Light emitting module and cover structure

Abstract

Provided are a light-emitting module and a cover structure that reduce stray light on an irradiation surface. The light-emitting module 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 on which light enters and an upper surface on which light exits, the lower surface of the cover member including a first region on which light from the light source passing through the lens enters, and a second region provided around the first region and having higher light diffusivity than the first region. The upper surface of the cover member is covered by a translucent member having a higher hardness than the cover member.

Description

Technical Field

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

[0002] Conventionally, light emitting modules including semiconductor elements such as LEDs (Light Emitting Diodes) are widely used. For example, Patent Document 1 discloses a light emitting module including a light source unit, a lens, and a cover member, wherein a diffusion portion formed of a plurality of parallel grooves is formed in a portion of the cover member.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: International Publication No. 2015 / 125557 Summary of the Invention

[0006] Problems to be solved by the invention

[0007] In a light-emitting module, it is required to reduce stray light on an irradiated surface.

[0008] An object of the embodiments of the present disclosure is to provide a light emitting module and a cover structure that reduce stray light on an irradiated surface.

[0009] Methods for solving problems

[0010] One embodiment of the present disclosure relates to a light-emitting module comprising a light source; a lens disposed on the light source and transmitting light from the light source; a covering member disposed on the lens and including a lower surface for light incidence and an upper surface for light emission, the lower surface of the covering member including a first region for incident light from the light source that passes through the lens, and a second region that is arranged around the first region and has higher light diffusivity than the first region, and the upper surface of the covering member is covered by a light-transmitting member having a higher hardness than that of the covering member.

[0011] One embodiment of the present disclosure involves a covering structure having a lens and a covering member arranged on the lens, including a lower surface and an upper surface, wherein the lower surface of the above-mentioned covering member includes a first area and a second area arranged around the above-mentioned first area and having a higher light diffusion property than the above-mentioned first area, and the upper surface of the above-mentioned covering member is covered by a translucent member having a harder hardness than the above-mentioned covering member.

[0012] Effects of the Invention

[0013] According to the embodiments of the present disclosure, it is possible to provide a light emitting module and a cover structure that reduce stray light on an irradiation surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic plan view showing an example of the light emitting module according to the first embodiment.

[0015] Figure 2 for Figure 1 Schematic cross-sectional view along line II-II in FIG.

[0016] Figure 3 It is a schematic plan view showing a configuration example of a light source in the light emitting module according to the first embodiment.

[0017] Figure 4 for Figure 3 Schematic cross-sectional view along line IV-IV in FIG.

[0018] Figure 5 for Figure 1 The schematic cross-sectional view of the II-II line in FIG. Figure 1 FIG1 shows the function of the covering member in the light emitting module.

[0019] Figure 6 for Figure 1 The schematic cross-sectional view of the line VI-VI in FIG. Figure 1 FIG2 shows the function of the covering member in the light emitting module.

[0020] Figure 7 It is a schematic bottom view showing another example of the covering member.

[0021] Figure 8 It is a schematic bottom view showing a first example of a covering member included in the light emitting module according to the second embodiment.

[0022] Figure 9 It is a schematic bottom view showing a second example of the covering member included in the light emitting module according to the second embodiment.

[0023] Figure 10 It is a schematic cross-sectional view showing an example of a light emitting module according to a third embodiment.

[0024] Figure 11 It is a schematic cross-sectional view showing an example of a light emitting module according to a fourth embodiment.

[0025] Figure 12 It is a schematic cross-sectional view showing an example of a light emitting module according to a fifth embodiment.

[0026] Figure 13 It is a schematic cross-sectional view showing an example of a light emitting module according to the sixth embodiment.

[0027] Description of Reference Numerals

[0028] 1 Light source

[0029] 10, 10-1~10-9 luminous part

[0030] 11. 11-1 to 11-9 Luminous surface

[0031] 12 Light-emitting elements

[0032] 13 electrodes

[0033] 14 Wavelength conversion component

[0034] 15 Light-shielding member

[0035] 16 Luminous Area

[0036] 2 lenses

[0037] 20 optical axis

[0038] 21 effective part

[0039] 22 Outer lens part

[0040] 23 Legs

[0041] 24 1st convex surface

[0042] 25 2nd convex surface

[0043] 3.3a ​​Covering components

[0044] 31 Covering

[0045] 31a First covering portion

[0046] 31b Second covering part

[0047] 31d below

[0048] 31u above

[0049] 311 Area 1

[0050] 312 Area 2

[0051] 32, 32b Support Department

[0052] 33 The First Boundary

[0053] 34 The Second Boundary

[0054] 35 films

[0055] 4 Translucent components

[0056] 5. Wiring board

[0057] 51 Wiring

[0058] 52 Conductive components

[0059] 61 bulge

[0060] 7 Covering Structure

[0061] 8 Electronic components

[0062] 100, 100b, 100c, 100d, 100e light-emitting modules

[0063] C Center of the light source (center of the light emitting part)

[0064] D Longest distance

[0065] d Shortest distance

[0066] dx 1st light emitting surface interval

[0067] dy 2nd light emitting surface interval

[0068] W Maximum width

[0069] Wx 1st width

[0070] Wy 2nd width

[0071] F Focus

[0072] f focal distance

[0073] G1 effective outer edge

[0074] G2 outer edge

[0075] L light

[0076] L1 First Light

[0077] L2 Second Light

[0078] Point P

[0079] p1 1st interval

[0080] p2 2nd interval

[0081] Q The center of area 1. DETAILED DESCRIPTION

[0082] Regarding the light emitting module and the cover structure according to the embodiment of the present disclosure, Figure 1Detailed description is given below. Among them, the following examples illustrate the light-emitting module and the covering structure for realizing the technical idea of ​​the present embodiment, and are not limited to the following. In addition, the size, material, shape, relative configuration, etc. of the components described in the embodiment, unless otherwise specified, are not intended to limit the scope of the present disclosure to only these, but are simple illustrative examples. In addition, the size, positional relationship, etc. of the components shown in the drawings are sometimes exaggerated in order to make the description clear. In addition, in the following description, for the same name, symbol, representing the same or homogeneous components, detailed description is appropriately omitted. As a cross-sectional view, an end view that only shows a cut section is sometimes used.

[0083] In the following figures, directions are sometimes represented by the X-axis, Y-axis, and Z-axis, which are mutually orthogonal. The X-direction along the X-axis and the Y-direction along the Y-axis represent 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 represents a direction orthogonal to the light-emitting surface. That is, the light-emitting surface of the light-emitting unit is parallel to the XY plane, and the Z-axis is orthogonal to the XY plane.

[0084] The direction indicated by the arrow in the X direction is expressed as the +X side, and the side opposite to the +X side is expressed as the -X side. The direction indicated by the arrow in the Y direction is expressed as the +Y side, and the side opposite to the +Y side is expressed as the -Y side. The direction indicated by the arrow in the Z direction is expressed as the +Z side, and the side opposite to the +Z side is expressed as the -Z side. In the embodiments, the light-emitting portion of the light-emitting module emits light along the +Z side as an example. In addition, the term "top view" in the embodiments refers to observing the object from the +Z side. However, these do not limit the orientation of the light-emitting module during use, and the orientation of the light-emitting module is arbitrary.

[0085] In this specification, the surface of an object when viewed from the +Z side is referred to as the "upper side," and the surface of an object when viewed from the -Z side is referred to as the "lower side." In the embodiments described below, the object has an inclination within a range of ±10° relative to the X, Y, and Z axes. Furthermore, in this embodiment, orthogonality can include an error within ±10° relative to 90°.

