JPH092154A - Back mirror - Google Patents

Abstract

PURPOSE: To regulate a mirror angle and remove raindrop through reduction of the number of parts by a method wherein a first stator is arranged in such a state to make surface contact with a stator, a moving body is reciprocatively moved through vibration generated on the contact surface, a second stator is driven non-parallel to the drive direction thereof, and a mirror is inclined by a position angle converting means. CONSTITUTION: A stator 16 is fixed to a vibration insulation rubber 14 fixed facing the mirror 10 of a mirror housing 12, and by applying a high frequency AC voltage on a piezoelectric element 18 arranged at the stator 16, vibration is generated on the surface of the vibration resilient body 20. A moving body 22 linearly driven by vibration generated by the vibration resilient body 20 is arranged at the upper part of the stator 16 and a linear motor comprises the moving body 22 and the stator 16. A mirror holder 26 is supported at the moving body 22 through a support part 24 to convert plane-like movement into inclination of the mirror, and the mirror 10 is attached to the mirror holder 26. As a result, direct variation of an angle to the oblique direction of the mirror is carried out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rearview mirror, and more particularly to a rearview mirror which can adjust an angle of a mirror by using an ultrasonic actuator as a driving source.

[0002]

2. Description of the Related Art Conventionally, in a rearview mirror of a vehicle or the like, an electric drive means for changing a mirror angle is provided in a mirror housing, and a driver remotely adjusts the angle of the mirror. The ones that can be used have been widely used.

As a rearview mirror of this type, for example, a door mirror according to Japanese Utility Model Laid-Open No. 63-189749 is disclosed, and like this door mirror, generally a DC electromagnetic motor has been widely used as a driving means of the mirror. .

However, the door mirror of the type in which the angle of the mirror is adjusted by using the DC electromagnetic motor has a problem that it has a large number of constituent parts and is expensive.

That is, this conventional door mirror has two electromagnetic motors for individually adjusting the vertical angle and the horizontal angle of the mirror. Further, each electromagnetic motor, gears for decelerating the rotation of the motor and increasing the torque, a male screw member and a drive screw provided for converting the rotational movement of the motor into a linear movement,
It was linked to the etc.

Therefore, the conventional door mirror has a large number of parts, and it is difficult to reduce the manufacturing cost.

Further, it is very difficult to accommodate many of these members in the limited space inside the mirror housing, and the conventional door mirror also has a problem in this respect.

Further, in recent years, a rearview mirror having an ultrasonic actuator in a mirror housing and capable of dropping raindrops adhering to the mirror surface of the rearview mirror by ultrasonic vibration is becoming popular.

However, when the conventional rearview mirror which can adjust the angle of the mirror described above is provided with this raindrop removing function, many members are already incorporated in the mirror housing, and therefore ultrasonic waves for removing raindrops are further added. Incorporating an actuator was very difficult.

The present invention has been made to solve the above-mentioned conventional problems, and its purpose is to have a mirror angle adjusting function and a raindrop removing function, reduce the number of parts and reduce the cost. To provide.

[0011]

In order to solve the above-mentioned conventional problems, the invention according to claim 1 is a rear-view mirror, wherein the mirror is held so as to be tiltable in all directions from a reference plane and changeable in angle. , A movable body that moves on a plane substantially parallel to the reference plane, and is provided so as to make surface contact with the movable body, and the movable body is linearly reciprocally driven in a predetermined direction by vibration generated on the contact surface. Is provided so as to make surface contact with the first stator and the moving body, and the moving body is linearly moved in a direction non-parallel to the driving direction of the first stator by the vibration generated on the contact surface. A second stator that is reciprocally driven; a position-angle conversion unit that converts the planar movement of the moving body into a movement that tilts the mirror;
It is characterized by having.

According to a second aspect of the present invention, in the rear-view mirror according to the first aspect, the position-angle converting means prevents the parallel movement of the mirror and allows the tilting of the mirror, and the moving body. And a support portion that is provided on the mirror and that applies a force of parallel movement of the moving body to the mirror and that tiltably supports the mirror.

According to a third aspect of the present invention, in the rear-view mirror according to the second aspect, the restricting portion is provided on a side of the mirror, and the supporting portion is located in a rear surface direction of the mirror rather than the restricting portion. It is characterized in that it is provided at a shifted position.

According to a fourth aspect of the present invention, in the rear-view mirror, a movable body that is connected to the mirror and has a curved surface on the side opposite to the mirror is provided so as to make surface contact with the curved surface of the movable body. The first stator that reciprocally drives the moving body in a predetermined direction along the curved surface by the vibration generated on the surface and the vibration generated on the contact surface are provided so as to make surface contact with the curved surface of the moving body. And a second stator that reciprocally drives the moving body along the curved surface in a direction that is not parallel to the driving direction of the first stator.

