Vehicle lighting devices and vehicle lamps

Abstract

The problem that this invention aims to solve is to provide a vehicle lighting device and a vehicle lamp that can efficiently reflect light directed toward the surface of a substrate located inside the frame. [Solution] The vehicle lighting device according to the embodiment comprises: a socket; a substrate provided on one end side of the socket; a chip-shaped light-emitting element provided on the side of the substrate opposite to the socket side; a frame-shaped frame portion surrounding the light-emitting element; and a reflective film covering the surface of the substrate located inside the frame portion, the reflective film having a reflectance to light emitted from the light-emitting element that is higher than the reflectance of the surface of the substrate. The reflective film contains a resin and a plurality of light-scattering particles. The median diameter of the light-scattering particles is 0.01 μm or more and 1 μm or less. The concentration of the light-scattering particles in the reflective film is 10 vol% or more and 14 vol% or less.

Description

Technical Field

[0001] Embodiments of the present invention relate to a vehicle lighting device and a vehicle lamp.

Background Art

[0002] From the viewpoints of energy saving and long life, instead of a vehicle lighting device including a lamp having a filament, a vehicle lighting device including a light emitting element such as a light emitting diode has been increasingly popularized. In such a vehicle lighting device, a light emitting module having a light emitting element is provided.

[0003] In recent years, in order to miniaturize a vehicle lighting device, miniaturization of a light emitting module has been desired. Therefore, a vehicle lighting device has been proposed that includes a chip-shaped light emitting element provided on a substrate, a frame-shaped frame portion surrounding the light emitting element, and a sealing portion provided inside the frame portion and covering the light emitting element.

[0004] In addition, since the frame portion also has a function of a reflector, if the frame portion is provided, it is possible to increase the luminous flux of the light emitting module. However, in recent years, further increase in the luminous flux of the light emitting module has been demanded.

[0005] Here, a part of the light emitted from the light emitting element and traveling toward the interface between the sealing portion and the outside air is reflected at the interface, and a part of the reflected light travels toward the surface side of the substrate located inside the frame portion. In this case, the reflectance of the surface of the substrate with respect to the light emitted from the light emitting element is lower than the reflectance of the inner wall of the frame portion. Therefore, a technique has been proposed in which a film containing a material having a high reflectance is provided on the surface of the substrate.

[0006] However, in recent years, development of a technique capable of more efficiently reflecting the light traveling toward the surface side of the substrate located inside the frame portion has been desired.

Prior Art Documents

Patent Documents

[0007] [Patent Document 1] Japanese Patent Publication No. 2013-247061 [Overview of the project] [Problems that the invention aims to solve]

[0008] The problem that this invention aims to solve is to provide a vehicle lighting device and a vehicle lamp that can efficiently reflect light directed toward the surface of a substrate located inside the frame. [Means for solving the problem]

[0009] The vehicle lighting device according to the embodiment comprises: a socket; a substrate provided on one end side of the socket; a chip-shaped light-emitting element provided on the side of the substrate opposite to the socket side; a frame-shaped frame portion surrounding the light-emitting element; and a reflective film covering the surface of the substrate located inside the frame portion, the reflective film having a reflectance to light emitted from the light-emitting element that is higher than the reflectance of the surface of the substrate. The reflective film contains a resin and a plurality of light-scattering particles. The median diameter of the light-scattering particles is 0.01 μm or more and 1 μm or less. The concentration of the light-scattering particles in the reflective film is 10 vol% or more and 14 vol% or less. [Effects of the Invention]

[0010] According to embodiments of the present invention, it is possible to provide a vehicle lighting device and a vehicle lamp that can efficiently reflect light directed toward the surface side of a substrate located inside the frame. [Brief explanation of the drawing]

[0011] [Figure 1] This is a schematic perspective view illustrating a vehicle lighting device according to this embodiment. [Figure 2] This is a cross-sectional view of the vehicle lighting device shown in Figure 1, along line AA. [Figure 3]This is a microscopic image illustrating the distribution of light-scattering particles in a reflective film. [Figure 4] This graph illustrates the relationship between the concentration of light-scattering particles in a reflective film and the ratio of the total luminous flux of light emitted from the sealing portion. [Figure 5] This is a schematic partial cross-sectional view illustrating a vehicle lighting fixture. [Modes for carrying out the invention]

[0012] The embodiments will be illustrated below with reference to the drawings. In each drawing, similar components are denoted by the same reference numerals, and detailed descriptions will be omitted as appropriate.