[0086] In this specification or elsewhere, when multiple components are present, these components may be distinguished by prefixing them with "first," "second," or the like. Furthermore, the objects used to distinguish between this specification and the claims may differ. Therefore, even if a claim describes a component with the same prefix as in this specification, the objects specified by that component may differ between this specification and the claims.

[0087] For example, in this specification, there are constituent elements that are distinguished by being annotated as "1st", "2nd", and "3rd". In this specification, when constituent elements annotated as "1st" and "3rd" are recorded in the claims, or when a constituent element annotated as "1st" and a constituent element without a specific ordinal number are recorded in the claims, from the perspective of ease of understanding, the claims sometimes use "1st" and "2nd" to distinguish the constituent elements. In this case, the constituent elements annotated as "1st" and "2nd" in the claims refer to the constituent elements annotated as "1st" and "3rd" or the constituent element without a specific ordinal number in this specification, respectively. In addition, the applicable objects of this rule are not limited to constituent elements, and it is also reasonably and flexibly applicable to other objects.

[0088] [First embodiment]

[0089] <Configuration Example of Light-Emitting Module According to First Embodiment>

[0090] Reference Figure 1 and Figure 2 , the structure of the light emitting module according to the first embodiment will be described. Figure 1 It is a schematic plan view showing an example of the light emitting module 100 according to the first embodiment. Figure 2 for Figure 1 Schematic cross-sectional view along line II-II in FIG. The light emitting module 100 is, for example, a light emitting module mounted on a smartphone and provided for use as a flash in the smartphone's camera. Cameras include cameras for capturing still images and video cameras.

[0091] 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 where the light L is incident and an upper surface 31u where the light L is emitted. The lower surface 31d of the cover member 3 includes a first region 311 where the light L from the light source 1, which has passed through the lens 2, is incident; and a second region 312 disposed around the first region 311 and having a higher light diffusivity than the first region 311. The upper surface 31u of the cover member 3 is covered by a light-transmitting member 4 having a higher hardness than the cover member 3.

[0092] Figure 2 In the example shown, the second region 312 has higher light diffusivity than the first region 311 by making the lower surface 31 d of the cover member 3 a rough surface.

[0093] 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. Thus, in this embodiment, stray light that tends to be generated by the light L2 that passes outside the effective outer edge G1 of the effective portion 21 is reduced, and a light-emitting module 100 that reduces stray light on the irradiated surface can be provided.

[0094] Furthermore, in the light-emitting module 100, the upper surface 31u of the cover member 3 is covered by the light-transmitting member 4, which has a higher hardness 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 smartphone housing, damage to the upper surface 31u of the cover member 3 can be prevented, and the chemical resistance of the upper surface 31u of the cover member 3 can be improved.

[0095] Figure 1 and Figure 2 In the example shown, the shape of the light emitting module 100 in a plan view is substantially circular, but the shape of the light emitting module 100 in a plan view may be substantially rectangular, substantially elliptical, or substantially polygonal.

[0096] The wiring substrate 5 is a plate-shaped member that is generally circular in plan view. The wiring substrate 5 is a substrate having wiring that can mount the light source 1 and various electronic components. The shape of the wiring substrate 5 in plan view can be generally rectangular, generally elliptical, or generally polygonal.

[0097] Light source 1 is disposed on the upper surface (the surface on the +Z side) of wiring substrate 5 . Light source 1 has a light emitting region 16 including at least one light emitting surface 11 . Figure 1 and Figure 2 In the example shown, the light source 1 includes nine light-emitting sections 10, each of which has a light-emitting surface 11. The region including the plurality of 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 a plurality of 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 outside when viewed from above. The light source 1 emits light L from the light-emitting surface 11 included in each of the plurality of light-emitting sections 10 in the direction where the lens 2 is located. In addition, the number of light-emitting sections 10 included in the light source 1 is not limited to nine, as long as it is at least one.

[0098] The light-emitting module 100 can illuminate the multiple light-emitting units 10 individually or in groups. By illuminating the multiple light-emitting units 10 individually or in groups at a desired brightness, the light-emitting module 100 can improve the contrast of the illuminated surface illuminated by the light L from the light source 1. Furthermore, by illuminating the multiple light-emitting units 10 individually or in groups, the light-emitting module 100 can partially illuminate the illuminated surface. Partial illumination refers to illuminating a portion of the illuminated surface with light.

[0099] Partial illumination is to illuminate a partial area in the illumination surface. Therefore, in order to make the light irradiating the desired area noticeable, the outer edge of the irradiated light is preferably clear. That is, the illuminance difference between the desired area to be irradiated and the area outside the desired area is preferably large. In other words, in the desired area to be irradiated in the illumination surface, the stray light around the irradiated light is preferably small. In the light-emitting module 100, by reducing the stray light in the illumination surface, the light L is irradiated to the desired area, and the light irradiated to the area outside the desired area is reduced. As a result, the illuminance difference between the desired area to be irradiated and the area outside the desired area can be increased, making the light irradiating the desired area noticeable.

[0100] When the light-emitting module 100 is used as a flashlight for an imaging device, for example, it is possible to switch between a wide-angle mode in which all light-emitting units 10 emit light, and a narrow-angle mode in which only the light-emitting units 10 located near the center of the light-emitting region 16 emit light, while the light-emitting units 10 located near the outer edge G2 of the light-emitting region 16 do not emit light. The narrow-angle mode has a narrower light distribution angle than the wide-angle mode. The light-emitting module 100 can switch between emitting light in accordance with the wide-angle and narrow-angle modes, enabling, for example, the imaging device to use the light emitted from the light-emitting module 100 to perform photography in accordance with photography modes such as macro photography and telephoto photography.

[0101] In the light-emitting module 100, the light L from each of the multiple light-emitting parts 10 after passing through the lens 2 illuminates the area on the opposite side of the position of each of the multiple light-emitting parts 10, with 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 part 21. As a result, the relationship between the multiple light-emitting parts 10 and the irradiation position brought by the light-emitting parts 10 in the irradiation surface on which the light L from the light-emitting module 100 is irradiated is easy to grasp, and light control becomes easy. From another point of view, partial irradiation of the irradiation surface becomes easy in the light-emitting module 100. In addition, in the light-emitting module 100, most of the light L from the light-emitting part 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 use the first convex surface 24 and the second convex surface 25 to irradiate the light L from the light source 1 to the desired area.

[0102] also, Figure 2 In the illustrated example, the light-emitting module 100 includes a second region 312 that overlaps with a region outside the effective portion 21 of the lens 2 when viewed from above. Consequently, within the light-emitting module 100, the effective outer edge G1 of the effective portion 21 and the region outside the effective outer edge G1 are less easily visible from outside the light-emitting module 100. This improves the aesthetic appearance of the light-emitting module 100.

[0103] (Lens 2)

[0104] The lens 2 is an optical element disposed on the light source 1 and transmits the light L from the light source 1 . Figure 2 In the example shown, 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) in which the light source 1 is located. The second convex surface 25 protrudes in the direction opposite to the direction (+Z side) in which the light source 1 is located. The outer lens portion 22 is an annular portion provided on the outside of the effective portion 21 when viewed from above. In this embodiment, the annular shape includes not only circular shapes such as a wheel, but also closed shapes that do not intersect with themselves. The outer lens portion 22 is provided in a manner that protrudes on the outside of the effective portion 21 in the lens 2, along the +Z side (hereinafter sometimes referred to as the upper side).

