JPH064080Y2 - Piezoelectric fan - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a piezoelectric fan having a structure in which an elastic thin plate is excited and blown by utilizing the piezoelectric effect of a piezoelectric bimorph oscillator. For example, in local air cooling in various electronic devices. It relates to a suitable blower.

2. Description of the Related Art By the way, a piezoelectric bimorph vibrator is, as shown in FIG. 4, provided with electrodes on both sides of a plate-shaped piezoelectric material such as ceramic, and polarized the piezoelectric elements 1a and 1b so that the polarization axes A thereof face each other. Then, a thin metal plate 2 is sandwiched between them to form a bimorph structure, a positive potential is applied to the lead wire 3 soldered to one of the electrodes on one side, and a lead wire soldered to one of the electrodes on the other side. When a negative potential is applied to 4, the piezoelectric bimorph oscillator 5 having the above structure bends as shown by the dotted line. When a potential opposite to the above is applied to the lead wires 3 and 4, the lead wires 3 and 4 bend in opposite directions. Therefore, the lead wire 3,
The piezoelectric bimorph vibrator 5 can be vibrated by applying an alternating voltage between the four electrodes, and the piezoelectric fan utilizes this action.

Conventionally, this type of piezoelectric fan has a structure as shown in FIG. In FIG. 5, reference numeral 5 denotes a piezoelectric bimorph oscillator in which the metal thin plate 2 is sandwiched between the pair of plate-shaped piezoelectric elements 1a and 1b as described above, and one end of the metal thin plate 2 that constitutes the piezoelectric bimorph oscillator 5 is shown. The elastic thin plates 6 are attached to each other in a linear shape to form a pair, and the other ends of the two elastic thin plates 6 are cantilevered and fixedly supported by the supporting portion 7 in a V shape. There is. Then, when an AC drive voltage is applied to the pair of prepared piezoelectric elements 1a and 1b through the lead wires 4 and 5, the piezoelectric bimorph vibrators 5 vibrate in opposite directions to each other, which causes The wind obtained by vibrating the tip of the elastic thin plate 6 was used. At this time, the piezoelectric bimorph vibrator 5
The vibrations of the support parts 7 are suppressed by vibrating the parts in opposite directions.

Problems to be Solved by the Invention In such a configuration, a pair of bimorph oscillators are used.
A single piezoelectric element and two thin metal plates are required, and structurally, the piezoelectric bimorph vibrator and the elastic thin plate are arranged in a straight line, which takes up a very large space, and the cantilevered support is a piezoelectric bimorph. There was also a problem in terms of the number of parts, workability, and shape, such as the need to firmly fix the vibrator so that it would not escape.

The present invention solves such a problem, is very compact, can reduce the number of parts, and has good workability.
An object of the present invention is to provide a piezoelectric fan whose characteristics (amplitude) can be stabilized.

Means for Solving the Problems In order to solve this problem, the present invention holds a pair of plate-shaped piezoelectric elements and a thin metal plate having both ends bent in the same direction between the piezoelectric elements. A piezoelectric bimorph vibrator is provided, and elastic thin plates are attached to the bent portions at both ends of the metal thin plate, and the central portion of the piezoelectric bimorph vibrator is supported by a support portion in a direction orthogonal to the bent portion direction of the metal thin plate. It is fixedly supported.

Operation According to this configuration, the piezoelectric bimorph oscillator is provided between the piezoelectric elements, and a thin metal plate having both ends bent in the same direction in a U-shape is sandwiched, and elastic thin plates are provided at the bent portions at both ends of the thin metal plate. And by virtue of the structure in which the central portion of the piezoelectric bimorph oscillator is fixedly supported by the support portion in the direction orthogonal to the bending portion direction of the metal thin plate, the two elastic thin plates are vibrated at the same time by the pair of piezoelectric elements. In addition, since the node of the tawami vibration of the piezoelectric bimorph oscillator is fixed, it is easy to support. Furthermore, by locating the piezoelectric bimorph oscillator and the elastic thin plate at a substantially right angle, very little space is required. .

