JP2576870Y2 - Mirror angle detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a mirror angle detecting device such as a vehicle rearview mirror.

[Related Art] In recent years, in order to simplify the operation of driving an automobile, the swing angle of a rearview mirror can be adjusted by operating a switch provided around a driver's seat. This switch is a multi-directional switch, and when any one direction is selected and moved, the motor in the actuator assembly in the mirror body is driven to change the swing angle of the mirror up, down, left and right by any angle. . For example, Japanese Unexamined Utility Model Publication No. 63-85544 discloses that a permanent magnet is embedded inside a movable pivot for driving in a vehicle width direction (horizontal direction) and a vertical swing angle protruding from an actuator assembly, and a back surface of a mirror boulder in a mirror assembly is provided. There has been proposed an apparatus for detecting a swing angle of a mirror by arranging a magnetic detection element in the mirror.

[Problem to be Solved by the Invention] When the magnetic sensing element is fixed to the mirror assembly side and the mirror assembly is driven as in the above-mentioned Japanese Unexamined Patent Publication, the lead wire of the magnetic sensing element is repeatedly bent, so that a break in the conducting wire occurs. There is a possibility that. Further, if a magnet is fixed in the pivot ball portion, it is difficult to manufacture. Further, it is difficult to shorten the distance between the permanent magnet and the magnetic detection element, and it is not possible to obtain a sufficient magnetic flux density, the gain of the amplifier is increased, the temperature characteristics are poor, and the magnetic field is easily affected.

SUMMARY OF THE INVENTION An object of the present invention is to provide a mirror angle detection device that can eliminate disconnection due to repeated bending of a lead wire of a magnetic detection element and can improve detection accuracy by bringing a permanent magnet and a magnetic detection element closer to each other. .

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a permanent magnet on a pivot plate, which is detachably fitted to the back surface of a mirror holder, on a side opposite to a movable pivot across a fulcrum. It is fixed and a magnetic detection element such as a Hall element is provided on the mirror angle adjustment actuator unit side. The pivot plate serves as the drive unit of the mirror assembly, and fixes the permanent magnet in the vertical and horizontal directions centering on the fulcrum plane, and detects the vertical and horizontal angle on the actuator unit side near this permanent magnet. Two magnetic detecting elements are provided.

[Operation] When the multi-directional changeover switch in the vehicle interior is operated and moved in an arbitrary direction, the motor in the actuator assembly is driven, and the tilt (swing angle) of the mirror in the vertical and horizontal directions can be adjusted. Changes in magnetic flux density are detected by the magnetic detecting elements in the vertical and horizontal directions according to the inclination of the mirror assembly at this time, and the outputs are input to a control device (computer) to store the swing angle of the mirror at that time. In advance, when the driver again gets on the seat, the swing angle in the predetermined mode is automatically set.

[Example] Next, the present invention will be specifically described with reference to the drawings. First
FIG. 2 is an exploded perspective view of a part of an electric remote control rearview mirror provided with a mirror angle detecting device of the present invention, and FIG. 2 is II-I of FIG.
It is sectional drawing in the I line.

The electric remote control rearview mirror 10 includes a mirror base 11 and
A mirror body 12, which is rotatably mounted on a mirror base 11, an electric storage mechanism 13 for the mirror body 12, a mirror assembly 14, and an actuator assembly 15 for adjusting the swing angle of the mirror are constituted as main parts. I have.

Although the details of the electric storage mechanism 13 are not shown, the electric storage mechanism 13 includes a motor for the electric rating on the upper portion of the shaft provided on the projecting portion of the mirror base 11, a reduction gear train provided around the shaft, and position detecting means. The mirror body 12 is rotated from a standing position to a storage position by driving a motor for rating. The mirror assembly 14 includes a mirror 16 and a mirror holder.
17 and a pivot plate 18 removably fitted in an opening formed in the mirror holder 17. As shown in FIGS. 1 and 2, the pivot plate 18 includes an engaging projection group 19 provided near the four corners of the plate, a hollow spherical trapezoidal pivot 20 formed substantially at the center of the plate, and a central socket 20. It has movable sockets 21 and 22 formed in the horizontal and vertical directions about the center, and permanent magnets 23 and 24 fixed to the plate edge on the side facing the movable sockets 21 and 22.

The actuator assembly 15 includes a rear housing 25
And the front housing 26.
27 (only one motor is shown in FIG. 3), and a drive transmission 28 for converting the rotation of the motor into the forward and backward (up and down in FIG. 2) movement of the movable pivots 31 and 32.
And built-in. On the outer surface of the rear housing 25, a large-diameter concave spherical socket 29 that fits into the pivot 20 on the pivot plate 18 side is formed, and a hemispherical cap is formed in the pivot 20.
33 is inserted and tightened with a tapping screw 34. A magnetic detection element 36 such as a Hall element is arranged at the edge of the rear housing 25, and an amplifier board (PC board) 38 including an amplification circuit of the magnetic detection element 36 is provided on the front wall of the front housing 26.
Are arranged and fixed, and the PC board 38 and the magnetic detection element 36 are connected by a lead wire 35.

When Hall elements are used as the magnetic detecting elements 36 and 37, as shown in the principle diagram of FIG. 4, a change in the relative position between the permanent magnet and the Hall element is detected as a change in magnetic flux density in an analog or digital manner. Is what you do.

When a current Ic is applied to the Hall element H and a magnetic field B is applied in the vertical direction, the current and the magnetic field generate a voltage VH in the vertical direction.

