Light emitting module and cover structure

Abstract

To provide a light emitting module which enables reduction of stray light on a radiation surface, and to provide a cover structure.SOLUTION: A light emitting module includes: a light source; a lens which is disposed on the light source and transmits light from the light source; and a cover member disposed on the lens and including a lower surface into which light enters and an upper surface from which the light is emitted. The lower surface of the cover member includes: a first area which the light from the light source penetrating through the lens enters; and a second area which is provided around the first area and has light diffusivity higher than that of the first area. The upper surface of the cover member is covered with a translucent member having a hardness higher than that of the cover member.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a light emitting module and a cover structure. [Background technology]

[0002] Conventionally, light-emitting modules having semiconductor elements such as LEDs (Light Emitting Diodes) have been widely used. For example, Patent Document 1 discloses such a light-emitting module having a light source unit, a lens, and a cover member, in which a diffusion section consisting of a plurality of parallel grooves is formed in a part of the cover member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2015 / 125557 Summary of the Invention [Problem to be solved by the invention]

[0004] In a light-emitting module, it is required to reduce stray light on the illumination surface.

[0005] An object of the present disclosure is to provide a light-emitting module and a cover structure that reduce stray light on an illumination surface. [Means for solving the problem]

[0006] An optical emitting module according to one embodiment of the present disclosure includes a light source, a lens disposed on the light source and transmitting light from the light source, and a cover member disposed on the lens and including a lower surface through which the light is incident and an upper surface through which the light exits, the lower surface of the cover member including a first region through which light from the light source that has passed through the lens is incident, and a second region disposed around the first region and having a higher light diffusion property than the first region, and the upper surface of the cover member is covered with a translucent member having a harder property than the cover member.

[0007] A cover structure according to one embodiment of the present disclosure has a lens and a cover member disposed on the lens and including a lower surface and an upper surface, the lower surface of the cover member includes a first region and a second region disposed around the first region and having a higher light diffusion property than the first region, and the upper surface of the cover member is covered with a translucent member having a harder property than the cover member. Effect of the Invention

[0008] According to an embodiment of the present disclosure, it is possible to provide a light emitting module and a cover structure that reduce stray light on an irradiated surface. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a schematic top view illustrating an example of a light-emitting module according to the first embodiment. [Diagram 2] FIG. 2 is a schematic cross-sectional view taken along line II-II in FIG. [Diagram 3] 2 is a schematic top view showing an example of the configuration of a light source in the light emitting module according to the first embodiment. FIG. [Figure 4] FIG. 4 is a schematic cross-sectional view taken along line IV-IV in FIG. [Diagram 5] 2 is a schematic cross-sectional view taken along line II-II in FIG. 1, and is a first diagram illustrating the function of a cover member in the light-emitting module of FIG. [Figure 6] 6 is a schematic cross-sectional view taken along line VI-VI in FIG. 1, and is a second view showing the function of the cover member in the light-emitting module of FIG. [Figure 7] 13 is a schematic bottom view showing another example of the cover member. FIG. [Figure 8] 13 is a schematic bottom view showing a first example of a cover member included in the light-emitting module according to the second embodiment. FIG. [Figure 9] 13 is a schematic bottom view showing a second example of a cover member included in the light-emitting module according to the second embodiment. FIG. [Figure 10]FIG. 11 is a schematic cross-sectional view showing an example of a light-emitting module according to a third embodiment. [Figure 11] FIG. 11 is a schematic cross-sectional view showing an example of a light-emitting module according to a fourth embodiment. [Figure 12] FIG. 13 is a schematic cross-sectional view showing an example of a light-emitting module according to a fifth embodiment. [Figure 13] FIG. 13 is a schematic cross-sectional view showing an example of a light-emitting module according to a sixth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] The light-emitting module and the cover structure according to the embodiment of the present disclosure will be described in detail with reference to the drawings. However, the following embodiments are merely illustrative of the light-emitting module and the cover structure for embodying the technical idea of ​​the present embodiment, and are not limited to the following. Furthermore, the dimensions, materials, shapes, and relative arrangements of the components described in the embodiments are merely illustrative examples, and are not intended to limit the scope of the present disclosure, unless otherwise specified. The size, positional relationship, etc. of the components shown in each drawing may be exaggerated to clarify the explanation. In the following explanation, the same names and symbols indicate the same or similar components, and detailed explanations will be omitted as appropriate. An end view showing only the cut surface may be used as a cross-sectional view.

[0011] In the figures shown below, directions may be indicated by the X-axis, Y-axis, and Z-axis, but the X-axis, Y-axis, and Z-axis are mutually orthogonal directions. The X-direction along the X-axis and the Y-direction along the Y-axis indicate directions along the light-emitting surface of the light-emitting unit included in the light-emitting module according to the embodiment. The Z-direction along the Z-axis indicates a direction perpendicular to the light-emitting surface. In other words, the light-emitting surface of the light-emitting unit is parallel to the XY plane, and the Z-axis is perpendicular to the XY plane.

[0012] The direction in which the arrow points in the X direction is denoted as the +X side, and the opposite side of the +X side is denoted as the -X side, and the direction in which the arrow points in the Y direction is denoted as the +Y side, and the opposite side of the +Y side is denoted as the -Y side. The direction in which the arrow points in the Z direction is denoted as the +Z side, and the opposite side of the +Z side is denoted as the -Z side. In the embodiment, the light-emitting unit provided in the light-emitting module emits light to the +Z side, as an example. Furthermore, the term "top view" in the embodiment means viewing an object from the +Z side. However, these do not limit the orientation of the light-emitting module when it is used, and the orientation of the light-emitting module is arbitrary.

[0013] In addition, in this specification, the surface of an object when viewed from the +Z side is referred to as the "top surface," and the surface of an object when viewed from the -Z side is referred to as the "bottom surface." In the embodiments described below, "along the X-axis, Y-axis, and Z-axis" includes the object having a tilt within a range of ±10° with respect to these axes. In this embodiment, "orthogonal" may include an error within ±10° with respect to 90°.

[0014] In this specification or claims, when there are multiple elements and each element needs to be expressed separately, the elements may be distinguished by adding "first," "second," etc. to the beginning of the element. In addition, the objects to be distinguished may differ between this specification and the claims. Therefore, even if the claims describe an element with the same notation as this specification, the object identified by this element may not match between this specification and the claims.

[0015] For example, when there are elements distinguished by the notation "first", "second", and "third" in this specification, and the elements to which "first" and "third" are attached in this specification are described in the claims, or when the elements to which "first" is attached and the elements to which no specific ordinal number is attached are described in the claims, the elements may be distinguished by the notation "first" and "second" in the claims from the viewpoint of readability. In this case, the elements to which "first" and "second" are attached in the claims refer to the elements to which "first" and "third" are attached in this specification, or the elements to which no specific ordinal number is attached, respectively. Note that this rule is not limited to the application of elements, and can be applied rationally and flexibly to other objects as well.

[0016] [First embodiment] <Configuration Example of Light-Emitting Module According to First Embodiment> The configuration of the light emitting module according to the first embodiment will be described with reference to Fig. 1 and Fig. 2. Fig. 1 is a schematic top view showing an example of the light emitting module 100 according to the first embodiment. Fig. 2 is a schematic cross-sectional view taken along line II-II in Fig. 1. As an example, the light emitting module 100 is mounted on a smartphone and is a light emitting module for a flash in an imaging device provided on the smartphone. The imaging device includes a camera for taking still images and a video camera for taking videos.

[0017] The light emitting module 100 includes a light source 1, a lens 2 disposed on the light source 1 and transmitting light L from the light source 1, and a cover member 3 disposed on the lens 2 and including a lower surface 31d on which the light L is incident and an upper surface 31u from which the light L exits. The lower surface 31d of the cover member 3 includes a first region 311 on which the light L from the light source 1 that has passed through the lens 2 is incident, and a second region 312 provided around the first region 311 and having a higher light diffusion property than the first region 311. The upper surface 31u of the cover member 3 is covered with a light-transmitting member 4 having a higher hardness than the cover member 3.

[0018] In the example shown in FIG. 2, the second region 312 has a higher light diffusibility than the first region 311 because the lower surface 31d of the cover member 3 is a rough surface.

[0019] Of the light L emitted from the light source 1 and transmitted through the lens 2, light L2 that passes outside the effective outer edge G1 of the effective portion 21 of the lens 2 is diffused by the second region 312 of the cover member 3. As a result, in this embodiment, it is possible to provide a light-emitting module 100 that reduces stray light that is likely to be generated due to light L2 that passes outside the effective outer edge G1 of the effective portion 21, and reduces stray light on the irradiation surface.

