JPH0247070Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a control circuit for a vehicle mirror that is capable of rotating a mirror housing between a set position and a retracted position using a motor.

[Conventional technology]

Mirrors attached to vehicle doors have a larger protruding dimension than fender mirrors, making them difficult to store when garaging or shipping, so a mechanism is built in to fold the mirror housing into the retracted position. However, in the past, the driver had to manually fold down the mirror housing, which was extremely troublesome.

Therefore, the present applicant incorporated a motor into the mirror housing, and by operating the operation switch from the driver's seat, the applicant developed a mirror that can be set in a predetermined position and tilted into a storage position such as when entering a garage. A device equipped with an electric tilting mechanism was developed and applied for (Utility Application No. 59-3372, Utility Model Application No. 1983).
-Refer to No. 115747).

[The problem that the idea aims to solve]

However, with this configuration, if force is applied to tilt the mirror housing from the set position in the direction opposite to the retracted position, the motor circuit will be disconnected from the control circuit, making it impossible to operate the switch. However, there is a problem in that the mirror cannot be returned to the set position even if the mirror is set.

The purpose of the present invention is to improve the problems of the prior art described above and to provide a mirror control circuit that allows the drive circuit to be operated from any mirror state to the set position or retracted position by operating a switch from the driver's seat. do.

[Means to solve the problem]

In order to achieve the above-mentioned purpose, this invention attaches a mirror housing to a mirror base in a rotatable manner,
It has a built-in motor and gear mechanism to rotate the mirror housing from the set position to the storage position, and the mirror housing can be moved to the set position and stored by sliding contact between the conductive pattern fixed to the mirror base side and the brush fixed to the mirror housing side. In a control device for an electric retractable mirror that automatically stops a motor at a certain position, the conduction pattern is
It has an approximately semicircular shape, and has a first notch at one end that determines the storage position, and approximately 90 degrees from the first notch.
It has a second notch part which determines the set position which is at a position offset by a degree, and a third notch part having approximately 1/4 circumference extending from the second notch part to the outer periphery of the first notch part. The brushes include a first brush disposed closest to the center of the conductive pattern, and a first brush disposed closest to the center of the conductive pattern.
a second brush disposed outside the first brush corresponding to the notch; a third brush disposed outside the second brush corresponding to the second notch;
and a fourth brush located at the outermost position corresponding to the third notch, and arranged so that these four brushes move in alignment on the radius of the semicircular conduction pattern. The second and third brushes are connected to one circuit of a polarity switching switch consisting of two four-contact circuits connected to a DC power source via diodes connected in antiparallel, and the first brush is connected to the other circuit of the changeover switch via the relay coil, and a fourth brush is connected in parallel to the first brush and the relay coil.
a brush connected through a diode and a relay coil, further connecting the motor to a circuit in parallel with the relay coil connected to the first brush when the relay coil of the first brush is energized, The motor is connected via a switch circuit that shorts both ends of the motor when it is de-energized, and by energizing and de-energizing a relay coil connected to the fourth brush,
The present invention is characterized in that the direction of power feeding to the motor is switched.

[Effect]

The control circuit for the electrically retractable mirror of the present invention is constructed as described above, so when the changeover switch is switched to the retracting direction in the set position, the relay coil connected to the first brush is energized to drive the motor. When the mirror housing reaches the retracted position due to the drive of the motor, the second brush comes into contact with the notch to de-energize the relay coil, stop the motor, and switch the selector switch from the retracted position to the set direction. Then, the relay coil connected to the first brush via the third brush is excited and drives the motor in the opposite direction, so that when the mirror housing reaches the set position, the third brush comes into contact with the notch. By this, the excitation of the relay coil is canceled and the motor is stopped, and both ends of the motor can be short-circuited and braking can be performed at any of the above-mentioned stops.

In addition, if the mirror housing is tilted from the set position in the opposite direction to the storage direction, when the changeover switch is switched to the set direction, the polarity of the motor is switched by the relay coil connected to the fourth brush, and the first brush A relay coil connected to allows the motor to enter the circuit and return to the set position.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings. Figures 1 to 3 are diagrams explaining the specific configuration of the door mirror, in which Figure 1 is a partially cutaway plan view, Figure 2 is a similar front view, and Figure 3 is the same as in Figure 2. It is a partially enlarged sectional view.

