Light source device

Abstract

The present invention provides a light source device. The light source device (100) comprises: a plurality of light-emitting devices capable of lighting independently; a first lens (11) disposed opposite the plurality of light-emitting devices; and a second lens (31) disposed opposite the first lens (11). The lower surface of the first lens (11) opposite the plurality of light-emitting devices comprises: an incident portion (12) disposed in the center and into which light from the plurality of light-emitting devices enters; and a light-guiding portion (21) disposed outside the incident portion (12) and guiding the light incident from the incident portion (12). The lower surface of the second lens (31) opposite the first lens (11) comprises a Fresnel lens surface (32) formed by a plurality of annular convex portions (34).

Description

Technical Field

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

[0002] Light sources using light-emitting devices such as light-emitting diodes have been widely used. For example, Patent Document 1 discloses a small light source device that can be used in a flashlight of a mobile phone.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2010-238837 Summary of the Invention

[0006] Technical problem to be solved by the invention

[0007] An object of embodiments of the present disclosure is to provide a light source device that can selectively irradiate light in a desired direction.

[0008] Technical solutions to technical problems

[0009] In order to solve the above-mentioned problem, the light source device of the embodiment of the present invention comprises: a plurality of light-emitting devices that can be lit independently, a first lens arranged opposite to the plurality of light-emitting devices, and a second lens arranged opposite to the first lens, the lower surface of the first lens opposite to the plurality of light-emitting devices comprises: an incident portion arranged in the center and into which light from the plurality of light-emitting devices is incident, and a light-guiding portion arranged on the outside of the incident portion and guiding the light incident from the incident portion, the lower surface of the second lens opposite to the first lens comprises a Fresnel lens surface formed by a plurality of annular convex portions.

[0010] In addition, the light source device of the embodiment of the present disclosure has: a plurality of light-emitting devices that can be lit independently, and a first lens arranged opposite to the plurality of light-emitting devices, the lower surface of the first lens opposite to the plurality of light-emitting devices has: an incident portion arranged in the center of the lower surface and into which light from the plurality of light-emitting devices is incident, and a light-guiding portion arranged on the outer side of the incident portion and which guides the light incident from the incident portion, and the upper surface on the opposite side of the lower surface of the first lens has a Fresnel lens surface formed by a plurality of annular convex portions.

[0011] Effects of the Invention

[0012] According to the light source device of the embodiment of the present disclosure, it is possible to provide a light source device that can selectively irradiate light in a desired direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a cross-sectional view schematically showing the structure of the light source device according to the first embodiment.

[0014] Figure 2 This is a plan view of the light source device according to the first embodiment, with the casing omitted, as viewed from the second lens side.

[0015] Figure 3 It is a plan view showing the arrangement of a plurality of light-emitting devices in the light source device according to the first embodiment.

[0016] Figure 4A yes Figure 3 Cross-sectional view of the IVA-IVA line.

[0017] Figure 4B It is a cross-sectional view schematically showing another structure of the light emitting device of the light source device according to the first embodiment.

[0018] Figure 5 This is a plan view of the light source device according to the first embodiment as viewed from the light emitting device side of the first lens.

[0019] Figure 6 This is a plan view of the light source device according to the first embodiment, viewed from the first lens side of the second lens.

[0020] Figure 7A This is a plan view showing the positional relationship between the first and second lenses and one lighted light-emitting device 1e on the center side in the light source device of the first embodiment, as viewed from the second lens side, with the housing omitted.

[0021] Figure 7B It is schematically represented Figure 7A A cross-sectional view of the light path of a light source device.

[0022] Figure 7C Yes Figure 7B Schematic diagram of the illumination distribution of the light source device.

[0023] Figure 8A This is a plan view showing the positional relationship between the first and second lenses and one of the light-emitting devices 1 b on the illuminated side in the light source device of the first embodiment, viewed from the second lens side, with the casing omitted.

[0024] Figure 8B It is schematically represented Figure 8A A cross-sectional view of the light path of a light source device.

[0025] Figure 8C Yes Figure 8B Schematic diagram of the illumination distribution of the light source device.

[0026] Figure 9AThis is a plan view showing the positional relationship between the first and second lenses and one light-emitting device 1c on the corner side of the light source device according to the first embodiment, viewed from the second lens side, with the casing omitted.

[0027] Figure 9B It is schematically represented Figure 9A A cross-sectional view of the light path of a light source device.

[0028] Figure 9C Yes Figure 9B Schematic diagram of the illumination distribution of the light source device.

[0029] Figure 10 It is a cross-sectional view schematically showing the structure of a light source device according to a second embodiment.

[0030] Figure 11 It is a cross-sectional view schematically showing the structure of a light source device according to a third embodiment.

[0031] Figure 12 It is a cross-sectional view schematically showing the structure of a light source device according to a fourth embodiment.

[0032] Figure 13 It is a cross-sectional view schematically showing the structure of a light source device according to a fifth embodiment.

[0033] Figure 14 It is a cross-sectional view schematically showing the structure of a light source device according to a sixth embodiment.

[0034] Figure 15 It is a cross-sectional view schematically showing the structure of a light source device according to the seventh embodiment.

[0035] Figure 16 It is a cross-sectional view schematically showing the structure of a light source device according to an eighth embodiment.

[0036] Figure 17A It is a cross-sectional view schematically showing the structure of a light source device according to a ninth embodiment.

[0037] Figure 17B This is a plan view of the light source device according to the ninth embodiment, viewed from the light emitting device side of the first lens.

[0038] Figure 18A 1 is a schematic diagram showing the lighting state of the light emitting devices of the light source device of the embodiment, and shows a state where all nine light emitting devices 1 a to 1 i are lit.

[0039] Figure 18B Yes Figure 18A Schematic diagram of the illumination distribution of the light source device.

[0040] Figure 19A1 is a schematic diagram showing the lighting state of the light emitting devices of the light source device of the embodiment, and shows that eight light emitting devices 1a to 1d and 1f to 1i among the nine light emitting devices 1a to 1i are lighting.

[0041] Figure 19B Yes Figure 19A Schematic diagram of the illumination distribution of the light source device.

[0042] Figure 20A 1 is a schematic diagram showing the lighting state of the light emitting devices of the light source device of the embodiment, and shows a state where five light emitting devices 1a to 1c, 1f, and 1i among the nine light emitting devices 1a to 1i are lighting.