[0013] (Vehicle lighting equipment)

[0014] The vehicle lighting device 1 according to this embodiment can be installed in, for example, automobiles or railway vehicles. Examples of vehicle lighting devices 1 installed in automobiles include those used in front combination lights (for example, a combination of daytime running lamps (DRL), position lamps, turn signal lamps, etc.) or rear combination lights (for example, a combination of stop lamps, taillights, turn signal lamps, backup lamps, fog lamps, etc.). However, the uses of the vehicle lighting device 1 are not limited to these.

[0015] Figure 1 is a schematic perspective view illustrating a vehicle lighting device 1 according to this embodiment. Figure 2 is a cross-sectional view of the vehicle lighting device 1 in Figure 1, along line AA. As shown in Figures 1 and 2, the vehicle lighting device 1 is provided with, for example, a socket 10, a light-emitting module 20, a power supply unit 30, and a heat transfer unit 40.

[0016] Socket 10 has, for example, a mounting portion 11, a bayonet 12, a flange 13, heat radiation fins 14, and a connector holder 15.

[0017] The mounting portion 11 is provided on a surface of the flange 13 opposite to the side where the heat radiation fins 14 are provided. The outer shape of the mounting portion 11 is, for example, cylindrical. The mounting portion 11 has, for example, a recess 11a that opens at an end opposite to the flange 13 side.

[0018] The bayonet 12 is provided, for example, on a side surface of the mounting portion 11. The bayonet 12 protrudes toward the outside of the vehicle lighting device 1. The bayonet 12 faces the flange 13. A plurality of bayonets 12 can be provided. The bayonet 12 is used, for example, when mounting the vehicle lighting device 1 to a housing 101 of a vehicle lamp 100 described later. The bayonet 12 can be used for a twist lock.

[0019] The flange 13 has, for example, a substantially disc shape. The side surface of the flange 13 is located outside the vehicle lighting device 1 than the side surface of the bayonet 12.

[0020] The heat radiation fins 14 are provided on the flange 13 on the side opposite to the mounting portion 11 side. At least one heat radiation fin 14 can be provided. For example, as shown in FIG. 1, a plurality of heat radiation fins 14 can be provided on the socket 10. The plurality of heat radiation fins 14 can be arranged side by side in a predetermined direction. The heat radiation fins 14 have, for example, a plate shape or a cylindrical shape.

[0021] The connector holder 15 is provided on the flange 13 on the side opposite to the mounting portion 11 side. The connector holder 15 can be provided side by side with the heat radiation fins 14. The connector holder 15 has a cylindrical shape, and a connector 105 having a seal member 105a inside is inserted therein.

[0022] The socket 10 has the function of holding the light-emitting module 20 and the power supply unit 30, and the function of transferring heat generated in the light-emitting module 20 to the outside. For this reason, it is preferable to form the socket 10 from a material with high thermal conductivity. For example, the socket 10 can be formed from a metal such as an aluminum alloy.

[0023] Furthermore, the socket 10 can also be formed from, for example, a highly thermally conductive resin. A highly thermally conductive resin is, for example, a resin such as PET (Polyethylene terephthalate) or nylon mixed with a filler such as carbon or aluminum oxide. If the socket 10 is made of a highly thermally conductive resin and the mounting part 11, bayonet 12, flange 13, heat dissipation fins 14, and connector holder 15 are integrally molded, the heat generated in the light-emitting module 20 can be efficiently dissipated. In addition, the weight of the socket 10 can be reduced.

