JPH0687076U - Electric folding door mirror drive circuit - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To provide a drive circuit for an electric folding door mirror that can always stop the mirror body at a fixed position. [Structure] Operation switch 3 for selecting the polarity of the power supply circuit to the motor 1 to raise or lower the mirror body
a, 3b, an upright position detection switch 6 that cuts off power supply when the door mirror is rotated to the upright position, a fall position detection switch 12 that cuts off power supply when the door mirror is rotated to the down position, and a door mirror. And a means for short-circuiting both ends of the motor when returning to the standing position.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a drive circuit for an electric foldable door mirror that can be erected and fallen down by driving a motor.

[0002]

[Prior art]

 As shown in FIG. 9, when the conventional electric retractable door mirror is closed to the N side (upright side) or the B side (collapsed side) of the manual switch 23, a current having a polarity corresponding thereto flows to the motor 21 and the mirror body. When the mirror body reaches an upright position or a rearward inclining position, the upright position detecting switch 26 or the down position detecting switch 23 is opened to shut off the power supply to the motor 21.

[0003]

[Problems to be solved by the device]

 However, in such a conventional electric folding door mirror, when the mirror body reaches the upright position, the mirror body is stopped by simply cutting off the power supply to the motor 21. For this reason, even if electric tiltable mirrors of the same standard are used, due to variations peculiar to the motors 21, 21, ... Or variations in gears for transmitting the driving force of the motors 21, 21 ,. The time from when the power supply to the motors 21, 21, ... Is cut off until the mirror body is completely stopped varies, and the standing / stopping position of the mirror body is not uniform for each product. Even for a single product, the standing and stopping position of the mirror body may change due to external factors such as fluctuations in power supply voltage and fluctuations in ambient conditions such as temperature. In addition, there was a problem that the field of view at the standing up position changed when the mirror body was laid down in the garage in the evening and raised from the garage the next morning.

The present invention solves the above-mentioned problems of the prior art and provides a drive circuit for an electric tiltable door mirror that can always stop at a fixed standing position when a door mirror, that is, a mirror body is raised. With the goal.

[0005]

[Means for solving problems]

 In order to achieve the above object, the present invention provides means for cutting off the power supply to the motor and short-circuiting both ends of the motor when the door mirror stands up and returns to the standing position. That is, in the electric retractable door mirror in which the mirror body is assembled to the mounting base at the rotating shaft portion and is rotated to the standing or fall position by driving the motor in the mirror body, the polarity of the power supply circuit to the motor To switch the mirror body up or down, an upright position detection switch that shuts off power supply when the door mirror is rotated to the upright position, and a power supply when the door mirror is rotated to the down position. And a means for short-circuiting both ends of the motor when the door mirror returns to the standing position.The detection switch is mounted on the mounting base or the mirror body at the rotating shaft portion of the mirror body. An arc-shaped conductor provided on one of the above and a plurality of contact pieces provided on the other, The short-circuiting means is connected in parallel with the motor and has a short-circuiting circuit provided with a diode for blocking a current in the reverse direction, and a power supply circuit to the motor is opened in response to the return of the standing position of the door mirror. After that, the contact piece for closing the short circuit is included, and the contact piece for the standing position detection switch and the contact piece for closing the short circuit are the same.

[0006]

[Action]

 When the door mirror is returned to the predetermined upright position by driving the motor, the motor is instantaneously stopped by the dynamic braking, so that the door mirror is stably and reliably stopped without being displaced from the predetermined upright position.

[0007]

【Example】

An embodiment of the present invention shown in the drawings will be described below. The illustrated example is applied to a door mirror on the right side of an automobile . FIG. 1 is a circuit diagram and FIG. 2 is a plan view of an upright position detecting switch and a fall position detecting switch. In FIG. 1 , 1 is an electric folding door mirror, that is, a motor 2 for raising and lowering its mirror body is a DC power source, 3a and 3b are manual switches connected in parallel to the DC power source 2 and linked to each other, and 4 is a manual switch 3a. A posistor 5 for protecting the circuit including the motor 1 connected between the COM terminals of 3b is a diode for supplying a current when the mirror body is raised from the rearward tilted position to the standing position. When a positive power supply is applied to the N terminal and a negative power supply is applied to the B terminal, the motor 1 drives the mirror body in a direction to erect from the rearward tilted position to the upright position, and also to the B terminal. When a power source is applied and a negative power source is applied to the N terminal, the mirror body is driven to fall from the upright position to the rearward tilted position.

