JP6984516B2 - Vehicle lighting - Google Patents

Description

The present invention relates to a vehicle lamp, and more particularly to the structure of an extension provided around the lamp.

Vehicle lighting equipment such as headlights and taillights is provided in automobiles. In vehicle lamps, the lamp is housed in a housing that is recessed inward from a hole drilled in the body. The opening of the housing facing the outside from the body is covered with an outer lens, and the light emitted by the lamp passes through the outer lens and is radiated from the car. Vehicle lighting fixtures have a space surrounded by an outer lens and a housing, and depending on the structure of this space and the state of air, moisture may condense and the outer lens may become cloudy.

Various techniques have been conventionally proposed for this problem. For example, the following Patent Documents 1 and 2 describe that the structure inside the housing of a vehicle lamp is a structure for adjusting the air flow to prevent fogging of the outer lens. Patent Document 1 discloses a structure for preventing fogging of an outer lens in a vehicle lamp (automobile lamp) in which two lamps used differently are adjacent to each other. The temperature is lower in the area where the infrequently used high beam lamp is provided than in the area where the frequently used low beam lamp is provided, and the air stagnates in the area on the high beam side of the outer lens. It has been pointed out that there is a problem that it tends to become cloudy. To solve this problem, a structure has been proposed in which a rectifying plate is provided between the lamp for the low beam and the lamp for the high beam to eliminate the stagnation of air.

In the vehicle lighting equipment (vehicle headlight) described in Patent Document 2, the area where the traveling lamp is provided and the area where the passing lamp is provided are separated by a partition plate. As a result, moist air is prevented from flowing from the area on the lamp side that is lit to the lamp side that is off, and dew condensation is prevented, and fogging of the outer lens is prevented.

Japanese Unexamined Patent Publication No. 2004-119198 Japanese Unexamined Patent Publication No. 2012-003958

Generally, a design component called an extension is provided around a lamp of a vehicle lamp. The extension closes the housing opening around the lamp and is covered with the outer lens along with the lamp. There are the following issues regarding the design of extensions. That is, depending on the shape of the extension, the state of painting, and the like, a space where the temperature is lower than that of the adjacent space when illuminated by sunlight is generated between the extension and the outer lens. In such a space, air flows from the adjacent space, moisture is condensed, and the outer lens tends to become cloudy.

An object of the present invention is to prevent fogging of an outer lens of a vehicle lamp equipped with an extension.

The present invention comprises an extension provided around the lamp, an outer lens covering the outside of the extension, a housing covering the inside of the extension, and a vent provided in the extension. The space between the outer lens and the extension and the space between the housing and the extension are communicated with each other, and the extensions are adjacent first and second regions, and are easily warmed by sunlight. The second region is a region that is less likely to be heated by sunlight than the first region, and the vent is provided in the second region. And.

Desirably, the distance from the previous SL second region to the outer lens is not larger than a distance from the first region to the outer lens.

Desirably, the second region is a region recessed inward from the first region.

The present invention also includes an extension provided around the lamp, an outer lens covering the outside of the extension, a housing covering the inside of the extension, and a vent provided in the extension. The space between the outer lens and the extension and the space between the housing and the extension are communicated with each other. adjoin the reflective region comprises a non-reflection areas reflecting processing is not applied to a surface of the outer lens side, the vent is characterized in that provided in the reflective region.

Desirably, the extension has a light blocking structure that is emitted from the lamp into the housing and blocks light toward the vent. The present invention also includes an extension provided around the lamp, an outer lens covering the outside of the extension, a housing covering the inside of the extension, and a vent provided in the extension. The space between the outer lens and the extension and the space between the housing and the extension are communicated with each other, and the extension is emitted from the lamp into the housing and blocks light toward the vent. It is characterized by having a light-shielding structure.

Desirably, the inner surface of the outer lens is coated with anti-fog coating.

Desirably, the housing is provided with a breathing hole that communicates the space between the housing and the extension and the space outside the housing.

Desirably, the inner surface of the housing includes a light diffusing surface that diffusely reflects incident light.

According to the present invention, it is possible to prevent fogging of the outer lens of a vehicle lamp equipped with an extension.

