JPH08268154A - Lighting fixture for vehicle - Google Patents

Abstract

PURPOSE: To irradiate light from a light source to the back of a reflector with respect to the light source in the lighting fixture for a vehicle, which make use of a total reflection reflector. CONSTITUTION: A total reflection reflector 12 which is integrally formed with a color cap section 13, is provided with an induction section 14 formed by a step 14a in a flat section 12c, and with a permeable section 15 at a paraboloid section 12a. A light out of lights colored by the color cap section 13, which is not made a parallel light in the afterward direction of a vehicle, that is, the major irradiating direction, and is not thereby effective when it is reflected, is reflected at the induction section 14 in such a way as to be injected into the permeable section 15 at an angle less than a specified one. Only a light injected at an angle less than a specified one is permitted to pass through the permeable section 15, and is irradiated in the obliquely forward direction of the vehicle, which is different from the major irradiating direction. And lights other than the aforesaid light are reflected in a form of total reflection. Namely, the light has to be specifically conditioned, by letting only the light satisfying specified conditions selectively pass through the reflector, an interval for the light to sidestep the reflector can thereby be eliminated, and a limit for the reflecting area of the reflector is thereby eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular lamp such as a headlight, a stoplight and a sidelight, and more particularly to a reflector.

[0002]

2. Description of the Related Art Conventionally, as a vehicle lamp for irradiating light from a light source in a main irradiation direction and a direction different from the main irradiation direction, for example, a vehicle rear combination lamp disclosed in Japanese Utility Model Laid-Open No. 5-77803. The structure of is known.
The vehicle rear combination lamp disclosed in this publication will be described with reference to FIG. FIG. 7 shows that a single light source irradiates light to the vehicle rear direction for performing the function of the tail lamp as the main irradiation direction, and to the vehicle oblique front direction for performing the function of the side marker lamp as a direction different from the main irradiation direction. It is a vehicle horizontal direction sectional view of the rear combination lamp for vehicles. The arrow F direction in the drawing is the vehicle front direction, and the arrow R direction is the vehicle rear direction.

In FIG. 7, a lamp housing 70 is fixedly mounted on the vehicle body, and a reflector 72 is fixedly mounted in the lamp housing 70. The reflector 72 is provided with a reflecting portion 74 which is formed as a substantially paraboloid of revolution and is subjected to a reflection treatment, and a light source 71a, which is a filament of the bulb 71, is provided at a position of a focal point of the reflecting portion 74. It is arranged in the lamp housing 70. Also, the reflector
Reference numeral 72 is integrally formed with a lid-shaped cylindrical color cap portion 73 that is formed of a colored transparent member and covers the valve 71.

The color cap portion 73 has a Fresnel cut portion 73 having a Fresnel cut on the surface facing the outside of the vehicle.
a is provided. Then, the color cap portion 73
The reflector 72 formed integrally with is covered with an inner lens 75 and an outer lens 76 from the vehicle rear direction to the vehicle oblique front direction. The inner lens 75 is provided with a lens cut portion 75a having a lens cut on the surface on the light source 71a side from the vehicle rear direction to the vehicle oblique rear direction, and the outer lens 76 is provided with the lens cut portion 75a from the vehicle oblique front direction. A lens cut portion 76a having a lens cut on the surface on the light source 71a side is provided in the lateral direction.

The operation of the vehicle rear combination lamp having the configuration shown in FIG. 7 will be described. The light emitted from the light source 71 is colored and irradiated by the color cap 73 in all irradiation directions. The irradiation in the vehicle rearward direction, which is the main irradiation direction, will be described. The light that directly goes to the vehicle rearward direction and is incident on the lens cut portion 75a of the inner lens 75 is given a proper light distribution in the vehicle rearward direction by diffusion, and then is transmitted through the outer lens 76 to be irradiated. It In addition, the light traveling toward the reflection part 74 is generated by the reflection part 74.
By disposing the light source 71 at the focal point position, the light beam is reflected by the reflecting section 74 and is made into a parallel light beam in the rearward direction of the vehicle. The parallel light rays are emitted in the same manner as the light traveling directly in the rear direction of the vehicle.

