JP2589562Y2 - Mirror position detection device for vehicle mirror - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mirror position detecting device for a vehicle mirror.

[0002]

2. Description of the Related Art In a vehicle mirror provided in a vehicle such as an automobile, a mirror holder for holding a mirror in a mirror housing is disposed to be tiltable, and the mirror is operated by operating an adjustment switch provided near a driver's seat. There is known a device in which a holder is tilted to adjust a mirror angle. By the way, in such a vehicle mirror, the mirror angle is changed and used after entering a garage, entering an expressway, or changing drivers, and then the mirror angle is restored. Since the operation to restore the angle is troublesome, the mirror position is stored in advance, and after changing the mirror angle, the mirror is returned to the original position by one-touch operation of the switch. Is provided.

As such a vehicle mirror, for example,
Japanese Unexamined Utility Model Publication No. Sho 58-113555 discloses a vehicle mirror in which a permanent magnet is provided at the rear end of an operating rod whose front end is engaged with a mirror holder, and a fixed magnet is provided from the rear end of the operating rod. A magnetic sensor is arranged at an opposing position spaced apart (on the extension of the axis of the operating rod). Then, the magnetic sensor detects a change in magnetic force due to the axial movement of the operating rod, compares the current tilt angle of the mirror with the stored angle, and matches the current angle of the mirror with the stored angle. It is assumed that.

[0004]

However, in such a vehicle mirror, since the magnetic sensor is provided at a position further apart from the rear end of the operating rod, the width of the apparatus in the front-rear direction is increased. There was a defect. Further, in such a vehicle mirror, the distance between the magnet and the magnetic sensor is increased by the axial movement of the operating rod, and the magnetic force of the magnet is generally inversely proportional to the square of the distance. Therefore, there was a problem that it was difficult to detect magnetism with high accuracy.

Therefore, for example, it is conceivable to dispose the magnetic sensor beside the operating rod. However, since the operating rod is structurally separated from the pivot point of the mirror holder, the operating rod is tilted to tilt the mirror holder. When the actuator is moved in the axial direction, the operating rod moves in an arc around the pivot point, and moves (deflects) not only in the axial direction but also in the radial direction, and eventually the distance between the magnet and the magnetic sensor is reduced. There was a problem that it was separated (changed).

[0006]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a substantially flat mirror holder for supporting a mirror.
Attach one point on the back to the fixed side so that it can swing freely.
Attach the operating rod to another point on the back of the
Cast the actuating rod to the fixed side, form the shape of the male thread to the operating rod, this
Screw into the locking claw attached to the fixed side.
The locking lever is rotated by the fixed
Forward and backward, and tilt the operating rod around the locking claw while
-Adjusts the tilt angle of the holder.
With a permanent magnet on the operating rod and a magnetic sensor on the fixed side.
Attach the mirror with the change of the output signal of this magnetic sensor
Detect the tilt angle of the holder and use the magnetic sensor
Characterized in that it faces the locking claw.

[0007]

