JPH10278675A - Drive control circuit for outer mirror device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely stop the drive of an electric motor at the service position and the storage position of a shaft by bringing a slide-contactor into contact with a conductive pattern immediately before the stop position of the shaft, and stopping the electric motor in the delay of the prescribed time after the contact of the conductive pattern with the slide-contactor. SOLUTION: When a shaft reaches the part of several degrees before the forward storage position, a slidable contact spring is brought into contact with a conductive pattern 19e forward in the advancing direction, and brought into contact with a conductive pattern 19f forward in the advancing direction. The line 31 is connected to the line 32. When a transistor Q2 is turned on, the collector-emitter is short-circuited, the current from a terminal P0 flows into a terminal P1 through the collector-emitter, the voltage applied to a gate of an FET 2 is no more than the prescribed value, and the FET 2 is turned off. Thus, the energization to the electric motor 18 is disconnected to stop the drive of the electric motor 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a vehicle outer mirror device for rotating a shaft carrying an outer mirror between a use position and a storage position.

[0002]

2. Description of the Related Art Conventionally, there is known an outer mirror device for a vehicle in which a shaft carrying an outer mirror is rotated between a use position and a storage position. This conventional outer mirror device for a vehicle includes a drive control circuit that controls driving of an electric motor. The drive control circuit includes an overcurrent detection for detecting an overcurrent flowing through the electric motor based on an overload applied to the electric motor at the stop position in order to stop driving of the electric motor at the use position and the storage position of the shaft. Means are provided.

[0003]

However, this conventional drive control circuit is greatly affected by environmental conditions such as temperature and humidity, and fluctuations in voltage and the like, and drives the electric motor at the use position and the storage position of the shaft. It is difficult to reliably stop. Further, since the configuration is such that overload applied to the electric motor is detected, the driving torque of the electric motor is several times (5 times) the normal torque required to rotate the shaft between its use position and the storage position. PTC elements as overcurrent detection means are arranged in series with the electric motor, and the driving of the electric motor is stopped by increasing the internal resistance of the PTC element. For this reason (see Japanese Patent Application Laid-Open No. 8-268160), it is difficult to effectively use the driving torque (power) of the electric motor, and the margin torque of the electric motor is substantially small.

On the other hand, conventionally, as a drive control circuit,
There is also known a printed circuit board on which a conductive pattern that defines a rotation range of a shaft by an electric motor is provided, and a sliding contact that can slide on the conductive pattern and is rotated integrally with the shaft. ing.

[0005] However, even in this conventional drive control circuit, the use position and the storage position of the shaft cannot be changed due to variations in dimensions of parts such as a case, a shaft, a printed circuit board, a conductive pattern, a sliding contact, and assembly errors. It is difficult to stop the driving of the electric motor without fail. When the shaft is rotated from the storage position to the use position, a short run (a phenomenon in which the electric motor is turned off before the use position) and an overrun (the use position (The phenomenon that the electric motor is turned off when the electric motor is turned off).

[0006] The present invention has been made in view of the above circumstances, and an object of the present invention is to make it possible to efficiently use the power of an electric motor, to use a shaft, and to use a shaft.
An object of the present invention is to provide a drive control circuit of an outer mirror device for a vehicle, which can surely stop driving of an electric motor at a storage position.

[0007]

According to the present invention, a drive control circuit for an outer mirror device for a vehicle according to the present invention carries an outer mirror and is rotatable between a use position and a storage position. A shaft, an electric motor for driving the shaft, and a conductive pattern provided on a printed circuit board and being in contact with a sliding contact rotatable with the shaft and defining a range of rotation of the shaft by the electric motor. The sliding contact can be brought into contact with the conductive pattern existing in the forward direction of the shaft immediately before the rotation stop position of the shaft, and the electric motor is delayed by a predetermined time from the contact between the conductive pattern and the sliding contact. Drive is stopped

[0008]