[0043] Figure 20B Yes Figure 20A Schematic diagram of the illumination distribution of the light source device. DETAILED DESCRIPTION

[0044] With reference to the accompanying drawings, the light source device according to the embodiment of the present invention is described. However, the following method is used to illustrate the light source device for embodying the technical idea of the present embodiment, but is not limited to the following method. In addition, the size, material, shape, and relative configuration of the structural accessories described in the embodiment are not intended to limit the scope of the present invention to these unless otherwise specified, and are simply illustrative examples. It should be noted that the size, positional relationship, etc. of the components shown in the various drawings may be exaggerated for the purpose of clear description. In addition, in the following description, for the same names and marks, the same or homogeneous components are represented, and detailed descriptions are appropriately omitted.

[0045] <First embodiment>

[0046] like Figure 1 、 Figure 3 As shown, the light source device 100 of the first embodiment includes: a plurality of light-emitting devices 1a~1i that can be lit independently, a first lens 11 arranged opposite to the plurality of light-emitting devices 1a~1i, and a second lens 31 arranged opposite to the first lens 11. The lower surface of the first lens 11 opposite to the light-emitting devices 1a~1i includes: an incident portion 12 arranged in the center and into which light from the plurality of light-emitting devices 1a~1i is incident, and a light-guiding portion 21 arranged on the outside of the incident portion 12 and guiding the light incident from the incident portion 12. The lower surface of the second lens 31 opposite to the first lens 11 includes a Fresnel lens surface 32 formed by a plurality of annular protrusions 34.

[0047] Alternatively, the light source device 100 may include a substrate 41 on which a plurality of light-emitting devices 1a to 1i are mounted, and a housing 51 with an opening 52 facing and covering the second lens 31. The first lens 11 is preferably fixed to the substrate 41. Furthermore, the light source device 100 preferably has the second lens 31 fixed to the first lens 11 fixed to the substrate 41. The following describes the various components of the light source device.

[0048] (Light-emitting device)

[0049] A plurality of light emitting devices are mounted on a substrate 41 as light emitting devices 1a to 1i that can light independently. Figure 3 As shown, the plurality of light-emitting devices 1a-1i are preferably arranged in a rectangular shape as a whole when viewed from above. Furthermore, the plurality of light-emitting devices 1a-1i are preferably arranged in a square grid or rectangular grid with two or more rows and two columns. For example, the light-emitting devices are preferably arranged in a pattern of four or nine light-emitting devices at equal intervals in the vertical and horizontal directions, forming a rectangular area when viewed from above.

[0050] like Figure 4A As shown, the light emitting device 1a is mounted on a substrate 41 with its upper surface as the light emitting surface and its lower surface opposite to the upper surface as the mounting surface. The light emitting device 1a includes: a light emitting element 2, a light transmissive component 4 provided on the upper surface of the light emitting element 2, and a covering component 5 covering the side surfaces of the light emitting element 2 and the side surfaces of the light transmissive component 4 except for the upper surface of the light transmissive component 4. It should be noted that, as shown in FIG. Figure 4B As shown, the side surface of the light-transmitting component 4 may also be exposed from the covering component 5. Positive and negative electrodes 3 are preferably provided on the lower surface of the light-emitting element 2 on the opposite side to the upper surface. In addition, the top view shape of the light-emitting device 1a may be, for example, a quadrilateral, but may also be a polygon such as a circle, an ellipse, a triangle, or a hexagon. It should be noted that the light-emitting devices 1b to 1i also have the same structure as the light-emitting device 1a. In addition, instead of placing multiple light-emitting devices on the substrate 41, a light-emitting device having multiple light-emitting elements 2 may be placed on the substrate 41. For example, multiple light-emitting elements 2 having a light-transmitting component 4 may be arranged at equal intervals in the vertical and horizontal directions and formed integrally as a light-emitting device through the covering component 5. In this case, the multiple light-emitting elements 2 may also be placed on the substrate 41 to light up independently.

[0051] The light emitting element 2 is preferably formed of various semiconductors such as group III to V compound semiconductors and group II to VI compound semiconductors. As the semiconductor, In is preferably used. X Al Y Ga 1-X-Y Nitride-based semiconductors such as N (0≦X, 0≦Y, X+Y≦1), InN, AlN, GaN, InGaN, AlGaN, InGaAlN, etc. can also be used.

[0052] The light-transmitting member 4 is a plate-shaped member having a generally rectangular shape when viewed from above, and is positioned to cover the upper surface of the light-emitting element 2. The light-transmitting member 4 can be formed from a light-transmitting resin material, ceramic, glass, or other inorganic material. Resin materials include thermosetting resins such as silicone, silicone-modified resins, epoxy resins, and phenolic resins. Alternatively, thermoplastic resins such as polycarbonate, acrylic, methylpentene, and polynorbornene resins can be used. Silicone resins or modified resins thereof are particularly preferred due to their excellent light and heat resistance. It should be noted that the term "light-transmitting" herein refers to the property of transmitting at least 60% of the light from the light-emitting element 2. Furthermore, the light-transmitting member 4 may also contain a light-diffusing member or a phosphor that converts the wavelength of at least a portion of the light from the light-emitting element 2. Examples of light-transmitting members 4 containing a phosphor include materials containing a phosphor in the aforementioned resin materials, ceramics, glass, or the like, and fired products of the phosphor. Alternatively, the light-transmitting member 4 may be formed by forming a resin layer containing the phosphor or the light-diffusing member on the lower surface of a molded body of the resin, glass, or ceramic material.

[0053] For example, by using a blue light-emitting element as the light-emitting element 2 and containing a yellow phosphor in the light-transmitting member 4 , a light-emitting device 1 that emits white light can be obtained.

[0054] As the phosphor contained in the light-transmitting member 4, for example, Y3Al5O 12 Yellow phosphors such as YAG phosphor represented by Ce, silicate phosphor, or red phosphors such as CASN phosphor represented by CaAlSiN 3:Eu and KSF phosphor represented by K2SiF6:Mn.

[0055] As the light diffusion member contained in the light-transmitting member 4 , for example, titanium dioxide, barium titanate, aluminum oxide, silicon dioxide, or the like can be used.

[0056] The covering part 5 is a part that covers the side surfaces of the light-emitting element 2 and the light-transmitting part 4, and directly or indirectly covers the side surfaces of the light-emitting element 2 and the light-transmitting part 4. The upper surface of the light-transmitting part 4 is exposed from the covering part 5, and constitutes the light-emitting surface (that is, the main light extraction surface) of the light-emitting device 1. In order to improve the light extraction efficiency, the covering part 5 is preferably composed of a part with high light reflectivity. For example, the covering part 5 can use a resin material containing a light-reflecting substance such as a white pigment. As light-reflecting substances, titanium dioxide, zinc oxide, magnesium oxide, magnesium carbonate, magnesium hydroxide, calcium carbonate, calcium hydroxide, calcium silicate, magnesium silicate, barium titanate, barium sulfate, aluminum hydroxide, aluminum oxide, zirconium oxide, silicon dioxide, etc. are mentioned. It is preferred to use one of the above substances alone, or to use a combination of two or more of the above substances. In addition, as the resin material, it is preferred to use a resin material with a thermosetting resin such as epoxy resin, silicone resin, silicon-modified resin, phenolic resin as the main component as the base material.

