Light source device

Abstract

The present disclosure relates to a light source device capable of irradiating a desired irradiation area with a sufficient amount of light. The light source device is used for irradiating light to more than two irradiation areas, and is provided with a plurality of light-emitting parts with light-emitting surfaces on the upper surfaces; and an optical lens located above the light-emitting surface of the light-emitting part, the optical lens including a first surface and a second surface, the first surface including a plurality of incident regions corresponding to the plurality of light-emitting parts and located on the light-emitting surface side of the light-emitting part, the light emitted from the light-emitting parts being incident to the incident regions, and the second surface being located on the light-emitting surface side of the light-emitting part. The second surface comprises a plurality of emergent areas respectively corresponding to the plurality of incident areas and is positioned on the opposite side of the first surface; and a light-condensing part located between the light-emitting part and the optical lens, the light-condensing part including a plurality of light-entering parts and a plurality of light-exiting parts, the plurality of light-entering parts being provided so as to correspond to the plurality of light-emitting parts, the light-entering parts covering the light-emitting surfaces of the light-emitting parts, the plurality of light-exiting parts being provided so as to correspond to the plurality of light-entering parts, and the light-exiting parts having an area smaller than that of the light-entering parts.

Description

[0001] This application is a divisional application of the invention patent application with application number 202110090562.X, application date January 22, 2021, applicant Nichia Chemical Corporation, and invention name “Light Source Device”. Technical Field

[0002] The present disclosure relates to a light source device. Background Art

[0003] In recent years, light sources using a plurality of light emitting units such as light emitting diodes have been widely used. For example, Patent Document 1 discloses a light source that can be used as a flash of a small camera such as a camera mounted on a mobile phone.

[0004] Patent Document 1: Japanese Patent No. 5275557

[0005] Such a light source, for example, a flash used in a camera, is required to illuminate a desired irradiation area among the individual irradiation areas obtained by dividing the entire irradiation area with a sufficient amount of light. Summary of the invention

[0006] Therefore, an object of the present disclosure is to provide a light source device that can illuminate a desired irradiation area with a sufficient amount of light.

[0007] A light source device according to one embodiment of the present disclosure is used for irradiating light to more than two irradiation areas, and the light source device comprises: a plurality of light-emitting parts having a light-emitting surface on an upper surface; an optical lens located above the light-emitting surface of the light-emitting part, and comprising a first surface and a second surface, the first surface comprising a plurality of incident areas and being located on the light-emitting surface side of the light-emitting part, the plurality of incident areas respectively corresponding to the plurality of light-emitting parts, and light emitted from the light-emitting part is incident on the incident areas, the second surface comprising a plurality of exit areas respectively corresponding to the plurality of incident areas and being located on the opposite side of the first surface; and a light-focusing part located between the light-emitting part and the optical lens, and comprising a plurality of light-input parts and a plurality of light-exit parts, the plurality of light-input parts being respectively arranged corresponding to the plurality of light-emitting parts, the light-input parts covering the light-emitting surface of the light-emitting part, the plurality of light-exit parts being respectively arranged corresponding to the plurality of light-input parts, and the light-exit parts having an area smaller than that of the light-input parts.

[0008] In addition, a light source device of one embodiment of the present disclosure is used to irradiate light to more than two irradiation areas, and the light source device comprises: a plurality of light-emitting portions having a light-emitting surface on an upper surface; an optical lens located above the light-emitting surface of the light-emitting portion, having a first surface including a first incident area and a second surface including a first exit area; and a focusing portion located between the light-emitting portion and the optical lens, having a plurality of light-input portions and a plurality of light-output portions, the plurality of light-input portions being respectively arranged corresponding to the plurality of light-emitting portions, the light-input portions covering the light-emitting surfaces of the light-emitting portions, the plurality of light-output portions being respectively arranged corresponding to the plurality of light-input portions, and the light-output portions having an area smaller than that of the light-input portions.

[0009] A light source device according to one embodiment of the present disclosure can irradiate a desired irradiation area with a sufficient amount of light. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a perspective view of a flashlight light source according to Embodiment 1 of the present disclosure.

[0011] Figure 2A yes Figure 1 The top view of the light emitting section of the flashlight light source shown is a diagram for explaining the arrangement of the light emitting section.

[0012] Figure 2B is Figure 1 In the illustrated flashlight light source, a top view of the light emitting section is shown in the case where the size of the light emitting surface of each light emitting section is different.

[0013] Figure 2C is Figure 1 In the illustrated flashlight light source, a top view of the light emitting section is shown in the case where the size of the light emitting surface of each light emitting section is different.

[0014] Figure 3 Yes Figure 1 The diagram shown is a diagram for explaining the relationship between a light emitting portion of a flash light source and an irradiation area provided corresponding to the light emitting portion.

[0015] Figure 4A yes Figure 1 A cross-sectional view of the flash light source taken along line AA is shown.

[0016] Figure 4B is Figure 1 Another cross-sectional view taken along line AA in the case where the central axes of all the unit light-collecting portions in the strobe light source are parallel to the optical axis of the optical lens.

[0017] Figure 4C Yes Figure 4A A portion of the cross-sectional view is shown in an enlarged view.

[0018] Figure 5 yes Figure 4A The cross-sectional view shown is an enlarged cross-sectional view of the light-emitting portion, the light-collecting portion and the first lens.

[0019] Fig. 6A It is magnified Figure 4A , which is a part of the figure, shows a situation where light from the central light-emitting portion is incident on the optical lens via the central unit focusing portion and the central unit first lens.

[0020] Figure 6B Indicated in Figure 4A In the cross-sectional view shown, the light emitted from the first lens of the central unit illuminates the corresponding illumination area via the optical lens.

[0021] Fig. 7A It is magnified Figure 4A The figure shows a part of the surrounding unit, which shows the situation where light from the surrounding light-emitting part is incident on the optical lens via the surrounding unit focusing part and the surrounding unit first lens.

[0022] Figure 7B Indicated in Figure 4A In the cross-sectional view shown, the light emitted from the first lens of the peripheral unit illuminates the corresponding illumination area via the optical lens.

[0023] Figure 8 It is a cross-sectional view of a flashlight light source according to Embodiment 2 of the present disclosure.

[0024] Fig. 9 It is a cross-sectional view of a flashlight light source according to Embodiment 3 of the present disclosure.

[0025] Fig.10 It is a cross-sectional view of a flashlight light source according to Modification 1 of the present disclosure.

[0026] Fig.11 It is a cross-sectional view of a flashlight light source according to Modification 2 of the present disclosure.

[0027] Fig.12 It is a cross-sectional view of a flashlight light source according to Modification 3 of the present disclosure.

[0028] Fig.13 It is a cross-sectional view of a flashlight light source according to Modification 4 of the present disclosure.

[0029] Fig.14 It is a cross-sectional view of a flashlight light source according to Modification 5 of the present disclosure.

[0030] Fig.15 It is a cross-sectional view of a unit light collecting portion and a unit first lens included in a strobe light source according to Modification 6 of the present disclosure.

[0031] Fig.16It is a cross-sectional view of a flashlight light source according to Modification 7 of the present disclosure.

[0032] Fig.17 It is a cross-sectional view of a flashlight light source according to another modified example of the present disclosure.

[0033] Fig.18 It is a cross-sectional view of a flashlight light source according to another modified example of the present disclosure.

[0034] Fig.19 It is a cross-sectional view of a flashlight light source according to another modified example of the present disclosure.

[0035] Fig. 20 Yes means Figure 1 The diagram shown is a graph of the shortest distance L, the shortest distance x, and the angle α among the flash light sources.

[0036] Explanation of reference numerals: 1, 201, 301, 401, 501, 601, 701, 801, 1001…light source; 2…substrate; 2a…upper surface; 3…housing; 4…opening; 5…supporting portion; 6A, 6B, 6C…leg portion; 7…joining member; 10, 510, 610, 710, 810…first lens; 610a, 710a, 810a…convex surface; 810d, 810e…top; 810c…concave surface; 810f…peripheral end; 11, 211, 311, 411, 511, 911…unit first lens; 12…upper surface; 13, 913…lower surface ; 14, 914…recess; 14a, 914a…inner surface of the recess; 15…inner side surface; 16, 916…connecting portion; 511a…convex surface; 20…first lens of the central unit; 21…upper surface; 22…lower surface; 23…recess; 23a…inner surface; 24…inner side surface; 25…first lens of the peripheral unit; 26…upper surface; 28…recess; 28a…inner surface; 29…inner side surface; 30, 1130, 1230…optical lens; 31…first surface; 33…incident area; 33a…(center) incident area; 33b…(peripheral) incident area; 33c…first incident area; 33d…second incident region; 32…second surface; 34…exit region; 34a…exit region; 34b…exit region; 34c…first exit region; 34d…second exit region; 36, 1236…first optical lens; 37, 1237…second optical lens; 38…third optical lens; 41, 1041…light emitting portion; 41a, 41a2, 41b1, 41b2, 50A1, 50B1, 1041a…light emitting surface; 42…light emitting element; 43…semiconductor stack; 44…electrode; 45, 1045…wavelength conversion component; 46…light reflecting component; 50, 50A, 50B…central light-emitting portion; 55…peripheral light-emitting portion; 60…light-emitting portion; 70…light-collecting portion; 71, 81, 86…light-entering portion; 72, 82, 87…light-exiting portion; 75, 75A…unit light-collecting portion; 78…inner side surface; 79…outer side surface; 80…central unit light-collecting portion; 83…inner side surface; 85…unit light-collecting portion; 88…inner side surface; 375…hollow portion; 376…first opening portion; 377…second opening portion; B1, B2, B5~B9…optical axis; C1, C2, C3…central axis; O…one point; P…midpoint; R1…region; R33, R35, R42…irradiated region. DETAILED DESCRIPTION

[0037] Hereinafter, embodiments and examples for implementing the invention disclosed herein will be described with reference to the accompanying drawings. In addition, the flashlight light source, which is an example of the light source device disclosed herein, described below, is used to embody the technical concept of the invention disclosed herein, and the invention disclosed herein is not limited to the following contents unless otherwise specified.

[0038] In the various drawings, the same reference numerals are sometimes used to indicate components with the same functions. In order to facilitate the description or understanding of the key points, the components are sometimes divided into implementation modes or examples for presentation, but partial substitution or combination of the structures shown in different implementation modes or examples may also be performed. In the implementation modes or examples described later, the description of matters common to the aforementioned matters is omitted, and only the different points are described. In particular, the same effects based on the same structure are not mentioned sequentially in each implementation mode or example. The size, positional relationship, etc. of the components shown in the various drawings are sometimes exaggerated to make the description clear.

[0039] For example, in the light source used for a camera flash, the larger the number of divisions into which the overall illumination area is divided, the more finely the illumination area illuminated by light and the illumination area not illuminated by light can be distinguished, and a clearer photograph of the subject can be obtained.