According to a fifth aspect of the present invention, in the rear-view mirror according to the fourth aspect, there is further provided tilting coupling means which is provided on the movable body and supports the mirror so that the angle of the mirror can be freely changed. It is characterized in that it is attached to the movable body through a coupling means.

According to a sixth aspect of the present invention, in the rearview mirror according to any of the first to fifth aspects, the driving directions of the first stator and the second stator are orthogonal to each other. And are arranged in a cross shape.

According to a seventh aspect of the present invention, in the rear-view mirror according to any one of the first to fifth aspects, the first stator comprises a pair of first driving portions whose driving directions are parallel to each other, The second stator is composed of a pair of second driving parts whose driving directions are parallel to each other, and includes the first driving part and the second driving part.
The drive unit is arranged at a right angle.

According to an eighth aspect of the invention, in the rearview mirror according to any one of the first to seventh aspects, the moving body is caused by vibration generated by at least one of the first stator and the second stator. It is characterized in that the mirror is vibrated via.

[0019]

According to the invention described in claim 1, the first stator and the moving body constitute a linear vibration motor which moves in a predetermined direction, and the second stator and the moving body Constitutes a vibration motor that moves in the other direction.
With the first stator and the second stator configured as moving means in these two non-parallel directions, the moving body can move in a plane parallel to a predetermined reference plane.

Then, the position of the moving body in the parallel plane is converted into the deviation of the angle of the mirror by the position angle converting means.

With this arrangement, the angle of the mirror in the rearview mirror can be adjusted by using the ultrasonic actuator.

According to the second aspect of the present invention, the parallel movement of the mirror is restricted by the restricting portion, but the restricting portion allows tilting of the mirror. For this reason, when the force of the parallel movement of the moving body is applied to the mirror by the support portion, the mirror is allowed to move in this direction because the only allowable movement of the mirror is tilting.

According to the third aspect of the present invention, when the moving body tries to move in parallel, the side portion of the mirror comes into contact with the regulating portion. At this time, in the present invention, since the point of action of the moving body to apply the force of parallel movement to the mirror is at a position displaced in the rear surface direction of the mirror from the restriction portion provided on the side of the mirror, A moment is generated in the mirror.

For this reason, when the moving body moves in parallel, the angle of the mirror is changed and the mirror is driven, so that the planar movement of the moving body can be converted into the movement of inclining the mirror.

According to the invention of claim 4, since the contact surface of the moving body with the first or second stator is formed to be a curved surface, the moving body follows the curved surface. It is possible to move while changing its direction spatially in a direction. Therefore, the mirror connected to the moving body can change its angle according to the direction of the moving body.

According to a fifth aspect of the present invention, the mirror is connected to and supported by the movable body through the tilt coupling means. Therefore, the mirror angle can be changed by the driving force of the stator, and the angle of the mirror can be manually changed without depending on the driving force of the first or second stator.

According to the sixth or seventh aspect of the present invention, since the driving directions of the moving bodies of the first stator and the second stator are orthogonal to each other, for example, one of the stators moves up and down. It is possible to move in the right and left directions by the other stator.

Then, the angle of the mirror can be changed by the position angle converting means.

According to the invention described in claim 8, the vibration generated by at least one of the first stator and the second stator is transmitted to the mirror through the movable body.

In this way, it is possible to shake off raindrops and the like adhering to the rearview mirror in the rainy weather by using the ultrasonic actuator used for changing the mirror angle without adding an ultrasonic actuator to the structure.

[0031]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the drawings.

First, the structure of the rearview mirror of this embodiment will be described. FIG. 1 is a sectional view showing the rearview mirror of this embodiment.

In the rearview mirror shown in the same figure, the side and rear surfaces of the mirror 10 are covered with a mirror housing 12, and a mechanism for changing the mirror angle and a raindrop removal are provided inside the mirror housing 12. And a mechanism.

Mirror 10 in mirror housing 12
An anti-vibration rubber 14 is adhered and fixed to the inner surface opposite to, and a stator 16 is adhered and fixed to the anti-vibration rubber 14. This stator 16 has a piezoelectric element 18 and a vibrating elastic body 20, and is a mechanism in which vibration is generated on the surface of the vibrating elastic body 20 by applying a high frequency AC voltage to the piezoelectric element 18. The vibration-proof rubber 14 prevents the vibration from being transmitted to the mirror housing 12 side.

On the upper part of the stator 16, a moving body 22 is arranged which is driven linearly by the vibration generated on the surface of the vibrating elastic body 20. The moving body 22 and the stator 16 constitute a so-called linear vibration motor. In addition, a mirror holder 26 is supported on the moving body 22 via a support portion 24 that converts the planar movement of the moving body 22 into a tilting movement of the mirror and transmits the tilting movement of the mirror.
A mirror 10 is attached to the.