Illumination in a vehicle oblique front direction, which is a direction different from the other main illumination direction, will be described. The Fresnel cut portion 73 of the color cap 73 does not face the reflection portion 74.
The light incident on a is transmitted through the inner lens 75, is incident on the lens cut portion 76a of the outer lens 76, is refracted by the lens cut portion 76a, and is irradiated in the vehicle oblique front direction.

[0007]

However, in the conventional vehicular lamp which irradiates the light from the light source in the main irradiation direction and the direction different from the main irradiation direction, the main irradiation direction is different from the main irradiation direction. To secure the amount of light,
It is a path of light that goes in a direction different from the main irradiation direction,
A sufficient distance (the distance W in FIG. 7) between the reflector and the lens is required. Therefore, there is a problem that the amount of light in the main irradiation direction is limited by limiting the reflection area outside the vehicle of the reflector.

Therefore, in order to solve the above problems, in the present invention, a physical predetermined condition is given to the light from the light source, and only the light from the light source satisfying the predetermined condition is selectively transmitted by the reflector. . That is, the object is to eliminate the need for providing a gap between the reflector and the lens, which is a path of light traveling in a direction different from the main irradiation direction, and to eliminate the restriction of the reflection area of the reflector.

[0009]

[Means for Solving the Problems] Claim 1 in the present invention
As a means corresponding to the above, in a vehicle lamp that emits light from a light source in a main irradiation direction and a direction different from the main irradiation direction, a transmitting unit that selectively transmits only light from a light source that satisfies a physical predetermined condition. Is provided in at least a part thereof. Further, as a means corresponding to claim 2 in the present invention, in the vehicle lamp according to claim 1, the physical predetermined condition is that an incident angle of light incident on the transmitting portion is less than a predetermined angle. It is characterized by

[0010]

By means of the means according to claim 1, the reflector itself selectively transmits only the light from the light source satisfying the physical predetermined condition with the transmitting portion, thereby going in a direction different from the main irradiation direction. It is not necessary to provide a gap between the reflector and the lens, which is the path of light. As a result, when light is emitted in the main irradiation direction and in a direction different from the main irradiation direction, it is possible to eliminate the restriction on the reflection area of the reflector outside the vehicle. Further, by the means corresponding to the above-mentioned claim 2, it becomes possible to easily give a physical predetermined condition.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention are directed to a vehicle rearward direction for performing a function of a tail lamp as a main irradiation direction by one light source,
A rear combination lamp for a vehicle that emits light from a light source in a diagonally forward direction of the vehicle to perform the function of a side marker lamp as a direction different from the main irradiation direction. A first embodiment will be described with reference to FIGS. FIG. 1 is a sectional view of a rear combination lamp for a vehicle according to a first embodiment in a vehicle horizontal direction. Further, the arrow F direction in the figure is the vehicle front direction,
The arrow R direction is the vehicle rear direction.

In FIG. 1, a light source 11a, which is a filament of a bulb 11, is arranged in a lamp housing 10 fixed to a vehicle body, and a so-called total reflection reflector 12 is fixed. The total reflection reflector 12 is a transparent substance, and light that enters at a critical angle or more is totally reflected at the boundary surface of the substance, and light that enters at a critical angle or less is transmitted. Formed of a reflective surface whose total reflection angle is the incident angle of the light emitted from the light source made of a resin or the like,
It is a reflector having transparency. Therefore, light that enters at a critical angle or more is totally reflected, and light that enters at a critical angle or less is transmitted.

The reflector 12 includes a flat surface portion 12c along the vehicle center side inside the lamp housing 10, a parabolic surface portion 12a outside the vehicle formed as a substantially paraboloid of revolution with the light source 11a as a focal point, and a vehicle center side. It is composed of a paraboloidal surface 12b. Further, the reflector 12 is formed of a colored transparent member, and is integrally formed with a capped cylindrical color cap portion 13 that covers the bulb 11. Further, on the surface of the color cap portion 13 on the light source 11a side in the vehicle rearward direction, a step 13a of a protrusion having a triangular cross section is provided in a protruding manner.
The step 13a is viewed from the rear of the vehicle (see arrow F in FIG. 1).
Direction) It has a multi-circular shape.

