JPH10297354A - Lighting fixture for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To regulate the color and the variation of density of a radiating light, to simplify the structure, and to make a lighting fixture main body in a small size. SOLUTION: By tilting a filter member 6 to the optical axis Z-Z by an actuator 7, the incident angle of a reflected parallel light injecting to a dichroic filter is changed so as to change the membranous thickness of the dichroic filter to permeate the reflected parallel light, and the density of the yellow color of the permeating radiation light is changed. As a result, when the yellow color of the radiation light is made thick, the scattering damping by the water drops of the mist is reduced comparing with the white light, and when the yellow color of the radiation light is made thin, the permeability of the visible radiation is improved compared with the case using a coloring means. The structure of this system is simpler compared with a variable mechanism to cover or remove a bulb cap to the light source bulb. And the housing space is unnecessary compared with a colored lens to be house by removing from the optical path of the reflected light, so as to make the lighting fixture main body in a small size.

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 headlamp or a fog lamp, and more particularly to a vehicular lamp capable of changing the color or shading of irradiation light.

[0002]

2. Description of the Related Art A vehicle lamp of this type generally includes a light source bulb, a reflector for reflecting light from the light source bulb, and a lens for irradiating the reflected light from the reflector to the front. When the light source bulb is turned on, light from the light source bulb is reflected by the reflector, and the reflected light is radiated forward from the reflector via a lens in a predetermined light distribution pattern. In such a vehicle lamp, when the irradiation light is white light, when the irradiation light is colored light using a coloring means, and when the coloring means is configured to be movable, the irradiation light becomes white light and colored light. There are cases where it can be switched. In addition,
As the above-described light coloring means, a case where a colored valve cap for covering the light source bulb is used and a case where a colored lens (or a colored filter) is used (the colored lens is set on the back side or the front side of a normal colorless and transparent lens) ).

[0003]

However, in the above-described conventional vehicle lamp, when the irradiation light is white light, when the vehicle is driven at night in a foggy environment, the white light is scattered by water droplets of the mist in the atmosphere. As a result, irradiation light is attenuated, and visibility is reduced. In addition, when the irradiation light is yellow light, the attenuation due to scattering is smaller in the fog than in the white light. Poor transmittance. Further, when the irradiation light is switched between white light and colored light, a movable mechanism having a complicated structure for covering or removing the colored bulb cap from the light source bulb is required, and the colored lens is moved out of the optical path of the reflected light. In this case, a space for accommodating the colored lens is required, and the size of the lamp body becomes large. In addition, if a colored bulb cap or a colored lens coloring means is used, the density of the irradiation light of a specific color can be changed (adjusted). Cannot be done.

An object of the present invention is to provide a vehicular lamp capable of changing the color and shading of irradiation light, having a simple structure, and capable of reducing the size of the lamp body.

[0005]

According to the present invention, there is provided a dichroic filter for transmitting only light in a specific wavelength region, and a filter member mounted to be tiltable with respect to an optical axis, and the filter member is tilted. And a driving means.

As a result, in the vehicle lamp of the present invention, when the filter member is tilted with respect to the optical axis by the driving of the driving means, the incident angle of the reflected light incident on the dichroic filter of the filter member changes to reflect the reflected light. The film thickness of the dichroic filter through which light passes changes, the specific wavelength region through which light passes changes, and the color and shade of the transmitted light change.

As described above, the vehicular lamp of the present invention can change the shading of the color of the illuminating light. Therefore, if the illuminating light, for example, the yellow color, is deepened, the scattering attenuation due to the water droplets of the mist becomes white light. If the color of the irradiation light, for example, the color of yellow is lightened, the visible light transmittance is improved as compared with the case where the coloring means is used. Furthermore, since it is composed of driving means for tilting a filter member which is tiltably attached to the optical axis, its structure is smaller than that of a movable mechanism for covering or removing a light source bulb with a bulb cap of a specific color. Easy. Further, by inclining the filter member having the dichroic filter with respect to the optical axis, the color and the shading of the irradiation light are changed.
Compared with a lens colored in a specific color that is stored outside the optical path of the reflected light, the storage space is not required, and the lamp body can be reduced in size accordingly.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a vehicular lamp according to an embodiment of the present invention. This example describes a fog lamp that can obtain yellow irradiation light and change the shade of yellow of the irradiation light.

