Piezo-electric push button switch

• US 4,430,595 A
• Filed: 08/04/1982
• Issued: 02/07/1984
• Est. Priority Date: 07/29/1981
• Status: Expired due to Fees

• Current Assignee: Toko KK
• Original Assignee: Toko KK
• Inventors: Nakasone, Hiroyuki, Sakamoto, Takayasu
• Primary Examiner(s): Budd, Mark O.
• Application Number:
  US06/405,156
• Time in Patent Office: 552 Days
• Field of Search: 310/339, 361/260, 340/365 A
• US Class Current: 310/339
• CPC Class Codes: H03K 17/964 Piezoelectric touch switches
• CPC Class Codes: H03K 17/965 Switches controlled by moving an element forming part of the switch
• CPC Class Codes: H03K 2217/96027 Piezoelectric snap spring
• CPC Class Codes: H10N 30/875 Further connection or lead arrangements, e.g. flexible wiring boards, terminal pins

Abstract

In a piezo-electric push button switch, a flexible printed circuit board is secured to terminals which are embedded in the housing, and the piezo-electric plate is supported by the flexible printed circuit board in such a manner that it is floated from the housing, whereby external impact or vibration is decreased, and in which an integrated circuit consisting of a resistor and a capacitor is incorporated in the switch body, to eliminate harmonics.

Claims

1. A piezo-electric push button switch comprising:

a housing having a plurality of terminals embedded therein;

a depressing member which is movably mounted in said housing;

a flexible printed circuit board in said housing which electrically is conductively secured to said terminals for being mounted thereon;

an electrically conductive plate in said housing between said circuit board and said depressing member and having a plate part and a lead part, said lead part being electrically conductively secured to said flexible printed circuit board;

a piezo-electric plate which has electrodes on both surfaces thereof and is polarized in the direction of the thickness thereof, said piezo-electric plate being fixedly secured to the surface of said electrically conductive plate which is toward said circuit board;

a further lead part between said flexible printed circuit board and said electrode on said piezo-electric plate which is toward said flexible circuit board and mechanically and electrically conductively connecting said electrode and said circuit board; and

striking means constituted by a dome-shaped metal spring and interposed between said depressing member and said electrically conductive plate and which is deformed by depression of said depressing member to thereby strike a blow on said electrically conductive plate.

2. A piezo-electric push button switch as claimed in claim 1 in which said further lead part is a protruding piece on said circuit board and secured to said electrode of said piezo-electric plate which is toward said circuit board.

3. A piezo-electric push button switch as claimed in claim 2, further comprising a chip-shaped resistor and/or a chip-shaped capacitor is connected to said printed circuit board.

4. A piezo-electric push button switch as claimed in claim 3, in which said resistor and said capacitor connected to said printed circuit board form an integrated circuit.