[0040] However, if the number of divisions is increased and the irradiation area is subdivided as a whole, the range of each irradiation area becomes smaller, and it is difficult to focus the light emitted from each light emitting unit to the desired irradiation area through an optical lens (for example, a camera lens), and it is difficult to irradiate the desired irradiation area with a sufficient amount of light. The inventors conducted in-depth research to solve this problem.

[0041] As a result, the inventors discovered

[0042] (1) By collecting the light emitted from the light emitting section, the amount of light per unit area is increased, and the brightness of the light illuminating the desired irradiation area can be improved.

[0043] In addition, it was found that (2) in addition to the optical lens, another lens (first lens) was also used to narrow the half-value full angle (directional half-value full angle) of the light emitted from each light-emitting portion of the above-mentioned (1), so that the light incident on the optical lens has directionality, thereby being able to irradiate the desired irradiation area with a sufficient amount of light.

[0044] A light source device according to one embodiment of the present disclosure is completed based on the above-mentioned findings, and provides a light source device for irradiating light to more than two irradiation areas, comprising: a plurality of light-emitting parts having a light-emitting surface on an upper surface; an optical lens located above the light-emitting surface of the light-emitting part, comprising a first surface and a second surface, the first surface including a plurality of incident areas and located on the light-emitting surface side of the light-emitting part, the plurality of incident areas corresponding to the plurality of light-emitting parts, respectively, and light emitted from the light-emitting part is incident on the incident areas, the second surface including a plurality of exit areas corresponding to the plurality of incident areas, respectively, and located on the opposite side of the first surface; and a focusing part located between the light-emitting part and the optical lens, comprising a plurality of light-input parts and a plurality of light-exit parts, the plurality of light-input parts are respectively arranged corresponding to the plurality of light-emitting parts, the light-input parts cover the light-emitting surface of the light-emitting part, the plurality of light-exit parts are respectively arranged corresponding to the plurality of light-input parts, and the light-exit parts have an area smaller than that of the light-input parts.

[0045] In addition, other embodiments of the light source device disclosed in the present invention are completed based on the above-mentioned insights, and provide a light source device for irradiating light to more than two irradiation areas, comprising: a plurality of light-emitting units having a light-emitting surface on the upper surface; an optical lens located above the light-emitting surface of the light-emitting unit, having a first surface including a first incident area and a second surface including a first exit area; and a focusing unit located between the light-emitting unit and the optical lens, having a plurality of light-input units and a plurality of light-output units, the plurality of light-input units are respectively arranged corresponding to the plurality of light-emitting units, the light-input units cover the light-emitting surfaces of the light-emitting units, and the plurality of light-output units are respectively arranged corresponding to the plurality of light-input units, and the light-output units have an area smaller than that of the light-input units.

[0046] Implementation

[0047] 1. Implementation Method 1

[0048] Hereinafter, as an example of the light source device disclosed in the present invention, Figure 1 The flashlight light source according to the first embodiment of the present disclosure will be described.

[0049] The light source 1 of the present embodiment is a light source for causing the light emitted from the light emitting portion to illuminate more than two illumination areas. Here, the illumination area refers to an area with a certain direction as the center and an extension around it. In the present embodiment, the more than two illumination areas refer to areas where, when more than two light emitting portions are individually lit, the centers of the respective illumination areas are separated by a specified distance, have a specified size, and are independently illuminated by the light emitted from the light emitting portions. In addition, this means that it is not an area illuminated by the light emitted from more than two light emitting portions, but rather each area is independently illuminated by the light emitted from more than two light emitting portions. In the light source 1 of the present embodiment, as described later, a plurality of light emitting portions are provided corresponding to a plurality of illumination areas in different directions. Thus, by selecting one or more of the plurality of light emitting portions and lighting them, it is possible to irradiate light to the desired illumination area. As Figure 1 and Figure 4A As shown, the light source 1 includes a substrate 2, 25 light emitting units 41, a light collecting unit 70, a first lens 10, and an optical lens 30. The optical lens 30 collects or projects light emitted from the light emitting unit 41 toward a corresponding irradiation area.

[0050] Twenty-five light emitting sections 41 are arranged on the upper surface 2 a of the substrate 2 .

[0051] The focusing portion 70 includes 25 unit focusing portions 75, each of which has: a light input portion 71 arranged corresponding to each light emitting portion 41 and covering the light emitting surface 41a of each light emitting portion 41; and a light output portion 72 arranged corresponding to each light input portion 71 and having an area smaller than the area of ​​each light input portion 71.

[0052] The first lens 10 includes 25 unit first lenses 11 , which are arranged corresponding to the unit light-focusing portions 75 and cover the light-emitting portions 72 of the unit light-focusing portions 75 .

[0053] The optical lens 30 is arranged above the light emitting surface 41a of the light emitting portion 41. The optical lens 30 has a first surface 31 on the light emitting surface 41a side of the light emitting portion 41, and a second surface 32 on the opposite side to the first surface 31. The first surface 31 includes a plurality of incident areas 33, each corresponding to the light emitting portion 41, and light emitted from the light emitting portion is incident on the incident area 33. The second surface 32 includes a plurality of exit areas 34 corresponding to each incident area 33. In addition, the incident area 33 and the exit area 34 shown in the figure are exaggeratedly drawn to represent the area.

[0054] The light emitted from each light emitting unit 41 enters the optical lens 30 via the condensing unit 70 and the first lens 10 , and then is emitted from the optical lens 30 to illuminate the illumination area arranged corresponding to each light emitting unit 41 .

[0055] In addition, in the present embodiment, the housing 3 covering the 25 light emitting units 41 , the light collecting unit 70 , the first lens 10 , and the optical lens 30 is disposed on the upper surface 2 a of the substrate 2 .

[0056] In order to facilitate understanding of the internal structure of the light source 1, the Figure 1 The optical lens 30 and a portion of the housing 3 are shown in cross section.

[0057] Here, for example, the unit light focusing portion 75 is disposed “correspondingly” to the light emitting portion 41, which means that the unit light focusing portion 75 and the light emitting portion 41 are disposed in a one-to-one relationship in order to allow the light emitted from the light emitting portion 41 to enter from the light entrance portion 71 and exit from the light exit portion 72 toward the optical lens 30 or the unit first lens 11. In addition, for example, the emission region 34 “corresponding” to the incident region 33 refers to a region that allows the light incident from the incident region 33 to be emitted to the outside of the optical lens 30, and is a region disposed in a one-to-one relationship with the incident region 33. And, for example, the irradiation region “corresponding” to the light emitting portion 41 refers to a region that is the irradiation destination of the light emitted from the light emitting portion 41, and is a region disposed in a one-to-one relationship with the light emitting portion 41.

[0058] As such, in this specification, "correspondence" refers to a relationship between mutually related components and components, regions and regions, components and regions, and the like.

[0059] (Arrangement of light-emitting parts)

[0060] like Figure 2A As shown, 25 light-emitting units 41 are arranged in a matrix of 5 rows and 5 columns. The light-emitting unit located at the center of the 25 light-emitting units 41 is the central light-emitting unit 50 arranged in the 3rd row and 3rd column. In the present embodiment, the top view shape of each light-emitting unit 41 (including the central light-emitting unit 50) is a square, and adjacent light-emitting units 41 are arranged in contact with each other, but are not limited to this. For example, the top view shape of the light-emitting unit 41 may also be a rectangle, a circle, a polygon, etc. For example, adjacent light-emitting units 41 may also be arranged isolated from each other. In addition, the top view shape of each light-emitting surface 41a of each light-emitting unit 41 may also be similar. For example, it may also be as follows Figure 2B As shown in FIG. 1 , as the distance from the central light emitting portion 50A increases, the size of the light emitting surface 50A1, 41a1, 41a2 decreases. Figure 2C As shown, the size of the light-emitting surface 50B1, 41b1, and 41b2 increases as the distance from the central light-emitting portion 50B increases. That is, the size of the light-emitting surface 41a of each light-emitting portion 41 may also be different depending on the location where the light-emitting portion 41 is arranged in the matrix arrangement. Here, the farther the light-emitting portion 41 is arranged from the optical axis of the optical lens 30, the longer the distance to the corresponding irradiation area, making it difficult to control the light distribution and causing a tendency for light loss to increase. Therefore, Figure 2C As shown, the light emitting portions 41b1 and 41b2 are made larger as the light emitting portions 41 are further away from the central light emitting portion 50B, thereby increasing the amount of light in the light emitting portions 41 far away from the central light emitting portion 50B and suppressing a decrease in brightness.

[0061] Moreover, the number of the light-emitting units 41 is not limited to 25, as long as it is 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 not be a matrix arrangement. For example, 4 light-emitting units 41 of 2 rows and 2 columns may be arranged, 12 other light-emitting units 41 of 4 on one side of the periphery of the 4 light-emitting units 41 may be arranged, and 8 other light-emitting units 41 of 2 on one side of the periphery except for the corners may be arranged. Thus, the plurality of light-emitting units 41 may be arranged in a shape close to a circle when viewed from above, so that the optical lens 30 is circular when viewed from above, thereby enabling the light from the plurality of light-emitting units 41 to be efficiently incident on the optical lens 30. Furthermore, depending on the number of light-emitting units 41 and / or the arrangement of the light-emitting units 41, the number of central light-emitting units may also be 2 or more. In addition, the distances between adjacent light-emitting units 41 or the distances between adjacent light-emitting surfaces 41a may also be different. That is, the distance between two adjacent light emitting units 41 or the distance between two light emitting surfaces 41 a in the row direction may be shorter than the distance between two adjacent light emitting units 41 or the distance between two light emitting surfaces 41 a in the column direction.

[0062] (Arrangement of irradiation areas)

[0063] like Figure 3 As shown, the light source 1 of this embodiment irradiates light to the region R1 divided into 25 irradiation regions. In order to facilitate the understanding of the content of the invention, the region R1 and each irradiation region are schematically depicted from a top view. The 25 irradiation regions are arranged in a matrix of 5 rows and 5 columns. One irradiation region is provided corresponding to one light emitting unit 41 and is irradiated by the light emitted from the corresponding light emitting unit 41.

[0064] In the present embodiment, 25 irradiation areas are arranged in a matrix, but the arrangement is not limited thereto. For example, the number of irradiation areas may be 2 or more. However, the number of irradiation areas is preferably the same as the number of light-emitting units 41. Furthermore, the arrangement of the plurality of irradiation areas 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 not be a matrix arrangement. However, the arrangement of the irradiation areas is preferably the same as the arrangement of the light-emitting units 41.

[0065] (Arrangement relationship between the light emitting unit and the irradiation area)

[0066] In this embodiment, if Figure 3As shown, the configuration relationship between each light-emitting section 41 and the irradiation area corresponding to the light-emitting section is a point-symmetrical relationship with respect to a point O located directly above the midpoint P of the light-emitting surface 50a of the central light-emitting section 50. That is, each light-emitting section 41 and the irradiation area irradiated by the light emitted from the light-emitting section are in a point-symmetrical configuration relationship with respect to a point inherent to the light-emitting section 41, and the point inherent to each of the plurality of light-emitting sections is the same point (point O). For example, the irradiation area R33 of the 25 irradiation areas configured in the 3rd row and the 3rd column is an irradiation area corresponding to the central light-emitting section 50 configured in the 3rd row and the 3rd column among the 25 light-emitting sections 41. For example, the irradiation area R35 of the 25 irradiation areas configured in the 3rd row and the 5th column is an irradiation area corresponding to the light-emitting section 55 configured in the 3rd row and the 1st column among the 25 light-emitting sections 41. For example, the irradiation area R42 of the 25 irradiation areas configured in the 4th row and the 2nd column is an irradiation area corresponding to the light-emitting section 60 configured in the 2nd row and the 4th column among the 25 light-emitting sections 41.