FIG. 2 is an exploded perspective view showing the support portion 24. As shown in the figure, the moving body 22 is the mirror 1
On the side where 0 is arranged, a concave portion 2 whose inner surface is a part of the curved surface 2
Eight. A column 30 is provided at the center of the bottom surface of the recess 28.

The moving body 22 of the mirror holder 26
On the side, there is provided a claw portion 32 having a shape in which a spherical shell having a radius of curvature of the side surface of the concave portion 28 of the moving body 22 as its outer diameter is cut into two substantially parallel surfaces to form an annular shape. The outer surface of the claw portion 32 and the inner surface of the concave portion 28 of the moving body 22 are arranged in contact with each other.

Further, the support column 30 provided on the bottom surface of the recess 28 is provided with two spheres whose outer diameter is the inner diameter of the claw portion 32.
A spherical band-shaped pressing member 34 cut out by the surface is inserted, and the outer surface thereof is in contact with the inner surface of the claw portion 32. The pressing member 34 is pressed by a coil spring 36 and a screw 38 provided on the head of the support column 30. The coil spring 36 shown in the figure may be replaced with a leaf spring 40 as shown in FIG.

Further, the mirror holder 26 is provided with a protrusion 42 at its side end, and the protrusion 42 is fitted into a groove 44 provided around the opening of the mirror housing 12 so that the mirror housing of the mirror 10 can be obtained. Next, the stator 16 which is a driving means of the moving body 22 will be described in more detail. FIG. 4 is a perspective view showing a state in which the stator 16 is disassembled, (a) shows the vibrating elastic body 20, and (b) shows a state in which a predetermined electrode is provided on the surface of the piezoelectric element 18.

As shown in these figures, the stator 16
Is a flat and thin piezoelectric element 18 formed in a cross shape using a piezoelectric material such as ceramics, and the piezoelectric element 1
8 has a vibrating elastic body 20 laminated on one side surface, and both are integrally fixed via an adhesive. The stator 16 is fixed on the anti-vibration rubber 14.

The vibrating elastic body 20 shown in FIG. 4A is formed of, for example, a copper alloy so as to efficiently transmit the ultrasonic vibration generated in the piezoelectric element 18. And
By applying a predetermined single-phase AC voltage (driving voltage) to the piezoelectric element 18, a standing wave is generated on the moving body facing surface 46 of the vibrating elastic body 20.

A plurality of protrusions 48 are provided on the moving body facing surface 46 of the vibrating elastic body 20 along the moving direction of the moving body 22.

Each of these protrusions 48 is formed at an intermediate position between the antinode and the node of the standing wave, whereby the protrusion 4 is formed.
8 is configured to drive the moving body 22 in contact with 8 in a linear direction. Details will be described later.

The moving body 22 is provided so as to come into contact with the protruding portion 48 at a predetermined pressure. Therefore, the driving force by the elastic vibration of the ultrasonic waves generated on the surface of the vibrating elastic body 20 is transmitted to the moving body 22, and the moving body 22 is linearly driven in the predetermined direction. A friction material (not shown) may be provided to efficiently transmit the elliptical vibration to the moving body 22. This friction material is adhesively fixed to the vibration elastic body 20 side of the moving body 22.

Further, as shown in FIG. 4B, the piezoelectric element 18 is provided with predetermined electrodes on the surface thereof, and generates a vibration by applying a voltage to them. FIG.
4A and 4B are plan views for explaining the piezoelectric element 18 in more detail. FIG. 7A shows its front surface, FIG. 8B shows its back surface, and FIG.

The surface of the piezoelectric element 18 is shown in FIG.
As shown in (a), surface electrodes 18U, 18D, 18R, 18L, and 18F are provided on the protruding sides of the cross shape,
They are formed, for example, by coating silver, nickel or the like. Furthermore, on the back surface side of the piezoelectric element 18,
Similarly, as shown in FIG. 5B, a front surface electrode 18G that covers the entire back surface of the piezoelectric element is formed.

Further, as shown in FIG. 5C, in the piezoelectric element 18, three polarization regions 18U-1, 18U-2, ... Are provided on each side of the cross shape along the moving direction of the moving body 22. ...
18L-3 is formed, and the feedback area 1 is formed in the center.
8FB is formed. On each side, adjacent polarization regions are formed so that their polarization directions are different from each other. In the figure, the symbols "+" and "-" indicate the poles on the surface side of the piezoelectric element.

The feedback area 18FB is a polarization area for extracting a feedback voltage from the electrode 18F, and information such as frequency and amplitude of vibration generated in the piezoelectric element 18 is extracted, and each of these pieces of information is driven. It is used for various controls such as control and rotation speed control.

Next, the positional relationship between the standing wave generated on the movable body facing surface 46 and the protrusion 48 will be described.

