JPS635301B2 - - Google Patents

Abstract

PURPOSE:To prevent a retractable head lamp from being stopped at a position other than the normal position even though a manual switch is erroneously operated, by keeping a head lamp at the normal position even if a manual switch is instantaneously operated. CONSTITUTION:When a manual switch 4 or 5 is instanteneously operated under an errorneous operation (the contact point 5a is switched in a sequence, 5b 5C 5b), a change-over relay 3 is operated through contact pieces 4b' and 3a' to cause the motor 1 to be stopped at a position where a position sensor 2 is slightly opened. However, capacitor 9a in a delay circuit 9 is charged when the contact point 5a is instantaneously changed over to a forcibly released terminal 5C, and after the contact point 5a is returned t its original position, a base current of a transistor 7 flows to operate a change-over relay 6. Driving time of a motor 1 is extended and the contact piece 4c' exceeds the range of a storing position sensor part 2b. Thereafter, even if the change-over relay 6 is returned back to its original position, the relay coil 3a is excited, the contact piece 4c' reaches again the storing position sensor part 2b to stop the motor.

Description

[Detailed Description of the Invention] This invention relates to a control device for a retractable headlamp, and in particular, it is designed to prevent the headlamp from stopping at a position other than its proper position even if a manual switch is erroneously operated. It is something.

Retractable headlights have been proposed that are in an open position when turned on and retracted into the vehicle body when turned off. For example, some headlights are stored and opened using the power of a motor, and when the headlight reaches the stored or opened state, the power to the motor is cut off and one of the positions is maintained. This is how it was done.

Figure 2 shows a control circuit for a conventional retractable headlamp, showing a motor 1 that is the power source for the opening and storage mechanism of the retractable headlamp (not shown), and the rotation of this motor 1. A relay circuit 3 that cuts off the power to the motor 1 when the position sensor 2 detects the opening of the headlight or a storage device, and a headlight ON terminal 4
b, a manual switch 4 for normal operation having an off terminal 4c, a small lamp terminal 4d and a contact 4a, and a manual switch 5 having a normal terminal 5b communicating with the manual switch 4, a forced open terminal 5c and a contact 5a. It is configured.

The position sensor 2 is configured to rotate in conjunction with the motor 1, and has a conductive layer 2a on its surface, and a part of the conductive layer 2a near the center is removed to make a non-conductive part, which is the storage position of the headlamp. It consists of a detection section 2b and a headlamp open position detection section 2c whose outer periphery is partially removed to make it a non-conductive section. The conductive layer 2a of the position sensor 2 has a contact piece 3a' which remains in contact regardless of the rotational position of the position sensor, and the other end is connected to the relay coil 3a of the relay circuit 3. Then, by excitation of the relay coil 3a, the contact 3b is switched from the open terminal 3d to the power terminal 3c, and the motor 1
The function is to energize the. Further, the conductive layer 2a has one end connected to an on terminal 4 of the manual switch 4.
The contact piece 4b' connected to the OFF terminal 4c is in contact with the contact piece 4c' whose one end is connected to the off terminal 4c.
b' is located near the center including the light-off position detection section 2b.

Therefore, when the contact 4a of the manual switch 4 is switched to the OFF terminal 4c, the headlight is turned off, and the contact pieces 4c' and 3a' become energized through the conductive layer 2a, thereby exciting the relay coil 3a. As a result, the contact 3b is switched to the power supply terminal 3c, and the motor 1 is driven. At this time, the position sensor 2 also rotates, and when the storage position detection section 2b reaches the contact piece 4c', the power to the relay coil 3a is cut off and the motor 1 is stopped. That is, this is the position where the retractable headlight is turned off and retracted.

When the contact of the manual switch 4 is connected to the ON terminal 4b, the headlights are turned on and the contact pieces 4b' and 3 are turned on.
a' is electrically connected, the motor 1 is driven, the position sensor 2 rotates, and when the open position detecting portion 2c reaches the contact piece 4b', the power to the motor 1 is cut off and stopped. In other words, the retractable headlight is turned on and released (position sensor 2 is in the position shown in FIG. 2). Note that the forced release terminal 5c of the manual switch 5 is
This is a terminal for moving from the storage position to the open position regardless of the headlight lighting operation.