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a configuration diagram showing a first embodiment of the piezoelectric fan of the present invention. In FIG. 1, reference numeral 8 denotes a piezoelectric bimorph vibration which is formed by sandwiching a pair of plate-shaped piezoelectric elements 9a and 9b and a thin metal plate 10 between the piezoelectric elements 9a and 9b, which are bent at both ends in a U-shape in the same direction. Is a child. The elastic thin plates 1 are formed on the bent portions at both ends of the metal thin plate 10 constituting the bimorph oscillator 8.
1 is attached, and the central portion of the piezoelectric bimorph oscillator 8 is fixedly supported by a supporting portion 12 in a direction orthogonal to the bending portion direction of the metal thin plate 10. Then, the piezoelectric element 9
When an AC voltage is applied to the lead wires 13 and 14 soldered a and 9b, the piezoelectric bimorph vibrator 8 and the elastic thin plate 11 vibrate in the direction of the arrow with the support portion 12 as a node.

According to this embodiment, a piezoelectric bimorph vibrator 8 is sandwiched between a pair of piezoelectric elements 9a and 9b, and a metal thin plate 10 having both ends bent in the same direction in a U-shape is sandwiched between the piezoelectric thin plates 10. Elastic thin plates 11 are attached to the bent portions at both ends of the piezoelectric bimorph oscillator 8 and the central portion of the piezoelectric bimorph vibrator 8 is attached to the metal thin plate 1.
With the structure in which the support portion 12 is fixed and supported in the direction orthogonal to the bending portion direction of 0, the two elastic thin plates 11 can be simultaneously vibrated by the pair of piezoelectric elements 9a and 9b, and the piezoelectric bimorph vibrator 8 It is easy to support because it fixes the nodes of vibration. Further, by arranging the piezoelectric bimorph vibrator 8 and the elastic thin plate 11 at a substantially right angle, a very small space is required.

(Embodiment 2) FIG. 2 is a block diagram showing a piezoelectric fan of a second embodiment according to the present invention. In this embodiment, as shown in FIG. Convex part 15 in the center
Is provided, and the convex portion 15 is fitted into a concave portion (not shown) formed in the support portion 12 and attached by adhesion or the like, so that in addition to the operation in the first embodiment, the piezoelectric bimorph vibrator 8 The supporting position can be easily and accurately determined.

(Embodiment 3) FIG. 3 is a block diagram showing a piezoelectric fan according to a third embodiment of the present invention. In this embodiment, the convex portion 15 shown in FIG. 2 is used.
By providing the hole portion 16 or the U-shaped notch 17 in the support portion, it is possible to easily and stably fix the support position simply by using the support portion (not shown) and tightening them with a screw or the like. It is a thing.

As described above, according to the present invention, a pair of plate-shaped piezoelectric elements,
Between the piezoelectric elements, a piezoelectric bimorph oscillator comprising a metal thin plate having both ends bent in the same direction in a U-shape is sandwiched, and elastic thin plates are attached to the bent portions at both ends of the metal thin plate.
Further, by fixing and supporting the central portion of the piezoelectric bimorph oscillator in the direction orthogonal to the bending portion direction of the thin metal plate by the supporting portion, it is very compact and the number of parts can be reduced,
Further, the workability is good, and various effects such as stabilizing the characteristic (amplitude) can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of a piezoelectric fan according to the present invention, FIG. 2 is a block diagram showing a piezoelectric fan of a second embodiment according to the present invention, and FIG. 3 is a third embodiment according to the present invention. FIG. 4 is a block diagram showing the piezoelectric fan of the embodiment, FIG. 4 is a block diagram showing the basic structure of a piezoelectric bimorph vibrator, and FIG. 5 is a block diagram showing a conventional piezoelectric fan. 8 ... Piezoelectric bimorph vibrator, 9a, 9b ... Piezoelectric element, 10 ... Metal thin plate, 11 ... Elastic thin plate, 12 ... Support part, 13, 14 ... Lead wire, 15 ... Convex part, 16 ...
… Hole, 17 …… U-shaped notch.

Claims (3)

[Scope of utility model registration request] 1. A piezoelectric bimorph vibrator comprising a pair of plate-shaped piezoelectric elements and a metal thin plate having both ends bent in the same direction in a U-shape between the piezoelectric elements. A piezoelectric fan in which elastic thin plates are attached to the bent portions at both ends, and the central portion of the piezoelectric bimorph oscillator is fixed and supported by a supporting portion in a direction orthogonal to the bending portion direction of the metal thin plate. 2. The piezoelectric fan according to claim 1, wherein a convex portion is integrally formed with the metal thin plate at the center of both ends of the metal thin plate in the direction orthogonal to the bending portion direction. 3. The piezoelectric fan according to claim 2, wherein the convex portion is provided with a hole or a U-shaped notch.