FIG. 6 is an explanatory view showing the operating principle of the stator 16, and is a sectional view taken along the line AA in FIG. 5 (c).

FIG. 6A shows each polarization region and each protrusion 4.
The positional relationship with 6 is shown. As shown in the figure, the protrusions 46 are located on the left side of the polarization regions 18L-1 to 18L-3 in the L phase and the polarization regions 18R-1 to 18R-1.
8R-3 are provided at positions from the right in the figure.

FIG. 6 (b) shows how the moving body facing surface 46 of the stator 22 vibrates when a single-phase AC voltage is applied to the polarization regions 18L-1 to 18L-3 of the piezoelectric element 18. Therefore, as shown in the figure, the first standing wave is generated.

FIG. 6C shows the stator 2 when a single-phase AC voltage is applied to the R-phase polarized region of the piezoelectric element 18.
The state of vibration of the second moving body facing surface 46 is shown. As shown in the figure, when a single-phase AC voltage is applied to the R-phase polarized region, a second standing wave is generated.

As shown in FIGS. 7B and 7C, in the stator 16 of the embodiment, a single-phase AC voltage is applied to the polarized regions 18L-1 to 18L-3 and a polarized region 18R-1 to 18L-1.
When a single-phase AC voltage is applied to 18R-3, the first and second phases having different phases are formed on the moving body facing surface 46 of the stator 16.
A second standing wave vibration occurs. According to the study by the present inventor, it is presumed that this standing wave is generated by bending vibration corresponding to bending of the beam due to vibration of the piezoelectric element 18.

Further, each of the protrusions 48 is in the vicinity of the left side of the antinode of the first standing wave shown in FIG.
It is formed so as to be located at a position (shifted by 5 °). The protrusion 48 is formed so as to be located near the right side of the second standing wave shown in FIG. 4C (position where the phase is shifted by 45 °).

When the moving body 22 is driven leftward in FIG. 6 (a) by using the stator 16 having the above structure,
A single-phase AC voltage is applied to the polarization regions 18L-1 to 18L-3 of the piezoelectric element 18. As a result, the first standing wave ultrasonic vibration as shown in FIG. 6B is generated on the movable body facing surface 46 of the stator 16. At this time, the polarization regions 18L-1 and 18L- in which the pole on the surface side of the piezoelectric element 18 is "+"
When 3 extends, it acts so as to push the moving body 22 leftward in the figure, and when it shrinks, it moves away from the moving body 22. on the other hand,
The protrusion 48 acts so as to push the moving body 22 leftward in the drawing when the polarization region 18L-2 having the negative pole [−] on the surface side of the piezoelectric element 18 extends, and moves away from the moving body 22 when contracting. . In this way, the protrusions of the two groups alternately operate to drive the moving body 22 in the forward direction.

When the moving body 22 is driven rightward in the figure, the polarization regions 18R-1 to 18R-1 to 18-18 of the piezoelectric element 18 are driven.
A single-phase AC voltage may be applied to R-3. As a result, the second standing wave ultrasonic vibration as shown in FIG. 6C is generated in the stator 16. At this time, the protrusion 48 is formed by the “+” polarized region 18R-1 of the stator 16,
When 18R-3 extends, it acts so as to push the moving body 22 to the right in the figure, and when contracting, it separates from the moving body 22. On the other hand, the protrusion 48 acts to push the moving body 22 to the right in the drawing when the “−” polarized region 18R-2 of the stator 16 extends, and separates from the moving body 22 when contracting. In this way, the protrusions of the two groups alternately operate, and the moving body 22 is driven in the reverse direction to the right in the drawing.

As described above, according to the stator 16 of the embodiment, the movable body 22 can be bidirectionally driven in the right and left directions in the figure by switching the polarization region to which the single-phase AC voltage is applied.

Although the above description has been made with respect to the LR direction in FIG. 5C, the stator 16 has the same operation principle in the UD direction as shown in FIG. The moving body 22 can be bidirectionally driven in the vertical direction. Therefore, the moving body 22 moves in the LR direction,
It is possible to move bidirectionally in both the U and D directions.

FIG. 7 shows the moving direction of the moving body 22 and the electrode 1.
It is a table which shows the correspondence with the energization pattern to 8U, 18D, 18R, and 18L. In order to drive the moving body 22 upward in FIG. 5, a high frequency AC voltage is applied to the electrode 18U,
In order to drive it to the lower side, a high frequency AC voltage may be applied to the electrode 18D. Further, in order to drive the moving body 22 to the right side in FIG. 5, a high frequency AC voltage is applied to the electrode 18R,
To drive it to the left, a high frequency AC voltage may be applied to the electrode 18L.

