JPH0448562Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to an illumination lamp used, for example, as a headlight of an automobile.

[Conventional technology]

As conventional illumination lights, for example, Fig. 6 and Fig. 7
There is something like the one shown in the figure (see Japanese Patent Application No. 59-220480). This lighting lamp includes a light emitting bulb 101,
A reflector 105 having a paraboloid 103 that reflects the light emitted from the bulb 101 forward, an outer lens 107 that refracts the reflected light from the reflector 105, and an inner lens 109 provided between the bulb 101 and the outer lens 107. It mainly consists of

The inner lens 109 has a tapered trapezoidal shape made of a transparent material that can transmit the light reflected by the reflector 105, and can be placed in an upright state (see FIG. 6) and a collapsed state (see FIG. 7) by the actuator 111. It is possible to move to. Then, the inner lens 109 in the use state is the reflector 1
The reflected light of 05 is received by the front refraction surface, is incident, is refracted into downward light, and is emitted forward. This results in
Although the structure does not give glare to an oncoming vehicle when passing by an oncoming vehicle, a sufficient amount of downward light can be ensured since no light shielding shade is provided below the bulb 101.

On the other hand, when the inner lens 109 is in the collapsed state, the reflected light from the reflector 105 does not enter the front refraction surface of the inner lens 109, but directly enters the outer lens 107, and normal upward light is obtained as a traveling beam.

[Problem that the invention attempts to solve]

By the way, in such a conventional lighting lamp, since the inner lens 109 is a transparent body, when the trapezoidal inner lens 109 is in a collapsed state, when viewed from the plane of FIG. The light entering from the lower bottom part 109a of the side part 109b
Alternatively, the light becomes scattered when it exits from the upper base portion 109c.
Also, when viewed from the side in FIG. 9, the inner lens 109
It is totally reflected on the refractive surface of the light and becomes scattered light. In such a case, there is a risk that the main optical axis of the traveling beam will vary and that the aiming error of the vehicle inspection tester will be more likely to occur.
It is necessary to create a complex light distribution design that also takes into consideration the scattered light emitted from the light source 9.

On the other hand, if the structure is such that the inner lens 109 attachment part of the reflector 105 is lowered one step and the inner lens 109 itself is stored in the lower part of the reflector 105 with the inner lens 109 laid down, the reflector 109 is attached to the circumferential surface of the inner lens 109. Since reflected light from the outside does not enter, it is possible to suppress the occurrence of scattered light. However, with the above structure, the shape of the reflector 105 becomes complicated, making it difficult to process, and the entire illuminating lamp becomes large, which is extremely disadvantageous to the recent trend toward thinning.

This invention was made with attention to the above problem, and the purpose is to provide an illumination lamp that has a simple structure and can suppress the scattering of light from the inner lens.

[Means for solving problems]

In order to achieve the above object, this invention provides an illumination lamp comprising a light emitting bulb, a reflector that reflects the light emitted from the bulb forward, and an outer lens that refracts the reflected light from the reflector. an inner lens that is interposed between the lens and can be moved between an upright state and a laid down state to change the reflected light from the reflector downward;
An actuator for moving the inner lens is provided, and a plurality of cut surfaces for diffusing light are provided on the circumferential surface of the inner lens.

[Effect]

In the above configuration, when the inner lens is in an upright state, the reflected light from the reflector enters the front of the inner lens, is refracted, and exits forward. on the other hand,
When the inner lens is in the collapsed state, even if part of the reflected light from the reflector enters from one side of the circumferential surface of the inner lens, it is diffused by the cut surface and scattering of light from the other side is suppressed.

〔Example〕

Embodiments of this invention will be described in detail below based on the drawings.

1 to 5 show a lighting lamp according to an embodiment of this invention. Here, Fig. 1 is an exploded perspective view, Fig. 2 is a side sectional view when the inner lens is in an upright state, Fig. 3 is a side sectional view when the inner lens is in a collapsed state, and Figs. 4 and 5. is an action explanatory diagram.

1 to 3, the illumination lamp includes a light emitting bulb 1, a reflector 5 having a paraboloid 3 that reflects the light emitted from the bulb 1 forward, and an outer lens that refracts the reflected light of the reflector 5. 7
and an inner lens 9 provided between the bulb 1 and the outer lens 7.

The bulb 1 has a single filament 11 . The bulb 1 is attached to the rear end of the reflector 5 so that the filament 11 is located near the focal point of the paraboloid 3.

The outer lens 7 is formed into a prism that can obtain various light distribution characteristics, and is fixed to the front edge of the reflector 5 with an adhesive or the like.

The inner lens 9 is made of a transparent body that can transmit the reflected light from the reflector 5, and is disposed between the bulb 1 and the outer lens 7. The inner lens 9 is formed into a trapezoidal flat plate shape, and has a lens cut 12 for refraction on one side and a lens cut 14 for diffusion on the other side. The lens cut 12 for refraction is configured to refract, for example, upward light into downward light. Upper base 1 as peripheral surface
3 and the left and right sides 15 are provided with a plurality of semi-cylindrical fine optical elements 2 as cut surfaces for diffusing light.
2 are integrally formed. This optical element 22
, the flat side of the semicircular cylinder is the upper base 1 of the inner lens 9.
3 and the entire left and right side portions 15, when the curved surface portion is in the state where the inner lens 9 is in a collapsed state, the outer lens 7
It is designed to be applied on the side. That is, the configuration is such that light entering from the flat surface of the semi-cylindrical optical element 22 is diffused and emitted from the curved surface side. On the other hand, the optical element 22 is not provided on the lower bottom portion 17 of the inner lens 9 as the peripheral surface.

