JP2015060791A - Vehicle lighting appliance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle lighting appliance which is favorable in appearance at the non-lighting of a light source while securing high use efficiency with respect to emission light from the light source by a constitution which does not cause a rise of a manufacturing cost.SOLUTION: A reflector 10 which comprises a light reflection face 11 having an effective reflection face region 12 composed of a curved free-form surface which contributes to the formation of a light distribution pattern, and an ineffective reflection face region 13 which is extended forward from the effective reflection face region 12, and does not contribute to the formation of the light distribution pattern is arranged at a lower part of an LED-mounted base board 3 in which a colored layer 5 is formed almost allover entire regions excluding a region which is mounted with an LED 2. At the non-lighting of the LED 2 in the daytime, external light radiated to the ineffective reflection face region 13 of the light reflection face 11 of the reflector 10 is sequentially reflected at the ineffective reflection face region 13, the colored layer 5 of the LED-mounted base board 3, and the effective reflection face region 12 of the light reflection face 11 of the reflector 10, thereby colored light becomes perceptible by an observer, and appearance is improved in terms of a color.

Description

  The present invention relates to a vehicular lamp, and more particularly to a vehicular lamp that has a good appearance when a light source is not lit.

  Conventionally, as this kind of vehicular lamp, the thing of the structure shown in FIG.

It protects the base made of synthetic resin, the undercoat layer that smoothes the rough surface of the base, the aluminum vapor deposition layer that forms the light reflecting surface, and the light reflecting surface around the light source bulb 80 housed in the lamp chamber 82. The reflecting mirror 81 having a four-layer structure composed of a top coat layer that has a transparent top coat layer that is not colored and that contributes to the formation of the reflected light P ₂ is provided. (effective reflective surface) and 81x, but the formation of the reflected light P ₂ having a pigmented top coat layer does not directly contribute, non-effective reflecting mirror unit at the request of the structural or design (non-effective reflecting surface) 81y and It is made up of.

Thus, at the time of lighting of the light source bulb 80, it is emitted to the outside through the front lens 83 without outgoing light P ₁ from the light source bulb 80 is reflected by changes tinge in effective reflective surface 81x of the reflecting mirror 81, a non-lighting Sometimes, external light that has entered the lamp chamber 82 from the outside is applied to the ineffective reflection surface 81 y of the reflecting mirror 81, and coloring of the colored topcoat layer is observed from the outside through the front lens 83. As a result, the appearance design when the light source bulb 80 is turned on and when the light source bulb 80 is not turned on is differentiated in color, thereby improving the appearance when the light source bulb 80 is turned off.

  Patent Document 2 discloses a vehicular lamp having the configuration shown in FIG.

  It is provided with a decorative portion 91 in which coat portions and non-coat portions are alternately arranged on the outer surface of an outer lens 90 made of a red transparent resin base material 93 formed of a red transparent resin member. . The coat part has a three-layer structure composed of a metal layer with a highly reflective metal, a colored layer with a color pigment, and a top coat layer made of a silicone polymer film, and the non-coat part has no multilayer structure and is transparent in red The resin base material 93 is exposed.

  As a result, when the light source bulb 92 is turned on, the light emitted from the light source bulb 92 passes through the red transparent resin base material 93 of the outer lens 90 and then passes through the non-coated portion of the decorative portion 91 and is emitted to the outside. Red light that has been color-converted by the transparent resin base material 93 is observed, and when it is not lit, external light that has entered the decorative portion 91 is reflected by the metal layer of the coat portion, and the reflected light passes through the colored layer and is colored. Light is observed. As a result, a different appearance is provided between when the light source bulb 92 is lit and when it is not lit.

JP 2001-273804 A JP 2010-192217 A

  By the way, the vehicular lamp of the above-mentioned Patent Document 1 includes two reflectors 81 having a four-layer structure, that is, an effective reflector portion 81x having a non-colored transparent topcoat layer and a non-effective reflector portion 81y having a colored topcoat layer. One area needs to be formed. For this reason, the number of manufacturing steps for the reflecting mirror 81 is increased, which increases the manufacturing cost.