[0020] Furthermore, in the light-emitting module 100, the upper surface 31u of the cover member 3 is covered with a light-transmitting member 4 having a harderness than the cover member 3. Therefore, for example, when the light-emitting module 100 is mounted on a smartphone and the upper surface 31u of the cover member 3 is exposed from the housing of the smartphone, damage to the upper surface 31u of the cover member 3 can be prevented and the chemical resistance, etc., of the upper surface 31u of the cover member 3 can be improved.

[0021] 1 and 2, the shape of the light emitting module 100 when viewed from above is substantially circular. However, the shape of the light emitting module 100 when viewed from above may be substantially rectangular, substantially elliptical, substantially polygonal, or the like.

[0022] The wiring board 5 is a plate-like member having a substantially circular shape when viewed from above. The wiring board 5 is a board having wiring on which the light source 1 and various electronic components can be mounted. The shape of the wiring board 5 when viewed from above may be substantially rectangular, substantially elliptical, substantially polygonal, or the like.

[0023] The light source 1 is disposed on the upper surface (surface on the +Z side) of the wiring board 5. The light source 1 has a light-emitting region 16 including at least one light-emitting surface 11. In the example shown in FIG. 1 and FIG. 2, the light source 1 includes nine light-emitting units 10 each having a light-emitting surface 11. The region including the multiple light-emitting surfaces 11 corresponds to the light-emitting region 16. When there is one light-emitting surface 11, the light-emitting region 16 is a region surrounded by the outer edge G2 of the light-emitting surface 11. When the light source 1 includes multiple light-emitting surfaces 11, the light-emitting region 16 is a region connecting the outer edges G2 of the light-emitting surfaces 11 located on the outer side in a top view. The light source 1 emits light L from the light-emitting surface 11 included in each of the multiple light-emitting units 10 in the direction where the lens 2 is located. The number of light-emitting units 10 included in the light source 1 is not limited to nine, and may be at least one.

[0024] The light-emitting module 100 may light up the multiple light-emitting units 10 individually or in groups. The light-emitting module 100 can increase the contrast of the irradiated light on the irradiation surface irradiated with the light L from the light source 1 by lighting up the multiple light-emitting units 10 individually or in groups at a desired brightness. Furthermore, the light-emitting module 100 can partially irradiate the irradiation surface by lighting up the multiple light-emitting units 10 individually or in groups. Here, partial irradiation refers to irradiating light to a partial area of ​​the irradiation surface.

[0025] In partial illumination, since light is irradiated to a part of the illumination surface, it is preferable that the outer edge of the illumination light is clear in order to make the light irradiating the desired area stand out. In other words, it is preferable that the illuminance difference of the illumination light is large between the desired area to be irradiated with light and the area other than the desired area. In other words, it is preferable that there is little stray light around the illumination light in the desired area to be irradiated with light on the illumination surface. In the light-emitting module 100, the stray light on the illumination surface is reduced to irradiate the light L to the desired area and reduce the light irradiated to the area other than the desired area. This increases the illuminance difference of the illumination light between the desired area to be irradiated with light and the area other than the desired area, making the light irradiating the desired area stand out.

[0026] When the light emitting module 100 is used as a light source for a flash of an imaging device, light can be emitted by switching between, for example, a wide-angle mode in which all the light emitting units 10 are caused to emit light, and a narrow-angle mode in which only the light emitting units 10 located near the center of the light emitting area 16 are caused to emit light, and the light emitting units 10 located near the outer edge G2 of the light emitting area 16 are not caused to emit light. The narrow-angle mode has a narrower light distribution angle than the wide-angle mode. Since the light emitting module 100 can switch the emitted light corresponding to the wide-angle mode and the narrow-angle mode, for example, light emitted from the light emitting module 100 can be used by the imaging device to take pictures according to the shooting mode, such as close-up or telephoto.

[0027] In the light emitting module 100, the light L from each of the multiple light emitting units 10 after passing through the lens 2 irradiates an area located on the opposite side of the position of each of the multiple light emitting units 10 with respect to the point P on the optical axis 20 of the lens 2 as the center. In this embodiment, the optical axis 20 of the lens 2 is the optical axis 20 of the effective portion 21. This makes it easier to grasp the relationship between the multiple light emitting units 10 and the irradiation position of the light emitting unit 10 on the irradiation surface irradiated with the light L from the light emitting module 100, and makes it easier to control the light. From another perspective, the light emitting module 100 makes it easier to partially irradiate the irradiation surface with light. Also, in the light emitting module 100, most of the light L from the light emitting unit 10 passes through the first convex surface 24 and the second convex surface 25 of the lens 2. Therefore, the light emitting module 100 can irradiate the light L from the light source 1 to a desired area using the first convex surface 24 and the second convex surface 25.

[0028] 2, the light-emitting module 100 includes a second region 312 that overlaps with an outer region of the effective portion 21 of the lens 2 in a top view. This makes it difficult for the effective outer edge G1 of the effective portion 21 and the region outside the effective outer edge G1 inside the light-emitting module 100 to be visually recognized from the outside of the light-emitting module 100. This can improve the aesthetic appearance of the light-emitting module 100.

[0029] (Lens 2) The lens 2 is an optical element disposed on the light source 1 and transmits the light L from the light source 1. In the example shown in FIG. 2, the lens 2 includes an effective portion 21, an outer lens portion 22, and a leg portion 23. The effective portion 21 is composed of a first convex surface 24 and a second convex surface 25. The first convex surface 24 protrudes in the direction (-Z side) where the light source 1 is located. The second convex surface 25 protrudes in the opposite direction (+Z side) from the direction where the light source 1 is located. The outer lens portion 22 is an annular portion provided outside the effective portion 21 in a top view. In this embodiment, the annular shape includes not only a round shape such as a ring, but also a shape that is closed and does not intersect with itself. The outer lens portion 22 is provided so as to protrude on the +Z side (hereinafter, sometimes referred to as upward) outside the effective portion 21 of the lens 2.

[0030] The leg portion 23 is an annular portion provided on the outside of the effective portion 21 in a top view. The leg portion 23 is provided so as to extend to the -Z side (hereinafter, sometimes referred to as downward) outside the effective portion 21 of the lens 2. The leg portion 23 is disposed on the upper surface of the wiring board 5 via an adhesive member or the like. The leg portion 23 supports the effective portion 21 and the outer lens portion 22 so that the effective portion 21 of the lens 2 is disposed above the light source 1 and the outer lens portion 22 is disposed outside the effective portion 21 in a top view.

[0031] In the example shown in FIG. 2, the outer lens unit 22 includes a plurality of concentric convex portions centered on the optical axis 20 of the lens 2 on the light exit surface, which is the upper surface of the lens 2. The concentric convex portions have a sawtooth or wavy shape. The concentric convex portions may have, for example, a Fresnel shape. The concentric convex portions of the outer lens unit 22, when viewed from above, reflect or refract light (stray light) that is emitted from the outer light-emitting unit 10 and heads toward the outside of the light-emitting module 100, thereby making it possible to use the light as irradiation light that is irradiated through the first region 311 of the cover member 3. In addition, the convex portions of the outer lens unit 22 compensate for the light-collecting performance of the lens 2, which decreases as it moves away from the optical axis 20 in a direction perpendicular to the optical axis 20. The light-emitting module 100 can reduce stray light by having the convex portions of the outer lens unit 22.

[0032] In the light emitting module 100, the lens 2 preferably includes a convex lens portion. The effective portion 21 of the lens 2 is configured as a biconvex single lens by the first convex surface 24 and the second convex surface 25. The light L from the light source 1 is once focused at a focal point F located at the center P by the first convex surface 24 and the second convex surface 25, and then irradiated onto the irradiation surface as diverging light. In the lens 2 including the convex lens, the focal point F is on the +Z side of the lens 2, and the light L from each light emitting unit 10 is gathered at the focal point F and then spreads. This makes it possible to reduce the light L irradiated from the light emitting module 100 being blocked by the housing of the smartphone, for example, when the light emitting module 100 is mounted on a smartphone or the like. Then, the light L from the light source 1 can be efficiently irradiated through the lens 2. However, lens 2 is not limited to a biconvex single lens, and may be in other forms such as a plano-convex single lens, a biconcave single lens, a plano-concave single lens, a Fresnel lens, a lens assembly consisting of multiple lenses, an array lens, a meniscus single lens, an aspheric lens, a cylindrical lens, etc.