Further, in FIG. 1 , 6 is connected to the terminal 7 when the mirror body is in the rearward tilted position and between the rearward tilted position and the standing position, and is connected to the terminal 8 when the mirror body is in the standing position. This is a standing position detection switch. A short circuit 9 connects the terminal 8 and the B terminal of the motor 1. The short circuit 9 includes a diode 10 for preventing backflow. Reference numeral 11 is a diode that supplies a current when the mirror body is laid down from the upright position (or the forward tilt position) toward the rear tilt position, and 12 is the mirror body in the forward tilt position and between the forward tilt position and the rear tilt position (the upright position). This is a fall position detection switch that is connected to the terminal 7 when it is in the position (including the position) and is separated from the terminal 7 when the mirror body is in the rear tilt position.

As shown in FIG. 2 , the standing position detection switch 6, the terminals 7 and 8 and the fall position detection switch 12 are provided on the contact pieces 13, 14, 15, 16 provided on the rotating shaft portion of the mirror body. It is composed of each contact. The contacts of the switches 6 and 12 and the terminals 7 and 8 (these switches and terminals are simply referred to as contacts hereafter unless they interfere with each other in operation) are provided on the mounting base in the rotating shaft portion of the mirror body. The conductors 17 and 18 are in contact with the surfaces of the arc-shaped conductors 17 and 18, and slide on the conductors 17 and 18 as the mirror body rotates with respect to the mounting base. The conductor 17 is formed such that a full width portion having a predetermined width in the radial direction and an outer portion having a width of about half from one end of the full width portion toward the outer circumference are formed in a continuous arc shape having a central angle of about 280 ° C. . Further, the conductor 18 is formed in an arc shape having a central angle of about 90 ° C., which extends from the other end of the entire width portion of the conductor 17 toward the inner periphery with a gap and extends over the inner portion having a width of about half.

The contact pieces 13, 14, 15, 16 are all formed in the same shape, and when they are attached to the mirror body at 90 ° intervals, the contact points 6, 7, 8, 12 are connected to the conductors 17 in the mounting direction. , 18 corresponding to the inner portion or the outer portion of the conductor 17 can be selected. The contact pieces 13, 15 are mounted such that the contacts 6, 8 are oriented corresponding to the inner portions of the conductors 17, 18, while the contact pieces 14, 16 are mounted such that the contacts 7, 12 are oriented corresponding to the outer portions of the conductor 17. ing. FIG. 2 shows the positions of the contact pieces 13, 14, 15, 16 when the door mirror is in the upright position.

Next, the operation of the above device will be described. First, when the mirror body is in the rear tilted position, the contacts 6, 7, 8, 12 are in the positions shown in FIG. 3 , so that the standing position detection switch 6 is connected to the terminal 7 via the conductor 17 and is in the fall position . The detection switch 12 is located outside the conductor 17 and is separated from the terminal 7. When the manual switches 3a, 3b are closed to the N side (standing side) in this state, the manual switch 3a, the posistor 4, the diode 5, the terminal 7, the standing position detection switch contact point 6, the motor 6 Since a current flows to the minus side through the 1 and the manual switch 3b in sequence, the motor 1 is driven to raise the mirror body toward the upright position. The contacts 6, 7, 8 and 12 during the upright rotation are in the state shown in FIG. 4, and the fall position detection switch 12 is connected to the terminal 7 via the conductor 17, but the upright position detection switch 6 connects the conductor 17 to the terminal 7. The motor 1 continues to be driven in the same direction because it is continuously connected to the terminal 7 via the motor.

When the mirror body reaches the standing position, the contacts 6, 7, 8 and 12 are in the positions shown in FIG. 5 , and the standing position detection switch 6 is separated from the conductor 17 and separated from the terminal 7, and then the conductor 18 is continued. It is connected to the terminal 8 via. Therefore, the standing position detection switch 6 shuts off the power supply to the motor 1 by separating it from the terminal 7, and closes the short circuit 9 by connecting it to the terminal 8. At the time when the power supply is cut off, the positive electricity and the negative electricity generated at the N terminal and the B terminal of the motor 1 are connected to the closing circuit 9 of the short circuit 9 from the N terminal of the motor 1 to the standing position detection switch 6 and the end. Since the current flows to the B terminal of the motor 1 via the child 8 and the diode 10 in sequence, the motor 1 is stopped by braking due to dynamic braking, and as a result, when the mirror body reaches the upright position, it does not shift from that position and is sure to move. Stop at the standing position.