Further, the moving body 22 is composed of the stator 16
It is also possible to move diagonally by combining the driving forces of the respective sides. That is, by applying the high frequency voltage to the electrodes 18R and 18U at the same time, the moving body 22 is driven diagonally upward to the right. Similarly, the moving body 22 applies the high-frequency voltage to the electrodes 18R and 18D at the same time, so that the electrodes 18L and 18U are moved obliquely downward to the right.
A high frequency voltage is applied to the electrodes 18L and 45D at the same time, and a high frequency voltage is simultaneously applied to the electrodes 18L and 18D.

The movement of the moving body 22 is
It is transmitted to incline the mirror 10 via the support portion 24. Specifically, the mirror 10 is driven by the following action.

FIG. 8 is a view showing a state in which the moving body 22 is moved upward by the stator 16 in FIG. In the figure, first, a high frequency AC voltage is applied to the electrode 18U to drive the moving body 22 upward in the figure. At this time, the mirror holder 26 connected to the moving body 22 is
The protrusion 42 forms a groove 44 in the mirror housing 12.
And the parallel movement of the mirror 10 is prevented.

Further, the mirror 10 is connected to the moving body 22 and its movement in the normal direction is suppressed. For this reason,
The degrees of freedom of the mirror 10 are angular only.

Here, a position where the side surface of the concave portion 28 of the moving body 22 extends from the point of action 45 acting on the claw portion 32 of the mirror holder 26 in the acting direction, that is, the direction in which the moving body 22 is about to move, The contact point between the protrusion 42 of the mirror holder 26 and the groove 44 of the mirror housing 12 is displaced from each other, so that the mirror holder 26
Generates a moment in the direction of changing the normal direction of the mirror 10 downward in FIG.

As described above, the angular changes of the moving direction of the moving body 22 and the normal direction of the mirror 10 are opposite to each other, and the mirror 1 moves with respect to the movement of the moving body 22.
0 changes the angle and follows.

In this way, the planar movement of the moving body 22 can be converted into the movement for inclining the mirror 10, so that the user can change the rearview mirror of this embodiment to the electrodes 18U, 18D, 18R and 18L. The angle of the mirror 10 can be easily adjusted by separately operating the drive voltage application.

As described above, in the rearview mirror of this embodiment, the moving body 22 freely moves in a plane substantially parallel to the reference position of the mirror 10 as a driving means for adjusting the angle of the mirror 10. A mirror type ultrasonic motor can be used to adjust the angle of the mirror 10 in all directions.

Therefore, the outer diameter of the rearview mirror can be made smaller than that of the conventional type using a direct current electromagnetic motor as a drive source. Further, according to the study by the present inventors, the number of constituent parts can be reduced to about half as compared with the conventional rearview mirror.

In this way, if the mirror housing of the rearview mirror is miniaturized and used in a vehicle or the like, the blind spot can be reduced and the field of view can be widened from the driver seat using the conventional mirror housing.

Further, in the rearview mirror of this embodiment, the angle of the mirror can be easily changed in the oblique direction. That is, while the conventional angle change of the mirror in the diagonal direction is performed by combining the angle change in the vertical direction and the horizontal direction a plurality of times, in the rearview mirror of the present embodiment, the moving body is set to the reference position of the mirror. Since it is possible to move the mirror in a substantially parallel plane in an oblique direction, the angle of the mirror in the oblique direction can be directly changed.

Further, in the rearview mirror of this embodiment, it is possible to shake off raindrops and the like adhering to the mirror surface by utilizing the vibration generated by the stator.

That is, as shown in FIG.
Is connected to the stator 16 via the mirror holder 26 and the moving body 22, and the ultrasonic vibration generated by the stator 16 is transmitted to the surface of the mirror 10. Therefore, it is possible to remove raindrops adhering to the surface of the mirror 10 without providing a source of ultrasonic vibration for removing raindrops.

Further, in order to drive the stator 16 without changing the angle of the mirror 10 and remove raindrops adhering to the surface of the mirror 10, each electrode 18U, 1 of the stator 16 is removed.
The voltage applied to 8D, 18R, and 18L may be finely switched so that the moving body 22 reciprocates a minute distance.

For example, the electrodes 18R, 1 of the stator 16 are arranged so that the moving body 22 slightly reciprocates left and right.
The voltage may be supplied to 8L alternately. Alternatively, the voltage may be supplied to the electrodes 18R and 18L at the same time so that the force for driving the moving body in the right direction and the force for driving the moving body in the left direction are balanced with each other. In this way, raindrops adhering to the surface of the mirror 10 can be removed by merely changing the angle of the mirror to the extent that the user cannot perceive it.

In this way, the rearview mirror of this embodiment can remove raindrops on the surface of the mirror 10 by using the piezoelectric element 18 for adjusting the angle of the mirror 10 without providing an ultrasonic wave source. I can.