[0067] As described above, the light emitting section 41 and the corresponding irradiation area are arranged in a one-to-one relationship, but this is not limited to the fact that the light emitted from the light emitting section 41 actually only irradiates the corresponding irradiation area. The irradiation area corresponding to the light emitting section 41 is the irradiation area that is the irradiation target of the light emitting section 41. Therefore, in fact, the light emitted from one light emitting section 41 can also irradiate the adjacent irradiation area (or the nearby irradiation area). In other words, Figure 3 As shown, one irradiation area may also include: an area (first irradiation area) R1A irradiated only by light emitted from the corresponding light emitting section 41; and an area (second irradiation area) R1B irradiated by light emitted from the corresponding light emitting section 41 and light emitted from a light emitting section 41 adjacent to the corresponding light emitting section 41 (or a light emitting section 41 nearby). In addition, one irradiation area may not include the first irradiation area R1A, but only include the second irradiation area R1B.

[0068] In the above description, the arrangement relationship between each light emitting section 41 and the irradiation area corresponding to the light emitting section 41 adopts a point-symmetric relationship with respect to a point O, but the present invention is not limited to this.

[0069] For example, the point serving as a reference for point symmetry may be different for each light-emitting portion 41. That is, each light-emitting portion 41 and the irradiation area irradiated by the light emitted from the light-emitting portion are in a point-symmetrical configuration relationship with respect to a point inherent to the light-emitting portion 41. And, the inherent point is, for example, located on an axis connecting the center of the light input portion 71 corresponding to the light-emitting portion 41 and the center of the light output portion 72 corresponding to the light input portion 71. Therefore, the light-emitting portion 41 and the irradiation area irradiated by the light emitted from the light-emitting portion 41 may also be in a point-symmetrical configuration relationship with respect to a point located on an axis connecting the center of the light input portion 71 corresponding to the light-emitting portion 41 and the center of the light output portion 72 corresponding to the light input portion 71. In addition, the axis is the central axis C1 of the unit focusing portion 75. Moreover, the above-mentioned point corresponding to each of the plurality of light-emitting portions 41 may also be the same point.

[0070] In addition, for example, the point that serves as a reference of point symmetry (in the case of the present embodiment, one point O) may not be arranged on the optical axis B2 of the optical lens 30 .

[0071] (Distribution of light emitted from each light emitting unit)

[0072] Next, refer to Figure 1 , the light distribution until the light emitted from the light emitting unit 41 illuminates the corresponding irradiation area is described in detail.

[0073] The light emitted from the light emitting surface 41a of the light emitting portion 41 first enters the unit light focusing portion 75 of the light focusing portion 70, and the light quantity per unit area is increased by the unit light focusing portion 75. That is, the light quantity per unit area (second light quantity) φ2 of the light emitted from the light emitting portion 72 of the unit light focusing portion 75 is larger than the light quantity per unit area (first light quantity) φ1 of the light incident on the light incident portion 71 of the unit light focusing portion 75. The light after the light quantity per unit area is increased by the unit light focusing portion 75 is preferably emitted from the light emitting portion 72 of the unit light focusing portion 75 at the first half-value full angle θ1, and is incident on the corresponding unit first lens 11. The half-value full angle of the light incident on the unit first lens 11 is narrowed to a second half-value full angle θ2 which is smaller than the first half-value full angle θ1. The light emitted from the unit first lens 11 at the second half-value full angle θ2 is incident on the optical lens 30 from the incident area 33 provided corresponding to each light emitting portion 41. The light incident on the optical lens 30 is emitted to the outside of the optical lens 30 from the emission areas 34 provided corresponding to the incident areas 33 , for example, illuminating the irradiation areas arranged at positions point-symmetrical to the light emitting portions 41 with respect to a point O.

[0074] As described later, the illustrated point O is a point on the optical axis B2 of the optical lens 30. Therefore, the light emitted from the central light-emitting portion 50 is emitted along the optical axis B2 of the optical lens 30, that is, in a direction substantially parallel to the optical axis B2, and illuminates the irradiation area R33 located directly above, and the light emitted from the light-emitting portions other than the central light-emitting portion 50 illuminates the corresponding irradiation area after crossing the optical axis B2 of the optical lens 30. Here, in this specification, "along the optical axis of the optical lens" particularly refers to "through the optical axis of the optical lens".

[0075] In addition, in the present embodiment, the light-emitting portion 41 and the corresponding irradiation area are arranged at a position that is point-symmetrical with respect to a point O located directly above the central light-emitting portion 50, and the light emitted from the light-emitting portion 41 other than the central light-emitting portion 50 intersects with the optical axis B2 of the optical lens 30 to illuminate the corresponding irradiation area, but which light-emitting portion 41 intersects with the optical axis B2 of the optical lens 30 varies depending on the configuration relationship between the light-emitting portion 41 and the irradiation area.

[0076] That is, in the present embodiment, the lights emitted from the plurality of light emitting units 41 intersect with the optical axis B2 of the optical lens 30 or pass through the optical axis B2 of the optical lens 30 to illuminate the irradiation area.

[0077] In the light source 1 disclosed in the present embodiment, as one of the elements for irradiating the light emitted from each light emitting portion 41 to the corresponding irradiation area, the shape of the incident area 33 in the first surface 31 of the optical lens 30 and the shape of the exit area 34 in the second surface 32 are listed. Specifically, the light emitted from each light emitting portion 41 is irradiated to the corresponding irradiation area by refraction of the light in the incident area 33 and refraction of the light in the exit area 34. Therefore, the shape of the incident area 33 in the first surface 31 and the shape of the exit area 34 in the second surface 32 are set.

[0078] The refraction in the incident area 33 of the optical lens 30 and the refraction in the exit area 34 are obtained based on 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 incident area 33 and the shape of the second surface 32 including the exit area 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 that should be considered. In the light source 1 of the present embodiment, the medium in contact with the optical lens 30 is a space, for example, air is located in the space. Therefore, in the present 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.

[0079] The light incident on the optical lens 30 is incident through the first unit lens 11. Therefore, as a factor for irradiating the light emitted from the light emitting section 41 to the corresponding irradiation area, the light distribution characteristics of the first unit lens 11 are also mentioned.

[0080] Specifically, it refers to the emission direction (directivity) of light emitted from the first unit lens 11 , and this emission direction sets the direction of the optical axis of the first unit lens 11 .

[0081] In this way, the shapes of the first surface 31 and the second surface 32 of the optical lens 30 are set so that the light emitted from the light emitting portion 41 is irradiated to the corresponding irradiation area. In addition, 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 that can be set. In addition, the light incident on the optical lens 30 is the light emitted from the unit first lens 11, so the emission direction of the light emitted from the unit first lens 11 can also be a parameter.

[0082] In this way, the shape of the incident region 33 and the shape of the emission region 34 are set by, for example, simulation in consideration of the parameters exemplified above.

[0083] Below, refer to Figure 1 , Figure 4A and Figure 5 , and explain each component in detail.

[0084] (Substrate)

[0085] The substrate 2 is a wiring substrate having connection electrodes on the upper surface 2a. The connection electrodes are connected to electrodes 44 of the light emitting unit 41 described later.

[0086] (case)

[0087] like Figure 1 and Figure 4A As shown, a shell 3 is arranged on the upper surface 2a of the substrate 2. The interior of the shell 3 is hollow, and has an opening 4 at the top. The shell 3 preferably has a light-absorbing component that does not reflect light on the inner surface. The light-absorbing component is formed of, for example, polycarbonate, silicone resin, PPS (Poly Phenilen Sarphayed), PA (polyamide), or LCP (Liquid Crystal Plastic). In addition, the entire shell 3 can also be formed of a light-absorbing component. A light-emitting portion 41, a focusing portion 70, a first lens 10, and an optical lens 30 are arranged in the hollow of the shell 3.

[0088] The height from the upper surface 2a of the substrate 2 to the uppermost surface of the housing 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 uppermost surface of the housing 3 to such a height, the light source device 1 can be mounted on a small electronic device such as a smartphone.

[0089] (Luminous part)

[0090] like Figure 5 As shown, the light emitting unit 41 includes a light emitting element 42 , a wavelength converting 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 wavelength converting member 45 .

[0091] The light emitting element 42 has at least a semiconductor stack 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 the connection electrode of the substrate 2. The light emitting element 42 preferably emits light mainly from the surface opposite to the surface provided with the electrode 44 (hereinafter referred to as the upper surface of the light emitting element 42) when it is mounted upside down.

[0092] The light reflective member 46 is, for example, a white resin containing a light diffusing material such as titanium oxide. In this way, by covering the side surface of the light emitting element 42 with the light reflective member 46, the light emitted from the side surface 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. That is, the light emitted from the light emitting element 42 can be efficiently used.

[0093] The wavelength conversion member 45 is made of, for example, a silicone resin containing a fluorescent substance, etc. The upper surface of the wavelength conversion member 45 can be made into 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, light of a desired wavelength range can be emitted from the light emitting surface 41a of the light emitting unit 41.

[0094] The light emitting units 41 configured in this manner can be individually controlled to light up. That is, the plurality of light emitting units 41 can be individually lit up.

[0095] (Spotlight Department)

[0096] like Figure 1 As shown, the focusing portion 70 includes 25 unit focusing portions 75. The unit focusing portion 75 of this embodiment is a truncated cone-shaped lens with a rectangular upper surface and a rectangular lower surface. The area of ​​the upper surface of the truncated cone-shaped lens is smaller than the area of ​​the lower surface, and it becomes tapered from the lower surface to the upper surface. The light input portion 71 of the unit focusing portion 75 is the lower surface of the truncated cone-shaped lens, and the light output portion 72 of the unit focusing portion 75 is the upper surface of the truncated cone-shaped lens.

[0097] In addition, the shapes of the lower surface and the upper surface of the unit light focusing portion 75 are not limited to the rectangular shape, and may be circular, triangular, polygonal, or the like.

[0098] The unit light focusing portion 75, which is a truncated cone lens, is configured to cover the light emitting surface 41a of the corresponding light emitting portion 41 with the light incident portion 71. The 25 unit light focusing portions 75 of this embodiment are connected to each other on the lower surface side and are an integrated component. Therefore, the light focusing portion 70 can be formed as a single lens. However, the 25 unit light focusing portions 75 can also be individual components that are isolated from each other.