As explained above, when the manual switches 4 and 5 are operated normally, operations such as retracting, opening, or forced opening with the headlights turned off are performed without any problem, but for example, when the headlights are turned on and released, If the contact 4a of the manual switch 4 is turned on to the instantaneous off terminal 4c due to a mistake, etc., and then turned back on, the motor 1 will be energized and will rotate slightly, causing the headlights to turn off slightly. It stops when it is about to close. The reason for this is that the power supply to the motor 1 is stopped while the contact piece 4c' remains within the area of the storage position detection section 2b. The same thing is
This occurs even when the contact 4a is set to the on terminal 4b rather than the off terminal 4c, and the headlight stops in a slightly open state. Also, in the manual switch 5, the contact 5
This can also occur when a is momentarily applied to the forced open terminal 5c.

However, retractable headlights form the outer surface of the vehicle body when stored, so if they are left slightly open, they may not look good.
Furthermore, if pressure is applied carelessly, the opening/closing mechanism may be deformed, which may cause failure. Furthermore, while a normal light distribution can be obtained in the open position, if the lens is tilted slightly in the storage direction from the normal open position due to the above-mentioned erroneous operation, the desired light distribution cannot be obtained. Naturally, if the widths of the storing position detecting section 2b and the open position detecting section 2c are made sufficiently narrow, even in the case of instantaneous switch operation as described above, each detecting section 2b, 2
The contact pieces 4b' and 4c' do not stay in the area c, but this requires high precision and the inertia of the motor itself must be taken into account, so mass-produced products are not recommended. However, the manufacturing process becomes complicated, making it unsuitable.

The present invention has been made in order to cope with the situation, and provides a retractable headlamp control device that maintains the headlamp in its normal position even if a manual switch is instantaneously activated.

Preferred embodiments of this inventive device will be described below. In the drawings, the same operating members and equivalent parts are indicated by the same reference numerals.

Reference numeral 6 denotes a signal switching relay for setting a retractable headlamp (not shown) to an open or retracted position, which includes a relay coil 6a, a contact 6b, and a retractable terminal 6c.
and an open terminal 6d, and the contact 6b is configured to switch to the open terminal 6d only when the relay coil 6a is excited. The storage terminal 6c is connected to a contact piece 4c' that is in contact with the circumferential surface that includes the storage position detection section 2b of the position sensor 2, and the open terminal 6d is connected to the circumference surface that includes the lighting position detection section 2c. It is connected to the contact piece 4b'.

Reference numeral 7 denotes a transistor for driving the switching relay 6, which is connected in series with the relay coil 6a, so that when the transistor 7 is turned on, the contact 6b described above is switched.

Reference numeral 8 denotes a transistor that is turned on or off in response to the operation of the manual switch 4 for normal operation, and is connected so that the transistor 7 is turned on when the transistor 8 is turned on.

Reference numeral 9 denotes a delay circuit composed of a capacitor 9a and a resistor 9b, and when either manual switch 4 or 5 is operated so that the transistor 7 is instantaneously turned off or turned on, the headlights are turned off regardless of the operation. It acts to maintain the normal position.

Next, the operation will be explained.

(1) When forcibly opening the contact 5a of the side panel 5 can be connected to the open terminal 5c, and as a result, the contact 4b' of the position sensor 2 is directly energized, so the conductive layer 2a - the contact 3a A closed circuit is formed leading to the relay coil 3a, the motor 1 is driven, and the position sensor 2 rotates until the open position detecting section 2c reaches the position of the contact piece 4b' and then stops.

(2) If you want to change the headlight from the stowed position to the open position and turn it on (provided that the contact 5a is at the normal terminal 5b), connect the contact 4a of the manual switch 4 to the on terminal 4b. As a result, the headlights are turned on, and at the same time transistors 8 and 7 are turned on, relay coil 6a of switching relay 6 is energized, and contact 6b is switched to open terminal 6d. Hereafter, the above
The same operation as in (1) will bring the headlights to the open position. Even if the contact 4a is switched to the small lamp terminal 4d in this state, the collector current of the transistor 7 also flows to the base terminal of the transistor 8, resulting in a self-holding state, and the contact 6b of the switching relay 6 will not switch to the storage terminal 6c. do not have.