According to the outer mirror device for a vehicle according to the present invention, immediately before the rotation stop position of the shaft, the sliding contact is brought into contact with the conductive pattern present in front of the sliding direction. The drive of the electric motor is stopped after a predetermined time from the contact between the conductive pattern and the sliding contact.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an outer mirror device for a vehicle according to the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a shaft, 2 is an upper case for a housing, and 3 is a lower case. The shaft 1 has an engagement flange portion 4 and a columnar portion 5 as shown in FIGS. A bolt 6 is implanted in the engagement flange 4, and a stay (not shown) carrying a mirror and a mounting flange integrated with the stay are fixed to the engagement flange 4 via the bolt 6. The lower surface of the engagement flange portion 4 has a known arc-shaped ball guide groove. The arc-shaped ball guide groove regulates the rotation angle of the shaft 1 between the use position and the storage position of the vehicle door mirror.

A ball 7 is rotatably disposed in the upper case 2, and the ball 7 is fitted in an arc-shaped ball guide groove. The columnar portion 5 of the shaft 1 has an oval cross section. The lower end of the columnar portion 5 is a small-diameter columnar portion 5a. A bearing hole 3a is formed in the lower case 3, and the small diameter column portion 5a is supported by the bearing hole 3a. A washer 8 and an O-ring 9 are inserted into the columnar portion 5 of the shaft 2 on the upper surface side of the upper case 2. A stopper member 10 is fixed to the upper surface of the upper case 3 by screws 11 as shown in FIG. The stopper member 10 has a circular arc shape that curves along the outer shape of the engagement flange portion 4 when viewed from above.

As shown in FIG. 1, a clutch holder 12 is inserted through the columnar portion 5. The clutch holder 12 has an oval insertion hole at the center. At the periphery of the clutch holder 12, an engagement protrusion 12a is formed around the insertion hole. Here, the engagement projections 12a are formed every 120 degrees, and have a mountain shape. The clutch holder 12 is meshed with and engaged with the drive gear 13.

The drive gear 13 has a tooth portion 13a, a circular center hole, and an engagement recess. The engagement recess has a shape corresponding to the engagement protrusion 12a. The drive gear 13 is a spring 1
The drive gear 13 and the clutch holder 12 are always meshed and engaged by being urged downward by the gears 4 and 15. The upper ends of the springs 14 and 15 are in contact with the lower surface of a washer 16 as a spring receiver, and the lower ends thereof are in contact with the upper surface of the drive gear 13. The drive gear 13 and the clutch holder 12 are prevented from coming off by an E-ring 17.

An electric drive mechanism is provided inside the upper case 2. The electric drive mechanism is schematically composed of an electric motor 18, a printed circuit board 19, a worm 20, a helical gear 21, and a worm 22, as shown in FIG. The worm 20 meshes with the helical gear 21, the helical gear 21 rotates integrally with the worm 22, the worm 22 meshes with the drive gear 13, and the worm 20, the helical gear 21, the worm 22, and the drive gear 13 rotate the electric motor 18 on the shaft 1. Play a role to communicate.

As shown in FIG. 2, the engaging flange 4 has an engaging notch 4a formed on the outer periphery thereof. The stopper member 10 faces the rotation area of the engagement notch 4a. The shaft 1 is rotatable either manually or electrically. In FIG. 2, reference numeral θ1 denotes an electric driving range, reference numeral θ2 denotes a manual driving range, and the shaft 1 is moved from the use position shown in FIG. When electrically driven, the shaft 1 is rotated from the use position to the front storage position, and when the shaft 1 is manually driven in the direction of arrow B, the shaft 1 is rotated from the use position to the rear storage position.

The detailed structure of these mechanisms is substantially the same as that of Japanese Patent Application Laid-Open No. 8-268160, and a detailed description thereof will be omitted.

