JPH0417395Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention is an electric retractable mirror equipped with a motor and gears for rotating a mirror rotatably attached to the body of a vehicle from a set position to a retracted position. This invention relates to a control circuit for a mirror.

(b) Prior art The control circuit for conventional electrically retractable mirrors was developed by
As described in Japanese Patent No. 60-215444, a timer circuit was provided to turn on a relay circuit and operate a motor only for the time required to drive the mirror. As a result, storage and setting of the mirror was controlled by time using a timer circuit.

(c) Problems to be solved by the invention The above-mentioned conventional technology had a problem in that the number of parts increased.

Furthermore, even if the mirror storage and setting operations, that is, mirror rotation, are blocked by an external force, the timer circuit will not stop operating, so the mirror will stop before the rotation is completed. I had a problem with it.

(d) Means for solving the problem The purpose of the present invention is to provide a control circuit for an electric retractable mirror that has a simple configuration and is resistant to disturbances caused by external forces. a relay that operates to rotate the motor in a desired direction in response to input from the switch, and a self-holding reed switch that operates by energizing the motor through relay operation;
It is characterized by comprising a sliding contact that is connected in series with the motor and regulates the direction of energization to the motor at the retracted and set positions.

(e) Examples Examples of the present invention will be described below based on the drawings.

FIG. 1 is a diagram showing the configuration of a control circuit according to an embodiment of the present invention.

Reference numeral 2 designates a switch for inputting command signals for storing and setting, and its contact 2a is connected to the battery BAT, and by bringing this contact 2a into contact with contacts 2b and 2c, respectively, setting and storing command signals are input from contacts 2b and 2c. Each command signal is output.

4 is a first relay, and 6 is a second relay, and the state in which the contacts 4b, 4c, 6b, and 6c are normally in contact is changed to the state in which the contacts 4b, 4d, 6b, and 6d are in contact due to the electromagnetic action of the coils 4a and 6a, respectively. It changes the state.

The coils 4a, 6a have one end connected to the contacts 2b, 2c of the switch 2, respectively, and the other end grounded. Further, the contacts 4c and 6c are grounded.

8 is a first reed switch, and 10 is a second reed switch.

The first reed switch 8 is a coil 8a provided between the battery BAT and the contact 4d of the first relay 4.
and a switch 8b which is turned on by its electromagnetic action and is provided between the battery BAT and the coil 4a of the first relay 4. Further, the second reed switch 10 is turned on by the electromagnetic action of a coil 10a provided between the battery BAT and the contact 6b of the second relay 6, and the coil 10a provided between the battery BAT and the contact 6b of the second relay 6 is turned on. and a switch 10b provided between the two.

12 is a motor for the right mirror, and 14 is a motor for the left mirror.

16 and 18 are sliding contacts, as shown in Fig. 2 A to C.
As shown in FIG. 2, it is composed of a rotary plate 20 that rotates as the motors 12 and 14 rotate, and contacts A, B, and C that contact the surface of the rotary plate 20.

The surface 20a of this rotary plate 20 is made of a conductor, and the black portions 20b and 20c in the figure are made of an insulator. These sliding contacts 16 and 18 are such that when the mirror is set, contact A contacts the insulator 20b and contacts B and
C is set to be conductive, and when the mirror is in the retracted state, contact B is set to contact insulator 20c as shown in FIG. 2C, and contacts A and C are set to be conductive. ing. Further, when the mirror is in operation, contacts A, B, and C are all set to be in a conductive state, as shown in FIG. 2B.

22 and 24 are the respective sliding contacts 1 from the first relay 4.
6 and 18 are diodes that conduct current in the direction of contact A, and 26 and 28 are contact B of each sliding contact 16 and 18.
This is a diode that allows current to pass in the direction from the first relay 4 to the first relay 4.

Next, the operation of the circuit having the above configuration will be explained. First, in order to store the mirror in the set state, it is necessary to operate the switch 2 to make the contacts 2a and 2c conductive.

By this operation, a current flows through the coil 6a of the second relay 6, and the contacts 6b and 6d of the second relay 6 come into contact with each other due to the electromagnetic action.

At this time, the sliding contacts 16 and 18 are in a state where their contacts B and C are electrically connected via the rotary plate 20, as shown in FIG. 2A. For this reason, the motor 12 includes a battery BAT-coil 10a (reed switch 10).
- Contacts 6d, 6b (second relay 6) - Motor 12 -
A current is applied through the path of contacts C and B (sliding contacts 16), contacts 4b and 4c (second relay 4), and ground GND to operate.

At the same time, the battery is also connected to the motor 14.
BAT-coil 10a (second reed switch 10)
-Contacts 6d, 6b (second relay 6) -Motor 14-
A current is applied through the path of contacts C and B (sliding contacts 18), contacts 4b and 4c (second relay 4), and ground GND to operate.