It is a perspective view which shows the lamp for a vehicle together with the car to which it is mounted. It is a perspective view of the lamp for a vehicle which removed the outer lens and the extension. It is a perspective view of an extension. It is a figure which shows the cross section in the AA line shown in FIG. It is a figure which shows the cross section in the BB line shown in FIG. It is a figure which shows the cross section in the CC line shown in FIG. It is a perspective view of the vicinity of a vent. It is a perspective view which looked at the vent from the inside. It is a figure which shows the neighborhood of a vent. It is a figure which shows the cross section of the lamp for a vehicle which concerns on 2nd Embodiment.

A vehicle lamp according to an embodiment of the present invention will be described with reference to each drawing. In the following description, the terms for outward and inward directions refer to the outward and inward directions of the vehicle body. In addition, the terms up, down, left, right, front and back indicate the direction when the light radiation direction is viewed from the vehicle lamp. In the following embodiment in which the vehicle lighting fixture is the headlight of the automobile, the up / down / left / right / front / rear of the vehicle lighting fixture correspond to the up / down / left / right / front / rear as seen from the occupant of the automobile.

FIG. 1 shows a vehicle lamp according to an embodiment of the present invention together with a vehicle on which the lamp is mounted. The vehicle lighting equipment includes a night lamp 14 (hereinafter referred to as a night lamp 14), a housing 12, an extension 16, and an outer lens 18. The night lamp 14 is housed in a housing 12 recessed inward from a hole formed in the body 20 with its radial direction directed forward. An extension 16 is provided around the night lamp 14. The opening of the housing 12 facing the outside from the body 20 is covered by the extension 16, and the outside thereof is covered by the outer lens 18. The light emitted from the night lamp 14 passes through the outer lens 18 and is radiated from the automobile.

FIG. 2 shows a perspective view of a vehicle lamp with the outer lens 18 and the extension 16 removed. The housing 12 is formed in a ship shape deformed along a curved surface in front of the body. The inner surface of the housing 12 has an uneven shape according to the arrangement of each component used for a vehicle lamp.

The front left side of the housing 12 has an inwardly bulging area, and the front surface thereof is provided with a first auxiliary lamp hole 22 and a second auxiliary lamp hole 24 arranged vertically. Auxiliary lamps such as a clearance lamp and a winker lamp are fixed in the first auxiliary lamp hole 22 and the second auxiliary lamp hole 24.

A main lamp hole 26 is provided behind the housing 12. A night lamp is fixed in the main lamp hole 26. As the night lamp, a lamp having both a low beam and a high beam may be used. The bottom wall behind the main lamp hole 26 has a shape forming a part of a cylindrical shape extending rearward, and a space for arranging each component is secured on the outside of the housing 12 behind the main lamp hole 26. ing.

Breathing holes 32 are provided on the front and rear wall surfaces of the bulging region on the left front side to communicate the space inside the housing 12 with the space outside the housing 12. The breathing hole 32 avoids the expansion of the air in the vehicle lamp at high temperature and the mechanical stress applied to each member. If there is a gap between the hole for mounting the component and the component, and there is ventilation between the space inside the housing 12 and the space outside the housing 12, the breathing hole 32 is not always provided. You may.

FIG. 3 shows a perspective view of the extension 16. However, in this figure, the night lamp 14 is shown together with the extension 16. The extension 16 is formed in a ship shape that closes the opening of the housing 12 of FIG. 2, and has a shape provided with a hole through which the night lamp 14 is inserted and an unevenness for decoration.

A front lamp hole 34 through which the night lamp 14 is inserted is provided on the front surface of the extension 16. A tubular structure 36 extending in the front-rear direction is formed around the front lamp hole 34, and a front auxiliary lamp hole 38 for passing the light of the auxiliary lamp is provided on the left side of the tubular structure 36. Edges 50 projecting like embankments are formed on the upper and left sides of the area where the front lamp hole 34, the tubular structure 36, and the front auxiliary lamp hole 38 are provided. The edge 50 extends from the rear to the front on the upper side of the extension 16, folds back at the tip, sandwiches the front auxiliary lamp hole 38, and reaches below the tubular structure 36. From the lower part of the tubular structure 36 to the upper part behind it, a cliff-shaped overhanging region is formed.

FIG. 4 shows a cross section on the AA line shown in FIG. FIG. 5 shows a cross section at the BB line shown in FIG. FIG. 6 shows a cross section at the CC line shown in FIG. However, these cross-sectional views also show an outer lens 18 that covers the front (outside) of the extension 16 and a housing 12 that covers the back (inside) of the extension 16.