The printed circuit board 19 has the shape shown in FIG. 3, and has a circular through hole 19a through which the columnar portion 5 of the shaft 1 penetrates and a positioning hole 19b at the center.
Around the circular through hole 19a, arc-shaped conductive patterns 19c, 19d, 19e, and 19f are provided.
The conductive patterns 19c, 19d, 19e, and 19f are formed on the lower surface side of the printed circuit board 19. The conductive patterns 19c to 19f are to be brought into contact with a sliding contact described later.
The relationship with 9f will be described later.

The printed circuit board 19 is located between the slider holder members 23 and is fixed to the upper case 2 via the plate member 24. The slide contact holder member 23 is
As shown in FIGS. 4 and 5, a cylindrical main body 2 for accommodating the sliding contactor.
5 and a lid member 26. Cylindrical body 25
4A and 4B, an inner cylinder 25b having an oval hole 25a corresponding to the oval cross section of the columnar portion 5, as shown in FIGS.
, An outer cylinder 25c, a pair of flexible engaging claws 25d, and a sliding contact housing 25e.

A fixed wall portion 2 for fixing the sliding contact 27 shown in FIGS. 6A and 6B is provided in the sliding contact housing 25e.
5f, 25g, a fitting projection 25h that fits into the fitting hole 27a of the sliding contact 27 to fit and hold the sliding contact 27, and a guide hole 25i that guides the upright portion 27b of the sliding contact 27. Is provided.

The cover member 26 is formed with a circular through hole 26a having a diameter larger than the outer shape of the columnar portion 5. An engagement notch 26b is formed on the inner peripheral wall of the circular through hole 26a to engage with a positioning protrusion 25j formed at the upper end of the inner cylinder 25b. The lid member 26 holds the sliding contact 27 in the sliding contact housing portion. In the state set in 25e, it is assembled to the cylindrical main body 25.
The cylindrical main body 25 is rotatable integrally with the shaft 1 while being inserted through the shaft 1, so that the sliding contact 27 is rotated integrally with the shaft 1.

As shown in FIG. 6, the sliding contact 27 has contact spring portions 27c, 27d and 27e.
To 27d are contact portions 27f with the conductive pattern. The conductive pattern 19e is located at the innermost circumference as shown in FIGS. 3 and 8, the conductive patterns 19d and 19f are located at the outermost circumference on the same virtual circle, and the conductive pattern 19c is located between the innermost circumference and the outermost circumference. It is located on a virtual circle between them. As shown in FIG. 7, the contact spring portion 27c is
e, the contact spring portion 27d can contact the conductive pattern 19c, and the contact spring portion 27e can contact the conductive patterns 19d, 19f.

The conductive pattern 19e is connected to the line 31 of the control circuit 30 shown in FIG. 8, the conductive pattern 19f is connected to the line 32, the conductive pattern 19c is connected to the line 33, and the conductive pattern 19d is connected to the line 34. Have been.

The control circuit 30 includes an energizing circuit 30A for energizing the electric motor 18 for rotating the shaft 1 from the use position toward the front storage position, and rotating the shaft 1 from the front storage position to the use position. And an energizing circuit 30B for energizing the electric motor 18 for causing the electric motor 18 to operate.

The energizing circuit 30A has a switching transistor Q1 and a field effect transistor FET1. The emitter of the switching transistor Q1 is connected to the terminal P0 of the control circuit 30. Terminal P0 is line 3
1 connected. The collector of the switching transistor Q1 is connected to one end of the resistor R9 and the Zener diode ZD2.
And one end of the resistor R2. The anode of Zener diode ZD2 is connected to terminal P0.

The base of the switching transistor Q1 is connected to its emitter via a resistor R10.
It is connected to the anode of Zener diode ZD4 via resistor R11. The cathode of the Zener diode ZD4 is connected to one end of the capacitor C2 and one end of the resistor R8, and is connected to the anode of the diode D2. The other end of the capacitor C2 is connected to the terminal P0 and one end of the resistor R6. The other end of the resistor R8 is connected to the other end of the resistor R6. The cathode of the diode D2 is connected to one end of the resistor R4, and the other end of the resistor R4 is connected to the line 34 and to the other end of the resistor R6.