In FIG. 1, reference numeral 1 denotes a light source bulb. The light source bulb 1 is detachably attached to a reflector 2 described later via a socket or the like. At this time, a light emitting unit (not shown) such as a filament of the light source bulb 1 is located near a focal point FP of the reflector 2 described later.

In FIG. 1, reference numeral 2 denotes a reflector made of metal or resin. On the paraboloid of revolution inside the reflector 2, there is provided a reflection surface 20 which has been subjected to light reflection processing such as aluminum evaporation. This reflector 2 has a focal point FP on the optical axis ZZ (the rotation axis of the paraboloid of revolution of the reflection surface 20 of the reflector 2). As a result, in the reflector 2, the light L1 from the light source bulb 1 whose light emitting unit is located near the focal point FP is reflected forward and parallel.

In FIG. 1, reference numeral 3 denotes a colorless and transparent lens. The lens 3 irradiates yellow colored light, which is reflected parallel light L2 from the reflector 2 and transmitted through a filter member 6 described later, in a predetermined light distribution pattern to the front. The lens 3 has a refraction-diffusion type prism element group (not shown) for forming a light distribution pattern.
The lens 3 and the reflector 2 described above are fixedly held on a frame 4. The frame 4 is provided with a pair of mounting arms 40 integrally.

In FIG. 1, reference numeral 6 denotes a filter member.
As shown in FIGS. 4 to 6, the filter member 6 has a disk-shaped glass substrate 60 and a light in a specific wavelength region on the surface of the glass substrate 60 on the lens 3 side, in this example, only yellow light. Dichroic thin film that transmits light
0 and a dichroic filter 61 (shaded portions in FIGS. 4 and 5) processed concentrically. This filter member 6 is excellent in heat resistance.

The above-mentioned dichroic filter 61 is made of a thin film having a high refractive index and a predetermined thickness (for example, TiO ₂ ) and a thin film having a low refractive index and a predetermined thickness (for example, SiO ₂ ) by vacuum deposition or sputtering. Alternately, for example, 13 to 3
It is made up of five layers, and transmits only light in a specific wavelength region of visible light by utilizing the above-described light interference of the thin film. The light having a complementary color with the light in the above-mentioned specific wavelength region is supplied to the dichroic filter 6 described above.
1 is surface-reflected at the surface. The dichroic filter 61 of this example has a maximum spectral reflection of 440 in 15 layers.
(Nm). That is, the dichroic filter 61 of this example transmits yellow light and reflects blue light. In FIG. 6, the thickness of the dichroic filter 61 is shown to be thicker than the thickness of the glass substrate 60.

A filter holder 63 is fixed around the filter member 6 described above. This filter holder 63
Has a magnifying glass shape, a shaft portion 64 is integrally provided on the left and right sides of the outer peripheral surface of the filter holder 63 on the horizontal axis HH, and a sphere is provided on a vertical axis on a lower back surface of the filter holder 63. The recess 65 is provided integrally. The shaft portion 64 of the filter member 6 is attached to the mounting arm 40 of the frame 4.
Is mounted to be tiltable about a horizontal axis HH orthogonal to the optical axis ZZ.

In FIG. 1, reference numeral 7 denotes an actuator as a driving means for tilting the filter member 6. This actuator 7 is attached to the frame 4. The actuator 7 has a built-in motor (not shown), an advancing / retracting rod 70 which advances / retreats via a power transmission means such as a transmission gear by driving the motor, and an integral end of the advancing / retreating rod 70. (Pivot part) 71 provided in the camera. The spherical portion 71 is fitted in the spherical concave portion 65 of the filter member 6. The spherical portion 71 and the spherical concave portion 65 absorb a gap between the linearly reciprocating motion of the reciprocating rod 70 and the tilting motion of the filter member 6 in the arc direction.

In FIG. 7, SW1 is a light switch for turning on and off the light source bulb 1, and SW2 is an operation switch for performing a switching operation of yellow light and shade of irradiation light.
In FIG. 7, reference numerals 8 and 80 denote a control circuit and a position sensor as control means. The above-described position sensor 80 is for detecting the stop position of the filter member 6, and is constituted by, for example, a potentiometer or a photocoupler. On the other hand, the control circuit 8 includes the light source bulb 1, the motor of the actuator 7, the light switch SW
1, an operation switch SW2, a position sensor 80, and a power supply (battery) 81 are electrically and mechanically connected to each other. The operation of the operation switch SW2 drives the motor of the actuator 7, and the filter is moved through the advance / retreat rod 70. When the member 6 is tilted about the shaft portion 64 and located at the stop position, the motor of the actuator 7 is stopped by the operation of the position sensor 80.

The light source bulb 1, the reflector 2, the lens 3, the filter member 6, the actuator 7, the position sensor 80, and the like are integrally assembled by the above-described frame 4, and these assembled bodies are used as an outer cover or an outer lens. (Not shown) and housed in a lamp chamber (not shown) defined by a lamp casing or a lamp housing (not shown) to constitute a fog lamp.
Further, the reflector 2 is formed integrally with the lamp housing, and the light source bulb 1, the lens 3, the filter member 6, the actuator 7, the position sensor 80, and the like are assembled to the lamp housing integrated with the reflector to form a fog lamp. .

The vehicular lamp according to the present invention in this embodiment has the above-described configuration, and its operation will be described below. First, as shown in FIGS. 1 and 2, when the light source bulb 1 is turned on or turned on by operating the light switch SW1 when the filter member 6 is in a state perpendicular to the optical axis Z-Z, As shown in FIG. 2, the light L1 from the light source bulb 1 is reflected in parallel by the reflecting surface 20 of the reflector 2, and the reflected parallel light L2 is reflected on the optical axis Z-.
The light passes through the glass substrate 60 and the dichroic filter 61 of the filter member 6 which is perpendicular to Z, and is radiated as yellow irradiation light through the lens 3 to the outside front in a predetermined light distribution pattern.

Next, when the operation switch SW2 is operated when the filter member 6 is in the vertical state with respect to the optical axis ZZ as shown in FIGS. 1 and 2, the motor of the actuator 7 is driven, and Filter member 6 via rod 70
Is tilted about the shaft portion 64, and when the filter member 6 is located at the stop position shown in FIG. 3, the motor of the actuator 7 is stopped by the operation of the position sensor 80, and the filter member 6 is moved as shown in FIG. It will be located in a state inclined with respect to the optical axis Z-Z. Here, the light switch S
When the light source bulb 1 is turned on or turned on by the operation of W1, light L1 from the light source bulb 1 is reflected in parallel by the reflecting surface of the reflector 2, and the reflected parallel light L2 is reflected by the glass substrate 60 of the filter member 6, After passing through the dichroic filter 61, the light is emitted to the outside front through the lens 3 in a predetermined light distribution pattern as yellow irradiation light.

Further, when the operation switch SW2 is operated in a state where the filter member 6 is inclined with respect to the optical axis ZZ as shown in FIG. 3, the motor of the actuator 7 is driven, and the advance / retreat rod 70 is moved. When the filter member 6 is tilted about the shaft portion 64 through the center and the filter member 6 is located at the stop position shown in FIGS.
By the action of 0, the motor of the actuator 7 is stopped, and the filter member 6 is positioned perpendicular to the optical axis Z-Z as shown in FIGS.