[0105] The leg portion 23 is an annular portion provided on the outside of the effective portion 21 when viewed from above. The leg portion 23 is provided so as to extend along the -Z side (hereinafter sometimes referred to as the bottom) outside the effective portion 21 in the lens 2. The leg portion 23 is arranged on the upper surface of the wiring substrate 5 via an adhesive member or the like. The leg portion 23 supports the effective portion 21 and the outer lens portion 22 in such a manner that the effective portion 21 of the lens 2 is arranged above the light source 1 and the outer lens portion 22 is arranged on the outside of the effective portion 21 when viewed from above.

[0106] Figure 2 In the example shown, the outer lens portion 22 includes a plurality of concentric convex portions with the optical axis 20 of the lens 2 as the center on the light emitting surface of the upper surface of the lens 2. The plurality of concentric convex portions have a sawtooth or wavy shape. The plurality of concentric convex portions can be, for example, a Fresnel shape. When viewed from above, the plurality of concentric convex portions in the outer lens portion 22 can be used as irradiated light by, in particular, irradiating light (stray light) emitted from the outer light-emitting portion 10 and reflected toward the outside of the light-emitting module 100, or refracting it, thereby enabling it to be used as irradiated light through the first area 311 of the covering member 3. In addition, the convex portions of the outer lens portion 22 assist the light-gathering 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 convex portions in the outer lens portion 22.

[0107] In the light-emitting module 100, the lens 2 preferably includes a convex lens portion. The effective portion 21 of the lens 2 forms a biconvex single lens with a first convex surface 24 and a second convex surface 25. Light L from the light source 1 is temporarily focused by the first and second convex surfaces 24, 25 at a focal point F located at the center P, and then irradiates the irradiated surface as divergent light. In the lens 2 comprising a convex lens, the focal point F is located on the +Z side of the lens 2. The light L from each light-emitting unit 10 is focused at the focal point F and then disperses. This reduces the risk of light L emitted by 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. Furthermore, the light L from the light source 1 can be efficiently irradiated through the lens 2. However, the lens 2 is not limited to a biconvex single lens and may also be a plano-convex single lens, a biconcave single lens, a plano-concave single lens, a Fresnel lens, a lens array composed of multiple lenses, an array lens, a meniscus single lens, an aspherical lens, a cylindrical lens, or other similar lenses.

[0108] The shape of the lens 2 when viewed from above is generally circular. However, the shape of the lens 2 when viewed from above may be generally rectangular, elliptical, or polygonal, among others. Furthermore, the shape of the lens 2 when viewed from above may be rotationally symmetrical. Considering that the imaging range of a typical imaging device is generally rectangular, the shape of the lens 2 when viewed from above is preferably a quadratic rotationally symmetrical shape or a bi-directional rotationally symmetrical shape. The curvature radii of the first convex surface 24 and the second convex surface 25 of the lens 2, the relationship between the respective curvature radii, and the lens thickness may also be appropriately modified.

[0109] The lens 2 is translucent to the light emitted from the light source 1 and is made of at least one of a resin material such as polycarbonate resin, acrylic resin, silicone resin, epoxy resin, or a glass material. Figure 2In the example shown, the effective portion 21, the outer lens portion 22, and the leg portion 23 are connected to each other as an integral member. The light transmittance of the lens 2 refers to the property of transmitting 60% or more of the light L from the light source 1.

[0110] (Covering member 3)

[0111] Figure 2 In the illustrated example, the cover member 3 includes a cover portion 31 and a support portion 32. When viewed from above, the support portion 32 extends along the entire periphery of the cover portion 31. 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 both the cover portion 31 and the support portion 32. The cover portion 31 and the support portion 32 are integrally formed.

[0112] Figure 2 In the example shown, the cover portion 31 is arranged on the lens 2 so as to overlap the light source 1 and the lens 2 when viewed from above. 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 arranged on the side surface of the wiring substrate 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 substrate 5. The support portion 32 supports the cover portion 31 so that the cover portion 31 is arranged above the lens 2. Figure 1 In the example shown, the shape of the covering member 3 in a plan view is substantially circular, but the shape of the covering member 3 in a plan view may be substantially rectangular, substantially elliptical, or substantially polygonal.

[0113] The lower surface 31d of the cover member 3 includes 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. Figure 1 In the figure, the area is indicated by dotted shadows.

[0114] The outer edge of the first region 311 is roughly circular in plan view. The inner and outer edges of the second region 312 are also roughly circular in plan view. In other words, the second region 312 is annular. That is, in plan view, the first region 311 is positioned inside the annular second region 312. Furthermore, the annular second region 312 overlaps with the multiple concentrically shaped protrusions of the outer lens portion 22. Figure 1 and Figure 2 In the example shown, 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 portion 10) overlap when viewed from above. However, the shapes of the inner and outer edges of the second region 312 may differ when viewed from above and may be substantially rectangular, substantially elliptical, or substantially polygonal.

[0115] In the light emitting module 100 , at least one of a rough surface and one or more convex portions is provided on the lower surface 31 d of the cover member 3 in the second region 312 . Figure 2 In the example shown, 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 rough. The arithmetic mean roughness Ra of the flat surface is preferably less than 0.3 μm, more preferably less than 0.2 μm. The arithmetic mean roughness Ra of the rough surface is preferably between 0.3 μm and 2.0 μm, more preferably between 0.5 μm and 1.5 μm. The rough surface can be formed by sandblasting, laser processing, molding, etc. Alternatively, the rough surface can be used without polishing the glass surface before polishing. By providing at least one of a rough surface and one or more protrusions on the lower surface 31d of the cover member 3 in the second region 312, the light diffusivity of the second region 312 is increased compared to that of the first region 311. The light diffusivity of the first region 311 is lower than that of the second region 312, and preferably has essentially no light diffusivity. Thus, of the light L from the light source 1, the light incident on the second region 312, that is, the light as stray light, is diffused and emitted from the upper surface 31u of the cover member 3 overlapping with the second region 312 when viewed from above. As a result, the light transmitted through the second region 312 can be made less noticeable, while the light transmitted through the inner side of the first region 311 can be made noticeable when viewed from above.

[0116] In the light-emitting module 100, the light diffusing properties of the second region 312 can 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 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 by, for example, applying a resin containing the light diffusing material to the lower surface 31d or attaching a plate-shaped member containing the light diffusing material to the lower surface 31d.

[0117] In the light emitting module 100 , the light diffusing property of the second region 312 can be imparted by including a light diffusing material in the interior of the cover member 3 overlapping the second region 312 in a plan view.

[0118] Furthermore, in the light emitting module 100, a light diffusing material can be arranged in a region overlapping with the second region 312 of the upper surface 31u of the cover member 3 in a plan view. For example, in the light emitting module 100, a light diffusing material can be arranged in a desired region of the upper surface 31u of the cover member 3 by inkjet printing or the like.

[0119] The cover member 3 is composed of at least one of a resin material such as polycarbonate, acrylic, silicone, or epoxy resin, or a glass material that is translucent to the light emitted by the plurality of light-emitting units 10. The translucency in the first region 311 and the second region 312 of the cover member 3 means that at least 60% of the light L from the light source 1 is transmitted.

[0120] Figure 1 and Figure 2 In the example shown, the support portion 32 is a cylindrical portion having a substantially circular shape in a plan view. However, the shape of the support portion 32 in a plan view may be a substantially elliptical shape, a substantially polygonal shape, or the like.