The other end of the resistor R2 is connected to the gate of the FET1. The source of FET1 is connected to terminal P0. The drain of the FET1 is connected to the anode of the bidirectional Zener diode ZD6, and the electric motor 18
Are connected to the power supply terminal R of A diode ZDX is provided between the drain and the source of the FET1.

The energizing circuit 30B has a switching transistor Q2 and a field effect transistor FET2. The emitter of the switching transistor Q2 is connected to the terminal P1 of the control circuit 30. Terminal P1 is line 3
3 is connected. The collector of the switching transistor Q2 is connected to the other end of the resistor R9 and the Zener diode ZD1.
And one end of the resistor R1. The anode of the Zener diode ZD1 is connected to the terminal P1.

The base of the switching transistor Q2 is connected to its emitter via a resistor R12.
The resistor R13 is connected to the anode of the Zener diode ZD3. The cathode of the Zener diode ZD3 is connected to one end of the capacitor C1 and one end of the resistor R7, and is connected to the anode of the diode D1. The other end of the capacitor C1 is connected to the terminal P1 and one end of the resistor R5. The other end of the resistor R7 is connected to the other end of the resistor R5. The cathode of the diode D1 is connected to one end of the resistor R3, and the other end of the resistor R3 is connected to the line 32 and to the other end of the resistor R5.

The other end of the resistor R1 is connected to the gate of the FET2. The source of FET2 is connected to terminal P1. The drain of the FET 2 is connected to the anode of the bidirectional Zener diode ZD6, and the electric motor 18
Is connected to the power supply terminal B. A diode ZDY is provided between the drain and the source of the FET2.

When the outer mirror is at the use position, the sliding contact 27 is at the POS position as shown in FIGS. At this time, the sliding contact spring 27d is in contact with the conductive pattern 19c, and the sliding contact spring 27e is in contact with the conductive pattern 29d. Therefore, the line 33 and the line 34 are connected. The conductive patterns 19c and 19d are provided within a range in which the shaft 1 is rotated from a few degrees before the use position to the rear storage position, and the shaft 1 is manually rotated from the use position to the rear storage position. When this is done, the sliding contact springs 27d, 27e are always in contact with the conductive patterns 19c, 19d. The conductive patterns 19f and 19e are provided from the front storage position several degrees before the front storage position to the front storage position.

The control circuit 30 includes a changeover switch 35
Supplies a power supply voltage. Changeover switch 35
Can be switched between three positions: a power-off position, a front storage position, and a use position.

When rotating the outer mirror from the use position (or the rear storage position) to the front storage position, the changeover switch 35 is operated to apply a "+" voltage to the terminal P0 and to apply a voltage to the terminal P1. Apply "-". Then, F is applied via the Zener diode ZD2, the resistor R9, and the resistor R1.
When a voltage is applied to the gate of ET2, FET2 is turned on and its source and drain are short-circuited. Therefore, a current flows in the direction of arrow X1 toward the terminal P1 through the terminal P0, the diode ZDX, the power supply terminal R, the electric motor 18, the power supply terminal B, and the source-drain of the FET2, and the shaft 1 is moved forward by the electric motor 18. It is rotated toward the storage position.

When the shaft 1 reaches the front storage position several degrees before, the sliding contact spring 27c comes into contact with the conductive pattern 19e existing forward in the traveling direction, and the sliding contact spring 27e contacts the conductive pattern 19f existing forward in the traveling direction. Contact. Thus, the line 31 and the line 32 are connected. Then, the voltage at the terminal P0 is applied to the capacitor C1 via the lines 31 and 32, and the capacitor C1 is charged to a predetermined voltage after a predetermined time delay. As a result, a voltage is applied to the base of the transistor Q2, and the transistor Q2 turns on. When the transistor Q2 is turned on, the collector and the emitter thereof are short-circuited, and the current from the terminal P0 flows through the collector and the emitter to the terminal P1, and the FE
Since the voltage applied to the gate of T2 becomes a predetermined value or less, F2
ET2 is turned off. Accordingly, the power supply to the electric motor 18 is stopped, and the driving of the electric motor 18 is stopped.