[0099] The unit light focusing portion 75 is provided to increase the amount of light per unit area by making the area of ​​the light exiting portion 72 smaller than the area of ​​the light entering portion 71 and by utilizing the inner side surface 78 of the unit light focusing portion 75 to totally reflect the light entering the unit light focusing portion 75. Therefore, the shape of the unit light focusing 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 focusing portion 75 and the refractive index of the medium in contact with the unit light focusing portion 75 are appropriately set. In the light source 1 of the present embodiment, the medium in contact with the unit light focusing portion 75 is a space, for example, air is located in the space. Therefore, the refractive index difference between the refractive index of the unit light focusing portion 75 and the medium in contact with the truncated cone lens is the refractive index difference between the truncated cone lens and air.

[0100] By utilizing the focusing portion 70 composed of such unit focusing portions 75, the amount of light emitted from the light emitting portion 41 per unit area can be increased. In addition, by utilizing the focusing portion 70, a light emitting portion having a larger light emitting surface can be used compared to a case where the focusing portion 70 is not utilized. A light emitting portion having a larger light emitting surface refers to a light emitting portion having a larger size. In the field of promoting miniaturization of light sources, the ability to use a light emitting portion having a larger size is advantageous in product manufacturing. In addition, the light extraction efficiency can also be improved thereby.

[0101] like Figure 4A As shown, the center axis C1 of the unit light-gathering portion 75 corresponding to the light-emitting portion other than the central light-emitting portion 50 can be tilted relative to the optical axis B2 of the optical lens 30 described later. Here, the center axis C1 of the unit light-gathering portion 75 is an axis connecting the center of the light-entering portion 71 and the center of the light-emitting portion 72 of the unit light-gathering portion 75, and in the present embodiment, is the optical axis of the frustum-shaped lens. In addition, in the present specification, "tilting" of an axis (center axis or optical axis) and an axis (center axis or optical axis) means that the two axes cross at an angle, that is, the two axes are not parallel. The angle at which the center axis C1 of the unit light-gathering portion 75 is tilted relative to the optical axis B2 of the optical lens 30 can be appropriately set according to the configuration relationship between the light-emitting portion 41 on which the unit light-gathering portion 75 is configured and the irradiation area corresponding to the light-emitting portion.

[0102] As described above, in the present embodiment, the 25 light emitting sections 41 and the irradiation regions corresponding to the respective light emitting sections 41 have a point-symmetrical arrangement relationship with respect to the point O above the central light emitting section 50 .

[0103] Therefore, the angle at which the central axis C1 of each unit light focusing portion 75 is inclined relative 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 focusing portion 75 ) can be set as follows.

[0104] (1) The inclination angle of the central axis C1 of the unit light focusing portion 75 arranged in the third row and the second column and the inclination angle of the central axis C1 of the unit light focusing portion 75 arranged in the third row and the fourth column are the same inclination angle (first inclination angle);

[0105] (2) the inclination angle of the central axis C1 of the unit light focusing portion 75 arranged in the second row and third column and the inclination angle of the central axis C1 of the unit light focusing portion 75 arranged in the fourth row and third column are the same inclination angle (second inclination angle);

[0106] (3) the inclination angle of the central axis C1 of the unit light focusing portion 75 arranged in the second row and the second column, the inclination angle of the central axis C1 of the unit light focusing portion 75 arranged in the second row and the fourth column, the inclination angle of the central axis C1 of the unit light focusing portion 75 arranged in the fourth row and the second column, and the inclination angle of the central axis C1 of the unit light focusing portion 75 arranged in the fourth row and the fourth column are the same inclination angle (third inclination angle);

[0107] (4) the inclination angle of the central axis C1 of the unit light focusing portion 75 arranged in the third row and the first column and the inclination angle of the central axis C1 of the unit light focusing portion 75 arranged in the third row and the fifth column are the same inclination angle (fourth inclination angle);

[0108] (5) The inclination angle of the central axis C1 of the unit light focusing portion 75 arranged in the first row and third column and the inclination angle of the central axis C1 of the unit light focusing portion 75 arranged in the fifth row and third column are the same inclination angle (fifth inclination angle);

[0109] (6) the inclination angle of the central axis C1 of the unit light focusing portion 75 arranged in the second row and the first column, the inclination angle of the central axis C1 of the unit light focusing portion 75 arranged in the second row and the fifth column, the inclination angle of the central axis C1 of the unit light focusing portion 75 arranged in the fourth row and the first column, and the inclination angle of the central axis C1 of the unit light focusing portion 75 arranged in the fourth row and the fifth column are the same inclination angle (sixth inclination angle);

[0110] (7) the inclination angle of the central axis C1 of the unit light focusing portion 75 arranged in the first row and second column, the inclination angle of the central axis C1 of the unit light focusing portion 75 arranged in the first row and fourth column, the inclination angle of the central axis C1 of the unit light focusing portion 75 arranged in the fifth row and second column, and the inclination angle of the central axis C1 of the unit light focusing portion 75 arranged in the fifth row and fourth column are the same inclination angle (seventh inclination angle);

[0111] (8) the inclination angle of the central axis C1 of the unit light focusing portion 75 arranged in the first row and the first column, the inclination angle of the central axis C1 of the unit light focusing portion 75 arranged in the first row and the fifth column, the inclination angle of the central axis C1 of the unit light focusing portion 75 arranged in the fifth row and the first column, and the inclination angle of the central axis C1 of the unit light focusing portion 75 arranged in the fifth row and the fifth column are the same inclination angle (eighth inclination angle);

[0112] (9) The central axis C1 of the unit light focusing portion (central unit light focusing portion 80 ) corresponding to the central light emitting portion 50 is arranged on the optical axis B2 of the optical lens 30 .

[0113] Furthermore, when the top view shape of the light emitting portion 41 is a square and the light emitting surfaces 41a of the light emitting portions 41 have the same size,

[0114] (a) the first inclination angle and the second inclination angle are the same inclination angle;

[0115] (b) the fourth inclination angle and the fifth inclination angle are the same inclination angle;

[0116] (c) The sixth inclination angle and the seventh inclination angle are the same inclination angle:

[0117] (d) the third inclination angle is set larger than the first inclination angle and the second inclination angle;

[0118] (e) the fourth inclination angle and the fifth inclination angle are set larger than the first inclination angle and the second inclination angle;

[0119] (f) the sixth inclination angle and the seventh inclination angle are set larger than the fourth inclination angle and the fifth inclination angle;

[0120] (g) The eighth inclination angle is set larger than the sixth inclination angle and the seventh inclination angle.

[0121] When the light emitting units 41 are arranged in a matrix, Fig. 20 The central axis C1 of at least one unit light focusing portion 75 is inclined at an angle γ1 (see Figure 4C ) is a specific calculation method. In addition, Fig. 20In order to facilitate understanding of the drawings, the unit light focusing portion 75 and the unit first lens 11 are omitted.

[0122] When the light emitting units 41 are arranged in a matrix,

[0123] (i) 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 portion 41 arranged at the corner of the matrix is ​​set to L;

[0124] (ii) 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 portion 41 provided corresponding to the light incident portion 71 having the inclined axis (central axis C1) is set to x (0<x≤L);

[0125] (iii) The intersection of the plane where the light emitting surfaces 41a of the plurality of light emitting units 41 extend and the optical axis B2 of the optical lens 30 (at Fig. 20 In the example shown, when the center P) of the light-emitting surface 50a of the central light-emitting portion 50 is set as the center point Q0, the angle formed by the straight line S1 connecting the center point Q0 and one point Q1 of the two diagonal points located in the area R1 (including all the 2 or more irradiation areas) and the straight line S2 connecting the center point Q0 and the other point Q2 of the two points is set to α (0°<α<180°);

[0126] The angle γ1 can be calculated using the following formula 1, for example.

[0127] Furthermore, the light emitting units 41 located at the corners of the matrix are the light emitting units 41 located at the four corners of the matrix. Therefore, for example, in the case of a matrix of 5 rows and 5 columns, the light emitting units 41 located at the corners of the matrix are the light emitting units 41 in the 1st row and 1st column, the light emitting units 41 in the 1st row and 5th column, the light emitting units 41 in the 5th row and 1st column, or the light emitting units 41 in the 5th row and 5th column.

[0128] [Mathematical formula 1]

[0129]

[0130] In this way, according to the configuration relationship between the light-emitting portion 41 corresponding to the unit focusing portion 75 and the irradiation area corresponding to the light-emitting portion, the center axis C1 of the unit focusing portion 75 is appropriately tilted relative to the optical axis B2 of the optical lens 30, so that the light emitted from the light-emitting portion 41 can be more efficiently irradiated to the corresponding irradiation area.

[0131] When the central axis C1 of the unit light focusing portion 75 is tilted toward the optical axis B2 of the optical lens 30, the tilt angle of the central axis C1 is a factor to be considered when determining the tilt angle of the optical axis B1 of the corresponding unit first lens 11. Therefore, the tilt angle of the central axis C1 of the unit light focusing portion 75 relative to the optical axis B2 of the optical lens 30 is also a parameter to be considered in order to set the shape of the incident area 33 and the shape of the exit area 34 of the above-mentioned optical lens 30.

[0132] In the above description, the case where the central axis C1 of the unit light focusing portion 75 other than the central unit light focusing portion 80 is inclined relative to the optical axis B2 of the optical lens 30 is described, but the central axis C1 of the unit light focusing portion 75 other than the central unit light focusing portion 80 may also be parallel to the optical axis B2 of the optical lens 30. In this case, it is preferred that Figure 4B As shown, the central axis C2 of all the unit light focusing portions 75A including the central unit light focusing portion 80 is parallel to the optical axis B2 of the optical lens 30. As a result, the light intensity on the upper surface of the light emitting element 42 of the light emitting portion 41, especially directly above, is large, so that light can be efficiently extracted through the unit light focusing portion 75 having the central axis C1 parallel to the optical axis B2 of the optical lens 30. In addition, since the shape of such a light focusing portion 70A is simple, it is easy to form a mold for forming the unit light focusing portion 75A.

[0133] (First lens)

[0134] The first lens 10 is provided to narrow the half-value full angle of the light emitted from the light emitting portion 72 of the unit light focusing portion 75 and to provide directivity toward the irradiation area corresponding to the light. The first lens 10 of this embodiment includes 25 unit first lenses 11 provided for each unit light focusing portion 75 and corresponding to the light emitting portion 72 of the unit light focusing portion 75. Figure 1 As shown in FIG. 1 , the unit first lenses 11 are separately arranged. However, it is also possible to Fig.11 In this way, the unit first lens 11 is a component connected and integrated with the adjacent unit first lens. In this way, the first lens 10 formed by integrating the unit first lenses can be said to be a single lens including 25 unit first lenses 11 provided for each unit light focusing portion 75, which covers the light emitting portion 72 of the 25 unit light focusing portions 75 at once.

[0135] The first unit lens 11 of this embodiment is a total internal reflection lens (Total Internal Reflection lens, TIR lens). Here, the total internal reflection lens refers to a lens that can adjust the directivity of light by total reflection inside the lens. Figure 5As shown, the internal total reflection lens used in this embodiment has a lower surface 13 with a concave portion 14 and an upper surface 12 with a corrugated cross-sectional shape, and is a lens in a substantially truncated cone shape that tapers from the upper surface 12 toward the lower surface 13. The internal total reflection lens used in this embodiment is a rotationally symmetrical shape centered on the optical axis B1.