The rear-view mirror is not limited to the above-mentioned form, and various modifications can be made within the scope of the present invention.

FIG. 9 shows a modification of the stator 16,
(A) is a vibration elastic body 2 according to a modification of the vibration elastic body 20.
0b is a perspective view showing the piezoelectric element 18a.
FIG.

The stator shown in these figures includes a piezoelectric element 18a formed in a flat and thin shape using a piezoelectric material such as ceramics, and a vibrating elastic body 20a laminated on one side surface of the piezoelectric element 18a. And both are integrally fixed via an adhesive.

On the moving body facing surface 46a of the vibrating elastic body 20a shown in FIG. 9A, a plurality of protrusions 48a are provided along the moving direction of the moving body 22 on each side of the quadrangular shape. There is.

Further, the piezoelectric element 18 shown in FIG.
a is two kinds of electrodes 51A, 51B, ..., 54 on each side.
A and 54B are alternately provided every three sheets, and a feedback electrode 50F is provided at each corner, and correspondingly,
The piezoelectric element 18a is provided with a plurality of polarization regions.

FIG. 10 is a plan view showing this polarization region, and the positions of the protrusions 48a provided on the vibrating elastic body 20a are shown beside each side of the quadrangular shape.

In the figure, each side of the quadrangle is provided with six polarization regions, and two polarization regions are formed so that the polarization direction of each set is different. For example, the polarization regions 61A (+) and 61B (+) form one set, and the polarization directions are different from those of the adjacent polarization regions 61A (-) and 61B (-). In the figure, reference signs "+" and "-" indicate poles on the surface side of the piezoelectric element, and reference signs "A" and "B" indicate that different drive voltages are applied (hereinafter , The polarization region with the symbol A is referred to as “A-phase polarization region”, and the polarization region with the symbol B is referred to as “B-phase polarization region”. In addition, the feedback area 60FB
Is a polarization region for extracting a feedback voltage from the feedback electrode 50F.

On each side where the polarization region is formed,
The protrusion 48a is provided at a position corresponding to the boundary of each set.

FIG. 11 is an explanatory view showing the operating principle of the stator according to this modification, and FIG. 11 (a) shows the positional relationship between each polarization region and each protrusion 48a. As shown in the figure, the protrusions 48a are provided at positions corresponding to the boundary positions of the polarization regions of the A phase and the B phase in the same polarization direction.

FIG. 11B shows the vibration of the moving body facing surface 46a of the stator when a single-phase AC voltage is applied to the A-phase polarized regions 64A (+) and 64A (-) of the piezoelectric element 18a. The first standing wave is generated as shown in FIG.

FIG. 11C shows the vibration of the moving body facing surface 46a of the stator when a single-phase AC voltage is applied to the B-phase polarized regions 64B (+) and 64B (-) of the piezoelectric element 18a. The second standing wave is generated as shown in FIG.

As shown in FIGS. 9B and 9C, in the stator, a single-phase AC voltage is applied to the A-phase polarization regions 64A (+) and 64A (-) and the B-phase polarization region 64B.
When a single-phase AC voltage is applied to (+) and 64B (-), first and second standing wave vibrations of different phases are generated on the moving body facing surface 46a of the stator.

Further, the protrusion 48a is shown in FIG. 11 (b).
It is formed so as to be located in the vicinity of the right side in the figure with respect to the antinode of the first standing wave shown in FIG. Also, this protrusion 48a
Are formed so as to be located in the vicinity of the left side in the figure with respect to the antinode of the second standing wave shown in FIG.

The moving body 22 is constructed by using the stator having the above construction.
11A in the right direction, a single-phase AC voltage is applied to the A-phase polarized regions 64A (+) and 64A (−) of the piezoelectric element 18a. As a result, the first standing wave ultrasonic vibration as shown in FIG. 11B is generated on the moving body facing surface 46a of the stator. At this time, when the “A +” region extends, it acts so as to push the moving body 22 to the right in the figure, and when it shrinks, it moves away from the moving body 22. On the other hand, the protrusion 48a acts so as to push the moving body 22 to the right in the figure when the "A-" region of the stator extends, and separates from the moving body 22 when contracting. In this way, the protrusions 48a of the two groups alternately operate to drive the moving body 22 in the forward direction.

When the moving body 22 is driven to the left in the drawing, the B-phase polarized region 64B of the piezoelectric element 18a is also used.
A single-phase AC voltage may be applied to (+) and 64B (-). As a result, the stator shown in FIG.
The second standing wave ultrasonic vibration as shown in FIG. At this time, the protrusion 48a acts to push the moving body 22 leftward in the drawing when the "B +" region of the stator extends, and separates from the moving body 22 when contracting. On the other hand, the protrusion 48a acts so as to push the moving body 22 leftward in the drawing when the "B-" region of the stator extends, and separates from the moving body 22 when contracting. In this way, the protrusions 48a of the two groups alternately operate, and the moving body 22 is driven in the reverse direction to the left in the drawing.