[0121] (Light-transmitting member 4)

[0122] The translucent member 4 is a member used to protect the upper surface 31u of the cover member 3. Translucent member 4 is translucent and transmits light entering from the first region 311 and the second region 312 and exiting from the upper surface 31u of the cover member 3 at the lower surface 31d of the cover member 3. Translucent member 4 has little effect on the light transmittance and light diffusivity of the first region 311 and the second region 312. Translucent member 4 is made of a resin material such as polycarbonate resin, acrylic resin, silicone resin, epoxy resin, or urethane resin, or glass, and is made of a material with a higher hardness than that of the cover member 3. If the light diffusivity of the second region 312 is higher than that of the first region 311, the translucent member 4 may contain an appropriate amount of a light-diffusing material such as silica or alumina. The light transmittance is preferably such that at least 60% of the light from the light-emitting element 12 is transmitted. To ensure sufficient protection, the thickness of the translucent member 4 is preferably between 0.1 μm and 100 μm.

[0123] The light-transmitting member 4 can be disposed on the cover member 3 by spraying, pouring, sputtering, atomic layer deposition (ALD), or the like. Using ALD allows the film thickness to be controlled at the atomic layer level, allowing a flat and dense light-transmitting member 4 to be disposed on the cover member 3. Alternatively, a separately formed light-transmitting member 4 can be disposed on the cover member 3 using an adhesive such as a resin.

[0124] If the upper surface of the covering member has a second region including a rough surface or one or more protrusions, and the translucent member is arranged in contact with the second region on the upper surface of the covering member, the translucent member buries the rough surface or one or more protrusions on the upper surface of the covering 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 side of the covering member 3 with the translucent member 4, thereby preventing damage to the upper surface 31u of the covering member 3 and improving the chemical resistance of the upper surface 31u of the covering member 3, the first region 311 and the second region 312 are arranged on the lower surface of the covering member 3, thereby effectively reducing the stray light of the light L emitted from the light source 1.

[0125] In this embodiment, the structure including the lens 2, the cover member 3, and the translucent member 4 is referred to as a cover structure 7. The cover structure 7 includes the cover member 3, which 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, which is disposed around the first region 311 and has a higher light diffusivity than the first region 311. The upper surface 31u of the cover member 3 is covered by the translucent member 4, which has a higher hardness than the cover member 3.

[0126] The light-emitting module 100 of this embodiment includes a covering structure 7. The covering structure 7 in this embodiment is arranged on the upper surface of the wiring substrate 5 via a bonding member or the like through the leg portion 23 of the lens 2, and is arranged on the side of the wiring substrate 5 via a bonding member or the like in such a manner that the side of the support portion 32 of the covering member 3 faces the side of the wiring substrate 5, thereby fixing their positions to each other. That is, the covering structure in this embodiment is in a state where the lens 2 and the covering member 3 are not directly or indirectly bonded to each other, but are fixed to each other's positions via other members. In addition, the lens 2 and the covering member 3 may be bonded directly or indirectly. For example, the lens 2 and the covering member 3 are bonded directly or via a bonding member or the like, so that even when their positions to each other are fixed, the structure including the lens 2, the covering member 3, and the translucent member 4 is the covering structure 7.

[0127] (Light Source 1)

[0128] Reference Figure 3 and Figure 4 , the structure of the light source 1 in the light emitting module 100 will be described in detail. Figure 3 It is a schematic plan view showing an example of the structure of the light source 1 . Figure 4 for Figure 3 Schematic cross-sectional view along line IV-IV in FIG.

[0129] Figure 3As shown, light source 1 includes a plurality of light emitting units 10, each including a light emitting surface 11. Each of light emitting units 10 emits light from light emitting surface 11 toward lens 2 provided above light source 1. Light emitting surface 11 is a main light extraction surface of light emitting unit 10.

[0130] Figure 3 In the example shown, the light source 1 includes a plurality of light-emitting sections 10 arranged vertically, horizontally, or in rows and columns when viewed from above. Furthermore, the light source 1 includes nine light-emitting sections 10: 10-1, 10-2, 10-3, 10-4, 10-5, 10-6, 10-7, 10-8, and 10-9. These nine light-emitting sections 10 correspond to a plurality of light-emitting sections. The plurality of light-emitting sections 10 are arranged along the X direction, or along both the X and Y directions. Figure 3 In FIG, nine light emitting units 10 are arranged along the X direction and the Y direction.

[0131] The 9 light-emitting parts 10 include corresponding 9 light-emitting surfaces 11. That is, the light-emitting part 10-1 includes the light-emitting surface 11-1, the light-emitting part 10-2 includes the light-emitting surface 11-2, the light-emitting part 10-3 includes the light-emitting surface 11-3, the light-emitting part 10-4 includes the light-emitting surface 11-4, and the light-emitting part 10-5 includes the light-emitting surface 11-5. In addition, the light-emitting part 10-6 includes the light-emitting surface 11-6, the light-emitting part 10-7 includes the light-emitting surface 11-7, the light-emitting part 10-8 includes the light-emitting surface 11-8, and the light-emitting part 10-9 includes the light-emitting surface 11-9. From the light-emitting surface 11-1, the light-emitting surface 11-9 is preferably arranged on the inner side of the lens 2 (closer to the inner side than the outer shape of the lens 2) when viewed from above, and more preferably arranged on the inner side than the effective part 21. In addition, when viewed from above, the light-emitting part 10 overlaps with the light-emitting surface 11, so Figure 3 In FIG. 1 , the symbol of the light emitting portion 10 and the symbol of the light emitting surface 11 are described together. Hereinafter, when two or more symbols are substantially identical or overlapped, the symbols may be described together.

[0132] Figure 3In the example shown, the shape of the light-emitting surface 11 in a plan view is roughly rectangular. The first width Wx represents the width along the X direction of the light-emitting surface 11. The second width Wy represents the width along the Y direction of the light-emitting surface 11. The first width Wx and the second width Wy are, for example, not less than 50 μm and not more than 2000 μm, preferably not less than 200 μm and not more than 1000 μm. The first width Wx and the second width Wy may be substantially the same or different. In the present embodiment, the light-emitting surfaces 11 of adjacent light-emitting portions 10 are arranged with a predetermined interval between each other in a plan view. 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 perspective of the light-emitting characteristics of the light-emitting module 100, the narrower the first light-emitting surface interval dx and the second light-emitting surface interval dy, the better. However, there are limitations on the intervals at which multiple light-emitting portions 10 can be installed. In order to achieve both good light-emitting characteristics and the ability to space multiple light-emitting units 10, the first light-emitting surface interval dx and the second light-emitting surface interval dy are preferably both 10 μm or greater and 50 μm or less. However, the shape of the light-emitting surface 11 in plan view may be substantially circular, elliptical, or polygonal, such as a substantially triangular or hexagonal shape.

[0133] (Light-emitting unit 10)

[0134] Figure 4 As shown, light-emitting section 10-1 is arranged on the +Z side of wiring substrate 5, with its top surface serving as light-emitting surface 11-1 and its surface opposite light-emitting surface 11-1 serving as the mounting surface. Light-emitting section 10-1 includes a light-emitting element 12, a wavelength conversion member 14 disposed on light-emitting element 12, and a light-shielding member 15 that covers the side surfaces of light-emitting element 12 and wavelength conversion member 14, excluding the top surface of wavelength conversion member 14. In other words, the side surfaces of light-emitting element 12 and wavelength conversion member 14 are covered by light-shielding member 15. This configuration reduces light leakage from the side surfaces of light-emitting element 12 and wavelength conversion member 14, allowing light from light source 1 to be directed to a desired area.

[0135] The light shielding members 15 of adjacent light emitting units 10 are continuous. Specifically, the light shielding members 15 integrally hold the light emitting elements 12 and the wavelength conversion members 14. This configuration allows for the simultaneous installation of multiple light emitting units 10 and for the narrowing of the spacing between the light emitting surfaces 11.