[0136] The internal total reflection lens, i.e., the first lens unit 11, is configured 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 light emitting surface 41a is covered by the inner surface 14a. That is, the first lens unit 11 is configured such that the opening end portion 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.

[0137] Next, refer to Figure 1 , Figure 2A and Figure 4A , the extending direction of the optical axis B1 of the first lens unit 11 is described.

[0138] like Figure 2A As shown in FIG. 1 , the first unit lenses 11 respectively arranged corresponding to the unit focusing portions 75 arranged in a matrix of 5 rows and 5 columns are arranged in a matrix of 5 rows and 5 columns. The optical axis B1 of the first unit lens 11 may also be parallel to the optical axis B2 of the optical lens 30, but it is preferred that the optical axis B1 of at least one first unit lens 11 is inclined relative to the optical axis B2 of the optical lens 30. In this embodiment, as Figure 1 and Figure 4A As shown, the other unit first lenses 11 except the unit first lens (central unit first lens) 20 configured corresponding to the central unit light focusing portion 80 are respectively configured so that the optical axis B1 is inclined relative 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 the central unit first lens 20 relative to the optical axis B2 of the optical lens 30 can be set to different values ​​according to each unit first lens 11 mainly based on the inclination angle of the central axis C1 of the corresponding unit light focusing portion 75, and the configuration 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.

[0139] As described above, in the present embodiment, the 25 light emitting sections 41 and the irradiation regions corresponding to the respective light emitting sections 41 have a point-symmetrical arrangement relationship with respect to the point O above the central light emitting section 50 .

[0140] therefore,

[0141] (1) The optical axis B1 of the first unit lens 11 arranged in the third row and the second column and the optical axis B1 of the first unit lens 11 arranged in the third row and the fourth column are inclined at the same angle (first angle) with respect to the optical axis B2 of the optical lens 30;

[0142] (2) the optical axis B1 of the first unit lens 11 arranged in the second row and third column and the optical axis B1 of the first unit 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;

[0143] (3) the optical axis B1 of the first unit lens 11 arranged in the second row and second column, the optical axis B1 of the first unit lens 11 arranged in the second row and fourth column, the optical axis B1 of the first unit lens 11 arranged in the fourth row and second column, and the optical axis B1 of the first unit 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;

[0144] (4) the optical axis B1 of the first unit lens 11 arranged in the third row and the first column and the optical axis B1 of the first unit lens 11 arranged in the third row and the fifth column are inclined at the same angle (fourth angle) with respect to the optical axis B2 of the optical lens 30;

[0145] (5) The optical axis B1 of the first unit lens 11 arranged in the first row and the third column and the optical axis B1 of the first unit lens 11 arranged in the fifth row and the third column are inclined at the same angle (fifth angle) with respect to the optical axis B2 of the optical lens 30;

[0146] (6) the optical axis B1 of the first unit lens 11 arranged in the second row and the first column, the optical axis B1 of the first unit lens 11 arranged in the second row and the fifth column, the optical axis B1 of the first unit lens 11 arranged in the fourth row and the first column, and the optical axis B1 of the first unit lens 11 arranged in the fourth row and the fifth column are inclined at the same angle (sixth angle) with respect to the optical axis B2 of the optical lens 30;

[0147] (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 inclined at the same angle (seventh angle) with respect to the optical axis B2 of the optical lens 30;

[0148] (8) The optical axis B1 of the unit first lens 11 arranged in the 1st row and 1st column, the optical axis B1 of the unit first lens 11 arranged in the 1st row and 5th column, the optical axis B1 of the unit first lens 11 arranged in the 5th row and 1st column, and the optical axis B1 of the unit first lens 11 arranged in the 5th row and 5th column are respectively inclined at the same angle (the eighth angle) relative to the optical axis B2 of the optical lens 30.

[0149] Furthermore, when the top view shape of the light emitting portion 41 is a square and the light emitting surfaces 41a of the light emitting portions 41 have the same size,

[0150] (a) the first angle and the second angle are the same angle;

[0151] (b) the fourth angle and the fifth angle are the same angle;

[0152] (c) The sixth angle and the seventh angle are the same angle:

[0153] (d) the third angle is set larger than the first angle and the second angle;

[0154] (e) the fourth angle and the fifth angle are set larger than the first angle and the second angle;

[0155] (f) the sixth angle and the seventh angle are set larger than the fourth angle and the fifth angle;

[0156] (g) The eighth angle is set larger than the sixth angle and the seventh angle.

[0157] In addition, it should be noted that the angle at which the optical axis B1 of the unit first lens 11 is tilted relative to the optical axis B2 of the optical lens 30 is set according to the tilt angle of the central axis C1 of the corresponding unit light focusing portion 75 .

[0158] For example, the optical axis B1 of the first lens unit 11 is inclined at an angle γ2 (see Figure 4C ) may also be the same as the angle γ1 at which the central axis C1 of the unit focusing portion 75 is inclined relative to the optical axis B2 of the optical lens 30. When the angle γ1 is the same as the angle γ2 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, the shortest distance x and the angle α used in the above-mentioned formula 1.

[0159] [Mathematical formula 2]

[0160]

[0161] (Optical lens)

[0162] like Figure 4AAs shown, the optical lens 30 is arranged above the light-emitting portion 41, and covers 25 light-emitting portions 41, the focusing portion 70 and the first lens 10 together. The optical lens 30 of 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 arranged in sequence from the first lens 10 side. The first optical lens 36, the second optical lens 37 and the third optical lens 38 are arranged with spaces between the lenses. 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 respectively arranging their ends on a supporting portion 5 provided on the inner side surface of the housing 3. In addition, in the accompanying drawings, the supporting portion supporting the second optical lens 37 and the supporting 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 the optical axes thereof coincide with each other. Therefore, the optical axis B2 of the optical lens 30 is determined as one axis. In this embodiment, the optical lens 30 is arranged so that the optical axis B2 is orthogonal 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 defining the point-symmetric arrangement relationship between the light emitting portion 41 and the corresponding irradiation area is arranged on the optical axis B2 of the optical lens 30.

[0163] In addition, the supporting method of the first optical lens 36, the second optical lens 37 and the third optical lens 38 is not limited to the method of providing the supporting portion 5 on the inner side surface of the housing 3. For example, the first optical lens 36, the second optical lens 37 and the third optical lens 38 may also be mounted and supported on a supporting rod provided on the inner upper surface of the housing 3.

[0164] The optical lens 30 includes: a first surface 31 located on the light emitting surface 41a side of the light emitting portion 41; and a second surface 32 located on the opposite side of the first surface 31, that is, on the side of the opening portion 4 of the housing 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 the present embodiment, the surface of the first optical lens 36 on the light emitting portion 41 side is the first surface 31, and the surface of the third optical lens 38 on the side of the opening portion 4 of the housing 3 is the second surface 32.

[0165] The first surface 31 includes a plurality of incident regions 33 corresponding to the light emitting sections 41 , respectively, into which the light emitted from the light emitting sections 41 enters. The second surface 32 includes a plurality of emission regions 34 corresponding to the plurality of incident regions 33 , respectively.

[0166] As described above, in order to determine the light distribution characteristics of the light emitted from each light emitting portion 41, the shapes of the first surface 31 including the incident area 33 and the second surface 32 including the exit area 34 of the optical lens 30 are set. In the present embodiment, 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, which are isolated and arranged with air between them. Therefore, the shape of the area (exit area) where the light is emitted from the first optical lens 36, the difference between the refractive index of the first optical lens 36 and the refractive index of the air, the shape of the area (incident area) where the light is incident on the second optical lens 37, the shape of the area (exit area) where the light is emitted from the second optical lens 37, the difference between the refractive index of the second optical lens 37 and the refractive index of the air, the shape of the area (incident area) where the light is incident on the third optical lens 38, and the difference between the refractive index of the first optical lens 38 and the refractive index of the air have an influence on the light distribution characteristics of the light between the incident area 33 and the exit area 34. Therefore, the shapes of the incident region 33 and the emission region 34 are designed in consideration of these factors.

[0167] Depending on the size of the half-value full angle 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 relative to the optical axis B2 of the optical lens 30, etc., the light emitted from the adjacent light-emitting portions 41 respectively incident on each incident area 33 of the optical lens 30 can overlap in part or in whole. Therefore, two adjacent incident areas 33 of the multiple incident areas 33 of the optical lens 30 can overlap in part or in whole. In the present specification, the area of ​​each incident area 33 where only the light emitted from the corresponding unit first lens 11 is incident is referred to as the first incident area 33c, and the area of ​​each incident area 33 that overlaps with the adjacent incident area 33 is referred to as the second incident area 33d. Figure 4C The first incident area 33c and the second incident area 33d are shown in FIG. Therefore, each incident area 33 of the optical lens 30 can include: a first incident area 33c into which light emitted from the light emitting portion 41 corresponding to the incident area 33 is incident; and a second incident area 33d into which light emitted from a light emitting portion 41 adjacent to the light emitting portion 41 is incident in addition to the light. Therefore, each incident area 33 is not limited to being designed independently, and can be appropriately designed in association with adjacent incident areas.

[0168] Similarly, depending on the position of the corresponding incident area 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 configuration of the corresponding irradiation area, etc., the light incident from adjacent incident areas 33 to the optical lens 30 and emitted from the optical lens 30 may partially or completely overlap. Therefore, two adjacent exit areas 34 of the multiple exit areas 34 of the optical lens 30 may partially or completely overlap. In the present specification, the area in each exit area 34 from which only the light emitted from the corresponding unit first lens 11 is emitted is referred to as the first exit area 34c, and the area in each exit area 34 that overlaps with the adjacent exit area 34 is referred to as the second exit area 34d. Figure 4A The first exit area 34c and the second exit area 34d are shown in FIG. Therefore, each exit area 34 of the optical lens 30 can include: a first exit area 34c from which light incident on the optical lens 30 via the incident area 33 corresponding to the exit area 34 is emitted; and a second exit area 34d from which light incident on the optical lens 30 from an incident area 33 adjacent to the incident area 33 in addition to the light is emitted. Therefore, each exit area 34 is not limited to being designed independently, and can be appropriately designed in association with adjacent exit areas 34.

[0169] in addition, Figure 4C The shortest distance d0 between the first surface 31 of the optical lens 30 and the first lens 10 shown is, for example, greater than 0.1 mm and less than 1.0 mm, preferably, for example, greater than 0.1 mm and less than 0.5 mm. The shortest distance d0 of this embodiment refers to the closest distance to each other regardless of the shape of the first surface 31 of the optical lens 30 and the shape of the first lens 10. By making 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.

[0170] Next, refer to Figures 6A to 7B , the light distribution of light emitted from each light emitting unit 41 will be described in detail.

