JP2015076310A - Vehicle lighting appliance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle lighting appliance which can enhance the appearance of a light distribution as a lighting appliance by actively utilizing color-separated light as light for decoration.SOLUTION: A vehicle lighting appliance 1 comprises an LED light source 2 constituted of a blue light LED chip 5 and a fluorescent body layer 6 which covers the blue light LED chip, and a reflector 3 which reflects light from the LED light source 2. The reflector 3 is constituted of a light guide, an internal face of the light guide 3 is made to be a reflection face 3a, color-separated yellow light L2 out of light emitted from the LED light source 2 is introduced into the light guide 3 from an incident face 3b of the light guide 3, and emitted from an emission face 3c while being fully reflected. Furthermore, the incident face 3b which opposes the LED light source 2 of the light guide 3 is arranged within an emission range of the color-separated yellow light L2, and the incident face 3b is made to be a direct face with respect to an incident direction of incident light from the LED light source 2.

Description

  The present invention relates to a vehicular lamp such as an accessory lamp.

  Conventionally, light bulbs (bulbs) have been exclusively used as light sources for vehicle lamps. Recently, however, LEDs (light emitting diodes) that have high luminous efficiency, low power consumption, and long life are being used. .

  By the way, when using, for example, a white LED as a light source, a white LED that realizes a white color by combining a blue LED and a yellow phosphor is generally used. In such a white LED, a part of the blue light of the blue LED is absorbed and excited by a yellow phosphor and converted into yellow light, and white light is realized by mixing blue light and yellow light.

  In a vehicular lamp that uses a white LED as a light source, a blue LED chip and a yellow phosphor layer (resin layer containing a yellow phosphor) covering the LED chip constitute an LED light source, and white light emitted from the LED light source Is enlarged and projected by a light guide to realize illumination light having a predetermined light distribution pattern. Here, the light guide is a lens body having a reflecting surface that totally reflects incident white light.

  By the way, in such a vehicular lamp, if there is chromaticity variation (color unevenness) in the illumination light emitted from each point of the light emission surface of the LED light source, the color unevenness is applied to the illumination light irradiated from the light guide. There is a problem that it appears as it is and color unevenness occurs in the illumination light. In general, in an LED light source, color unevenness is likely to occur at the end of the light emitting surface.For example, in a vehicular lamp using an LED light source that emits white light using a blue LED chip and a yellow phosphor layer, Light including yellow appears at the boundary (periphery) of white light in the light distribution pattern, and an unintended color-separated illumination area is formed. When color unevenness occurs in the illumination light in this way, even when an object of the same color is illuminated, the appearance of the color differs depending on the position, and the appearance of the light distribution as the lamp is deteriorated.

  Therefore, in Patent Document 1, color dispersion (difference in refractive index for each wavelength) is considered for white light emitted from each light emission point of the light emission surface of the LED light source, and color unevenness is formed at the boundary portion of the light distribution pattern. There has been proposed a vehicular lamp that adjusts (corrects) the shapes of the entrance surface, the reflection surface, and the exit surface of the light guide so as not to occur.

JP 2011-082066 A

  However, as proposed in Patent Document 1, the incident surface of the light guide in consideration of chromatic dispersion (difference in refractive index for each wavelength) for white light emitted from each light emission point of the light emission surface of the LED light source It is actually not easy to adjust (correct) the shapes of the reflecting surface and the emitting surface, and there is a problem that the productivity of the vehicular lamp is reduced.

  The present invention has been made in view of the above problems, and the purpose of the present invention is to actively use the color-separated light for decoration, thereby realizing a novel appearance without providing new parts. An object of the present invention is to provide a vehicular lamp that can be used.

  In order to achieve the above object, an invention according to claim 1 is a vehicle lamp comprising an LED light source including an LED chip and a phosphor layer covering the LED chip, and a reflector that reflects light from the LED light source. The reflector is composed of a light guide, the inner surface of the light guide is used as a reflection surface, and the color-separated light out of the light emitted from the LED light source is introduced into the light guide from the incident surface of the light guide. In this case, the light is emitted from the emission surface while being totally reflected.