[0057] It should be noted that the cover member 5 may be formed of a member having light-transmitting properties with respect to visible light, as necessary.

[0058] (First lens)

[0059] The first lens 11 is arranged opposite to the light-emitting surfaces of the light-emitting devices 1a to 1i. The first lens 11 collects light from the plurality of light-emitting devices 1a to 1i and emits it toward the second lens 31. As the first lens 11, for example, a collimating lens can be cited. The first lens 11 is preferably formed of a transparent resin such as polycarbonate resin, acrylic resin, silicone resin, or epoxy resin. It should be noted that the shape of the first lens 11 is preferably circular or elliptical when viewed from above, but may also be a polygon such as a quadrilateral or hexagon.

[0060] The first lens 11 has, on its lower surface facing the plurality of light-emitting devices 1a to 1i, an incident portion 12, arranged in the center, into which light from the light-emitting devices 1a to 1i enters, and a light-guiding portion 21, arranged concentrically outside the incident portion 12, which guides the light incident from the incident portion 12. Furthermore, when the light source device 100 is used as a flashlight for a mobile phone, the lower surface of the first lens 11 preferably has a four-fold rotationally symmetrical shape when viewed from above, considering that the imaging range of a typical camera is rectangular. Alternatively, the lower surface of the first lens 11 may have a two-fold rotationally symmetrical shape when viewed from above.

[0061] The incident portion 12 is a recessed portion formed on the lower surface of the first lens 11, sized to encompass multiple light-emitting devices 1a to 1i when viewed from above. The bottom surface of the incident portion 12 is preferably a quadrilateral when viewed from above, but may also be circular, elliptical, triangular, quadrilateral, hexagonal, or other shapes. The bottom surface of the recess is preferably formed as a Fresnel lens surface. Specifically, the incident portion 12 preferably includes a centrally located lower surface convex portion 14 that protrudes toward the light-emitting devices 1a to 1i, and corner portions 16 arranged concentrically around the lower surface convex portion 14 and convex toward the light-emitting devices 1a to 1i. The corner portions 16 are preferably arranged concentrically around the lower surface convex portion 14, either continuously or intermittently. Here, the corner portions 16 are formed as a single concentric circle, but may also be formed as multiple circles. The presence of the corner portions 16 reduces the radius of the lower surface convex portion 14, thereby allowing more light from the light-emitting devices 1a to 1i to be introduced, improving light-collection performance. It should be noted that the inner side surface 22 of the recessed portion is preferably a flat surface, but may also be a curved surface.

[0062] The light guide portion 21 is arranged on the lower surface side of the first lens 11, outside the incident portion 12. The light guide portion 21 has an inclined surface 23 that reflects the light incident from the incident portion 12. The light guide portion 21 is preferably formed in a ring shape, continuously or intermittently, concentrically around the incident portion 12. As a result, among the lights emitted from the light-emitting devices 1a to 1i, the light that has a large emission angle and is emitted outside the desired irradiation range can be collected by the light guide portion 21, and the light extraction efficiency can be improved. The inclination angle of the inclined surface 23 with respect to the optical axis is appropriately set to an angle that can collect the light from the light-emitting devices 1a to 1i for incidence and reflection.

[0063] The upper surface of the first lens 11 preferably includes a centrally located upper surface convex portion 17 projecting toward the second lens 31, and a flat portion 19 disposed around the upper surface convex portion 17 and extending through an upper surface concave portion 18 continuous with the upper surface convex portion 17. The upper surface concave portion 18 is preferably formed concavely around the upper surface convex portion 17 in a concave toroidal shape. Furthermore, the upper surface convex portion 17 is preferably larger than the lower surface convex portion 14 when viewed from above. The presence of the upper surface convex portion 17 in the first lens 11 facilitates the extraction of light incident from the lower surface convex portion 14 and / or the corner portion 16 of the incident portion 12 toward the second lens. Furthermore, the presence of the upper surface concave portion 18 in the first lens 11 facilitates the extraction of light reflected from the inclined surface 23 toward the second lens. Furthermore, the presence of the upper surface concave portion 18 further reduces the inclination angle of the inclined surface 23 relative to the optical axis. This reduces the lens diameter of the first lens 11, and consequently, the lens diameter of the second lens 31. Consequently, the diameter of the opening 52 of the housing 51 can be reduced. This makes it difficult to see the inside of the opening 52, thereby improving the appearance.

[0064] It should be noted that if Figure 5 As shown, the first lens 11 includes a first main body portion 24 having an incident portion 12 and a light guide portion 21, and a first side edge portion 25 extending laterally from the outer edge of the first main body portion 24. The first side edge portion 25 preferably includes a first upper region 25a and a first leg region 25b extending from the first upper region 25a toward the substrate 41. The first side edge portion 25 extends laterally from the outer edge of the first main body portion 24, surrounding the first main body portion 24 and forming an annular shape. The upper portion of the first upper region 25a is formed flat and is formed at the same height as the upper end of the upper surface protrusion 17 of the first main body portion 24. As an example, the first leg region 25b is continuous with the side of the first upper region 25a and formed into a cylindrical shape. Thus, in the first lens 11, the lower surface of the first foot region 25b of the first side edge portion 25 and the upper surface of the substrate 41 can be fixed via the adhesive component 61, and the upper surface of the first upper region 25a of the first side edge portion 25 and the lower surface of the second lens 31 can be fixed via the adhesive component 61. Here, the adhesive component 61 can use a known adhesive material such as tape. As an example, the first main body portion 24 and the first side edge portion 25 of the first lens 11 are processed from the same component and formed integrally. It should be noted that the first main body portion 24 and the first side edge portion 25 can also be formed from different materials. For example, the first main body portion 24 can be formed from a light-transmitting resin or glass material, and the first side edge portion 25 can be formed from a metal such as an aluminum alloy.

[0065] (Second lens)

[0066] The second lens 31 is positioned opposite the first lens 11, refracting light emitted from the first lens 11 and directing it toward the desired illumination range. Like the first lens 11, the second lens 31 is preferably formed from a light-transmitting resin such as polycarbonate, acrylic, silicone, or epoxy. The outer shape of the second lens 31 is preferably circular or elliptical when viewed from above, but may also be a polygonal shape such as a quadrilateral or hexagon.