[0171] (Light Distribution from the Central Light Emitting Unit 50)

[0172] like Fig. 6A and Figure 6B As shown, the light emitted from the light emitting surface 50a of the central light emitting portion 50 is mainly,

[0173] (1) From the light incident portion 81 of the central unit light focusing portion 80, light having a first light quantity (amount of light per unit area) φ1 enters the central unit light focusing portion 80 (see Fig. 6A ),

[0174] (2) Total reflection is performed on the inner side surface 83 of the central unit light focusing portion 80, thereby increasing the amount of light per unit area.

[0175] (3) The light emitting portion 82 of the central unit light focusing portion 80 emits light having a second light quantity (light quantity per unit area) φ2 and a first half-value full angle θ1 to the outside of the central unit light focusing portion 80.

[0176] (4) The light is incident on the central first lens 20 from the inner surface 23a of the concave portion 23 of the central unit first lens 20,

[0177] (5) Total reflection is performed on the inner side surface 24 of the first lens 20 of the central unit, so that the half-value full angle is narrowed.

[0178] (6) emitted from the upper surface 21 of the first lens 20 of the central unit at a second half-value full angle θ2,

[0179] (7) The incident light is incident on the optical lens 30 from the incident area 33a corresponding to the central light emitting portion 50 (see Figure 6B ),

[0180] (8) is emitted from the emission region 34a corresponding to the incident region 33a to the outside of the optical lens 30,

[0181] (9) The irradiation area R33 corresponding to the central light-emitting portion 50 (the irradiation area located directly above the central light-emitting portion 50) is irradiated.

[0182] In order to illuminate the irradiation area R33 disposed directly above the central light emitting portion 50, the central axis C1 of the central unit light focusing portion 80 is disposed to be orthogonal to the light emitting surface 50a of the central light emitting portion 50, and the central unit first lens 20 is disposed so that the optical axis B1 is orthogonal to the light emitting portion 82 of the central unit light focusing portion 80. That is, the central axis C1 of the central unit light focusing portion 80 and the optical axis B1 of the central unit first lens 20 are disposed on the optical axis B2 of the optical lens 30.

[0183] The shape of the incident area 33a of the optical lens 30 corresponding to the central light-emitting portion 50 (the incident area of ​​the first optical lens 36) and the shape of the exit area 34a of the optical lens 30 corresponding to the incident area 33a (the exit area of ​​the third optical lens 38) are appropriately designed so that the light emitted from the first lens 20 of the central unit illuminates the irradiation area R33 arranged directly above the central light-emitting portion 50.

[0184] Similarly, the shape of the exit area of ​​the first optical lens 36 corresponding to the central light-emitting portion 50, the shape of the incident area and the shape of the exit area of ​​the second optical lens 37, and the shape of the incident area of ​​the third optical lens 38 are appropriately designed so that the light emitted from the first lens 20 of the central unit illuminates the irradiation area R33 arranged directly above the central light-emitting portion 50.

[0185] (Light Distribution from Light Emitting Parts Other Than the Central Light Emitting Part 50)

[0186] The light 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 the optical axis B2 of the optical lens 30 and illuminates the corresponding irradiation area.

[0187] Therefore, the light emitting unit (peripheral light emitting unit) 55 (see Figure 2A ) as an example, the light distribution of light emitted from light-emitting portions other than the central light-emitting portion 50 is described.

[0188] like Fig. 7A As shown, the light emitted from the light emitting surface 55a of the peripheral light emitting unit 55 is mainly,

[0189] (1) Light having a first light quantity (amount of light per unit area) φ1 enters the surrounding unit light collecting section 85 from the light incident section 86 of the surrounding unit light collecting section 85 (see Fig. 7A ),

[0190] (2) Total reflection is performed on the inner side surface 88 of the surrounding unit light focusing portion 85, thereby increasing the amount of light per unit area.

[0191] (3) The light emitting portion 87 of the surrounding unit light focusing portion 85 emits light having a second light quantity (light quantity per unit area) φ2 and a first half-value full angle θ1 to the outside of the surrounding unit light focusing portion 85.

[0192] (4) The light is incident on the surrounding unit first lens 25 from the inner surface 28a of the concave portion 28 of the unit first lens (surrounding unit first lens) 25 arranged to cover the light exit portion 87 of the surrounding unit light focusing portion 85,

[0193] (5) Total reflection is performed on the inner side surface 29 of the first lens 25 of the peripheral unit, so that the full angle at half maximum is narrowed.

[0194] (6) emitted from the upper surface 26 of the first lens 25 of the peripheral unit at a second half-value full angle θ2,

[0195] (7) The incident light is incident on the optical lens 30 from the incident area 33b corresponding to the peripheral light emitting portion 55 (see Figure 7B ),

[0196] (8) intersecting the optical axis B2 of the optical lens 30 in the optical lens 30,

[0197] (9) is emitted from the emission region 34b corresponding to the incident region 33b to the outside of the optical lens 30,

[0198] (10) Irradiate the irradiation area R35 corresponding to the peripheral light emitting portion 55.

[0199] In addition, the position where the light emitted from the peripheral light emitting portion 55 intersects with the optical axis B2 of the optical lens 30 is not limited to within the optical lens 30, and can be any position from the light emitted from the peripheral light emitting portion 55 to irradiating the corresponding irradiation area R35.

[0200] As described above, in the present embodiment, the 25 light-emitting units 41 and the irradiation areas corresponding to the respective light-emitting units 41 have a point-symmetrical configuration relationship with respect to a point O above the central light-emitting unit 50. Therefore, the surrounding unit light-concentrating unit 85 is configured such 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 configured such that its optical axis B1 intersects with the optical axis B2 of the optical lens 30 above the central light-emitting unit 50. Thus, compared with a case where the surrounding unit light-concentrating unit 85 and the surrounding unit lens 25 are not provided, the light emitted from the light-emitting unit 41 has a higher directivity toward the corresponding irradiation area R35.

[0201] In addition, the central axis C1 of the surrounding unit light collecting portion 85 and the optical axis B1 of the surrounding unit first lens 25 may be parallel.

[0202] The shape of the incident area 33b of the optical lens 30 (the incident area of ​​the first optical lens 36) corresponding to the surrounding light-emitting portion 55 and the shape of the exit area 34b of the optical lens 30 (the exit area of ​​the third optical lens 38) are appropriately designed so that the light emitted from the first lens 25 of the surrounding unit illuminates the irradiation area R35 which is arranged at a position that is point-symmetrical with respect to the surrounding light-emitting portion 55 relative to a point O.

[0203] Similarly, the shape of the exit area of ​​the first optical lens 36, the shape of the incident area and the shape of the exit area of ​​the second optical lens 37, and the shape of the incident area of ​​the third optical lens 38 are appropriately designed so that the light emitted from the first lens of the surrounding unit illuminates the irradiation area at a position that is point-symmetrical with respect to the surrounding light-emitting portion relative to a point O.

[0204] As described above, the light source 1 of the present embodiment includes: the light focusing portion 70 arranged to cover the light emitting surface 41a of the light emitting portion 41, and the first lens 10 arranged to cover the light emitting portion 72 of the light focusing portion 70. The light emitted from the light emitting surface 41a of the light emitting portion 41 passes through the light focusing portion 70 to increase the light quantity per unit area, and the full angle at half maximum is narrowed by the first lens 10. After having high directivity toward the corresponding irradiation area, it enters the optical lens 30. As a result, the light emitted from the light emitting surface 41a of the light emitting portion 41 can irradiate the corresponding desired irradiation area with sufficient light quantity and brightness.

[0205] 2. Implementation Method 2

[0206] Figure 8 The light source 201 according to the second embodiment shown is different from the light source 1 according to the first embodiment in that the outer side surface 79 of the unit light focusing portion 75 is covered with a second light reflecting member 295 .

[0207] The second light reflecting member 295 is a white covering member formed of a white resin containing a light diffusing material such as titanium oxide, for example.

[0208] In this way, the outer side surface 79 of the unit focusing portion 75 is covered by the second light reflective component 295, so that the light entering the unit focusing portion 75 is easily totally reflected at the inner side surface 78 of the unit focusing portion 75, and the amount of light per unit area can be more efficiently increased through the focusing portion 270.

[0209] 3. Implementation Method 3

[0210] Fig. 9 The light source 301 of the embodiment 3 shown is different from the light source 1 of the embodiment 1 in the following aspects: the focusing portion 370 is composed of a third light reflective component 395 having a first opening portion on the light-emitting portion side, a second opening portion on the optical lens side, and a plurality of cavity portions 375 respectively arranged corresponding to the plurality of light-emitting portions.

[0211] In the present embodiment, light entering from the first opening 376 of the cavity 375 with a first light quantity (amount of light per unit area) φ1 is totally reflected in the cavity 375, and exits from the second opening 377 with a second light quantity (amount of light per unit area) φ2 greater than the first light quantity φ1 to the outside of the cavity 375. Therefore, in the present embodiment, the cavity 375 is a unit light focusing portion, the first opening 376 is a light entering portion, and the second opening 377 is a light exiting portion.

[0212] Hereinafter, the light focusing unit 370 will be described in detail.

[0213] The light focusing 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 a substantially rectangular shape. The light focusing portion 370 is arranged over 25 light emitting portions 41. The light focusing portion 370 is formed by, for example, providing a plurality of hollow portions 375 in a third light reflective member 395 formed of a white resin including a light diffusing material such as titanium oxide.

[0214] The cavity 375 is a through hole having a second opening 377 on the upper surface 370a of the light focusing portion 370 and a first opening 376 on the lower surface 370b of the light focusing portion 370. The cavity 375 is provided corresponding to each light emitting portion 41. Therefore, the light focusing portion 370 includes 25 cavity portions 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 becomes tapered from the first opening 376 toward 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 quadrilateral, or other polygons.

[0215] Here, the opening refers to the opening of the cavity 375 formed on the surface (upper surface 370a or lower surface 370b). The area of ​​the opening refers to the area of ​​the region surrounded by the contour of the opening. The shape of the opening refers to the shape of the region surrounded by the contour of the opening.

[0216] The shape and size of the first opening 376 are determined so that, when the perspective light source 301 is viewed from above, the contour of the first opening 376 is located outside the periphery of the light emitting surface 41a of the light emitting unit 41. Thus, light emitted from the light emitting surface 41a of the light emitting unit 41 can be efficiently incident on the cavity 375.

[0217] In this embodiment, the cavity 375 is a space filled with air, but may be filled with other substances. In this case, the other substance is, for example, polycarbonate or silicone resin, preferably a substance having a refractive index close to that of air.

[0218] 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 also be arranged to be inclined relative to the optical axis B2 of the optical lens 30, based on the arrangement 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 relative to the optical axis B2 of the optical lens 30 is a parameter to be considered in order to set the shape of the incident area 33 and the shape of the emission area 34 of the optical lens 30.

[0219] By making the focusing portion 370 consist of a third light reflecting component 395 having a plurality of hollow portions 375 having a first opening portion 376 on the light emitting portion 41 side and a second opening portion 377 on the optical lens 30 side, it is possible to reduce light absorption in the unit focusing portion (hollow portion 375) compared to the unit focusing portion 75 serving as a lens as described above, thereby suppressing light loss.