The parabolic surface portion 12a of the reflector 12 is provided with a transmitting portion 15 at a position substantially perpendicular to the vehicle oblique front direction. Further, on the flat surface portion 12c of the reflector 12, a guide portion 14 formed by step 14a of a protrusion having a triangular cross section is provided in a protruding manner. The step 14a is formed in a triangular prism shape along the plane portion 12c in the vehicle vertical direction.
FIG. 2 is an enlarged view of the vicinity of the guiding portion 14. Here, the step 14a is for guiding the light to the transmissive portion 15 by reflection, and is arranged on the flat surface portion 12c so that the light is incident on the transmissive portion 15 at a certain incident angle or less. It is set up. Further, the guiding portion 14 is provided at a portion that is not very effective for irradiation in the vehicle rearward direction, which is the main irradiation direction, that is, at the end portion of the flat surface portion 12c even if the light emitted from the light source 11a is reflected. To be And the reflector
12 is covered with an outer lens 16 from the vehicle rear direction to the vehicle diagonal front direction.

The operation of the first embodiment of the present invention will be described. The light emitted in the vehicle rearward direction, which is the main irradiation direction, will be described. The light that goes directly to the rear direction of the vehicle is diffused by the step 13a of the color cap portion 13 to improve the light distribution in the rear direction of the vehicle, and is transmitted through the outer lens 16 to be emitted. Further, since the light source 11a, which is the filament of the bulb, is disposed at the position of the focal point of the reflector 12, the parabolic surface portion 12a and the parabolic surface portion 12b.
The light directed in the direction is the parabolic surface portion 12a and the parabolic surface portion.
It is reflected by 12b and becomes a parallel light beam toward the rear of the vehicle. The parallel rays pass through the outer lens 16 and are emitted in the rearward direction of the vehicle.

Light emitted in a vehicle obliquely forward direction, which is a direction different from the other main irradiation direction, will be described. Even if the light is reflected by the flat surface portion 12c, it does not become a parallel light beam in the rearward direction of the vehicle, and light that is not very effective with respect to irradiation in the main irradiation direction enters the guiding portion 14 of the flat surface portion 12c. The guiding section
The light incident on 14 is reflected by the step 14a at an angle for incidence at an angle less than the incident angle on the transmission part 15. The certain incident angle is an angle less than a critical angle determined by the material of the transmissive portion 15 for transmitting light through the transmissive portion 15. Then, only the light reflected by the guiding portion 14, that is, the light incident on the transmitting portion 15 at an angle less than the incident angle, is transmitted through the transmitting portion 15, and the outer lens
It passes through 16 and is emitted diagonally forward of the vehicle.

Further, reflected light reflected by a portion other than the guiding portion 14 or direct light from the light source, which is incident on the transmitting portion 15, does not pass through the transmitting portion 15 and does not undergo total reflection. Then, the light passes through the outer lens 16 and is irradiated in the rearward direction of the vehicle.

By these actions, the guide section 14 gives an incident angle at the transmission section 15 which is a physical predetermined condition to light, and the reflector 12 itself selectively selects only light satisfying the predetermined condition. Will have the function of transmitting. As a result, it is not necessary to provide a space between the reflector 12 and the outer lens 16, which is a path for light traveling in a direction different from the main irradiation direction. It is possible to eliminate the restriction on the reflection area of the parabolic surface portion 12a and increase the light amount in the main irradiation direction.

Further, since the light is transmitted through the reflector 12, the lens cut of the outer lens 16 for irradiating the light obliquely forward of the vehicle by refraction is unnecessary. Therefore, it is not necessary to mount an inner lens in order to solve problems such as appearance due to the lens cut of the outer lens 16, and the cost is reduced and the productivity is improved.

A second embodiment of the present invention will be described with reference to FIGS. The description of the same configuration as the first embodiment is omitted. FIG. 3 is a horizontal cross-sectional view of a vehicle rear combination lamp according to the second embodiment. The arrow F direction in the drawing is the vehicle front direction, and the arrow R direction is the vehicle rear direction.
In FIG. 3, a total reflection reflector 30 includes a flat surface portion 30c along the vehicle center side in the lamp housing 10, a parabolic surface portion 30a on the vehicle side formed as a substantially paraboloid of revolution with the light source 11a as a focal point, and the vehicle. It is configured by a parabolic surface portion 30b on the center side.