[0136] Figure 3In the example shown, the light source 1 includes multiple light-emitting sections 10, and the light-emitting surfaces 11 of adjacent light-emitting sections 10 are separated by a light-shielding member 15. However, adjacent light-emitting surfaces 11 may be continuous. For example, a single wavelength conversion member 14 may cover all of the multiple light-emitting elements 12. In this case, the first light-emitting surface interval dx and the second light-emitting surface interval dy are zero.

[0137] 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 (ie, the bottom surface).

[0138] The light emitting element 12 preferably includes various semiconductors such as a III-V compound semiconductor and a II-VI compound semiconductor. 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, and InGaAlN can also be used. Light-emitting element 12 is, for example, an LED or LD (Laser Diode). The peak emission wavelength of light-emitting element 12 is preferably 400 nm to 530 nm, more preferably 420 nm to 490 nm, and even more preferably 450 nm to 475 nm, from the perspectives of luminous efficiency and excitation of the wavelength conversion material.

[0139] The wavelength conversion member 14 is, for example, a roughly rectangular member when viewed from above. It is positioned so as to cover the upper surface of the light-emitting element 12. The wavelength conversion member 14 contains a wavelength conversion substance that converts the wavelength of at least a portion of the light emitted from the light-emitting element 12. The wavelength conversion member 14 can be formed using a light-transmitting resin material, ceramic, glass, or other inorganic material. The resin material includes thermosetting resins such as silicone resin, silicone-modified resin, epoxy resin, epoxy-modified resin, and phenolic resin. Silicone resin or its modified resins, which have excellent light and heat resistance, are particularly suitable. The light transmittance is preferably such that at least 60% of the light emitted from the light-emitting element 12 is transmitted. Alternatively, the wavelength conversion member 14 can be made of a thermoplastic resin such as polycarbonate resin, acrylic resin, methylpentene resin, or polynorbornene resin. Furthermore, the wavelength conversion member 14 can contain the aforementioned light-diffusing substance within the resin. For example, the wavelength conversion member 14 can be a member containing the wavelength conversion substance within a resin material, ceramic, glass, or the like, or can be a sintered body of the wavelength conversion substance. Alternatively, the wavelength converting member 14 may be a multilayered member in which resin layers containing a wavelength converting substance and a light diffusing substance are arranged on the ±Z side surfaces of a molded body of resin, ceramic, glass, or the like.

[0140] As the wavelength conversion material contained in the wavelength conversion member 14, for example, a yttrium-aluminum-garnet phosphor (for example, (Y, Gd) 3 (Al, Ga) 5 O 12 :Ce), lutetium-aluminum-garnet phosphors (e.g., Lu3(Al, Ga)5O 12 :Ce), terbium-aluminum-garnet phosphor (for example, Tb3(Al, Ga)5O 12 :Ce), CCA series 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) acid nitride 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-based phosphors such as MGF-based phosphors (e.g., 3.5Mg0-0.5MgF2-Ge02:Mn), quantum dots with a perovskite structure (e.g., (Cs, FA, MA)(Pb, Sn)(F, Cl, Br, I)3, where FA and MA represent formamidine and methylammonium, respectively), II-VI group quantum dots (e.g., CdSe), III-V group quantum dots (e.g., InP), or quantum dots with a chalcopyrite structure (e.g., (Ag, Cu)(In, Ga)(S, Se)2). The wavelength-converting substances described above are particles. Furthermore, one of these wavelength-converting substances can be used alone, or two or more of them can be used in combination.

[0141] 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 converts the wavelength of light emitted from the light emitting element 12 into yellow, thereby emitting white light.

[0142] 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 can isolate adjacent light-emitting units from each other in the plurality of light-emitting units 10. In order to improve light extraction efficiency, the light-shielding member 15 is preferably formed of a member with high light reflectivity. For example, a resin material containing a light-reflective substance such as white pigment can be used for the light-shielding member 15.

[0143] 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, and silicon oxide. It is preferred to use one of these alone or to use two or more of these in combination. Furthermore, as the resin material, a resin material having a thermosetting resin such as epoxy resin, epoxy-modified resin, silicone resin, silicone-modified resin, or phenolic resin as the main component is preferably used as the matrix.

[0144] Light-emitting section 10 is electrically connected to wiring 51 provided on wiring substrate 5. Wiring substrate 5 has wiring 51 on its surface. Wiring substrate 5 may also have wiring 51 internally. Light-emitting section 10 and wiring substrate 5 are electrically connected by connecting wiring 51 of wiring substrate 5 and at least one pair of positive and negative electrodes 13 of light-emitting section 10 via conductive member 52.

[0145] The wiring substrate 5 is preferably constructed of an insulating material as a base material, and preferably a material that is less likely to transmit light emitted from the light-emitting portion 10, external light, and the like. Furthermore, the wiring substrate 5 is preferably constructed of a material having a certain strength. Specifically, the wiring substrate 5 can be constructed of a resin as a base material, such as alumina, aluminum nitride, mullite, or silicon nitride; or a resin such as a phenolic resin, epoxy resin, polyimide resin, BT resin (bismaleimide triazine resin), polyphthalamide, or polyester resin.

[0146] The wiring 51 can be made of at least one of copper, iron, nickel, tungsten, chromium, aluminum, silver, gold, titanium, palladium, rhodium, or alloys thereof. Furthermore, the surface layer of the wiring 51 can be formed of silver, platinum, aluminum, rhodium, gold, or alloys thereof from the perspectives of wettability and / or light reflectivity of the conductive member 52.

[0147] <Main Function of Covering Member 3>

[0148] Reference Figure 5 and Figure 6 , the function of the covering member 3 in the light emitting module 100 will be described. Figure 5 for Figure 1 The schematic cross-sectional view taken along line II-II in FIG. 1 is a first diagram illustrating the function of the cover member 3 in the light emitting module 100 . Figure 6 for Figure 1 The schematic cross-sectional view taken along line VI-VI in FIG. 1 is a second diagram illustrating the function of the cover member 3 in the light emitting module 100 .

[0149] Figure 5 In the figure, the first light L3 indicated by the solid line represents light emitted from the light source 1, passes through the vicinity of 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 the dotted line represents light emitted from the light source 1, passes through the inner side of 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.

[0150] Figure 5 As shown, the second light L4 is diffused by the second region 312, so that the stray light from the light inside the effective outer edge G1 of the effective portion 21 in the lens 2 or the light source passing through the outer lens portion 22 is reduced. As a result, in the light-emitting module 100, the stray light contained in the irradiation light from the light-emitting module 100 can be reduced. Moreover, the light can be irradiated to the desired area, and the light irradiated to areas other than the desired area can be reduced. In addition, by providing the second region 312 in a manner overlapping with the multiple concentric circular protrusions in the outer lens portion 22 when viewed from above, the multiple concentric circular protrusions are less visible when the light-emitting module 100 is observed from the +Z side of the upper surface 31u of the cover member 3. As a result, the aesthetic appearance of the light-emitting module 100 can be improved.

[0151] Figure 3 As shown, in the light emitting module 100, the light source 1 has a light emitting area 16 including nine light emitting surfaces 11. Figure 6 As shown, let the focal length of the lens 2 be f, and let the shortest distance from the focal point F of the lens 2 to the lower surface 31d of the cover member 3 on the optical axis 20 of the lens 2 be d. Figure 3 As shown, 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 defined as D. Figure 3 and Figure 6In the example shown, nine light-emitting sections 10 are arranged in a 3×3 array, and the light-emitting region 16 is a substantially square. Therefore, the longest distance D is the distance from the center C of the central (row 2, column 2) light-emitting section 10 to the corner of the square at the outer edge G2 of the light-emitting region 16. The maximum width W of the first region 311 along the lower surface 31d of the cover member 3 is expressed by the following formula.