[0220] Modifications

[0221] 1. Modification 1

[0222] Fig.10 The light source 401 of the modification example 1 shown is different from the light source of the embodiment in the following aspects: the unit first lens is a truncated cone-shaped lens in which the area of ​​the upper surface 411a is larger than the area of ​​the lower surface 411b. The shapes of the upper surface 411a and the lower surface 411b of the unit first lens 411 of the modification example 1 can be, for example, circular, triangular, quadrilateral, etc. The unit first lens 411 is configured to cover the light exit portion 72 of the unit light focusing portion 75 with the lower surface 411b. The unit first lens 411 is not limited to a truncated cone-shaped lens in which the area of ​​the upper surface 411a is larger than the area of ​​the lower surface 411b, and can also be a truncated cone-shaped lens in which the area of ​​the upper surface 411a is smaller than the area of ​​the lower surface 411b, or can be a cylindrical lens in which the area of ​​the upper surface 411a is equal to the area of ​​the lower surface 411b. Such a unit first lens 411 can also adjust the directivity of light by using the reflection inside the unit first lens 411, similar to the internal total reflection lens described above.

[0223] In addition, since the shape of the unit first lens 411 is simple, it is easy to form a mold for forming the unit first lens 411.

[0224] 2. Modification 2

[0225] This modification and modifications 3 to 5 described later are different from the light source of the embodiment in the following respects: the first lens is a lens that covers the light emitting portion 72 of a plurality of unit light focusing portions 75 collectively and has at least one convex surface (convex surface) on the optical lens 30 side.

[0226] exist Fig.11 In the light source 501 of the variation example 2 shown, the unit first lens is a lens having a convex surface (convex surface) on the optical lens 30 side. Regarding the unit first lens 511 of the variation example 2, for example, the cross-sectional shape is a semicircular shape, and the convex surface 511a is formed by a smooth curved surface. Moreover, the unit first lenses 511 are connected to each other on the lower surface side and integrated. Therefore, the first lens 510 includes a plurality of unit first lenses 511, and the plurality of unit first lenses 511 collectively cover the light emitting portions 72 of the plurality of unit focusing portions 75, are respectively arranged corresponding to the light emitting portions 72, and have a convex surface (convex surface) 511a on the optical lens 30 side.

[0227] The shape of the unit first lens 511 of such a first lens 510 is simple, so it is easy to form a mold for forming the first lens 510. In addition, in such a light source 501, a plurality of unit first lenses 511 are integrated to form a first lens 510, so there is no need to configure each unit first lens separately. That is, for example, the first lens 510 is configured so that the optical axis B5 of the center unit first lens located at the center of the first lens 510 is consistent with the optical axis B2 of the optical lens 30 or the center axis C1 of the center unit focusing portion 80, thereby all the unit first lenses 511 can be configured on the focusing portion 70. In this way, the manufacturing process can be simplified.

[0228] However, the first unit lens 511 having a semicircular cross-sectional shape and having a convex surface 511 a which is a smooth curved surface on the optical lens 30 side is not limited to being an integrated single lens, but may be separate components.

[0229] 3. Modification 3

[0230] The first lens 610 of the light source 601 of the modification example 3 has a convex surface (convex surface) 610a on the optical lens 30 side. Fig.12 As shown, the contour shape of the convex surface 610 a in the cross section of the first lens 610 is arc-shaped, and the convex surface 610 a is formed by a smooth curved surface.

[0231] Such a first lens 610 has a simple shape, so it is easy to form a mold for forming the first lens 610. In addition, when such a first lens 610 is arranged on a plurality of unit light focusing portions 75, for example, it is sufficient to arrange the optical axis B6 of the first lens 610 on the optical axis B2 of the optical lens 30 or the central axis C1 of the central unit light focusing portion 80. Thus, the manufacturing process can be simplified.

[0232] In addition, the curvature of the convex surface 610a of the first lens 610 may be the same in the range from the optical axis B6 to the end of the first lens 610, or may be different according to the distance from the optical axis B6. In particular, by increasing the curvature of the convex surface 610a of the first lens 610 as it moves from the optical axis B6 toward the end of the first lens 610, the following effects are expected.

[0233] First, 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 portion 41), especially light that is directed toward the housing 3, among the light emitted from the light-emitting portion 41 arranged near the end of the convex surface 610a of the first lens 610 (for example, in this embodiment, the light-emitting portion 41 arranged at the 1st row, kth column, the 5th row, kth column, and the kth row, 5th column (k=1 to 5)), is not easily incident on the optical lens 30. Therefore, the loss of light from the light-emitting portion 41 increases. 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 portion of the convex surface 610a, the light that is directed toward the housing 3, among the light emitted from the light-emitting portion 41 arranged near the end of the convex surface 410a, can be refracted toward the direction in which directivity is desired, and the loss of light from the light-emitting portion 41 can be suppressed.

[0234] 4. Modification 4

[0235] The first lens 710 of the light source 701 of the modification example 4 has a convex surface (convex surface) 710a on the optical lens 30 side. Fig.13 As shown, the convex surface 710 a of the first lens 710 includes a plane 710 b located at the center of the convex surface 710 a and a curved surface 710 c connecting the plane 710 b and the lower surface 710 d of the first lens 710 and located at the end of the first lens 710 .

[0236] The plane 710b is orthogonal 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 arranged to collectively cover the light emitting portions 72 of all the unit light focusing portions 75 with the lower surface 710d.

[0237] As described for the light source 601 of modification example 3, in the light source 701 of this modification example, by increasing the curvature of the curved surface 710c of the first lens 710 on the end side of the first lens 710, it is possible to refract light emitted from the light-emitting portion 41 disposed near the end of the first lens 710 in a desired direction (in this modification example, the direction of the irradiation area corresponding to the light-emitting portion 41). Therefore, the loss of light from the light-emitting portion 41 can be suppressed. Furthermore, by making the central portion of the convex surface 710a of the first lens 710 a plane, the lens thickness can be made thinner compared to the first lens having a convex curved surface as a whole on the optical lens 30 side like the light source 601 of modification example 3, so that the light source can be miniaturized.

[0238] Since the shape of the first lens 710 is simple, it is easy to form a mold for forming the first lens 710. In addition, when the first lens 710 is arranged on a plurality of unit light focusing portions 75, for example, the optical axis B7 of the first lens 710 can be arranged on the optical axis B2 of the optical lens 30 or the central axis C1 of the central unit light focusing portion 80. Thus, the manufacturing process can be simplified.

[0239] 5. Modification 5

[0240] The first lens 810 of the light source 801 of Modification 5 has a single convex surface (convex surface) 810 a on the optical lens 30 side.

[0241] The convex surface 810a is formed so that its cross-sectional shape is like Fig.14 As shown in the figure, the convex surface 810a is configured to be a smoothly curved surface in an annular shape with the optical axis B8 of the first lens 810 as the center. Therefore, in the cross-sectional shape passing through the optical axis B8 of the first lens 810, the convex surface 810a has two tops 810d. The top 810d of the convex surface 810a is preferably configured at a position where the distance d1 from the top 810d of the convex surface 810a to the optical axis B8 of the first lens 810 is shorter than the distance d2 from the top 810d of the convex surface 810a to the outer peripheral end 810f of the first lens 810.

[0242] The first lens 810 has a central portion formed with a concave surface 810c continuous with the convex surface 810a, and a top 810e of the concave surface 810c is disposed on the optical axis B8 of the first lens 810. The optical axis B8 of the first lens 810 is arranged to coincide with the optical axis B2 of the optical lens 30.

[0243] It is preferable that the end of the first lens 810 (in the present embodiment, the end of the convex surface 810 a and the vicinity of the outer peripheral end 810 f ) has a curvature greater than the curvature of the concave surface 810 c .

[0244] In addition, the first lens 810 is configured to cover the light emitting portions 72 of all the unit light focusing portions 75 at once using the lower surface 810b. When the first lens 810 is configured on a plurality of unit light focusing portions 75, for example, the optical axis B8 of the first lens 810 only needs to be configured on the optical axis B2 of the optical lens 30 or the central axis C1 of the central unit light focusing portion 80. Thus, the manufacturing process can be simplified.

[0245] 6. Modification 6

[0246] The light source of the modification example 6 is different from the light source of the embodiment in the following aspects: Fig.15As shown, the unit first lenses other than the central unit first lens are internal total reflection lenses of a rotationally asymmetric shape centered on the optical axis. The unit first lenses 911 other than the central unit first lens of Modification Example 6 are internal total reflection lenses of a rotationally asymmetric shape centered on the optical axis B9, and are formed such that a connection portion 916 (open end portion of the recess 914) between the lower surface 913 and the inner surface 914a of the recess 914 provided on the lower surface 913 is in contact with the light exit portion 72. That is, the light exit portion 72 of the unit light focusing portion 75 is covered by the internal total reflection lens, i.e., the inner surface 914a of the recess 914 provided on the light exit portion 72 side of the unit light focusing portion 75 of the unit first lens 911. By using such a unit first lens 911, the light emitted from the light exit portion 72 will not leak out from between the unit light focusing portion 75 and the unit first lens 911, but enters the unit first lens 911 via the inner surface 914a of the recess 914 of the unit first lens 911. This can improve the utilization efficiency of the light emitted from the light emitting section 41 .

[0247] Depending on which row and column of the 5-row 5-column matrix the light emitting portion is arranged in, the inclination angle of the unit first lens 911 relative to the optical axis B2 of the optical lens 30 is different, so the shape of the unit first lens 911 is different according to each light emitting portion 41.

[0248] However, in the present embodiment, the 25 light emitting sections 41 and the irradiation regions corresponding to the respective light emitting sections 41 have a point-symmetrical arrangement relationship with respect to a point O above the central light emitting section 50 .

[0249] therefore,

[0250] (1) The unit first lens 911 arranged in the third row and the second column has the same shape as the unit first lens 911 arranged in the third row and the fourth column (shape 1);

[0251] (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);

[0252] (3-1) The unit first lens 911 arranged at the 2nd row and the 2nd column and the unit first lens 911 arranged at the 4th row and the 4th column have the same shape (shape 3-1);

[0253] (3-2) The unit first lens 911 arranged at the second row and the fourth column has the same shape as the unit first lens 911 arranged at the fourth row and the second column (shape 3-2);

[0254] (4) The optical axis of the unit first lens 911 arranged in the third row and the first column is the same shape as the optical axis of the unit first lens 911 arranged in the third row and the fifth column (shape 4);

[0255] (5) The optical axes of the unit first lens 911 arranged in the 1st row and the 3rd column and the unit first lens 911 arranged in the 5th row and the 3rd column have the same shape (shape 5);

[0256] (6-1) The unit first lens 911 arranged at the second row and the first column and the unit first lens 911 arranged at the fourth row and the fifth column have the same shape (shape 6-1);

[0257] (6-2) The unit first lens 911 arranged at the 2nd row and the 5th column has the same shape as the unit first lens 911 arranged at the 4th row and the 1st column (shape 6-2);

[0258] (7-1) The unit first lens 911 arranged at the 1st row and the 2nd column and the unit first lens 911 arranged at the 5th row and the 4th column have the same shape (shape 7-1);

[0259] (7-2) The unit first lens 911 arranged in the 1st row and the 4th column and the unit first lens 911 arranged in the 5th row and the 2nd column have the same shape (shape 7-2);

[0260] (8-1) The unit first lens 911 arranged in the 1st row and the 1st column and the unit first lens 911 arranged in the 5th row and the 5th column have the same shape (shape 8-1);

[0261] (8-2) The unit first lens 911 arranged at the 1st row and the 5th column has the same shape as the unit first lens 911 arranged at the 5th row and the 1st column (shape 8-2).

