JPH0247069Y2 - - 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 has incorporated a motor into the mirror housing, and by operating the operation switch from the driver's seat, the applicant has developed a motorized mirror that can be set in a predetermined position and tilted into a storage position such as when entering a garage. Developed a device with a tilting mechanism.
Applications have been filed (Utility Application No. 3372, Utility Application No. 1983, Utility Application No. 1983-
(See 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 as described above, and to provide a mirror control circuit that can drive the mirror from any state to the set position or retracted position by operating a switch from the driver's seat. .

[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,
The mirror housing has a built-in motor and gear mechanism for rotating the mirror housing from the set position to the storage position, and the mirror housing is rotated 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 set position and a retracted position, the conduction pattern is connected to a first circuit that interrupts the energizing circuit of the motor at the mirror set position and in a direction opposite to the mirror retracted direction. a notch, a second notch that cuts off the motor's energizing circuit at the mirror storage position that is offset by approximately 90 degrees from the first notch, and It has a third notch that interrupts the short circuit, and has a substantially 1/2 circular shape that always constitutes a short circuit for the motor in the direction opposite to the mirror storage direction from the mirror set position, and the brush for this is The first notch located at the outermost side corresponding to the first notch.
a second brush located inside the first brush and always in contact with the conductive part;
A third brush located inside the second brush corresponding to the notch, and a fourth brush located innermost corresponding to the third notch, and these four brushes Four contacts arranged so that two brushes move in alignment on the radius of the semicircular conduction pattern, and connected to a DC power source via a diode in which the first and second brushes are connected in antiparallel. The third brush is connected to one circuit of a polarity changeover switch consisting of two circuits, the third brush is connected to the other circuit of the polarity changeover switch via a motor, and the fourth brush is moved to the mirror set position and then to the mirror storage position. The brush is characterized by being connected to one end of a diode disposed in a circuit that shorts both ends of the motor by contacting the conductive pattern when the brush moves in the opposite direction.

[Effect]

Since the control circuit for the electrically retractable mirror of the present invention has the above-described configuration, the mirror can of course be positioned between the set position and the retracted position by operating the polarity switch. Even when the mirror is forcibly tilted from the set position in the opposite direction to the retracted direction, the motor remains connected to the conductive pattern because a conductive part is formed from the mirror set position in the opposite direction to the mirror retracted direction. , the mirror can be returned to the set position or storage position by operating the polarity switch.

〔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 is formed on the top 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 configuration and operation of the mirror control circuit will be explained with reference to FIG. In Figure 4, 1
6 is battery, 17 is 4 contacts including neutral contact 2
This is a circuit changeover switch that changes the battery polarity applied to the motor. Note that this changeover switch 17 has three contacts 2 without a neutral contact.
It may also be a circuit changeover switch. 18 is a motor,
This corresponds to the motor 1 shown in FIG. 19,
20 is a diode connected in antiparallel to the lead wire 21 of one circuit drawn out from the changeover switch 17;
Reference numeral 22 denotes a conductive pattern, which has a substantially 1/2 circular shape and is formed on the upper surface side of the disk 13 in FIG. 23a is the first brush, 23b is the second brush
The brush is connected to one end side of the diodes 19 and 20. A third brush 23c is connected to one end of the motor 18. 23d is the fourth brush, and the motor short circuit diode 27
is connected to one end of the These four brushes are aligned on the radius of the semicircular conductive pattern 22 and slide and rotate on the conductive pattern 22 as described below. Reference numerals 24 to 26 denote first to third notches formed in the conductive pattern 22, of which the first notch 24 connects the first brush 23a to the conductive pattern 22 at the mirror set position and in a direction opposite to the mirror storage direction. The second notch 25 is for removing the second brush 23b from the conductive pattern 22 at the mirror storage position. Furthermore, when the fourth brush 23d moves between the mirror set position and the mirror storage position, the third notch 26 comes into contact with the insulating part of the notch 26, and moves from the mirror set position to the mirror storage position in the opposite direction When the brush moves in this direction, it maintains contact with the conductive pattern 22. In addition, 27 is a diode inserted between the fourth brush 23d and the lead wire 28 of the other circuit drawn out from the changeover switch 17, and short-circuits both ends of the motor 18 in the mirror set position to cause the motor 18 to generate electricity. This is to form a circuit that applies braking.

In addition, the polarity changeover switch 1 of the 4-contact 2-circuit
7 are common contacts 17a, 17a' and contacts 17b, 1 which are closed when the mirror is to be placed in the set position.
7b', neutral contacts 17c and 17c' used when the mirror is not driven at all, and contacts 17d and 17d' that are closed when it is desired to store the mirror,
Contacts 17b and 17d' and contacts 17d and 17b' are short-circuited and connected to lead wires 21 and 28, respectively. In addition, as shown in the figure, the neutral contact 17
By retaining movable contacts at c and 17c', the battery 16 is completely cut off from the motor drive circuit, and the problem of spontaneous discharge due to electric contact can be solved.