[Action] Since the magnetic sensor faces the locking claw, the operating rod
Even if it moves forward and backward while tilting about the locking claw, the distance between the permanent magnet and the magnetic sensor can be kept constant, the magnetic force can be detected with high accuracy , and the front-rear width of the device can be reduced. Moreover, even the mirror holder and inclined movement, the operating member is engaged
Since it is tilted around the stop claw, the magnetic sensor is located at the position facing the locking claw, so that it is permanent with the magnetic sensor without adding a guide etc. to prevent the movement of the operating rod in the radial direction. > The magnet spacing can be prevented from changing.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to the accompanying drawings. 1 is a longitudinal sectional view of a vehicle mirror, FIG.
Shows a plan view of a main part. In the drawing, 1 is a mirror, 2 is a substantially flat mirror holder (see FIG. 1) for holding the mirror 1,
Reference numeral 3 denotes a drive unit. The case 4 of the drive unit 3 includes an upper cover 5, a lower cover 6, and an inner cover 7 disposed between the upper cover 5 and the lower cover 6, and forms a pivot 8 on the upper surface of the upper cover 5. The pivot portion 8 is engaged with a locking portion 2 a formed on the back surface of the mirror holder 2, and the mirror holder 2 is configured to be tiltable (swingable) around the pivot portion 8. A hole 8a is formed in the pivot 8 and a bottom surface 8 of the hole 8a is formed.
b and the boss 6a of the lower cover 6 are fastened with screws B1.
A hole 7a formed in the center of the inner cover 7 and a boss 6b of the lower cover 6 are fastened with screws B2. The upper cover 5 and the lower cover 6 have a flange 10,
11 are integrally formed, and these flanges 10 and 11 are fastened to bosses 12 formed in a mirror housing (not shown) via screws B3..., Thereby fixing the drive unit 3 in the mirror housing. . In FIG. 1, reference numeral 13 denotes a sealing material.

In the drive unit 3, drive members 14 made of synthetic resin are disposed, and a motor M is disposed near each drive member 14. These two drive members 14,
14 is located in a direction orthogonal to the pivot 8 as shown in FIG. As shown in FIG. 4, the driving member 14 has a cylindrical base portion 15, a gear portion 16 integrally formed with the base portion 15 via a connection portion 15 a, and a plurality of integrally formed upper portions of the base portion 15. Engaging portions 17... The base 15 is rotatably engaged with a cylindrical support 19 formed on the inner cover 7, and the gear 16 is engaged with a worm 20 of a rotation shaft M1 of the motor M as shown in FIG.
The engaging portion 17 has a prismatic portion as shown in FIG.
A locking claw 17a formed integrally with this portion and directed inward
And

An operating rod 22 is disposed in the driving member 14, and a pivot 22a is integrally formed at one end of the operating rod 22, and the pivot 22a is attached to the back of the mirror holder 2 .
It is swingably engaged with an engagement hole 23 formed in the surface . A hole 24 is formed at the other end of the operating rod 22.
The permanent magnet 25 is fixed inside. Further on the outer periphery of the operating rod 22 is formed a screw groove (male thread) 26, this screw groove 26 locking claw 17a of the engaging portion 17 is engaged (screwed). The permanent magnet 25 may be provided within the range of the thread groove 26. In FIG. 1, reference numeral 50 denotes the operating rod 22 and the upper cover 5.
It is a boot provided between them.

As is apparent from the above description, a vehicle mirror is provided.
-One point on the back of the mirror holder 2 that supports the mirror 1
Is attached to the pivot 8 of the case 4 (fixed side) so that it can swing freely.
At another point on the back of the mirror holder 2
The support portion 22a is swingably mounted, and the operating rod 22 is attached to the case.
4 to form a thread groove 26 in the operating rod 22,
26, the engaging portion 1 rotatably mounted in the case 4
7 is engaged (screwed) with the engaging claw 17a, and the engaging portions 17 are aligned.
Then, the locking claw 17a is rotated by the motor M in the case 4.
The operating rod 22 advances and retreats, and the operating rod 22 is
Adjust the tilt angle of the mirror holder 2 while tilting around 7a
Is to adjust.

In the above configuration, if the motor M is operated by operating the adjustment switch provided in the room, the driving member 14 is rotated via the worm 20 and the gear portion 16, and the operation is performed with this rotation. The rod 22 moves in the axial direction,
The mirror holder 2 is tilted around the pivot 8 and the mirror 1
The tilt angle changes. That is, when the operating rod 22 in FIG. 1 moves upward in the drawing, the mirror holder 2 swings around the pivot 8 to adjust the tilt angle of the mirror 1 in the left-right direction. When the other operating rod 22 moves upward in the drawing, the mirror holder 2 swings around the pivot 8 to adjust the vertical tilt angle of the mirror 1.

