JPS6335455B2 - - Google Patents

Abstract

PURPOSE:To make a proper function attainable even in time of wrong operation happening in a light switch, by installing a control transistor which is turned to On in time of making the light switch into a lighting position of a light body. CONSTITUTION:A control transistor 6, a first timer 5 and a second timer 7 are installed altogether. When a light switch 2 is selected to an ON-terminal 2a, a driving relay 3 is energized with current via an OR circuit 4. And, with excitation of an exciting coil 3a, a contact 3b is selected to an up-terminal 3c and feeds a driving signal which drives a light body to situate an upright position. With this constitution, the light body shifts from a housing position to the upright position and comes to a stop. Likewise, the light body is lighted by this operation. At this time, the control transistor 6 is as well turned to ON, with which a driving transistor 5a of the timer 5 is also turned to ON whereby a condenser C1 comes into a state of being charged as well. On the other hand, the timer 7 keeps an off-state.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a retractable front light-off malfunction prevention device, and is particularly designed to ensure proper operation even when a light switch is erroneously operated, chattering, or passing.

Retractable headlights require a drive system to raise and retract the light body compared to regular fixed headlights, and this drive system also needs to be linked to light switch operation, making them more complex. control is required. Furthermore, in addition to the raising and retracting operations of the lamp body associated with such turning on and off, countermeasures must be taken against the cases where the light switch is erroneously operated and the case where a passing operation is performed.
In the former case, it is necessary that the lamp is in the upright position and does not respond to an erroneous operation such as momentarily turning the light switch to the OFF position and then returning it to the original position while the lamp is on, or to an instantaneous operation caused by the light switch's chattering. This is because the lamp body is turned off and tilted from the upright position to the stowed position, and there is a risk that the driver's field of vision will be cut off, even if only temporarily, while driving. The latter poses a particular problem when the lamp is in the retracted position, but a control system that immediately returns to the upright position in response to a passing operation, maintains the upright position during the operation, and then returns to the retracted position after the operation is completed. is necessary.

The present invention has been made to deal with such circumstances, and provides a control device for a retractable headlamp that allows operation without hindrance to erroneous light switch operations and passing operations. .

The illustrated embodiment will be described in detail below. In the figure, E is a battery, and 1 is a changeover switch, which has an up terminal 1a that is turned on when it is desired to forcibly raise the lamp, and a control terminal 1b that controls and drives the lamp. 2 is a light switch (the lamp and the power supply circuit to the lamp are omitted in this figure, and only the driving system of the lamp is shown), 2a is an on terminal, 2b is an off terminal, and 2c is a vehicle terminal. This is a terminal for a small lamp. 3 is a drive relay that includes an exciting coil 3a, a contact 3b, and this contact 3b.
It consists of an up terminal 3c and a down terminal 3d, which are switched according to the operation of the excitation coil. Contact 3
b is always located at the down terminal 3d, and sends out an operation signal that causes the drive system of the lamp body (not shown in this figure, for example, a motor) to work in the down direction.On the other hand, when the excitation coil 3a is excited, the up terminal 3c It has the function of sending out a drive signal that causes the lamp to be in the upright position. In addition, up terminal 3
c is provided with a drive circuit that raises the lamp body regardless of the operation of the drive relay 3 when the changeover switch 1 is switched to the up terminal 1a. 4 is an OR circuit including diodes D ₁ and D ₂ connected in series to the excitation coil 3a of the drive relay 3. and,
Various signals, which will be explained later, are sent to this OR circuit 4, and the drive relay 3 is
I have set it to work.

The first timer 5 is composed of a driving transistor 5a, a capacitor _C1 for setting a delay time, a resistor _R1 , and a discharging resistor _R2.It operates when the light switch 2 is located at the on terminal 2a and turns off. It has the function of maintaining the exciting coil 3a of the drive relay 3 in an excited state via the diode _D2 of the OR circuit 4 for a certain period of time after being switched to the terminal 2b. This first timer 5 is connected to be operated by a control transistor 6 that is turned on when the light switch 2 is switched to the on terminal 2a, and the light switch 2 is switched on from the instantaneous on terminal 2a to the off terminal 2a.
In response to chattering of the light switch 2 due to an erroneous operation such as being switched to ``b'' or excessive drying, the drive relay 3 is held in an energized state, and the down terminal 3 is
It has the effect of preventing the lamp drive signal from being sent from d. 7 is a second timer, which includes a driving transistor 7a, a capacitor _C2 for setting the delay time, and a resistor.
It consists of R ₃ and a discharge resistor R ₄ . The second timer 7 operates when the passing switch 8 is operated, and at least its delay time is longer than the delay time caused by the first timer 5, which acts to keep the lamp in the upright position. It is set as follows. The reason for this is that while the first timer 5 only requires a short delay time to deal with instantaneous erroneous operation or chatter, the second timer 7
This is because it is necessary to hold the lamp in an upright position during the passing operation.

Next, the operation will be explained.