In the AA line cross section shown in FIG. 4, the housing 12 extends from the rear to the diagonally front left while bending according to the position of the component to be attached. A breathing hole 32 is provided behind the housing 12. As shown by the alternate long and short dash line, the night lamp 14 is fixed to the main lamp hole 26 of the housing 12. The head of the night lamp 14 projects forward from the front lamp hole 34 provided in the extension 16.

In the AA line cross section, the extension 16 bends to the left as it goes forward from the rear end, forming the right side of the side wall of the tubular structure 36. Further, the extension 16 extends diagonally forward to the left from the inside of the side wall of the tubular structure 36, forms a front lamp hole 34, further extends diagonally forward to the left, and then bends forward to form the left side of the side wall of the tubular structure 36. .. Further, the extension 16 forms a front auxiliary lamp hole 38 in front of the left side of the tubular structure 36, extends diagonally forward to the left, and reaches the left end. The edge 50 projects forward from the region extending from the side wall of the tubular structure 36 to the left end.

In the AA line cross section, the outer lens 18 extends forward along the shape of the extension 16 while warping to the left from the rear end toward the front. The left and right ends of the outer lens 18 are in contact with the left and right edges of the housing 12. The inner surface of the outer lens 18 may be antifogging coated with a paint that prevents fogging.

As shown in the BB line cross section of FIG. 5, U-shaped lens receiving grooves 44 and 46 open outward are formed on the upper edge and the lower edge of the housing 12. The upper edge of the outer lens 18 enters the upper lens receiving groove 44 and is fixed by the adhesive 48. The lower edge of the outer lens 18 enters the lower lens receiving groove 46 and is fixed by the adhesive 48. The outer lens 18 draws a curved surface bulging outward between the upper lens receiving groove 44 and the lower lens receiving groove 46.

In the BB line cross section, the housing 12 extends downward from the upper lens receiving groove 44, and then extends diagonally downward while drawing a curve bulging forward. The space below this area corresponds to the space behind the night lamp. The housing 12 further extends outward and then upwards to reach the lower lens receiving groove 46.

In the BB line cross section, the extension 16 extends diagonally downward outward from the upper end and then extends outward, forming an outwardly convex V-shape to form the edge 50. Below the top of the edge 50, the extension 16 draws an inwardly convex V-shape to form a valley region 52, which bends downward to reach the bottom.

As shown in FIG. 5, the distance from the valley region 52 to the outer lens 18 is larger than the distance from the upper region 54 above the valley region 52 to the outer lens 18. Further, the distance from the valley region 52 to the outer lens 18 is larger than the distance from the lower region 56 below the valley region 52 to the outer lens 18. That is, the upper space 60 sandwiched between the upper region 54 and the outer lens 18 is narrower than the valley space 58 sandwiched between the valley region 52 and the outer lens 18. Similarly, the lower space 62 sandwiched between the lower region 56 and the outer lens 18 is narrower than the valley space 58. The distance from the region on the extension 16 to the outer lens 18 is defined as, for example, the average value of the lengths of the perpendicular lines drawn perpendicularly to the inner surface of the outer lens 18 from each point on the region. Further, this distance may be defined as the length of a perpendicular line drawn from the center of gravity of the region defined on the extension 16 to the inner surface of the outer lens 18. Further, this distance may be defined as the maximum value of the length of a perpendicular line drawn perpendicularly to the inner surface of the outer lens 18 from each point on the region defined on the extension 16.

As described above, since the upper space 60 and the lower space 62 are narrower than the valley space 58, the upper space 60 and the lower space 62 are smaller than the valley space when the vehicle lamp is illuminated by sunlight. The temperature tends to be higher than 58. In general, since air flows from a hot space to a low temperature space, when the lighting equipment for a vehicle is illuminated by sunlight, the air tends to flow from the upper space 60 and the lower space 62 toward the valley space 58. .. Further, when the air flowing into the valley space 58 is cooled, the moisture in the air is dewed and the outer lens 18 is likely to become cloudy. Further, when the inner surface of the outer lens 18 is coated with anti-fog coating, the moisture condensed may dissolve specific components contained in the anti-fog coating material and stain the inner surface of the outer lens 18.