When the manual switches 3a and 3b are closed to the B side while the mirror body is in the upright position, the manual switch 3b, the motor 1, the diode 11, the terminal 7, the fall position detecting switch are inserted from the positive side of the power source 2. Since a current flows to the minus side through the 12, the posistor 4 and the manual switch 3a in this order, the motor 1 is driven in the reverse direction and the mirror body is laid down to the rearward tilted position. The contacts 6, 7, 8, 12 in the fall movement are in the state shown in FIG. 4 , and the standing position detection switch 6 is connected to the terminal 7 via the conductor 17, but the fall position detection switch 12 is connected via the conductor 17. The motor 1 continues to be driven in the same direction because the connection with the terminal 7 is continued. When the mirror body reaches the rearward tilted position, the contacts 6, 7, 8, 12 become the positions shown in FIG. 3 , and the fallen position detection switch 12 is separated from the conductor 17 and separated from the terminal 7, so that power is supplied to the motor 1. As a result, the motor 1 is stopped and the mirror body is stopped in the rearward tilted position.

Further, when the mirror body is in the forward tilted position by the manual operation, the contacts 6, 7, 8 and 12 are at the positions shown in FIG. 6 , and the standing position detection switch 6 has both terminals 7 and 8. Although not connected, the fall position detection switch 12 is connected to the terminal 7 via the conductor 17. Therefore, when the manual switches 3a, 3b are closed to the B side, the motor 1 is driven in the same direction as when the manual switch 3a, 3b is laid down from the upright position to the rearward tilted position. It moves to the tilted position and stops at the back tilted position.

FIG . 7 shows another embodiment of the present invention applied to the right side door mirror 41R and the left side door mirror 41L of an automobile. Both door mirrors 41R and 41L are the same as those in FIG. 1, and the same parts as those in FIG. 1 are designated by the same reference numerals, and those reference numerals are denoted by R meaning right side and L meaning left side, respectively. Is shown. 42 is a single-pole double-throw self-returning operation switch that is connected to either the N terminal or the B terminal by manual operation and returns to the standing position shown in the figure when the hand is released. It is Ji. Reference numeral 43 denotes a controller that selects a polarity by one-touch operation of the operation switch 42 and supplies power to at least one of the right side door mirror 41R and the left side door mirror 41L for a certain time. Also, 44 is connected to the output of the controller 43 and transmits the output of the controller 43 only to the right side door mirror 41R when it is located on the R terminal side, and when it is located on the L terminal side, it is connected to the left side door mirror 41L only. Both door mirrors 41R and 41L are R / L changeover switches that transmit the output and transmit the output of the controller 43 when in the standing position shown in the figure.

When the operation switch 42 is connected to the N side, the controller 43 is set in advance for a set time (slightly longer than the time required for the door mirrors 41R and 41L to stand up from the rearward tilted position to the standing position). The output terminal N is set to the “H” level until the specified time elapses, and when the operation switch 42 is connected to the B side, the set time (the door mirrors 41R and 41L fall to the rearward tilted position) from the connection point. The timer circuit 45 keeps the output terminal B at the “H” level until a preset time slightly longer than the time required for the elapse. The timer circuit 45 replaces the output terminal N when the operation switch 42 is connected to the B side (or the N side) while the output terminal N (or B) is set at the “H” level. B (or the output terminal N instead of the output terminal B) is set to the “H” level for the set time, or both the output terminals N and B are set to the “L” level.

The controller 43 also causes the relay XN that continues to be excited by the transistor 46 conducting while the output terminal N of the timer circuit 45 is at “H” level and the output terminal B of the timer circuit 45 to be at “H” level. The relay XB continues to be excited while the transistor 47 is conducting during the period. The contacts xN and xB of the relays XN and XB are both connected to the terminal b shown in the figure when the relays XN and XB are in the non-excited state, and to the terminal a while the relays XN and XB are in the excited state. It is supposed to be done. The COM terminals of the contacts xN and XB form two output terminals of the controller 43 shared by both door mirrors 41R and 41L.

