US4469723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plating control system
Assignee: Fairchild Semiconductor Corp
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Filing: 1982-11-01
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Granted: 1984-09-04
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Expires: 2002-11-01
Abstract
Abstract An improved method to calculate the relative position between a plating head and an intermittently moved web of material that is to be plated wherein a nozzle directs pressurized fluid through an aperture in the web and the back pressure is monitored as an indication of the relative position of the nozzle and the aperture. Back pressure is represented digitally and a microprocessor waits an interval for the pressure to stabilize, compares the digital signal to a look up table in memory to determine the error in position, and commands movement of the plating head a distance sufficient to bring the error to zero.
Inventors
- 👤 Nadeemul Haq
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:31
CPC Classifications
C; C25; C25D; C25D21/00; C25D21/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
163 words
A method of positioning a plating head relative to a web of material to be plated in which a stream of fluid is directed against an aperture in the web, and the back pressure in said stream is measured as an indication of the relative alignment between the stream and the aperture, and in which the plating head is adjustable so as to cause the back pressure to be a predetermined amount, comprising the steps of: A. intermittently moving the web relative to said head; B. waiting an interval of time after the web has stopped moving relative to the head so as to allow the back pressure to stabilize; C. measuring the back pressure and converting the measurement to a digital signal representative of the pressure; D. comparing said digital signal to a table in memory to determine the error in position; and E. moving the plating head in a single movement by an amount sufficient to correct said error in position.
Claim 2
Independent Claim
163 words
A method of positioning a plating head relative to a web of material to be plated in which a stream of fluid is directed against an aperture in the web, and the back pressure in said stream is measured as an indication of the relative alignment between the stream and the aperture, and in which the plating head is adjustable so as to cause the back pressure to be a predetermined amount, comprising the steps of: A. intermittently moving the web relative to said head; B. waiting an interval of time after the web has stopped moving relative to the head so as to allow the back pressure to stabilize; C. measuring the back pressure and converting the measurement to a digital signal representative of the pressure; D. comparing said digital signal to a table in memory to determine the error in position; and E. moving the plating head in a single movement by an amount sufficient to correct said error in position.
Claim 3
Dependent Claim
26 words
The method of claim 1 in which said measuring step comprises taking a plurality of measurements of the back pressure and calculating the average value thereof.
Claim 4
Dependent Claim
30 words
The method of claim 1 in which said table in memory stores a series of precalculated non-linear values for the error in position as a function of the back pressure.
Claim 5
Dependent Claim
30 words
The method of claim 2 in which said table in memory stores a series of precalculated non-linear values for the error in position as a function of the back pressure.
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) | 1987-09-04 | 1988-03-05 | 1988-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-04 | 1992-03-05 | 1992-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-04 | 1996-03-05 | 1996-09-04 | $7700.00 | Window Closed / Lapsed |