As described above, when the filter member 6 has the optical axis ZZ
, The incident angle of the reflected parallel light L2 incident on the dichroic filter 61 of the filter member 6 changes, so that the film thickness of the dichroic filter 61 through which the reflected parallel light L2 passes changes and passes. The specific wavelength region changes and the shade of yellow of the transmitted light (irradiation light) changes.

Here, the dichroic filter 61 of the above-mentioned filter member 6 (maximum spectral reflection is 440 in 15 layers).
FIG. 8 shows the spectral transmittance characteristics when the incident angle of the reflected parallel light L2 incident on the dichroic filter 61 of the filter member 6 is changed in the yellow dichroic filter set to (nm). As shown in FIG. 8, the incident angles are 0 °, 10 °, 20 °, 30 °.
When the angle is changed to 40 °, 40 °, or 46 °, the characteristic of the spectral transmittance shifts in the short wavelength direction as the incident angle increases. That is, when the incident angle is 0 °, the transmitted light is dark yellow, and changes to light yellow transmitted light as the incident angle increases. In FIG. 8, curve A shows the case where the incident angle is 0 °, curve B shows the case where the incident angle is 10 °, curve C shows the case where the incident angle is 20 °, and curve D shows the case where the incident angle is 20 °. The case where the angle is 30 ° is shown, the curve E shows the case where the incident angle is 40 °, and the curve F shows the case where the incident angle is 46 °.

In the explanatory diagram of FIG. 9, the incident angle of light (reflected parallel light L2) and the chromaticity (x, y, z), luminous transmittance (Y%), and average transmittance (%) are shown. The relationship is shown in FIG.
The chromaticity diagram shows the range of yellow light according to JIS,
In the enlarged view of the chromaticity diagram of FIG.
The relationship between the incident angle 2) and the range of yellow light according to JIS is shown. As shown in FIGS. 9, 10, and 11, when the incident angle of light (reflected parallel light L2) is 0 ° to 46 °, J
It is in the yellow light range of the IS standard. In FIG. 10, Y indicates the range of yellow light according to JIS, and G indicates JIS.
W indicates the range of standard green light, and W indicates the range of white light according to JIS. In FIG. 11, a point a indicates a case where the incident angle of light (reflected parallel light L2) is 0 °, a point b indicates a case where the incident angle of light (reflected parallel light L2) is 10 °,
Point c shows the case where the incident angle of light (reflected parallel light L2) is 20 °, and point d shows that the incident angle of light (reflected parallel light L2) is 30 °.
°, a point e indicates a case where the incident angle of light (reflected parallel light L2) is 40 °, and a point f indicates light (reflected parallel light L2).
Shows the case where the incident angle of the light (reflected parallel light L2) is 50 °.

As described above, the vehicular lamp of the present invention according to this embodiment includes the filter member 6 by the actuator 7.
Is tilted with respect to the optical axis ZZ, the incident angle of the reflected parallel L2 light incident on the dichroic filter 61 of the filter member 6 changes, and the thickness of the dichroic filter 61 through which the reflected parallel light L2 passes is reduced. The intensity of the transmitted light (irradiation light) changes. As a result, if the irradiation light is made deeper in yellow, scattering attenuation due to water droplets of fog is reduced as compared with white light, and if the irradiation light is made lighter in yellow, the transmittance of visible light is increased by using a coloring means. Better than what you have. Further, since the actuator 7 tilts the filter member 6 attached to be tiltable with respect to the optical axis Z-Z, it is compared with a movable mechanism for covering or removing a light source bulb with a bulb cap of a specific color. And its structure is simple. Further, the filter member 6 having the dichroic filter 61 is moved along the optical axis Z-.
By tilting with respect to Z, the intensity of yellow of the irradiation light is changed, so that the storage space is unnecessary compared to a lens colored in a specific color that is stored outside the optical path of the reflected light. Therefore, the size of the lamp body can be reduced accordingly.

