JP2001319506A - Light distribution changeable head lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem on a conventional head lamp using a solenoid for light distribution change that a driver clearly hears loud impact noises generated during operating the solenoid, giving a great decrease in quality. SOLUTION: This light distribution changeable head lamp comprises a resin nut 8 provided on a plunger 6b of a solenoid 6, on which a connecting bar 7 is mounted to be interconnected with a shading plate 5. An air damper 81 is provided on a face 8a of the resin nut 8 at the side of the plunger in the direction of suction and a stress relaxing node 7d, to which proper bending is applied between the shading plate 5 and the resin nut 8, is provided on the connecting bar 7. Impact noises generated during light distribution change are relaxed by the air damper, resulting in no unusual feeling given to a user.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular lamp for lighting such as a headlamp, and more particularly, a passing light source and a traveling light source such as a metal halide discharge lamp cannot be provided at a position close to each other. The present invention relates to a vehicular lamp in which, when a light source is adopted, a light distribution can be switched by moving components involved in light distribution such as a light source, a lens, and a light shielding plate.

[0002]

2. Description of the Related Art FIG. 6 shows an example of the configuration of a conventional light distribution switching type headlamp 90 of this type when a light shielding plate 94 is moved, and one light source such as a metal halide discharge lamp is shown in FIG. In contrast to the light source 91 having only the light source 91, the reflecting surface 92 is formed in a shape of substantially only the upper half.
And a reflecting surface 92b having a focal point f2 behind the light source 91.

A hood 93 is provided above the light source 91.
Is provided with a light-shielding plate 94 that performs an arc motion by a pivot, and a solenoid 95 is connected to the light-shielding plate 94 so as to be movable between a passing position and a running position. The light shielding plate 94 is provided with a solenoid 95.
Is not driven, the return spring 96
Thereby, the portion of the reflection surface 92a is covered from the light source 91.

With this configuration, the solenoid 9
When the light source 5 is not driven, the light is applied only to the reflecting surface 92b having the focal point f2 behind the light source 91, so that the light projected from the light distribution switching type headlamp 90 to the outside is directed downward. It is suitable for passing light distribution.

Here, when the solenoid 95 is driven, the light shielding plate 94 moves so as to also apply light to the reflection surface 92a, and the light source 91 has a reflection surface 9 having a focal point f1.
From 2a, a light beam parallel to the irradiation axis Z is projected to the outside, which is suitable for traveling light distribution for irradiating a distant front.

Here, when the driving of the solenoid 95 is stopped, the light shielding plate 94 returns to a position covering the reflection surface 92a by the return spring 96, and automatically returns to the passing light distribution. When the light-shielding plate 94 performs an arc motion as described above, the connection with the solenoid 95 that performs a linear motion is performed through the connecting rod 97.

[0007]

However, in the light distribution switching type headlamp 90 having the above-described structure, when the solenoid 95 is driven first, the bobbin 9 is driven at a high speed.
The plunger 95b is sucked into the inside 5a, and the bobbin 95a and the plunger 95b collide with each other, generating a loud collision sound, giving a user a sense of incongruity and deteriorating quality.

Secondly, in order to improve the efficiency of the solenoid 95, the gap between the bobbin 95a and the plunger 95b is set to be very small.
When a force other than the operation direction of 5b is applied, the bobbin 95a and the plunger 95b are often caught, resulting in a malfunction and a decrease in the reliability of the light distribution switching headlamp 90.

Thirdly, especially when returning to the passing light distribution in which the attraction force due to the magnetic force does not act, the connecting rod 96 is liable to be bounced or overrun due to the backlash or deformation thereof. This causes light to leak to the outside, causing flickering at the time of switching, causing problems such as giving an illusion to an oncoming vehicle or the like, and causing a problem that performance is impaired.

[0010]

According to the present invention, as a concrete means for solving the above-mentioned conventional problems, a light distribution forming member is moved between a passing position and a running position by a solenoid, and the passing light distribution and traveling distribution are performed. In a light distribution switching type headlamp configured to switch between light and light, a resin nut having a connecting rod connected to the light distribution forming member is provided on a plunger of the solenoid, and the plunger of the resin nut is provided. An air damper is provided on the surface in the suction direction to reduce the impact sound when the stopper comes into contact with the stopper, and the connection rod is appropriately bent between the light shielding plate and the resin nut to provide a stress relief section. Wherein the stopper is provided with a notch for facilitating assembly with the nut attached to the plunger. It solves the problem by providing a type headlamp.

[0011]

Next, the present invention will be described in detail based on an embodiment shown in the drawings. 1 is a light distribution switching type headlamp according to the present invention. The light distribution switching type headlamp 1 employs a light source 2 having only one light source such as a metal halide discharge lamp. The reflecting mirror 3 is provided with a traveling reflecting surface 3a having a focal point f1 at the light source 2 and a passing reflecting surface 3b having a focal point f2 behind the light source 2.

A light shielding plate 5 on which a part of the hood 4 is movable.
The light-shielding plate 5 is connected to the solenoid 6 via a connecting rod 7. Further, when the solenoid 6 is not driven on the light-shielding plate 5, the light-shielding plate 5 runs relative to the light-shielding plate 5. It is the same as the conventional example in that a return spring 5a for providing a position for covering the reflective surface 3a is provided.

Here, in the present invention, as shown in FIGS. 2 and 3, a resin nut 8 is provided on the plunger 6b of the solenoid 6. In this embodiment, the resin nut 8 is connected to the end face 8a on the suction side. By bringing the end face 8b on the opposite side into contact with the stopper, a necessary moving distance is provided to the light shielding plate 5. In this embodiment, it is assumed that the suction-side end surface 8a contacts the bobbin 6a of the solenoid 6, and the opposite end surface 8b contacts the plate-like stopper 8c to set a predetermined stroke. I do.