When current flows through the coil 10a of the second reed switch 10 in this manner, the switch 10b is turned on due to its electromagnetic action, and the battery BAT is connected to the coil 6a of the second relay 6.

Therefore, even if the switch 2 is returned to the neutral off state, the contacts 6b and 6d of the second relay 6 will remain in contact, and the second reed switch 10 will also be kept in the on state. Become.

When the motors 12 and 14 operate in this manner and the mirror begins to rotate, the rotating plates 20 of each sliding contact 16 and 18 also rotate in the direction of arrow 30 in FIG. 20b, contacts A, B, and C are all conductive as shown in FIG. 2B.

Thereafter, when the mirror comes to the set position, the sliding contacts 16 and 18, as shown in FIG. 2C, contact B contacts the insulator 20c, and no current flows from contact C to contact B. Therefore, the motor 12,
14 stops.

Furthermore, the coil 10 of the second reed switch 10
Since the current supply to a is also cut off, the switch 10b
returns to the OFF state, thereby cutting off the current supply to the coil 6a, the contact state of the contacts 6b and 6d is released, and the contact state of the contacts 6b and 6c is switched again.

Next, when the contact 2a of the switch 2 is brought into contact with the contact 2b, a current is applied to the coil 4a of the first relay 4, and the contact 4b and the contact 4d are brought into contact by the electromagnetic action.

At this time, contacts A and C of the sliding contact 16 are in a conductive state as shown in FIG. 2C.

Therefore, the motor 12 includes battery BAT, coil 8a (first reed switch 8), and contacts 4d and 4b.
(1st relay 4) - Contacts A, C (sliding contacts 16) - Motor 12 - Contacts 6b, 6c (2nd relay 6) - Ground
It is activated by applying a current through the GND path.
Similarly, for the motor 14, the battery BAT-coil 8a (first reed switch 8)-contacts 4d, 4
b (first relay 4) - contacts A, C (sliding contact 18) -
A current is applied through the path of the motor 14 - contacts 6b, 6c (second relay 6) - ground GND to operate. In this way, when current flows through the coil 8a of the first reed switch 8, the switch 8b is turned on due to its electromagnetic action, and the battery BAT is connected to the coil 4a of the first relay 4.

Therefore, even if switch 2 is turned off,
The contact state of contacts 4b and 4d of the first relay 4 is maintained, and thereby the on state of the first reed switch 8 is also maintained.

In this way, a current is applied to the motors 12 and 14 in the opposite direction to that during the retracting operation described above, and the motors 12 and 14 rotate in the opposite direction to that during the retracting operation.

Therefore, the rotating plates 20 of the sliding contacts 16, 18 shown in FIG.
When the contact point A is released from contact with the insulator 20b and the mirror comes to the set position, the contact point A comes into contact with the insulator 20b as shown in FIG. 2A. For this reason, contact A
Current no longer flows from to contact C, and motors 12 and 14 stop.

When the current stops flowing in this manner, the switch 8b of the first reed switch 8 returns to the OFF state, and thereby the first relay 4 also returns to the state in which the contacts 4b and 4c are in contact with each other.

In this way, in this embodiment, the rotation of the mirror is not controlled by the time required for the rotation;
Control is performed by using sliding contacts and changing the contact state of the contacts depending on the position of the mirror.

(f) Effects of the invention According to the invention, when the motor rotates and the mirror is set or stored in a predetermined position, the self-maintaining reed switch or relay can be immediately turned off, ensuring reliable operation. It can be activated and stopped.

Further, the number of parts can be reduced, and the number of assembly steps can also be reduced.

Further, even if the operation of the mirror is prevented by an external force while the mirror is in operation, the mirror can be completely set or retracted.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of a control circuit according to an embodiment of the present invention, and FIGS. 2A to 2C are diagrams showing the configuration and operation of the sliding contact shown in FIG. 1. 2...Switch, 4...1st relay, 6...2nd relay, 8...1st reed switch, 10...
2nd reed switch, 12, 14...Motor, 1
6, 18...Sliding contact.

Claims (1)

[Scope of Claim for Utility Model Registration] A control circuit for an electric retractable mirror equipped with a motor and gears for rotating a mirror rotatably attached to the body of a vehicle from a set position to a retracted position. A switch for inputting a command signal, a relay that operates to rotate the motor in a desired direction in response to input from this switch, and a self-holding reed switch that operates by energizing the motor through relay operation. A control circuit for an electrically retractable mirror, comprising: a sliding contact connected in series with the motor and regulating the direction of energization to the motor at the retracted and set positions.