Light-transmitting member, light source device, method for manufacturing light-transmitting member, and method for manufacturing light source device

Abstract

Provided are a light-transmitting member, a light source device, a method for manufacturing the light-transmitting member, and a method for manufacturing the light source device, which are capable of suppressing the occurrence of damage. The translucent member has: a translucent base material provided with a first surface and a second surface positioned on the opposite side of the first surface; a translucent first film that covers the first surface; a light-transmitting second film covering the second surface, and a light-transmitting third film provided on the second film, the first film containing hydrated alumina, the second film containing alumina having a lower crystallinity than alpha alumina, and the third film having a higher hardness than the second film.

Description

Technical Field

[0001] The present disclosure relates to a light-transmitting member, a light source device, a method for manufacturing a light-transmitting member, and a method for manufacturing a light source device. Background Art

[0002] Conventionally, there is known a technique for forming a sesame-like aluminum oxide film on the entire surface of an object such as glass or a lens.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application No. 2020-537188 Summary of the invention

[0006] Problems to be solved by the invention

[0007] Conventionally, there is a concern that the sesame-like aluminum oxide film may be damaged during transportation of an object having the sesame-like aluminum oxide film formed thereon.

[0008] An object of the present disclosure is to provide a light-transmitting member, a light source device, a method for manufacturing a light-transmitting member, and a method for manufacturing a light source device that are highly reliable.

[0009] Methods for solving problems

[0010] According to one embodiment of the present disclosure, a light-transmitting component comprises: a light-transmitting substrate having a first surface and a second surface located on the opposite side of the first surface, a light-transmitting first film covering the first surface, a light-transmitting second film covering the second surface, and a light-transmitting third film disposed on the second film, wherein the first film comprises hydrated aluminum oxide, the second film comprises aluminum oxide having a lower crystallinity than α-alumina, and the hardness of the third film is higher than that of the second film.

[0011] According to another embodiment of the present disclosure, a method for manufacturing a translucent component is a method for manufacturing a translucent component having a first film, a second film and a third film, which has the following steps: a step of preparing a translucent substrate having a first surface and a second surface located on the opposite side of the above-mentioned first surface; a step of forming a translucent aluminum oxide film covering the above-mentioned first surface and the above-mentioned second surface and comprising aluminum oxide with a lower crystallinity than α-alumina; a step of forming a translucent third film on the above-mentioned aluminum oxide film on the above-mentioned second surface to obtain an intermediate structure; a step of hydrating the intermediate structure, wherein, by hydrating the above-mentioned intermediate structure, the above-mentioned aluminum oxide film becomes a first film comprising hydrated aluminum oxide arranged on the above-mentioned first surface, and a second film comprising aluminum oxide with a lower crystallinity than α-alumina arranged on the above-mentioned second surface.

[0012] Effects of the Invention

[0013] According to the present disclosure, it is possible to provide a highly reliable light-transmitting member, a light source device, a method for manufacturing a light-transmitting member, and a method for manufacturing a light source device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a cross-sectional view showing the light-transmitting member according to the first embodiment.

[0015] Figure 2 It is a cross-sectional view showing the method for manufacturing the light-transmitting member according to the first embodiment.

[0016] Figure 3 It is a cross-sectional view showing the method for manufacturing the light-transmitting member according to the first embodiment.

[0017] Figure 4 It is a plan view showing a light source device according to a second embodiment.

[0018] Figure 5 It is a cross-sectional view showing a light source device according to a second embodiment.

[0019] Figure 6 It is a diagram showing an example of arrangement of light emitting parts in a light source device according to the second embodiment.

[0020] Figure 7 for Figure 6 Cross-sectional view along line VII-VII.

[0021] Figure 8 It is a flowchart showing the manufacturing method of the light source device according to the second embodiment.

[0022] Fig. 9 It is a cross-sectional view showing a method for manufacturing the light source device according to the second embodiment.

[0023] Fig.10 It is a cross-sectional view showing a method for manufacturing the light source device according to the second embodiment.

[0024] Fig.11 It is a cross-sectional view showing a method for manufacturing the light source device according to the second embodiment.

[0025] Fig.12 It is a cross-sectional view showing a light source device according to a third embodiment.

[0026] Fig.13 It is a bottom view showing the lens and the support portion in the third embodiment.

[0027] Fig.14 It is a cross-sectional view showing a light source device according to a fourth embodiment.

[0028] Fig.15 It is a bottom view showing the lens and the support portion in the fourth embodiment.

[0029] Fig.16 It is a cross-sectional view showing a light source device according to a fifth embodiment.

[0030] Fig.17 It is a bottom view showing the lens and the support portion in the fifth embodiment.

[0031] Fig.18 This is a flow chart showing the method for preparing the third sample.

[0032] Fig.19 This is a flow chart showing the method for preparing the fourth sample. DETAILED DESCRIPTION

[0033] Hereinafter, embodiments for implementing the present disclosure will be described with reference to the accompanying drawings. The following description is for the purpose of concretely describing the technical concept of the present disclosure, and the present disclosure is not limited to the following description unless otherwise specified.

[0034] In the drawings, components with the same function are sometimes marked with the same reference numerals. For the convenience of description or understanding of the main points, they can be divided into implementation modes, but the configurations shown in different implementation modes or examples can be partially replaced or combined. In the implementation modes described later, matters different from the above-mentioned implementation modes are mainly described, and repeated descriptions of matters common to the above-mentioned implementation modes can sometimes be omitted. For the purpose of clear description, the size, positional relationship, etc. of the components shown in the drawings are sometimes exaggerated. As a cross-sectional view, an end view that only shows a cut section is sometimes used.

[0035] Of the first and second surfaces of the translucent member according to the embodiment, the first surface corresponds to the "lower side", the second surface corresponds to the "upper side", the direction toward which the first surface faces is set as the "lower side", and the direction toward which the second surface faces is set as the "upper side". The same is true for other components according to the embodiment regarding such a top-bottom positional relationship. However, these do not limit the orientation of the translucent member and the light source device according to the embodiment when in use.

[0036] In addition, in the present specification or claims, when there are multiple constituent elements, in order to distinguish each of them, the beginning of the constituent element may be annotated with "first", "second", etc. to distinguish them. In addition, the objects used to distinguish the present specification and the claims may be different. Therefore, even if the claims record constituent elements with the same annotated elements as the present specification, the objects specified by the constituent elements may not be consistent between the present specification and the claims.

[0037] 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 constituent elements annotated as "1st" and constituent elements without specific ordinal numbers are recorded in the claims, from the perspective of easy observation, in the claims, "1st" and "2nd" are sometimes annotated to distinguish constituent elements. In this case, in the claims, constituent elements annotated as "1st" and "2nd" refer to constituent elements annotated as "1st", "3rd", or constituent elements without specific ordinal numbers 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.

[0038] <First embodiment>

[0039] A first embodiment will be described. The first embodiment relates to a light-transmitting member.

[0040] [Structure of the light-transmitting member according to the first embodiment]

[0041] First, the structure of the light-transmitting member according to the first embodiment will be described. Figure 1 It is a cross-sectional view showing the light-transmitting member according to the first embodiment.

[0042] The light-transmitting member 100 according to the first embodiment comprises a light-transmitting substrate 110, a light-transmitting first film 111, a light-transmitting second film 112, and a light-transmitting third film 113. The light-transmitting property here refers to the property of being able to transmit more than 60% of the incident light. The substrate 110 comprises a first surface 110A and a second surface 110B located on the opposite side of the first surface 110A. The first film 111 covers the first surface 110A. The second film 112 covers the second surface 110B. The third film 113 is provided on the second film 112.

[0043] In this embodiment, the first film 111 covers the entire first surface 110A, and the second film 112 covers the entire second surface 110B. The first film 111 is in contact with the first surface 110A, the second film 112 is in contact with the second surface 110B, and the third film 113 is in contact with the second film 112 and covers the entire second surface 110B from the second film 112. In addition, the first film 111 only needs to cover at least a portion of the first surface 110A, and the second film 112 only needs to cover at least a portion of the second surface 110B.

[0044] The substrate 110 is light-transmissive, for example, it is made of a transparent resin such as polycarbonate resin, acrylic resin, silicone resin, epoxy resin, or glass. The first film 111 contains hydrated aluminum oxide (hydrated aluminum oxide). The composition of hydrated aluminum oxide is represented by Al2O3・nH2O (0<n≤3). The first film 111 can be a hydrated aluminum oxide film. In the present embodiment, the first film 111 forms a sesame-like appearance with fine concave and convex. The second film 112 contains aluminum oxide having a lower crystallinity than α-alumina. The second film 112 can be an aluminum oxide film having a lower crystallinity than α-alumina. The hardness of the third film 113 is higher than that of the second film 112. The "hardness" in the present disclosure is "Vickers hardness". The third film 113, for example, contains silicon oxide. The third film 113 can be a silicon oxide film.

[0045] The hydrated aluminum oxide of the present embodiment includes fine concavoconvexities. By disposing the hydrated aluminum oxide of the present embodiment between two media having different refractive indices, a gradual change (including a linear or curved change) between the respective refractive indices of the two media can be achieved, and the transmittance of light passing through the two media can be increased. In the present embodiment, the two media are the substrate 110 and the air, respectively. Therefore, by including the first film 111 of hydrated aluminum oxide, the reflection of light in the first surface 110A can be reduced.

[0046] The height of the convex part of the hydrated aluminum oxide contained in the first film 111 is less than the wavelength of the transmitted light in the fine concavo-convex. In addition, the separation distance between adjacent convex parts of the hydrated aluminum oxide contained in the first film 111 is less than the wavelength of the transmitted light in the fine concavo-convex. The thickness of the first film 111 is preferably not less than 200nm and not more than 300nm. Thus, it is easy to transmit the visible light described later. The thickness of the second film 112 is not limited, and the thickness of the second film 112 is preferably not less than 25nm and not more than 45nm. Thus, the transmittance of visible light can be improved. The thickness of the third film 113 is preferably not less than 80nm and not more than 135nm. Thus, the transmittance of visible light can be improved.

[0047] In addition, a light-transmitting film including silicon oxide or the like may be provided between the first film 111 and the substrate 110. Furthermore, a light-transmitting film including silicon oxide or the like may be provided on the first film 111. The light-transmitting film including silicon oxide or the like protects the first film 111, thereby reducing the decrease in light transmittance due to changes in the surface state or properties of the first film 111 in a high temperature and high humidity environment, for example.

[0048] [Method for Manufacturing Light-Transmitting Member According to First Embodiment]

[0049] Next, a method for manufacturing the light-transmitting member 100 according to the first embodiment will be described. Figure 2 and Figure 3It is a cross-sectional view showing the method of manufacturing the light-transmitting member 100 according to the first embodiment.

[0050] The manufacturing method of the translucent component 100 involved in the first embodiment is a manufacturing method of a translucent component having a first film 111, a second film 112 and a third film 113, comprising: a process of preparing a translucent substrate 110, a process of forming a translucent aluminum oxide film 112X, a process of obtaining an intermediate structure 114, and a process of hydrating the intermediate structure 114.

[0051] First, a process of preparing a light-transmitting substrate 110 is performed. In the process of preparing the light-transmitting substrate 110, Figure 2 As shown in the figure, a light-transmitting substrate 110 having a first surface 110A and a second surface 110B is prepared. In the present embodiment, the first surface 110A and the second surface 110B are flat surfaces. At least one of the first surface 110A and the second surface 110B may be a rough surface, and may include at least one of a concave surface or a convex surface. At least one of the first surface 110A and the second surface 110B is a rough surface, and the greater the surface roughness, the higher the transmittance of light brought by the first film 111.

[0052] Next, a process of forming a translucent aluminum oxide film 112X is performed. The process of forming the translucent aluminum oxide film 112X is to form a translucent aluminum oxide film 112X containing aluminum oxide with a lower crystallinity than α-alumina in a manner covering the first surface 110A and the second surface 110B of the substrate 110. The aluminum oxide film 112X can be formed, for example, by an atomic layer deposition (ALD) method. The film formation temperature is, for example, 80°C to 100°C. The aluminum oxide film 112X formed at about 100°C by the ALD method contains aluminum oxide with a lower crystallinity than α-alumina. The aluminum oxide film 112X may contain amorphous aluminum oxide. As aluminum oxide with a lower crystallinity than α-alumina, for example, γ-alumina can be cited.

[0053] Next, a process of obtaining the intermediate structure 114 is performed. The process of obtaining the intermediate structure 114 is as follows: Figure 3As shown, a translucent third film 113 is formed on the aluminum oxide film 112X of the second surface 110B. The third film 113 can be formed, for example, by a sputtering method or an evaporation method. According to the sputtering method, film formation can be performed at a temperature above room temperature, and according to the evaporation method, film formation can be performed at a temperature above about 80°C. Therefore, the film formation temperature of the third film 113 is above room temperature (about 30°C) and below 100°C. In the formation of the third film, for example, when the ALD method is used, a flat and dense film can be formed at the atomic layer level, and the third film is formed on both the first surface and the second surface. Therefore, it is necessary to configure a mask on the first surface, etc., and the film forming process becomes complicated. In the present embodiment, the third film 113 is formed in the desired area (i.e., only the second surface 110B) by using a sputtering method or an evaporation method. The intermediate structure 114 thus obtained includes the substrate 110, the aluminum oxide film 112X provided on the first surface 110A of the substrate 110, the aluminum oxide film 112X provided on the second surface 110B of the substrate 110, and the third film 113 provided on the aluminum oxide film 112X on the second surface 110B.

[0054] Next, a process of hydrating the intermediate structure 114 is performed. In this process, the intermediate structure 114 is hydrated. In the process of hydrating the intermediate structure 114, it is preferred that the hardness of the third film 113 is higher than the hardness of the second film 112. The hydration treatment is, for example, exposing the intermediate structure 114 to water containing liquid or water vapor at a temperature of 70°C to 100°C. Through the hydration treatment, hydrated aluminum oxide is generated from the aluminum oxide contained in the aluminum oxide film 112X provided on the first surface 110A. In addition, the aluminum oxide may contain aluminum hydroxide (AlO(OH)). During the hydration treatment, for example, the following chemical changes occur.

[0055] Al2O3+H2O→2AlO(OH)・・・(1)

[0056] 2AlO(OH)→Al2O3・H2O・・・(2)

[0057] 2AlO(OH)+2H2O→Al2O3・3H2O・・・(3)

[0058] Al2O3+nH2O→Al2O3・nH2O(n=1.4~3)・・・(4)

[0059] The chemical changes of (1) and (2) are easy to occur when the temperature of water or water vapor is 80°C or above, and in the chemical reaction of (2), boehmite (monohydrated aluminum oxide) is generated. 2AlO(OH) generated by (1) may also exist. The chemical change of (3) is easy to occur when the temperature of water or water vapor is less than 80°C, and in the chemical reaction of (3), bayerite (trihydrated aluminum oxide) is generated. In the chemical reaction of (4), pseudo-boehmite (n-hydrated aluminum oxide) is generated. Therefore, at least a part of the aluminum oxide contained in the aluminum oxide film 112X is converted into hydrated aluminum oxide through the hydration treatment process. It is believed that the hydrated aluminum oxides (2), (3) and (4) generated by the hydration treatment contain Al2O3・nH2O (1≤n≤3). In addition, it is believed that the hydrated aluminum oxides (1), (2), (3) and (4) generated by the hydration treatment contain Al2O3・nH2O (0<n≤3).

[0060] On the other hand, the aluminum oxide film 112X disposed on the second surface 110B is covered by the third film 113 having a thickness of 80 nm to 135 nm, and is therefore not easily affected by the hydration treatment. The intermediate structure 114 is subjected to the hydration treatment, so that the aluminum oxide film 112X becomes the first film 111 including hydrated aluminum oxide disposed on the first surface 110A, and the second film 112 including aluminum oxide having a lower crystallinity than α-alumina disposed on the second surface 110B.

[0061] This operation can produce Figure 1 The light-transmitting member 100 is shown.

[0062] The light-transmitting member 100 of the present embodiment is configured with different films through the first surface 110A and the second surface 110B of the substrate 110. The first film 111 including hydrated aluminum oxide is fragile, so if a fixture such as a suction nozzle is in contact with the first film 111 to transport the light-transmitting member 100, there is a possibility that the first film 111 is damaged. In the embodiment of the present disclosure, the third film 113 having a higher hardness than the first film 111 including hydrated aluminum oxide is configured on the second surface 110B side, so that a fixture such as an adsorption nozzle is in contact with the third film 113 to transport the light-transmitting member 100, thereby reducing the damage to the first film 111. Furthermore, the hardness of the third film 113 is higher than that of the second film 112, so that the occurrence of damage in the second film 112 can also be reduced. In addition, in the present embodiment, the thermal expansion coefficients of the substrate 110, the second film 112, and the third film 113 are reduced in the order of the substrate 110, the second film 112, and the third film 113. For example, the substrate 110 includes a polycarbonate resin, the second film 112 includes aluminum oxide, and the third film 113 includes silicon oxide. In this way, as the distance from the substrate 110 increases, the thermal expansion coefficient of the film formed on the second surface 110B of the substrate 110 decreases, thereby reducing the peeling of the film from the substrate 110. Furthermore, the second surface 110B of the substrate 110 is arranged in contact with each other in the order of the second film 112 and the third film 113, so that the refractive index of the film decreases step by step, thereby reducing the reflection of light and making it possible to make a film with a close optical design.

[0063] <Second embodiment>

[0064] Next, a second embodiment will be described. The second embodiment relates to a light source device.

[0065] [Structure of Light Source Device According to Second Embodiment]

[0066] First, the structure of a light source device according to a second embodiment will be described. Figure 4 It is a plan view showing a light source device according to a second embodiment. Figure 5 It is a cross-sectional view showing a light source device according to a second embodiment. Figure 6 This is a diagram showing an example of the configuration of the light-emitting portion in the light source device according to the second embodiment. The second embodiment is different from the first embodiment in that the substrate of the first light-transmitting member in the light source device includes a first lens. The light source device 200 is mounted on a smartphone as an example, and is a light source device for flash provided in a camera device of the smartphone. The camera device includes a camera for shooting still images, a video camera for shooting animations, and the like.

[0067] The light source device 200 according to the second embodiment is as follows Figures 4 to 6As shown, there is a light source 10 including a light emitting unit 1 and a first light transmissive member 201. The first light transmissive member 201 includes a substrate 210 including a first lens 11 and a first supporting portion 25. The first supporting portion 25 is disposed around the first lens 11 to support the first lens 11. The first lens 11 includes a first surface 210A and a second surface 210B located on the opposite side of the first surface 210A. In the present embodiment, the first surface 210A and the second surface 210B of the first lens 11 include convex surfaces, respectively. The first lens 11 may include two convex lenses. In the present embodiment, the light emitting unit 1 includes a plurality of light emitting units 1a to 1i, and the first surface 210A is disposed opposite to the light emitting units 1a to 1i. In the following description, the light emitting units 1a to 1i are sometimes collectively referred to as the light emitting unit 1. The first lens 11 has an incident portion 12A on a first surface 210A of the first lens 11, where light from the light emitting portion 1 is incident, and an exit portion 12B on a second surface 210B of the first lens 11, where light passing through the first lens 11 is exited. The first lens 11 may further have a light guide portion 21 disposed so as to include the entire circumference of the incident portion 12. The light guide portion 21 guides the light incident from the incident portion 12.

[0068] The light source device 200 may further include a substrate 41, a second light-transmitting member 202, and a third support portion 51. The second light-transmitting member 202 includes a second lens 31 and a second support portion 38. The substrate 41 is mounted with the light-emitting unit 1. The third support portion 51 is disposed around the first light-transmitting member 201 and the second light-transmitting member 202. The second light-transmitting member 202 is supported by the third support portion 51 on the first light-transmitting member 201 in a manner overlapping with the first light-transmitting member 201 when viewed from above. For example, the first support portion 25 is fixed to the substrate 41 by an adhesive member 61A. The third support portion 51 is fixed to the first light-transmitting member 201 by an adhesive member 61B, and is fixed to the substrate 41 by an adhesive member 61C. The third support portion 51 includes a circular opening portion 52 that overlaps with the first lens 11 of the first light transmissive member 201 in a plan view. The second light transmissive member 202 is fixed to the third support portion 51 by being disposed in the opening portion 52 .

[0069] Figure 6 As shown, the light-emitting units 1a to 1i are arranged in a square grid shape of 3 rows and 3 columns. In the present embodiment, the light-emitting units 1a to 1i are arranged at equal intervals vertically and horizontally, but the arrangement of the light-emitting unit 1 is not limited to this. In addition, the number of light-emitting units is not limited to 9, as long as it is 1 or more. In the case where there are multiple light-emitting units 1, they can be arranged in a square grid shape or a rectangular grid shape of 1 row and 2 columns or more. In addition, in the case where there are multiple light-emitting units 1, the light-emitting units 1 can be controlled to light up individually or in groups.

[0070] In the light source device 200, the first lens 11 has an optical axis C1. In the present embodiment, when viewed from above, the optical axis C1 of the first lens 11 is located at a position overlapping with the light-emitting portion 1e located at the center of the light-emitting portions 1a to 1i. That is, the light source device 200 has the light-emitting portion 1 and the first light-transmitting member 201 arranged in the path of the light emitted by the light-emitting portion 1. In addition, in the light source device 200, the second lens 31 has an optical axis C2. In the present embodiment, when viewed from above, the optical axis C2 of the second lens 31 is located at a position overlapping with the light-emitting portion 1e located at the center of the light-emitting portions 1a to 1i. In addition, it is preferred that the optical axis C1 of the first lens 11 is substantially consistent with the optical axis C2 of the second lens 31. Figure 5 In the example shown, the optical axis C1 of the first lens 11 and the optical axis C2 of the second lens 31 overlap with the center R of the light emitting portion 1 e in a plan view.

[0071] (First light-transmitting member 201)

[0072] Next, the specific structure of the first light-transmitting member 201 will be described.

[0073] In this embodiment, the first light-transmitting member 201 includes a light-transmitting substrate 210 having a first lens 11 and a first support portion 25. The substrate 210 is formed of, for example, a light-transmitting resin such as a polycarbonate resin, an acrylic resin, a silicone resin, an epoxy resin, etc. The first lens 11 is arranged on the light-emitting portion 1 in such a manner that the first surface 210A of the first lens 11 is opposite to the light-emitting surface 7. The first lens 11 focuses the light from the light-emitting portion 1 and emits it to the side of the second lens 31. As the first lens 11, for example, a collimator lens can be cited. The shape of the first lens 11 is preferably circular or elliptical when viewed from above, and can be a polygon such as a quadrilateral or a hexagon. In this embodiment, the first light-transmitting member 201 includes the first lens 11, the light-transmitting first film 211 covering the first surface 210A of the first lens 11, the light-transmitting second film 212 covering the second surface 210B of the first lens 11, and the light-transmitting third film 213 provided on the second film 212. Figure 5 In the example shown, the light-transmitting first film 211 further covers the first surface 210a of the first support portion 25. In addition, the light-transmitting second film 212 and the light-transmitting third film 213 further cover the second surface 210b of the first support portion 25. The light-transmitting property here refers to the property of being able to transmit more than 60% of the incident light.

[0074] The first lens 11 has an incident portion 12A disposed in the center on the first surface 210A opposite to the light emitting portion 1, into which light from the light emitting portions 1a to 1i is incident, and a light guiding portion 21 disposed in an annular shape outside the incident portion 12A, for guiding the light incident from the incident portion 12A. In the present embodiment, the annular shape includes not only a circular shape such as a ring, but also a closed shape that does not intersect with itself. The shape of the bottom surface of the first lens 11 may be a rotationally symmetrical shape. When the light source device 200 is used as a flash light source for a smartphone or the like, considering that the shooting range of a general camera is rectangular, the shape of the bottom surface of the first lens 11 may be a four-fold rotationally symmetrical shape or a two-fold rotationally symmetrical shape when viewed from above.

[0075] The incident portion 12A is formed below the first lens 11, and the light emitting portion 1 is a concave portion formed in a size located inside when viewed from above. In the present embodiment, the shape of the bottom surface of the concave portion is circular when viewed from above, and may be an ellipse, a triangle, a quadrilateral, a hexagon, etc. In addition, the bottom surface of the concave portion preferably has a Fresnel lens-like shape. That is, the incident portion 12A preferably includes: a convex lower convex surface 14 disposed in the center and on the light emitting portion 1 side, and a convex portion 16 disposed in an annular shape around the lower convex surface 14 and protruding on the light emitting portion 1 side. Further, the convex portion 16 is preferably disposed in an annular shape around the lower convex surface 14 continuously or intermittently. The convex portion 16 is formed in an annular shape for one cycle here, but may be formed in a manner of forming multiple cycles. By having the convex portion 16, the radius of the lower convex surface 14 can be reduced, so that the light from the light emitting portion 1 can be further adopted, and the light focusing property is improved. In addition, the inner side surface 22 of the concave portion is preferably a flat surface, and may be a curved surface.

[0076] The light guide portion 21 is disposed on the lower side of the first lens 11 and outside the incident portion 12A when viewed from above. The light guide portion 21 has an inclined surface 23 that reflects light incident from the incident portion 12A. The light guide portion 21 is preferably formed continuously or intermittently in a ring shape around the incident portion 12A. As a result, the emission angle of the light emitted from the light-emitting portion 1 becomes larger, and the light emitted outside the desired irradiation range is focused by the light guide portion 21, which can improve the light extraction efficiency. The inclination angle of the inclined surface 23 relative to the optical axis C1 of the first lens 11 can be appropriately set so that the light from the light-emitting portion 1 can be incident and reflected. The inclination angle of the inclined surface 23 relative to the optical axis C1 of the first lens 11 is preferably an angle that totally reflects the light from the light-emitting portion 1. The first surface 210A of the first lens 1 may have a total reflection surface.