The parabolic surface portion 30a of the reflector 30 has a transmissive portion 31 at a portion where light is distributed obliquely forward of the vehicle. FIG. 4 shows an enlarged view of the transmission part 31. A guide portion 32 is provided on the light source side surface of the transmissive portion 31, that is, on the reflector surface. The guide portion 32 is composed of a prism 32a, and the prism 32a has a triangular cross section.
It is a material with a different refractive index from 31. In addition, the prism 32
Reference character a is fixedly provided as a triangular prism-shaped band along the reflector surface of the reflector 30. Then, on the surface of the transmissive portion 31 on the vehicle oblique front side, that is, on the rear surface of the reflector, a lens cut portion 33 having a substantially right triangular shape whose cross-sectional shape is inclined toward the end of the reflector 30 is provided. ing.

The operation of the second embodiment of the present invention will be described. The irradiation in the vehicle rearward direction, which is the main irradiation direction, is the same as that in the first embodiment, and therefore will be omitted. Illumination in a vehicle oblique front direction, which is a direction different from the other main illumination direction, will be described. The light that has entered the guiding portion 32 is transmitted through the transmitting portion 31 by being refracted by a triangular prism that constitutes the guiding portion 32 and is made into light having a certain incident angle or less. Then, the lens cut portion on the rear surface of the reflector in the transmission portion 31.
Due to refraction at 33, the vehicle is illuminated diagonally forward.

By these actions, it is not necessary to provide a space between the reflector 30 and the outer lens 16,
By eliminating the restriction on the reflection area of the parabolic surface portion 30a, it is possible to increase the amount of light in the main irradiation direction,
As in the first embodiment, the inner lens need not be mounted.

Further, in the present embodiment, the guiding portion 32 for guiding the light to the transmitting portion 31 is formed by the triangular prism, but, for example, the interval between the triangular prisms is changed.
Alternatively, if the material of the transmissive portion 31 is changed into a striped shape or the like, the refractive index is different from that of the material of the transmissive portion 31, and the incident angle to the transmissive portion 31 is guided to be less than a certain incident angle,
The shape, configuration, etc. are not limited to this.

A third embodiment of the present invention will be described with reference to FIGS. The description of the same configuration as the first embodiment is omitted. FIG. 5 is a vehicle horizontal sectional view of a vehicle rear combination lamp in the third embodiment. The arrow F direction in the drawing is the vehicle front direction, and the arrow R direction is the vehicle rear direction. In FIG. 5, a total reflection reflector 51 is fixed in a lamp housing 50 fixed to the vehicle body. The reflector 51 includes a flat surface portion 51c on the outer side of the vehicle, which is substantially parallel to the rearward direction of the vehicle, a parabolic surface portion 51a on the outer side of the vehicle and a parabolic surface portion 51b on the center side of the vehicle, which are formed as substantially paraboloids of rotation centered on the light source 11a. It is composed of

A flat portion 51c of the reflector 51 outside the vehicle
Is a part for distributing light in the diagonally forward direction of the vehicle, and the transmitting part 52
have. FIG. 6 shows an enlarged view of the transmission part 52. A Fresnel cut portion 52a is provided on the surface on the light source side, that is, on the surface of the reflector, which has a Fresnel cut whose cross-sectional shape is a substantially right-angled triangle inclined toward the light source 11 side. Also,
A Fresnel cut portion 52b, which is subjected to the same Fresnel cut as the Fresnel cut portion 52a, is also provided on the surface of the reflector in the vehicle obliquely front direction from the vehicle outer side, that is, on the back surface of the reflector. Further, in the vehicle center side of the lamp housing 50, even if the light emitted from the light source 11a is reflected in the remaining portion other than that where the parabolic surface portion 51b on the vehicle body center side is fixed, the vehicle rear direction is the main illumination direction. The part that is not very effective for directional irradiation is the guide part 53. The guiding portion 53 is configured by a surface that has been subjected to a reflection process having a radius of curvature for allowing light to enter the transmitting portion 52 at a certain angle of incidence or less.

