical lens is a first entrance area into which light emitted from a light-emitting portion corresponding to the entrance area is incident; a second entrance region into which light emitted from a light-emitting section adjacent to the light-emitting section is incident in addition to the light; The light source device according to any one of claims 1 to 20, comprising:

22. Each of the exit areas of the optical lens is a first exit area from which light that has entered the optical lens via an entrance area corresponding to the exit area exits; a second exit region from which light that has entered the optical lens from an entrance region adjacent to the entrance region exits in addition to the light; The light source device according to any one of claims 1 to 21, comprising:

23. The light source device according to any one of claims 1 to 22, wherein the light emitting section and the irradiation area illuminated by the light emitted from the light emitting section are arranged in a point-symmetrical relationship with respect to a point located on an axis connecting the center of the light entering section corresponding to the light emitting section and the center of the light exiting section corresponding to the light entering section.

24. The light source device according to claim 23 , wherein the one point corresponding to each of the plurality of light emitting portions is the same point.

25. The light source device according to any one of claims 1 to 24, wherein the plurality of light emitting sections are arranged in a matrix of m rows and n columns.

26. The light emitting unit includes a wavelength conversion member, The light source device according to any one of claims 1 to 25, wherein a light emitting surface of the light emitting portion is an upper surface of the wavelength conversion member.

27. The plurality of light emitting units are disposed on an upper surface of a substrate, a frame covering the plurality of light emitting units, the light converging unit, and the optical lens is provided on an upper surface of the substrate; 27. The light source device according to claim 1, wherein the height from the upper surface of the substrate to the uppermost surface of the frame is 2.0 mm or more and 10.0 mm or less.

28. The light source device according to any one of claims 1 to 27, wherein the plurality of light-emitting parts can be turned on individually.

29. The light source device according to any one of claims 1 to 28, wherein the light emitted from each of the light-emitting portions irradiates the irradiation area by intersecting the optical axis of the optical lens or by passing through the optical axis of the optical lens.

30. The light source device according to any one of claims 1 to 29, wherein the light source device is a flashlight.

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