When rotating the shaft 1 from the front storage position to the use position, the changeover switch is operated to apply a "+" voltage to the terminal P1 and a "-" voltage to the terminal P0. Then, the Zener diode Z
A voltage is applied to the gate of the FET 1 via D1, the resistor R9, and the resistor R2, and the FET 1 is turned on, so that the source and the drain thereof are short-circuited. Therefore, current flows in the direction of arrow X2 toward terminal P0 via terminal P1, diode ZDY, power supply terminal B, electric motor 18, power supply terminal R, and the source-drain of FET1, and shaft 1 is moved forward by electric motor 18. It is rotated from the storage position to the use position. The contact state between the sliding contact 27 and the conductive pattern is cut off a few degrees before the storage position and a few degrees before the use position, so that the transistor Q2 is turned off.

When the shaft 1 reaches a few degrees before the use position, the sliding contact spring 27d comes into contact with the conductive pattern 19c existing forward in the traveling direction, and the sliding contact spring 27e contacts the conductive pattern 19d existing forward in the traveling direction. . This allows
The line 33 and the line 34 are connected. Then, the voltage of the terminal P1 is transferred through the lines 33 and 34 to the capacitor C2.
And the capacitor C2 is charged to a predetermined voltage after a predetermined time delay. As a result, a voltage is applied to the base of the transistor Q1, and the transistor Q1 turns on.
When the transistor Q1 is turned on, the collector and the emitter thereof are short-circuited, the current from the terminal P1 flows through the collector and the emitter to the terminal P0, and the voltage applied to the gate of the FET1 becomes equal to or less than a predetermined value. Turned off. Accordingly, the power supply to the electric motor 18 is stopped, and the driving of the electric motor 18 is stopped.

[0036]

The vehicle outer mirror device according to the present invention is constructed as described above, so that the power of the electric motor can be efficiently used and the electric motor can be driven at the shaft use position and the storage position. Can be reliably stopped.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an internal configuration of a vehicle outer mirror device according to the present invention.

FIG. 2 is a top view of the vehicle outer mirror device according to the present invention.

FIG. 3 is a plan view of a printed circuit board according to the present invention.

4A and 4B show a holder member according to the present invention, wherein FIG. 4A is a plan view, FIG. 4B is a bottom view, and FIG. 4C is Z0-Z0 of FIG.
FIG. 3D is a cross-sectional view along a line, and FIG. 4D is a partial cross-sectional view along a Z1-Z1 line in FIG.

5 shows a lid member of the holder member shown in FIG. 4,
(A) is the top view, (b) is sectional drawing which follows the Z3-Z3 line of (a).

6A and 6B show a sliding contact according to the present invention, wherein FIG. 6A is a plan view and FIG. 6B is a side view.

FIG. 7 is a diagram showing a positional relationship between a printed circuit board and a sliding contact according to the present invention, and showing a state where the printed circuit board and the electric motor are viewed from below.

FIG. 8 is a control circuit diagram according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Shaft 18 ... Electric motor 19 ... Printed circuit board 19c-19f ... Conductive pattern 27 ... Slider 30 ... Control circuit

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Hiroyasu Onuki 80 Itado, Isehara City, Kanagawa Prefecture Ichikoh Industries Co., Ltd. Isehara Works

Claims (1)

[Claims] A shaft that carries an outer mirror and is rotatable between a use position and a storage position; an electric motor that drives the shaft; and a motor that is provided on a printed circuit board and that can rotate integrally with the shaft. A conductive pattern that is in contact with the slider and that defines a rotation range of the shaft by the electric motor, wherein the slider contacts a conductive pattern that is present in the forward direction of the shaft just before the rotation stop position of the shaft. A drive control circuit for an outer mirror device for a vehicle, wherein the drive is stopped with a delay of a predetermined time from a contact between the conductive pattern and the slide contactor.