US5030875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sacrificial quartz crystal mount
Assignee: CTS Corp
•
Filing: 1990-01-26
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Granted: 1991-07-09
•
Expires: 2010-01-26
Abstract
Abstract In a conventional quartz crystal resonator, a sacrificial quartz layer attached to the mounting posts and between the active, vibrating quartz layer and the package base reduces mechanical stresses on the active quartz layer caused by thermal expansion coefficient differences. The intermediate quartz layer is a sacrificial layer which acts to maintain the spacing of mounting posts.
Inventors
- 👤 Thomas A. Knecht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:58
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/05; H03H9/0504; H03H9/0509; H03H9/0514
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
105 words
A piezoelectric quartz crystal resonator comprised of: a package base having a first thermal expansion coefficient; an active piezoelectric quartz layer including electroded surfaces and with a second thermal expansion coefficient; mounting pedestals coupled to and cantilevered from said package base and coupled to said active piezoelectric quartz layer, said mounting pedestals capable of exerting mechanical stress on said active piezoelectric quartz layer arising from differences between said first and second thermal expansion coefficients; and an intermediate layer means coupled to said mounting pedestals and between said active piezoelectric quartz layer and said package base for reducing mechanical stress on said active piezoelectric quartz layer.
Claim 2
Dependent Claim
105 words
A piezoelectric quartz crystal resonator comprised of: a package base having a first thermal expansion coefficient; an active piezoelectric quartz layer including electroded surfaces and with a second thermal expansion coefficient; mounting pedestals coupled to and cantilevered from said package base and coupled to said active piezoelectric quartz layer, said mounting pedestals capable of exerting mechanical stress on said active piezoelectric quartz layer arising from differences between said first and second thermal expansion coefficients; and an intermediate layer means coupled to said mounting pedestals and between said active piezoelectric quartz layer and said package base for reducing mechanical stress on said active piezoelectric quartz layer.
Claim 3
Dependent Claim
12 words
The resonator of claim 1 where said package is a leaded package.
Claim 4
Dependent Claim
11 words
The resonator of claim 1 where said package is surface mountable.
Claim 5
Dependent Claim
13 words
The crystal resonator of claim 1 where said intermediate layer means is quartz.
Claim 6
Dependent Claim
33 words
The crystal resonator of claim 1 where said first thermal expansion coefficient is between approximately 2 and 10 ppm/degrees C. and said second thermal expansion coefficient is between 10 and 20 ppm/degree C.
Claim 7
Dependent Claim
24 words
The crystal resonator of claim 5 where said intermediate layer has a thermal expansion coefficient substantially between said first and second thermal expansion coefficients.
Claim 8
Dependent Claim
12 words
The crystal resonator of claim 1 where said mounting base is ceramic.
Claim 9
Dependent Claim
13 words
The crystal resonator of claim 1 where said mounting posts are conductive epoxy.
Claim 10
Dependent Claim
13 words
The crystal resonator of claim 1 where said mounting posts are conductive adhesive.
Claim 11
Dependent Claim
13 words
The communications device of claim 1 where said mounting posts are conductive epoxy.
Claim 12
Dependent Claim
14 words
The crystal resonator of claim 1 where said crystal has a predetermined fabrication cut.
Claim 13
Dependent Claim
26 words
The crystal resonator of claim 11 where said intermediate layer is quartz with a fabrication cut substantially identical to said fabrication cut of said crystal resonator.
Claim 14
Dependent Claim
17 words
The crystal resonator of claim 1 including means for conducting electrical signals to said electroded crystal plate.
Claim 15
Dependent Claim
25 words
The crystal resonator of claim 13 where said means for conducting electrical signals includes wires bonded to said electroded crystal plate and said package base.
Claim 16
Dependent Claim
28 words
The crystal resonator of claim 13 where said means for conducting electrical signals includes conductive adhesive on said electroded crystal plate, said intermediate layer and said package base.
Claim 17
Dependent Claim
42 words
The crystal resonator of claim 1 where said intermediate layer means is coupled to said package base by at least one, first mounting means and said electroded crystal plate is coupled to said intermediate layer by at least one second mounting means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-07-08 | 1995-01-07 | 1995-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-08 | 1999-01-07 | 1999-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-08 | 2003-01-07 | 2003-07-09 | $7700.00 | Window Closed / Lapsed |