When the light switch 2 is switched to the ON terminal 2a, the drive relay 3 is energized via the OR circuit 4, and the contact 3b is switched to the UP terminal 3c by the excitation of the excitation coil 3a, driving the lamp to the upright position. Sends a drive signal. As a result, the lamp body moves from the stowed position to the standing position and stops, and is turned on by the above operation. At this time, the control transistor 6 is also turned on, and thereby the driving transistor 5a of the first timer 5 is also turned on, or the capacitor C ₁
is also in a charging state. On the other hand, the second timer 7 remains off. When the light switch 2 is switched to the OFF terminal 2b, the lamp goes out, while the first timer 5 turns on the drive transistor 5a due to the discharge of the capacitor _C1 , continues to excite the excitation coil 3a, and then turns off. Therefore, with this time delay, the lamp body reaches the stowed position from the standing position. This delayed operation is performed by light switch 2.
It does not have much meaning when operated to turn off or turn on the light, but it becomes extremely effective in case of erroneous operation or chattering. That is, this is a case where the light switch 2 chattering occurs due to an erroneous operation or forced operation, such as instantaneous switching of the light switch 2 from the on terminal 2a to the off terminal 2b. Normally, if these were present, a drive signal would be sent to drive the lamp in the retracted direction, acting in the direction of tilting the optical axis of the lamp, even if it was instantaneous, but as mentioned above, the first timer 5 will cause a drive signal to be sent out for a certain period of time to tilt the optical axis of the lamp. Since the excitation coil 3a of the drive relay 3 is maintained in an excited state, the lamp body is maintained in the upright position, and an avoidance effect against these is obtained.

Next, a case where a passing operation is performed will be explained. When the passing switch 8 is turned on when the lamp body is in the storage position, the second timer 7 is energized, the capacitor _C2 is charged, and the drive transistor 7a is turned on, and the voltage is passed through the diode _D1 of the OR circuit 4. The drive relay 3 is energized,
In order to excite the excitation coil 3a and switch the contact 3b to the up terminal 3c, a lamp drive signal is sent,
The lamp body reaches the upright position. At this time, the passing switch 8 is repeatedly turned on and off due to its operation, and when it is turned off, the power supply circuit to the second timer 7 is cut off.
The discharge of C ₂ maintains the drive transistor 7a in the on state, thereby preventing the contact 3b of the drive relay 3 from returning. When the packing operation is completed, the power to the drive relay 3 is cut off after the delay time set by the second timer 7 has elapsed, and the contact 3
The lamp body moves from the upright position to the retracted position by a signal from the down terminal 3d generated by the return of the lamp. Even if the above-mentioned passing operation is performed with the light switch 2 switched from the off terminal 2b to the small lamp terminal 2c, the lamp will remain in the upright position rather than the stowed position, and after this operation is completed, it will return to its original position. Return to storage position. Furthermore, if the above operation is performed with the light switch 2 switched from the ON terminal to the small lamp terminal 2c, the lamp body is already in the upright position, so no change occurs in the lamp body. In other words, light switch 2 is connected to small lamp terminal 2c.
In the passing operation in the state where the power is turned on, both the on terminal 2a and the off terminal 2b are opened, so the driving transistor 5a and the control transistor 6 of the first timer 5 each maintain the off state in the former example, and the latter This is because in the example shown in FIG. The reason for this behavior is
This is because the OR circuit 4 including diodes D ₁ and D ₂ is provided to separate the two timers so that the operation of the second timer 7 does not interfere with the self-holding operation of the first timer 5 and the control transistor 6.

Therefore, according to the device of this invention, if the light switch is accidentally turned on to the OFF terminal while driving at night, or even if the light switch is chattering, the lamp body will immediately tilt in the storage direction, which is an inconvenience. In addition, even if the lamp body is in the retracted position and there is a passing operation, it will stand up in response to the operation and return to the retracted position after the operation is completed, making it a retractable headlight. This has the effect of solving all the problems of incorrect light switch operation and passing operations.

In addition, since the delay time of the timer that operates when the light switch is incorrectly operated or chattering, and the delay time of the timer that operates when the passing operation occurs are obtained by independent timers, it is possible to obtain the delay time that suits the purpose. can. Furthermore, the apparatus of the present invention does not cause any trouble even if the above-mentioned erroneous operation, chattering or passing operation occurs when the light switch is turned on to the small lamp terminal.

[Brief explanation of the drawing]

The figure is a circuit diagram of this invention device. 1... Selector switch, 2... Light switch,
3... Drive relay, 4... OR circuit, 5... First
Timer, 6... Control transistor, 7... Second
Timer, 8...Passing switch.

Claims (1)

[Claims] 1. A drive relay that sends a drive signal for raising or retracting the lamp in response to the operation of the light switch, a control transistor that turns on when the light switch is placed in the lighting position of the lamp, and the control a first timer which is energized by the on operation of the transistor and which prevents the drive relay from sending out a drive signal for retracting the lamp when instantaneously extinguishing the lamp while it is lit; A second timer is provided, which operates the drive relay to send out a drive signal to raise the lamp when the passing switch is operated at a certain time, and sends a drive signal to retract the lamp after this operation is completed. , and the first timer is turned on by the on operation of the control transistor, and then self-holds when the light switch is in a position other than the on position or the off position, and the light switch is set to the off position of the lamp body. When the first timer is turned on, self-holding is canceled and turned off after the first timer works, and this output current and the output current of the second timer are supplied to the drive relay via an OR circuit. A malfunction prevention device for a retractable headlamp, characterized by: