JPH0247526Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a vehicle headlamp, and more specifically, the present invention relates to a headlamp for a vehicle, and more specifically, a light bulb positioned in front of the reflector of the headlamp is moved in the front-rear direction. This invention relates to an improvement in a vehicle headlamp that is configured so that the light distribution can be changed.

[Conventional technology]

Vehicle headlights should be directed downwards to avoid dazzling the drivers of oncoming vehicles at night, etc., and should be directed upwards to make it easier to see far ahead, especially when there are no oncoming vehicles. . The bulb structure of the headlamp in this case has two filaments arranged in one bulb, and the filaments are switched as necessary.

Further, as shown in Japanese Utility Model Application No. 57-170339, a light bulb positioned in front of the reflector is connected to a movable part of a drive device such as a solenoid so as to be movable with respect to the reflector. Also known is a drive device in which the movable part of the drive device is configured to move in conjunction with the traveling speed. That is, by moving the light bulb to the rear of the reflector using a solenoid drive, the light emitted from the headlight is focused and brightened.
Conversely, by moving the light bulb, the light emitted from the headlights is diffused, making the entire headlight darker.

[Problem that the invention attempts to solve]

The present invention relates to the latter type of headlamp in which the irradiation distribution of the headlamp can be changed by moving one light bulb. The light bulb is simply moved forward and backward using a manual switch or a command signal from a vehicle speed sensor. In other words, the speed at which the light bulb is moved backwards (the light bulb condenses and becomes brighter) and the speed at which the light bulb is moved forward (the light bulb diffuses and becomes darker) are constant depending on the sliding speed of the solenoid drive shaft. Because of this, the changes in the switching irradiation light are not as adaptable to the eyes, which poses a problem in that it poses a danger to driving operations.

The present invention was developed in view of the problems in the prior art described above, and provides a vehicle headlamp in which the speed at which the light bulb is moved back and forth is adjusted to suit the eye's adaptability, thereby eliminating any hindrance to driving operations. The purpose is to

[Means for solving problems]

The vehicle headlight of the present invention has a structure in which the light bulb placed in front of the reflector of the headlight is moved in the front and back direction to change the light distribution. The light bulb is configured to move at a slower speed when moving the light bulb forward and diffusing the light from the headlamp, compared to the speed at which the light bulb moves when concentrating light to make it brighter.

[Effect]

The vehicle headlight according to the present invention controls the movement of the headlight bulb by driving a motor, and the vehicle headlight has the following features:
The light bulb moving speed when moving the bulb forward and diffusing the bulb's light to make it darker is faster than the bulb moving speed when moving the bulb backwards and concentrating the bulb's light to make it brighter. The current is limited and slowed down by a resistor inserted into the circuit, making it more adaptable to the eyes of the driver.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows a motor control circuit for a headlamp bulb drive device. In the figure, 10 is a relay coil having a contact 13 inserted in series with the power circuit of the motor 6, and 11 is also connected in series with the power circuit of the motor 6. A relay coil having a contact 14 inserted therein, 12 a manual switch which is operated to control the light bulb in the forward and backward direction, 15 a current limiting resistor inserted between the power supply Vcc and the contact 14, which slides the light bulb. However, this is to limit the current flowing through the motor 6 when switching from a bright state to a dark state.
Reference numerals 8 and 9 indicate micro switches inserted between the relay coils 10 and 11 and the ground terminal, which are opened when the light bulb position reaches a predetermined position.

Further, FIG. 2 is a structural diagram of a headlamp using the motor control circuit of FIG. 1, and the same reference numerals as in FIG. 1 indicate the same parts. In FIG. 2, 1 is a lens, 2 is a reflecting mirror, 3 is a light bulb, and 4 is a slider to which the light bulb 3 is attached, for moving the light bulb 3 in the directions of arrows A and B. Reference numeral 5 denotes a screw (male thread) which is screwed into a female thread formed on the inner wall of the slider 4. 6 is a motor, and its drive shaft is connected to the screw 5. Reference numeral 7 indicates a motor control circuit having the circuit configuration shown in FIG. In some cases, the micro switch 9 is operated by a projection 4' formed on the slider 4.

Next, the operation will be explained. First, when the manual switch 12 is set to the forward rotation position, the micro switch 8 is in the open state as shown in the figure, so the relay coil 1
A current flows through 0 and it is excited. As a result, the contact 13 is switched to the position shown by the solid line in the figure, and the motor 6 is connected to the power supply Vcc - contact 13 - motor 6 - contact 14 -
Ground and current flow, and the motor 6 rotates in the normal direction. By normal rotation, the slider 4 moves and moves the light bulb 3 from the B position to the A position. At this time, the micro switch 8 which was pressed by the protrusion 4' of the slider 4 is opened, so the contact 13 is switched to the dotted line side and the motor drive is stopped. That is, the light bulb 3 is in the retracted position.

Next, when the manual switch 12 is switched to the reverse direction, the relay coil 11 is excited in the same manner as described above, and the contact 14 is placed in the dotted line position, thereby forming a current circuit for the motor 6. That is, motor 6
The power supply Vcc - resistor 15 - contact 14, motor 6
-Contact 13-ground and current flows, and the motor 6 rotates in the opposite direction. As a result, the slider 4 moves from the A position to the B direction as shown by the arrow, presses the micro switch 9 at the maximum movement position, and opens the micro switch 9 to cut off the circuit and start the motor. 6 stops.

In this way, when the motor 6 rotates in the normal direction, that is, when the light bulb 3 moves from arrow B to direction A, the light from the light bulb is focused and becomes brighter. When the light bulb 3 moves from the arrow A to the arrow B direction, the light emitted by the light bulb 3 is diffused and becomes darker, but the current is small by the current limit by the resistor 15, and the moving speed of the slider 4 becomes slow.

That is, when the light irradiation from the headlight bulb 13 changes from "dark" to "bright", the slider 4 moves at a high speed, but when the light irradiation changes from "bright" to "bright", the slider 4 moves at a high speed.
When the color changes from "dark" to "dark", the current is limited by the resistor 15, the current flowing to the motor 6 becomes smaller, and the moving speed of the slider 4 slows down, so the driver's eyes adapt to the light and safe driving becomes possible. can.

[Effect of idea]

As is clear from the above-mentioned embodiments, according to the present invention, the light bulb of the headlight is moved forward, and the "brightness" and "darkness" of the irradiated light are controlled by focusing and diffusing the irradiated light. In this system, the speed of switching from "bright" to "dark" is controlled to be slower than the speed of switching from "dark" to "bright," so that the illumination light that adapts to the driver's eyes can be obtained, making it easier for the driver. has the advantage of allowing safer driving operations.

[Brief explanation of the drawing]

FIG. 1 is a circuit configuration diagram of a motor control circuit for a moving light bulb type headlamp according to the present invention, and FIG. 2 is a cross-sectional side view showing the internal structure of the headlamp. 2...Reflector, 3...Light bulb, 4...Slider, 5...Screw, 6...Motor, 7...Motor control circuit, 8, 9...Micro switch, 1
0, 11... Relay coil, 12... Manual switch, 13, 14... Contact, 15... Resistor.

Claims (1)

[Scope of utility model registration request] In a vehicle headlamp in which the irradiation light distribution can be changed by moving the light bulb located in front of the reflector body of the headlight in the front and back direction, the light bulb for the headlight is attached and the light bulb is a slider for moving the slider in the front-back direction, a motor for sliding the slider, and driving and controlling the motor;
Motor control to slow down the light bulb movement speed to move the light bulb to the rear position and make the headlights ``dark'' compared to the light bulb movement speed that moves the light bulb to the rear position to make the headlights ``bright''. A vehicle headlamp comprising a circuit.