[0077] The first light-transmitting member 201 has, for example, a flat portion 19 including the second surface 210B of the first lens 11 and the entire circumference of the second surface 210B of the first lens 11. The second surface 210B of the first lens 11 has an upper convex surface 17 and an upper concave surface 18. The upper convex surface 17 is arranged at the center of the second surface 210B and has a convex shape on the second lens 31 side. The upper concave surface 18 is arranged in an annular shape so as to surround the entire circumference of the upper convex surface 17 and is continuous on the upper convex surface 17. The flat portion 19 is arranged so as to surround the entire circumference of the upper concave surface 18 and is continuous on the upper concave surface 18. For example, the upper concave surface 18 is provided on the outer side compared to the lower convex surface 14 in a plan view. Since the first lens 11 has the upper convex surface 17, it is possible to easily extract light incident from the lower convex surface 14 or the convex portion 16 of the incident portion 12A or both of them from the second lens side. In addition, since the first lens 11 has an upper concave surface 18, the light reflected by the inclined surface 23 can be easily taken out from the second lens side. Furthermore, since the upper concave surface 18 is provided, the inclination angle of the inclined surface 23 relative to the optical axis C1 of the first lens 11 can be further reduced. Thus, the lens diameter of the first lens 11 can be reduced, and accordingly, the lens diameter of the second lens 31 can also be reduced. Furthermore, accordingly, the diameter of the opening 52 of the third support portion 51 described later can be reduced. Thus, the interior of the opening 52 is not easily visible, and the appearance can be improved. The bottom of the substrate 210 is an example of the first surface, and the top of the substrate 210 is an example of the second surface.

[0078] The first support portion 25 extends laterally from the outer edge of the first lens 11. The first support portion 25 has a first upper portion 25a and a first leg portion 25b. The first upper portion 25a extends laterally from the outer edge of the first lens 11. The first leg portion 25b extends from the first upper portion 25a toward the substrate 41. The first support portion 25 extends laterally from the outer edge of the first lens 11 and is formed in an annular shape so as to surround the first lens 11. The upper portion of the first upper portion 25a is formed flatly and is formed at substantially the same height as the upper end of the upper convex surface 17 of the first lens 11. For example, the first leg portion 25b is formed in a continuous cylindrical shape along the side of the first upper portion 25a. For example, the first lens 11 and the first support portion 25 are formed integrally from the same member. The first lens 11 and the first support portion 25 may be formed from materials different from each other. For example, the first lens 11 may be formed of a light-transmitting resin or glass material, and the first support portion 25 may be formed of a metal such as an aluminum alloy.

[0079] The lower surface of the first leg portion 25b of the first support portion 25 and the upper surface of the substrate 41 are bonded to each other by the bonding member 61A. That is, the base material 210 is fixed to the substrate 41. As the bonding member 61A, an adhesive material such as resin or adhesive tape can be used.

[0080] The first film 211 covers the incident portion 12A and the inclined surface 23 of the first lens 11. In the present embodiment, the first film 211 covers the lower convex surface 14, the convex portion 16, the inner side surface 22 of the concave portion, and the inclined surface 23 of the first lens 11. That is, the first film 211 covers the first surface 210A which is the incident surface of the substrate 210. It is preferred that the first film 211 overlaps with the optical axis C1 of the first lens 11 and the light-emitting surface of the light-emitting portion 1 when viewed from above. In the present embodiment, the optical axis C1 of the first lens 11 is located at a position overlapping with the light-emitting portion 1e when viewed from above, and the optical axis C1 of the first lens 11 overlaps with the light-emitting surface 7e. For example, when the light emitted by the light-emitting portion 1e of the light source device 200 is used as a flash illumination for telephoto photography, the light reflected by the incident portion 12A of the first lens 11 can be reduced by the first film 211, and the object can be illuminated with narrow light distribution and high illumination. The second film 212 covers the emission portion 12B of the first lens 11. In the present embodiment, the second film 212 covers the upper convex surface 17. That is, the second film 212 covers the second surface 210B which is the emission surface of the substrate 210. The second film 212 may further cover the upper concave surface 18 of the first lens 11. The third film 213 is provided on the second film 212. For example, the first film 211 is in contact with the incident portion 12A, the second film 212 is in contact with the upper convex surface 17, and the third film 213 covers the upper convex surface 17 from the second film 212.

[0081] (Second light-transmitting member)

[0082] Next, the specific structure of the second light-transmitting member 202 will be described.

[0083] The second light-transmitting member 202 has a second lens 31 and a second supporting portion 38. The lower surface of the second lens 31 of the second lens 31 is arranged opposite to the second surface 210B of the first lens 11, so that the light emitted from the emission portion 12B of the first lens 11 is refracted and emitted into the desired irradiation range. The second light-transmitting member 202 is formed of a light-transmitting resin such as polycarbonate resin, acrylic resin, silicone resin, epoxy resin, etc., similarly to the first light-transmitting member 201. The outer shape of the second light-transmitting member 202 is preferably circular or elliptical when viewed from above, and may be a polygon such as a quadrilateral or hexagon.

[0084] The second lens 31 has a plurality of annular convex portions 34 that are opposed to the second surface 210B of the first lens 11. The plurality of annular convex portions 34 may be of a Fresnel shape. The lens surface 32 has a central convex portion 33 and a plurality of annular convex portions 34. The central convex portion 33 has a convex shape on the first lens 11 side. The plurality of convex portions 34 are arranged concentrically with the optical axis C2 of the second lens 31 as the center on the outside of the central convex portion 33, and have a convex shape on the first lens 11 side. It is preferred that the plurality of annular convex portions 34 are arranged concentrically with respect to the central convex portion 33 when viewed from above, and have an annular shape along the shape of the central convex portion 33. That is, it is preferred that if the central convex portion 33 is circular when viewed from above, the convex portion 34 has an annular shape when viewed from above, and if the central convex portion 33 is rectangular when viewed from above, the convex portion 34 has a rectangular annular shape when viewed from above. The lens surface 32 is preferably formed to be sized so that the incident portion 12A of the first lens 11 and the light guide portion 21 are located inside when viewed from above. In addition, the lower surface of the second lens 31 may have a Fresnel lens surface.

[0085] The second light-transmitting member 202 has a flat surface 36 on the upper surface. The flat surface 36 is formed to be equal to or larger than the lens surface 32 in a plan view. When the second light-transmitting member 202 is inserted into the opening 52 of the third support portion 51, the flat surface 36 is formed to be at the same height as the upper surface of the third support portion 51. The flat surface 36 may be embossed or have fine projections and depressions.

[0086] The second support portion 38 is formed in an annular shape by extending laterally from the outer edge of the second lens 31, and the upper surface is formed in a manner that is flush with the flat surface 36. The lower end surface of the second support portion 38 is located below the lower surface of the lens surface 32. In the second light-transmitting member 202, the second support portion 38 is formed on the center side compared to the first leg portion 25b of the first lens 11. The lower end surface of the second support portion 38 is located below the lens surface 32, and the first lens 11 and the second lens 31 are separated from each other. Therefore, the interference between the first lens 11 and the second lens 31 can be reduced.

[0087] <Light-emitting part>

[0088] Next, the specific configuration of the light emitting unit 1 will be described. Figure 7 A cross-sectional view showing a light emitting portion. Figure 7 for Figure 6 Cross-sectional view along line VII-VII.

[0089] Each of the light-emitting parts 1a to 1i has a light-emitting surface 7a to 7i on the upper surface. In the following description, the light-emitting surfaces 7a to 7i are sometimes collectively referred to as the light-emitting surface 7. The light-emitting part 1 is mounted on the substrate 41 with the upper surface and the lower surface on the opposite side as mounting surfaces. The light-emitting part 1 has a light-emitting element 2, a wavelength conversion member 4, and a covering member 5. The wavelength conversion member 4 is provided on the upper surface of the light-emitting element 2. The covering member 5 covers the side surfaces of the light-emitting element 2 and the side surfaces of the wavelength conversion member 4. The upper surface of the wavelength conversion member 4 is exposed by the covering member 5. The upper surface of the wavelength conversion member 4 is the light-emitting surface 7 (i.e., the main light extraction surface). In addition, the side surface of the wavelength conversion member 4 may be exposed from the covering member 5. In addition, the shape (planar shape) of the light-emitting part 1 in a top view is, for example, a quadrilateral. The planar shape of the light-emitting part 1 may be circular or elliptical, or may be a polygon such as a triangle or a hexagon. Each of the light-emitting parts 1a to 1i may have the same structure, and at least one member may have a different structure. The light emitting parts 1 a to 1 i can be connected to each other by being integrally molded using the covering member 5 .

