JPS62136733A - Bistable displacement amplifier - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a laminated piezoelectric ceramic displacement amplification device used as an actuator for a current switch or the like.

(Prior art) Conventionally, the central part of a flexible member made of an elastic band plate or the like is bent in advance, and the displacement of laminated piezoelectric ceramics is transmitted to both ends of the flexible member, thereby displacing both ends of the flexible member in the vertical direction. There are displacement amplification devices that utilize the resulting large lateral displacement of the flexible member (for example,
SAE report.

No. 800502, page 10, see Fig, 1B).

(Problem to be Solved by the Invention) However, in this displacement amplification device, in order to return the lateral displacement of the flexible member, a load such as a return spring must always be applied in the direction opposite to the direction of displacement. , the displacement time increases accordingly. Therefore, if this displacement amplification device is used as a current open switch or the like, the response of the displacement amplification device will be poor.

An object of the present invention is to provide a multilayer piezoelectric ceramic displacement amplification device with good responsiveness that can be used in current switching switches and the like.

(Means for Solving the Problems) As a means for solving the above-mentioned problems, the present invention has a laminated piezoelectric ceramic fixed on a substrate, a point of force joined to the top of the laminated piezoelectric ceramic, A lever member that has at least two points of action and whose fulcrum is fixed on the V board, and a band-shaped elastic body that exhibits a snap hit function when reversed is bent in advance and both ends are marked. A bistable displacement amplification device comprising: a flexible member coupled to a point of action of a lever member; and an actuating member supported reciprocally by a guide and coupled at its end to a central portion of the surface flexible member. It is a device.

(Example) The present invention will be described below based on drawings showing examples. FIG. 1 shows an embodiment in which a bistable displacement amplification device including a flexible member made of a spring plate is applied to a current switching switch. The current opening/closing switch has a casing 1 composed of a switch section 1a and an actuator section 1b. The casing 1 is made of an electrical insulator, and a partition wall 2 is provided at the boundary between the two compartments, and a guide hole 2a is provided in the center of the partition wall 2.
is penetrated.

Reference numeral 3 denotes a main body of the bistable displacement amplification device, which is inserted and fixed into the actuator section 1b of the casing 1 via the substrate 4. A lever member 5 having a planar shape as shown in FIG. 1 is integrally provided on the substrate 4. 5a is the force point part of the lever member 5, 5b is the fulcrum part,
Similarly, 5c is a point of action. A space is provided between the substrate 4 and the force point portion 5a, into which a laminated piezoelectric ceramic 6 is fitted. Reference numeral 7 denotes a flexible member, and both ends 7b of the flexible member 7 are connected to the inner action point 5c of the lever 5, with the central portion 7a being bent.

The flexure member 7 consists of a spring plate that exhibits a snap-hit function when the central portion 7a is reversed. Central part 7 of the flexible member 7
An actuating member 8 is attached to a, and the actuating member 8 is slidably inserted into a guide hole 2a provided in the partition wall 2. The head of the actuating member 8 protruding from the guide hole 2a is arranged so as to come into contact with an arm 9 which is an elastic body and a conductor. A contact 10 is provided at the free end of the arm 9, and the opposite end is fixed to the base of a conductor 11. Contact 10 is in contact with either conductor 12 or 13. 14 is a connector for a signal current of the laminated piezoelectric ceramic 6, and 15 is a connector for a current to be controlled.

The bistable displacement amplification Rffi configured as described above, when no electric field is acting on the laminated piezoelectric ceramics 6,
The bending member 7 is bent forward, and the central portion 7a is at the position indicated by the solid line in the figure.

Next:] When an electric field is applied in a pulsed manner from the connector 4 to the laminated layer 1 [electroceramic 6, the action point 5C of the lever member 5 suddenly moves outward, and both ends 7b of the flexible member 7 are also displaced outward, The central portion 7a is reversed and moved to the position indicated by the broken line in the figure. At this time, kinetic energy is accumulated in the actuating member 8. When the energization from the connector 14 is stopped during the movement of the flexible member 7 and the actuating member 8, the piezoelectric ceramic 6
contracts, and the point of action 5c returns to its inner position. However, the bending member 7 and the actuating member 8 do not return to their original positions due to kinetic energy, but continue to move and reach the position indicated by the broken line. As a result, the contact 10 comes into contact with the conductor M body 13, and the conductors 11 and 13 become electrically connected.

When an electric field acts on the laminated piezoelectric ceramic 6 again, the flexible member 7 and the actuating member 8 move in the opposite direction to the position shown by the solid line in the figure, and the conductors 11 and 12 become electrically conductive.

FIG. 2 shows the timing charts 1 to 1 of this open/close switch. Reference numeral 21 is an external electric signal, and a circuit (not shown) is used to convert only the changing portion of this signal @21 into an R current.
is obtained. The input signal 22 is input to the connector 14,
This activates the open/close switch. As a result of this, a current 23 is obtained at the terminals of the connector 15.

(Effects of the Invention) Since the present invention is a bistable displacement amplification device using laminated piezoelectric ceramics having the configuration described above, it has excellent responsiveness and can be used as an actuator for a current opening/closing switch. , it is also possible to reduce power consumption.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, and Fig. 1 is a sectional view of a current opening/closing switch using the bistable displacement amplification device according to the invention as an actuator, and Fig. 2 is an operation timing chart of the current opening/closing switch of Fig. 1. be. 2a... Guide 4... Substrate 5... Lever member 5a... Force point part 5b... Fulcrum part 5C... Action point part 6... Laminated piezoelectric ceramics 7... Flexible member 8.・・Operating parts

Claims (1)

[Claims] A laminated piezoelectric ceramic fixed on a substrate, a lever member whose force point is joined to the top of the laminated piezoelectric ceramic, has at least two points of action, and whose fulcrum is fixed on the substrate, and a lever member whose force point is bonded to the top of the laminated piezoelectric ceramic and whose fulcrum is fixed on the substrate, and a lever member whose force point is bonded to the top of the laminated piezoelectric ceramic and whose fulcrum is fixed on the substrate; A flexible member having a central part of a band-shaped elastic body that exhibits a hit function is pre-flexed and both ends of which are connected to the point of action of the lever member, and a flexible member that is supported reciprocally by a guide and has one end at the center of the flexible member. and an actuating member coupled to the bistable displacement amplifying device.