# US 6,294,878 B1 · Piezoelectric transformer, piezoelectric inverter and liquid crystal display

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- Number: US 6,294,878 B1
- Document ID: US6294878B1
- Status: Granted
- Kind: B1
- Application number: 09/527,174
- Filed: 2000-03-17
- Granted: 2001-09-25
- Earliest claimed: 1999-04-14
- Assignees: Murata Manufacturing Co., Ltd.
- Inventors: Koji Murata; Etsuo Nishikawa
- Web page: https://patentgrep.com/patent/US6294878B1

## CPC

- H10N 30/40: with electrical input and electrical output, e.g. functioning as transformers
- H05B 41/2822: {using specially adapted components in the load circuit, e.g. feed-back transformers, piezoelectric transformers; using specially adapted load circuit configurations}
- H10N 30/875: {Further connection or lead arrangements, e.g. flexible wiring boards, terminal pins}
- H10N: ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL

## Abstract

The present invention provides a piezoelectric transformer, a piezoelectric inverter, and a liquid crystal display with a high reliability, capable of preventing the occurrence of the soundings caused by the contact between gold thread wires and preventing the breaking of the gold thread wires and the deterioration of the performance of the piezoelectric transformer. The gold thread wire for wiring used in a piezoelectric transformer has a structure wherein band-like metallic foils are wound around a core consisting of numerous fine wires bundled, and the gold thread wire is constituted by impregnating it with wax.

## Claims

### Claim 1

A piezoelectric transformer comprising a piezoelectric transformer element disposed on a mounting board and a gold thread wire for connecting the electrode of the piezoelectric transformer element and the electrode of the mounting board, wherein:
the metallic foil of said gold thread wire is coated with a coating material.

### Claim 2

A piezoelectric transformer comprising a piezoelectric transformer element disposed on a mounting board and a gold thread wire for connecting the electrode of the piezoelectric transformer element and the electrode of the mounting board, wherein:
said gold thread wire is coated with, and penetrated into by a coating material.

### Claim 3 (depends on 1)

A piezoelectric transformer as claimed in claim 1, wherein said coating material is wax.

### Claim 4 (depends on 1)

A piezoelectric transformer as claimed in claim 1, wherein said coating material is a flexible resin adhesive.

### Claim 5 (depends on 1)

A piezoelectric transformer as claimed in claim 1, wherein said coating material is a lubricant.

### Claim 6 (depends on 1, 2)

A piezoelectric inverter, including the piezoelectric transformer claimed in either claim 1 or claim 2.

### Claim 7 (depends on 1, 2)

A liquid crystal display, including the piezoelectric transformer claimed in either claim 1 or claim 2.

### Claim 8 (depends on 2)

A piezoelectric transformer as claimed in claim 2, wherein said coating material is wax.

### Claim 9 (depends on 2)

A piezoelectric transformer as claimed in claim 2, wherein said coating material is a flexible resin adhesive.

### Claim 10 (depends on 2)

A piezoelectric transformer as claimed in claim 2, wherein said coating material is a lubricant.