US4338506A
Expired / Lapsed
US
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Method of trimming thick film capacitor
Assignee: Motorola Solutions Inc
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Filing: 1979-09-07
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Granted: 1982-07-06
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Expires: 1999-09-07
Abstract
Abstract An adjustable thick film capacitor includes a conductive paste layer which is fired to form a first electrode on a substrate, at least one dielectric paste layer over the conductive electrode which is also fired, and an organo-metallic paste layer over the dielectric layer, which is fired at high temperature to form a very thin sintered metallic conductive layer for the second electrode. The organo-metallic paste includes molecules having conducting particles, such as gold atoms, which after firing form a residue layer having a thickness of the order of 1 micron. This thin electrode can be trimmed by an accurately controlled low energy laser beam to adjust the capacitor value.
Inventors
- 👤 Gary R. Geller
- 👤 Anthony B. Suppelsa
- 👤 William J. Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:13
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/005; H01G4/008; H01G4/255; Y; Y10; Y10T; Y10T29/00; Y10T29/43; Y10T29/435
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
132 words
The process for making a thick film capacitor including the steps of: screening a first layer of conductive paste on a substrate to form a capacitor electrode, drying the first conductive paste layer, screening a second dielectric paste layer over the first layer to form the capacitor dielectric, drying the second dielectric paste layer, screening a third layer of organo-metallic paste having molecules containing conductive particles over the second layer to form a second capacitor electrode, drying the third organo-metallic paste layer, firing the first, second and third layers, and continuing such firing until the third layer is reduced to a layer of conductive particles having a maximum thickness of 2 microns, and trimming the third layer to adjust the size of the electrode formed thereby and the value of the capacitor.
Claim 2
Dependent Claim
132 words
The process for making a thick film capacitor including the steps of: screening a first layer of conductive paste on a substrate to form a capacitor electrode, drying the first conductive paste layer, screening a second dielectric paste layer over the first layer to form the capacitor dielectric, drying the second dielectric paste layer, screening a third layer of organo-metallic paste having molecules containing conductive particles over the second layer to form a second capacitor electrode, drying the third organo-metallic paste layer, firing the first, second and third layers, and continuing such firing until the third layer is reduced to a layer of conductive particles having a maximum thickness of 2 microns, and trimming the third layer to adjust the size of the electrode formed thereby and the value of the capacitor.
Claim 3
Dependent Claim
30 words
The process of claim 1 wherein an additional layer of dielectric paste is applied over the second dielectric layer prior to the application of the third layer of organo-metallic paste.
Claim 4
Dependent Claim
14 words
The process of claim 1 wherein the organo-metallic layer includes molecules containing gold atoms.
Claim 5
Dependent Claim
20 words
The process of claim 3 wherein the third layer is reduced to a thickness of the order of 1 micron.
Claim 6
Dependent Claim
27 words
The process of claim 4 wherein the third layer is trimmed by vaporizing a portion of the top electrode by use of a low energy laser beam.
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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) | 1985-07-05 | 1986-01-04 | 1986-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-05 | 1990-01-04 | 1990-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-05 | 1994-01-04 | 1994-07-06 | $7700.00 | Window Closed / Lapsed |