JPH06328978A - Control circuit of electric retractable mirror - Google Patents

Abstract

PURPOSE:To eliminate all troubles attributable to the print pattern and the contact point by improving the control circuit of an electric retractable mirror to make the circuit a non-contact. CONSTITUTION:When a storage operating switch or a return operating switch 1b of a switch block A is temporarily closed, the signal voltage is generated and the self hold is made in flip-flop circuit 14a or 14b, and a driving motor M is driven in the normal or reverse direction through a relay means (or a motor drive IC, or a photo-interrupter and a transistor of field effect type). When a mirror reaches the turning stroke end, or the turning of the mirror is prevented by a fault, the current value of the motor M is increased, and the voltage is generated in a motor current detecting resistor 25. This voltage is compared with the reference voltage by a comparator circuit 25, and when the overload of the motor is detected, the flip-flop circuits 14a, 14b are reset.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric circuit for controlling the storing and returning operations of an electric retractable mirror used in, for example, an automobile door mirror.

[0002]

2. Description of the Related Art A door mirror, for example, protrudes to the side of the vehicle body in a normal posture for reflecting the rear view, and therefore becomes an obstacle when passing through a narrow passage or when entering a garage. For this reason, many retractable door mirrors are supported that can tilt forward and backward. 5A and 5B are schematic plan views for explaining the operation of the retractable door mirror. FIG. 5A shows a normal posture that performs an optical function as a door mirror, and FIG. 5B shows the mirror housing tilted rearward. The stored posture is shown, and (C) shows the forward tilted posture, and the upper part of the drawing corresponds to the front of the vehicle body. The mirror base 31 is the vehicle body 30
And the mirror housing 32 is pivotally supported. Although the tilt housing and the standing up / restoring of the mirror housing 32 can be performed by hand, it is troublesome. Therefore, an electrically retractable mirror that can be remotely controlled from the driver's seat has been developed and known. FIG. 6 is an electric circuit diagram showing a known example of a control circuit for an electrically retractable and electrically recoverable door mirror. Reference numeral 33 denotes a pattern switch, which is a sliding contact 3 mounted on the mirror housing while the printed circuit board is fixed to the mirror housing.
4 rotates while sliding on the arc-shaped pattern of the printed circuit board. The radial chain lines shown in the figure represent the respective postures of the mirror housing as noted. The pattern switch 33 has a motor M for driving electric storage and recovery and an overcurrent protection PTC in series, and a storage switch 37.
And a return switch 38 are connected in parallel to each other through a DC power source 39
It is connected to the. The storage switch 37 and the return switch 38 form a reverse switch of a system in which the positive and negative polarities of the DC power source are inverted to supply power to the motor M, and the motor M is normally rotated by manual operation of this switch. , Reversal,
It can be operated freely. Further, the mirror housing is rotated by the rotation of the motor M, and when the mirror housing reaches a desired posture, it is automatically stopped by the action of the pattern switch 33.

[0003]

In the known control circuit shown in FIG. 3, a. Since the sliding contact slides on the mechanical pattern, the pattern switch portion is not sufficiently durable and reliable because it is damaged by wear or causes contact failure due to stains. b. Since the sliding contact mechanism has to be incorporated between the mirror base and the mirror housing, it is spatially cramped and has less design freedom. c. Since a pattern switch corresponding to the size of the rotation stroke angle of the mirror housing must be used, the versatility is poor. d. The pattern switch 33 has a function of detecting an abnormality and automatically stopping even if the mirror housing is rotated by the motor M and is prevented from rotating due to some circumstances (for example, a foreign object is caught). Since there is no motor M
There is a risk of overloading and burning. The present invention has been made in view of the above circumstances, there is no need to incorporate a mechanical switch member between the mirror base and the mirror housing, there is no risk of causing trouble due to wear or foreign matter entrapment, It is an object of the present invention to provide an electric retractable mirror control mechanism having excellent durability and reliability.

