JP3045064B2 - Angle displacement mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an angle displacement mechanism, and more particularly to an angle displacement mechanism for finely adjusting a laser beam irradiation angle in optical communication.

[0002]

2. Description of the Related Art Conventionally, in such an angular displacement mechanism, as shown in FIG. 3, two narrow neck portions 11a and 11b are provided on a structural member 11, and the hinge portion of the structural member 11 is provided. One ends of the piezoelectric elements 13 and 14 are fixed to positions corresponding to 11a and 11b with an adhesive 15 or screws.

The other ends of the piezoelectric elements 13 and 14 are
Is fixed with an adhesive 15 or a screw. Structural member 1
2 is provided with through holes 12a and 12b for fixing the angular displacement mechanism to the mounting position.

The angular displacement mechanism is fixed to a mounting position by inserting screws (not shown) into the through holes 12a and 12b of the structural member 12. In this state, a voltage is applied to the piezoelectric elements 13 and 14 to drive the piezoelectric elements 13 and 14.

When a voltage is applied to one of the piezoelectric elements 13 and 14, for example, the piezoelectric element 13, the hinge 11a of the structural member 11 is pushed by the force generated in the piezoelectric element 13, so that the structural member 11 is tilted by the angle Δθ. become.

At this time, the deformation of the structural member 11 occurs at the hinge portion 11a, but by repeating the deformation within the elastic deformation of the structural member 11, a repetitive operation is realized. That is,
The structural member 11 converts the linear displacement Δx of the piezoelectric element 13 into an angular displacement Δθ by deforming the hinge portion 11a.

When the piezoelectric element 14 is driven, the linear displacement .DELTA.x of the piezoelectric element 14 is converted into an angular displacement .DELTA..theta. The above technique is disclosed in Japanese Utility Model Laid-Open No. 3-40896.

[0008]

In the above-described conventional angular displacement mechanism, the linear displacement of the piezoelectric element is converted into the angular displacement by the deformation of the hinge portion corresponding to the driven piezoelectric element. To improve this, the rigidity of the hinge must be reduced.

However, if the rigidity of the hinge portion is reduced, the hinge portion may be shaken by vibration or the like when not operated, so that the rigidity of the hinge portion cannot be reduced so much. That is, if the hinge portion is given rigidity to improve the vibration resistance, the deformation of the hinge portion is reduced, and the angular displacement is reduced.

[0010] Therefore, by fixing the structural member on the side where angular displacement occurs at rest using the vibration-resistant control device, vibration-resistant characteristics when the rigidity of the hinge portion is reduced, that is, when the angular displacement is increased, are maintained. ing. Therefore,
In the conventional angular displacement mechanism, in order to obtain the angular displacement and secure the vibration resistance, the size and weight of the device are increased.

Therefore, an object of the present invention is to solve the above-mentioned problems and to easily obtain angular displacement without increasing the size and weight of the device and to secure vibration resistance. An object of the present invention is to provide an angular displacement mechanism capable of performing the above.

[0012]

According to the present invention, there is provided an angular displacement mechanism for applying a voltage to one of a first piezoelectric element and a second piezoelectric element to convert a linear displacement of the piezoelectric element into an angular displacement. A fixed member fixed to the mounting position, a displacement member that obtains the angular displacement, a low-rigidity hinge member that integrally connects the fixed member and the displacement member,
A first pressing member fixed at one end to the other end of the first piezoelectric element fixed to the fixing member and pressing the displacement member when a voltage is applied to the first piezoelectric element; A second pressing member that is fixed to the other end of the second piezoelectric element that is fixed to a member and that presses the displacement member when a voltage is applied to the second piezoelectric element; comprises a first and second recesses disposed in the contact position of the first and second pressing members each being in contact when a voltage is applied to the first and second piezoelectric elements, vibration resistance Make sure
Voltage is simultaneously applied to the first and second piezoelectric elements.
Applying the displacement member with the first and second pressing members
I am trying to fix it .