[0152] W≥2×D×d / f

[0153] In addition, the shortest distance d from the focal point F of the lens 2 on the optical axis 20 of the lens 2 to the bottom surface 31d of the covering member 3 refers to the distance from the focal point F on the straight line connecting the center C of the light-emitting area 16 with the focal point F of the lens 2 to the bottom surface 31d.

[0154] With the above configuration, stray light originating from light passing through the outer lens portion 22 of the lens 2 or light passing near the effective outer edge G1 of the effective portion 21 is reduced due to the light diffusion effect of the second region 312. Thus, in the light-emitting module 100, stray light included in the irradiated light from the light-emitting module 100 can be reduced. Furthermore, light can be irradiated to a desired area, and light irradiated to areas other than the desired area can be reduced. Furthermore, the first light L1 emitted from the light source 1 and passing through the effective portion 21 of the lens 2 passes inside the first region 311 of the cover member 3 and is therefore less susceptible to light diffusion within the cover member 3, allowing light to be irradiated to the desired area.

[0155] (Other Examples of Covering Member 3)

[0156] Figure 7 It is a schematic bottom view showing another example of the covering member 3 . Figure 7 In the example shown, a plurality of protrusions 61 are provided on the lower surface 31d of the cover member 3 in the second region 312. Figure 7 In the example shown, the plurality of protrusions 61 are arranged concentrically at approximately equal intervals about the center Q of the first region 311. The plurality of protrusions 61 have a sawtooth or wavy shape. The concentric protrusions may be, for example, a Fresnel shape. Figure 7In the example shown, the plurality of protrusions 61 includes four protrusions 61, but the number of protrusions 61 can be varied as appropriate. For example, the light diffusivity of the second region can be adjusted by increasing the number of protrusions 61 to improve light diffusivity or decreasing the number of protrusions 61 to reduce light diffusivity. Furthermore, if the protrusions 61 have an inclined surface relative to the optical axis 20 of the lens 2, the angle of the inclined surface can be adjusted. In this embodiment, an inclined surface refers to a plane or a curved surface that has an inclination angle relative 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 protrusions 61 can have, for example, a Fresnel shape. Alternatively, at least one protrusion 61 can be provided on the lower surface 31d of the cover member 3 in the second region 312, forming a spiral-shaped protrusion 61 that surrounds the entire circumference of the first region 311 when viewed from above. The spiral-shaped protrusion 61 includes a curve that, when viewed from above, moves away from the center Q of the first region 311 as it rotates. The spiral convex portion 61 has a sawtooth or wavy shape in a cross-sectional view along the Z axis passing through the center Q of the first region 311. Even when the lower surface 31d of the cover member 3 in the second region 312 has the convex portion 61, the light-emitting module 100 can achieve the same functional effects as when the lower surface 31d of the cover member 3 in the second region 312 has a rough surface.

[0157] [Second embodiment]

[0158] Next, a light emitting module according to a second embodiment will be described. The same names and symbols as those in the previously described embodiments represent the same or homogeneous components or structures, and detailed descriptions thereof will be omitted as appropriate. This also applies to the following embodiments.

[0159] Figure 8 It is a schematic bottom view showing a first example of the covering member 3 a included in the light emitting module according to the second embodiment.

[0160] The light emitting module according to the second embodiment is different from the first embodiment in that the second region 312 in the cover member 3 a has high light diffusivity from the inside to the outside of the second region 312 in a plan view.

[0161] Figure 8 In the first example shown, multiple protrusions 61 are provided on the lower surface 31d of the cover member 3a in the second region 312. Furthermore, the multiple protrusions 61 are arranged concentrically around the center Q of the first region 311. A first spacing p1 is the distance between adjacent protrusions 61 in the radial direction of the concentric circles. Within the multiple protrusions 61, the first spacing p1 gradually decreases as they move from the inside toward the outside of the second region 312 when viewed from above. Figure 8In the example shown, first interval p1 includes first intervals p11 and p12. First interval p12 is located outside first interval p11 in a plan view. First interval p12 is narrower than first interval p11. By gradually narrowing first interval p1 from the inside toward the outside of second region 312 in a plan view, light diffusivity gradually increases from the inside toward the outside of second region 312 in cover member 3a.

[0162] In the light-emitting module according to the second embodiment, the light diffusivity of the second region 312 is improved as the light is diffused from the inside toward the outside of the second region 312 in a plan view, thereby making the boundary between the first region 311 and the second region 312 in the cover member 3a less distinct (fuzzy). This improves the aesthetic appearance of the cover member 3a and the aesthetic appearance of the light-emitting module according to the second embodiment.

[0163] Furthermore, for example, if errors occur 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 area during the manufacturing process of the light-emitting module, it may sometimes help a portion of the partially irradiated light pass through the second area close to the first area. In this case, in the light-emitting module according to the second embodiment, the light diffusivity of the second area 312 close to the first area 311 is lower than that of the second area 312 far from the first area 311, thereby reducing optical losses caused by light diffusion. In addition, Figure 8 In the first example shown, the plurality of convex portions 61 includes eight convex portions 61 , but the number of the plurality of convex portions 61 can be changed as appropriate.

[0164] Figure 9 It is a schematic bottom view showing a second example of the covering member 3 a included in the light emitting module according to the second embodiment.

[0165] Figure 9 The second example shown differs from the first example in that the plurality of protrusions 61 are radially arranged about the center Q of the first region 311. The second spacing p2 is the spacing between adjacent protrusions 61 in the circumferential direction of the annular second region 312. In the plurality of protrusions 61, the second spacing p2 gradually decreases from the inside toward the outside of the second region 312 when viewed from above. Figure 9 In the example shown, the second interval p2 includes second intervals p21 and p22. Second interval p22 is located further outward than second interval p21 in a plan view. Second interval p22 is narrower than second interval p21. Since second interval p2 narrows as viewed from the inside toward the outside of the second region 312 in a plan view, light diffusivity increases from the inside toward the outside of the second region 312 in the cover member 3a.

[0166] Even in the configuration of the second example in which the plurality of protrusions 61 are radially arranged with the center Q of the first region 311 as the center, the plurality of protrusions 61 increase in size from the inner side toward the outer side of the second region 312 in a plan view, thereby improving the light diffusivity of the second region 312, thereby achieving the same effects as those of the first example. The number of the plurality of protrusions 61 can be appropriately changed.

[0167] Furthermore, in the light emitting module according to the second embodiment, the surface roughness of the rough surface provided in the second region 312 increases from the inner side toward the outer side of the second region 312 in the cover member 3a when viewed from above, thereby also improving the light diffusibility of the second region 312.

[0168] The operations and effects other than those described above in the light emitting module according to the second embodiment are the same as those of the first embodiment.

[0169] [Third embodiment]

[0170] Next, a light emitting module according to a third embodiment will be described.

[0171] <Configuration Example of Light-Emitting Module According to Third Embodiment>

[0172] Figure 10 1 is a schematic cross-sectional view showing an example of a light emitting module 100b according to the third embodiment. The top view of the light emitting module 100b is similar to that of the embodiment 1 except for the shape of the lens 2. Figure 1 same. Figure 10 A schematic cross-sectional view of Figure 1 The cross section of the light emitting module 100b corresponding to the II-II line is shown below. Figures 11 to 13 The same is true for each cross-sectional view.