[0033] The shape of the lens 2 when viewed from above is substantially circular. However, the shape of the lens 2 when viewed from above may be substantially rectangular, substantially elliptical, substantially polygonal, or the like. The shape of the lens 2 when viewed from above may be rotationally symmetric. Considering that the shooting range of a typical imaging device is substantially rectangular, it is preferable that the shape of the lens 2 when viewed from above is a four-fold rotationally symmetric shape or a two-fold rotationally symmetric shape. In the lens 2, the size of the radii of curvature of the first convex surface 24 and the second convex surface 25, the magnitude relationship between the radii of curvature, the thickness of the lens, and the like can also be appropriately changed.

[0034] The lens 2 is translucent to the light emitted by the light source 1, and is made of at least one of a resin material such as polycarbonate resin, acrylic resin, silicone resin, and epoxy resin, or a glass material. In the example shown in Fig. 2, the effective portion 21, the outer lens portion 22, and the leg portion 23 are connected to each other as an integrated member. The translucency of the lens 2 refers to the property of being able to transmit 60% or more of the light L from the light source 1.

[0035] (Cover member 3) 2, the cover member 3 includes a cover portion 31 and a support portion 32. In the cover member 3, the support portion 32 is provided around the entire outer edge of the cover portion 31 in a top view. The lower surface 31d of the cover member 3 refers to the lower surface of the cover portion 31. The upper surface 31u of the cover member 3 refers to the upper surface of the cover portion 31 and the upper surface of the support portion 32. The cover portion 31 and the support portion 32 are integrally molded.

[0036] In the example shown in FIG. 2, the cover portion 31 is disposed on the lens 2 so as to overlap the light source 1 and the lens 2 in a top view. The support portion 32 is provided so as to extend downward from the outer edge of the cover portion 31. The support portion 32 is disposed on the side surface of the wiring board 5 via an adhesive member or the like so that the side surface of the support portion 32 faces the side surface of the wiring board 5. The support portion 32 supports the cover portion 31 so that the cover portion 31 is disposed above the lens 2. In the example shown in FIG. 1, the shape of the cover member 3 in a top view is substantially circular. However, the shape of the cover member 3 in a top view may be substantially rectangular, substantially elliptical, substantially polygonal, or the like.

[0037] The lower surface 31d of the cover member 3 includes, in a top view, a first region 311 and a second region 312 surrounding the entire periphery of the first region 311. The inner edge of the second region 312 is in contact with the outer edge of the first region 311. The second region 312 is an area indicated by dot hatching in FIG.

[0038] The shape of the outer edge of the first region 311 is substantially circular in top view. The shapes of the inner edge and the outer edge of the second region 312 are substantially circular in top view. In other words, the second region 312 is an annular region. That is, the first region 311 is disposed inside the annular second region 312 in top view. The annular second region 312 overlaps with a plurality of concentric convex portions of the outer lens portion 22. In the example shown in FIG. 1 and FIG. 2, the center Q of the first region 311, the optical axis 20 of the lens 2, and the center C of the light source 1 (the center of the light emitting unit 10) overlap in top view. However, the shapes of the inner edge and the outer edge of the second region 312 may be different in top view, and may be substantially rectangular, substantially elliptical, or substantially polygonal, etc.

[0039] In the light-emitting module 100, the lower surface 31d of the cover member 3 in the second region 312 is provided with at least one of a rough surface and one or more convex portions. In the example shown in FIG. 2, the lower surface 31d of the cover member 3 in the second region 312 is provided with a rough surface. On the other hand, in the first region 311, the lower surface 31d of the cover member 3 is a flat surface that is not a rough surface. The flat surface preferably has an arithmetic mean roughness Ra of less than 0.3 μm, more preferably 0.2 μm or less. The rough surface preferably has an arithmetic mean roughness Ra of 0.3 μm or more and 2.0 μm or less, more preferably 0.5 μm or more and 1.5 μm or less. The rough surface can be formed by blasting, laser processing, molding, or the like. Alternatively, the rough surface may be a glass surface state before polishing treatment that is used without polishing treatment. At least one of a rough surface and one or more convex portions is provided on the lower surface 31d of the cover member 3 in the second region 312, so that the second region 312 has higher light diffusion properties than the first region 311. The first region 311 preferably has lower light diffusion properties than the second region 312, and has almost no light diffusion properties. As a result, light L from the light source 1 that enters the second region 312, i.e., light that becomes stray light, is diffused and is emitted from the upper surface 31u of the cover member 3 that overlaps with the second region 312 in a top view. As a result, the light that passes through the second region 312 is made less noticeable, and the light that passes through the inside of the first region 311 in a top view can be made more noticeable.

[0040] In the light-emitting module 100, the light diffusing property of the second region 312 can also be imparted by disposing a light diffusing material on the lower surface 31d of the cover member 3 in the second region 312. Examples of the light diffusing material that can be used include titanium oxide, barium titanate, aluminum oxide, and silicon oxide. The light diffusing material on the lower surface 31d of the cover member 3 can be disposed, for example, by applying a resin containing the light diffusing material to the lower surface 31d or by attaching a plate-shaped member containing the light diffusing material to the lower surface 31d.

[0041] In addition, in the light-emitting module 100, the light diffusing property of the second region 312 can also be imparted by including a light diffusing material inside the cover member 3 that overlaps the second region 312 in a top view.

[0042] Furthermore, in the light-emitting module 100, a light diffusing material can be disposed in a region overlapping with the second region 312 of the upper surface 31u of the cover member 3 in a top view. For example, in the light-emitting module 100, a light diffusing material is disposed in a desired region of the upper surface 31u of the cover member 3 by inkjet printing or the like.

[0043] The cover member 3 is made of at least one of a resin material, such as polycarbonate, acrylic, silicone, epoxy, or a glass material, which is translucent to the light emitted by the multiple light emitting units 10. Note that the translucency of the first region 311 and the second region 312 of the cover member 3 refers to the property of transmitting 60% or more of the light L from the light source 1.

[0044] 1 and 2, the support portion 32 is a cylindrical portion having a substantially circular shape when viewed from above. However, the shape of the support portion 32 when viewed from above may be a substantially elliptical or substantially polygonal shape, etc.

[0045] (Translucent member 4) The light-transmitting member 4 is a member for protecting the upper surface 31u of the cover member 3. The light-transmitting member 4 has light-transmitting properties and transmits light that enters the lower surface 31d of the cover member 3 from the first region 311 and the second region 312 and exits from the upper surface 31u of the cover member 3. The light-transmitting member 4 has almost no effect on the light-transmitting properties and light-diffusing properties of the first region 311 and the second region 312. The light-transmitting member 4 is made of a resin material such as polycarbonate resin, acrylic resin, silicone resin, epoxy resin, urethane resin, or a glass material, and is made of a material that is harder than the cover member 3. The light-transmitting member 4 may contain an appropriate amount of a light-diffusing material such as silicon dioxide or aluminum oxide, as long as the light-diffusing properties of the second region 312 are higher than that of the first region 311. The light-transmitting properties here are preferably such that 60% or more of the light from the light-emitting element 12 is transmitted. The thickness of the light-transmitting member 4 is preferably 0.1 μm or more and 100 μm or less from the viewpoint of protective strength.

[0046] The light-transmitting member 4 can be disposed on the cover member 3 by spraying, potting, sputtering, atomic layer deposition (ALD), or the like. By using the atomic layer deposition method, the film thickness can be controlled at the atomic layer level, and a flat and dense light-transmitting member 4 can be disposed on the cover member 3. It is also possible to dispose the light-transmitting member 4 that has been molded separately on the cover member 3 by using an adhesive such as resin.

[0047] If the upper surface of the cover member has a second region including a rough surface or one or more convex portions, and the light-transmitting member and the second region of the upper surface of the cover member are placed in contact with each other, the light-transmitting member will bury the rough surface or one or more convex portions of the upper surface of the cover member. As a result, the light diffusion function using the surface shape of the second region cannot be effectively utilized, and the light diffusion property of the second region is significantly reduced. Therefore, in the embodiment of the present disclosure, by covering the upper surface side of the cover member 3 with the light-transmitting member 4, damage to the upper surface 31u of the cover member 3 is prevented, and the chemical resistance of the upper surface 31u of the cover member 3 is improved, while the first region 311 and the second region 312 are placed on the lower surface of the cover member 3, and stray light of the light L emitted from the light source 1 can be effectively reduced.