[0067] The second lens 31 is preferably a lens having convex or concave portions, such as a Fresnel lens. The second lens 31 has a Fresnel lens surface 32 formed with multiple annular convex portions 34 on its lower surface facing the first lens 11. The Fresnel lens surface 32 includes a central convex portion 33 that is convex toward the first lens 11, and multiple annular convex portions 34 arranged concentrically outside the central convex portion 33 and convex toward the first lens 11. The multiple annular convex portions 34 are preferably arranged concentrically with respect to the central convex portion 33 in a plan view, forming an annular shape along the shape of the central convex portion 33. In other words, when the central convex portion 33 is circular in plan view, the convex portions 34 form a circular annular shape, and when the central convex portion 33 is rectangular in plan view, the convex portions 34 form a rectangular annular shape. The Fresnel lens surface 32 is preferably sized to encompass the incident portion 12 and light guide portion 21 of the first lens 11 in plan view.

[0068] It should be noted that if Figure 1 、 Figure 6 As shown, the second lens 31 preferably includes a second main body 37 having a Fresnel lens surface 32 on the first lens side and a flat surface 36 on the opposite side of the Fresnel lens surface 32, facing the opening 52 of the housing 51; and a second side edge 38 extending laterally from the outer edge of the second main body 37. The second side edge 38 preferably includes a second foot region 38a extending from the outer edge of the second main body 37 toward the first lens 11, and a second mounting region 38b extending laterally from the lower end of the second foot region 38a. The flat surface 36 is formed to be of the same size or larger than the Fresnel lens surface 32 in a plan view. When the second main body 37 is inserted into the opening 52 of the housing 51, it is formed to be at the same height as the upper surface of the housing 51. Alternatively, the flat surface 36 of the second lens 31 may be textured or have fine irregularities.

[0069] The second side edge portion 38 extends laterally from the outer edge of the second main body portion 37 to form a ring shape, and the upper surface is formed to be the same surface as the flat surface 36. The second foot area 38a is formed so that the lower end surface is located closer to the bottom than the lower surface of the Fresnel lens surface 32. The second mounting area 38b extends laterally from the lower side surface of the second foot area 38a to form a ring shape. The lower end of the second mounting area 38b is formed flatly to form the same plane as the lower end of the second foot area 38a. Moreover, the second mounting area 38b is preferably configured to face the first upper area 25a of the first lens 11. Thus, the upper surface of the first side edge portion 25 and the lower surface of the second side edge portion 38 can be fixed via the adhesive component 61. It should be noted that in the second lens 31, the second foot area 38a is formed closer to the center side of the first lens 11 than the first upper area 25a. That is, as Figure 2As shown, in a top view, the second lens 31 is contained within the first lens 11 and fixed.

[0070] The second lens 31 can be arranged so that the lower surface of the second leg region 38a is located below the Fresnel lens surface 32, thereby separating the first body portion 24 of the first lens 11 and the second body portion 37 of the second lens 31. This can suppress interference between the first lens 11 and the second lens 31.

[0071] Furthermore, in the second lens 31, the flat surface 36 of the second main body portion 37 is preferably inserted into the opening 52 of the housing 51 with the flat surface 36 exposed, and the second leg region 38a is preferably disposed so that the outer peripheral surface abuts against the inner peripheral surface of the opening 52. Furthermore, in the light source device 100, the lower surface of the second side edge portion 38 of the second lens 31 is preferably fixed to the upper surface of the first side edge portion 25 of the first lens 11 via an adhesive member 61.

[0072] (Substrate)

[0073] The substrate 41 preferably carries a plurality of light-emitting devices 1a to 1i and has wiring 42 arranged on its surface and / or within its interior. On the substrate 41, the wiring 42 is connected to the positive and negative electrodes 3 of the light-emitting devices 1a to 1i via a conductive adhesive 62, thereby electrically connecting the substrate 41 to the light-emitting devices 1a to 1i. It should be noted that the structure and size of the wiring 42 on the substrate 41 are determined based on the structure and size of the electrodes 3 of the light-emitting devices 1a to 1i.

[0074] The substrate 41 is preferably made of an insulating material that is difficult to transmit light emitted from the light-emitting devices 1a to 1i and external light. A material having a certain degree of strength is also preferred. Specifically, the substrate 41 can be made of a ceramic such as alumina, aluminum nitride, or mullite; a resin such as a phenolic resin, an epoxy resin, a polyimide resin, a BT resin (bismaleimidetriazine resin), or a polyphthalamide resin.

[0075] The wiring 42 can be made of copper, iron, nickel, tungsten, chromium, aluminum, silver, gold, titanium, palladium, rhodium, or alloys of the above metals. In addition, from the perspective of wettability of the conductive adhesive member 62 and / or light reflectivity, a layer of silver, platinum, aluminum, rhodium, gold, or alloys of the above metals can be provided on the surface of the wiring 42.

[0076] (case)

[0077] The housing 51 covers the opening 52 opposite to the second lens 31, and may be, for example, a part of the housing of a mobile phone that uses the light source device 100 as a flash light source. The opening 52 is preferably formed larger than the second main body 37 in order to expose the flat surface 36 of the second main body 37 of the second lens 31. In addition, the housing 51 may also have a foot 53 for fixing to the substrate 41. In addition, the housing 51 is preferably formed by a light-shielding component, and in order to be able to limit the light distribution direction of the light emitted from the light source device 100, it is preferably composed of a resin material containing fillers such as a light-reflecting component and a light-absorbing component. The shape of the opening 52 can be, for example, circular, elliptical, triangular, quadrilateral, hexagonal, etc. when viewed from above.

[0078] In the light source device 100 , by combining the first lens 11 and the second lens 31 , it is possible to irradiate light in a desired direction corresponding to the lighting arrangement of the plurality of light emitting devices 1 a to 1 i.