Thus, according to the stator of the embodiment,
By switching the polarization region to which the single-phase AC voltage is applied, the moving body 22 can be bidirectionally driven in the right direction and the left direction in the drawing.

FIG. 12 is a table showing the correspondence between the moving direction of the moving body 22 and the method of energizing the electrodes. Moving object 2
2 are driven to the upper side in FIG.
In order to apply a high frequency AC voltage to B and drive it to the lower side, a high frequency AC voltage may be applied to the electrodes 51A and 53A. Further, in order to drive the moving body 22 to the right side in FIG. 10, a high frequency AC voltage may be applied to the electrodes 52A and 54A, and to drive it to the left side, a high frequency AC voltage may be applied to the electrodes 52B and 54B.

Further, the moving body 22 can be moved in an oblique direction by combining driving means on each side. That is, by applying the high frequency voltage to the electrodes 51B and 52A at the same time, the moving body 22 is driven diagonally upward to the right. Similarly, the moving body 22 has electrodes 51A and 52A.
To the electrodes 51B and 52B simultaneously by applying a high-frequency voltage to the electrodes 51B and 52B at the same time to the left, and at the same time to the electrodes 51A and 52B by simultaneously applying a high-frequency voltage to the left and below the electrodes. Driven in each direction.

Even if the stator having the above-described structure and operation is used in place of the stator 16, the rearview mirror of this embodiment can be suitably driven.

Further, in the above rearview mirror, the stator 16 is attached to the mirror housing 12 via the antivibration rubber 14, but the present rearview mirror may be directly attached to the vehicle in order to be attached to the vehicle or the like. .

FIG. 13 is a diagram showing a modification of the mounting of the rearview mirror of this embodiment. In the figure, the stator 16 is fixed to a bracket 52 mounted on the vehicle side via a vibration-proof rubber 14. Even in this case, the present rearview mirror can be properly attached.

Further, in the above rearview mirror, the moving body 22
Although no means for pressing the stator 16 is provided, it is preferable to attach the spring 56 to the guide 54 fixed to the mirror housing 12 to press the moving body 22 against the stator 16 as shown in FIG. The spring 56 is not fixed to the side of the stator 16 but slides while being in pressure contact when the stator 16 moves.

FIG. 15 is a diagram showing still another modification of the rearview mirror of this embodiment. In the rearview mirror according to FIG. 1, the stator 16 and the moving body 22 are in flat surface contact with each other, whereas in the rearview mirror shown in FIG. 1, the stator 60 and the moving body 62 are in curved surface contact with each other. doing.

For this reason, the contact surface of the moving body 62 with the stator 60 is formed as a spherical contact surface 64 which is a part of the spherical surface. On the other hand, in the vibration elastic body 66 of the stator 60, the length of the projecting portion 68 gradually increases from the center toward the outside as compared with the vibration elastic body 20 of the stator 16, so that the spherical contact surface of the moving body 62. It is characterized in that it is formed so as to contact 64.

The supporting portion 24 provided on the rearview mirror according to FIG. 1 is also used as the tilt coupling means 70 in this modification. The projection 42 is not provided around the mirror holder 72 unlike the mirror holder 26, and the groove 44 is not provided around the opening of the mirror housing 74 like the mirror housing 12. Then, the mirror holder 72 is configured so as not to contact the mirror housing 74.

Since the other members are the same as those of the rearview mirror according to FIG. 1, the same reference numerals are given and the description thereof will be omitted.

In the rearview mirror of this modification having the above-described structure, when the stator 60 is activated and the moving body 62 is driven, the moving body 62 is projected by the projection 68 of the stator 60.
Move while touching. In this modification, since the mirror holder 72 is configured not to contact the mirror housing 74, the tilt coupling means 70 tiltably holds and couples the mirror holder 72 and the movable body 62. Even if the moving body 62 is driven, no force acts on the mirror holder 72, so that the mirror holder 72 moves integrally with the moving body 62.

Therefore, in the rearview mirror of this modification, when the moving body 62 moves, the angle of the mirror held by the moving body 62 is changed.

Here, the tilt coupling means 70 can change the tilt angle of the mirror holder 72 only manually, and it is possible to manually deal with an unexpected situation such as an electrical failure of the stator 60. It has the effect that

As described above, the stator 60 and the moving body 62 are
The moving body 62 can also be converted into the tilt of the mirror 10 by forming the contact surface with the spherical surface.

[0107]

As described above, according to the present invention,
Mirror angle adjustment using the first and second stators,
And raindrop removal can be easily performed. Furthermore, the number of parts can be relatively small, and the cost can be reduced.