[0048] In this embodiment, a structure including the lens 2, the cover member 3, and the light-transmitting member 4 is referred to as a cover structure 7. The cover structure 7 has a cover member 3 that is disposed on the lens 2 and includes a lower surface 31d and an upper surface 31u. The lower surface 31d of the cover member 3 includes a first region 311 and a second region 312 that is provided around the first region 311 and has higher light diffusion properties than the first region 311. The upper surface 31u of the cover member 3 is covered with a light-transmitting member 4 that is harder than the cover member 3.

[0049] The light-emitting module 100 of this embodiment includes a cover structure 7. In this embodiment, the cover structure 7 is arranged on the upper surface of the wiring board 5 via an adhesive member or the like, and the side of the support portion 32 of the cover member 3 faces the side of the wiring board 5 via an adhesive member or the like, so that the positions of the lens 2 and the cover member 3 are fixed. That is, in the cover structure of this embodiment, the positions of the lens 2 and the cover member 3 are fixed via another member in a state in which the lens 2 and the cover member 3 are not directly or indirectly joined. The lens 2 and the cover member 3 may be directly or indirectly joined. For example, even when the positions of the lens 2 and the cover member 3 are fixed by direct joining or joining via an adhesive member or the like, the structure including the lens 2, the cover member 3, and the light-transmitting member 4 is the cover structure 7.

[0050] (Light source 1) 3 and 4, the configuration of the light source 1 in the light emitting module 100 will be described in detail. Fig. 3 is a schematic top view showing an example of the configuration of the light source 1. Fig. 4 is a schematic cross-sectional view taken along line IV-IV in Fig. 3.

[0051] 3, the light source 1 includes a plurality of light-emitting units 10, each of which includes a light-emitting surface 11. Each of the plurality of light-emitting units 10 emits light from the light-emitting surface 11 toward a lens 2 provided above the light source 1. The light-emitting surface 11 refers to the main light extraction surface of the light-emitting unit 10.

[0052] In the example shown in FIG. 3, the light source 1 has a plurality of light-emitting units 10 arranged vertically, horizontally, or in a matrix in a top view. The light source 1 also includes nine light-emitting units 10, namely, light-emitting units 10-1, 10-2, 10-3, 10-4, 10-5, 10-6, 10-7, 10-8, and 10-9. The nine light-emitting units 10 correspond to the plurality of light-emitting units. The plurality of light-emitting units 10 are arranged along the X direction, or along the X direction and the Y direction. In FIG. 3, the nine light-emitting units 10 are arranged along the X direction and the Y direction.

[0053] The nine light-emitting units 10 include nine corresponding light-emitting surfaces 11. That is, the light-emitting unit 10-1 includes a light-emitting surface 11-1, the light-emitting unit 10-2 includes a light-emitting surface 11-2, the light-emitting unit 10-3 includes a light-emitting surface 11-3, the light-emitting unit 10-4 includes a light-emitting surface 11-4, and the light-emitting unit 10-5 includes a light-emitting surface 11-5. The light-emitting unit 10-6 includes a light-emitting surface 11-6, the light-emitting unit 10-7 includes a light-emitting surface 11-7, the light-emitting unit 10-8 includes a light-emitting surface 11-8, and the light-emitting unit 10-9 includes a light-emitting surface 11-9. The light-emitting surfaces 11-1 to 11-9 are preferably disposed inside the lens 2 (inside the outer shape of the lens 2) in a top view, and more preferably disposed inside the effective unit 21. Since the light-emitting unit 10 and the light-emitting surface 11 overlap in a top view, the reference numerals of the light-emitting unit 10 and the light-emitting surface 11 are both shown in FIG. 3. In the following description, when two or more items substantially coincide or overlap, the symbols may be written together.

[0054] In the example shown in FIG. 3, the shape of the light-emitting surface 11 in top view is substantially rectangular. The first width Wx represents the width of the light-emitting surface 11 along the X direction. The second width Wy represents the width of the light-emitting surface 11 along the Y direction. The first width Wx and the second width Wy are, for example, 50 μm or more and 2000 μm or less, and preferably 200 μm or more and 1000 μm or less. The first width Wx and the second width Wy may be substantially equal to each other, but may be different. In this embodiment, the light-emitting surfaces 11 of adjacent light-emitting units 10 are arranged at a predetermined interval when viewed from the top. The first light-emitting surface interval dx in the X direction and the second light-emitting surface interval dy in the Y direction correspond to the predetermined intervals, respectively. From the viewpoint of the light-emitting characteristics of the light-emitting module 100, it is preferable that the first light-emitting surface interval dx and the second light-emitting surface interval dy are narrower. However, there is a limit to the interval at which multiple light-emitting units 10 can be mounted. In order to obtain good light emitting characteristics and an interval that allows mounting of a plurality of light emitting units 10, it is preferable that the first light emitting surface interval dx and the second light emitting surface interval dy are both 10 μm or more and 50 μm or less. However, the shape of the light emitting surface 11 when viewed from above may be substantially circular or substantially elliptical, or may be a polygon such as a substantially triangular or substantially hexagonal shape.

[0055] (Light emitting unit 10) As shown in FIG. 4, the light-emitting unit 10-1 is disposed on the +Z side of the wiring board 5, with the upper surface being the light-emitting surface 11-1 and the surface opposite to the light-emitting surface 11-1 being the mounting surface. The light-emitting unit 10-1 has a light-emitting element 12, a wavelength conversion member 14 provided on the light-emitting element 12, and a light-shielding member 15 that covers the side surfaces of the light-emitting element 12 and the wavelength conversion member 14 except for the upper surface of the wavelength conversion member 14. In other words, each of the side surfaces of the light-emitting element 12 and the wavelength conversion member 14 is covered by the light-shielding member 15. This configuration reduces the amount of light leaking from the side surfaces of the light-emitting element 12 and the wavelength conversion member 14, so that the light from the light source 1 can be irradiated to a desired area.

[0056] The light source 1 includes a plurality of light-emitting sections 10, and the light-shielding members 15 of adjacent light-emitting sections 10 are continuous with each other. In other words, the light-shielding members 15 integrally hold the plurality of light-emitting elements 12 and the plurality of wavelength conversion members 14. This configuration makes it possible to collectively mount the plurality of light-emitting sections 10 and to narrow the distance between each of the light-emitting surfaces 11.

[0057] 3, the light source 1 includes a plurality of light-emitting units 10, and the light-emitting surfaces 11 of the adjacent light-emitting units 10 are separated by a light-shielding member 15, but the adjacent light-emitting surfaces 11 may be continuous with each other. For example, one wavelength conversion member 14 may cover all of the plurality of light-emitting elements 12. In this case, the first light-emitting surface interval dx and the second light-emitting surface interval dy are zero.

[0058] The light emitting element 12 has at least a pair of positive and negative electrodes 13 on the surface opposite to the light emitting surface 11-1 (that is, the lower surface).

[0059] The light emitting element 12 preferably includes various semiconductors such as III-V group compound semiconductors and II-VI group compound semiconductors. X Al Y Ga 1-X-Y It is preferable to use a nitride-based semiconductor such as InN (0≦X, 0≦Y, X+Y≦1), and InN, AlN, GaN, InGaN, AlGaN, InGaAlN, etc. can also be used. The light-emitting element 12 is, for example, an LED or an LD (Laser Diode). From the viewpoints of luminous efficiency and excitation of the wavelength conversion substance, the emission peak wavelength of the light-emitting element 12 is preferably 400 nm or more and 530 nm or less, more preferably 420 nm or more and 490 nm or less, and even more preferably 450 nm or more and 475 nm or less.

[0060] The wavelength conversion member 14 is, for example, a substantially rectangular member when viewed from above. The wavelength conversion member 14 is provided so as to cover the upper surface of the light emitting element 12. The wavelength conversion member 14 includes a wavelength conversion material that converts the wavelength of at least a part of the light from the light emitting element 12. The wavelength conversion member 14 can be formed using a light-transmitting resin material or an inorganic material such as ceramics or glass. As the resin material, a thermosetting resin such as a silicone resin, a silicone-modified resin, an epoxy resin, an epoxy-modified resin, or a phenolic resin can be used. In particular, a silicone resin or a modified resin thereof that has excellent light resistance and heat resistance is preferable. Note that the light transmittance here preferably means that 60% or more of the light from the light emitting element 12 is transmitted. In addition, the wavelength conversion member 14 can be a thermoplastic resin such as a polycarbonate resin, an acrylic resin, a methylpentene resin, or a polynorbornene resin. Furthermore, the wavelength conversion member 14 may include the above-mentioned light diffusing material in the above-mentioned resin. For example, the wavelength conversion member 14 may be a resin material, ceramics, glass, or the like containing a wavelength conversion substance, a sintered body of a wavelength conversion substance, etc. Furthermore, the wavelength conversion member 14 may be a multi-layer member in which a resin layer containing a wavelength conversion substance or a light diffusing substance is disposed on the ±Z side surfaces of a molded body of resin, ceramics, glass, or the like.