Lower bottom portion 17 of left and right side portions 15 of inner lens 9
A support shaft 19 is formed on each side.
This support shaft 19 is rotatably supported by a cylindrical bearing 23 provided at the bottom 21 of the reflector 5 and a bearing 25 having a slit at the upper end. And the locking part 27 between the inner lens 9 and the reflector 5
A spring 29 is resiliently installed between the inner lens 9 and the inner lens 9 to bias it toward the collapsed side. Thereby, the inner lens 9 is configured to be movable between an upright state and a laid down state. That is, when the inner lens 9 is in the upright state, the front refractive lens cut faces the lower half of the paraboloid 3, and in the collapsed state, the lower bottom 17 as the circumferential surface faces the reflector 5. It will face the lower end of the paraboloid 3.

A shape memory alloy member 31 is attached between the lower bottom 17 of the inner lens 9 and the bottom 21 of the reflector 5. This shape memory alloy member 31 is connected to a power source (not shown) such as a battery via a switch (not shown) provided in the vehicle interior, for example. When the shape memory alloy member 31 receives electric current and becomes high temperature, it maintains the L-shaped shape as shown in FIG. The inner lens is caused to fall down as shown in FIG. 3 by the force of the spring 29. The spring 29 and the shape memory alloy member 31 constitute an actuator that moves the inner lens 9.

Next, the action will be explained.

In the above configuration, if you want to turn on bulb 1 to obtain downward light, turn on the switch inside the vehicle,
The inner lens 9 is placed in an upright state. As a result, the light emitted from the bulb 1 is reflected by the paraboloid 3 of the reflector 5, and the reflected light from the upper part of the paraboloid 3 is directly transmitted to the outer lens 7, and the reflected light from the lower part of the paraboloid 3 is refracted downward by the inner lens 9. and proceed to outer lens 7. This creates a structure that does not give glare to oncoming vehicles when passing by them. Moreover, since the entire paraboloid 3 is effectively utilized, a sufficient amount of downward light can be obtained.

On the other hand, if it is desired to obtain upward light as a normal running beam, the vehicle interior switch is turned off and the inner lens 9 is placed in a reclined state. As a result, the light reflected by the paraboloid 3 of the reflector 5 directly advances to the outer lens 7. At this time, a part of the reflected light from the reflector 5 enters the inner lens 9 from the lower base 17 and travels toward the upper base 13 and the left and right sides 15. Since the optical element 22 is provided on the side portion 15, the light is diffused and emitted from the upper portion 13 and the left and right side portions 15, and becomes substantially ineffective light that does not need to be considered as scattered light.

Therefore, the light distribution of the traveling beam can be designed using only the outer lens 7 without considering the scattered light from the inner lens 9. In addition, although the molding process of the optical element 22 increases, the conventional structure can be applied as is, and only the inner lens 9 needs to be processed. Therefore, the number of man-hours does not increase significantly and the scattering light from the inner lens 9 is reduced with a simple structure. The occurrence can be suppressed.

Note that this invention is not limited to the above embodiment; for example, a semi-cylindrical cut surface may be integrally molded, or the cut surface may be formed with fine irregularities to diffuse the reflected light from the reflector 5. You can also get the same effect.

Further, the cut surface may be provided not in the entirety of the upper base 13 and the left and right sides 15 of the inner lens 9, but in a part thereof, or the cut surface may be formed on the lower base 17.

Furthermore, it goes without saying that the same effect can be obtained by adhering, for example, a plate-like member to the cut surface.

[Effect of idea]

As explained above, according to this invention, in order to diffuse the reflected light of the reflector that enters from one side of the circumferential surface of the inner lens in the collapsed state and suppress it from being emitted from the other side as scattered light, the traveling beam is Light distribution design can be performed using only the outer lens without considering scattered light from the inner lens. In addition, the conventional structure can be applied as is by simply adding an inner lens processing step, and scattering of light from the inner lens can be suppressed with a simple structure.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of a lighting lamp according to an embodiment of the invention, Figs. 2 and 3 are side sectional views showing the operating state, Figs. 4 and 5 are explanatory views of the operation,
6 and 7 are side sectional views of the conventional example, and FIGS. 8 and 9 are action explanatory diagrams of the conventional example. 1... Bulb, 5... Reflector, 7... Outer lens, 9... Inner lens, {13... Upper bottom, 15... Left and right sides, 17... Lower bottom} (periphery), 22... Optical element (cut surface), {29...
Spring, 31...shape memory alloy member} (actuator).

Claims (1)

[Scope of utility model registration request] In an illumination lamp consisting of a light emitting bulb, a reflector that reflects the light emitted from the bulb forward, and an outer lens that refracts the light reflected from the reflector, the lamp is interposed between the reflector and the outer lens and directs the light reflected from the reflector downward. It is characterized by comprising an inner lens that can be moved between an upright state and a collapsed state, and an actuator that moves this inner lens, and a plurality of cut surfaces for diffusing light are provided on the circumferential surface of the inner lens. A lighting lamp.