JPH028403B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to an illumination lamp used as a headlight of an automobile.

(b) Technical background and problems In general, lighting lights for automobiles, etc. have long-distance illumination that allows you to see obstacles 100 meters or more in front of you at night, and do not cause glare to oncoming vehicles when you pass them. It is essential that the structure has the ability to attenuate light or convert upward light into downward light.

By the way, as a conventional lighting lamp of this kind, there is one shown in Figure 11 (October 15, 1981).
(See page 79 of Automotive Engineering Complete Book 10 "Electrical Components, Vehicle Body Equipment, Engine Parts" published by Nissankaido). This illumination lamp includes a light emitting bulb 101, a reflector 105 having a paraboloid 103 that reflects the light emitted from the bulb 101 forward, and
and a lens 107 that refracts the reflected light of No. 5. The bulb 101 includes a main beam filament 109, as shown in FIG.
A shade 113 is provided below the sub-beam filament 111 to block downward light from the sub-beam filament 111.

When the main beam filament 109 is turned on, the light distribution as upward light (the fifth
(Fig. 4) is obtained, and when the sub-beam filament 111 is turned on, a downward light distribution (Fig. 4) is obtained.

However, in such a conventional lighting lamp, in order to prevent the downward light beam from the sub-beam filament 109 from being reflected by the lower side of the paraboloid 103 of the reflector 105 and turning into an upward light beam, , the sub-beam filament 11
It had a structure in which a shade 113 was provided below 1. Therefore, the paraboloid 103 on the lower side of the reflector 105 is shaped like the main beam filament 1.
There was a problem that the light beam from the sub-beam filament 111 was not used effectively because the lower side of the reflector 105 was wasted because it was used only when the sub-beam filament 111 was lit. For this reason, if the light is directed downward during rainy weather, a sufficient amount of light may not be obtained, and visibility may be significantly reduced.

(c) Purpose of the invention This invention was devised by focusing on the problems of the conventional art, and its purpose is to provide a lighting lamp that can provide a sufficient amount of light even when the lighting is changed to downward lighting. .

(d) Structure of the Invention In order to achieve the above object, the present invention provides an illuminating lamp comprising a light emitting bulb, a reflector that reflects the light emitted from the bulb forward, and a lens that refracts the reflected light from the reflector. The present invention is configured to include an auxiliary lens interposed between the bulb and the reflector and movable between a used state in which upward light is changed into downward light and an inactive state in which it is laid down, and an actuator for moving this auxiliary lens.

(e) Examples The present invention will be explained below based on the drawings.

1 to 3 show a lighting lamp according to an embodiment of the present invention, and FIG. 1 is an exploded perspective view, and FIG. 2 is an exploded perspective view.
The figure is a side sectional view showing a downward light state, and FIG. 3 is a side sectional view showing an upward light state.

First, to explain the configuration, 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 a lens 7 that refracts the reflected light of the reflector 5. It is composed of an auxiliary lens 9 that refracts the light reflected by the reflector 5 into downward light.

The bulb 1 has a single filament 11, and the filament 11 is positioned near the focal point of the paraboloid 3 of the reflector 5 and slightly forward.
It is attached to the rear end of the reflector 5.

The lens 7 has a boundary line L as shown in FIG.
The upper part 13 is formed by itself as a prism that can obtain the light distribution as shown in FIG. 4, and the lower part 15 of the boundary line L is formed of a transparent prism and a left and right diffusion prism. This lens 7 is fixed to the front edge of the reflector 5 with adhesive or the like.

The auxiliary lens 9 is disposed between the bulb 1 and the lens 7. The auxiliary lens 9 is rotatably supported by a cylindrical bearing 19a of the reflector 5 and a bearing 19b having a slit at the upper end via a pair of left and right support shafts 17 provided at the lower end. and the locking part 5a of the reflector 5
It is urged in the direction of collapse shown in FIG. 3 by a spring 21 attached between the two. Therefore, the auxiliary lens 9 is configured to be movable between a used state in which it is interposed between the bulb 1 and the lens 7 and a non-used state in which it is laid down. A shape memory alloy member 23 is attached to the lower end of the auxiliary lens 9, and the shape memory alloy member 23 is connected to a power source such as a battery (not shown) via a switch (not shown) provided in the vehicle interior. ). The spring 21 and the shape memory alloy member 23 constitute an actuator that moves the auxiliary lens 9. The shape memory alloy member 23 maintains an L-shaped shape as shown in FIG. 2 when heated to a high temperature through electric current.

Next, the operation of the above configuration will be explained.