Furthermore, in this embodiment, the filter member 6 can be automatically tilted to a predetermined angle by the control circuit 8 and the position sensor 80, and the filter member can be steplessly set within a set angle range. It can also be tilted.

In the above embodiment, the fog lamp for irradiating yellow irradiation light has been described. However, the vehicular lamp of the present invention can be applied to a headlamp and other lamps. Further, in the above-described embodiment, the yellow irradiation light has been described, but the vehicle lamp of the present invention can be applied to irradiation lights of other colors.

Furthermore, in the above-described embodiment, the shade of the irradiation light is changed (adjusted), but the vehicular lamp of the present invention can also change the color of the irradiation light.

[0028]

As is apparent from the above description, the vehicular lamp according to the present invention can change the shading of the illuminating light. If the attenuation is smaller than that of white light, and the color of the irradiation light, for example, yellow, is made lighter, the transmittance of visible light becomes better as compared with that using the coloring means. further,
Since it is composed of driving means for tilting the filter member which is mounted to be tiltable with respect to the optical axis, its structure is simpler than that of a movable mechanism for covering or removing a light source bulb with a bulb cap of a specific color. is there. In addition, since the color or shading of irradiation light is changed by tilting a filter member having a dichroic filter with respect to the optical axis, a lens colored in a specific color that is stored outside the optical path of reflected light. The storage space is not required as compared with that of the first embodiment, and the size of the lamp body can be reduced accordingly.

[Brief description of the drawings]

FIG. 1 is a side view of a main part showing an embodiment of a vehicular lamp of the present invention.

FIG. 2 is an explanatory diagram showing an optical path when a filter member is in a state perpendicular to an optical axis ZZ.

FIG. 3 is an explanatory diagram showing an optical path when a filter member is in a state of being tilted with respect to an optical axis ZZ.

FIG. 4 is a view taken in the direction of the arrow IV in FIG.

FIG. 5 is a front view of a filter member.

FIG. 6 is a sectional view taken along line VI-VI in FIG. 5;

FIG. 7 is an electric circuit diagram of a light source bulb, an actuator, a control circuit, a position sensor, a power supply, a light switch, and an operation switch.

FIG. 8 is an illustration showing spectral transmittance characteristics of a yellow dichroic filter in which the maximum spectral reflection is set to 440 (nm) in 15 layers and the incident angle of light incident on the dichroic filter is changed. FIG.

FIG. 9 is an explanatory diagram showing a relationship between an incident angle and chromaticity, luminous transmittance, and average transmittance.

FIG. 10 is a chromaticity diagram showing a range of yellow light according to JIS.

FIG. 11 is an enlarged chromaticity diagram showing the relationship between the incident angle of light and the range of yellow light according to JIS.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Light source bulb, 2 ... Reflector, 3 ... Lens, 4 ... Frame, 6 ... Filter member, 60 ... Glass substrate, 61 ...
Dichroic filter, 63 ... Filter holder, 64
... Shaft portion, 65 spherical recess, 7 actuator, 70 retractable rod, 71 spherical portion, 8 control circuit, 80 position sensor, 81 power supply, SW1 light switch, SW2 operation switch, L1 light source Light from the bulb, L2 ... reflected parallel light.

Claims (1)

[Claims] 1. A light source bulb, a reflector that reflects light from the light source bulb, a lens that irradiates the reflected light from the reflector forward, and a dichroic filter that transmits only light in a specific wavelength region. A filter member tiltably attached to the optical axis; and a drive unit for tilting the filter member. When the filter member is tilted with respect to the optical axis by the drive unit, the dichroic filter includes: The incident angle of the reflected light changes, the film thickness of the dichroic filter through which the reflected light transmits changes, the specific wavelength region to transmit changes, and the color and density of the transmitted light change. Characteristic vehicle lighting.