[0061] The wavelength converting material contained in the wavelength converting member 14 is, for example, an yttrium-aluminum-garnet phosphor (e.g., (Y,Gd)3(Al,Ga)5O 12 :Ce), lutetium aluminum garnet phosphors (e.g., Lu3(Al,Ga)5O 12 :Ce), terbium aluminum garnet phosphors (e.g., Tb3(Al,Ga)5O 12 :Ce), CCA phosphors (e.g., Ca 10 (PO4)6Cl2:Eu), SAE phosphors (e.g., Sr4Al 14 O 25 :Eu), chlorosilicate phosphors (e.g., Ca8MgSi4O 16(Cl2:Eu), silicate phosphors (e.g., (Ba,Sr,Ca,Mg)2SiO4:Eu), β-sialon phosphors (e.g., (Si,Al)3(O,N)4:Eu) or α-sialon phosphors (e.g., Ca(Si,Al) 12 (O,N) 16 :Eu), etc., oxynitride phosphors, LSN phosphors (e.g., (La,Y)3Si6N 11 :Ce), BSESN phosphors (e.g., (Ba,Sr)2Si5N8:Eu), SLA phosphors (e.g., SrLiAl3N4:Eu), CASN phosphors (e.g., CaAlSiN3:Eu) or SCASN phosphors (e.g., (Sr,Ca)AlSiN3:Eu), etc., nitride phosphors, KSF phosphors (e.g., K2SiF6:Mn), KSAF phosphors (e.g., K2(Si 1-x Al x )F 6-x :Mn where x satisfies 0 < x < 1), or fluoride phosphors such as MGF phosphors (e.g., 3.5MgO·0.5MgF2·GeO2:Mn), quantum dots having a perovskite structure (e.g., (Cs,FA,MA)(Pb,Sn)(F,Cl,Br,I)3 where FA and MA represent formamidinium and methylammonium, respectively), II-VI group quantum dots (e.g., CdSe), III-V group quantum dots (e.g., InP), or quantum dots having a chalcopyrite structure (e.g., (Ag,Cu)(In,Ga)(S,Se)2), etc. can be used. The above wavelength conversion materials are particles. Also, one of these wavelength conversion materials can be used alone, or two or more of these wavelength conversion materials can be combined and used.

[0062] In the light emitting module 100, a blue light emitting element is used as the light emitting element 12, and the wavelength conversion member 14 includes a wavelength conversion material that wavelength-converts the light emitted from the light emitting element 12 into yellow, thereby emitting white light.

[0063] The light shielding member 15 is a member that covers the side surfaces of the light emitting element 12 and the wavelength conversion member 14. The light shielding member 15 directly or indirectly covers the side surfaces of the light emitting element 12 and the wavelength conversion member 14. The upper surface of the wavelength conversion member 14 is exposed from the light shielding member 15 and is the light emitting surface 11-1 of the light emitting unit 10-1. The light shielding member 15 may be spaced apart between adjacent light emitting units among the multiple light emitting units 10. The light shielding member 15 is preferably made of a member with high light reflectance in order to improve the light extraction efficiency. For example, a resin material containing a light reflective substance such as a white pigment can be used for the light shielding member 15.

[0064] Examples of light-reflecting substances include titanium oxide, 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 oxide, etc., and it is preferable to use one of these alone or two or more of these in combination. In addition, as the resin material, it is preferable to use a resin material containing a thermosetting resin such as an epoxy resin, an epoxy-modified resin, a silicone resin, a silicone-modified resin, or a phenolic resin as the main component.

[0065] The light-emitting unit 10 is electrically connected to wiring 51 provided on the wiring board 5. The wiring board 5 has wiring 51 on its surface. The wiring board 5 may have wiring 51 inside. The light-emitting unit 10 and the wiring board 5 are electrically connected by connecting the wiring 51 of the wiring board 5 to at least a pair of positive and negative electrodes 13 of the light-emitting unit 10 via a conductive member 52.

[0066] The wiring board 5 preferably uses an insulating material as a base material, and preferably uses a material that is difficult to transmit light emitted from the light emitting unit 10 and external light. In addition, the wiring board 5 preferably uses a material having a certain strength. Specifically, the wiring board 5 can be formed using ceramics such as alumina, aluminum nitride, mullite, and silicon nitride, and resins such as phenol resin, epoxy resin, polyimide resin, BT resin (bismaleimide triazine resin), polyphthalamide, and polyester resin as a base material.

[0067] The wiring 51 can be made of at least one of copper, iron, nickel, tungsten, chromium, aluminum, silver, gold, titanium, palladium, rhodium, alloys of these, etc. In addition, a layer of silver, platinum, aluminum, rhodium, gold, alloys of these, etc. may be provided on the surface layer of the wiring 51 from the viewpoint of wettability and / or light reflectivity of the conductive member 52, etc.

[0068] <Main function of cover member 3> The function of the cover member 3 in the light-emitting module 100 will be described with reference to Fig. 5 and Fig. 6. Fig. 5 is a schematic cross-sectional view taken along line II-II in Fig. 1, and is a first diagram showing the function of the cover member 3 in the light-emitting module 100. Fig. 6 is a schematic cross-sectional view taken along line VI-VI in Fig. 1, and is a second diagram showing the function of the cover member 3 in the light-emitting module 100.

[0069] 5, the first light L3 indicated by a solid line indicates light that is emitted from the light source 1, passes near the center of the effective portion 21 of the lens 2, and then passes through the first region 311 of the cover member 3. The second light L4 indicated by a dashed line indicates light that is emitted from the light source 1, passes inside the effective outer edge G1 of the effective portion 21 of the lens 2, and then passes through the second region 312 of the cover member 3.

[0070] As shown in FIG. 5, the second light L4 is diffused by the second region 312, and thus stray light resulting from light passing inside the effective outer edge G1 of the effective portion 21 of the lens 2 or light passing through the outer lens portion 22 is reduced. As a result, in the light emitting module 100, the stray light contained in the light emitted from the light emitting module 100 can be reduced. Then, the light can be emitted to a desired region, and the light irradiated to a region other than the desired region can be reduced. In addition, by providing the second region 312 so as to overlap the multiple concentric convex portions of the outer lens portion 22 in a top view, when the light emitting module 100 is viewed from the +Z side of the upper surface 31u of the cover member 3, the multiple concentric convex portions are less likely to be visible. As a result, the aesthetic appearance of the light emitting module 100 can be improved.

[0071] As shown in FIG. 3, in the light-emitting module 100, the light source 1 has a light-emitting region 16 including nine light-emitting surfaces 11. As shown in FIG. 6, the focal length of the lens 2 is f, and the shortest distance from the focal point F of the lens 2 on the optical axis 20 of the lens 2 to the lower surface 31d of the cover member 3 is d. As shown in FIG. 3, the longest distance from the center C of the light-emitting region 16 to the outer edge G2 of the light-emitting region 16 in the direction along the light-emitting surface 11 is D. In the example shown in FIG. 3 and FIG. 6, nine light-emitting units 10 are arranged in a 3×3 matrix, and the light-emitting region 16 is approximately square. Therefore, the longest distance D is the distance from the center C of the central (second row, second column) light-emitting unit 10 to the corner of the square in the outer edge G2 of the light-emitting region 16. The maximum width W of the first region 311 in the direction along the lower surface 31d of the cover member 3 is expressed by the following formula. W ≥ 2 × D × d / f

[0072] In addition, the shortest distance d from the focus F of the lens 2 to the lower surface 31d of the cover member 3 on the optical axis 20 of the lens 2 is, in other words, the distance from the focus F of the lens 2 to the lower surface 31d on a straight line connecting the focus F of the lens 2 to the center C of the light-emitting area 16.

[0073] With the above configuration, stray light originating from light that has passed through the outer lens portion 22 of the lens 2 or light that has passed near the effective outer edge G1 of the effective portion 21 is reduced by the light diffusion effect of the second region 312. As a result, in the light emitting module 100, the stray light contained in the light emitted from the light emitting module 100 can be reduced. Then, the light can be irradiated to a desired region, and the light irradiated to a region other than the desired region can be reduced. In addition, the first light L1 emitted from the light source 1 and passed through the effective portion 21 of the lens 2 passes inside the first region 311 of the cover member 3, so that it is less susceptible to the effect of light diffusion in the cover member 3, and the light can be irradiated to a desired region.

