Light source device

Abstract

To provide a light source device that can prevent penetration of water content for a long term.SOLUTION: A light source device 90 includes a light source (light source component 2) in a space which is peripherally sealed by a plurality of housing components (case 7, glass lid 6) and is provided with: a first sealing material 9 made of a rubber material; and a spacer 11 adjacent to the first sealing material 9 and made of a metal, ceramic or glass at an abutment surface between a housing component (case 7) and a housing component (glass lid 6).SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to light source devices. [Background technology]

[0002] For example, waterproofing measures are taken to prevent damage to electronic components due to water intrusion in light source devices such as fishing lights, whose exterior is filled with water. In a conventional light source device disclosed in Patent Document 1 below, a breathable container is provided inside a sealed case that uses rubber as a sealant, and a desiccant such as silica gel is placed inside the container to absorb moisture. This prevents damage to electronic components. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-4510 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the case of light source devices that are constantly placed in water and therefore come into contact with water for long periods of time (several years or more), there is a concern that water may diffuse into the sealing material and penetrate into the device, causing condensation or failure of electronic components. Therefore, a configuration is required that prevents water from penetrating into the device.

[0005] The present disclosure has been made to solve the above-mentioned problems, and an object of the present disclosure is to provide a light source device that can prevent moisture from entering for a long period of time. [Means for solving the problem]

[0006] The light source device according to the present disclosure is a light source device having a light source in a space surrounded by a plurality of housing components, and a first sealant made of a rubber material and a spacer made of metal, ceramic, or glass are provided at the mating surfaces between the housing components. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to provide a light source device that can prevent moisture from entering for a long period of time. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a cross-sectional view showing a light source device according to a first embodiment. [Figure 2] FIG. 10 is a cross-sectional view showing a light source device according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments will be described with reference to the drawings. Common or corresponding elements in each drawing are designated by the same reference numerals, and descriptions thereof will be simplified or omitted. The configurations shown in the following embodiments are examples of the technical ideas of the present disclosure, and may be combined with other known technologies, or multiple technical ideas described in the present disclosure may be combined. Furthermore, it is also possible to omit or modify part of the configuration without departing from the gist of the present disclosure.

[0010] Embodiment 1 Fig. 1 is a cross-sectional view showing a light source device 90 according to embodiment 1. As shown in Fig. 1, the light source device 90 has a case 7, which is a housing component, and an electronic board 1 installed inside the case 7. A light source component 2 and a connector 3 are mounted on the electronic board 1.

[0011] The case 7 has an opening at the top. The case 7 may be made of metal. A glass cover 6, which is a component of the housing, is installed to cover the opening of the case 7. The glass cover 6 is made of a material that transmits light emitted from the light source component 2. Power is supplied to the electronic board 1 via an electric wire 4 connected to a connector 3. The electric wire 4 passes through an opening formed in the bottom of the case 7 and is connected to a power source external to the light source device 90. The opening at the bottom of the case 7 through which the electric wire 4 passes is sealed with a sealing resin 5.

[0012] Because the light source device 90 is installed underwater, the exterior of the light source device 90 is in contact with water 12. Therefore, to prevent damage to the electronic board 1 installed inside the case 7, a first sealant 9 and a second sealant 10 are provided on the mating surface between the case 7 and the glass lid 6. The outer casing part 8 is crimped to cover the case 7 and the glass lid 6. A compressive force is applied from the outer casing part 8 to the case 7, the glass lid 6, and the first sealant 9 and second sealant 10 provided therebetween. The compressive force applied by the outer casing part 8 compresses the first sealant 9 and second sealant 10 on the mating surface between the case 7 and the glass lid 6, thereby preventing water 12 from entering the interior of the light source device 90.

[0013] If a sufficiently large compressive force is applied to the first sealant 9 and the second sealant 10, the penetration of water 12 at the interfaces between the first sealant 9 and the second sealant 10 and the case 7 and the glass cover 6 is not a problem. However, if the light source device 90 is constantly placed underwater and is in contact with water 12 for a long period of time, such as several years, it is possible that water will penetrate into the interior of the light source device 90 over time, even if compressive force is applied to the first sealant 9 and the second sealant 10. This is due to the penetration of water 12 inside the first sealant 9 and the second sealant 10. The penetration of water 12 involves three processes: adsorption of water molecules at the contact surface between the first sealant 9 and the water 12, diffusion of water molecules into the first sealant 9 and the second sealant 10, and desorption of water molecules at the portion of the second sealant 10 facing the interior of the light source device 90. Among these, the dominant process that determines the time required for the water 12 to penetrate into the light source device 90 is the diffusion of water molecules into the first sealant 9 and the second sealant 10. Normally, the diffusion of water 12 inside the material used for the sealant is slow, but if the material is in contact with the water 12 for a very long period of time, the water 12 will penetrate into the light source device 90. Therefore, if the contact with the water 12 is to last for a long period of time, such as several years, measures must be taken to prevent the diffusion of water 12 inside the first sealant 9 and the second sealant 10.

[0014] One possible measure to prevent the diffusion of water 12 is to ensure a long diffusion path. In the first embodiment, a protrusion 6a is provided on glass lid 6 and a recess 7a is provided on case 7, which are interlocking structures. The protrusion 6a and recess 7a are formed around the entire periphery of the opening at the top of case 7. The height of the protrusion 6a on glass lid 6 and the recess 7a on case 7 are greater than the thickness of first sealant 9. Therefore, water molecules adsorbed at the contact surface between first sealant 9 and water 12 diffuse along the cross-sectional shape of first sealant 9, which snakes along the protrusion 6a on glass lid 6 and the recess 7a on case 7, thereby ensuring a long diffusion path. Alternatively, a recess may be provided on glass lid 6 and a protrusion on case 7. Alternatively, multiple pairs of recesses and protrusions may be provided. Providing multiple pairs of recesses and protrusions makes it possible to ensure a longer diffusion path.

[0015] Another possible approach to preventing the diffusion of water 12 is to use a material with a low diffusion coefficient for water 12. Rubber materials are generally used as sealants, and although the diffusion coefficient for water 12 varies depending on the type of rubber, simply selecting a rubber material with a low diffusion coefficient for water 12 makes it difficult to prevent water 12 from penetrating into the light source device 90 over time. Metals can also be used as materials that are much less susceptible to water 12 diffusion than rubber materials. However, when using metals as sealants, preventing water 12 from penetrating at the interface becomes more of a concern than preventing water 12 from penetrating. For example, copper gaskets, which are used as sealants for vacuum vessels, require uniform plastic deformation due to compressive force over the entire circumference, making manufacturing management difficult. As described above, simply replacing the first sealant 9 and the second sealant 10 with materials with a low diffusion coefficient for water 12 is difficult to address.

[0016] Therefore, in embodiment 1, a first sealant 9 and a second sealant 10 made of a rubber material that is relatively easy to prevent the intrusion of water 12 at the interface are provided at the mating surface between case 7 and crystal lid 6, and a spacer 11 made of a metal with a very small diffusion coefficient of water 12. Spacer 11 is adjacent to first sealant 9. Second sealant 10 is adjacent to spacer 11. In other words, spacer 11 is located between first sealant 9 and second sealant 10. First sealant 9 is in contact with crystal lid 6 and case 7. Spacer 11 is in contact with crystal lid 6 and case 7. Second sealant 10 is in contact with crystal lid 6 and case 7.

[0017] According to the configuration of the first embodiment, even if water molecules adsorbed at the contact surface between the first sealant 9 and the water 12 diffuse into the first sealant 9 and reach the interface between the first sealant 9 and the spacer 11, the diffusion of water 12 inside the metal spacer 11 is very slow, so the time required for the water molecules to reach the second sealant 10 can be significantly extended. Furthermore, because the first sealant 9 made of a rubber material is provided on the contact surface with the water 12, the intrusion of water 12 at the interface, which is a problem when using a metal for the sealing portion, can also be suppressed. As described above, according to the configuration of the first embodiment, the intrusion of water 12 into the light source device 90 can be suppressed, and the life of the light source device 90 can be improved.

[0018] The second sealing material 10 may be omitted. The spacer 11 may be made of ceramic or glass. The spacer 11 may be formed integrally with the case 7. Alternatively, the spacer 11 may be formed integrally with the crystal lid 6.

[0019] Embodiment 2 Next, a second embodiment will be described with reference to Fig. 2. The description will focus on differences from the first embodiment, and common explanations will be simplified or omitted. Elements that are common to or correspond to the elements described above will be denoted by the same reference numerals.

[0020] Fig. 2 is a cross-sectional view showing light source device 91 according to embodiment 1. As shown in Fig. 2, in light source device 91, crystal lid 6 is provided with recessed portion 6b instead of protruding portion 6a.

[0021] The permeation of water 12 consists of three processes: adsorption of water molecules at the contact surface between the first sealant 9 and the water 12, diffusion of water molecules into the first sealant 9 and the second sealant 10, and desorption of water molecules at the portion of the second sealant 10 facing the inside of the light source device 91. Of these, the dominant process that determines the time required for water 12 to permeate into the light source device is the diffusion of water molecules into the first sealant 9 and the second sealant 10. However, if the adsorption of water molecules at the contact surface between the first sealant 9 and the water 12 can be suppressed, the amount of water molecules that flows in due to the subsequent diffusion process can also be reduced.

[0022] Water 12 diffuses from the area with a high concentration of water molecules to the area with a low concentration of water molecules within the sealant, and its flow rate is proportional to the concentration gradient of water molecules according to Fick's law. In other words, water molecules adsorbed on the interface between the first sealant 9 and water 12 diffuse toward the interior where the concentration of water molecules is low. In the second embodiment, a recess 6b (first recess) is provided in the glass lid 6, and a recess 7a (second recess) facing the recess 6b is provided in the case 7. The recesses 6b and 7a are formed along the entire periphery of the opening at the top of the case 7. The first sealant 9 has a shape that conforms to the shapes of the recess 6b of the glass lid 6 and the recess 7a of the case 7. The interiors of the recesses 6b and 7a are filled with the first sealant 9. With this configuration, the cross-section of the first sealant 9 at the portion that conforms to the recesses 6b and 7a is larger than the cross-section of the first sealant 9 at the interface between the first sealant 9 and water 12. According to the configuration of the second embodiment, in the area with a large cross section, the direction of water diffusion is also dispersed in the thickness direction of the first sealing material 9, so the flux component toward the inside of the light source device 91 is reduced. This increases the time required for the water 12 to permeate the entire first sealing material 9. This allows the life of the light source device 91 to be improved.

[0023] In the second embodiment, similar to the first embodiment, the mating surfaces of the case 7 and the crystal lid 6 are provided with a first sealant 9 and a second sealant 10 made of a rubber material, which is relatively easy to prevent the infiltration of water 12 at the interface, and a spacer 11 made of a metal with a very small diffusion coefficient for water 12. Therefore, even if water molecules adsorbed at the interface between the first sealant 9 and the water 12 diffuse into the first sealant 9 and reach the interface between the first sealant 9 and the spacer 11, the diffusion of water 12 within the metal spacer 11 is very slow, significantly extending the time it takes for the water molecules to reach the second sealant 10. Furthermore, because the first sealant 9 made of a rubber material is provided at the interface with the water 12, the infiltration of water 12 at the interface, which is a problem when using a metal sealing member, can be prevented. As described above, the configuration of the second embodiment prevents the infiltration of water 12 into the light source device 91, thereby improving the lifespan of the light source device 91.

[0024] Even if only one of the recess 6b of the crystal lid 6 and the recess 7a of the case 7 is provided, an effect similar to that described above can be obtained.

[0025] Of the features of the above-described multiple embodiments, two or more features that can be combined may be combined and implemented.

[0026] Various aspects of the present disclosure are summarized below as appendices.

[0027] (Appendix 1) A light source device having a light source in a space whose periphery is sealed by a plurality of housing components, A light source device in which a first sealant made of a rubber material and a spacer made of metal, ceramics, or glass are provided on the mating surfaces of the housing components and adjacent to the first sealant. (Appendix 2) The light source device of claim 1, wherein the mating surface is provided with a second sealant made of a rubber material adjacent to the spacer. (Appendix 3) a recessed portion is provided on one of the housing components and a protruding portion is provided on the other housing component at the mating surface, and the recessed portion and the protruding portion are configured to engage with each other; 3. The light source device according to claim 1, wherein the depth of the recess and the height of the protrusion are greater than the thickness of the sealing material. (Appendix 4) 4. The light source device according to claim 3, wherein a plurality of sets of the recessed portion and the protruding portion are provided. (Appendix 5) A light source device according to any one of Supplementary Note 1 to Supplementary Note 4, wherein a recess is provided in at least one of the housing components on the mating surface, and the inside of the recess is filled with the sealing material. (Appendix 6) a first recess is provided in one of the housing components on the mating surface, and a second recess facing the first recess is provided in the other housing component, 6. The light source device according to claim 1, wherein the first recess and the second recess are filled with the sealing material. (Appendix 7) 7. The light source device according to claim 1, wherein the spacer is integrally formed with the housing component. [Explanation of symbols]

[0028] REFERENCE SIGNS LIST 1 electronic board, 2 light source component, 3 connector, 4 electric wire, 5 sealing resin, 6 glass cover, 6a convex portion, 6b concave portion, 7 case, 7a concave portion, 8 outer shell component, 9 first sealant, 10 second sealant, 11 spacer, 12 water, 90 light source device, 91 light source device

Claims

1. A light source device having a light source in a space whose periphery is sealed by a plurality of housing components, A light source device in which a first sealant made of a rubber material and a spacer made of metal, ceramics, or glass are provided on the mating surfaces of the housing components and adjacent to the first sealant.

2. 2. The light source device according to claim 1, wherein a second sealant made of a rubber material is provided on the mating surface adjacent to the spacer.

3. a recessed portion is provided on one of the housing components and a protruding portion is provided on the other housing component at the mating surface, and the recessed portion and the protruding portion are configured to engage with each other; 3. The light source device according to claim 1, wherein the depth of the recess and the height of the protrusion are greater than the thickness of the sealing material.

4. The light source device according to claim 3 , wherein a plurality of sets of the recessed portion and the protruding portion are provided.

5. 3. The light source device according to claim 1, wherein a recess is provided in at least one of the housing components on the mating surface, and the interior of the recess is filled with the sealant.

6. a first recess is provided in one of the housing components on the mating surface, and a second recess facing the first recess is provided in the other housing component, The light source device according to claim 1 or 2, wherein the first recess and the second recess are filled with the sealing material.

7. 3. The light source device according to claim 1, wherein the spacer is integrally formed with the housing component.

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