[0004]

In order to achieve the above-mentioned object (without using a mechanical pattern switch), a control circuit according to the present invention has a structure in which an electric retractable mirror is retracted,
It is applied to a circuit for controlling a forward / reverse rotation motor that causes return rotation, and its basic structure will be briefly described with reference to FIG. 1 corresponding to an embodiment of the first invention. A retracting operation switch (1a) for opening and closing the energization circuit of the pull-down resistor (2a) that generates a voltage, and a return operation switch (1b) for opening and closing the energization circuit of the pull-down resistor (2b) that generates a signal voltage for return operation. A storage operation flip-flop circuit (14a) having a switch block (A) including means for removing noise of the respective signal voltages and self-holding the storage operation signal and the flip-flop circuit are reset. Means, a reset operation flip-flop circuit (14b) for self-holding the reset operation signal, and means for resetting the flip-flop circuit A relay drive transistor (16a) for current amplifying a signal for storage operation given through the signal control block, and a relay contact for opening and closing a motor circuit by the relay drive transistor. A relay coil (16La) that activates the relay drive transistor, a relay drive transistor (16b) that current-amplifies a signal for return operation given through the signal control block, and a relay contact that opens and closes a motor circuit by the relay drive transistor. A motor drive block (C) including a relay coil (16 Lb) is provided. In addition, referring to FIG. 2 corresponding to the embodiment of the second invention, the point that the basic structure is different from that of the first invention (FIG. 1) will be briefly described.
In order to make S1b, 17S2a, 17S2b) non-contact, a motor drive IC (42) is provided instead. Similarly, in the third invention (FIG. 4),
Photo interrupters (45a, 45b) and field effect transistors (51a, 51a ', 51b, 51b')
Was set up.

[0005]

According to the above construction, by energizing either one of the pair of pull-down resistors, the storage operation signal voltage or the recovery operation signal voltage can be easily obtained.
Each of the stored signal voltage or the return signal voltage generated as described above is noise-removed and given a self-holding function by the flip-flop circuit of the signal control block. The signal is held in a state where it can be extinguished,
In the first invention, the current is amplified by the relay drive transistor, and the motor is operated forward and backward freely via the relay means. In the second invention, the current is amplified by the relay drive transistor and then the current is amplified by the motor drive IC. The motor is operated so that it can rotate forward and backward, and in the third aspect of the present invention, the current is amplified by the photointercoupler, and the motor is operated forward and backward through the field effect transistor, and the motor is retracted or returned to the mirror housing. It can be rotated. If the motor is mechanically locked due to some circumstances (for example, the rotation of the mirror housing reaches the stroke end), an excessive current is generated. Therefore, the signal output that detects the excessive current is output to the flip-flop circuit. By feeding back and eliminating the operation signal of the motor, burnout due to overload of the motor can be prevented.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the control circuit of the present invention will be specifically described with reference to FIG. FIG. 1 is a circuit diagram in which a DC power supply circuit is added to one embodiment of the electric retractable mirror control circuit according to the first invention. The circuit of this embodiment is roughly classified into a switch block A, a signal control block B, a motor drive block C, a sensing block D, and a power supply block E. Next, to briefly describe the role of each block, the switch block A includes a storage operation switch or a return operation switch, and when any one of them is operated, an operation signal is generated, noise is removed, and signal control is performed. Send to block B. The signal control block B causes the flip-flop circuit to self-hold the given storage operation signal or return operation signal in a state where it can be immediately extinguished, and the output signal thereof is output from the motor drive block C.
Give to. The motor drive block C, to which the above-mentioned signal is given, drives the motor M to the positive or negative direction via the relay means depending on whether the given signal is the storage signal or the return signal.
Reverse. The sensing block D automatically checks the operating current value of the motor M and detects an excessive current,
The detection signal output is fed back to the flip-flop circuit of the signal control block B to stop the self-holding of the operation signal, stop the motor M, and prevent the burnout.

Next, the configuration of each of the above blocks will be sequentially described.

Storage operation switch 1 of switch block A
When a is pushed and closed, the pull-down resistor 2a is energized and a signal voltage for storage operation is generated. When the return operation switch 1b of the switch block A is pushed and closed, the pull-down resistor 2b is energized to generate a signal voltage for return operation. The above signal voltage is a pulse voltage. The pulse signal voltage for storage operation is the resistor 3a, the capacitor 4
a, resistor 5a, NOT circuit 6a, and AND circuit 7
By the noise removing means consisting of a, it becomes a noiseless signal for a certain time, which is not affected by the characteristics of the storage operation switch 1a. The pulse signal voltage for return operation is the resistor 3b,
The noise removing means including the capacitor 4b, the resistor 5b, the NOT circuit 6b, and the AND circuit 7b provides a noiseless signal for a certain period of time, which is not affected by the characteristics of the return operation switch 1b. The noise-removed pulse signal voltage for storage operation is sent to the signal control block B, input to the T terminal of the flip-flop circuit 14a, and held by itself. The noise-removed pulse signal voltage for storage operation is sent to the signal control block B, input to the T terminal of the flip-flop circuit 14b, and held by itself. Resistor 8, capacitor 9, resistor 10, and NOT circuit 1
1 indicates both flip-flop circuits 1 when the power is turned on.
4a and 14b are reset to prevent malfunction, and the NOR circuit 12 includes the NOT circuits 11 and N.
By the signal output from the OR circuit 13 or the comparison circuit 22 described in detail later, the flip-flop circuit 14a,
14b is reset. The NOR circuit 13 is connected to the Q terminals of the flip-flop circuits 14a and 14b. O of the flip-flop circuits 14a and 14b
The terminal outputs are sent to the motor drive block C, respectively, and the motor M is rotated forward and backward as described below. The output of the O terminal of the flip-flop circuit 14a for storage operation is converted from voltage to current by the resistor 15a and input to the base of the relay drive transistor 16a,
The current is amplified and the energization of the relay coil 17La is controlled. The relay coil 17La includes relay contacts 17S1a and 17S that are inserted in the operating circuit of the drive motor M.
The opening / closing of S2a is alternately reversed to control the motor operating current. Flip-flop circuit 14b for return operation
The O terminal output of is converted from voltage to current by the resistor 15b, is input to the base of the relay drive transistor 16b, is current-amplified, and controls the energization of the relay coil 17Lb. The relay coil 17Lb is a drive motor M.
Relay contact 17S1b inserted in the operating circuit of
The opening / closing of 17S2b is alternately reversed to control the motor operating current. With the above configuration and operation, when the storage operation switch is temporarily closed, the drive motor M continues to rotate normally even if the switch is subsequently opened. When the return operation switch is temporarily closed, the drive motor M continues to rotate in the reverse direction even if the switch is subsequently opened. The motor M, which is rotating in the normal direction or in the reverse direction as described above, is electrically detected and automatically stopped by the sensing block D described below without using mechanical contacts. First, when the principle is briefly described, when the mirror housing is tilted and turned to a storage posture, or when the mirror housing is raised and rotated (returned) to a normal posture, a stopper (not shown) works to prevent the mirror housing from turning. For this reason, the load of the motor M that drives the rotation increases, and the energization current value increases. The sensing block D of the present embodiment detects the increase in the current and gives a stop signal to the signal control block B described above. Since the automatic stop is performed according to the above-mentioned principle, it is not necessary to install a print pattern or contact points. Further, even if the rotation of the mirror housing is prevented due to some circumstances (for example, entrapment of foreign matter), the automatic stop function works to prevent the motor M from being burned due to overload. The voltage dividing resistors 18, 19 and 20 are connected in series between the positive and negative sides of the power supply voltage. Among the voltage dividing resistors, the voltage dividing resistor 19 is of the type having a variable lead point. Then, a reference voltage is created and input to the comparator circuit 22 via the protection resistor 21. On the other hand, regardless of whether the drive motor M is forward or reverse, the motor current detection resistor 2
5, a current flows downward in the figure, and a positive voltage proportional to the current is generated at the upper end of the motor current detection resistor 25 in the figure. This plus voltage is input to the comparator circuit 22 via the protection resistor 21 '. The comparator circuit 22 outputs a positive power supply voltage if the motor current detection signal voltage is higher than the reference voltage, and outputs a ground potential if it is low. 26 is a motor noise removal capacitor. When the comparator circuit 22 outputs a positive power supply voltage, the output is input to the above-mentioned OR circuit 13 as a reset voltage to reset all circuits. When the drive motor M is normally operated, a large current instantaneously flows as an initial transient phenomenon. Therefore, in order to prevent detection of this instantaneous transient current and resetting of all circuits, a comparator is used. An integrating resistor 23 and an integrating capacitor 24 are provided on the output side of the circuit 22. E in the drawing is a power supply block, which is provided with a three-terminal regulator 27, an input voltage noise removing capacitor 28, and an output voltage noise removing capacitor 29, and is provided in each of the blocks A, B, C, D described above
It supplies a stable DC power supply with no noise.