[0090] The light emitting element 2 includes at least one pair of positive and negative element electrodes below it. In this embodiment, a positive electrode 3P and a negative electrode 3N are provided. The light emitting element 2 is mounted on a substrate 41, and an electrode 42 of the substrate 41 is electrically connected to the element electrode of the light emitting element 2. The light emitting element 2 is, for example, a semiconductor element, including semiconductors such as III-V compound semiconductors and II-VI compound semiconductors. Examples of compound semiconductors include In X Al Y Ga 1-X-Y N (0≤X, 0≤Y, X+Y≤1) and other nitride semiconductors. Specifically, examples of compound semiconductors include InN, AlN, GaN, InGaN, AlGaN and InGaAlN. The light emitting element 2 is, for example, an LED (Light Emitting Diode) or an LD (Laser Diode). The peak wavelength of light emission of the light emitting element 2 is preferably 400 nm to 530 nm, more preferably 420 nm to 490 nm, and further preferably 440 nm to 475 nm, from the viewpoint of light emitting efficiency and excitation of the phosphor described later.

[0091] The wavelength conversion member 4 is a plate-shaped member having a substantially rectangular shape in a plan view, and covers the light emitting element 2. The wavelength conversion member 4 contains a phosphor that converts the wavelength of at least a portion of the light from the light emitting element 2. The wavelength conversion member 4 can be formed using a light-transmitting resin material, ceramic, glass or other inorganic material. As the resin material, a thermosetting resin such as a silicone resin, a silicone-modified resin, an epoxy resin, a phenolic resin or the like can be used. In addition, a thermoplastic resin such as a polycarbonate resin, an acrylic resin, a methylpentene resin, a polynorbornene resin or the like can be used. Particularly suitable are silicone resins or their modified resins having excellent light resistance and heat resistance. In addition, the light transmittance here refers to the property of being able to transmit more than 60% of the incident light. Furthermore, the wavelength conversion member 4 can contain a light diffusing substance. As the wavelength conversion member 4, there can be cited a member containing a phosphor in the above-mentioned resin material, ceramic, glass or the like, a sintered body of the phosphor, or the like.

[0092] As the phosphor included in the wavelength conversion member 4, 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-based 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) and other 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 )F6-x :Mn (here, x satisfies 0<x<1.)) or MGF series phosphors (for example, 3.5MgO-0.5MgF2-GeO2:Mn) and other fluoride-based phosphors, quantum dots with perovskite structure (for example, (Cs, FA, MA)(Pb, Sn)(F, Cl, Br, I)3 (here, FA and MA represent formamidine and methylammonium, respectively.)), II-VI group quantum dots (for example, CdSe), III-V group quantum dots (for example, InP), or quantum dots with chalcopyrite structure (for example, (Ag, Cu)(In, Ga)(S, Se)2), etc. The above-mentioned phosphors are particles. In addition, one of these phosphors can be used as a monomer, or two or more of these phosphors can be used in combination.

[0093] For example, when a blue light emitting element is used as the light emitting element 2, the wavelength conversion member 4 contains a yellow phosphor to obtain a light emitting unit 1 that emits white light. The wavelength conversion member 4 may contain a light diffusing substance, and as the light diffusing substance, for example, titanium oxide, barium titanate, aluminum oxide, silicon oxide, etc. can be used.

[0094] The covering member 5 covers the side of the light emitting element 2 and the wavelength conversion member 4 directly or indirectly. In order to improve the light extraction efficiency, the covering member 5 is preferably composed of a member with high light reflectivity. For example, the covering member 5 can use a resin material containing a light reflective substance such as a white pigment. As the light reflective substance, 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. can be cited, and one of these can be used alone, or two or more of these can be used in combination. In addition, as the resin material, it is preferred that a resin material with a thermosetting resin such as an epoxy resin, a silicone resin, a silicone-modified resin, a phenolic resin as the main component is set as a matrix. In addition, the covering member 5 can be composed of a member that is translucent to visible light as needed.

[0095] (Substrate)

[0096] Next, a specific configuration of the substrate 41 will be described. The substrate 41 has the light emitting unit 1 mounted thereon. Figure 7 As shown, the surface of the substrate 41 has an electrode 42. The substrate 41 may include the electrode 42 inside. The electrode 42 and the electrodes 3P and 3N of the light emitting section 1 are connected via the conductive adhesive member 62, so that the substrate 41 and the light emitting section 1 are electrically connected.

[0097] The substrate 41 includes an insulating material. As the insulating material, it is preferred to use a material that is not easy to transmit light emitted from the light-emitting portion 1, external light, etc., and it is preferred to use a material with a certain degree of strength. Specifically, the substrate 41 can be composed of a resin such as alumina, aluminum nitride, and mullite, phenol resin, epoxy resin, polyimide resin, BT resin (bismaleimide triazine resin), and polyphthalamide.

[0098] The electrode 42 can be made of copper, iron, nickel, tungsten, chromium, aluminum, silver, gold, titanium, palladium, rhodium or alloys thereof. In addition, the surface layer of the electrode 42 may be provided with a layer of silver, platinum, aluminum, rhodium, gold or alloys thereof from the viewpoints of wettability of the conductive adhesive member 62 and light reflectivity.

[0099] (3rd Support Department)

[0100] Next, the specific structure of the third support portion 51 is described. The third support portion 51 covers the first lens 11 from the side. The third support portion 51 has a second upper portion 51a and a second leg portion 51b. The second upper portion 51a is formed in an annular shape and has an opening portion 52. The side surface of the opening portion 52 and the side surface of the second support portion 38 of the second light-transmitting member 202 are bonded to each other. The second lens 31 and the second support portion 38 can be bonded as a two-color molded body, and can be bonded between the second lens 31 and the second support portion 38 via an adhesive member. In addition, the bottom surface of the second upper portion 51a and the top surface of the first upper portion 25a of the first support portion 25 are bonded to each other through an adhesive member 61B. The second leg portion 51b extends downward from the second upper portion 51a. The side surface of the second leg portion 51b and the side surface of the substrate 41 are bonded to each other through an adhesive member 61C. As the adhesive members 61B and 61C, an adhesive material such as a resin or an adhesive tape can be used. The third support portion 51 preferably includes a light shielding member in a manner that can limit the light distribution direction of the light emitted from the light source device 200. For example, it is preferably composed of a resin material containing fillers such as a light reflecting member and a light absorbing member. The shape of the opening 52 can be circular, elliptical, triangular, quadrilateral, hexagonal, etc. when viewed from above.

[0101] [Method for manufacturing light source device according to second embodiment]

[0102] Next, a method for manufacturing the light source device 200 according to the second embodiment will be described. Figure 8 It is a flowchart showing the manufacturing method of the light source device 200 according to the second embodiment. Figures 9 to 11 It is a cross-sectional view showing a method of manufacturing the light source device 200 according to the second embodiment.

[0103] first, Fig. 9 As shown, the first surface 210A ( Fig. 9Middle and lower surface) and the second surface 210B ( Fig. 9 In this embodiment, the substrate 210 includes a first lens 11. The first lens 11 can be obtained, for example, by molding a raw material (step S1). Next, a step of transferring the substrate 210 to a fixture is performed (step S2). A plurality of substrates 210 can be transferred to the fixture.

[0104] Next, a process of forming a translucent aluminum oxide film 212X including aluminum oxide having a lower crystallinity than α-alumina to cover the first surface 210A and the second surface 210B of the substrate 210 by ALD is performed (step S3). The aluminum oxide film 212X can be formed by the same method as the aluminum oxide film 112X in the first embodiment.

[0105] then, Fig.10 As shown in FIG. 1 , a silicon oxide film is formed as a light-transmitting third film 213 on the aluminum oxide film 212X on the second surface 210B by sputtering, and a process of obtaining an intermediate structure 214 is performed (step S4). The intermediate structure 214 includes the substrate 210, the aluminum oxide film 212X formed on the first surface 210A of the substrate 210, and the aluminum oxide film 212X formed on the second surface 210B of the substrate 210, and the third film 213. The third film 213 can be formed by the same method as the third film 113 in the first embodiment.

[0106] Next, the intermediate structure 214 is subjected to a hydration treatment step (step S5). In this step, the intermediate structure 214 is subjected to a hydration treatment, so that Fig.11 As shown, the aluminum oxide film 212X is formed into a first film 211 including hydrated aluminum oxide disposed on the first surface 210A and a second film 212 including aluminum oxide having a lower crystallinity than α-alumina disposed on the second surface 210B. The hydration treatment can be performed by the same method as the hydration treatment in the first embodiment.

[0107] Next, a process of drying the intermediate structure 214 after the hydration treatment is performed. (Step S6) Thus, the first light-transmitting member 201 including the first lens 11 can be prepared. Then, the dried first light-transmitting member 201 is transferred from the fixture to the tray (Step S7). In Step S7, in the process of arranging the first light-transmitting member 201, a fixture such as a suction nozzle is brought into contact with the third film 213 to transport the first light-transmitting member 201.