[0108]

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a rearview mirror of this embodiment.

FIG. 2 is a perspective view showing a position angle conversion means of a rearview mirror of this embodiment.

FIG. 3 is a cross-sectional view showing a modified example of the position angle conversion means of the rearview mirror of this embodiment.

FIG. 4 is an exploded perspective view showing a stator of the rearview mirror of this embodiment.

5A and 5B are plan views showing a piezoelectric element of the rearview mirror of the present embodiment, where FIG. 5A shows a state where electrodes are provided on the front surface, and FIG. 5B shows a state where electrodes are provided on the back surface,
(C) shows the polarization region.

FIG. 6 is an explanatory view showing the operating principle of the stator of the rearview mirror of this embodiment.

FIG. 7 shows the correspondence between the moving direction of the moving body of the rear-view mirror of this embodiment and the electrodes to which a voltage should be applied.

FIG. 8 is a sectional view showing the operation of the rearview mirror of this embodiment.

FIG. 9 is an exploded perspective view showing a modification of the stator of the rearview mirror of this embodiment.

FIG. 10 is a plan view showing a modification of the piezoelectric element of the rearview mirror of this embodiment.

FIG. 11 is an explanatory diagram showing an operating principle of a stator according to a modification of the rearview mirror of the present embodiment.

FIG. 12 shows the correspondence between the moving direction of the moving body of the rearview mirror of this embodiment and the electrodes to which a voltage is applied in the stator according to the modification.

FIG. 13 is a cross-sectional view showing a modification of the mounting of the rearview mirror of this embodiment.

FIG. 14 is a cross-sectional view showing an example of pressing a movable body against a stator in the rearview mirror of this embodiment.

FIG. 15 is a diagram showing still another modification of the rearview mirror of this embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Mirror 16 Stator (1st stator, 2nd stator) 18a, 20a Stator (1st drive part, 2nd drive part) 22 Moving body 24 Support part 44 Groove (regulation part) 45 Action point 64 Spherical contact surface ( Curved surface) 70 Inclined connection means

Front Page Continuation (72) Inventor Susumu Hashimoto 390 Umeda, Kosai City, Shizuoka Asmo Stock Company In-house

Claims (8)

[Claims] 1. A rear-view mirror, wherein the mirror is held so as to be tiltable in all directions from a reference plane and capable of changing an angle, a moving body that moves on a plane substantially parallel to the reference plane, and the moving body. A first stator which is provided so as to make surface contact with the movable body and linearly reciprocally drives the movable body in a predetermined direction by the vibration generated at the contact surface; and a contact which is provided so as to make surface contact with the movable body The second stator linearly reciprocatingly drives the moving body in a direction non-parallel to the driving direction of the first stator by the vibration generated on the surface, and the planar movement of the moving body by the mirror. A rear-view mirror, comprising: a position-angle conversion unit that converts into a tilting motion. 2. The rear-view mirror according to claim 1, wherein the position-angle conversion means is provided in the movable body and a restricting portion that prevents the mirror from moving in parallel and allows the mirror to tilt. A rear-view mirror, comprising: a support portion that applies a force of parallel movement of a body to the mirror and that tiltably supports the mirror. 3. The rearview mirror according to claim 2, wherein the restricting portion is provided on a side of the mirror, and the supporting portion is provided at a position displaced from the restricting portion in a rear surface direction of the mirror. A rearview mirror that is characterized by that. 4. In a rearview mirror, a moving body that is connected to the mirror and has a curved surface on the side opposite to the mirror, and is provided so as to make surface contact with the curved surface of the moving body. A first stator that reciprocally drives the moving body in a predetermined direction along the curved surface is provided so as to make surface contact with the curved surface of the moving body, and the moving body is moved by the vibration generated on the contact surface. A second mirror that reciprocally drives along a curved surface in a direction that is not parallel to the driving direction of the first stator, the rearview mirror. 5. The rearview mirror according to claim 4, further comprising a tilt coupling means provided on the movable body and supporting the mirror so that the angle of the mirror can be freely changed, and the mirror includes the tilt coupling means through the tilt coupling means. A rearview mirror that is attached to a moving body. 6. The rearview mirror according to claim 1, wherein the driving directions of the first stator and the second stator are orthogonal to each other and are arranged in a cross shape. Rearview mirror characterized by being. 7. The rearview mirror according to claim 1, wherein the first stator includes a pair of first driving portions whose driving directions are parallel to each other, and the second stator includes A rear-view mirror, comprising a pair of second driving units whose driving directions are parallel to each other, wherein the first driving unit and the second driving unit are arranged at a right angle. 8. The rearview mirror according to any one of claims 1 to 7, wherein the vibration is generated by at least one of the first stator and the second stator, and the mirror is moved through the moving body. A rearview mirror characterized by vibrating.