FIG. 2 is an electric circuit diagram showing one embodiment of the second invention. Embodiment of the first invention described on the left (FIG. 1)
Differences from the above will be described below. The drive transistors 16a and 16b shown in FIG. 2 are similar components corresponding to the drive transistors 16a and 16b in FIG. 1, and their output signals are motor drive IC4.
It is input to the _two inputs IN ₁ and IN ₂ . The v terminal of the motor drive IC 42 is connected to the positive power source, the GND terminal is grounded through the fixed resistor 57, and the motor M is driven according to the output signals of the drive transistors 16a and 16b.
Forward, reverse, stop. A voltage drop proportional to the magnitude of the load current of the motor M occurs in the fixed resistor 57, is compared with the reference voltage in the comparator circuit 23, and when it is excessive, the motor M is stopped via the signal control block B. . Reference numerals 58 and 43 are noise removing capacitors.
The present embodiment (FIG. 2) has no contact except for the operation switches 1a and 1b, and therefore has high operation reliability and excellent durability. FIG. 3 is an improvement of the embodiment of FIG. 2 according to the second invention, in which the power supply block E is omitted and a reverse connection prevention diode 44 is provided. With this improvement, the weight and volume corresponding to the power supply block E can be reduced to one reverse connection diode, and the manufacturing cost can be reduced accordingly.
FIG. 4 is an electric circuit diagram showing one embodiment of the third invention.
Next, the differences will be described in comparison with FIG. 1 which is an embodiment of the first invention. Flip-flop circuit 14a,
The Q terminal of 14b is connected to the drive transistors 16a, 16
Instead of b, it is connected to the cathode terminals of the light emitting diodes of the photo interrupters 45a and 45b, and the anode terminals of the light emitting diodes are plus 12v via fixed resistors 46a and 46b.
Connected to power supply. The photo interrupter 45a,
The collector of the light receiving element 45b has fixed resistors 47a, 47
It is connected to the plus 24v via b, and the emitter is grounded. The signals taken out from the collectors of the photo interrupters 45a and 45b are applied to the field effect transistor 51 via fixed resistors 48a and 48b, respectively.
a, 51b and fixed resistors 53a,
Field effect transistors 51b ', 51 via 53b
a ', which causes the motor M to perform forward, reverse, and stop operations. Reference numeral 52 is a zener diode for protecting the motor M. The field effect transistors 51a and 51b, and the field effect transistors 51b 'and 51a' are respectively connected in series and grounded via a common fixed resistor 59. As a result, a voltage drop proportional to the load current amount of the motor M is generated in the fixed resistor 59, and is compared with the reference voltage in the comparator circuit 22. When the amount of voltage drop is excessive, that is, when the motor M is overloaded, the control block B
The motor M is stopped via. Reference numeral 60 is a noise removing capacitor. As described above, the motor drive block J in this embodiment (FIG. 4) is 24v.
Since a power source and a 12v power source are required, the power source block N
Supplies DC 24v to DC 12v in the following manner. That is, 70 in the figure is a three-terminal regulator, the input side of which is 24v and the output side of which is 12v.
Reference numeral 71 is a noise removing capacitor on the input side, and 72 is a noise removing capacitor on the output side.

[0010]

According to the present invention, by energizing either one of the pair of pull-down resistors, the storage operation signal voltage or the recovery operation signal voltage can be easily obtained. Each of the stored signal voltage or the return signal voltage generated in step (1) is noise-removed, is given a self-holding function by the flip-flop circuit of the signal control block, and can be immediately extinguished in the event of an overload. The signal is held in such a state, and the current is amplified by the relay drive transistor in the first aspect of the invention, and the motor is operated and stopped in the forward and reverse directions via the relay means. In the second aspect, the drive transistor is used. The current is amplified and the motor drive I
Operate and stop the motor forward and backward freely via C,
In the third aspect of the invention, the current is amplified by the photo interrupter, and the motor can be operated forward and backward freely via the field effect transistor to stop, and the mirror housing can be stored or returned. By any chance
If the motor is mechanically locked for some reason, an overcurrent will be generated.Therefore, the signal output that detects the overcurrent is fed back to the flip-flop circuit to eliminate the operation signal of the motor. It has an excellent practical effect of preventing burnout due to load.