  On the other hand, when the light source bulb 92 is lit, the vehicular lamp of the cited document 2 is light that reaches the coat portion of the decorating portion 91 after passing through the red transparent resin base material 93 from the light emitted from the light source bulb 92. It is reflected by the metal layer constituting the part, passes through the red transparent resin base material 93 again, and returns into the lamp chamber 94. Therefore, the utilization efficiency of the light emitted from the light source bulb 92 is low.

  Accordingly, the present invention has been made in view of the above problems, and the object of the present invention is to ensure high utilization efficiency for light emitted from a light source by a configuration that does not cause an increase in manufacturing cost. An object of the present invention is to provide a vehicular lamp that has a good appearance when the light source is not lit.

  In order to solve the above-mentioned problem, the invention described in claim 1 of the present invention is provided in a lamp chamber composed of a housing having an opening and a closed space formed by a front lens mounted so as to close the opening of the housing. An LED mounting board on which an LED is mounted and a reflector having a light reflecting surface are accommodated, wherein the LED mounting board is provided with a colored layer on the mounting surface of the LED, and the reflector Is an effective reflective surface area that is formed of a curved free-form surface that contributes to the formation of the light distribution pattern and is open toward the irradiation direction, and an irradiation direction from the edge of the effective reflection surface area that does not contribute to the formation of the light distribution pattern. A light reflecting surface having a non-effective reflecting surface region that is extended while being inclined upward toward the LED, and the LED mounting surface of the LED mounting substrate and the light reflecting surface of the reflector are Outside light that is transmitted through the front lens and enters the lamp chamber and reaches the ineffective reflection surface region of the light reflection surface, the ineffective reflection surface region, and the colored layer of the LED mounting substrate. The colored reflected light that is sequentially reflected by the effective reflecting surface area of the light reflecting surface and colored by the colored layer passes through the front lens and is emitted to the outside.

  According to a second aspect of the present invention, in the first aspect of the present invention, the ineffective reflection surface area of the light reflection surface is substantially parallel to the road surface in the state in which the vehicle lamp is mounted on the vehicle and front and rear. An inclination angle with respect to a straight line extending in the direction is relative to the straight line of the light ray that travels the most ineffective reflection surface region side of the reflected light emitted from the LED and reflected toward the front lens in the effective reflection surface region. It is characterized by being smaller than the inclination angle.

  The invention described in claim 3 of the present invention is characterized in that, in claim 1 or 2, the front lens is formed of a colorless and transparent member.

  The vehicular lamp of the present invention has an LED mounting substrate in which a colored layer is provided on the LED mounting surface, an effective reflection surface region that contributes to the formation of a light distribution pattern, and an ineffective reflection surface region that does not contribute to the formation of the light distribution pattern. The reflector provided with the light reflection surface was provided, and the LED mounting surface of the LED mounting substrate and the light reflection surface of the reflector were arranged to face each other.

  As a result, when the LED light source is not lit, outside light that has reached the ineffective reflection surface area of the light reflection surface is sequentially reflected by the ineffective reflection surface area, the colored layer of the LED mounting substrate, and the effective reflection surface area of the light reflection surface. Then, the colored reflected light colored with the colored layer is emitted to the outside.

  As a result, it is possible to provide a vehicular lamp having a good appearance when the light source is not lit while ensuring high utilization efficiency with respect to the light emitted from the light source by a configuration that does not cause an increase in manufacturing cost. Become.

It is a longitudinal section of a vehicular lamp of an embodiment. It is optical path explanatory drawing of the emitted light from LED in the vehicle lamp of embodiment. It is an optical path explanatory view of the external light which entered into the vehicular lamp of the embodiment. It is explanatory drawing of a prior art example. Similarly, it is explanatory drawing of a prior art example.

  Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3 (the same parts are denoted by the same reference numerals). The embodiments described below are preferable specific examples of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention particularly limits the present invention in the following description. Unless stated to the effect, the present invention is not limited to these embodiments.

  FIG. 1 is a longitudinal sectional view of a vehicular lamp according to the embodiment, FIG. 2 is an explanatory diagram of an optical path of light emitted from an LED in the vehicular lamp according to the embodiment, and FIG. 3 is a diagram of external light incident on the vehicular lamp according to the embodiment. It is an optical path explanatory drawing.

  The terms “vertical direction”, “left / right direction”, and “front / rear direction” used in the following description of the vehicle lamp are used in the state where the vehicle lamp is mounted on the vehicle. The directions are “vertical direction”, “width direction of the vehicle”, and “front-rear direction of the vehicle”.

  As shown in FIG. 1, the vehicular lamp 1 (hereinafter abbreviated as “lamp”) includes a light source LED 2 and an LED 2 in a lamp chamber 40 formed of a closed space formed by a housing 20 and a front lens 30. The LED mounting board 3 is mounted, and the reflector 10 reflects the emitted light from the LED 2 toward the front lens 30.

  Among them, the LED mounting board 3 is disposed substantially parallel to the road surface in a state where the lamp 1 is mounted on the vehicle, and the LED 2 is mounted on the surface facing the road surface direction (downward) and the LED 2 is mounted. A colored layer 5 made of, for example, a color resist is formed on the surface (LED mounting surface) 4.

  The colored layer 5 is formed by, for example, a coating method such as screen printing, and a configuration in which a colored layer such as blue or yellow is directly provided on the LED mounting substrate 3, and a two-layer configuration in which a colored layer other than white is provided on the white layer Or the structure which provides colored layers, such as blue and yellow, on a light reflection layer, etc. can be considered.

  The reflector 10 is positioned in the light emitting direction (downward) of the LED 2, and a light reflecting surface 11 is formed over substantially the entire surface facing the LED 2, and the light reflecting surface 11 is emitted light from the LED 2. And the reflected light is emitted to the outside through the front lens 30 to form a light distribution pattern, and the light emitted from the LED 2 is reflected and the reflected light contributes to the formation of the light distribution pattern. The non-effective reflection surface area 13 is not provided.

The effective reflection surface area 12 is formed of, for example, a free-form surface based on a paraboloid of revolution, and is recessed in a curved surface on the opposite side of the LED 2 so as to surround the LED 2 and toward the front (irradiation direction). and presents an open shape, the non-effective reflecting surface area 13, from the edge of the effective reflective surface area 12, with respect to the straight line X ₁ extending along the road substantially parallel to and longitudinal direction, towards the front θ The substantially planar shape extended so that the straight line Y inclined to the LED2 side at this angle may be included. The non-effective reflection surface area is included in an area called an extension in the vehicular lamp.

  The front lens 30 is formed of a colorless and transparent member, is exposed to the outside of the vehicle body when the lamp 1 is mounted on the vehicle, and is emitted from the LED 2 and reflected by the effective reflection surface region 12 of the light reflection surface 11 of the reflector 10. The design surface region 31 through which light passes is formed in a uniform thick plate shape that is not subjected to lens cutting.

    Next, the lamp 1 having the above configuration will be optically described with reference to FIGS.

  First, from FIG. 2 (partially enlarged view of FIG. 1), the light emitted from the LED 2 and directed to the effective reflecting surface region 12 of the light reflecting surface 11 of the reflector 10 is an effective free-form surface based on a rotating paraboloid. The light is reflected by the reflecting surface region 12 and is emitted to the outside through the colorless and transparent design surface region 31 of the front lens 30, and a predetermined light distribution pattern is formed by the emitted light.

At this time, the light reflected by the effective reflecting surface area 12 of the light reflecting surface 11 of the reflector 10 is emitted from the LED2 has light L ₁ proceeding to the most non-effective reflecting surface region side, the road surface substantially parallel to and before and after towards the angle alpha ₁ only LED2 side inclined direction (tilt direction) with respect to a straight line X ₁ extending along the direction.