The solid lines in Figures 1 and 2 indicate the set position, but when moved to the retracted position by motor drive,
It will look like the two-dot chain line in FIG. In these figures, 1 is a motor housed in a mirror housing 2, 3 is a gear driven by the motor 1, and 4 is a motor housed in a mirror housing 2.
5 is a mirror base, 5 is a mirror, 6 is a hollow shaft whose lower part is fixed to the mirror base 4, and 7 is a gear fitted into the hollow shaft 6, which meshes with the gear 3. 8 is a spring fitted into the hollow shaft 6, and the gear 7
and the collar 9 of the hollow shaft 6, pushing the gear 7 toward the protrusion 10 of the mirror housing 2. 11
is a contact holder for detecting the rotational position of the mirror housing 2, and is fixed to the mirror housing 2. Reference numeral 12 is a current-carrying brush attached to the contact holder 11, and reference numeral 13 is a disk fixed to the upper part of the hollow shaft 6 fixed to the mirror base 4.
A conductive pattern (described later) is formed on the upper surface. The lead wire drawn out from the contact holder 11 is routed through the hollow part of the hollow shaft 6 to the driver's seat along with the lead wire of the motor 1.

Reference numeral 14 denotes a fitting ring which is loosely fitted into a notch 6' formed in the hollow shaft 6, and has a configuration shown in the partial view of FIG. 3. 15 is a contact plate integrated with the upper surface of the gear 7. Normally, the gear 7 is pushed by a spring 8 to maintain the state shown in the figure, and the gear 7, the fitting ring 14, and the hollow shaft 6 are fixed by friction generated between them, and the gear on the motor side 3 rotates, the gear 3 rotates along the gear 7 on the hollow shaft 6 side, so that the mirror housing 2 rotatably supported on the hollow shaft 6 can be rotated.

When the mirror housing 2 is knocked down by a forced force from the outside, the external force overcomes the frictional resistance caused by the spring 8, and the contact surface between the gear 7 and the fitting ring 14 slips, causing damage to the gears 7 and 3. There is a buffer structure to prevent this. In this case, motor 1
Since the gear 3 is not rotated, the contact holder 11 that detects the rotational position of the mirror housing 2 remains in its original state.

Next, the mirror drive circuit will be described with reference to FIGS. 4 and 5 a to 5e.

In Fig. 4, 13 is the disk shown in Fig. 2,
A substantially semicircular conductive pattern 16 is formed on its surface, and four brushes 12a held by the contact holder 11 are attached to this conductive pattern 16.
12b, 12c, and 12d are in contact so as to be aligned and movable on the radius of the semicircular conductive pattern.

Among the four brushes, the first brush 12a
is located near the center of the semicircular conductive pattern 16, so that it contacts the conductive pattern even when the mirror housing is in the retracted position, the set position, and even when it is rotated from the set position to the opposite side of the retracted position. It is configured. The second brush 12b is
It is arranged on the outside of the brush 12a, and is configured so that it contacts the first notch 17 only at the retracted position, which is one end of the semicircle, and is always located on the conductive pattern 16 at the other end. Third brush 12c
is arranged on the outside of the second brush 12b, and approximately 1/
4. At the set position located on the 4th circumference, the second notch 1
8, and the others are always located on the conductive pattern 16. 4th brush 1
2d is disposed on the outermost side and contacts a third notch 19 having approximately 1/4 circumference continuous with the second notch 18 between the set position and the storage position,
It is configured to come into contact with the conductive pattern 16 only when it is rotated from the set position in the opposite direction to the stored position.

Then, the second and third brushes 12b, 12
C is connected to the lead wire 23 of one circuit of a polarity changeover switch 22 consisting of two four-contact circuits connected to the battery 21 through anti-parallel connected diodes 28 and 29. The first brush 12a is connected to a lead wire 24 of the other circuit of the changeover switch 22 via a relay coil 26. Further, the fourth brush 12d is connected to the lead wire 24 via a diode 27 and a relay coil 25.

The lead wire 24 is connected to the relay coil 25.
The motor 1 is connected in parallel to the relay coil 26 through switch circuits 25A and 25B that are switched by energizing and de-energizing the relay coil 26, and a switch circuit 26A that is switched by energizing and de-energizing the relay coil 26. ing. That is, the switch circuits 25A, 25
B switches the motor circuit depending on whether the relay coil 25 is energized or not, and the switch circuit 26A switches the motor 1 into the circuit when the relay coil 26 is energized,
When the motor is de-energized, both terminals of the motor are short-circuited. As described above, the conductive pattern 16 has a first notch 17 located at one end of the semicircle that determines the storage position, and a second notch 18 located approximately at 1/4 circumference that determines the set position. , and a third notch 19 of 1/4 circumference between the set position and the storage position. Note that 20 is a mounting hole.

21 is a battery, and 22 is a changeover switch provided in the driver's seat and consisting of 4 contacts and 2 circuits for changing the polarity of the battery, contacts 22a and 22, respectively.
b, 22c, 22a', 22b', and 22c'. The contacts 22a and 22c' are short-circuited and drawn out as the lead wire 23 of the one circuit, and the contacts 22c and 22a' are short-circuited and drawn out as the lead wire 24 of the other circuit.