[Brief description of drawings]

FIG. 1 is an electric storage mirror control circuit according to a first aspect of the present invention.
It is an electric circuit diagram showing an example.

FIG. 2 is a view showing an electric retractable mirror control circuit according to a second aspect of the present invention.
It is an electric circuit diagram showing an example.

FIG. 3 is a view showing an electric retractable mirror control circuit according to a second invention,
It is an electric circuit diagram which shows an Example different from the above.

FIG. 4 is an electric storage mirror control circuit 1 according to a third invention.
It is an electric circuit diagram showing an example.

5A and 5B are schematic plan views for explaining the operation of the retractable door mirror, in which FIG. 5A shows a normal posture that performs an optical function as a door mirror, and FIG. The tilted storage posture is shown, and (C) shows the front tilt posture, and the upper part of the figure corresponds to the front of the vehicle body.

FIG. 6 is an electric circuit diagram showing a known example of a control circuit for an electrically retractable and electrically recoverable door mirror.

[Explanation of symbols]

1a ... Store operation switch, 1b ... Return operation switch, 2
a ... pull-down resistor for generating stored signal voltage, 2b ... pull-down resistor for generating return signal voltage, 3a, 3b ... integrating resistor,
4a, 4b ... Integrating capacitors, 5a, 5b ... IC protection resistors, 6a, 6b ... NOT circuits, 7a, 7b ... AND circuits, 8 ... Integrating resistors, 9 ... Integrating capacitors, 10 ... Protecting resistors, 11 ... NOT circuits , 12 ... OR circuit, 13 ... NO
R circuit, 14a ... Flip-flop circuit for storing operation, 1
4b ... Flip-flop circuit for restoration operation, 15a, 15
b ... current control resistance, 16a ... storage operation relay drive transistor, 16b ... restoration operation relay drive transistor, 17La, 17LLb ... relay coil, 17
S1a, 17S1b, 17S2a, 17S2b ... relay contact, 18, 19, 20 ... voltage dividing resistance, 21 ... protection resistance,
22 ... Comparator circuit, 23 ... Integrating resistor, 24 ... Integrating capacitor, 25 ... Motor current detecting resistor, 26 ... Motor noise eliminating resistor, 27 ... 3-terminal regulator, 28, 2
9 ... Noise removal capacitor, 30 ... Car body, 31 ... Mirror base, 32 ... Mirror housing, 41a, 41b ... Fixed resistor, 42 ... Motor drive IC, 44 ... Reverse connection prevention diode, 57 ... Fixed resistor, 58 ... Noise removal capacitor, 60 ... 3-terminal regulator, 61, 62 ... Noise removing capacitors, 45a, 45b ... Photo interrupter,
46a, 46b, 47a, 47b, 48a, 48b ... Fixed resistance, 49 ... Variable resistance, 50 ... Fixed resistance, 51a, 5
1a ', 51b, 51b' ... Field-effect transistor,
52 ... Zener diode, 53a, 53b ... Fixed resistor,
54a, 54b ... Photointerrupters, 55a, 55
b, 56a, 56b, 59 ... Fixed resistor, 70 ... 3-terminal regulator, 71, 72 ... Noise removal capacitor.

Claims (10)