  According to a second aspect of the present invention, in the first aspect of the present invention, the incident surface of the ride guide that faces the LED light source is disposed in a color-separated light emission range, and the incident surface is separated from the LED light source. It is characterized by being perpendicular to the incident direction of the incident light.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, a half mirror vapor deposition process is performed on the exit surface of the light guide.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the light guide is made of an original material having the same color as the color-separated light.

  According to the first aspect of the present invention, among the light emitted from the LED light source, the color-separated light is introduced into the light guide that also serves as a reflector and is totally reflected to be emitted from the emission surface. By actively using the lamp as a decoration, it is possible to enhance the appearance of the light distribution as a lamp. And the light of the intended color (light without unevenness of color) can be reflected on the reflecting surface of the reflector and used for an original illumination or the like.

  Further, since the reflector can have the function of a light guide, it is not necessary to provide a new light guide separately, and the number of parts of the vehicular lamp can be reduced to reduce the cost.

  According to the second aspect of the present invention, the incident surface facing the LED light source of the ride guide is disposed in the color-separated light emission range, and the incident surface is set with respect to the incident direction of the incident light from the LED light source. Since the surface is straight, the incident efficiency of the color-separated light to the light guide is increased, and most of the color-separated light can be efficiently guided to the ride guide.

  According to the third aspect of the present invention, since the exit surface of the light guide is subjected to the half mirror vapor deposition process, the exit surface looks metallic when the vehicle lamp is not lit, and the color of the light whose exit surface is color-separated when lit. The decorativeness is further enhanced.

  According to the fourth aspect of the present invention, since the light guide is made of the original material having the same color as the color-separated light, the color tone of the color-separated light is emphasized.

It is a front view of the vehicular lamp principal part concerning the present invention. It is the sectional view on the AA line of FIG. It is the B section enlarged detail drawing of FIG. It is detail drawing of the LED light source part of the vehicle lamp which concerns on this invention.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 is a front view of a main part of a vehicular lamp according to the present invention, FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, FIG. 3 is an enlarged detail view of a B part of FIG. It is detail drawing of the LED light source part of a lamp.

  A vehicular lamp 1 according to the present embodiment is an accessory lamp of a vehicle, and includes an LED light source 2 and an LED in a lamp chamber defined by a housing (not shown) and an outer lens (not shown) that covers the opening. A reflector 3 that reflects light from the light source 2 is accommodated.

  The LED light source 2 emits white light. As shown in detail in FIG. 4, the cavity 2A, the blue LED chip 5 mounted on the bottom of the inner surface of the cavity 2A, and the blue LED chip 5 And a phosphor layer 6 covering the surface. Here, the phosphor layer 6 is made of a resin containing a yellow phosphor and fills the haze cavity 2A. The LED light source 2 is mounted on a rectangular flat substrate 4.

  The reflector 3 is constituted by a light guide having a rotating parabolic cylinder shape, and the inner surface of the rotating parabolic curved surface is a reflecting surface 3a subjected to a reflection process such as aluminum vapor deposition. In the following description, the same reference numerals as those of the reflector 3 are used for the light guide. Here, a polycarbonate (PC) resin having a high light guiding function is used for the light guide 3.

  As shown in FIG. 2, the LED light source 2 faces a hole formed at the center of the light guide 3, and the surface of the light guide 3 facing the LED light source 2 forms an incident surface 3b. An end surface of the periphery of the opening of the light guide 3 constitutes an emission surface 3c.

  By the way, when the LED light source 2 that emits white light is turned on, a part of the blue light emitted from the blue LED chip 5 is absorbed and excited by the yellow phosphor of the phosphor layer 6 and converted into yellow light. White light is emitted from the LED light source 2 by mixing yellow and yellow light.

  In such an LED light source 2, color unevenness is likely to occur at the end of the light emitting surface, and yellow light that has undergone color separation appears at the boundary (periphery) of white light in the light distribution pattern, and unintended color separation of yellow light occurs. As described above, there is a problem that an illumination area is formed. Specifically, as shown in FIG. 2, the white light L1 has a 50 ° angle range around the optical axis X, and the color-separated yellow light L2 is an LED light source as shown in FIG. An angle range of 30 ° from a plane orthogonal to the optical axis X passing through the two light emission surfaces is an emission region.

