# US 5,334,902 A · Electrostrictive effect device

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- Number: US 5,334,902 A
- Document ID: US5334902A
- Status: Granted
- Kind: A
- Application number: 08/058,941
- Filed: 1993-05-07
- Granted: 1994-08-02
- Earliest claimed: 1992-05-08
- Assignees: NEC Corporation
- Inventors: Takayuki Inoi
- Web page: https://patentgrep.com/patent/US5334902A

## CPC

- H10N 30/88: Mounts; Supports; Enclosures; Casings
- H10N 30/50: having a stacked or multilayer structure
- H10N: ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR

## Abstract

An electrostrictive effect element is enclosed by a hermetic terminal, a thin-film metallic case, and a metallic member so as to weld the terminal onto the case and the case onto the member. The obtained unit is installed in a thick-film metallic case with sliding members such as O-shaped rings disposed between the unit and the case, thereby forming an electrostrictive effect device. Moreover, to facilitate installation of the device in an apparatus, a screw groove is disposed on a side surface at least at a location near an end surface of the thick-film case. The structure removes the disadvantage that a leakage occurs in the hermetic state due to a flaw caused on the thin-film case, for example, by a blow. Moreover, when installing the device in an apparatus, the user may grasp the device on the side surface thereof, which improves operability of the device in the installation thereof.

## Claims

### Claim 1

An electrostrictive effect device, comprising:
a multi-layer element in which electrostrictive effect ceramic layers and inner electrode conductive layers are alternately accumulated thereonto;
a thin-film case formed of a thin metallic film and a metallic member, the film and the member hermetically sealing up the multi-layer element;
sliding members disposed around the thin-film case; and
a thick-film case disposed around the sliding members.

### Claim 2 (depends on 1)

A device in accordance with claim 1, wherein each of the sliding members is an O-shaped ring formed of vinyl chloride, silicon, or Teflon polytetrafluroethylene.

### Claim 3 (depends on 1)

A device in accordance with claim 1, wherein each of the sliding members is a grease made of silicon, or Teflon polytetrafluroethylene.

### Claim 4 (depends on 1)

A device in accordance with claim 1, wherein the thick-film case has a screw groove on a side surface thereof at least at an end thereof.

### Claim 5 (depends on 1)

A device in accordance with claim 1, wherein the thick-film case possesses at least two flat planar portions on a side surface thereof, the planar portions opposing each other.

### Claim 6 (depends on 1)

A device in accordance with claim 1, wherein the thick-film case includes at least one screw groove on a side surface thereof formed in a direction of thickness thereof.

### Claim 7 (depends on 4)

A device in accordance with claim 4, wherein the screw groove is disposed on an inner circumferential surface of the thick-film case at an upper end and a lower end thereof.

### Claim 8 (depends on 4)

A device in accordance with claim 4, wherein the screw groove is disposed on an outer circumferential surface of the thick-film case at an upper end and a lower end thereof.

### Claim 9 (depends on 4)

A device in accordance with claim 4, wherein a screw groove is disposed on an outer circumferential surface of the thick-film case at an upper end thereof and a screw groove is disposed on an inner circumferential surface thereof at a lower end thereof.

### Claim 10 (depends on 4)

A device in accordance with claim 4, wherein a screw groove is disposed on an inner circumferential surface of the thick-film case at an upper end thereof and a screw groove is disposed on an outer circumferential surface thereof at a lower end thereof.

### Claim 11 (depends on 1)

A device in accordance with claim 1, wherein the thick-film case has a bottom portion at a lower end thereof.

### Claim 12 (depends on 10)

A device in accordance with claim 10, wherein the thick-film case has a bottom portion at a lower end thereof.

### Claim 13 (depends on 1)

A device in accordance with claim 1, wherein the thick-film case is made of a metal.