[0024] The power supply unit 30 has, for example, a plurality of power supply terminals 31 and a holding unit 32. The multiple power supply terminals 31 can be rod-shaped. One end of each power supply terminal 31 protrudes from the bottom surface 11a1 of the recess 11a. One end of each power supply terminal 31 is soldered to a wiring pattern 21a provided on the substrate 21. The other end of each power supply terminal 31 is exposed inside the hole of the connector holder 15. The connector 105 is fitted onto the multiple power supply terminals 31 exposed inside the hole of the connector holder 15. The multiple power supply terminals 31 are formed from a metal such as a copper alloy.

[0025] As mentioned above, the socket 10 is formed from a material with high thermal conductivity. In this case, a material with high thermal conductivity may also be electrically conductive. For example, metals such as aluminum alloys and highly thermally conductive resins containing carbon fillers are electrically conductive. Therefore, the retaining part 32 is provided to insulate the multiple power supply terminals 31 from the conductive socket 10. The retaining part 32 also has the function of holding the multiple power supply terminals 31. Note that if the socket 10 is formed from a highly thermally conductive resin with insulating properties (for example, a highly thermally conductive resin containing aluminum oxide fillers), the retaining part 32 can be omitted. In this case, the socket 10 holds the multiple power supply terminals 31. The retaining part 32 is formed from, for example, a resin with insulating properties. The retaining part 32 can be, for example, press-fitted into a hole provided in the socket 10 or bonded to the inner wall of the hole.

[0026] The heat transfer unit 40 is provided between the socket 10 and the light-emitting module 20 (substrate 21). For example, the heat transfer unit 40 can be provided inside the recess 11b that opens into the bottom surface 11a1 of the recess 11a, or on the bottom surface 11a1 of the recess 11a. For example, the heat transfer unit 40 can be bonded to the inner wall of the recess 11b, attached to the inside of the recess 11b via thermal conductive grease (heat dissipation grease), embedded inside the recess 11b by insert molding, or bonded to the bottom surface 11a1 of the recess 11a.

[0027] The heat transfer element 40 is formed from a material with high thermal conductivity. For example, the heat transfer element 40 can be formed from a metal such as aluminum, aluminum alloy, copper, or copper alloy. Furthermore, if the socket 10 is made of metal, or if the heat generated in the light-emitting module 20 is small, the heat transfer section 40 can be omitted.

[0028] The light-emitting module 20 (substrate 21) can be provided on one end of the socket 10. For example, the light-emitting module 20 can be bonded to the heat transfer section 40. If the heat transfer section 40 is omitted, for example, the light-emitting module 20 can be bonded to the bottom surface 11a1 of the recess 11a.

[0029] The light-emitting module 20 includes, for example, a substrate 21, a light-emitting element 22, a frame portion 23, a sealing portion 24, a circuit element 25, and a reflective film 26.

[0030] The substrate 21 is plate-shaped. The planar shape of the substrate 21 (shape when viewed from a direction along the central axis 1a of the vehicle lighting device 1) is, for example, approximately rectangular. The substrate 21 can be formed from inorganic materials such as ceramics (e.g., aluminum oxide or aluminum nitride), or organic materials such as paper phenol or glass epoxy. The substrate 21 may also be a metal core substrate in which the surface of a metal plate is coated with an insulating material. Furthermore, the substrate 21 may have a single-layer structure or a multi-layer structure.

[0031] Furthermore, a wiring pattern 21a is provided on the surface 21b of the substrate 21 opposite to the socket 10 side. The wiring pattern 21a is formed from, for example, a material mainly composed of silver or a material mainly composed of copper. A covering portion can also be provided to cover the wiring pattern 21a and the film-shaped resistor described later. The covering portion may include, for example, a glass material.

[0032] The light-emitting element 22 is provided on the surface 21b of the substrate 21. The light-emitting element 22 is electrically connected to the wiring pattern 21a. At least one light-emitting element 22 can be provided. If multiple light-emitting elements 22 are provided, they can be connected in series.

[0033] The light-emitting element 22 can be, for example, a light-emitting diode, an organic light-emitting diode, a laser diode, or the like.

[0034] The peak wavelength of the light emitted from the light-emitting element 22 is, for example, 600 nm or more and 650 nm. However, the peak wavelength of the light emitted from the light-emitting element 22 can be appropriately changed depending on the application of the vehicle lighting device 1.