Next, the operation of the apparatus shown in FIG. 7 will be described. First, when the right side door mirror 41 R and the left side door mirror 41 L are both in the rearward tilted position, the operation switch 42 is operated by one-touch operation to the N side with the R / L switching switch 44 in the upright position shown in the figure. The output terminal N of the circuit 45 becomes "H" level, the transistor 46 becomes conductive, the relay XN is excited, and the contact xN is switched to the a terminal side. As a result, from the power supply + B, the a terminal of the contact xN, the contact xN, the COM terminal of the contact xN, the R / L changeover switch 44, the R and L terminals of the R / L changeover switch 44, the diodes 5R and 5L, the terminals 7R and 7L. , The standing position detection switches 6R and 6L, the motors 1R and 1L, the COM terminal of the contact point xB, the contact point xB, and the b terminal of the contact point xB, the electric current flows to the ground side in sequence, so that the motors 1R and 1L are driven respectively. The door mirrors 41 R and 41 L are erected toward the erected position.

When the door mirrors 41R and 41L reach the standing position, the motors 1R and 1L perform dynamic braking similarly to those in FIGS. 1 to 6 , and the door mirrors 41R and 41L surely stop in the standing position. After that, when the set time of the timer circuit 45 elapses, the output terminal N 1 becomes “L” level, the transistor 46 is cut off, the relay XN is demagnetized, and the contact x N is switched to the b terminal side. By positioning the R / L changeover switch 44 on the R terminal side or the L terminal side, it is possible to raise only one of the right door mirror 41R and the left door mirror 41L from the rearward tilted position to the standing position.

When both door mirrors 41R and 41L are in the upright position, if the operation switch 42 is one-touch operated to the B side with the R / L switch 44 in the upright position shown in the figure, the timer circuit The output terminal B of 45 becomes "H" level, the transistor 47 becomes conductive, the relay XB is excited, and the contact xB is switched to the a terminal side. As a result, the R / L changeover switch 44, the COM terminal of the contact xN, the contact xN, the contact xN, the contact xN, the contact xB, the contact xB, the contact xB, the COM terminal of the contact xB, and the contact xN, the contact xN, and the b Since a current flows to the ground side through the terminals in sequence, the motors 1R and 1L are driven in the opposite directions, and the respective door mirrors 41R and 41L are laid down toward the rearward tilted position.

When the respective door mirrors 41R, 41L reach the rearward tilted position, the motors 1R, 1L are stopped and the respective door mirrors 41R, 41L are stopped at the rearward tilted position, as in FIGS. When the set time of the timer circuit 45 elapses, the output terminal B becomes "L" level, the transistor 47 is cut off, the relay XB is demagnetized, and the contact xB is switched to the b terminal side. By arranging the R / L changeover switch 44 on the R terminal side or the L terminal side, only one of the right door mirror 41R and the left door mirror 41L can be laid down from the upright position to the rearward tilted position.

Therefore, the circuit of the embodiment shown in FIG. 7 requires two in the right side door mirror and two in the left side door mirror in order to dynamically brake the motor by one-touch operation of the switch in the conventional one of this kind. It requires a total of four relays and four lead wires for each door mirror, and two lead wires for each door mirror, while two lead wires for each door mirror. Since this is enough, it is possible to reduce the space and cost.

[0023] Figure 8 shows a modification of the main part of that of Figure 7, instead of the operation switch 42 in FIG. 7, and closed between the contacts by a manual operation, between the contacts back to the position of the shown release the hand The single-pole single-throw, self-resetting operating switch 52 that opens is used, and the timer circuit 55 has a one-touch operation that allows the operating switch 52 to operate while the output terminal N (or B) is set to the "H" level. Then, the output terminal B instead of the output terminal N (or the output terminal N instead of the output terminal B) is set to the “H” level for a set time, or both the output terminals N and B are both set to the “L” level. It is supposed to be a level. Even if the operation switch 52 and the timer circuit 55 are used, if the others are configured in the same manner as in FIG. 7 , the same operation as in FIG. 7 is performed.

Although the contacts 6, 7, 8, 12 are provided on the mirror body and the conductors 17, 18 are provided on the mounting base in the above embodiment, for example, the contacts 6, 7, 8, 12 are provided on the mounting base. The conductors 17 and 18 may be provided on the mirror body. Further, the shapes of the contact pieces 13, 14, 15, 16 and the conductors 17, 18 are not limited to those shown in the figures, and the standing position detection switch 6, the terminal 7 may be formed by other than the contact points of the contact pieces 13, 14, 15, 16. , 8 and the fall position detecting switch 12 may be configured.