Another angular displacement mechanism according to the present invention, in the above structure, wherein each of the first and second pressing members is provided with
The tip of the displacement member is in contact with the first and second concave portions and the tip is
It has a hemispherical projection .

[0014]

[0015]

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the operation of the present invention will be described below.

A portion for converting the linear displacement of the piezoelectric element into an angular displacement is divided into a displacement portion and a pressing member, and the displacement portion and the fixed portion are integrally connected by a low-rigidity hinge portion. by this,
When a voltage is applied to one of the piezoelectric elements, the corresponding pressing member presses the displacement portion to generate an angular displacement, and when a voltage is applied to both of the piezoelectric elements simultaneously, the corresponding pressing members press the respective displacement portions. Therefore, the angular displacement can be easily obtained without increasing the size and weight of the device, and the vibration resistance can be ensured.

That is, the portion for converting the linear displacement of the piezoelectric element into an angular displacement is divided into a pressing member for transmitting the force generated by the piezoelectric element and a displacement portion for converting the linear displacement of the piezoelectric element into an angular displacement. It is possible to ensure the conflicting characteristics between the angular displacement characteristics that require low rigidity and the vibration resistance that requires high rigidity.

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 and FIG. 2 are diagrams showing the configuration of one embodiment of the present invention. 1A is a front view of one embodiment of the present invention, FIG. 1B is a bottom view of one embodiment of the present invention, and FIG. 2 is an enlarged view of a portion A in FIG. 1A. is there.

In these figures, an angular displacement mechanism according to an embodiment of the present invention includes a structural member 1, pressing members 2, 3,
It is composed of piezoelectric elements 4 and 5. The structural member 1 has a displacement portion 1 which is pressed by the pressing members 2 and 3 to generate an angular displacement.
a and a fixing portion 1b for fixing to a mounting position (not shown)
, A low-rigidity hinge portion 1c that integrally connects the displacement portion 1a and the fixed portion 1b, through holes 1d and 1e,
3 are provided with recesses 1f, 1g with which the protrusions 2a, 3a are brought into contact.

One end of each of the piezoelectric elements 4 and 5 is bonded and fixed to a predetermined position of the fixing portion 1b of the structural member 1 with an adhesive 6, and pressing members 2 and 3 are attached to the other ends of the piezoelectric elements 4 and 5, respectively. 6 is fixed by bonding.

In this case, the projections 2a,
3a has a hemispherical tip, and is disposed at a position facing the concave portions 1f and 1g provided in the displacement portion 1a of the structural member 1 and in non-contact with the concave portions 1f and 1g.

In other words, even if the projections 2a and 3a abut against the recesses 1f and 1g when a voltage is applied to the piezoelectric elements 4 and 5 and a linear displacement occurs, no positional slip occurs at the abutting positions. It has become. Also, the projections 2a, 3a
Since there is a gap B between the recesses 1f and 1g,
When one of the projections 2a, 3a contacts the corresponding recesses 1f, 1g and presses the displacement portion 1a, the pressing operation is not hindered by the other.

Accordingly, when an angular displacement is caused in the displacement portion 1a, if a voltage is applied to one of the piezoelectric elements 4 and 5, the pressing members 2 and 3 bonded and fixed to one of the piezoelectric elements 4 and 5 become Δx Just move. Thereby, the protrusion 2
Since the a and 3a come into contact with the concave portions 1f and 1g and press the corresponding portions, angular displacement occurs by Δθ in the displacement portion 1a.

In the above configuration, since the hinge portion 1c connects the displacement portion 1a and the fixed portion 1b with one thin member, the hinge portion 1c is different from the conventional structure in which two hinges are deformed (see FIG. 3). Rigidity is reduced and angular displacement can be easily obtained. Moreover, by adjusting the distance between the hinge portion 1c and the pressing members 2 and 3, the angular displacement of the displacement portion 1a can be easily adjusted.