[0079] For example, Figure 7A As shown, among the plurality of light emitting devices arranged in a rectangular shape in plan view, when a light emitting device 1e arranged in the center of the rectangle is lit, as shown in FIG. Figure 7B As shown, the light mainly passing through the lower surface convex portion 14 of the first lens 11 is refracted by the upper surface convex portion 17 and the second lens 31, and is irradiated toward the rectangular center of the predetermined irradiation range. Figure 7C It shows the illuminance distribution when the light emitting element arranged in the center of the rectangle is turned on. Figure 8A As shown, when one of the light emitting devices 1b arranged at an end portion other than a corner portion of the rectangle among the plurality of light emitting devices is lit, as shown in FIG. Figure 8B As shown, the light mainly passing through the lower surface convex portion 14 of the first lens 11 and the light guide portion 21 is refracted by the upper surface convex portion 17, the upper surface concave portion 18 and the second lens 31, and irradiates the rectangular end portions of the predetermined irradiation range except the corners. Figure 8C It shows the illuminance distribution when the light emitting elements arranged at the ends of the rectangle except the corners are turned on. Figure 9A As shown, among the plurality of light emitting devices, when a light emitting device 1c arranged at a corner of a rectangle is lit, as shown in FIG. Figure 9B As shown, the light mainly passing through the lower surface convex portion 14 of the first lens 11 and the light guide portion 21 is refracted by the upper surface convex portion 17, the upper surface concave portion 18 and the second lens 31, and irradiates the rectangular corners of the predetermined irradiation range. Figure 9C This shows the illuminance distribution when the light-emitting elements arranged at the corners of the rectangle are turned on.

[0080] Furthermore, when all of the plurality of light emitting devices 1a to 1i are turned on, by individually adjusting the output of each light emitting device, an arbitrary illuminance distribution can be generated within a limited power range.

[0081] Furthermore, in the light source device 100 , since the second lens 31 disposed on the emission surface (top surface) side has the Fresnel lens surface 32 , the light emitting devices 1 a to 1 i inside the light source device 100 can be hardly seen from the outside, thereby improving the appearance.

[0082] In light source device 100, as described above, first lens 11 is fixed to substrate 41, and second lens 31 is fixed to first lens 11 fixed to substrate 41, with second body 37 inserted into opening 52 of housing 51. Therefore, when light source device 100 is used as a flashlight light source for a mobile phone or the like, device thickness H1 of light source device 100 can be reduced. This contributes to a reduction in the thickness of the mobile phone.

[0083] <Second embodiment>

[0084] Figure 10 It is a cross-sectional view schematically showing the structure of a light source device according to a second embodiment.

[0085] The light source device 100A of the second embodiment has the same structure as the light source device 100 of the first embodiment, except that the second lens 31 is fixed to the housing 51 and the first side edge 25 of the first lens 11A is actually formed only by the first upper region 25a. The following description focuses on the parts that are different from the light source device 100, and the same structures are omitted as appropriate.

[0086] The light source device 100A includes a substrate 41 on which a plurality of light-emitting devices 1a to 1i are mounted, a housing 51 covering the second lens 31 with an opening 52 facing the second lens 31, and a first lens 11A disposed opposite the second lens 31. Furthermore, the first lens 11A includes a first main body 24 having an incident portion 12 and a light guide portion 21, and a first side edge 25A extending laterally from the outer edge of the first main body 24. Furthermore, the first side edge 25A includes a first upper region 25a. Furthermore, the first lens 11A is connected to the second mounting region 38b of the second lens 31 via an adhesive member 61 in the first upper region 25a and is disposed separately from the substrate 41. Therefore, the first lens 11A and the second lens 31 can be mounted on the housing 51 while already bonded, thereby improving manufacturing efficiency. Furthermore, the optical axes of the first lens 11A and the second lens 31 can be aligned before being mounted in the housing 51, making it easier to adjust their positional relationship and suppressing misalignment between the optical axes of the first lens 11A and the second lens 31. Furthermore, degradation in the visual appearance caused by misalignment between the lenses can be suppressed.

[0087] <Third embodiment>

[0088] Figure 11 It is a cross-sectional view schematically showing the structure of a light source device according to a third embodiment.

[0089] The light source device 100B of the third embodiment has the same structure as the light source device 100 of the first embodiment, except that the first lens 11 is fixed to the substrate 41 , the second lens 31 is fixed to the housing 51 , and the first lens 11 and the second lens 31 are not fixed to each other.

[0090] In light source device 100B, second lens 31 is mounted on the upper surface of second mounting region 38b of second lens 31 to housing lower surface 51a via adhesive member 61, and first lens 11 is mounted on the lower surface of first leg region 25b of first lens 11 via adhesive member 61. Thus, in light source device 100B, by mounting first lens 11 on substrate 41 and second lens 31 on housing 51, flexibility in the manufacturing process can be improved.

[0091] <Fourth embodiment>

[0092] Figure 12 It is a cross-sectional view schematically showing the structure of a light source device according to a fourth embodiment.

[0093] The light source device 100C of the fourth embodiment has the same structure as the light source device 100 of the first embodiment, except that a transparent member 54 is embedded in the opening 52 of the housing 51 and the second side edge 38C of the second lens 31C is actually formed only by the second leg region 38a. It should be noted that the transparent member 54 is preferably made of glass, transparent resin, or the like.

[0094] The light source device 100C includes a substrate 41 on which a plurality of light-emitting devices 1a to 1i are mounted, a housing 51 having an opening 52, a first lens 11, and a second lens 31C. A transparent member 54 is embedded in the opening 52. Furthermore, the center of the first lens 11 and the center of the second lens 31 are arranged at the center of the transparent member 54. The second lens 31C includes a second main body 37 having a Fresnel lens surface 32 and a flat surface 36 opposite the Fresnel lens surface 32, and a second side edge 38C extending laterally from the outer edge of the second main body 37.

[0095] Furthermore, the second side edge portion 38C includes a second leg region 38a extending laterally from the outer edge of the second main body portion 37. The second leg region 38a is formed so that its lower end surface is located below the Fresnel lens surface 32. Furthermore, the second leg region 38a is formed into a cylindrical shape at the outer edge of the second main body portion 37. The second leg region 38a is formed so that its lower end surface faces the first upper region 25a of the first lens 11.

[0096] The second lens 31C is connected to the housing lower surface 51a of the housing 51 at the upper surface of the second leg region 38a via an adhesive member 61. Furthermore, the lower end surface of the second leg region 38a is connected to the first upper region 25a of the first lens 11 via an adhesive member 61. Furthermore, in the first lens 11, the upper surface of the substrate 41 and the lower surface of the first leg region 25b are fixed via an adhesive member 61.

[0097] In light source device 100C, the transparent member 54 serving as a protective component prevents the flat surface 36 of the second lens 31 from being exposed outside the housing 51, thereby suppressing degradation. Furthermore, when light source device 100C is used as a flashlight in a mobile phone, the presence of the transparent member 54, the second lens 31, and the first lens 11 between the light-emitting devices 1a to 1i makes it difficult to see the light-emitting devices 1a to 1i within light source device 100C from the outside, thereby enhancing the aesthetics of the device. Furthermore, since light source device 100C is bonded to numerous locations by adhesive member 61, it is possible to prevent positional displacement due to collisions.

[0098] <Fifth embodiment>

[0099] Figure 13 It is a cross-sectional view schematically showing the structure of a light source device 100D according to the fifth embodiment.