Therefore, as shown in the CC line sectional view of FIG. 6, the vent 66 for communicating the lens-side space between the outer lens 18 and the extension 16 and the housing-side space between the extension 16 and the housing 12. Is provided in the extension 16. The vent 66 guides moist air from the lens-side space to the housing-side space due to the temperature difference generated between the lens-side space and the housing-side space, and suppresses fogging of the outer lens 18. The CC line cross section is a cross section at a position slightly shifted to the left side of the BB line cross section, and the structure of the CC line cross section is almost the same as the structure of the BB line cross section except for the structure around the vent 66.

In the CC line cross section, the extension 16 extends diagonally downward outward from the upper end and then extends outward to form an outwardly convex V-shape to form an edge 50, from which it extends into the housing 12 to form the housing 12. It reaches the lower end of the inside. The extension 16 extends outward again with a space between the edge 50 and the region extending into the housing 12, and bends downward to reach the lower end. A vent 66 is formed between the region extending from the edge 50 into the housing 12 and the region below it extending outward. The region extending into the housing 12 from the upper edge of the vent 66 is part of the light-shielding structure 68 described below.

FIG. 7 shows a perspective view of the vicinity of the vent 66. This perspective view is an enlarged view of the portion surrounded by the circle 40 of the alternate long and short dash line in FIG. At the innermost part of the lower slope of the edge 50, that is, the innermost part of the upper slope of the valley region 52, a rectangular vent 66 long in the lateral direction is provided. FIG. 8 shows a perspective view of the portion shown in FIG. 6 as viewed from the inside. The vent 66 is covered from the inside by a light-shielding structure 68. The light-shielding structure 68 includes a front wall 72, a rear wall 74, a ceiling plate 76, and an inner side wall 78. The outer edge of the anterior wall 72 is in contact with the anterior edge of the vent 66 and the outer edge of the posterior wall 74 is in contact with the posterior edge of the vent 66. The outer edge of the ceiling plate 76 is in contact with the upper edge of the vent 66, and the front and rear edges of the ceiling plate 76 are in contact with the upper edge of the front wall 72 and the upper edge of the rear wall 74, respectively. The upper edge of the inner wall 78 is in contact with the inner edge of the ceiling plate 76, and the front and rear edges of the inner wall 78 are in contact with the inner edge of the front wall 72 and the inner edge of the rear wall 74, respectively. There is. The inner wall 78 extends below the front wall 72 and the rear wall 74. In this way, the front wall 72, the rear wall 74, the ceiling plate 76, and the inner side wall 78 form a hood-like light-shielding structure 68 that opens outward and downward, and covers the inside of the vent 66. The light-shielding structure 68 blocks the light path from any position in the housing to the vent 66. As a result, the light-shielding structure 68 is emitted from the night lamp into the housing and blocks the light toward the vent 66.

FIG. 9 shows an enlarged view of the vicinity of the vent 66 in the cross section of the CC line. A phenomenon that occurs in a vehicle lamp will be described with reference to FIG. 9. When the vehicle lighting fixture is illuminated by sunlight, the upper space 60 and the lower space 62 have a higher temperature than the valley space 58 because the upper space 60 and the lower space 62 are narrower than the valley space 58. It tends to be expensive. The temperature of the upper space 60 and the lower space 62 is higher than that of the valley space 58, so that air flows from the upper space 60 and the lower space 62 toward the valley space 58 as indicated by the arrow 70. It flows. Further, since sunlight does not reach the inside of the housing 12, the temperature of the space inside the housing 12 tends to be lower than that of the valley space 58. Since the temperature of the space inside the housing 12 is lower than that of the valley space 58, the air flowing from the upper space 60 and the lower space 62 toward the valley space 58 is further passed through the vent 66 to the housing 12. Flow in.

The breathing hole 32 (FIG. 4) provided in the housing 12 communicates the space inside the housing 12 with the space outside the housing 12. This facilitates the flow of air in the housing 12, facilitating the phenomenon of air flowing from the upper space 60 and the lower space 62 toward the valley space 58, and further flowing into the housing 12 through the vent 66.

According to such a configuration, the air flowing into the valley space 58 flows into the housing 12 through the vent 66. As a result, moisture in the air is less likely to condense in the valley space 58, and fogging of the outer lens 18 is suppressed. Further, when the inner surface of the outer lens 18 is coated with anti-fog coating, the possibility that the specific component contained in the anti-fog coating material is dissolved by the dew condensation of water and the outer lens 18 is contaminated is reduced.

Further, as shown in FIGS. 4, 6, 8 and 9, since the inside of the vent 66 is covered with the light-shielding structure 68, the light emitted from the night lamp 14 into the housing 12 Is blocked by a light-shielding structure 68 before reaching the vent 66. This prevents the light emitted from the night lamp 14 into the housing 12 from leaking to the outside of the vehicle lamp.

A light diffusion surface may be formed on the inner surface of the housing 12. The light diffusion surface may be a surface on which a fine uneven shape is formed by grain processing, honing processing, or the like. Since the light incident on the light diffusing surface is diffusely reflected, it is possible to prevent the light emitted from the night lamp 14 into the housing 12 from being reflected only toward the vent 66. In this embodiment, as shown in FIGS. 5 and 6, a light diffusion surface 64 is provided near the corner behind the bottom surface of the housing 12.

As described above, in the vehicle lamp according to the present embodiment, for extensions having different distances to the outer lens 18 in the adjacent first region and the second region, the vent 66 is located in the second region having a larger distance to the outer lens 18. Is provided. The upper region 54 and the lower region 56 correspond to the first region, and the valley region 52 corresponds to the second region (FIG. 6). When the inner surface of the outer lens has a planar shape or a gently curved surface shape, the second region may be a region recessed inward from the first region, and a vent is provided in the recessed region inward. Just do it.

In addition to the extension 16 shown in FIG. 3, some vehicle lamp extensions have various uneven shapes depending on the design. When the inner surface of the outer lens has a planar shape or a gently curved surface shape, for a general extension having an uneven shape, a vent may be provided in an inwardly recessed region. Further, when the inner surface of the outer lens has a region recessed outward, a vent may be provided in the region on the extension facing the recessed inner surface.

FIG. 10 shows a cross section of the vehicle lamp according to the second embodiment. This cross section corresponds to the CC line cross section of the above-described embodiment. The same components as those shown in FIGS. 1 to 9 are designated by the same reference numerals to simplify the description thereof. In this vehicle lighting fixture, the extension 90 does not have an edge and a valley region, and the extension 90 draws a curved surface bulging outward. A vent 66 is provided in a region having a curved surface bulging outward, and the inside of the vent 66 is covered with a light-shielding structure 68. The extension 90 extends downward from the vent 66 to the lower end.

The outer surface (the surface on the outer lens 18 side) of the reflection region 82 around the vent 66 is subjected to a reflection process for decoration, and the reflective substance 80 is attached to the outer surface. The reflection process includes, for example, a process of depositing metal and a process of applying a paint that reflects light. The outer surface of the non-reflective region 84 above and below the reflective region 82 is not reflectively processed, and the surface of the material forming the extension 90 is exposed.

When the gap between the extension 90 and the outer lens 18 is constant, the reflection space 86 sandwiched between the reflection region 82 and the outer lens 18 and the non-reflection space 88 sandwiched between the non-reflection region 84 and the outer lens 18 Has the following properties. That is, when the vehicle lamp is illuminated by sunlight, the temperature of the non-reflective space 88 tends to be higher than that of the reflective space 86. This is because the non-reflective region 84 has a higher emissivity (emissivity) than the reflective region 82 and easily absorbs heat from sunlight. Therefore, when the lighting equipment for a vehicle is illuminated by sunlight, there is a strong tendency for air to flow from the non-reflective space 88 toward the reflective space 86.

Therefore, in the vehicle lamp shown in FIG. 10, a vent 66 is provided in the reflection region 82. Due to a phenomenon similar to the phenomenon described with reference to FIG. 9, the air flowing from the non-reflective space 88 into the reflective space 86 flows into the housing 12 through the vent 66. As a result, moisture in the air is less likely to condense in the reflection space 86, and fogging of the outer lens 18 is suppressed. Further, when the inner surface of the outer lens 18 is coated with the anti-fog coating, the possibility that the anti-fog coating is melted by the dew condensation of water and the outer lens 18 is contaminated is reduced.