The circuit state in FIG. 4 shows the mirror set position. When the changeover switch 17 is closed as shown by the broken line in this state, the current from the battery 16 flows through the contacts 17d, 1 of the changeover switch 17.
7b', motor 18, brush 23c, conduction pattern 22, brush 23b, diode 20, contacts 17d' and 17a' of changeover switch 17, battery 16
The motor 18 is driven by the closed circuit. When the motor 18 is driven, the mirror housing 2 rotates together with the brush, and when the brush 23b comes into contact with the notch 25, the motor drive circuit is cut off, and the motor 1
8 stops. In other words, the mirror is in the retracted position.

When the switch 17 is switched from this state as shown by the solid line, the contacts 17a, 17b of the switch, the diode 19, the brush 23a, the conductive pattern 22,
The motor 18 rotates via the brush 23c.
Then, in the illustrated state, the brush 23a comes into insulating contact at the notch 24, the closed circuit of the motor drive circuit is interrupted, and the motor 18 is stopped. In other words, it is the mirror set position. At the same time, the fourth
When the brush 23d contacts the conductive pattern 22, both ends of the motor 18 are short-circuited via the diode 27, and dynamic braking is applied to stop the motor 18 in a short time without being affected by its own inertia.

Even if the mirror housing is tilted from the set position in the opposite direction to the storage direction due to a forced force from the outside, the approximately 1/2 circular shape with the conductive part formed in the direction opposite to the mirror storage direction from the mirror set position Therefore, by switching the changeover switch 17 in the direction of the broken line, the motor rotates, and the mirror housing can be rotated in the set position direction and the storage position direction, and returned to the normal position.

[Effects of the invention] As described above, according to the invention, the mirror can be freely stored and moved to the set position by motor drive by switching a switch, and the mirror housing can be moved from the set position by external force. Even if it is tilted in the opposite direction to the storage direction, it can be easily returned to its normal 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 the door mirror, Fig. 2 is a partially cutaway front view of the door mirror, and Fig. 3 is a partially cutaway plan view of the door mirror. FIG. 4, which is a partially enlarged sectional view of the figure, is a configuration diagram of the drive circuit. 1...Motor, 2...Mirror housing, 3,
7...Gear, 4...Mirror base, 5...Mirror, 6...Hollow shaft, 8...Spring, 9...
Tsuba, 11...Contact holder, 12, 23a-23
d... Brush, 13... Disc, 14... Fitting ring, 15... Plate, 16... Battery, 17
... Polarity switch, 19, 20, 27... Diode, 21, 28... Lead wire, 22... Conductive pattern, 24, 25, 26... Notch.

Claims (1)

[Claims for Utility Model Registration] A mirror housing is rotatably attached to a mirror base, and the mirror housing has a built-in motor and gear mechanism for rotating the mirror housing from the set position to the storage position, and In a control device for an electric retractable mirror, the motor is automatically stopped at the set position and the retracted position by the sliding contact between the conductive pattern fixed to the mirror housing and the brush fixed to the mirror housing side. a first notch that cuts off the energizing circuit of the motor in the position and in a direction opposite to the direction in which the mirror is retracted;
A second notch that cuts off the motor's current-carrying circuit at the mirror storage position, which is offset by about 90 degrees from the notch, and a third cutout that cuts off the motor's short circuit between the mirror storage position and just before the mirror set position. It has a notch, and the direction opposite to the mirror retracting direction from the mirror set position is approximately 1/2 circular, which always constitutes a short circuit for the motor, and the brush corresponding to this has a shape corresponding to the first notch. A first brush located at the outermost side, a second brush located inside the first brush and always in contact with the conductive part, and a second brush located inside the second brush corresponding to the second notch. and a fourth brush located on the innermost side corresponding to the third notch, and these four brushes are arranged on the radius of the semicircular conduction pattern. 4 brushes arranged to move in alignment and connected to a DC power source via diodes that connect the first and second brushes in antiparallel;
The third brush is connected to one circuit of a polarity changeover switch consisting of two circuits of contacts, the third brush is connected to the other circuit of the polarity changeover switch via a motor, and the fourth brush is connected to the mirror set position and then to the mirror set position. A control circuit for an electric retractable mirror, characterized in that the brush is connected to one end of a diode arranged in a circuit that shorts both ends of the motor by contacting a conductive pattern when the brush moves in the opposite direction to the retracting direction.