VH = KH.Ic.B where VH: voltage, B: magnetic flux density, Ic: control current, KH: product sensitivity (a constant determined by the semiconductor element material) Therefore, the magnetic flux is obtained by changing the inclination of the permanent magnet while keeping the current constant. The density changes and the output changes.
In FIGS. 5A to 5C, when the mirror is in the neutral position, when the mirror is set on the right side, and when the mirror is set on the left side, the voltage VH is as shown in FIG. Since VH generates only a few mV, an output as shown in FIG. 7 is obtained by amplifying and shifting.

Operation I. Horizontal adjustment and output detection The rotation of the worm 41 fixed to the output shaft of the horizontal swing angle drive motor 27 in the actuator assembly 15 is transmitted to the worm wheel 42, and the pivot screw
43 rotates (FIGS. 2 and 3). Pivot screw
With the rotation of 43, the movable pivot 31 (or 32) at the upper end of the adjustment nut 44 moves, and the central pivot becomes a fulcrum.
The mirror assembly 14 fixed to the pivot plate 18 moves about the center 20 so that the mirror angle can be adjusted in the left-right direction.

Horizontal angle sensor (magnetic detection element) 36 is rear housing 25
, And the magnetic flux density B changes as the mirror assembly 14 moves, and a minute output change is detected. The output is amplified by an amplifier board 38 fixed to the front housing 26, and a control device (computer system) not shown is shown.
Output to

II. Vertical adjustment and output detection The worm fixed to the output shaft of the vertical swing angle drive motor rotates and performs the same operation as horizontal adjustment to perform vertical adjustment.

The magnetic detection element 37, which is a vertical angle sensor, detects an output in the same manner as in the left-right direction, amplifies it with an amplifier board 38, and inputs it to the computer.

FIG. 8 is a circuit diagram of a mirror angle detection circuit for detecting a horizontal angle. The configuration for detecting a vertical angle has exactly the same configuration.

When a constant current Ic flows through the Hall element H, a voltage corresponding to the change in the magnetic flux density B is amplified via the amplifier IC1,
Is output.

Although the above description has been made with respect to the side mirror, the swing angle can be detected by providing a similar sensor for the inner mirror. That is, as shown in FIG. 9, an actuator assembly 51 for adjusting a mirror angle is provided in a mirror body 50 of an inner mirror, and two independent motors are used to adjust the vertical and horizontal mirror angles. The inner mirror includes a mirror assembly 52, an actuator assembly 51, a frame 53, a body 50 with a visor 54, a lower cover 55, an upper cover 56, a stay 57, and the like. The actuator assembly 51 has the same horizontal and vertical magnetic detecting elements 36 and 37 as the door mirror shown in FIG. 1 and the following, and has a function of detecting and outputting a swing angle. In addition, by providing the mirror assembly 52 as an ECM (electrochromic mirror) and providing the ECM control board 58, an automatic anti-glare function can be provided. Like the door mirror described above, the inner mirror also incorporates a "vertical angle sensor" and a "horizontal angle sensor" using permanent magnets and magnetic detection elements, amplifies the detected output with an amplifier board, and inputs the output to the computer. . In the computer, the detected value is stored, for example, when the same driver is seated again, the computer is operated by pressing a key of a predetermined mode to give an approximate swing angle, and an operation switch is provided as necessary. Is finely adjusted arbitrarily.

[Effects of the Invention] As described above, in the present invention, the permanent magnet is fixed to the pivot plate of the mirror assembly, and the magnetic detection element is set on the actuator assembly side for changing the mirror angle. Since the lead wire is not connected by mounting the lead wire, there is no risk of disconnection due to repeated bending of the lead wire, and the relative proximity position between the permanent magnet and the magnetic sensing element can be set accurately, resulting in improved temperature characteristics. In addition, the effect of a magnetic field from the outside can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a part of a mirror assembly and an actuator assembly of the mirror angle detecting device of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. FIG. 4 is a partially cutaway front view showing the positional relationship between the plate and the actuator assembly, FIG. 4 is a perspective view of the magnetoelectric detecting element, FIGS. 5A to 5C are schematic front views showing the inclination of the mirror and the direction of the magnetic flux, 6 is a characteristic diagram of the magnetic sensing element, FIG. 7 is a diagram showing the relationship between the swing angle of the mirror and the output voltage of the magnetic sensing element, FIG. 8 is a detection circuit diagram,
FIG. 9 is a partially cutaway perspective view when the present invention is applied to an angle detection device for an inner mirror. 10 ... conducting remote control rearview mirror, 11 ... mirror base, 12 ... mirror body, 13 ... conducting storage mechanism, 14 ...
Mirror assembly, 15 …… actuator assembly,
16… Mirror, 17… Mirror holder, 18… Pivot plate, 20… Pivot, 21,22 …… Moving socket, 23,
24: permanent magnet, 36, 37: magnetic detection element, 38: amplifier board.

Claims (1)

(57) [Scope of request for utility model registration] A pivot plate disposed on the back side of the mirror surface and tilting with the mirror surface; and a pivot plate disposed on the back side of the pivot plate, pivotally supporting the pivot plate at a center position so as to be tiltable, and having a pivot plate surface. A rear housing in which a movable pivot is disposed on each of the upper horizontal and vertical axes; a drive device that tilts the pivot plate in horizontal and vertical directions by moving the movable pivot forward and backward; A rear housing having a front housing that covers the driving device and that is disposed on a rear surface side of the housing, the mirror angle detecting device detecting the mirror surface angle, wherein each of the movable pivots on the pivot plate surface is mounted. Permanent magnet attached to the opposite side of the center position from the specified position, A magnetic detecting element that is disposed at a position near the permanent magnet on the edge of the rear housing and that can be attached from the back side of the mirror surface, and that detects a change in a magnetic field caused by tilting of the pivot plate; A PC board disposed on the back side of the housing, and having an electric circuit surface facing the back side, connected to the magnetic detection element and processing a detection signal by the magnetic detection element. Angle detector.