In the above configuration, when vibration resistance is ensured, a voltage is simultaneously applied to the piezoelectric elements 4 and 5, so that the projections 2a and 3a are both concave portions 1f and 1f.
Since the abutment is in contact with g, the displacement portion 1a is fixed without causing angular displacement. Therefore, vibration resistance can be ensured without using a vibration resistance control device.

As described above, the portion that converts the linear displacement of the piezoelectric elements 4 and 5 into an angular displacement is defined by the displacement portion 1a and the pressing members 2 and 3.
And the displacement portion 1a and the fixed portion 1b are integrally connected by a low-rigidity hinge portion 1c.
When a voltage is applied to one of the piezoelectric elements 4 and 5, the corresponding pressing members 2 and 3 press the displacement portion 1a to generate angular displacement, and when a voltage is applied to both the piezoelectric elements 4 and 5 simultaneously, the corresponding pressing member 2 , 3 respectively press and fix the displacement portion 1a, so that angular displacement can be easily obtained and vibration resistance can be ensured without increasing the size and weight of the device.

That is, the portion that converts the linear displacement of the piezoelectric elements 4 and 5 into an angular displacement is defined by pressing members 2 and 3 that propagate the force generated by the piezoelectric elements 4 and 5 and the linear displacement of the piezoelectric elements 4 and 5 by an angle. By dividing the displacement into the displacement portion 1a that converts the displacement, it is possible to secure mutually conflicting characteristics between the angular displacement characteristics requiring low rigidity and the vibration resistance requiring high rigidity.

[0029]

As described above, according to the present invention, there is provided an angular displacement mechanism for applying a voltage to one of the first and second piezoelectric elements and converting a linear displacement of the piezoelectric element into an angular displacement. A fixed member fixed to the mounting position and a displacement member that obtains angular displacement are integrally connected by a low-rigid hinge member, and one end is connected to the other end of the first and second piezoelectric elements fixed to the fixed member, respectively. By fixing the first and second pressing members that press the displacement member when voltage is applied to the first and second piezoelectric elements, the angular displacement can be easily performed without increasing the size and weight of the device. In addition to this, there is an effect that vibration resistance can be ensured.

[Brief description of the drawings]

FIG. 1A is a front view of an embodiment of the present invention, and FIG. 1B is a bottom view of the embodiment of the present invention.

FIG. 2 is an enlarged view of a portion A in FIG.

3A is a front view of a conventional example, and FIG. 3B is a bottom view of the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Structural member 1a Displacement part 1b Fixed part 1c Hinge part 1f, 1g Depression 2,3 Pressing member 2a, 3a Projection part 4,5 Piezoelectric element

Claims (2)

(57) [Claims] An angular displacement mechanism for applying a voltage to one of a first piezoelectric element and a second piezoelectric element to convert a linear displacement of the piezoelectric element into an angular displacement, wherein the fixing member is fixed at a mounting position. A displacement member that obtains the angular displacement, a low-rigidity hinge member that integrally connects the fixed member and the displacement member, and one end fixed to the other end of the first piezoelectric element having one end fixed to the fixed member A first pressing member for pressing the displacement member when a voltage is applied to the first piezoelectric element, and one end fixed to the other end of the second piezoelectric element fixed to the fixed member, and A second pressing member that presses the displacement member when applying a voltage to the second piezoelectric element, wherein the displacement member is in contact with the first and second piezoelectric elements when a voltage is applied. Disposed at the contact positions of the first and second pressing members. The first and second recesses seen including, in the first and second piezoelectric element when securing the vibration resistance
At the same time, a voltage is applied to move the displacement member to the first and second positions.
An angular displacement mechanism characterized by being fixed by a pressing member . 2. The first and second pressing members each include a front member.
The tip of the displacement member is in contact with the first and second concave portions and the tip is
2. The method according to claim 1, further comprising a hemispherical projection.
Angle displacement mechanism.