JPS5940955A - Control device for retractable head lamp - 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 beam tractor pull headlight, and in particular, it prevents the headlight from stopping at a position other than its proper position even if a manual switch is operated incorrectly. It is something.

Tractor-pull headlights have been proposed, which are in an open position when turned on and retracted into the vehicle body when turned off. For example, some headlights use the power of a motor to store and open the headlights, and when the headlights are in the retracted or open state, the power to the motor is cut off and one of the positions is maintained. It was designed so that

Figure 2 shows the control circuit for a conventional retractable headlamp, so the fi
It has a motor 1 which is the power source of the fl release and storage mechanism, and a position sensor 2 that rotates by 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 open or retracted position of the headlight, the A terminal 4b of the headlight, the OFF terminal 4c, and the small lamp terminal 4.
A manual switch 4 for normal operation has a terminal d 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.

The positioner 2 rotates in conjunction with the motor 1, and has a conductive layer 2a and a conductive layer 2a on its surface.
A headlamp storage position detection part 2b has a part near the center removed to make it a non-conductive part, and a headlamp open position detection part 2C has a part of the outer periphery removed and made a non-conductive part. It is composed. The conductive layer 2a of the position sensor 9-2 has a contact piece 3a' which remains in contact regardless of the rotational position of the position sensor 9-2, and the other end is connected to the relay coil 3a of the relay circuit 3. Then, contact 3b is activated by excitation of relay coil 3a.
Open terminal 3d, J: Switch to power supply terminal 3C and connect motor 1.
The function is to energize the. Furthermore, the conductive layer 2a
, a contact piece 4b' whose one end is connected to the A terminal 4b of the manual switch 4, and a contact piece 4 whose one end is connected to the OFF terminal 4G.
The contact piece /Ib' is located on the outer periphery including the fil-release position detecting section 2C, and the contact piece 4c' is located near the center including the light-off position detecting section 2h.

Therefore, the contact 4a of the manual switch 4 is turned off to the terminal 4C.
When the switch is switched to , the headlight goes out and the contact pieces 4c' and 3a' become energized via the conductive layer 2a, exciting the relay coil 3a. As a result, the contact 3b is switched to the power supply terminal 30, and the motor 1 is driven.

At this time, the position sensors 1 and 2 also rotate, and the storage position IN detection part 2
When b reaches the contact piece 4c', the relay coil 3a is de-energized and the motor 1 is stopped +L. That is, position 1 is a position in which the lactable headlights are turned off and retracted.

When the contact of the manual switch 4 is connected to the ON terminal 4b, the headlight lights up, the contacts 4b' and 3a' are electrically connected, the motor 1 is driven, and the position sensor 2 is rotated. When the open position detection section 2C reaches the contact piece 4b', the power to the motor 1 is cut off and the motor 1 is stopped. In other words, the retractable headlamp is turned on and released (the position sensor 2 is in the position shown in Figure 2).The forced open terminal 5C of the manual switch 5 is connected to the headlamp lighting operation. is a terminal for changing the position from the stored position to the open position.

As explained above, when the manual switch 4.5 is operated normally, operations such as storing the front lights off, opening I & R, or forcing the open are performed without any problems, but for example, when the headlights are turned on for the first time, If the contact 4a of the manual switch 4 is turned on to the instantaneous off terminal 4C due to an erroneous operation while it is open and then turned back on, the motor 1 will be energized at that moment and will rotate slightly, causing the headlights to turn off slightly. Stop when the machine 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. Similarly, contact 4a
This occurs even if the A terminal is set to 4B rather than the OFF terminal 4G.
The headlights will stop slightly open. In addition, this problem can also occur in the manual switch 5 when the contact 5a is momentarily connected to the forced open terminal 5G.

However, when the headlights are stored, they constitute the outer surface of the vehicle body, so if they are in such a state, they may not only look bad, but also may be inadvertently suppressed. If this is applied, the opening/closing mechanism may be deformed and cause failure. Furthermore, although normal light distribution can be obtained at the open position, the normal open position J:
If it is slightly tilted in the storage direction, the desired light distribution cannot be obtained. Of course, if the widths of the storage position detection section 2b and the open position detection section 2C are made sufficiently narrow, even in the case of instantaneous switch operation as described above, each detection section 2b, 2
Although the contact pieces 4b' and 4c' do not stay in the area c, high precision is required for this, and the inertia of the motor itself must also be taken into consideration. As a product, it is not suitable for production as the culm is complicated.

The present invention has been made to deal with such circumstances, and provides a plate control device for a lacticable headlamp that maintains the headlamp in its normal position even when a manual switch is instantaneously activated. It is.