First, when you want to turn on the bulb 1 to obtain a downward light distribution, turn on a switch (not shown) provided in the vehicle interior. When this switch is turned on, a current flows through the shape memory alloy member 23 and the temperature becomes high, so that the shape memory alloy member 23 assumes an L-shape, and the auxiliary lens 9 is brought into use in an upright position as shown in FIG. And among the rays from bulb 1,
The reflected light reflected above the paraboloid 3 of the reflector 5 is refracted by the upper part 13 from the boundary line L of the lens 7, resulting in a light distribution as shown in FIG. Further, the reflected light reflected from the lower side of the paraboloid 3 of the reflector 5 is refracted by the auxiliary lens 9 into downward light, and is diffused to the left and right by the lower part 15 from the boundary line L of the lens 7. The light distribution becomes as shown in FIG. 6, and the light distribution as shown in FIG. 4 is enhanced.

Next, when you want to turn on bulb 1 to obtain an upward light distribution, turn on the switch (not shown) inside the vehicle.
is turned off to cut off the current to the shape memory alloy member 23. When no current flows through the shape memory alloy member 23, the shape memory alloy member 23
Since it is not possible to maintain the letter-like shape, the spring 21 of the auxiliary lens 9 biases the lens 9 into a laid-down position as shown in FIG. 3, when it is not in use.
At this time, among the light rays from the bulb 1, the reflected light reflected by the lower half of the paraboloid 3 of the reflector 5 is diffused to the left and right by the lower part 15 from the boundary line L of the lens 7, and The light distribution is as shown in Figure 7. This light distribution and the light distribution as shown in FIG. 4 due to the reflected light reflected by the upper half of the paraboloid 3 of the reflector 5 are combined, resulting in the upward light distribution as shown in FIG. is obtained.

8 to 10 show other embodiments of the present invention. In this embodiment, the auxiliary lens 9, which is similar to that of the above embodiment, is moved by a separate actuator. That is, the auxiliary lens 9 is connected to a motor 29 via a link 25 and an arm 27, and is configured so that rotation of the motor 29 moves the auxiliary lens 9 between a used state and a non-used state.

FIG. 10 shows an electrical circuit diagram of the above configuration. When the low beam switch 31 is turned on, the relay 35 is activated through the contact plate switch 33.
is turned on, the motor 29 operates and the auxiliary lens 9
As shown in FIG. 8, the machine is in a standing position. When the auxiliary lens 9 is in a completely upright position, the contact plate switch 33 is moved, the relay 35 is turned off, and the motor 29 is stopped. When bulb 1 is set to high beam or OFF, no current flows from low beam switch 31, so relay 3
7 is turned on. Then, the relay 35 is turned on through the contact plate switch 33, the motor 29 is activated, and the auxiliary lens 9 is placed in a collapsed position as shown in FIG.

Note that this invention is not limited to the above embodiments.
For example, the upper edge of the auxiliary lens 9 may be colored to make the cut line clearer.

(f) Effects of the Invention As is clear from the above, according to the configuration of the present invention, when the auxiliary lens is in use, the upward reflection direction from the reflector can be refracted downward, and the auxiliary lens can be used as downward light. can do. Therefore, even in the case of downward light, the reflector can be fully utilized and a sufficient amount of light can be obtained.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a lighting lamp according to an embodiment of the present invention, FIGS. 2 and 3 are side sectional views showing the operating state, and FIGS. 4, 5, 6, and 7. is an explanatory diagram of the light distribution state, FIGS. 8 and 9 are explanatory diagrams of the operation state according to other embodiments, and FIG.
9, FIG. 11 is a side sectional view of a lighting lamp according to a conventional example, and FIG. 12 is an electric circuit diagram with the configuration shown in FIG.
FIG. 2 is an explanatory diagram of a valve having the configuration shown in FIG. 1; (Explanation of symbols representing main parts of drawings) 1
... Bulb, 5... Reflector, 7... Lens, 9... Auxiliary lens, {9... Shape memory alloy member, 21... Spring} Actuator, {25... Link, 27
...Arm, 29...Motor} Actuator.

Claims (1)

[Claims] 1. In an illumination lamp consisting of a light emitting bulb, a reflector that reflects the light emitted from the bulb forward, and a lens that refracts the reflected light from the reflector,
The present invention is characterized by comprising an auxiliary lens interposed between the bulb and the reflector and movable between a used state in which upward light is turned into downward light and an inactive state in which it is laid down, and an actuator for moving this auxiliary lens. Lighting lamp.