The ineffective reflection surface region 13 of the light reflection surface 11 of the reflector 10 travels on the most ineffective reflection surface region side of the reflected light emitted from the LED 2 and reflected by the effective reflection surface region 12 of the light reflection surface 11 of the reflector 10. is set based on the inclination angle alpha ₁ relative to the straight line X ₁ of the light beam L _1, the most non-effective reflecting surface region side of the light reflected by the tilt angle θ is effective reflective surface area 12 with respect to the straight line X ₁ of the non-effective reflecting surface area 13 smaller than the inclination angle alpha ₁ of the light beam L ₁ proceeding are set (θ <α ₁₎ so as. Thereby, when the LED 2 is turned on, the reflected light emitted from the LED 2 and reflected by the effective reflection surface region 12 of the light reflection surface 11 of the reflector 10 is directly blocked by the non-effective reflection surface region 13 without being blocked by the front lens 30. And the utilization efficiency of the light emitted from the LED 2 is ensured satisfactorily.

  Next, regarding the optical difference between the lamp having the above configuration (hereinafter referred to as “Example”) and the lamp having the conventional configuration (hereinafter referred to as “Comparative Example”) when the LED 2 is not lit, This will be described in detail with reference to FIG. 3 (partially enlarged view of FIG. 1). The difference in configuration between the example and the comparative example is that the disposition direction of the ineffective reflection surface area of the reflection surface of the reflector is different, the color layer 5 is present in the example, and the color layer 5 is not present in the comparative example. It is.

Specifically, the non-effective reflecting surface area 13 of the embodiment as described above, with respect to the straight line X ₁ extending along the edge of the effective reflective surface area 12, the road surface substantially parallel to and the front-forward A substantially planar shape is formed so as to include a straight line Y inclined toward the LED 2 at an angle θ toward.

On the other hand, the non-effective reflecting surface area 60 of the comparative example, the edge portion of the effective reflective surface area 12, a substantially planar shape that is configured to include a straight line X ₁ extending along the road substantially parallel to and the front-rear direction Presents.

Therefore, the external light L ₃ that has passed through the same optical path and passed through the design surface region 31 of the front lens 30 and entered the lamp chamber 40 reaches the ineffective reflection surface region 13 in the embodiment, and in the comparative example, The non-effective reflection surface area 60 is reached.

The reflected light L ₄ (indicated by a solid line) that reaches the ineffective reflection surface region 13 of the embodiment and is reflected by the ineffective reflection surface region 13 and the ineffective reflection surface region 60 of the comparative example reaches the ineffective reflection surface region. All of the reflected light L ₅ (indicated by a broken line) reflected by the region 60 is directed to the LED mounting substrate 3. The reflected light L _{4 of the} example is reflected by the colored layer 5 provided on the LED mounting substrate 3 and becomes reflected light L ₆ that has obtained a desired coloration, and travels toward the effective reflective surface region 12. The comparative example does not include a colored layer, and the reflected light L ₅ is reflected on the surface of the LED mounting substrate 3 itself to become reflected light L ₇ and travels toward the effective reflection surface region 12. The reflected light L ₆ and the reflected light L ₇ are reflected by the effective reflecting surface region 12 toward the design surface region 31 of the front lens 30 and are emitted to the outside through the design surface region 31.

Therefore, when the lamp 1 is viewed from the front, the LED mounting board 3 reflected on the effective reflection surface region 12 of the light reflection surface 11 of the reflector 10 is reflected via the reflected light L ₆ and L ₇ from the effective reflection surface region 12. Is recognized. Here, the reflected light L _{6 of the} example passes through the colored layer 5 on the LED mounting substrate 3 to become reflected light with a desired coloration, and is recognized as colored reflection on the effective reflection surface region 12.