Next, the operation of the circuit connected and configured as shown in the figure is explained in the fifth section.
This will be explained with reference to Figures a to e.

First, a case will be described in which the door mirror is moved from the set position shown by the solid line in FIG. 1 to the retracted position shown by the two-dot chain line. When the movable contacts of the changeover switch 22 are switched from the neutral position shown in FIG. 5a to the contacts 22c and 22c' as shown in FIG. 5b, the conduction pattern 1
6. Current flows through the diode 29 to the relay coil 26 to excite it, and therefore the switch circuit 26
A is switched to the contact 26a, and the motor 1 is driven to rotate the mirror housing in the storage direction. Then, in the storage position shown in FIG. 5c, the second brush 12b contacts the first notch 17, the current to the relay coil 26 is cut off, and the switch circuit 26A
6b side to short-circuit both terminals of the motor 1, and forcibly stop the motor 1 by dynamic braking.

Next, from this state, switch the changeover switch 22 to contact 2.
2a, 22a' side, as shown in FIG.
a and drive motor 1 in the opposite direction to the above,
Rotate the mirror housing toward the set position. Then, when the mirror housing returns to the cassette position, the third brush 12c is inserted into the second notch 18.
, the current to the relay coil 26 is cut off, the switch circuit 26A is switched to the contact 26b side, and is forcibly stopped by dynamic braking in the same manner as described above.

Also, if the mirror housing is forcibly knocked over in the opposite direction to the storage direction,
The contact relationship between the brush and the disc on which the conductive pattern is formed is as shown in Figure 5e.
2 to the contact 22a, 22a' side, current flows to the relay coil 25 via the diode 28, conduction pattern 16, and diode 27, switches the switch circuits 25A, 25B to the contact 25a, 25a' side, and current flows to the motor 1. The current is reversed to that in FIG. 5d, the mirror housing is returned to the set position, and the motor 1 is also stopped by dynamic braking.

[Effect of idea]

As described above, according to the present invention, the mirror can be freely stored and moved to the set position by motor drive by switching a switch, and its stop can be precisely positioned. Further, even if the mirror housing is knocked down from the set position in the opposite direction to the storage direction by external force, it can be easily returned to its original position by operating a switch.

[Brief explanation of the drawing]

The attached drawings are diagrams for explaining one embodiment of the present invention, in which FIG. 1 is a partially cutaway plan view of a door mirror, FIG. 2 is a partially cutaway front view of the door mirror, and FIG. 3 is a partially cutaway front view of the door mirror. FIG. 4 is a partially enlarged cross-sectional view of FIG. FIGS. 5a to 5e are explanatory views of the operation when the door mirror is retracted and set, and when the door mirror is knocked down by an external force. 1...Motor, 2...Mirror housing, 3,
7...Gear, 4...Mirror base, 5...Mirror, 6...Hollow shaft, 8...Spring, 9...
Tsuba, 10...Protrusion, 11...Contact holder, 12
... Brush, 13 ... Disc, 14 ... Fitting ring, 15 ... Plate, 16 ... Continuity pattern, 1
7, 18, 19... Notch, 21... Battery, 22... Changeover switch, 23, 24... Lead wire, 25, 26... Relay coil, 25A, 2
5B, 26A...Switch, 27, 28, 29...
…diode.

Claims (1)

[Scope of utility model registration request] The mirror housing is rotatably attached to the mirror base, and has a built-in motor and gear mechanism to rotate the mirror housing from the set position to the stored position. In a control device for an electric retractable mirror in which the motor is automatically stopped at the set position and the retracted position by sliding contact with a brush, the conductive pattern is formed into a substantially semicircular shape, and one end of the motor is located at the retracted position. a first notch for determining the set position, a second notch for determining the set position located approximately 90 degrees from the first notch, and a second notch for determining the set position; The brush includes a first brush disposed closest to the center of the conductive pattern;
A second brush arranged outside the first brush corresponding to the first notch, and a third brush arranged outside the second brush corresponding to the second notch. and a fourth brush located at the outermost position corresponding to the third notch,
These four brushes were arranged to move in alignment on the radius of the semicircular conduction pattern, and the second and third brushes were connected to a DC power source via diodes connected in antiparallel. The first brush is connected to one circuit of a polarity changeover switch consisting of two circuits of four contacts, and the first brush is connected to the other circuit of the changeover switch via a relay coil. A fourth brush is connected in parallel with the relay coil via a diode and the relay coil, and further in parallel with the relay coil connected to the first brush, when the relay coil of the first brush is excited. The motor is connected to a circuit via a switch circuit that shorts both ends of the motor when it is de-energized, and the relay coil connected to the fourth brush is energized and de-energized, thereby causing the motor to be energized. A control circuit for an electric retractable mirror characterized by switching the direction of power supply.