[0173] The light-emitting module 100b further includes a support portion 32b that supports the covering member 3. The covering member 3 and the support portion 32b constitute a molded body that is directly joined at their respective interfaces. The covering member 3 is light-transmissive. The support portion 32b is light-shielding. In addition, in the light-emitting module 100b, the outer lens portion 22 includes a plurality of concentric circular protrusions centered on the optical axis 20 of the lens 2 on the light incident surface serving as the lower surface of the lens 2. The plurality of concentric circular protrusions provided on the light incident surface of the outer lens portion 22 have a sawtooth or wavy shape. The plurality of concentric circular protrusions may be, for example, a Fresnel shape. Figure 10In the example shown, when viewed from above, the multiple concentric circular convex portions provided on the light emitting surface of the outer lens portion 22 overlap the multiple concentric circular convex portions provided on the light incident surface of the outer lens portion 22. These aspects of the light emitting module 100b are different from those of the first embodiment. In addition, in this embodiment, the molded bodies that are directly joined at their respective interfaces are, for example, two-color molded bodies. A two-color molded body refers to a structure manufactured by a two-color molding process. In addition, the multiple concentric circular convex portions in the outer lens portion 22 can be provided on at least one of the light incident surface and the light emitting surface.

[0174] Figure 10 In the example shown, 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 formed of a resin material containing light-transmitting properties. The support portion 32b is formed of a resin material containing a light-reflecting substance such as a white pigment or a light-absorbing substance such as a black pigment. The support portion 32b is arranged on the side of the wiring substrate 5 via an adhesive member, etc., so that the side surface of the support portion 32b faces the side surface of the wiring substrate 5. The support portion 32b supports the cover member 3 so that the cover member 3 is arranged above the lens 2.

[0175] In the light-emitting module 100b, the cover member 3 and the support portion 32b are integrally formed as a molded body directly bonded at their respective interfaces, thereby reducing the number of components comprising the light-emitting module 100b. This simplifies the structure of the light-emitting module 100b and facilitates its manufacture. Furthermore, in the light-emitting module 100b, by utilizing the light-transmissive cover member 3 and the light-shielding support portion 32b to form a molded body directly bonded at their respective interfaces, it is possible to reduce the amount of external light entering the interior of the light-emitting module 100b through the support portion 32b.

[0176] The operations and effects of the light emitting module 100 b other than those described above are the same as those of the first embodiment.

[0177] [Fourth embodiment]

[0178] Next, a light emitting module according to a fourth embodiment will be described. Figure 11 It is a schematic cross-sectional view showing an example of a light emitting module 100 c according to the fourth embodiment.

[0179] The light-emitting module 100c is different from the first embodiment in that the light source 1 has a light-emitting portion 10; the lens 2 does not have an outer lens portion outside the effective portion 21; and it has electronic components 8 such as a driving circuit, an electrostatic corresponding element, a temperature sensor, and a photodiode of the light source 1.

[0180] Figure 11 In the example shown, the electronic component 8 is positioned above the wiring substrate 5, between the light source 1 and the leg 23. Furthermore, when viewed from above, the second region 312 overlaps the electronic component 8. By including the second region 312 in the cover member 3 and positioning the electronic component 8 below it, the electronic component 8 and other components positioned on the wiring substrate 5 are less visible when viewing the light-emitting module 100c from the +Z side of the upper surface 31u of the cover member 3. This improves the aesthetic appearance of the light-emitting module 100c. Furthermore, the light-emitting module 100c can achieve the effect of reducing stray light on the illuminated surface and the effect of irradiating light to a desired area.

[0181] The operations and effects of the light emitting module 100 c other than those described above are the same as those of the first embodiment.

[0182] [Fifth embodiment]

[0183] Next, a light emitting module according to a fifth embodiment will be described. Figure 12 It is a schematic cross-sectional view showing an example of a light emitting module 100d according to the fifth embodiment.

[0184] The light-emitting module 100d further includes a support portion 32b for supporting 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 provided around the first cover portion 31a and including 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 constitute a molded body that is directly bonded at their respective interfaces. The light-emitting module 100d further includes a support portion 32 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 below the support portion 32 of the cover member 3. The side surface of the support portion 32b faces the side surface of the wiring substrate 5 and is arranged on the side surface of the wiring substrate 5 via an adhesive member or the like. The covering member 3 including the first covering portion 31a and the second covering portion 31b and the support portion 32b constitute a molded body directly bonded at their respective interfaces. The covering member 3 is light-transmissive. The support portion 32b is light-shielding. These aspects of the light-emitting module 100d are different from those of the first embodiment. In addition, in this embodiment, the molded body including the first covering portion 31a, the second covering portion 31b, and the support portion 32b, whose respective interfaces are directly bonded, is, for example, a three-color molded body. A three-color molded body refers to a structure manufactured by a three-color molding process.

[0185] Figure 12In the example shown, 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. Furthermore, the first cover portion 31a and the second cover portion 31b are connected via a second boundary 34.

[0186] Figure 12 In the example shown, the first region 311 is made of a light-transmitting resin material that does not contain a light-diffusing substance. The second region 312 is made of a light-transmitting resin material that contains a light-diffusing substance. The support portion 32b is made of a light-reflecting resin material such as a white pigment or a light-absorbing material such as a black pigment. The support portion 32b is positioned on the side of the wiring substrate 5 via an adhesive member. The support portion 32b supports the cover member 3 so that the cover member 3 is positioned above the lens 2.

[0187] In the light-emitting module 100d, the covering member 3, which includes the first covering portion 31a including the first region 311 and the second covering portion 31b including the second region 312, and the supporting portion 32b are integrally formed as a molded body directly bonded at their respective interfaces. This reduces the number of components comprising the light-emitting module 100d. This simplifies the structure of the light-emitting module 100d and facilitates its manufacture. Furthermore, the light-emitting module 100d includes the light-shielding supporting portion 32b, which reduces the amount of external light entering the interior of the light-emitting module 100d through the supporting portion 32b.

[0188] The operations and effects of the light emitting module 100d other than those described above are the same as those of the first embodiment.

[0189] [Sixth embodiment]

[0190] Next, a light emitting module according to a sixth embodiment will be described. Figure 13 It is a schematic cross-sectional view showing an example of a light emitting module 100e according to the sixth embodiment.

[0191] The light emitting module 10Oe is different 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 into a groove around the support portion 32 in the circumferential direction.

[0192] In the light-emitting module 100e, a sealing member for tightly fitting the light-emitting module 100e to the smartphone housing is embedded in the recess 35, enabling installation. The sealing member is a ring-shaped member formed from an elastic material such as natural rubber or synthetic rubber. When the light-emitting module 100e is fixed to the smartphone housing with the sealing member installed in the recess 35, the sealing member provides a seal that reduces the intrusion of dust, liquid, etc., into the smartphone through the gap between the light-emitting module 100e and the smartphone housing.

[0193] The operations and effects of the light emitting module 100e other than those described above are the same as those of the first embodiment.

[0194] 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.

[0195] The numbers, such as ordinal numbers and quantities, used in the description of the embodiments are all examples for the purpose of specifically illustrating the technology of the present disclosure, and the present disclosure is not limited to the numbers shown. In addition, the connection relationships between the components are illustrated to specifically illustrate the technology of the present disclosure, and the connection relationships that realize the functions of the present disclosure are not limited to these examples.

[0196] The light emitting module of the present disclosure can reduce stray light on the illuminated surface and is therefore suitable for use in lighting, camera flashes, vehicle headlights, etc. However, the light emitting module of the present disclosure is not limited to these applications.

[0197] The embodiments of the present disclosure are as follows, for example.

[0198] <Item 1> A light-emitting module comprising: a light source, a lens arranged on the light source, which transmits light from the light source, a covering member arranged on the lens and including a lower surface for light incidence and an upper surface for light emission, the lower surface of the covering member including a first area for light from the light source passing through the lens being incident, and a second area provided around the first area and having a higher light diffusivity than the first area, the upper surface of the covering member being covered with a light-transmitting member having a higher hardness than the covering member.