[0074] (Another example of the cover member 3) FIG. 7 is a schematic bottom view showing another example of the cover member 3. In the example shown in FIG. 7, a plurality of convex portions 61 are provided on the bottom surface 31d of the cover member 3 in the second region 312. In the example shown in FIG. 7, the plurality of convex portions 61 are arranged in a concentric shape at approximately equal intervals with the center Q of the first region 311 as the center. The plurality of convex portions 61 have a sawtooth or wavy shape. The plurality of concentric convex portions may have a Fresnel shape, for example. In the example shown in FIG. 7, the plurality of convex portions 61 includes four convex portions 61, but the number of the plurality of convex portions 61 can be changed as appropriate. For example, the light diffusion property of the second region can be adjusted by increasing the number of the plurality of convex portions 61 to increase the light diffusion property, or by decreasing the number of the plurality of convex portions 61 to decrease the light diffusion property. In addition, when the convex portions 61 have an inclined surface with respect to the optical axis 20 of the lens 2, the inclination angle of the inclined surface may be adjusted. In this embodiment, the inclined surface refers to a surface including a plane or a curved surface having an inclination angle with respect to the optical axis 20 in a cross-sectional view of the cover member 3 along the optical axis 20 of the lens 2. The convex portion 61 may have, for example, a Fresnel shape. In addition, at least one convex portion 61 may be provided on the lower surface 31d of the cover member 3 in the second region 312, and may have one spiral convex portion 61 surrounding the entire circumference of the first region 311 in a top view. The spiral convex portion 61 includes a curve that moves away from the center Q of the first region 311 as it turns in a top view. One spiral convex portion 61 has a sawtooth or wave-like shape in a cross-sectional view along the Z axis passing through the center Q of the first region 311. Even when the light emitting module 100 has a convex portion 61 on the lower surface 31d of the cover member 3 in the second region 312, the same effect can be obtained as when the lower surface 31d of the cover member 3 in the second region 312 has a rough surface.

[0075] [Second embodiment] Next, a light-emitting module according to a second embodiment will be described. Note that the same names and symbols as those in the already described embodiments indicate the same or similar members or configurations, and detailed descriptions will be omitted as appropriate. This also applies to the following embodiments.

[0076] FIG. 8 is a schematic bottom view showing a first example of a cover member 3a included in the light-emitting module according to the second embodiment.

[0077] The light emitting module according to the second embodiment differs from the first embodiment in that the second region 312 in the cover member 3a has higher light diffusibility from the inside to the outside of the second region 312 in top view.

[0078] In a first example shown in FIG. 8, a plurality of protrusions 61 are provided on the lower surface 31d of the cover member 3a in the second region 312. The plurality of protrusions 61 are arranged in a concentric manner with the center Q of the first region 311 as the center. The first interval p1 is the interval between adjacent protrusions 61 in the radial direction of the concentric circles. In the plurality of protrusions 61, the first interval p1 gradually narrows from the inside to the outside of the second region 312 in a top view. In the example shown in FIG. 8, the first interval p1 includes first intervals p11 and p12. The first interval p12 is located outside the first interval p11 in a top view. The first interval p12 is narrower than the first interval p11. When viewed from above, the first interval p1 gradually becomes narrower from the inside to the outside of the second region 312, so that the second region 312 in the cover member 3a has gradually higher light diffusion properties from the inside to the outside of the second region 312.

[0079] In the light emitting module according to the second embodiment, the boundary between the first region 311 and the second region 312 in the cover member 3a can be made unclear (blurred) by increasing the light diffusibility of the second region 312 from the inside to the outside of the second region 312 in top view. This improves the aesthetic appearance of the cover member 3a, and can improve the aesthetic appearance of the light emitting module according to the second embodiment.

[0080] Also, for example, in the manufacturing process of the light emitting module, if an error occurs in the components of the light emitting module, or if there is a misalignment between the optical axis of the lens and the center of the light emitting region, a part of the light contributing to partial illumination may pass through the second region close to the first region. In this case, in the light emitting module according to the second embodiment, the light diffusion of the second region 312 close to the first region 311 is lower than the light diffusion of the second region 312 far from the first region 311, so that the optical loss due to light diffusion can be reduced. In the first example shown in FIG. 8, the multiple convex portions 61 include eight convex portions 61, but the number of the multiple convex portions 61 can be changed as appropriate.

[0081] FIG. 9 is a schematic bottom view showing a second example of the cover member 3a included in the light emitting module according to the second embodiment.

[0082] The second example shown in FIG. 9 is different from the first example in that the multiple protrusions 61 are arranged radially around the center Q of the first region 311. The second interval p2 is the interval between adjacent protrusions 61 in the circumferential direction of the circular ring-shaped second region 312. In the multiple protrusions 61, the second interval p2 gradually narrows from the inside to the outside of the second region 312 in a top view. In the example shown in FIG. 9, the second interval p2 includes second intervals p21 and p22. The second interval p22 is located outside the second interval p21 in a top view. The second interval p22 is narrower than the second interval p21. Since the second interval p2 narrows from the inside to the outside of the second region 312 in a top view, the second region 312 in the cover member 3a has higher light diffusion properties from the inside to the outside.

[0083] In the configuration of the second example in which the multiple protrusions 61 are radially arranged around the center Q of the first region 311, the same effect as in the first example can be obtained by increasing the light diffusion property of the second region 312 from the inside to the outside of the second region 312 in a top view. The number of the multiple protrusions 61 can be changed as appropriate.

[0084] In addition, in the light-emitting module of the second embodiment, when viewed from above, the surface roughness of the rough surface provided in the second region 312 of the cover member 3a can be made rougher from the inside to the outside of the second region 312, thereby increasing the light diffusion property of the second region 312.

[0085] The effects and advantages of the light emitting module according to the second embodiment other than those described above are similar to those of the first embodiment.

[0086] [Third embodiment] Next, a light emitting module according to a third embodiment will be described.

[0087] <Configuration Example of Light-Emitting Module According to Third Embodiment> Fig. 10 is a schematic cross-sectional view showing an example of a light-emitting module 100b according to the third embodiment. A top view of the light-emitting module 100b is similar to Fig. 1 except for the shape of the lens 2. The schematic cross-sectional view of Fig. 10 shows a cross section of the light-emitting module 100b corresponding to the line II-II in Fig. 1, and the same applies to the cross-sectional views of Figs. 11 to 13 shown below.

[0088] The light emitting module 100b further includes a support portion 32b that supports the cover member 3. The cover member 3 and the support portion 32b constitute a molded body directly bonded at their respective interfaces. The cover member 3 has light transmissivity. The support portion 32b has light blocking properties. In the light emitting module 100b, the outer lens portion 22 includes a plurality of concentric convex portions centered on the optical axis 20 of the lens 2 on the light incident surface, which is the lower surface of the lens 2. The plurality of concentric convex portions provided on the light incident surface of the outer lens portion 22 have a sawtooth or wavy shape. The plurality of concentric convex portions may have, for example, a Fresnel shape. In the example shown in FIG. 10, in the top view, the plurality of concentric convex portions provided on the light exit surface of the outer lens portion 22 overlap with the plurality of concentric convex portions provided on the light incident surface of the outer lens portion 22. The light emitting module 100b differs from the first embodiment in these respects. In this embodiment, the molded body directly bonded at each interface is, for example, a two-color molded body. The two-color molded body means a structure manufactured by a two-color molding process. The multiple convex portions in the concentric circle shape of the outer lens portion 22 can be provided on at least one of the light entrance surface and the light exit surface.

[0089] In the example shown in FIG. 10, the support portion 32b is provided on the cover member 3 so as to extend downward from the lower surface of the support portion 32 of the cover member 3. The cover member 3 and the support portion 32b are connected via a first boundary 33. The cover member 3 is composed of a resin material having translucency. The support portion 32b is composed of a resin material containing a light reflecting material such as a white pigment or a light absorbing material such as a black pigment. The support portion 32b is disposed on the side surface of the wiring board 5 via an adhesive member or the like such that the side surface of the support portion 32b faces the side surface of the wiring board 5. The support portion 32b supports the cover member 3 so that the cover member 3 is disposed above the lens 2.