[0108] In this embodiment, there is further a step of arranging the second light-transmitting member 202 on the first light-transmitting member 201. For example, the light-emitting unit 1, the substrate 41 on which the light-emitting unit 1 is mounted, and the second light-transmitting member 202 supported by the third supporting portion 51 are prepared, and they are assembled with the first light-transmitting member 201 including the first lens 11 (step S8). In step S8, first, the second light-transmitting member 202 is arranged on the first lens 11 via the adhesive member 61B in such a manner that the lower surface of the second lens 31 has a plurality of annular protrusions, for example, the lens surface 32 faces the second surface 210B of the first lens 11. Thus, the second light-transmitting member 202 has a plurality of annular protrusions on the surface facing the first light-transmitting member 201. Furthermore, the light-emitting unit 1 is mounted on the substrate 41, and the first light-transmitting member 201 is fixed to the substrate 41 in such a manner that the first light-transmitting member 201 is arranged in the path of the light emitted by the light-emitting unit 1. When the first light-transmitting member 201 is disposed, the first lens 11 is disposed so that light emitted from the light-emitting section 1 enters the first surface 210A of the first lens 11 and is emitted from the second surface 210B.

[0109] In this manner, the light source device 200 according to the second embodiment can be manufactured.

[0110] In the second embodiment, in the first lens 11, the first film 211 including hydrated aluminum oxide covers the lower surface facing the light-emitting parts 1a to 1i of the substrate 210. Since hydrated aluminum oxide includes fine concavoconvexities, it is possible to reduce reflection in the lower surface and improve the illumination in the light source device 200. In addition, the second film 212 covers the upper surface of the substrate 210, and the third film 213 is provided on the second film 212. The hardness of the third film 213 is higher than that of the second film 212. Therefore, when assembling the light source device 200, a jig such as a suction nozzle is in contact with the third film 113 to transfer the first light-transmitting member 201 including the first lens 11, so that the occurrence of damage in the first film 211 and the second film 212 can be reduced. Therefore, the degradation of optical characteristics accompanying the occurrence of damage can be reduced.

[0111] In addition, the critical angle between the substrate 210 and the air depends on the difference in transmittance between the substrate 210 and the air, and therefore, the critical angle between the substrate 210 and the air does not change regardless of the presence or absence of the first film 211. Assuming that the light emitted from the light emitting unit 1 is reflected according to the critical angle between the substrate 210 (here, the first lens 11) and the air, it is reflected inside the light source device 200 and is incident on the substrate 210 again. At this time, the light easily passes through the first film 111 and the substrate 210, so that stray light can be reduced.

[0112] <Third embodiment>

[0113] Next, a third embodiment will be described. The third embodiment relates to a light source device. Fig.12 It is a cross-sectional view showing a light source device according to a third embodiment. Fig.13 1 is a bottom view showing the lens and the support portion in the third embodiment. In the light source device 300 according to the third embodiment, the shape of the lens 81 of the first light-transmitting member 301, the shape of the second light-transmitting member 302, the first light-transmitting film 511, the second light-transmitting film 512, and the third light-transmitting film 513 are arranged in the area of ​​the first light-transmitting member 301, which are different from those of the light source device 200 according to the second embodiment.

[0114] The first light-transmitting member 301 includes a light-transmitting substrate 310 including a lens 81. The substrate 310 has an incident portion 13A on a first surface 310A of the lens 81, into which light from the light-emitting portion 1 is incident, and an emitting portion 13B on a second surface 310B of the lens 81, from which light transmitted through the lens 81 is emitted. The second light-transmitting member 302 is a plate-shaped member having flat surfaces on the upper and lower surfaces, and is disposed in the opening 52 of the third support portion 51 so as to overlap with the lens 81 of the first light-transmitting member 301 in a plan view.

[0115] The first light-transmitting member 301 has a light-transmitting first film 311 on the first surface 310A of the lens 81, and has a light-transmitting second film 312 and a light-transmitting third film 313 on the second surface 310B of the lens 81. The light-transmitting first film 311, the light-transmitting second film 312, and the light-transmitting third film 313 are provided in a region other than the first supporting portion 25 of the first light-transmitting member 301. Fig.13 As shown, the outer shape of the lens 81 and the first support portion 25 (first leg portion 25b) is preferably circular or elliptical when viewed from above, and can be a polygon such as a quadrilateral or hexagon. In the incident portion 13A of the lens 81, a plurality of annular convex portions 315 and annular convex portions 316 each have a shape arranged concentrically with the optical axis C3 of the lens 81 as the center. Among the plurality of convex portions 315, the closer the distance of the convex portion 315 from the substrate 41 at the front end is to the optical axis C3 of the lens 81, the smaller the convex portion 315. The first surface 310A of the lens 81 has a convex shape on the substrate 41 side as a whole. The plurality of convex portions 316 are arranged in a manner that surrounds the entire circumference of the plurality of convex portions 315. The front end, substrate 41 and distance of each convex portion 316 constituting the plurality of convex portions are approximately equal. In addition, the lens 81 can be a Fresnel lens including a plurality of concentric convex portions 316 with the optical axis C3 of the lens 81 as the center.

[0116] The same effect as that of the second embodiment can be obtained by the light source device 300 involved in the third embodiment. In addition, in the present embodiment, the first surface 310A of the lens 81 has a shape in which a plurality of annular protrusions 315 and protrusions 316 are arranged concentrically, so that even when the light source device 300 is observed from the second surface 310B side, the light emitting portion 1 is not easily observed, which can improve the appearance.

[0117] <Fourth embodiment>

[0118] Next, a fourth embodiment will be described. The fourth embodiment relates to a light source device. Fig.14 It is a cross-sectional view showing a light source device according to a fourth embodiment. Fig.15 It is a bottom view showing the lens and the support portion in the fourth embodiment. The shape of the lens 82 of the first light-transmitting member 401 of the light source device 400 according to the fourth embodiment is different from that of the light source device 300 according to the third embodiment.

[0119] The first light-transmitting member 401 includes a light-transmitting substrate 410 including a lens 82. The substrate 410 has an incident portion 14A on a first surface 410A of the lens 82 where light from the light-emitting unit 1 is incident, and an emitting portion 14B on a second surface 410B where light transmitted through the lens 82 is emitted.

[0120] The first light-transmitting member 401 has a light-transmitting first film 411 on the first surface 410A of the lens 82 , and has a light-transmitting second film 412 and a light-transmitting third film 413 on the second surface 410B of the lens 82 . Fig.15 As shown, the outer shape of the lens 82 and the first supporting portion 25 (first leg portion 25b) is preferably circular or elliptical when viewed from above, and can be a polygon such as a quadrilateral or hexagon. The lens 82 has a shape in which a plurality of annular protrusions 416 are arranged concentrically with the optical axis C4 of the lens 82 as the center at the incident portion 14A. The plurality of annular protrusions 416 can constitute a Fresnel lens. Among the plurality of protrusions 416, the distance between the front end of the protrusion 416 and the substrate 41 becomes smaller as the distance between the front end of the protrusion 416 and the substrate 41 approaches the optical axis C4 of the lens 82. The first surface 410A of the lens 82 has a convex shape on the substrate 41 side as a whole. In addition, the second surface 410B of the lens 82 is a convex surface protruding on the side opposite to the substrate 41 side.

[0121] The same effect as that of the second embodiment can be obtained by the light source device 400 involved in the fourth embodiment. In addition, in the present embodiment, the first surface 410A of the lens 82 has a shape in which a plurality of annular protrusions 416 are arranged concentrically, so that even when the light source device 400 is observed from the second surface 410B side, the light emitting portion 1 is not easily observed, and the appearance can be improved.

[0122] <Fifth embodiment>

[0123] Next, a fifth embodiment will be described. The fifth embodiment relates to a light source device. Fig.16 It is a cross-sectional view showing a light source device according to a fifth embodiment. Fig.17 It is a bottom view showing the lens and the support portion in the fifth embodiment. The shape of the lens 83 of the first light-transmitting member 501 of the light source device 500 according to the fifth embodiment is different from that of the light source device 300 according to the third embodiment.

[0124] The first light-transmitting member 501 includes a light-transmitting substrate 510 including a lens 83. The substrate 510 has an incident portion 15A on a first surface 510A of the lens 83 where light from the light-emitting unit 1 is incident, and an emitting portion 15B on a second surface 510B where light transmitted through the lens 83 is emitted.