[Claims] 1. A circuit for controlling a forward / reverse rotation motor for rotating and retracting an electric retractable mirror, the pull-down resistor (2) generating a signal voltage for retracting operation.
Storage operation switch (1a) for opening and closing the energization circuit of a)
And a return operation switch (1) for opening and closing the energizing circuit of the pull-down resistor (2b) for generating the signal voltage for the return operation.
b) and a flip-flop circuit (14a) for storage operation and a flip-flop circuit (14a) for storing the signal for storage operation, the switch block (A) comprising: A signal control block (B) having means for resetting a circuit, a reset operation flip-flop circuit (14b) for self-holding the reset operation signal, and means for resetting the flip-flop circuit, A relay drive transistor (16a) for current-amplifying a signal for storage operation given via a signal control block and a relay coil (16La) for activating a relay contact for opening and closing a motor circuit by the relay drive transistor.
And a relay drive transistor (16b) for current-amplifying a signal for return operation given through the signal control block, and a relay coil (16Lb) for activating a relay contact for opening and closing a motor circuit by the relay drive transistor. An electric retractable mirror control circuit comprising a motor drive block (C). 2. A fixed resistor (25) for detecting an operating current of the motor and a voltage drop amount generated in the fixed resistor are automatically measured and fed back to the signal control block (B). And a sensing block (D) composed of a voltage dividing resistor for applying a reference voltage to the comparator circuit, and when the motor is locked and the operating current increases 2. The electric retractable mirror control circuit according to claim 1, wherein the amount of voltage drop of the motor is increased to stop the energization of the motor. 3. A power supply block E comprising a three-terminal regulator (27), an input voltage noise elimination capacitor (28), and an output voltage noise elimination capacitor (29). The electric retractable mirror control circuit described in 1. 4. A pull-down resistor (2) for generating a signal voltage for retracting operation, which is a circuit for controlling a motor capable of forward and reverse rotation for rotating and retracting an electric retractable mirror.
Storage operation switch (1a) for opening and closing the energization circuit of a)
And a return operation switch (1) for opening and closing the energizing circuit of the pull-down resistor (2b) for generating the signal voltage for the return operation.
b) and a flip-flop circuit (14a) for storage operation and a flip-flop circuit (14a) for storing the signal for storage operation, the switch block (A) comprising: A signal control block (B) having means for resetting a circuit, a reset operation flip-flop circuit (14b) for self-holding the reset operation signal, and means for resetting the flip-flop circuit, A pair of relay drive transistors (16a, 16a) for current-amplifying the signal for storage operation given through the signal control block.
Motor drive IC that opens and closes the motor circuit by b)
An electric retractable mirror control circuit comprising a motor drive block (F) consisting of (42). 5. The GN of the motor drive IC (42)
A fixed resistor (57) connected between the D terminal and ground to produce a voltage drop proportional to the operating current of the motor,
And a comparator circuit (22) for automatically measuring the amount of voltage drop generated in the fixed resistor (57) and feeding it back to the signal control block (B), and a voltage divider for giving a reference voltage to the comparator circuit. The electric retractable mirror control circuit according to claim 4, further comprising a sensing block (G) including a resistor. 6. Three terminals for lowering the voltage of a DC power supply to a predetermined voltage and supplying the voltage to the switch block (A), signal control block (B), motor drive block (F) and sensing block (G). Regulator (6
0) A power retractable mirror control circuit according to claim 4, characterized in that it comprises a power supply block (L). 7. A DC power source, a switch block (A),
The diode (44) connected between the signal control block (B), the motor drive block (F) and the sensing block (G) to prevent reverse connection, is characterized in that it has a diode (44). The described electric retractable mirror control circuit. 8. A pull-down resistor (2) for generating a signal voltage for a retracting operation, which is a circuit for controlling a motor capable of forward and reverse rotation for rotating and retracting an electric retractable mirror.
Storage operation switch (1a) for opening and closing the energization circuit of a)
And a return operation switch (1) for opening and closing the energizing circuit of the pull-down resistor (2b) for generating the signal voltage for the return operation.
b) and a flip-flop circuit (14a) for storage operation and a flip-flop circuit (14a) for storing the signal for storage operation, the switch block (A) comprising: A signal control block (B) having means for resetting a circuit, a reset operation flip-flop circuit (14b) for self-holding the reset operation signal, and means for resetting the flip-flop circuit, A pair of photo-interrupters (45a, 45b) for current-amplifying a signal for storage operation given through the signal control block, and a plurality of field-effect transistors (for opening and closing a motor circuit according to output signals of the photo-interrupters ( 51a, 5
An electric retractable mirror control circuit comprising a motor drive block (J) consisting of 1b). 9. The field effect transistor (51a,
A fixed resistor (59) connected between the source of 51b) and the ground to cause a voltage drop proportional to the operating current of the motor, and the amount of voltage drop generated in the resistor (59) are automatically Measure the signal control block (B)
9. The electric retractable mirror according to claim 8, further comprising a comparator circuit (22) for feeding back to the sensor circuit and a sensing block (K) including a voltage dividing resistor for applying a reference voltage to the comparator circuit. Control circuit. 10. The photo interrupter (45a, 4)
5b) is operated by being supplied with two kinds of high and low DC voltages, and lowers the power supply voltage corresponding to the above high voltage for the photo interrupter to the same low voltage.
Terminal regulator (70), input side noise removal capacitor (71), output side noise removal capacitor (72)
The electric retractable mirror control circuit according to claim 8, further comprising a power supply block (N) including