As described above, the plunger 6b is
When the plunger 6b stops at each position, the resin member and the metal member collide with each other, and the collision is significantly reduced as compared with the conventional example in which the metal members collide with each other. Thus, the end face 8b on the opposite side where the collision is performed by the force of the return spring 5a can be reduced to a level that does not cause any practical problem.

However, in order to reduce the collision sound on the suction side end face 8a where the suction is performed by the bobbin 6a and the acceleration is performed, the above configuration alone is somewhat insufficient. And an air damper 81 formed of a flexible and highly elastic member such as a rubber member.

The air damper 81 has a bubble-shaped hollow portion 8 extending in the direction of collision from a base 81a formed of a soft member such as a rubber member having an appropriate thickness and formed in a desk shape.
When the solenoid 6 is actuated, the hollow portion 81b first comes into contact with the bobbin 6a, and is compressed and deformed to absorb the shock and reduce the generated collision sound (FIG. 3). See).

In the present invention, as described above, the plunger 6
b, a resin nut 8 is attached to the end face 8 of the resin nut 8.
Since the stroke of the plunger 6b is set by a and 8b, the stopper 8c corresponding to the end face 8b on the opposite side must be set within the range of the length of the plunger 6b.

Therefore, the end face 8b on the opposite side of the resin nut 8
When the entire surface of the headlight is brought into contact with the stopper 8c, the plunger 6b penetrates through the stopper 8c, which is expected to complicate the assembling process of the light distribution switching headlamp 1. Therefore, in the present invention, a notch 8d is provided in the stopper 8c as shown in FIG.
The stopper 8c can be attached without penetrating through.

FIG. 5 shows the structure of the connecting rod 7 of the present invention. According to the result of the study by the inventor of the present invention, the flicker immediately after switching from the traveling light distribution to the passing light distribution is the same as that of the connection rod. It was found that the deformation of the rod 7 was the major cause. Then, it has been clarified that the deformation causes stress to concentrate on the bent portion of the connecting rod 7 during operation.

Therefore, in the present invention, the rod-shaped portion 7c of the connecting rod 7 between the plunger connecting portion 7a and the light-shielding plate connecting portion 7b is also appropriately bent to form a stress relaxing node 7d. By doing so, the stress concentrated on the connecting portion 7e between the plunger connecting portion 7a and the rod portion 7c and the rod-shaped portion 7c is linear is distributed to the connecting portion 7e and the stress relaxation node 7d, and the entire deformation is performed. Reduce the amount to prevent flickering.

[0021]

As described above, according to the present invention, the plunger of the solenoid is provided with the resin nut provided with the connecting rod for connecting to the light distribution forming member, and the suction direction of the plunger of the resin nut is provided. An air damper is provided on the side to be used to mitigate the impact sound when it comes into contact with the stopper.The connecting rod is appropriately bent between the light shielding plate and the resin nut to provide a stress relief node. Is a light distribution switchable headlamp with a notch to facilitate assembly with the resin nut attached to the plunger.First, it is generated when the light distribution is switched by the air damper. This is an extremely excellent effect of improving the quality of this type of light distribution switching type headlamp by alleviating the collision sound and preventing the user from feeling uncomfortable.

Second, the connecting rods are provided with stress relief nodes to reduce deformation of the connecting rods due to stress during movement, thereby preventing the occurrence of flickering that occurs immediately after light distribution switching. This type of light distribution switching type headlamp is extremely effective in improving the performance of this type of light distribution-type headlamp as it does not cause dazzling in the car.In addition, this type of light distribution is provided by providing a notch in the stopper. It is also effective in reducing the number of man-hours for assembling the light switching headlamp.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an embodiment of a light distribution switching type headlight according to the present invention.

FIG. 2 is an explanatory diagram showing a resin nut as a main part of the same embodiment in a state of passing light distribution.

FIG. 3 is an explanatory view showing the resin nut in a state of traveling light distribution.

FIG. 4 is an explanatory view showing a stopper which is a main part of the same embodiment.

FIG. 5 is an explanatory diagram showing a connecting rod which is a main part of the same embodiment.

FIG. 6 is an explanatory diagram showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Light distribution switching type headlamp 2 ... Light source 3 ... Reflecting mirror 3a ... Reflecting surface for traveling 3b ... Reflecting surface for passing 4 ... Hood 5 ... Light shielding plate 5a ... Return spring 6 ... Solenoid 6a Bobbin 6b Plunger 7 Connecting rod 7a Plunger connecting part 7b Light shielding plate connecting part 7c Rod part 7d Stress relief joint 7e Connecting part 8 Resin nut 8a ... End surface 8b on suction side 8c... Stopper 8d... Notch 81... Air damper 81a... Base 81b.

Claims (1)

[Claims] 1. A light distribution switching type headlight in which a light distribution forming member is moved between a passing position and a running position by a solenoid, and a light distribution switching headlight is switched between a passing light distribution and a traveling light distribution. An air damper is provided, which is provided with a resin nut to which a connecting rod for connecting to the light distribution forming member is attached, and on a surface of the resin nut on the side of the plunger in the suction direction, the impact noise when the stopper comes into contact with a stopper. The connection rod is provided with a stress relief node by appropriately bending between the light shielding plate and the resin nut, and the stopper is assembled to the nut mounted on the plunger. A light distribution switching type headlamp characterized in that a cutout portion is provided to facilitate the light distribution.