When a large force is forcibly applied to the mirror holder 2 from the outside and this force acts on the mirror holder 2 in the direction A in FIG. 1, the engaging portion 17 bends outward (expands). The engagement between the screw groove 26 of the operating rod 22 and the locking claw 17a is released, and the operating rod 22 is forcibly moved rearward in the axial direction, that is, downward in FIG. Prevents excessive force from being applied during That is, the locking groove 26 and the locking claw 17a also function as a clutch that shuts off transmission of force when a large force is forcibly applied.

On the upper surface of the inner cover 7, a substrate 2
The substrate 28 is fixed to the inner cover 7 via the screw B4. A circular opening 28a is formed at the center of the substrate 28, and this opening 28a is located on the outer periphery of the cylindrical portion 30 of the upper cover 5 as shown in FIG. or,
A plurality of small-diameter holes 28b are formed in the substrate 28, and the holes 28b engage with the projections 31 formed on the inner cover 7, whereby the substrate 28 is positioned. The substrate 2
8 (fixed side), a hanging portion 28c is formed integrally with the side edge, and a Hall element 32 as a magnetic sensor is mounted on the hanging portion 28c. The Hall element 32 is located on the side of the engaging portion 17 in the mounted state as shown in FIG. Immediately
As is apparent from FIG. 1, the Hall element 32 is locked.
It was arranged facing the nail 17a. In FIG. 1, reference numeral 34 denotes a cylindrical portion formed integrally with the inner cover 7 and located between the engaging portion 17 and the Hall element 32.

As shown in FIG. 5, the Hall element 32 has Hall terminals 35 and 36, and a Hall voltage corresponding to the orthogonal component of the magnetic flux linked to the magnetic flux detecting surface 32a of the Hall element 32 is applied to the Hall terminal 35. , 36. FIG. 6 shows a circuit diagram.
7, an output control circuit 40 comprising an offset circuit 38 and an amplifying circuit 39.
1 and a comparison circuit 42, and further connected to a motor M via a drive circuit 43. When the operating rod 22 moves in the axial direction, the position of the permanent magnet 25 also changes accordingly, whereby the Hall voltage of the Hall element 32 changes,
Correspondingly, the Hall voltage is output to the output control circuit 40 as a position signal indicating the position of the operating rod 22, that is, the tilt position of the mirror 1.

Next, the operation of the above-described device will be described.
First, the angle of the mirror 1 is adjusted according to the driver's preference. This is performed by operating the adjustment switch provided near the driver's seat as described above. Next, one or a plurality of one-touch switches for storage provided near the driver's seat are operated, and the memory circuit 38 stores the Hall voltage at this time.
Next, the stored tilt angle of the mirror 1 is changed due to a change of the driver or entry into the highway, and thereafter, the mirror 1 is stored at its original position, that is, at the position of the driver initially set. Assume that a situation has been attempted to return to the desired position. At this time, a one-touch switch for mirror rotation provided near the driver's seat is operated. Then, the comparison circuit 42 compares the Hall voltage at this time, that is, the Hall voltage when the angle of the mirror 1 is changed and the Hall voltage at the original mirror angle stored in the storage circuit 38 described above. The signals are compared, and a signal is sent to the drive circuit 43 according to the difference. The motor M is operated by this signal, and the operating rod 22 moves until the difference in Hall voltage disappears, that is, until the mirror 1 returns to the stored original angle. Thus, the mirror holder 2 swings and the mirror 1 returns to the original position.