[0090] In the light emitting module 100b, the cover member 3 and the support portion 32b are integrally configured as a molded body directly bonded at their respective interfaces, thereby reducing the number of parts constituting the light emitting module 100b. This simplifies the configuration of the light emitting module 100b and makes it easier to manufacture the light emitting module 100b. In addition, in the light emitting module 100b, the cover member 3 having translucency and the support portion 32b having light blocking properties are configured as a molded body directly bonded at their respective interfaces, thereby reducing the amount of external light that enters the light emitting module 100b through the support portion 32b.

[0091] The effects of the light emitting module 100b other than those described above are similar to those of the first embodiment.

[0092] [Fourth embodiment] Next, a light emitting module according to a fourth embodiment will be described. Fig. 11 is a schematic cross-sectional view showing an example of a light emitting module 100c according to the fourth embodiment.

[0093] The light-emitting module 100c differs from the first embodiment in that the light source 1 has one light-emitting section 10, the lens 2 does not have an outer lens section outside the effective section 21, and the light source 1 has a driving circuit, an anti-static element, a temperature sensor, a photodiode, and other electronic components 8.

[0094] In the example shown in FIG. 11, the electronic component 8 is disposed between the light source 1 and the leg 23 on the upper surface of the wiring board 5. Moreover, the second region 312 and the electronic component 8 overlap in top view. By including the second region 312 in the cover member 3 and disposing the electronic component 8 below the second region 312, when the light-emitting module 100c is viewed from the +Z side of the upper surface 31u of the cover member 3, the electronic component 8 and the like disposed on the wiring board 5 are difficult to see. This can improve the aesthetic appearance of the light-emitting module 100c. Moreover, the light-emitting module 100c can also obtain the effect of reducing stray light on the irradiation surface and the effect of irradiating light to a desired region.

[0095] The effects of the light emitting module 100c other than those described above are similar to those of the first embodiment.

[0096] [Fifth embodiment] Next, a light emitting module according to the fifth embodiment will be described. Fig. 12 is a schematic cross-sectional view showing an example of a light emitting module 100d according to the fifth embodiment.

[0097] The light emitting module 100d further includes a support portion 32b that supports the cover member 3. In the light emitting module 100d, the cover member 3 includes a first cover portion 31a including a first region 311, and a second cover portion 31b that is provided around the first cover portion 31a and includes a second region 312. The second cover portion 31b is in contact with the outer edge of the first cover portion 31a and surrounds the entire circumference of the first cover portion 31a. The first cover portion 31a and the second cover portion 31b form a molded body that is directly bonded at their respective interfaces. The light emitting module 100d further includes a support portion 32 that is provided around the second cover portion 31b. The support portion 32 surrounds the entire circumference of the second cover portion 31b. The support portion 32 extends downward from the outer edge of the second cover portion 31b. The support portion 32b is provided on the lower surface of the support portion 32 of the cover member 3. The side of the support portion 32b faces the side of the wiring board 5 and is disposed on the side of the wiring board 5 via an adhesive or the like. The cover member 3 including the first cover portion 31a and the second cover portion 31b and the support portion 32b constitute a molded body directly bonded at their respective interfaces. The cover member 3 has light transmissivity. The support portion 32b has light blocking properties. The light emitting module 100d differs from the first embodiment in these respects. Note that in this embodiment, the molded body including the first cover portion 31a, the second cover portion 31b, and the support portion 32b directly bonded at their respective interfaces is, for example, a three-color molded body. The three-color molded body refers to a structure manufactured by a three-color molding process.

[0098] 12, the support portion 32b is provided on the cover member 3 so as to extend downward from the lower surface of the support portion 32 of the cover member 3. The cover member 3 and the support portion 32b are connected via a first boundary 33. Moreover, the first cover portion 31a and the second cover portion 31b are connected via a second boundary 34.

[0099] In the example shown in FIG. 12, the first region 311 is made of a resin material or the like that has translucency and does not contain a light diffusing material. The second region 312 is made of a resin material or the like that has translucency and contains a light diffusing material. The support portion 32b is made of a resin material or the like that contains a light reflective material such as a white pigment or a light absorbing material such as a black pigment. The support portion 32b is disposed on a side surface of the wiring board 5 via an adhesive member or the like. The support portion 32b supports the cover member 3 so that the cover member 3 is disposed above the lens 2.

[0100] In the light emitting module 100d, the cover member 3 including the first cover portion 31a including the first region 311 and the second cover portion 31b including the second region 312, and the support portion 32b are integrally formed as a molded body directly bonded at their respective interfaces, thereby reducing the number of parts constituting the light emitting module 100d. This simplifies the configuration of the light emitting module 100d and makes it easier to manufacture the light emitting module 100d. In addition, by providing the support portion 32b having a light blocking property in the light emitting module 100d, it is possible to reduce the amount of external light that enters the interior of the light emitting module 100d through the support portion 32b.

[0101] The effects and advantages of the light emitting module 100d other than those described above are similar to those of the first embodiment.

[0102] [Sixth embodiment] Next, a light emitting module according to a sixth embodiment will be described. Fig. 13 is a schematic cross-sectional view showing an example of a light emitting module 100e according to the sixth embodiment.

[0103] The light emitting module 100e differs from the first embodiment in that the outer surface of the cover member 3 includes a recess 35. The recess 35 is provided on the outer surface of the support portion 32 of the cover member 3, and is formed in a groove shape that goes around the support portion 32 in the circumferential direction.

[0104] The light emitting module 100e can be attached by fitting an adhesion member for adhering the light emitting module 100e to the housing of the smartphone into the recess 35. The adhesion member is an annular member formed from an elastic material such as natural rubber or synthetic rubber. When the light emitting module 100e is fixed to the housing of the smartphone with the adhesion member attached to the recess 35, the sealing effect of the adhesion member can reduce the intrusion of dust, liquid, and the like into the smartphone through the gap between the light emitting module 100e and the housing of the smartphone.

[0105] The effects and advantages of the light emitting module 100e other than those described above are similar to those of the first embodiment.

[0106] Although the preferred embodiments have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the claims.

[0107] The ordinal numbers, quantities, and other numbers used in the description of the embodiments are all provided as examples to specifically explain the technology of the present disclosure, and the present disclosure is not limited to the illustrated numbers. Furthermore, the connection relationships between the components are provided as examples to specifically explain the technology of the present disclosure, and do not limit the connection relationships that realize the functions of the present disclosure.

[0108] The light-emitting module of the present disclosure can reduce stray light on the irradiation surface, and therefore can be suitably used for lighting, camera flashes, vehicle headlights, etc. However, the light-emitting module of the present disclosure is not limited to these applications.