[0262] Furthermore, when the top view shape of the light-emitting portion 41 is a square and the size of the light-emitting surface 41a of each light-emitting portion 41 is the same, shape 1 is the same shape as shape 2, shape 4 is the same shape as shape 5, shape 6-1, shape 6-2, shape 7-1 and shape 7-2 are the same shape, shape 3-1 is the same shape as shape 3-2, and shape 8-1 is the same shape as shape 8-2.

[0263] 7. Modification 7

[0264] Fig.16 The light source 1001 of the modification 7 shown is different from the light source of the embodiment in the following respects: the wavelength conversion member provided with the light emitting section is configured to cover the upper surface of the light emitting element 42 and the upper surface of the light reflecting member 46. The wavelength conversion member 1045 of the modification 7 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 reflecting member 46 of all 25 light emitting sections 41.

[0265] In addition, since the wavelength conversion component 1045 is a thinner component, when the wavelength conversion component 1045 is configured to cover the upper surface of the light emitting element 42 and the upper surface of the light reflective component 46, the light emitting surface 1041a of the light emitting portion 1041 can be regarded as the area of ​​the wavelength conversion component 1045 that is located directly above the upper surface of the light emitting element 42.

[0266] Other Modifications

[0267] In the light sources of the above-mentioned embodiments and modified examples, the optical lens 30 is composed of three lenses, namely, a first optical lens 36, a second optical lens 37 and a third optical lens 38, but the number of lenses constituting the optical lens is not limited thereto. Fig.17 As shown, the optical lens 1130 is composed of one lens. Fig.18 As shown, the optical lens 1230 is composed of two lenses, namely, a first optical lens 1236 and a second optical lens 1237. In addition, for example, the optical lens may be composed of four or more lenses.

[0268] The light source of the above-mentioned embodiment and modified example supports the optical lens by the support portion 5 provided on the inner surface of the housing 3, but the method of supporting the optical lens is not limited thereto. Fig.19 As shown, each optical lens 36 , 37 , 38 is supported by a first leg 6A, a second leg 6B, and a third leg 6C connected to the respective ends of the first optical lens 36 , the second optical lens 37 , and the third optical lens 38 .

[0269] The first leg portion 6A extends from the 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 portion 6B extends from the end of the second optical lens 37 to the upper surface of the first leg portion 6A to support the second optical lens 37. The third leg portion 6C extends from the end of the third optical lens 38 to the upper surface of the second leg portion 6B to support the third optical lens 38.

[0270] The first leg 6A, the second leg 6B, and the third leg 6C may be formed of, for example, a light reflective member or a light shielding member. The first leg 6A, the second leg 6B, and the third leg 6C may be, for example, a part of a lens formed of the same material as the first optical lens 36, the second optical lens 37, and the third optical lens 38. In this case, the bonding member 7 that bonds the first leg 6A, the second leg 6B, and the third leg 6C to each other may be, for example, an adhesive or the like.

[0271] In addition, the first leg portion 6A, the second leg portion 6B, and the third leg portion 6C may be an integrated one component.

[0272] In addition, when each optical lens is supported by a leg portion connected to the end portion of each optical lens in this way, the light source does not need to include a housing.

[0273] The embodiments, variations and examples of the present disclosure are described above, but the content of the invention may vary in structural details, and combinations of elements in the embodiments, variations and examples, changes in order, etc. may be implemented without departing from the required scope and idea of ​​the present disclosure.

[0274] The light source device of the present disclosure can irradiate light to a desired irradiation area, and therefore can be applied to lighting, camera flashes, vehicle headlights, etc. However, the light source device of the present disclosure is not limited to these applications.

Claims

1. A light source device for irradiating light to two or more irradiation areas, wherein: The light source device comprises: A plurality of light-emitting parts having a light-emitting surface on the upper surface; an optical lens, located above the light-emitting surface of the light-emitting portion, and comprising a first surface and a second surface, wherein the first surface includes a plurality of incident areas and is located on the light-emitting surface side of the light-emitting portion, the plurality of incident areas respectively corresponding to the plurality of light-emitting portions, and light emitted from the light-emitting portion is incident on the incident areas, and the second surface includes a plurality of emission areas respectively corresponding to the plurality of incident areas and is located on the opposite side of the first surface; as well as The focusing portion is located between the light-emitting portion and the optical lens, and comprises a plurality of light input portions and a plurality of light output portions. The plurality of light input portions are respectively arranged corresponding to the plurality of light-emitting portions, the light input portions cover the light-emitting surfaces of the light-emitting portions, the plurality of light output portions are respectively arranged corresponding to the plurality of light input portions, and the light output portions have an area smaller than that of the light input portions.

2. A light source device for irradiating light to two or more irradiation areas, wherein: The light source device comprises: A plurality of light-emitting parts having a light-emitting surface on the upper surface; an optical lens, located above the light-emitting surface of the light-emitting portion, and having a first surface including a first incident area and a second surface including a first emission area; as well as The focusing portion is located between the light-emitting portion and the optical lens, and comprises a plurality of light input portions and a plurality of light output portions. The plurality of light input portions are respectively arranged corresponding to the plurality of light-emitting portions, the light input portions cover the light-emitting surfaces of the light-emitting portions, the plurality of light output portions are respectively arranged corresponding to the plurality of light input portions, and the light output portions have an area smaller than that of the light input portions.

3. The light source device according to claim 1 or 2, wherein: At least one axis connecting the center of the light incident portion provided corresponding to the light emitting portion and the center of the light emitting portion corresponding to the light incident portion is inclined at an angle γ1 with respect to the optical axis of the optical lens.

4. The light source device according to claim 3, wherein: The plurality of light emitting parts are arranged in a matrix. The angle γ1 is expressed using the shortest distance L, the shortest distance x and the angle α as The shortest distance L is the shortest distance from the optical axis of the optical lens to the center of the light-emitting surface of the light-emitting portion arranged at the corner of the matrix, where 0<L, The shortest distance x is the shortest distance from the optical axis of the optical lens to the center of the light-emitting surface of the light-emitting portion provided corresponding to the light-entering portion having the axis provided in the inclined manner, wherein 0<x≤L, The angle α is the angle formed by a straight line connecting the center point with one of the two points located at the diagonal angle of an area including the entire irradiation area, and a straight line connecting the center point with the other of the two points, when the intersection of the plane extending from the light-emitting surfaces of the multiple light-emitting parts and the optical axis of the optical lens is taken as the center point, wherein 0°<α<180°.

5. The light source device according to any one of claims 1 to 4, wherein: The light focusing unit includes a plurality of truncated cone lenses covering the light emitting surfaces of the plurality of light emitting units. The light incident portion is the lower surface of the frustum-shaped lens, The light exit portion is the 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.

7. The light source device according to claim 5 or 6, wherein: The outer side surfaces of the plurality of truncated cone-shaped lenses are covered with a light reflective member.

8. The light source device according to any one of claims 1 to 4, wherein: The light focusing portion includes a plurality of hollow portions, each of which has a first opening portion on the light emitting portion side and a second opening portion on the optical lens side, and each of the plurality of hollow portions is arranged corresponding to the plurality of light emitting portions. The light incident portion is the first opening of the cavity portion, The light exit portion is the second opening of the cavity portion.

9. The light source device according to any one of claims 1 to 8, wherein: The light source device includes a first lens covering the plurality of light emitting portions of the light focusing portion, The light emitted from the light emitting portion of the light-collecting portion is incident on the first lens at a first half-value angle, and 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 greater than or equal to 0.1 mm and less than or equal to 1.0 mm.

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 greater than or equal to 0.1 mm and less than or equal to 0.5 mm.

12. The light source device according to any one of claims 9 to 11, wherein: The first lens covers the plurality of light exit portions collectively, and has at least one convex surface on the optical lens side.

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

14. The light source device according to any one of claims 9 to 11, wherein: The first lens includes a plurality of unit first lenses respectively arranged corresponding to the plurality of light exiting portions, and the plurality of unit first lenses are respectively separated.

15. The light source device according to claim 13 or 14, wherein: An optical axis of at least one of the unit first lenses is tilted relative 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 on the optical lens side.

17. The light source device according to any one of claims 13 to 15, wherein: The first lens unit is a cylindrical lens or a truncated cone lens.

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

19. The light source device according to claim 18, wherein: The internal total reflection lens is rotationally asymmetric with respect to the optical axis of the internal total reflection lens. The light emitting portion of the light condensing portion is covered by an inner surface of a recessed portion of the internal total reflection lens provided on the light emitting portion side of the light condensing portion.

20. The light source device according to any one of claims 1 to 19, wherein: The optical lens is composed of a plurality of lenses.

21. The light source device according to any one of claims 1 to 20, wherein: Each of the incident areas of the optical lens comprises: a first incident region into which light emitted from a light emitting portion corresponding to the incident region is incident; and In addition to this light, there is a second incident region into which light emitted from a light emitting portion adjacent to the light emitting portion is incident.

22. The light source device according to any one of claims 1 to 21, wherein: Each of the exit areas of the optical lens comprises: A first emission area from which light incident on the optical lens via an incident area corresponding to the emission area is emitted; and In addition to this light, there is a second emission area from which light incident on the optical lens from an incident area adjacent to the incident area is emitted.

23. The light source device according to any one of claims 1 to 22, wherein: The light-emitting portion and the irradiation area of ​​the light emitted from the light-emitting portion are in a point-symmetrical configuration relationship relative to a point on the axis connecting the center of the light-entering portion corresponding to the light-emitting portion and the center of the light-exiting portion corresponding to the light-entering portion.

24. The light source device according to claim 23, wherein: The points corresponding to the plurality of light emitting parts are the same point.

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

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

27. The light source device according to any one of claims 1 to 26, wherein: The plurality of light emitting portions are arranged on the upper surface of the substrate. A housing covering the plurality of light emitting units, the light focusing unit and the optical lens is disposed on the upper surface of the substrate. A height from the upper surface of the substrate to the uppermost surface of the housing is greater than or equal to 2.0 mm and less than or equal to 10.0 mm.

28. The light source device according to any one of claims 1 to 27, wherein: The plurality of light emitting sections can be individually lit.

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

30. A light source device, wherein: The light source device according to any one of claims 1 to 29 is a flash lamp.

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