The operation of the third embodiment of the present invention will be described. The irradiation in the vehicle rearward direction, which is the main irradiation direction, is the same as that in the first embodiment, and therefore will be omitted. Illumination in a vehicle oblique front direction, which is a direction different from the other main illumination direction, will be described. The light incident on the guiding portion 53 is reflected toward the transmitting portion 52, passes through the transmitting portion 52, and is diffused by the Fresnel cut portions 52a and 52b, so that the light distribution in the vehicle oblique front direction is obtained. After being improved, the light is emitted in the diagonally forward direction of the vehicle. The light incident on the transmitting portion 52 at an incident angle or more is the same as that in the first embodiment, and therefore the description thereof will be omitted.

Due to these actions, it is not necessary to provide a space between the reflector 51 and the outer lens 16,
By eliminating the restriction of the reflection area of the parabolic surface portion 51a, it is possible to increase the amount of light in the main irradiation direction,
As in the first embodiment, the inner lens need not be mounted.

In the above first, second and third embodiments,
When the light is physically given a predetermined condition in the guiding part, the predetermined condition is set by the incident angle to the transmitting part, but the incident angle is not limited. Physical conditions other than the angle of incidence are, for example, the wavelength, and the guiding part in which the refractive index is changed in stripes by different materials is used to guide only the specific wavelength to the transmitting part, and only the light of the specific wavelength is transmitted in the transmitting part. , And is not limited to the incident angle.

Further, although the guiding portion is provided at a portion which is not so effective for the irradiation in the main irradiation direction even if the light emitted from the light source is reflected, the irradiation in the main irradiation direction secures a sufficient light amount. If possible, it is also possible to guide light that is effective for irradiation in the main irradiation direction. The shape is not limited to these as long as it can be guided to the transmission part. Furthermore, although the vehicle rear combination lamp that emits light in two directions by one light source has been illustrated, the number of light sources, the number of directions, and applications are not limited to these.

[0031]

According to the present invention, the light from the light source is provided with a physical predetermined condition, and the reflector itself selectively transmits only the light from the light source satisfying the physical predetermined condition. , It becomes possible to increase the amount of light in the main irradiation direction by eliminating the restriction on the reflection area of the reflector outside the vehicle. Further, by setting the physical predetermined condition as the incident angle of the light incident on the transmission part, the predetermined condition can be easily set.

[Brief description of drawings]

FIG. 1 is a vehicle horizontal cross-sectional view of a vehicular lamp showing a first embodiment of the present invention.

FIG. 2 is an enlarged view of the vicinity of the guiding portion according to the first embodiment of the present invention.

FIG. 3 is a vehicle horizontal sectional view of a vehicle lamp showing a second embodiment of the present invention.

FIG. 4 is an enlarged view of the vicinity of the guiding part and the transmitting part of the second embodiment of the present invention.

FIG. 5 is a vehicle horizontal sectional view of a vehicular lamp showing a third embodiment of the present invention.

FIG. 6 is an enlarged view of the vicinity of a transmission part according to a third embodiment of the present invention.

FIG. 7 is a sectional view of a conventional vehicle lamp in the vehicle horizontal direction.

[Explanation of symbols]

 10,50 ・ ・ ・ Lamp housing 11 ・ ・ ・ Light source 12,30,51 ・ ・ ・ Reflector 13 ・ ・ ・ Lens cap 14,32,53 ・ ・ ・ Guide 15,15,52 ・ ・ ・ Transparent 16 ... Outer lens 33, 52a, 52b ... Lens cut

Claims (2)

[Claims] 1. A vehicular lamp that irradiates light from a light source in a main irradiation direction and a direction different from the main irradiation direction, and a transmission part that selectively transmits only light from a light source that satisfies a physical predetermined condition. A vehicle lamp comprising a reflector having at least a part thereof. 2. The vehicular lamp according to claim 1, wherein the physical predetermined condition is that an incident angle of light incident on the transmitting portion is less than a predetermined angle.