[0035] The light-emitting element 22 can be a chip-shaped light-emitting element. If the light-emitting element 22 is a chip-shaped light-emitting element, the light-emitting module 20 can be made smaller, and consequently the vehicle lighting device 1 can be made smaller, compared to cases where the light-emitting element 22 is a surface-mount type light-emitting element such as a PLCC (Plastic Leaded Chip Carrier) type, or a light-emitting element with lead wires such as a bullet-shaped element.

[0036] The light-emitting element 22 can be mounted on the wiring pattern 21a using COB (Chip On Board). The light-emitting element 22 may be an upper electrode type light-emitting element, an upper and lower electrode type light-emitting element, or a flip-chip type light-emitting element.

[0037] The frame portion 23 is provided on the surface 21b of the substrate 21. The frame portion 23 is frame-shaped and surrounds the light-emitting element 22. The frame portion 23 has, for example, the function of reflecting light emitted from the light-emitting element 22 and the function of defining the formation area of ​​the sealing portion 24.

[0038] The outline of the frame portion 23, when viewed from a direction along the central axis 1a of the vehicle lighting device 1, can be approximately rectangular, as shown in Figure 1. The outline of the frame portion 23 can be appropriately changed depending on the number and arrangement of the light-emitting elements 22, the required brightness distribution, etc. For example, the outline of the frame portion 23 may be a circle or an ellipse.

[0039] The material of the frame portion 23 can be, for example, resin. The resin can be a thermoplastic resin such as PBT (polybutylene terephthalate), PC (polycarbonate), PET, nylon, PP (polypropylene), PE (polyethylene), or PS (polystyrene). In this case, if at least one of a white resin and a resin containing light-scattering particles is used, the light incident on the inner wall of the frame portion 23 can be reflected efficiently.

[0040] The frame portion 23 can be formed, for example, by injection molding. The formed frame portion 23 can be bonded to the surface 21b of the substrate 21. Alternatively, the frame portion 23 can also be formed by applying softened resin in a frame shape to the surface 21b of the substrate 21 and then hardening it.

[0041] The sealing portion 24 is provided inside the frame portion 23. The sealing portion 24 is provided so as to cover the area enclosed by the frame portion 23. The sealing portion 24 can be provided on the reflective film 26, which will be described later. The sealing portion 24 is provided so as to cover the light-emitting element 22 and the reflective film 26. The sealing portion 24 contains a light-transmitting resin. The sealing portion 24 is formed, for example, by filling the inside of the frame portion 23 with resin. The resin used for filling is, for example, silicone resin. Furthermore, the sealing portion 24 may also include a phosphor. The type of phosphor can be appropriately changed to obtain a predetermined emission color depending on the application of the vehicle lighting device 1.

[0042] In addition, optical elements may be provided as needed. These optical elements can be provided, for example, on the sealing portion 24. Examples of optical elements include convex lenses, concave lenses, and light guides.

[0043] The circuit element 25 can be a passive or active element used to constitute a light-emitting circuit having a light-emitting element 22. The circuit element 25 is provided, for example, around the frame portion 23 and electrically connected to the wiring pattern 21a. The circuit element 25 may also be provided, for example, in a lighting circuit provided outside the vehicle lighting device 1. This simplifies the configuration of the light-emitting module 20, thereby enabling miniaturization and cost reduction of the vehicle lighting device 1. However, if the circuit element 25 is provided on the light-emitting module 20, it becomes easier to protect the light-emitting module 20 and to make the light-emitting module 20 multifunctional.

[0044] As shown in Figure 1, the circuit element 25 can be, for example, a resistor 25a, a protection element 25b, and a control element 25c. However, the type of circuit element 25 is not limited to those exemplified, and can be appropriately changed depending on the configuration of the light-emitting circuit having the light-emitting element 22. For example, in addition to those mentioned above, the circuit element 25 may also be a capacitor, a positive characteristic thermistor, a negative characteristic thermistor, an inductor, a surge absorber, a varistor, an integrated circuit, a computing element, etc.

[0045] The resistor 25a is provided on surface 21b of the substrate 21. The resistor 25a is electrically connected to the wiring pattern 21a. The resistor 25a can be, for example, a surface-mount resistor, a resistor with leads (metal oxide film resistor), or a film-type resistor formed using a screen printing method. Note that the resistor 25a shown as an example in Figure 1 is a surface-mount resistor.

[0046] The forward voltage characteristics of the light-emitting element 22 vary. Therefore, the resistance value of the resistor 25a connected in series with the light-emitting element 22 is adjusted so that the value of the current flowing through the light-emitting element 22 falls within a predetermined range. If the value of the current flowing through the light-emitting element 22 falls within a predetermined range, it is possible to suppress variations in the brightness (luminous flux, luminance, luminous intensity, illuminance) of the light emitted from the light-emitting element 22.

[0047] If resistor 25a is a surface-mount type resistor or a resistor with leads, select a resistor 25a with an appropriate resistance value according to the forward voltage characteristics of the light-emitting element 22. If resistor 25a is a film-type resistor, the resistance value can be increased by removing a portion of resistor 25a. For example, a portion of the film-type resistor can be easily removed by irradiating it with laser light.

[0048] The protection element 25b is provided on surface 21b of the substrate 21. The protection element 25b is electrically connected to the wiring pattern 21a. The protection element 25b is provided, for example, to prevent reverse voltage from being applied to the light-emitting element 22 and to prevent pulse noise from being applied to the light-emitting element 22 from the reverse direction. The protection element 25b is, for example, a diode or a field-effect transistor. The protection element 25b illustrated in Figure 1 is a surface-mount type diode.

[0049] The control element 25c is provided on the surface 21b of the substrate 21. The control element 25c is electrically connected to the wiring pattern 21a. The control element 25c changes the number of light-emitting elements 22 to be lit according to the voltage (input voltage) applied to the vehicle lighting device 1. The control element 25c may also, for example, switch the voltage applied to the light-emitting elements 22 or perform temperature derating.

[0050] Here, some of the light emitted from the light-emitting element 22 and incident on the interface between the sealing portion 24 and the outside air is reflected at the interface, and some of the reflected light is directed toward the surface 21b of the substrate 21. In this case, the reflectivity of the surface 21b of the substrate 21 with respect to the light emitted from the light-emitting element 22 is lower than the reflectivity of the inner wall of the frame portion 23. Therefore, if the surface 21b of the substrate 21 is exposed inside the frame portion 23, it becomes difficult for the light incident on the surface 21b of the substrate 21 to be emitted from the sealing portion 24. If it becomes difficult for the light incident on the surface 21b of the substrate 21 to be emitted from the sealing portion 24, it becomes difficult to increase the luminous flux of the light-emitting module 20, and consequently, the luminous flux of the vehicle lighting device 1.

[0051] Therefore, as shown in Figure 2, a reflective film 26 is provided to cover the surface 21b of the substrate 21 located inside the frame portion 23. The reflectance of the reflective film 26 with respect to light emitted from the light-emitting element 22 can be made higher than the reflectance of the surface 21b of the substrate 21. If the surface 21b of the substrate 21 located inside the frame portion 23 is covered by the reflective film 26, light directed toward the surface 21b of the substrate 21 can be reflected by the reflective film 26.

[0052] However, simply providing the reflective film 26 is not sufficient to efficiently reflect light directed toward the surface 21b of the substrate 21 located inside the frame portion 23, and consequently, it is not possible to further increase the luminous flux.

[0053] Therefore, in the reflective film 26 according to this embodiment, in order to efficiently reflect light incident on the reflective film 26, the variation in the in-plane distribution of light-scattering particles 26a contained in the reflective film 26 is reduced, and the concentration of light-scattering particles 26a is optimized.

[0054] The reflective film 26 can be formed by softening a highly reflective material, supplying the softened material to the surface 21b of the substrate 21 exposed inside the frame portion 23, and hardening the supplied material. The material can be softened by, for example, adding a solvent or heating. The softened material can be supplied by, for example, using a dispenser.

