US4737742A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unit carrying surface acoustic wave devices
Assignee: Alps Alpine Co Ltd
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Filing: 1986-12-15
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Granted: 1988-04-12
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Expires: 2006-12-15
Abstract
Abstract A unit comprising a printed board on which a plurality of surface acoustic wave (SAW) devices are installed. Each SAW device comprises a piezoelectric substate on which arrays of strip electrodes are formed. A cover is mounted over the SAW devices to hermetically seal the surfaces of the SAW devices on which the electrodes are formed. The terminals of the board are directly coupled to the terminals of the SAW devices.
Inventors
- 👤 Takehiro Takoshima
- 👤 Takehiko Sone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:21
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/05; H03H9/0538; H03H9/0547; H03H9/0557; H03H9/058; H03H9/059; H03H9/10; H03H9/1064; H03H9/1071; H03H2009/0019
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
214 words
A hermetically sealed unit for carrying surface acoustic wave devices, comprising: a printed circuit board having a substrate with a given surface area on which circuit patterns including circuit terminals are formed; a spacer layer provided on the periphery of the surface of the printed circuit board surrounding the surface area and circuit patterns thereon; a plurality of surface acoustic wave devices each having a piezoelectric substrate on which at least one pair of strip shaped electrodes with connecting terminals are formed, said devices being mounted on the surface of the printed circuit board with the connecting terminals thereof joined physically and electrically to corresponding circuit terminals of the circuit patterns thereon; a cover sealed by adhesive to the spacer layer on the printed circuit board for hermetically sealing the surface of the printed circuit board on which the surface acoustic wave devices are mounted; and a peripheral edge of the printed circuit board being formed with semicircular cutout portions provided with external terminals which are electrically connected to the circuit terminals of the circuit patterns and to the connecting terminals of the surface acoustic wave devices, thereby allowing the surface acoustic wave devices to be electrically connected to external circuits through said external terminals while maintaining the hermetic seal of said carrying unit.
Claim 2
Dependent Claim
214 words
A hermetically sealed unit for carrying surface acoustic wave devices, comprising: a printed circuit board having a substrate with a given surface area on which circuit patterns including circuit terminals are formed; a spacer layer provided on the periphery of the surface of the printed circuit board surrounding the surface area and circuit patterns thereon; a plurality of surface acoustic wave devices each having a piezoelectric substrate on which at least one pair of strip shaped electrodes with connecting terminals are formed, said devices being mounted on the surface of the printed circuit board with the connecting terminals thereof joined physically and electrically to corresponding circuit terminals of the circuit patterns thereon; a cover sealed by adhesive to the spacer layer on the printed circuit board for hermetically sealing the surface of the printed circuit board on which the surface acoustic wave devices are mounted; and a peripheral edge of the printed circuit board being formed with semicircular cutout portions provided with external terminals which are electrically connected to the circuit terminals of the circuit patterns and to the connecting terminals of the surface acoustic wave devices, thereby allowing the surface acoustic wave devices to be electrically connected to external circuits through said external terminals while maintaining the hermetic seal of said carrying unit.
Claim 3
Dependent Claim
33 words
A unit as set forth in claim 1, wherein the surfaces of the surface acoustic wave devices on which the electrodes are formed are covered with an insulating film except for the terminals.
Claim 4
Dependent Claim
51 words
A unit as set forth in claim 2, wherein the insulating film is made from at least one material selected from the group consisting of SiO 2 , Si 3 N 4 , Ta 2 O 5 , Al 2 O 3 , ZrO 2 , TiO 2 , and TaN.
Claim 5
Dependent Claim
22 words
A unit as set forth claim 1 wherein the printed board is a multilayer printed board having laminated, printed circuit substrate layers.
Claim 6
Dependent Claim
23 words
A unit as set forth in claim 2, wherein the printed board is a multilayer printed board having laminated, printed circuit substrate layers.
Claim 7
Dependent Claim
24 words
A unit as set forth in any claim 3, wherein the printed board is a multilayer printed board having laminated, printed circuit substrate layers.
References Cited (Backward Citations)
US3885173A
Cited
JPS5378935A
Cited
JPS5414137A
Cited
US4243960A
Cited
US4365219A
Cited
JPS58130613A
Cited
JPS593957A
Cited
JPS60244108A
Cited
US4617487A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-12 | 1991-10-12 | 1992-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-12 | 1995-10-12 | 1996-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-12 | 1999-10-12 | 2000-04-12 | $7700.00 | Window Closed / Lapsed |