Patent US4772774A successfully refreshed from Google Patents.
US4772774A
Expired / Lapsed
US
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Laser trimming of electrical components
Assignee: Teradyne Laser Systems Inc
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Filing: 1987-06-02
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Granted: 1988-09-20
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Expires: 2007-06-02
Abstract
Abstract A method of laser trimming an electronic component to achieve a desired electronic characteristic including entering into a controller the desired value of the characteristic of the component being trimmed, measuring the beginning value of the characteristic of the component being trimmed, determining the value of the length of a first leg of cut of the component by reference to information based upon cuts of legs of different lengths of a component of the same geometry as the component being trimmed, and cutting the component being trimmed using the laser to obtain the first leg of the cut.
Inventors
- 👤 Philippe G. Lejeune
- 👤 Bernard E. Lejeune
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:07
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/22; H01C17/24; H01C17/242; B; B23; B23K; B23K26/00; B23K26/351; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
98 words
A method of laser trimming an electronic component to achieve a desired electronic characteristic comprising entering into a controller the desired value of said characteristic of said component being trimmed, measuring the beginning value of said characteristic of said component being trimmed, determining the value of the length of a first leg of cut of said component by reference to information based upon cuts of legs of different lengths of a component of the same geometry as the component being trimmed, and cutting said component being trimmed using said laser to obtain said first leg of said cut.
Claim 2
Independent Claim
98 words
A method of laser trimming an electronic component to achieve a desired electronic characteristic comprising entering into a controller the desired value of said characteristic of said component being trimmed, measuring the beginning value of said characteristic of said component being trimmed, determining the value of the length of a first leg of cut of said component by reference to information based upon cuts of legs of different lengths of a component of the same geometry as the component being trimmed, and cutting said component being trimmed using said laser to obtain said first leg of said cut.
Claim 3
Dependent Claim
51 words
The method of claim 1 wherein said first leg is the first leg of a U-cut having first, second, and third legs, and further comprising determining a predetermined characteristic value for terminating cutting of said second leg of said cut to achieve the desired characteristic value after cutting said third leg.
Claim 4
Dependent Claim
11 words
The method of claim 1 wherein said component is a resistor.
Claim 5
Dependent Claim
10 words
The method of claim 3 wherein said characteristic is resistance.
Claim 6
Dependent Claim
19 words
The method of claim 4 wherein said information is the length of said leg as a function of PRETEST.
Claim 7
Dependent Claim
36 words
The method of claim 5 wherein said information is in the form of length equals A|PRETEST| B , wherein A and B are constants determined by cuts associated with selected PRETEST values and forced DRES values.
Claim 8
Dependent Claim
11 words
The method of claim 2 wherein said component is a resistor.
Claim 9
Dependent Claim
28 words
The method of claim 7 wherein said predetermined characteristic value relates to SRES, percentage of resistance less than desired resistance, DRES, at the end of said second leg.
Claim 10
Dependent Claim
31 words
The method of claim 8 wherein SRES equals A'|PRETEST| B' , wherein A' and B' are constants determined by cuts of components of the same geometry as the component being trimmed.
Claim 11
Independent Claim
93 words
A method of laser trimming a U-cut having first, second, and third legs in a resistor to achieve a desired end resistance after cutting said third leg comprising entering into a controller the desired value of said end resistance of said resistor being trimmed, measuring the beginning resistance of said resistor being trimmed, determining a predetermined resistance value for terminating said second leg to achieve said desired end resistance value, and cutting said second leg while measuring said resistance until the measured value equals the predetermined resistance value and then ending said leg.
Claim 12
Independent Claim
93 words
A method of laser trimming a U-cut having first, second, and third legs in a resistor to achieve a desired end resistance after cutting said third leg comprising entering into a controller the desired value of said end resistance of said resistor being trimmed, measuring the beginning resistance of said resistor being trimmed, determining a predetermined resistance value for terminating said second leg to achieve said desired end resistance value, and cutting said second leg while measuring said resistance until the measured value equals the predetermined resistance value and then ending said leg.
Claim 13
Dependent Claim
27 words
The method of claim 10 wherein said predetermined value relates to SRES, percentage of resistance less than desired resistance, DRES, at the end of said second leg.
Claim 14
Dependent Claim
31 words
The method of claim 11, wherein SRES equals A'|PRETEST| B' , wherein A' and B' are constants determined by cuts of components of the same geometry as the component being trimmed.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-20 | 1992-03-21 | 1992-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-20 | 1996-03-21 | 1996-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-20 | 2000-03-21 | 2000-09-20 | $7700.00 | Window Closed / Lapsed |