[0109] Aspects of the present disclosure are, for example, as follows. <Item 1> A light-emitting module comprising: a light source; a lens disposed on the light source and transmitting light from the light source; and a cover member disposed on the lens and including a lower surface through which the light is incident and an upper surface through which the light exits, wherein the lower surface of the cover member includes a first region through which light from the light source that has passed through the lens is incident, and a second region that is provided around the first region and has a higher light diffusibility than the first region; and the upper surface of the cover member is covered with a light-transmitting member that is harder than the cover member. <Item 2> The light source has a light-emitting region including at least one light-emitting surface, and the focal length of the lens is f, the shortest distance from the focal point of the lens on the optical axis of the lens to the bottom surface of the cover member is d, and the longest distance from the center of the light-emitting region to the outer edge of the light-emitting region in a direction along the light-emitting surface is D. The maximum width W of the first region in a direction along the bottom surface of the cover member is expressed by the following formula: W ≥ 2 × D × d / f The light emitting module according to <Item 1> above. <Item 3> The light-emitting module according to <Item 1> or <Item 2>, wherein the second region has a higher light diffusibility from the inside to the outside of the second region when viewed from above. <Item 4> The light-emitting module according to any one of <Item 1> to <Item 3>, wherein the underside of the cover member in the second region is provided with at least one of a rough surface and one or more protrusions. <Item 5> The light-emitting module according to <Item 3>, wherein at least one of a rough surface and one or more protrusions is provided on the lower surface of the cover member in the second region. <Item 6> The light-emitting module according to <Item 4>, wherein the one or more convex portions are a plurality of convex portions, and the plurality of convex portions are arranged in a concentric or radial pattern. <Item 7> The light-emitting module according to any one of <Item 1> to <Item 6>, further comprising a support part for supporting the cover member, the cover member and the support part constituting a molded body directly bonded at their respective interfaces, the cover member having light-transmitting properties, and the support part having light-blocking properties. <Item 8> The light-emitting module described in any one of <Item 1> to <Item 7>, wherein the cover member has a first cover portion including the first region and a second cover portion provided around the first cover portion and including the second region, and the first cover portion and the second cover portion form a molded body directly bonded at their respective interfaces. <Item 9> The light-emitting module according to any one of <Item 1> to <Item 8>, wherein a light diffusing material is disposed on the underside of the cover member in the second region. <Item 10> The light-emitting module according to any one of <Item 1> to <Item 9>, wherein a light diffusing material is contained inside the cover member that overlaps the second region when viewed from above. <Item 11> The light-emitting module according to any one of <Item 1> to <Item 10>, wherein the lens includes a convex lens. <Item 12> The light-emitting module according to any one of <Item 1> to <Item 11>, wherein the lens has an outer lens portion including a plurality of concentric convex portions on at least one of a light entrance surface and a light exit surface, and the outer lens portion overlaps with the second region when viewed from above. <Item 13> The light-emitting module according to any one of <Item 1> to <Item 12>, wherein the cover member includes a recess on an outer surface thereof. <Item 14> The light emitting module according to any one of <Item 1> to <Item 13>, wherein the light source includes a plurality of light emitting units, and the light from each of the plurality of light emitting units after passing through the lens irradiates an area located on the opposite side of each of the plurality of light emitting units with respect to a point on the optical axis of the lens as a center. <Item 15> The light source is a light emitting module described in any one of <Item 1> to <Item 14>, wherein the light source includes at least one light emitting unit, the light emitting unit having a light emitting element, a wavelength conversion member provided on the light emitting element, and a light shielding member covering each of a side surface of the light emitting element and a side surface of the wavelength conversion member. <Item 16> The light emitting module according to <Item 15>, wherein the light source includes a plurality of the light emitting units, and the light blocking member integrally holds a plurality of the light emitting elements and a plurality of the wavelength conversion members. <Item 17> The light emitting module according to any one of <Item 1> to <Item 16>, wherein the light emitting module is for use as a flash. <Item 18> A cover structure including a lens and a cover member disposed on the lens and including a lower surface and an upper surface, the lower surface of the cover member including a first region and a second region provided around the first region and having a higher light diffusibility than the first region, and the upper surface of the cover member is covered with a light-transmitting member having a higher hardness than the cover member. <Item 19> The cover structure according to <Item 18>, wherein the second region has a higher light diffusibility from the inside to the outside of the second region when viewed from above. <Item 20> The cover structure according to <Item 18> or <Item 19>, wherein at least one of a rough surface and one or more protrusions is provided on the lower surface of the cover member in the second region. <Item 21> The cover structure according to <Item 20>, wherein the one or more protruding portions are a plurality of protruding portions, and the plurality of protruding portions are arranged in a concentric or radial pattern. <Item 22> The cover structure according to any one of <Item 18> to <Item 21>, wherein a light diffusing material is disposed on the lower surface of the cover member in the second region. <Item 23> The cover structure according to any one of <Item 18> to <Item 22>, wherein a light diffusing material is contained inside the cover member that overlaps the second region when viewed from above. [Explanation of symbols]

[0110] 1 light source 10, 10-1 to 10-9 Light emitting part 11, 11-1 to 11-9 Light-emitting surface 12 Light emitting element 13 electrodes 14 Wavelength conversion material 15 Light-shielding material 16 Light-emitting area 2 Lenses 20 Optical axis 21 Valid Part 22 Outer lens part 23 Legs 24 1st convex surface 25 Second convex surface 3, 3a Cover member 31 Cover part 31a First cover part 31b Second cover part 31d bottom surface 31u top 311 First Area 312 Second Area 32, 32b Support part 33 First boundary 34 Second boundary 35 Recess 4 Translucent material 5. Wiring board 51 Wiring 52 Conductive materials 61 Convex 7 Cover structure 8. Electronic Components 100, 100b, 100c, 100d, 100e Light Emitting Module C Center of light source (center of light-emitting part) D Maximum distance d Shortest distance dx First light emitting surface distance dy Second light emitting surface distance W Maximum width Wx 1st width Wy Second width F focus f focal length G1 Effective Outer Edge G2 Outer Edge L light L1 First Light L2 Second Light P point p1 First interval p2 2nd interval Q Center of the first area

Claims

1. A light source; a lens disposed on the light source and transmitting light from the light source; a cover member disposed on the lens and including a lower surface through which light enters and an upper surface through which light exits; the lower surface of the cover member includes a first region into which the light from the light source that has passed through the lens is incident, and a second region that is provided around the first region and has a higher light diffusion property than the first region, A light-emitting module, wherein an upper surface of the cover member is covered with a light-transmitting member having a harderness than that of the cover member.

2. the light source has a light emitting area including at least one light emitting surface; The focal length of the lens is f, the shortest distance from the focal point of the lens on the optical axis of the lens to the bottom surface of the cover member is d, and the longest distance from the center of the light-emitting region to the outer edge of the light-emitting region in the direction along the light-emitting surface is D. The maximum width W of the first region in the direction along the bottom surface of the cover member is expressed by the following formula: W≧2×D×d / f The light emitting module according to claim 1 .

3. 3 . The light emitting module according to claim 1 , wherein the second region has a higher light diffusibility from an inside to an outside of the second region when viewed from above.

4. The light emitting module according to claim 1 , wherein the lower surface of the cover member in the second region is provided with at least one of a rough surface and one or more protrusions.

5. The light emitting module according to claim 3 , wherein the lower surface of the cover member in the second region is provided with at least one of a rough surface and one or more protrusions.

6. The light emitting module according to claim 4 , wherein the one or more protrusions are a plurality of protrusions, and the plurality of protrusions are arranged in a concentric or radial pattern.

7. A support portion that supports the cover member is further provided. the cover member and the support portion constitute a molded body directly bonded to each other at their respective interfaces, The cover member is translucent, The light-emitting module according to claim 1 , wherein the support portion has a light-shielding property.

8. the cover member has a first cover portion including the first region, and a second cover portion provided around the first cover portion and including the second region, 3. The light-emitting module according to claim 1, wherein the first cover portion and the second cover portion form a molded body directly bonded to each other at an interface between the first cover portion and the second cover portion.

9. The light-emitting module according to claim 1 , further comprising a light-diffusing material disposed on the underside of the cover member in the second region.

10. The light-emitting module according to claim 1 , wherein the cover member overlapping the second region in top view contains a light diffusing material therein.

11. The light emitting module according to claim 1 , wherein the lens includes a convex lens portion.

12. the lens has an outer lens portion including a plurality of concentric convex portions on at least one of a light entrance surface and a light exit surface, The light emitting module according to claim 1 , wherein the outer lens portion overlaps with the second region in a top view.

13. The light-emitting module according to claim 1 or 2, wherein the cover member includes a recess on an outer surface thereof.

14. The light source includes a plurality of light emitting units.

3. The light emitting module according to claim 1, wherein the light from each of the plurality of light emitting units after passing through the lens irradiates an area located on the opposite side of the position of each of the plurality of light emitting units with a point on the optical axis of the lens as a center.

15. The light source includes at least one light emitting portion, The light emitting unit includes a light emitting element, a wavelength converting member provided on the light emitting element, and a light shielding member covering each of a side surface of the light emitting element and a side surface of the wavelength converting member. The light emitting module according to claim 1 or 2.

16. The light source includes a plurality of the light emitting units, The light emitting module according to claim 15 , wherein the light blocking member integrally holds a plurality of the light emitting elements and a plurality of the wavelength converting members.

17. The light emitting module according to claim 1 or 2, wherein the light emitting module is for a flash.

18. Lenses and a cover member disposed on the lens and including a lower surface and an upper surface; the lower surface of the cover member includes a first region and a second region provided around the first region and having a higher light diffusibility than the first region; A cover structure, wherein an upper surface of the cover member is covered with a light-transmitting member having a harderness than the cover member.

19. The cover structure according to claim 18 , wherein the second region has a higher light diffusibility from the inside to the outside of the second region when viewed from above.

20. The cover structure according to claim 18 or 19, wherein the lower surface of the cover member in the second region is provided with at least one of a rough surface and one or more protrusions.

21. The cover structure according to claim 20 , wherein the one or more protrusions are a plurality of protrusions, and the plurality of protrusions are arranged in a concentric or radial pattern.

22. The cover structure according to claim 18 or 19, wherein a light diffusing material is disposed on the lower surface of the cover member in the second region.

23. The cover structure according to claim 18 or 19, wherein a light diffusing material is contained inside the cover member that overlaps the second region when viewed from above.

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