[0055] There are no particular limitations on the thickness of the reflective film 26. For example, it is sufficient that the surface 21b of the substrate 21 is not exposed from the reflective film 26, and the light-emitting surface of the light-emitting element 22 is exposed from the reflective film 26.

[0056] The highly reflective material used to form the reflective film 26 includes, for example, a resin 26b and a plurality of light-scattering particles 26a. The resin 26b can be a binder resin. Here, the light-emitting element 22 emits ultraviolet light along with visible light. Since the ultraviolet light emitted from the light-emitting element 22 also enters the reflective film 26, it is preferable that the resin 26b has high resistance to ultraviolet light.

[0057] Furthermore, the vehicle lighting device 1 is subjected to vibrations associated with driving. Also, when the light-emitting element 22 is lit, heat is generated along with the light. For this reason, it is preferable that the resin 26b be such that the reflective film 26 is less likely to peel off from the surface 21b of the substrate 21 even when external forces such as vibrations are applied or when thermal stress is generated.

[0058] Furthermore, a sealing portion 24 is provided inside the frame portion 23, on top of the reflective film 26. Therefore, considering the bonding strength between the reflective film 26 and the sealing portion 24, it is preferable that the resin 26b has high affinity with the resin contained in the sealing portion 24. Considering the above, for example, it is preferable that resin 26b be a silicone resin.

[0059] The light-scattering particles 26a can be, for example, particles containing a metal oxide. The metal oxide can be, for example, titanium oxide, tin oxide, zinc oxide, etc.

[0060] Here, by diffusing light-scattering particles 26a into the softened resin 26b, it is possible to suppress large variations in the in-plane distribution of light-scattering particles 26a contained in the formed reflective film 26. If the variations in the in-plane distribution of light-scattering particles 26a can be reduced, the light incident on the reflective film 26 can be reflected efficiently.

[0061] In this case, if the median diameter of the light-scattering particles 26a is set to 1 μm or less, it becomes easier to diffuse the light-scattering particles 26a into the softened resin 26b, thereby reducing the variation in the in-plane distribution of the light-scattering particles 26a contained in the reflective film 26.

[0062] Here, the smaller the median diameter of the light-scattering particles 26a, the easier it is to diffuse the light-scattering particles 26a into the softened resin 26b. However, if the median diameter of the light-scattering particles 26a is made too small, the light-scattering particles 26a become more likely to float in the working environment atmosphere. If the light-scattering particles 26a become more likely to float in the working environment atmosphere, managing the working environment becomes complicated. In this case, if the median diameter of the light-scattering particles 26a is set to 0.01 μm or larger, it is possible to suppress the floating of the light-scattering particles 26a in the working environment atmosphere.

[0063] Therefore, it is preferable that the median diameter of the light-scattering particle 26a be between 0.01 μm and 1 μm.

[0064] Figure 3 is a micrograph illustrating the distribution of light-scattering particles 26a in the reflective film 26. Figure 3 shows the case where the light-scattering particle 26a contains titanium dioxide and has a median diameter of 0.1 μm. The resin 26b is a silicone resin.

[0065] If the median diameter of the light-scattering particles 26a is set to 0.01 μm or more and 1 μm or less, the variation in the in-plane distribution of light-scattering particles 26a contained in the reflective film 26 can be reduced, as can be seen from Figure 3.

[0066] Here, it is thought that increasing the concentration of light-scattering particles 26a in the reflective film 26 makes it easier to reflect light incident on the reflective film 26, thus increasing the total luminous flux ratio of the light emitted from the sealing portion 24. However, according to the inventors' findings, it has been found that if the concentration of light-scattering particles 26a is increased too much, the total luminous flux ratio of the light emitted from the sealing portion 24 actually decreases.

[0067] Figure 4 is a graph illustrating the relationship between the concentration of light-scattering particles 26a in the reflective film 26 and the total luminous flux ratio of the light emitted from the sealing portion 24. Figure 4 shows the case where the light-scattering particle 26a contains titanium dioxide and has a median diameter of 0.1 μm. The resin 26b is a silicone resin.