[0100] The light source device 100D of the fifth embodiment has the same structure as the light source device 100C of the fourth embodiment, except that the second lens 31C is fixed to the housing 51 and the first side edge 25A of the first lens 11A is substantially formed only by the first upper region 25a.

[0101] The light source device 100D includes a substrate 41 on which a plurality of light-emitting devices 1a to 1i are mounted, a housing 51 covering a second lens 31C with an opening 52 facing the lens, and a first lens 11A disposed opposite the second lens 31C. A transparent member 54 is embedded in the opening 52. The first lens 11A includes a first main body 24 having an incident portion 12 and a light guide portion 21, and a first side edge 25A extending laterally from the outer edge of the first main body 24. The first side edge 25A is substantially formed only by the first upper region 25a. The second lens 31C includes a second main body 37 having a Fresnel lens surface 32 and a flat surface 36 opposite the Fresnel lens surface 32, and a second side edge 38C extending laterally from the outer edge of the second main body 37. The second side edge 38C includes a second leg region 38a extending laterally from the outer edge of the second main body 37.

[0102] Furthermore, in order to position the flat surface 36 of the second main body portion 37 opposite the transparent member 54, the second lens 31C has its housing lower surface 51a around the opening 52 fixed to the upper surface of the second leg region 38a via an adhesive member 61. Furthermore, in the second lens 31C, the lower surface of the second leg region 38a of the second side edge portion 38C is fixed to the upper surface of the first upper region 25a of the first side edge portion 25A of the first lens 11A via an adhesive member 61. It should be noted that the first lens 11A and the second lens 31C are preferably arranged so that the center of the transparent member 54, the optical axis center of the first lens 11A, and the optical axis center of the second lens 31C are aligned.

[0103] In the light source device 100D, the transparent member 54 can be placed in the housing 51 with the first lens 11A and the second lens 31C bonded together by the adhesive member 61 so as to face the housing lower surface 51 a of the housing 51 via the adhesive member 61 , thereby improving work efficiency.

[0104] Furthermore, the positional relationship between the bonded first lens 11A and second lens 31C can be easily adjusted in conjunction with the position of the opening 52 , thereby suppressing deviation from the opening 52 and preventing deterioration in appearance caused by the deviation.

[0105] <Sixth embodiment>

[0106] Figure 14 It is a cross-sectional view schematically showing the structure of a light source device 100E according to the sixth embodiment.

[0107] The light source device 100E of the sixth embodiment has the same structure as the light source device 100C of the fourth embodiment, except that the first lens 11 is fixed to the substrate 41, the second lens 31E is fixed to the shell 51, the second side edge 38E of the second lens 31 is actually formed only by the second foot area 38a, and the position of the bonding by the adhesive component 61 is different.

[0108] Light source device 100E includes a substrate 41 on which a plurality of light-emitting devices 1a to 1i are mounted, a housing 51 covering a second lens 31E with an opening 52 facing the substrate 41, and a first lens 11 disposed opposite the second lens 31E. A transparent member 54 is embedded in the opening 52. Furthermore, first lens 11 includes a first main body 24 having an incident portion 12 and a light guide portion 21, and a first side edge 25 extending laterally from the outer edge of first main body 24. First side edge 25 includes a first upper region 25a extending laterally from the outer edge of first main body 24, and a first foot region 25b extending from the first upper region 25a toward substrate 41.

[0109] The second lens 31E includes a second main body 37 having a Fresnel lens surface 32 and a flat surface 36 opposite the Fresnel lens surface 32, and a second side edge 38 extending laterally from the outer edge of the second main body 37. The second lens 31E is arranged so that the flat surface 36 of the second main body 37 faces the transparent member 54. In the second side edge 38E, the lower surface of the second leg region 38a is located above the Fresnel lens surface 32. The second leg region 38a extends laterally from the outer edge of the second main body 37 and has a predetermined thickness. In the second lens 31E, the housing lower surface 51a surrounding the opening 52 is secured to the upper surface of the second leg region 38a via an adhesive member 61. Note that, to protect the Fresnel lens surface 32, the lower surface of the second leg region 38a may be located below the Fresnel lens surface 32.

[0110] In the first lens 11, the upper surface of the substrate 41 and the lower surface of the first leg region 25b are fixed via an adhesive member 61. It should be noted that the second lens 31E is connected to the housing lower surface 51a via an adhesive member 61 so that it can be arranged at a predetermined distance from the first lens 11. Furthermore, the first lens 11 and the second lens 31E are preferably arranged so that the centers of their respective optical axes are aligned with the center of the transparent member 54.

[0111] In light source device 100E, because first lens 11 is mounted on substrate 41 and second lens 31E is mounted on housing 51, individual replacement of first lens 11 and second lens 31E is easy. In light source device 100E, because second lens 31E is mounted on housing 51, alignment of second lens 31E and housing 51 is facilitated, minimizing positional deviation and enhancing the aesthetic appearance.

[0112] <Seventh embodiment>

[0113] Figure 15 It is a cross-sectional view schematically showing the structure of a light source device 100F according to the seventh embodiment.

[0114] A light source device 100F according to the seventh embodiment has the same structure as the light source device 100C according to the fourth embodiment, except that the second lens 31C fixed to the first lens 11 fixed to the substrate 41 is not fixed to the housing 51 .

[0115] In light source device 100F, because second lens 31C, which is fixed to first lens 11, is not fixed to housing 51, both first lens 11 and second lens 31C can be replaced simultaneously. Furthermore, in light source device 100F, second lens 31C can be fixed to first lens 11 fixed to substrate 41 after first lens 11 is fixed to substrate 41. In other words, second lens 31C can be placed after first lens 11 is positioned in conjunction with light-emitting device 1. This prevents deterioration in optical characteristics and appearance caused by misalignment between the optical axis of light-emitting device 1 and the lens center.

[0116] <Eighth embodiment>

[0117] Figure 16 It is a cross-sectional view schematically showing the structure of a light source device 100G according to the eighth embodiment.

[0118] The light source device 100G of the eighth embodiment has the same structure as the light source device 100F of the seventh embodiment, except that the second lens 31C is omitted, and the upper surface of the first lens 11B fixed to the substrate 41 is formed of a Fresnel lens surface 32. Furthermore, in light source device 100G, the Fresnel lens surface 32 includes a central convex portion 33, which serves as the emission surface and is convex toward the housing 51, and a plurality of annular convex portions 34, which are arranged concentrically along the shape of the central convex portion 33 and are convex toward the housing 51. Furthermore, the inclusion of the Fresnel lens surface 32 around the first lens 11B in light source device 100G allows for a reduction in the overall thickness of the light source device compared to light source device 100F. Therefore, when light source device 100G is used as a flashlight source for a mobile phone, for example, the device thickness can be further reduced, contributing to a reduction in the thickness of the mobile phone.

[0119] In light source device 100G, first lens 11B has a lower surface formed by incident portion 12 and light guide portion 21, and an upper surface formed by Fresnel lens surface 32. Therefore, in light source device 100G, light from light-emitting device 1 is guided through the lower surface of first lens 11B without loss, reducing light loss. This also directly reduces the size of opening 52 in housing 51, improving luminous efficiency and enabling control of wide-angle light distribution. Furthermore, light source device 100G can prevent deterioration in optical characteristics and appearance caused by misalignment between the optical axis of light-emitting device 1 and the center of first lens 11B.

[0120] <Ninth embodiment>

[0121] Figure 17A It is a cross-sectional view schematically showing the structure of a light source device 100H according to the ninth embodiment. Figure 17BIt is a plan view of the light source device 100H according to the ninth embodiment, viewed from the light emitting device side of the first lens 11C.

[0122] The light source device 100H of the ninth embodiment has the same structure as the light source device 100D of the fifth embodiment, except that it does not have the second lens 31C, the upper surface of the first lens 11C fixed to the shell 51 is composed of the Fresnel lens surface 32, and the lower surface of the first lens 11C is a quadratic rotational symmetric shape that is more complex than the four-fold rotational symmetry when viewed from above.

[0123] Furthermore, in light source device 100H, the Fresnel lens surface 32 includes a central convex portion 33, which serves as the emission surface and is convex on the housing 51 side, and a plurality of annular convex portions 34, which are arranged concentrically along the shape of central convex portion 33 and are convex on the housing 51 side. Furthermore, because first lens 11C in light source device 100H includes Fresnel lens surface 32, the overall thickness of the light source device can be reduced compared to light source device 100D. Therefore, when light source device 100H is used as a flash light source for a mobile phone, etc., the device thickness can be further reduced, thereby contributing to a thinner mobile phone.

[0124] In addition, in this embodiment, if Figure 17B As shown, the lower surface of first lens 11C exhibits a quadratic rotational symmetry when viewed from above. When the light source device of this embodiment is used as a camera flash light source, the lower surface of first lens 11C preferably exhibits a quadratic rotational symmetry when viewed from above, considering that the camera's shooting angle of view is rectangular, such as 16:9 or 4:3. It should be noted that the lower surface of first lens 11C may also exhibit a quadratic rotational symmetry when viewed from above.

[0125] In the light source device 100H, the positional relationship of the first lens 11C can be easily adjusted in conjunction with the position of the opening 52 , thereby suppressing deviation from the opening 52 and preventing deterioration in the appearance.

[0126] Example

[0127] Next, an optical simulation using the light source device model of the embodiment will be described. It should be noted that the light source device is not limited to the following embodiment.

[0128] Figure 18A 1 is a schematic diagram showing the lighting state of the light emitting devices in the light source device of the embodiment, and shows a state where all nine light emitting devices 1 a to 1 i are lighting. Figure 18B Yes Figure 18A Schematic diagram of the illumination distribution of the light source device. Figure 19A1 is a schematic diagram showing a lighting state of the light emitting devices in the light source device of the embodiment, and shows a state where eight light emitting devices 1a to 1d and 1f to 1i among the nine light emitting devices 1a to 1i are lighting. Figure 19B Yes Figure 19A Schematic diagram of the illumination distribution of the light source device. Figure 20A 1 is a schematic diagram showing the lighting state of the light emitting devices in the light source device of the embodiment, and shows a state where five light emitting devices 1a to 1c, 1f, and 1i among the nine light emitting devices 1a to 1i are lighting. Figure 20B Yes Figure 20A It should be noted that, in Figure 18A 、 Figure 19A and Figure 20A In the figure, the lighting state and the lighting state of the light-emitting device are simply shown in black and white.

[0129] based on Figure 1 The structure of the light source device 100 of the embodiment shown is simulated to determine how light from the light emitting devices 1 a to 1 i is irradiated through the first lens 11 and the second lens 31 .

[0130] In the model of light source device 100 in the embodiment, the light-emitting surface of each light-emitting device is assumed to be a square with a side of 0.5 mm. The light-emitting devices 1a to 1i, which are arranged in a rectangular shape when viewed from above, are arranged so that the center of the light-emitting surface of the nine light-emitting devices 1a to 1i (i.e., the center of the light-emitting surface of the light-emitting device 1e) is the origin, and the light-emitting devices 1a to 1i are arranged so that the coordinates are aligned with the following coordinates. The coordinate units are in mm.

[0131] Center of the light emitting surface of the light emitting device 1a: (-0.55, 0.55)

[0132] Center of the light-emitting surface of the light-emitting device 1b: (0, 0.55)

[0133] Center of the light-emitting surface of the light-emitting device 1c: (0.55, 0.55)

[0134] Center of the light-emitting surface of the light-emitting device 1d: (-0.55, 0)

[0135] Center of the light-emitting surface of the light-emitting device 1e: origin (0, 0)

[0136] Center of the light-emitting surface of the light-emitting device 1f: (0.55, 0)

[0137] Center of the light-emitting surface of the light-emitting device 1g: (-0.55, -0.55)

[0138] Center of the light-emitting surface of the light-emitting device 1h: (0, -0.55)

[0139] Center of the light-emitting surface of the light-emitting device 1i: (0.55, -0.55)

[0140] In the light source device 100 of the embodiment, as Figure 1 、 Figure 5 As shown, the first lens 11 has, on its lower surface, an incident portion 12 formed by a lower surface convex portion 14 arranged in the center of the lower surface in a plan view and having a square shape of 0.57 mm per side, and a corner portion 16 extending from the periphery of the lower surface convex portion 14 and having a square ring shape of 0.19 mm in width. A light guide portion 21 is formed by extending from the periphery of the corner portion 16 and having a square ring shape of 0.49 mm in width. Furthermore, on its upper surface, the first lens 11 has, on its upper surface, an upper surface convex portion 17 arranged in the center of the upper surface in a plan view and having a square shape of 0.71 mm per side, and a flat portion 19 extending from the upper surface convex portion 17 via an upper surface concave portion 18 extending from the upper surface convex portion 17 and having a square ring shape of 1.3 mm in width.