[0125] The first light-transmitting member 501 has a light-transmitting first film 511 on the first surface 510A of the lens 83 , and has a light-transmitting second film 512 and a light-transmitting third film 513 on the second surface 510B of the lens 83 . Fig.17 As shown, the outer shape of the lens 83 and the first supporting portion 25 (first leg portion 25b) is preferably circular or elliptical when viewed from above, and can be a polygon such as a quadrilateral or hexagon. The lens 83 has a lower convex surface 514 that is arranged at the center of the incident portion 15A and convex on the light-emitting portion 1 side, and a plurality of annular convex portions 516 that are concentrically arranged around the lower convex surface 514 with the optical axis C5 of the lens 83 as the center. The plurality of annular convex portions 516 can constitute a Fresnel lens. Among the plurality of convex portions 516, the distance between the front end of the convex portion 516 and the substrate 41 becomes smaller as the distance between the convex portion 516 and the substrate 41 approaches the optical axis C5 of the lens 83. The first surface 510A of the lens 83 has a convex shape on the substrate 41 side as a whole. In addition, the second surface 510B of the lens 83 is a convex surface that protrudes on the side opposite to the substrate 41 side.

[0126] The same effect as that of the second embodiment can be obtained by the light source device 500 involved in the fifth embodiment. In addition, in the present embodiment, the first surface 510A of the lens 83 has a shape in which a plurality of annular protrusions 516 are arranged concentrically, so that even when the light source device 500 is observed from the second surface 310B side, it is not easy to observe the interior of the light source device 500, which can improve the appearance.

[0127] <Example>

[0128] Next, an experiment conducted by the inventor of the present application is described. In this experiment, four samples including lenses were prepared. The first sample was Figure 5 The first light-transmitting member including two convex lenses as shown in the figure is Figure 8The first film 211 is a hydrated aluminum oxide film, the second film 212 is an aluminum oxide film with a lower crystallinity than α-alumina, and the third film 213 is a silicon oxide film. The second sample is composed of only a substrate 210 including two convex lenses. Figure 8 The third sample and the fourth sample are produced by the process of step S1 in the following.

[0129] The third sample is different from the first sample in that it does not have the first film and the second film. Specifically, the third sample has a silicon oxide film disposed in contact with the first surface of the substrate 210. In addition, a silicon oxide film is disposed in contact with the second surface of the substrate 210.

[0130] The fourth sample is different from the first sample in that it does not have the first film and the second film. Specifically, the fourth sample has an α-aluminum oxide film, a silicon oxide film, an α-aluminum oxide film, and a silicon oxide film arranged in order from the first surface side on the first surface of the substrate 210. In addition, an α-aluminum oxide film, a silicon oxide film, an α-aluminum oxide film, and a silicon oxide film are arranged in order from the second surface side on the second surface of the substrate 210.

[0131] Next, the method of preparing the third sample and the fourth sample will be described. Fig.18 This is a flow chart showing the method for preparing the third sample. Fig.19 This is a flow chart showing the method for preparing the fourth sample.

[0132] In the preparation of the third sample, first, a step of preparing a substrate 210 including a lens is performed. The substrate 210 is produced by molding a raw material (step S11). Next, a step of transferring the substrate 210 to a jig is performed (step S12).

[0133] Next, a step of forming a silicon oxide film on the first surface and the second surface of the substrate 210 by the ALD method at a film formation temperature of about 100° C. is performed (step S13 ).

[0134] In this way, the third sample was produced.

[0135] In the preparation of the fourth sample, first, a step of preparing a substrate 210 including a lens is performed. The substrate 210 is produced by molding a raw material (step S21). Next, a step of transferring the substrate 210 to a jig is performed (step S22).

[0136] Next, a step of forming an α-aluminum oxide film on the first surface and the second surface of the substrate 210 is performed (step S23 ).

[0137] Next, a step of forming a silicon oxide film on the α-aluminum oxide film formed on the first and second surfaces is performed (step S24).

[0138] Next, a step of forming an α-aluminum oxide film on the silicon oxide film formed on the first surface and the second surface is performed (step S25).

[0139] Next, a step of forming a silicon oxide film on the α-aluminum oxide film formed on the first surface and the second surface is performed (step S26).

[0140] In the preparation of the fourth sample, the α-aluminum oxide film was formed by the ALD method at a film formation temperature of about 100° C., and the silicon oxide film was formed by the ALD method at a film formation temperature of about 100° C.

[0141] In this way, the fourth sample was prepared.

[0142] In addition, the optical characteristics and scratch resistance of the first, second, third and fourth samples were evaluated. In the evaluation of the optical characteristics, the light extraction efficiency of the lens itself and the light extraction efficiency in the light source device including the lens were measured. In the evaluation of the optical characteristics, a light-emitting portion including a light-emitting element with a peak wavelength of 450nm, a wavelength conversion member provided on the light-emitting element, and a covering member covering the side of the light-emitting element and the side of the wavelength conversion member was used. The light-emitting portion emits white light by mixing the light of the light-emitting element with the light whose wavelength is converted by the wavelength conversion member. In the evaluation of the scratch resistance, when assembling the light source device, after simulating the transport of the lens to the disk once and three times, the presence or absence of damage to the light-transmitting film provided on the second surface of the lens was confirmed respectively. During the transportation of the lens to the disk, the lens is adsorbed from the second surface side at about 2N by an adsorption pad comprising rubber. The results are shown in Table 1. The numerical values ​​in the column of "Evaluation of Optical Characteristics" in Table 1 represent relative light-extraction efficiency when the light-extraction efficiency in the second sample is set to 100.0%.

[0143] [Table 1]

[0144]

[0145] As shown in Table 1, in the first sample, the first surface is provided with a first film containing fragile hydrated aluminum oxide, and on the other hand, the second surface is provided with a third film having a higher hardness than the first film and the second film. Therefore, when assembling the light source device, the first light-transmitting member is transported by bringing a fixture such as an adsorption nozzle into contact with the third film, so that the surface of the first light-transmitting member is not damaged, and the same good scratch resistance as the third and fourth samples is obtained. In addition, in the first sample, a higher light extraction efficiency is obtained than that of the third and fourth samples. This is because a hydrated aluminum oxide film is provided as the first film on the first surface of the substrate 210 as the light incident surface.

[0146] In this experiment, the first film containing hydrated aluminum oxide is provided on the first surface of the substrate 210 as the light incident surface, but the first film containing hydrated aluminum oxide may be provided on the second surface of the substrate 210 as the light exit surface, and the third film may be provided on the first surface of the substrate 210 as the light incident surface. In this case, when assembling the light source device, the first light-transmitting member is transported by bringing a fixture such as an adsorption nozzle into contact with the third film provided on the first surface, thereby similarly reducing the damage to the surface of the first light-transmitting member. In addition, the first light-transmitting member can improve the light extraction efficiency in the same manner as the first sample by having the first film containing hydrated aluminum oxide on the second surface as the light exit surface.

[0147] As mentioned above, although the preferred embodiments and the like have been described in detail, the present disclosure is not limited to the above embodiments and the like, and various changes and substitutions can be added to the above embodiments and the like without departing from the scope described in the claims.

[0148] The light-transmitting member and light source device according to the embodiments of the present disclosure have excellent light extraction efficiency, and thus can be used as a flash light source, as a headlight light source of a vehicle lamp. In addition, the light-transmitting member and light source device according to the embodiments of the present disclosure can be used for backlight light sources of liquid crystal displays, various lighting fixtures, large displays, advertisements, various display devices such as destination navigation, etc. However, the light source device of the present disclosure is not limited to these uses.

[0149] This specification includes the following embodiments.

[0150] 1. A light-transmitting member, comprising:

[0151] a light-transmitting substrate having a first surface and a second surface located on the opposite side of the first surface,

[0152] a light-transmitting first film covering the first surface,

[0153] a light-transmitting second film covering the second surface, and

[0154] a light-transmitting third film disposed on the second film,

[0155] The first film comprises hydrated aluminum oxide,

[0156] The second film includes aluminum oxide having a lower crystallinity than α-alumina.

[0157] The third film has a higher hardness than the second film.

[0158] 2. The light-transmitting member according to 1 above,

[0159] The thickness of the first film is not less than 200 nm and not more than 300 nm.

[0160] 3. The light-transmitting member according to 1 or 2 above,

[0161] The thickness of the second film is not less than 25 nm and not more than 45 nm.

[0162] 4. The light-transmitting member according to any one of 1 to 3 above,

[0163] The third film includes a silicon oxide film having a thickness of not less than 80 nm and not more than 135 nm.

[0164] 5. The light-transmitting member according to any one of 1 to 4 above,

[0165] The first surface and the second surface include convex surfaces.

[0166] 6. The light-transmitting member according to any one of 1 to 5 above,

[0167] The first surface has a total reflection surface.

[0168] 7. The light-transmitting member according to any one of 1 to 6 above,

[0169] The substrate is a lens.

[0170] 8. A light source device, comprising:

[0171] a light emitting portion, and

[0172] The light-transmitting member according to any one of 1 to 7 above, arranged in the path of the light emitted by the light-emitting unit.

[0173] 9. The light source device according to 8 above,

[0174] The substrate is a lens.

[0175] The light emitting portion has a light emitting surface.

[0176] The optical axes of the first film and the lens overlap with the light emitting surface in a plan view.

[0177] 10. The light source device according to 8 or 9 above,

[0178] On the substrate, the light is incident on the first surface and emitted from the second surface.

[0179] 11. The light source device according to any one of 8 to 10 above,

[0180] The light source device is for flashing.

[0181] 12. A method for manufacturing a light-transmitting member, comprising the steps of:

[0182] a step of preparing a light-transmitting substrate having a first surface and a second surface located on the opposite side of the first surface,

[0183] a step of forming a light-transmitting aluminum oxide film covering the first surface and the second surface and comprising aluminum oxide having a lower crystallinity than α-alumina,

[0184] a step of forming a light-transmitting third film on the aluminum oxide film on the second surface to obtain an intermediate structure, and

[0185] A process of hydrating the intermediate structure, wherein the intermediate structure is hydrated so that the aluminum oxide film becomes a first film comprising hydrated aluminum oxide arranged on the first surface, and a second film comprising aluminum oxide having a lower crystallinity than α-alumina arranged on the second surface.

[0186] 13. The method for manufacturing a light-transmitting member according to 12 above,

[0187] In the step of subjecting the intermediate structure to a hydration treatment, the intermediate structure is exposed to water containing a liquid or water vapor at a temperature of 70° C. or higher and 100° C. or lower.

[0188] 14. The method for producing a light-transmitting member according to 12 or 13 above,

[0189] In the step of forming the aluminum oxide film, the aluminum oxide is formed by an atomic layer deposition method.

[0190] 15. The method for producing a light-transmitting member according to any one of 12 to 14 above,

[0191] In the step of subjecting the intermediate structure to a hydration treatment, the hardness of the third film is made higher than the hardness of the second film.

[0192] 16. The method for producing a light-transmitting member according to any one of 12 to 15 above,

[0193] In the step of obtaining the intermediate structure, the third film is formed by a sputtering method.

[0194] 17. The method for producing a light-transmitting member according to any one of 12 to 16 above,

[0195] The third film includes a silicon oxide film having a thickness of not less than 80 nm and not more than 135 nm.

[0196] 18. The method for producing a light-transmitting member according to any one of 12 to 17 above,

[0197] The substrate is a lens.

[0198] 19. A method for manufacturing a light source device, comprising the following steps:

[0199] a step of preparing a light-transmitting member manufactured by the manufacturing method described in any one of 12 to 18 as a first light-transmitting member,

[0200] The process of preparing the light emitting part, and

[0201] The step of disposing the first light-transmitting member in the path of light emitted from the light-emitting portion.

[0202] 20. The method for manufacturing the light source device according to 19 above,

[0203] The first light-transmitting member is disposed so that the light is incident on the first surface of the substrate and is emitted from the second surface.

[0204] 21. The method for manufacturing a light source device according to 19 or 20 above,

[0205] The step of arranging the first light-transmitting member includes the step of bringing a jig into contact with the third film to transport the first light-transmitting member.

[0206] 22. The method for manufacturing a light source device according to any one of 19 to 21 above,

[0207] It further comprises the step of disposing a second light-transmitting member on the first light-transmitting member.

[0208] The second light-transmitting member has a plurality of annular protrusions on a surface facing the first light-transmitting member.

[0209] Explanation of symbols

[0210] 1, 1a, 1b, 1c, 1d, 1e, 1f, 1g, 1h, 1i: Light-emitting part

[0211] 2: Light-emitting element

[0212] 4: Wavelength conversion component

[0213] 5: Covering components

[0214] 7a, 7b, 7c, 7d, 7e, 7f, 7g, 7h, 7i: Luminous surface

[0215] 10: Light source

[0216] 11: 1st lens

[0217] 31: Second lens

[0218] 81, 82, 83: Lens

[0219] 100: Translucent components

[0220] 201, 301, 401, 501: First light-transmitting member

[0221] 202, 302: Second light-transmitting member

[0222] 110, 210, 310, 410, 510: Base material

[0223] 110A, 210A, 210a: Side 1

[0224] 110B, 210B, 210b: Side 2

[0225] 111, 211, 311, 411, 511: 1st film

[0226] 112, 212, 312, 412, 512: 2nd film

[0227] 112X, 212X: Aluminum oxide film

[0228] 113, 213, 313, 413, 513: The third membrane

[0229] 114, 214: Intermediate structure

[0230] 200, 300, 400, 500: Light source device

[0231] C1, C2, C3, C4, C5: Optical axis of the lens

[0232] R: Center of the light-emitting part

Claims

1. A light-transmitting member, comprising: a light-transmitting substrate having a first surface and a second surface located on the opposite side of the first surface, a light-transmitting first film covering the first surface, a light-transmitting second film covering the second surface, and a light-transmitting third film disposed on the second film, The first film comprises hydrated aluminum oxide, The second film includes aluminum oxide having a lower crystallinity than α-alumina, The third film has a higher hardness than the second film.

2. The light-transmitting member according to claim 1, The thickness of the first film is not less than 200 nm and not more than 300 nm.

3. The light-transmitting member according to claim 1 or 2, The second film has a thickness of not less than 25 nm and not more than 45 nm.

4. The light-transmitting member according to any one of claims 1 to 3, The third film includes a silicon oxide film having a thickness of not less than 80 nm and not more than 135 nm.

5. The light-transmitting member according to any one of claims 1 to 4, The first surface and the second surface include convex surfaces.

6. The light-transmitting member according to any one of claims 1 to 5, The first surface has a total reflection surface.

7. The light-transmitting member according to any one of claims 1 to 6, The substrate is a lens.

8. A light source device, comprising: a light emitting portion, and The light-transmitting member according to any one of claims 1 to 7, arranged in a path of light emitted by the light-emitting section.

9. The light source device according to claim 8, The substrate is a lens, The light emitting portion has a light emitting surface, The optical axes of the first film and the lens overlap with the light emitting surface in a plan view.

10. The light source device according to claim 8 or 9, On the substrate, the light is incident on the first surface and is emitted from the second surface.

11. The light source device according to any one of claims 8 to 10, The light source device is used for flashing.

12. A method for manufacturing a light-transmitting member, comprising the steps of: a step of preparing a light-transmitting substrate having a first surface and a second surface located on the opposite side of the first surface, a step of forming a light-transmitting aluminum oxide film covering the first surface and the second surface and including aluminum oxide having a lower crystallinity than α-alumina, forming a light-transmitting third film on the aluminum oxide film on the second surface to obtain an intermediate structure, and The step of subjecting the intermediate structure to hydration treatment, wherein: By subjecting the intermediate structure to a hydration treatment, the aluminum oxide film is formed into a first film including hydrated aluminum oxide disposed on the first surface and a second film including aluminum oxide having a lower crystallinity than α-alumina disposed on the second surface.

13. The method for producing a light-transmitting member according to claim 12, In the step of subjecting the intermediate structure to a hydration treatment, the intermediate structure is exposed to water containing a liquid or water vapor at a temperature of 70° C. or higher and 100° C. or lower.

14. The method for producing a light-transmitting member according to claim 12 or 13, In the step of forming the aluminum oxide film, the aluminum oxide is formed by an atomic layer deposition method.

15. The method for producing a light-transmitting member according to any one of claims 12 to 14, In the step of subjecting the intermediate structure to a hydration treatment, the hardness of the third film is made higher than the hardness of the second film.

16. The method for producing a light-transmitting member according to any one of claims 12 to 15, In the step of obtaining the intermediate structure, the third film is formed by a sputtering method.

17. The method for producing a light-transmitting member according to any one of claims 12 to 16, The third film includes a silicon oxide film having a thickness of not less than 80 nm and not more than 135 nm.

18. The method for producing a light-transmitting member according to any one of claims 12 to 17, The substrate is a lens.

19. A method for manufacturing a light source device, comprising the following steps: a step of preparing a light-transmitting member manufactured by the manufacturing method according to any one of claims 12 to 18 as a first light-transmitting member, The process of preparing the light emitting part, and The step of disposing the first light-transmitting member in a path of light emitted from the light-emitting section.

20. The method for manufacturing a light source device according to claim 19, The first light-transmitting member is arranged so that the light is incident on the first surface of the substrate and is emitted from the second surface.

21. The method for manufacturing a light source device according to claim 19 or 20, The step of arranging the first light-transmitting member includes the step of bringing a jig into contact with the third film to transport the first light-transmitting member.

22. The method for manufacturing a light source device according to any one of claims 19 to 21, It further comprises a step of disposing a second light-transmitting member on the first light-transmitting member, The second light-transmitting member has a plurality of annular convex portions on a surface facing the first light-transmitting member.

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