[0025]

[Effect of device]

 Since the present invention is configured as described above, when the door mirror is returned to a predetermined standing position by driving the motor, the motor is instantaneously stopped by dynamic braking, and thereby the door mirror is always reliably stopped at the certain standing position. Therefore, even if there are variations unique to the motor, variations in gears, etc., the standing and stopping positions of the door mirrors do not become uneven for each product. In addition, the neutral stop position does not change from the standing position before the fall even if there is a change in the power supply voltage, temperature, or other ambient conditions, so that it does not change during manufacturing, mounting, or use. In addition to being suitable, it has excellent effects such as high safety because the field of view of the door mirror does not change between the standing position before falling down and the standing up position after falling down during use. Since the contact piece that opens the circuit and the contact piece that closes the short circuit are separate, the short circuit is closed before the power supply circuit is opened due to misalignment of their mounting positions, etc., causing the circuit to burn out. Although there was a fear, in this invention, the contact piece that opens the power supply circuit and the contact piece that closes the short circuit are the same, so there is also a unique effect that there is no such fear. It is to shall.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

2 is a schematic arrangement diagram showing the planar arrangement of such standing position detection switch and the laid posture detecting switch of that of FIG.

3 is an explanatory diagram showing the contact position when de amylase i.e. the mirror body is in the post-tilted position.

[4] de amylase or mirror body the rear losses - is an explanatory view showing a contact position when in the upright position between.

[5] de amylase or mirror body is an explanatory view showing a contact position when in the standing position.

6 is an explanatory view showing the contact position when de amylase i.e. the mirror body is in the forward-tilted position.

FIG. 7 is a circuit diagram showing another embodiment.

8 is a diagram showing a modification of a main part of FIG.

9 is a circuit diagram showing an example of the traditional ones.

[Explanation of symbols]

 1 Motor 2 DC power supply 3a, 3b Manual switch 4 Posister 5, 10, 11 Diode 6 Standing position detection switch (contact) 7, 8 Terminal (contact) 12 Falling position detection switch (contact) 13, 14, 15, 16 Contact piece 17, 18 conductor 41R right side door mirror 41L left side door mirror 42, 52 operation switch 43 controller 44 R / L changeover switch 45, 55 timer circuit 46, 47 transistor XN, XB relay xN, xB contact

Claims (10)

[Scope of utility model registration request] 1. An electric retractable door mirror in which a mirror body is assembled to a mounting base at a rotating shaft portion and is rotated to an upright or fallen position by driving a motor in the mirror body, wherein a power supply circuit for the motor is provided. An operation switch that raises or lowers the mirror body by selecting the polarity of, a standing position detection switch that shuts off power supply when the door mirror is turned to the standing position, and a door mirror is turned to the lying position. A fall position detection switch that shuts off power supply, and a means that short-circuits both ends of the motor when the door mirror returns to an upright position.The detection switch is a mounting base in a rotating shaft portion of a mirror body, or An arc-shaped conductor provided on one of the mirror bodies and a plurality of contact pieces provided on the other, The short-circuiting means is connected in parallel with the motor and has a short-circuiting circuit having a diode for blocking a reverse current, and after opening the power supply circuit to the motor in response to the return of the standing position of the door mirror, the circuit is opened. A contact piece for closing the short circuit, and a contact piece for the standing position detection switch and a contact piece for closing the short circuit are the same. 2. The electric retractable door mirror according to claim 1, wherein the drive circuit includes a controller that selects a polarity by one-touch operation of an operation switch and supplies power to the motor for a certain period of time. Drive circuit. 3. The drive circuit for an electric tiltable door mirror according to claim 2, wherein the controller has two output terminals shared by the right door mirror and the left door mirror. 4. The electric folding door mirror according to claim 3, wherein at least one of the both output terminals is provided with a changeover switch for selecting one or both of the right side door mirror and the left side door mirror. Drive circuit. 5. The drive circuit for an electric foldable door mirror according to claim 2, wherein the operation switch is a single-pole double-throw self-return switch. 6. The electric tiltable device according to claim 5, wherein the controller includes a timer circuit that reverses the output polarity of the controller when the operation switch is operated to the opposite polarity during operation. Door mirror drive circuit. 7. The electric folding mirror as claimed in claim 5, wherein the controller includes a timer circuit that stops the operation of the controller when the operation switch is operated in the opposite polarity during operation. Drive circuit. 8. The drive circuit for an electric retractable door mirror according to claim 2, wherein the operation switch is a single-pole single-throw self-return switch. 9. The drive of an electric folding mirror according to claim 8, wherein the controller includes a timer circuit that reverses the output polarity of the controller when the operation switch is operated during operation. circuit. 10. The drive circuit for an electric folding door mirror according to claim 8, wherein the controller includes a timer circuit that stops the operation of the controller when the operation switch is operated during operation. .