  Therefore, in the present embodiment, as shown in FIG. 2, the ride guide 3 is incident on the angle range of 40 ° outside the emission region of the white light L1, with a margin of the angle range of 10 ° in the emission region of the yellow light L2. The surface 3b is arranged so that yellow light L2 in this angular region is incident on the inside of the light guide 3 from the incident surface 3a. Here, as shown in detail in FIG. 3, the incident surface 3 a of the light guide 3 is an arcuate curved surface (centered on the LED light source 2) so as to be perpendicular to the incident direction of the yellow light L <b> 2 from the LED light source 2. Arc curved surface).

  Thus, in the vehicular lamp 1 according to the present embodiment, the white light L1 emitted from the LED light source 2 within the angle range of 50 ° shown in FIG. 2 is reflected by the reflecting surface 3a on the inner surface of the light guide 3. It becomes parallel light, passes through an outer lens (not shown), is irradiated to the front of the vehicle (left side in FIG. 2), and is used for the original illumination of the vehicular lamp 1.

  On the other hand, the yellow light L2 emitted from the angle range of 30 ° shown in FIG. 4 is incident on the inside of the light guide 3 from the incident surface 3b of the light guide 3, and inside the light guide 3 as shown in FIG. Then, the light travels in the direction of the exit surface 3c while being totally reflected, and finally exits from the exit surface 3c. Thus, in the vehicular lamp 1 according to the present embodiment, out of the light emitted from the LED light source 2, the color-separated yellow light L2 is introduced into the light guide 3 that also serves as a reflector, and is totally reflected. Since it is made to radiate | emit from 3c, the appearance of the light distribution as a lamp | ramp can be improved by utilizing actively the color-separated yellow light L2 for decoration. In this case, since the inner surface of the light guide 3 constitutes the reflection surface 3a, total reflection of the yellow light L2 within the light guide 3 is ensured.

  Further, in the vehicular lamp 1 according to the present embodiment, since the reflector 3 can have the function of a light guide, it is not necessary to newly provide a light guide, and the number of parts can be reduced and the cost can be reduced. The effect that it can plan is also acquired.

  Furthermore, in the vehicular lamp 1 according to the present embodiment, the emission range of the yellow light L2 color-separated from the incident surface 3b of the ride guide 3 facing the LED light source 2 (an angle range of 40 ° shown in FIG. 2). In addition, the incident surface 3b is made flat with respect to the incident direction of the yellow light L2 from the LED light source 2, so that the incident efficiency of the color-separated yellow light L2 to the light guide 3 is increased, and the yellow light L2 Can be efficiently guided to the ride guide 3.

  In addition, if the exit surface 3c of the light guide 3 is subjected to a half mirror vapor deposition process, the exit surface 3c looks metallic when the vehicular lamp 1 is not lit, and the exit surface 3c looks yellow when the vehicle lamp 1 is lit. Enhanced. Further, if the light guide 3 is composed of a yellow original material having the same color as the color-separated yellow light L2, the color tone of the yellow light L2 can be enhanced.

DESCRIPTION OF SYMBOLS 1 Vehicle lamp 2 LED light source 2A Cavity 3 Light guide (reflector)
3a Light guide reflecting surface 3b Light guide incident surface 3c Light guide emitting surface 4 Substrate 5 Blue LED chip 6 Phosphor layer L1 White light L2 Yellow light X Optical axis

Claims (4)

In a vehicle lamp comprising an LED light source composed of an LED chip and a phosphor layer covering the LED chip, and a reflector that reflects light from the LED light source,
The reflector is composed of a light guide, the inner surface of the light guide is used as a reflection surface, and the color-separated light out of the light emitted from the LED light source is introduced into the light guide from the incident surface of the light guide. A vehicular lamp characterized by being configured to emit light from an exit surface while being totally reflected.   An incident surface facing the LED light source of the ride guide is disposed in a color-separated light emission range, and the incident surface is set to be perpendicular to an incident direction of incident light from the LED light source. The vehicular lamp according to claim 1.   The vehicular lamp according to claim 1 or 2, wherein a half mirror deposition process is performed on an emission surface of the light guide. The vehicular lamp according to any one of claims 1 to 3, wherein the light guide is made of an original material having the same color as the color-separated light.

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