In this case, the non-effective reflection surface region 13 of the example is inclined toward the LED 2 with respect to the non-effective reflection surface region 60 of the comparative example. Therefore, the reflection angle γ ₁ of the reflected light that enters the lamp chamber 40 through the design surface region 31 of the front lens 30 and is reflected by the ineffective reflection surface region 13 of the embodiment with respect to the straight line Z along the vertical direction is the same. The reflected light that has entered the lamp chamber 40 along the optical path and is reflected by the non-effective reflection surface region 60 of the comparative example is larger than the reflection angle γ _{2 with} respect to the straight line Z along the vertical direction (γ ₁ > γ ₂ ). .

Therefore, after being reflected by the non-effective reflection surface region 13 and the non-effective reflection surface region 60, the LED lens is sequentially reflected by the effective reflection surface region 12 of the light reflection surface 11 of the LED mounting substrate 3, the colored layer 5 and the reflector 10, and the front lens. The colored light L ₁₀ of the example and the colored light L ₁₁ of the comparative example emitted to the outside through the 30 design surface regions 31 are more or less parallel to the road surface in the colored light L ₁₀ than the colored light L _11. proceeds in a direction approaching to the straight line X ₄ extending along the direction.

In other words, colored light L ₁₀ examples are emitted to the front side of the lamp 1 than the reflected light L ₁₁ of the comparative example. Therefore, when the lamp when the LED light source is not lit in the daytime is viewed from the front front vicinity, the lamp of the example is an effective reflective surface of the colored layer formed on the LED mounting substrate 3 with respect to the lamp of the comparative example. Reflection of coloring in the region 12 is noticeable, and it is possible to provide a visually improved appearance to the viewer.

  As described above, the vehicular lamp according to the present invention has a good appearance when the light source is not lit while ensuring high utilization efficiency with respect to the light emitted from the light source, by a configuration that does not increase the manufacturing cost. A vehicular lamp can be provided.

1 ... Vehicle lamp 2 ... LED
DESCRIPTION OF SYMBOLS 3 ... LED mounting board 4 ... LED mounting surface 5 ... Colored layer 10 ... Reflector 11 ... Light reflection surface 12 ... Effective reflection surface area | region 13 ... Non-effective reflection surface area | region 20 ... Housing 30 ... Front lens 31 ... Design surface area | region 40 ... Light Room

Claims (3)

An LED mounting substrate on which an LED is mounted and a reflector on which a light reflecting surface is formed are housed in a lamp chamber formed by a housing having an opening and a closed space formed by a front lens mounted so as to close the opening of the housing. A vehicular lamp,
The LED mounting substrate is provided with a colored layer on the mounting surface of the LED,
The reflector is formed from a curved free-form surface that contributes to the formation of a light distribution pattern, and an effective reflection surface region that opens toward the irradiation direction, and from the edge of the effective reflection surface region that does not contribute to the formation of the light distribution pattern. A light reflecting surface having a non-effective reflecting surface region of a shape extended while being inclined upward toward the irradiation direction;
The LED mounting surface of the LED mounting substrate and the light reflecting surface of the reflector are arranged to face each other.
External light that has passed through the front lens and entered the lamp chamber and reached the ineffective reflection surface area of the light reflection surface is reflected by the ineffective reflection surface area, the colored layer of the LED mounting substrate, and the light reflection surface. A vehicular lamp characterized in that colored reflected light that is sequentially reflected by an effective reflecting surface region and colored by the colored layer passes through the front lens and is emitted to the outside.   An inclination angle of the ineffective reflection surface area of the light reflection surface with respect to a straight line extending substantially parallel to the road surface and along the front-rear direction in a state where the vehicle lamp is mounted on the vehicle is emitted from the LED and the effective reflection is performed. 2. The vehicular lamp according to claim 1, wherein a reflected light reflected toward the front lens in a surface region is smaller than an inclination angle of a light ray traveling most in the ineffective reflection surface region side with respect to the straight line.   The vehicular lamp according to claim 1, wherein the front lens is formed of a colorless and transparent member.

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