As described above, in the vehicle lighting equipment according to the present embodiment, the vent 66 is provided in the second region where it is difficult to heat for the extensions whose heating easiness by sunlight is different in the adjacent first region and the second region. It is a thing. Emissivity is a value that indicates the ease of warming by sunlight. The non-reflective region 84 corresponds to the first region, and the reflective region 82 corresponds to the second region. That is, the reflective region 82 as the second region is less likely to be heated by sunlight than the non-reflective region 84 as the first region, and the reflective region 82 is provided with a vent 66.

In addition to the above-mentioned reflective region 82 and non-reflective region 84, the two regions having different warming easiness include two regions painted with paints of different colors. Areas painted with light-colored paint are generally less likely to warm than areas painted with dark-colored paint. Therefore, a vent may be provided in the area painted with the light-colored paint. In addition, the two regions with different warming easiness include two regions formed of substances having different emissivity and two regions subjected to different surface treatments (treatments such as gloss and matting). ..

In the above, an example is shown in which a vehicle lamp is used as a headlight on the right side of an automobile. The headlight on the left side of the automobile has a symmetrical structure with respect to the headlight on the right side. Further, the vehicle lighting fixture according to the present invention may be used as other lighting fixtures such as a tail light and a fog lamp in addition to the headlight.

In the above, the extension used as a design part has been described. Some extensions have the function of a reflector that reflects the light of the lamp forward. The present invention may be used for an extension having a function as a reflector.

12 Housing, 14 Lamps, 16, 90 Extensions, 18 Outer Lens, 20 Body, 22 1st Auxiliary Lamp Hole, 24 2nd Auxiliary Lamp Hole, 26 Main Lamp Hole, 32 Breathing Hole, 34 Front Lamp Hole, 36 Cylindrical Structure, 38 Front auxiliary lamp hole, 44,46 lens receiving groove, 48 adhesive, 50 edge, 52 valley region (second region), 54 upper region (first region), 56 lower region (first region), 58 valley space , 60 Upper space, 62 Lower space, 64 Light diffusion surface, 66 Vent, 68 Shading structure, 72 Front wall, 74 Rear wall, 76 Ceiling plate, 78 Inner side wall, 80 Reflective material, 82 Reflection area (2nd area) ), 84 non-reflective region (first region), 86 reflective space, 88 non-reflective space.

Claims (9)

Extensions around the lamp and
The outer lens that covers the outside of the extension and
A housing that covers the inside of the extension and
With a vent provided in the extension,
The vent communicates the space between the outer lens and the extension and the space between the housing and the extension .
The extension includes a first region and a second region that are adjacent to each other and have different easiness of being warmed by sunlight, and includes a first region and a second region.
The second region is a region that is less likely to be heated by sunlight than the first region.
The vent is a vehicle lighting fixture provided in the second region. In the vehicle lighting equipment according to claim 1,
Before Symbol distance from the second region to the outer lens is a vehicle lamp, wherein the us go larger than a distance from the first region to the outer lens. The vehicle lamp according to claim 2.
A vehicle lamp, wherein the second region is a region recessed inward from the first region. Extensions around the lamp and
The outer lens that covers the outside of the extension and
A housing that covers the inside of the extension and
With a vent provided in the extension,
The vent communicates the space between the outer lens and the extension and the space between the housing and the extension.
The extension includes a reflective region in which the surface on the outer lens side is subjected to reflection processing, and a non-reflective region adjacent to the reflection region in which the surface on the outer lens side is not subjected to reflection processing.
The vent is a vehicle lighting fixture provided in the reflection region. The vehicle lamp according to any one of claims 1 to 4.
The extension is a vehicle lighting tool having a light-shielding structure that is emitted from the lamp into the housing and blocks light toward the vent. Extensions around the lamp and
The outer lens that covers the outside of the extension and
A housing that covers the inside of the extension and
With a vent provided in the extension,
The vent communicates the space between the outer lens and the extension and the space between the housing and the extension.
The extension is a vehicle lighting tool having a light-shielding structure that is emitted from the lamp into the housing and blocks light toward the vent. The vehicle lamp according to any one of claims 1 to 6.
A vehicle lamp having an anti-fog coating on the inner surface of the outer lens. The vehicle lamp according to any one of claims 1 to 7.
A vehicle lamp provided in the housing and having a breathing hole for communicating a space between the housing and the extension and a space outside the housing. The vehicle lamp according to any one of claims 1 to 8.
The inner surface of the housing includes a light diffusing surface that diffusely reflects incident light.

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