As described above, in this embodiment, the Hall element 3
Numeral 2 is located on the side of the engaging portion 17, that is, on the side of the permanent magnet 25. Specifically, the Hall element 32
Was arranged so as to face the locking claw 17a. Therefore, in a conventional arrangement in which a permanent magnet is arranged at the rear end of the operating rod and a Hall element is arranged at an interval on the extension of the rear end of the operating rod, the permanent magnet and the Hall element are moved along with the axial movement of the operating rod. In this embodiment, the distance between the Hall element 32 and the permanent magnet 25 is always constant, so that the magnetic force of the permanent magnet 25 can be accurately detected. Further, the Hall element 32, the substrate 28, etc.
2, the width of the vehicle mirror device, in particular, the front-rear width of the drive unit 3 (vertical width in FIG. 1) can be reduced.

On the other hand, when adjusting the tilt angle of the mirror 1, when the mirror holder 2 swings around the pivot 8,
Since the operating rod 22 is separated from the pivot 8, the operating rod 2
2 moves in an arc around the pivot 8, and at this time, the operating rod 22
Not only the axial direction, also moves in a radial direction (lateral direction in FIG. 1)
Although it moves , the portion of the operating rod 22 engaged with the engaging portion 17 is prevented from moving in the radial direction by the engaging portion 17. In this embodiment , the Hall element 32 is arranged on the side of the engaging portion 17 , that is, the Hall element 32 is arranged corresponding to a position where the operating rod 22 does not move in the radial direction. nail
17a , the permanent magnet 25 does not approach the Hall element 32 side (from the radial direction of the operating rod 22) when the operating rod 22 moves in the axial direction. Even if it swings, the permanent magnet 25 and the Hall element 3
2 can be kept constant, and stable detection can be performed. In this embodiment, since the operating rod 22 is prevented from moving in the radial direction by the engaging portion 17,
There is no need to provide a guide or the like in order to prevent the operating rod 22 from moving in the radial direction. That is, it is possible to prevent the operating rod 22 from moving in the radial direction using existing components.

[0019]

[Effects of the Invention] As described above, according to the present invention, locking is achieved.
Attach a permanent magnet to the operating rod that tilts around the claw,
Attach the air sensor and change the output signal of the magnetic sensor.
Detect the tilt angle of the mirror holder, and
The operating rod is centered on the locking claw
Keeping the distance of the permanent magnet and the magnetic sensor be retractable leaning at a constant, magnetic force can be accurately detected.
In addition, since the magnetic sensor faces the locking claw, the front-rear width of the device can be reduced. Furthermore , even if the mirror holder is tilted , the operating rod tilts around the locking claw, so that the
By placing the magnetic sensor to thereby position the face, without adding a guide which prevents radial movement of the actuating rod, it can be prevented interval of the magnetic sensor and the permanent magnet to change.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a vehicle mirror.

FIG. 2 is a plan view of a main part of a vehicle mirror;

FIG. 3 is a perspective view of a substrate.

FIG. 4 is a perspective view of a driving member.

FIG. 5 is a wiring diagram of a Hall element.

FIG. 6 is a circuit diagram of the apparatus.

[Explanation of symbols]

1 ... Mirror, 2 ... Mirror holder, 4 ... Fixed side (K
14 ) Driving member, 17: Engaging part, 17a: Lock
Claws, 22 operating rod, 25 permanent magnet, 26 male screw
Groove), 28 ... fixed side (substrate), 32 ... magnetic sensor
(Hall element), M ... Motor.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B60R 1/06

Claims (1)

(57) [Scope of request for utility model registration] 1. A substantially flat mirror holder for supporting a mirror.
One point on the back of the mirror is swingable on the fixed side, and the mirror
The operating rod can be swung freely to another point on the back of the holder
The operating rod to the fixed side and form a male thread on the operating rod.
Then, screw this male screw into the locking claw attached to the fixed side.
Then, rotate this locking claw with the motor on the fixed side.
To move the operating rod back and forth,
Adjusting the tilt angle of the mirror holder while tilting
A permanent magnet attached to the operating rod,
A magnetic sensor is attached to the
Change of the mirror holder to detect the tilt angle of the mirror holder.
And that the magnetic sensor faces the locking claw.
A mirror position detecting device for a vehicle mirror.