[0141] In the light source device 100 of the embodiment, as Figure 6 As shown, the second lens 31 has a Fresnel lens surface 32 on its lower surface. The second lens 31 includes a central convex portion 33, which is arranged in the center of the Fresnel lens surface 32 in a plan view and is formed into a circular shape with a radius of 0.45 mm; a convex portion 34, which has a vertex at a position with a radius of 1.5 mm, farthest from the center of the Fresnel lens surface and is arranged concentrically with the central convex portion 33; and a plurality of convex portions 34, which are arranged at equal intervals between the convex portion 34 and the central convex portion 33 and concentrically with the central convex portion 33. Furthermore, the upper surface of the second lens 31 includes a flat surface 36, which is formed into a circular shape with a radius of 1.77 mm in a plan view. It should be noted that in the light source device 100 of the embodiment, four convex portions 34 are assumed.

[0142] Using the light source device 100 model of the embodiment, the illuminance distribution when all or part of the light emitting devices 1 a to 1 i are turned on was obtained by simulation under the following measurement conditions.

[0143] (Measurement conditions)

[0144] Evaluation receiver dimensions: 280 x 370 mm

[0145] Distance between the light emitting device and the evaluation light receiver: 300 mm

[0146] Evaluation receiver viewing angle: 75 degrees

[0147] Distance between the top surface of the light-emitting device and the first lens: 0.1mm

[0148] like Figures 18A to 20BAs shown, it can be confirmed that the light source device 100 of the embodiment can obtain an illuminance distribution corresponding to the lighting position. In addition, it can be confirmed that the light source device 100 of the embodiment can increase the illuminance difference between the illuminance within the desired irradiation range and the illuminance outside the irradiation range when irradiating light to the desired irradiation range. It should be noted that in the light source device 100, because light is irradiated through the first lens 11 and the second lens 31, the light is irradiated in the direction corresponding to the refraction of the lenses.

[0149] It can also be confirmed that Figure 18A When all nine light-emitting devices 1a-1i are illuminated, adjusting the output of each light-emitting device can produce any desired illumination distribution within a limited power range. For example, if a brighter flashlight with a higher center illumination is desired, applying more power to the light-emitting device 1e located at the center of the rectangle can produce a brighter flashlight with higher center illumination. Furthermore, if uniform illumination is desired over a wide area, balancing the power applied to each light source can also produce a uniform illumination distribution. It should be noted that, typically, when the same power (same brightness) is applied to all light-emitting devices 1a-1i, the resulting illumination distribution is bright near the center of the rectangle, where the light-emitting devices are densely packed, and dark at the corners and ends. Therefore, a more uniform illumination distribution can be achieved by reducing the power applied to light-emitting device 1e located at the center of the rectangle and increasing the power applied to light-emitting devices 1a-1c, 1d, 1f, 1g-1i located at the corners and ends of the rectangle.

[0150] The various structures described above can be modified in various ways. For example, the number of corners 16 on the Fresnel lens surface of the first lens can be increased, or the curvature of the Fresnel lens surface can be appropriately modified. Furthermore, if the first lens is formed as a TIR lens surface, the lift angle of the corners 16 and the angle of the inclined surface can be appropriately modified. Furthermore, while the flat surfaces of each second lens are flush with the surface of the housing, a protective sheet can be attached to the flat surface to ensure that the sheet is flush with the housing.

[0151] Description of Reference Numerals

[0152] 1a, 1b, 1c, 1d, 1e, 1f, 1g, 1h, 1i light-emitting device; 2 light-emitting element; 3 electrode; 4 light-transmitting member; 5 covering member; 11, 11A, 11B, 11C first lens; 12 incident portion; 14 lower surface convex portion; 16 corner portion; 17 upper surface convex portion; 18 upper surface concave portion; 19 flat portion; 21 light-guiding portion; 22 inner side surface; 23 inclined surface; 24, 24A first main body portion; 25, 25A, 25B, 25C first side edge portion; 25a first upper region; 25b first foot region; 31, 3 1C, 31E second lens; 32 Fresnel lens surface; 33 central convex portion; 34 convex portion; 36 flat surface; 37 second main body portion; 38, 38C, 38E second side edge portion; 38a second foot area; 38b second mounting area; 41 substrate; 42 wiring; 51 housing; 51a lower surface of housing; 52 opening; 53 foot; 54 transparent component; 61 adhesive component; 62 conductive adhesive component; 100, 100A, 100B, 100C, 100D, 100E, 100F, 100G, 100H light source device.

Claims

1. A light source device, characterized in that: The invention comprises: a plurality of light-emitting devices capable of lighting independently, a first lens arranged opposite to the plurality of light-emitting devices, and a second lens arranged opposite to the first lens. The lower surface of the first lens facing the plurality of light emitting devices includes: an incident portion arranged in the center and into which light from the plurality of light emitting devices is incident; and a light guide portion arranged outside the incident portion and guiding the light incident from the incident portion. The lower surface of the second lens, which faces the first lens, has a Fresnel lens surface formed by a plurality of annular convex portions. The incident portion is a concave portion formed on the lower surface of the first lens. The lower surface of the first lens has a lower surface convex portion convex toward the light emitting device on the bottom surface of the concave portion. The upper surface of the first lens includes an upper surface convex portion arranged at the center and a flat portion arranged via an upper surface concave portion continuous with the upper surface convex portion.

2. The light source device according to claim 1, wherein The lower surface of the first lens has a four-fold rotational symmetric shape when viewed from above.

3. The light source device according to claim 2, wherein The lower surface of the first lens has a rectangular shape in a plan view.

4. The light source device according to any one of claims 1 to 3, wherein The plurality of light emitting devices are arranged in a rectangular shape as a whole in a plan view.

5. The light source device according to any one of claims 1 to 3, wherein The device further comprises: a substrate on which the plurality of light emitting devices are mounted, and a housing covering the second lens with the opening facing the second lens. The first lens is fixed to the substrate.

6. The light source device according to any one of claims 1 to 3, wherein: The device further comprises: a substrate on which the plurality of light emitting devices are mounted, and a housing covering the second lens with the opening facing the second lens. The second lens is fixed to the housing.

7. The light source device according to any one of claims 1 to 3, wherein: The device further comprises: a substrate on which the plurality of light emitting devices are mounted, and a housing covering the second lens with the opening facing the second lens. The first lens is fixed on the substrate, and the second lens is fixed on the housing.

8. The light source device according to claim 6, wherein The first lens includes a first main body portion including the incident portion and the light guide portion, and a first side edge portion extending laterally from an outer edge of the first main body portion. The second lens includes a second main body portion having the Fresnel lens surface and a flat surface opposite to the opening on a side opposite to the Fresnel lens surface, and a second side edge portion extending laterally from an outer edge of the second main body portion. The upper surface of the first side edge portion and the lower surface of the second side edge portion are fixed via an adhesive member.

Images