(3) If you want to change the headlight from the open position to the stowed position and turn it off (provided that the contact 5a is at the normal terminal 5b), connect the contact 4a of the manual switch 4 to the off terminal 4c. As a result, the headlight is turned off, and at the same time, transistor 7 and transistor 8 are also turned off. Therefore, the contact 6b of the switching relay 6 returns to the storage terminal 6c, and a closed circuit is formed from the contact piece 4c' of the position sensor 2, the conductive layer 2a, the contact piece 3a', and the relay coil 3a of the switching relay 3. The motor 1 is driven and the position sensor 2 is also rotated. When the storage position detection section 2b of the position sensor 2 reaches the contact piece 4c', the switching relay 3 is de-energized and the motor 1 is also stopped. When the front light goes out, it means that it has returned to its normal storage position.

Next, a case where the manual switch 4 or the manual switch 5 is instantaneously operated by mistake or the like will be explained.

(4) When the contact 5a is changed from 5b to 5c to 5b (however, the contact 4a is the OFF terminal 4c), this instantaneous action operates the switching relay 3 through the contact piece 4b' and the contact piece 3a', and the motor 1 is instantaneously driven to try to stop the position sensor 2 at a slightly rotated position, that is, at a position where the headlights are slightly open, but there is a delay when the contact 5a switches to the instantaneous forced open terminal 5c. The capacitor 9a of the circuit 9 is charged, and after the contact 5a is restored, this discharge current flows as the base current of the transistor 7, turning off the transistor 7 for a certain period of time and operating the switching relay 6. As a result, the driving time of the motor 1 is extended, and the contact piece 4c' exceeds the area of the storage position detection section 2b. After that, even if the switching relay 6 is restored by turning off the transistor 7, the relay coil 3a of the switching relay 3 is excited through the contact piece 4c' and the contact piece 3a', and the contact piece 4c' reaches the storage position detection part 2b again. The motor 1 will then stop. In other words, even in the event of an erroneous operation as described above, the headlight will always remain in its normal storage position.

(5) Contact 4a momentarily changes from 4c to 4b to 4c or 4
b (or 4d) → 4c → 4b (or 4d) (However, contact 5a is the normal terminal 5b.) The former is a case where the headlight is in the retracted position and the momentary opening operation is performed. , in this case, the above (4)
As shown in FIG. 2, the transistor 7 is temporarily activated by the delay circuit 9, and the headlight is always held in its normal storage position.

The latter case occurs when the headlight is in the open position and the operation is performed for instantaneous storage, but even if the transistor 8 is instantaneously turned off, the capacitor 9a of the delay circuit 9, which had been charged before that, is discharged. As a result, the transistor 7 remains on, and the switching relay 6 continues to operate. Therefore, even if the above-mentioned erroneous operation occurs when the contact 4a is located at the ON terminal 4b or the small lamp terminal 4d, there will be no inconvenience such as the headlight tilting in the storage direction.

As is clear from the above explanation, the present invention allows the headlight to stop at an ambiguous position even if the switch for opening or retracting the retractable headlight is turned on or off. Since it is designed to prevent such problems, it has the effect of eliminating inconveniences such as deteriorating the appearance of the vehicle body and interfering with light distribution.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of the inventive device, and FIG. 2 is a circuit diagram of a conventional device. 1... Motor, 2... Position sensor, 4... Manual switch for normal operation, 5... Manual switch,
6...Switching relay, 9...Delay circuit.

Claims (1)

[Claims] 1. A manual switch that forces the retractable headlamp to the open position, and a storage and
It has a manual switch for normal operation that performs the opening operation, and the operation of either manual switch energizes the motor that opens or retracts the retractable headlight, and the position sensor that rotates in conjunction with this energizes the motor that opens or retracts the retractable headlight. In a retractable headlamp control device that detects a retracted position and stops the motor, when a manual switch for setting the forced open position is inserted into an instant forced open terminal, the motor is not energized for a certain period of time. Even if the manual switch for normal operation is switched from the instantaneous ON terminal to the OFF terminal, the ON terminal remains in the ON state, and when the ON terminal is switched from the instant OFF terminal, the motor is energized for a certain period of time. A control device for retractable headlights that maintains