Preferred embodiments of this inventive device will be described below. In addition, the same working members and equivalent parts in the drawings are indicated by -〇- and same- signs.

6 is a signal switching relay for opening or retracting a retractable headlamp (not shown), which includes a relay coil 6a, a contact 6b, a storage terminal 6C, and an opening terminal 6d.
The contact 6b is designed to switch to the open terminal 6d only when the relay coil 6a is energized.

The housing terminal 6C is connected to the contact piece 4c' that is in contact with the circumferential surface of the position sensor +J2 that includes the light-off position detection section 2b, and the open terminal 6d is connected to the circumferential surface that includes the light-on position detection section 2c. It is connected to the touching 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.

A transistor 8 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 by the on operation of the transistor 8.

Reference numeral 9 denotes a delay circuit composed of a capacitor 9a and a resistor 9b, and when any of the manual switches 4.5 that turns the transistor 7 off or on is operated, the headlight is turned off regardless of the operation. It works to keep the light in its normal position.

Next, the operation will be explained.

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

(2) When it is desired to move the headlight from the stowed position to the open position and turn it on (provided that the contact 5a is at the normal terminal 5h), connect the contact 4a of the manual switch 4 to the on terminal 4b.

This turns on the headlights, and at the same time transistor 8,
The transistor 7 is turned on and switched, the relay coil 6a of the input terminal 6 is energized, and the contact 6b is switched to the input terminal 6d. Thereafter, the headlights will reach the open position by the same operation as in (1) above.

Even if the contact 4a is switched to the small lamp terminal 411 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) When it is desired to close 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 is turned off, and transistor 8 is also turned off. Therefore, the contact point 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 energization to the switching relay 3 is stopped 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 contact 5a is instantaneously changed from 5b to 5cm to 5b (
However, the contact 4a is an off terminal 4C. ) This instantaneous operation operates the switching relay 3 through the contact piece 4b' and the contact piece 3a', and the motor 1 is instantaneously driven to move the position sensor 2 to a slightly rotated position, that is, a position where the headlight is slightly opened. However, when the front contact 5a switches to the instantaneous forced open terminal 5c, the capacitor 9a of the delay circuit 9 is charged, and after the contact 5a returns, this discharge current becomes the base current of the transistor 7. Then, the transistor 7 is turned off for a certain period of time, and the switching relay 6 is operated. 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 switching relay 3 is connected to the contact piece 4c' and the contact piece 3a'.
The contact piece 4C' is excited again through the storage position detection part 2.
At point b, the motor 1 stops moving up. In other words,
Even in the event of the above-mentioned erroneous operation, the headlight will always remain in its normal storage position.

(5) When the contact 4a is changed to instantaneous 4C-) 4b-+ 4G or 1lb (or 4d) → 4C → 4b (or 4d) (However, the contact 5a is the normal terminal 5b.) In the former case, the headlight is This is the case when an instantaneous opening operation is performed while the headlights are in the stowed position. It will be held in its normal storage position.

The latter case occurs when the headlights are in the open position and an operation for instantaneous storage is performed, but even if transistors 1 to 8 turn off instantaneously, the delay circuit 9 that was charged before that happens As a result of the discharge of -9a, the 1-transistor resistor 7 maintains the on state, and as a result, the switching relay 6 continues to operate. However, when the -C1 contact 4a is located at the ON terminal 4b or the small lamp terminal 4d, even if the above-mentioned erroneous operation occurs, there will be no inconvenience such as the headlight tilting in the storage direction.

As is clear from the above explanation, even if the switch of the open stowage is mistakenly operated when turning on or off the tractor pull headlight of the present invention, the headlight will stop at an ambiguous position. 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 drawings]

FIG. 1 is a circuit diagram of the 11iff of the present invention, and FIG. 2 is a circuit diagram of a conventional device. 1...Motor, 2...Position adjustment, 4...
- Manual switch for normal operation, 5...manual switch, 6...switching 1 NO, 9...delay circuit. 42

Claims (1)

[Scope of Claims] It has a manual switch that forcibly sets the retractable headlamp to the open position 1n, and a manual switch for normal operation that performs the storage and opening operations associated with turning on and off, and either of the manual switches A motor that opens or retracts a retractable headlamp is energized by operating a switch, and a position sensor that rotates in conjunction with this energizes the motor to detect the open or retracted position and stop the motor. In the control device, when the manual switch for the forced open position is inserted into the instantaneous forced open terminal, the motor is kept energized for a certain period of time, and the manual switch for normal operation is switched from the instantaneous on terminal to the off terminal. In addition, when power is applied to the ON terminal from the momentary OFF terminal, the power to the motor is maintained for a certain period of time. .