[0199] <Item 2> According to the light-emitting module described in <Item 1> above, the light source has a light-emitting area including at least one light-emitting surface, and when the focal length of the lens is set to f, the shortest distance from the focus of the lens on the optical axis of the lens to the bottom of the covering member is set to d, and the longest distance from the center of the light-emitting area to the outer edge of the light-emitting area in the direction along the light-emitting surface is set to D, the maximum width W of the first area in the direction along the bottom of the covering member is expressed by the following formula: W≥2×D×d / f.

[0200] <Item 3> The light emitting module according to <Item 1> or <Item 2>, wherein the light diffusibility of the second region increases from the inner side toward the outer side of the second region in a plan view.

[0201] <Item 4> The light emitting module according to any one of <Item 1> 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.

[0202] <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.

[0203] <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 concentrically or radially.

[0204] <Item 7> The light-emitting module according to any one of <Item 1> to <Item 6>, further comprising a support portion that supports the covering member, the covering member and the support portion forming a molded body that are directly bonded at their respective interfaces, the covering member having light-transmitting properties, and the support portion having light-shielding properties.

[0205] <Item 8> According to the light-emitting module described in any one of <Item 1> to <Item 7>, the covering member comprises: a first covering portion including the first area, and a second covering portion arranged around the first covering portion and including the second area, the first covering portion and the second covering portion constituting a molded body that is directly bonded at their respective interfaces.

[0206] <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 lower surface of the cover member in the second region.

[0207] <Item 10> The light emitting module according to any one of <Item 1> to <Item 9>, wherein a light diffusing material is contained in an interior of the cover member overlapping the second region in a plan view.

[0208] <Item 11> The light emitting module according to any one of <Item 1> to <Item 10>, wherein the lens includes a convex lens.

[0209] <Item 12> In the light-emitting module according to any one of <Item 1> to <Item 11>, the lens has an outer lens portion including a plurality of concentric convex portions on at least one of the light incident surface and the light exit surface, and the outer lens portion overlaps with the second region when viewed from above.

[0210] <Item 13> The light emitting module according to any one of <Item 1> to <Item 12>, wherein the cover member includes a recessed portion on an outer side surface.

[0211] <Item 14> According to the light-emitting module described in any one of <Item 1> to <Item 13>, the light source comprises a plurality of light-emitting parts, and the light from each of the plurality of light-emitting parts after passing through the lens illuminates an area on the opposite side of the position of each of the plurality of light-emitting parts with a point on the optical axis of the lens as the center.

[0212] <Item 15> According to the light-emitting module described in any one of <Item 1> to <Item 14>, the light source has at least one light-emitting portion, the light-emitting portion has a light-emitting element, a wavelength conversion component arranged on the light-emitting element, and a shading component respectively covering the side surfaces of the light-emitting element and the side surfaces of the wavelength conversion component.

[0213] <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 shielding member integrally holds the plurality of light emitting elements and the plurality of wavelength conversion members.

[0214] <Item 17> The light emitting module according to any one of <Item 1> to <Item 16>, wherein the light emitting module is for flashing.

[0215] <Item 18> A covering structure comprising a lens, and a covering member arranged on the lens and comprising a bottom and a top, wherein the bottom of the covering member comprises a first region and a second region arranged around the first region and having a higher light diffusivity than the first region, and the top of the covering member is covered by a light-transmitting member having a harderness than that of the covering member.

[0216] <Item 19> The covering structure according to <Item 18>, wherein the light diffusibility of the second region increases from the inner side toward the outer side of the second region in a plan view.

[0217] <Item 20> The covering structure according to <Item 18> or <Item 19>, wherein the lower surface of the covering member in the second region is provided with at least one of a rough surface and one or more protrusions.

[0218] <Item 21> The covering structure according to <Item 20>, wherein the one or more convex portions are a plurality of convex portions, and the plurality of convex portions are arranged concentrically or radially.

[0219] <Item 22> The covering structure according to any one of <Item 18> to <Item 21>, wherein a light diffusing material is disposed on the lower surface of the covering member in the second region.

[0220] <Item 23> The covering structure according to any one of <Item 18> to <Item 22>, wherein a light diffusing substance is contained in an interior of the covering member overlapping with the second region in a plan view.

Claims

1. A light emitting module, comprising: 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 for light incidence and an upper surface for light emission, The lower surface of the cover member includes a first region where 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 diffusivity than the first region. The upper surface of the covering member is covered with a light-transmitting member having a higher hardness than the covering member.

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

3. The light emitting module according to claim 1 or 2, The light diffusibility of the second region increases as it moves from the inside to the outside of the second region in a plan view.

4. The light emitting module according to claim 1 or 2, At least one of a rough surface and one or more protrusions is provided on the lower surface of the covering member in the second region.

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

6. The light emitting module according to claim 4, The one or more convex portions are a plurality of convex portions, and the plurality of convex portions are arranged concentrically or radially.

7. The light emitting module according to any one of claims 1 to 6, It further comprises a support portion for supporting the covering member, The covering member and the supporting portion constitute a molded body that is directly joined at their respective interfaces. The covering member has light transmissivity, The support portion has a light-shielding property.

8. The light emitting module according to any one of claims 1 to 7, The covering member includes: a first covering portion including the first region, and a second covering portion provided around the first covering portion and including the second region. The first covering portion and the second covering portion constitute a molded body that is directly bonded at respective interfaces.

9. The light emitting module according to any one of claims 1 to 8, A light diffusing material is disposed on the lower surface of the covering member in the second region.

10. The light emitting module according to any one of claims 1 to 9, In a plan view, a light diffusing substance is contained in the interior of the covering member overlapping the second region.

11. The light emitting module according to any one of claims 1 to 10, The lens includes a convex lens portion.

12. The light emitting module according to any one of claims 1 to 11, The lens has an outer lens portion including a plurality of concentrically convex portions on at least one of a light incident surface and a light emitting surface. The outer lens portion overlaps the second region in a plan view.

13. The light emitting module according to any one of claims 1 to 12, The cover member includes a recessed portion on an outer side surface.

14. The light emitting module according to any one of claims 1 to 13, The light source comprises a plurality of light emitting parts. The light from each of the plurality of light emitting units after passing through the lens illuminates a region located on the opposite side to the position of each of the plurality of light emitting units, with the point on the optical axis of the lens as the center.

15. The light emitting module according to any one of claims 1 to 14, The light source comprises at least one light emitting portion. The light emitting unit includes a light emitting element, a wavelength conversion member provided on the light emitting element, and a light shielding member covering a side surface of the light emitting element and a side surface of the wavelength conversion member, respectively.

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

17. The light emitting module according to any one of claims 1 to 16, The light emitting module is used for flashing.

18. A covering structure, comprising: lens, and A covering member disposed on the lens, comprising 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 diffusivity than the first region. The upper surface of the covering member is covered with a light-transmitting member having a higher hardness than the covering member.

19. The covering structure according to claim 18, The light diffusibility of the second region increases as it moves from the inside to the outside of the second region in a plan view.

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

21. The covering structure according to claim 20, The one or more convex portions are a plurality of convex portions, and the plurality of convex portions are arranged concentrically or radially.

22. The covering structure according to any one of claims 18 to 21, A light diffusing material is disposed on the lower surface of the covering member in the second region.

23. The covering structure according to any one of claims 18 to 22, In a plan view, a light diffusing substance is contained in the interior of the covering member overlapping the second region.

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