[0068] In Figure 4, "·" represents the case where the concentration of light-scattering particles 26a is 15 vol%. "△" represents the case where the concentration of light-scattering particles 26a is 14 vol%. "×" represents the case where the concentration of light-scattering particles 26a is 10 vol%. "+" represents the case where the concentration of light-scattering particles 26a is 9 vol%.

[0069] As can be seen from Figure 4, if the concentration of light-scattering particles 26a in the reflective film 26 is set to 10 vol% or more and 14 vol% or less, the total luminous flux ratio of the light emitted from the sealing portion 24 can be increased.

[0070] As explained above, if the median diameter of the light-scattering particles 26a in the reflective film 26 is set to 0.01 μm or more and 1 μm or less, and the concentration of the light-scattering particles 26a in the reflective film 26 is set to 10 vol% or more and 14 vol% or less, light directed toward the surface 21b of the substrate 21 located inside the frame portion 23 can be efficiently reflected. Therefore, it is possible to further increase the luminous flux of the light-emitting module 20, and consequently, further increase the luminous flux of the vehicle lighting device 1.

[0071] (Vehicle lighting fixtures) In one embodiment of the present invention, a vehicle lighting fixture 100 equipped with a vehicle lighting device 1 can be provided. The above-described vehicle lighting device 1 and its variations (for example, those in which a person skilled in the art has appropriately added, deleted, or modified components, and which possess the features of the present invention) can all be applied to the vehicle lighting fixture 100.

[0072] In the following explanation, we will use the example that the vehicle lighting fixture 100 is a front combination light installed on an automobile. However, the vehicle lighting fixture 100 is not limited to a front combination light installed on an automobile. The vehicle lighting fixture 100 can be any vehicle lighting fixture installed on an automobile, railway vehicle, etc.

[0073] Figure 5 is a schematic partial cross-sectional view illustrating a vehicle lighting fixture 100. As shown in Figure 5, the vehicle lighting fixture 100 includes, for example, a vehicle lighting device 1, a housing 101, a cover 102, an optical element 103, a sealing member 104, and a connector 105.

[0074] The vehicle lighting device 1 is mounted on the housing 101. The housing 101 holds the mounting portion 11. The housing 101 has a box shape with one end open. The housing 101 is made of, for example, a resin that does not transmit light. A mounting hole 101a is provided on the bottom surface of the housing 101 into which the portion of the mounting portion 11 with the bayonet 12 is inserted. A recess is provided around the periphery of the mounting hole 101a into which the bayonet 12 provided on the mounting portion 11 is inserted. Although the example shows the mounting hole 101a being directly provided on the housing 101, a mounting member having the mounting hole 101a may also be provided on the housing 101.

[0075] When attaching the vehicle lighting device 1 to the vehicle lamp 100, the portion of the mounting part 11 with the bayonet 12 is inserted into the mounting hole 101a, and the vehicle lighting device 1 is rotated. Then, for example, the bayonet 12 is held in place by a fitting portion provided on the periphery of the mounting hole 101a. This type of mounting method is called a twist lock.

[0076] The cover 102 is provided to close the opening of the housing 101. The cover 102 is made of a light-transmitting resin or the like. The cover 102 may also have functions such as a lens.

[0077] Light emitted from the vehicle lighting device 1 is incident on the optical element 103. The optical element 103 performs functions such as reflection, diffusion, guidance, focusing, and formation of a predetermined light distribution pattern of the light emitted from the vehicle lighting device 1. For example, the optical element 103 illustrated in Figure 5 is a reflector. In this case, the optical element 103 reflects the light emitted from the vehicle lighting device 1 to form a predetermined light distribution pattern.

[0078] The sealing member 104 is provided between the flange 13 and the housing 101. The sealing member 104 is annular in shape and is made of an elastic material such as rubber or silicone resin.

[0079] When the vehicle lighting device 1 is attached to the vehicle lamp 100, the sealing member 104 is sandwiched between the flange 13 and the housing 101. Therefore, the sealing member 104 can seal the internal space of the housing 101. In addition, the elastic force of the sealing member 104 presses the bayonet 12 against the housing 101. Therefore, it is possible to prevent the vehicle lighting device 1 from detaching from the housing 101.

[0080] The connector 105 is fitted onto the ends of the multiple power supply terminals 31 that are exposed inside the connector holder 15. The lighting circuit and other components are electrically connected to the connector 105. Therefore, by fitting the connector 105 onto the ends of the multiple power supply terminals 31, the lighting circuit and other components can be electrically connected to the light-emitting element 22.

[0081] Furthermore, the connector 105 is provided with a sealing member 105a. When the connector 105 having the sealing member 105a is inserted into the connector holder 15, the inside of the connector holder 15 is sealed to be watertight.

[0082] Although several embodiments of the present invention have been illustrated above, these embodiments are presented as examples only and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims of the invention and its equivalents. Furthermore, the embodiments described above can be implemented in combination with each other.

[0083] The following are additional notes regarding the embodiments described above.

[0084] (Note 1) Socket and; A substrate provided on one end side of the aforementioned socket; A chip-shaped light-emitting element is provided on the side of the substrate opposite to the socket side; It has a frame-like shape, and the frame portion surrounds the light-emitting element; A reflective film covering the surface of the substrate located inside the frame portion, wherein the reflectivity of the light emitted from the light-emitting element is higher than the reflectivity of the surface of the substrate; It is equipped with, The reflective film comprises a resin and a plurality of light-scattering particles. The median diameter of the aforementioned light-scattering particle is 0.01 μm or more and 1 μm or less. A vehicle lighting device wherein the concentration of light-scattering particles in the reflective film is 10 vol% or more and 14 vol% or less.

[0085] (Note 2) The vehicle lighting device according to Appendix 1, wherein the light-scattering particles include at least one of titanium oxide, tin oxide, and zinc oxide.

[0086] (Note 3) The inside of the frame portion, provided on the reflective film, further comprises a sealing portion containing silicone resin, The vehicle lighting device according to Appendix 1 or 2, wherein the resin contained in the reflective film is a silicone resin.

[0087] (Note 4) The vehicle lighting device according to any one of the appendices 1 to 3, wherein the peak wavelength of the light emitted from the light-emitting element is 600 nm or more and 650 nm or less.

[0088] (Note 5) A vehicle lighting device as described in any one of the appendices 1 to 4; The housing on which the aforementioned vehicle lighting device is mounted; A vehicle lighting fixture equipped with the following features. [Explanation of Symbols]

[0089] 1 Vehicle lighting device, 20 Light-emitting module, 21 Substrate, 21b Surface, 22 Light-emitting element, 23 Frame, 24 Encapsulation, 26 Reflective film, 26a Light-scattering particles, 26b Resin, 100 Vehicle lamp, 101 Housing

Claims

1. Socket and; A substrate provided on one end of the aforementioned socket; A chip-shaped light-emitting element is provided on the side of the substrate opposite to the socket side; It has a frame-like shape and a frame portion that surrounds the light-emitting element; A reflective film covering the surface of the substrate located inside the frame portion, wherein the reflectivity of the reflective film for light emitted from the light-emitting element is higher than the reflectivity of the surface of the substrate; It is equipped with, The reflective film comprises a resin and a plurality of light-scattering particles. The median diameter of the light-scattering particle is 0.01 μm or more and 1 μm or less. A vehicle lighting device wherein the concentration of light-scattering particles in the reflective film is 10 vol% or more and 14 vol% or less.

2. The vehicle lighting device according to claim 1, wherein the light-scattering particles include at least one of titanium oxide, tin oxide, and zinc oxide.

3. The inside of the frame portion, provided on the reflective film, further comprises a sealing portion containing silicone resin, The vehicle lighting device according to claim 1 or 2, wherein the resin contained in the reflective film is a silicone resin.

4. The vehicle lighting device according to claim 1 or 2, wherein the peak wavelength of the light emitted from the light-emitting element is 600 nm or more and 650 nm or less.

5. A vehicle lighting device according to claim 1 or 2; A housing on which the aforementioned vehicle lighting device is attached; A vehicle lighting fixture equipped with the following features.

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