US3704372A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical pattern tracer
Assignee: Westinghouse Canada Inc
•
Filing: 1970-10-19
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Granted: 1972-11-28
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Expires: 1990-10-19
Abstract
Abstract A rotary scan line/edge tracer using a motor driven mirror to produce the rotary scan. The motor also drives a generator for providing two coordinate reference signals. The mirrors assembly is exchangeable to provide varying scan diameters. The photocell is mounted adjacent the center of the focusing lens at the lower part of the apparatus, thus permitting a coaxial arrangement of the motor and mirror and lens producing a compact assembly. The reference signals are sampled instantaneously to produce coordinate drive signals.
Inventors
- 👤 Robert E Parker
- 👤 Malcolm A Lodge
- 👤 George S Jewell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:58
CPC Classifications
B; B23; B23Q; B23Q35/00; B23Q35/04; B23Q35/08; B23Q35/12; B23Q35/127; B23Q35/128
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
191 words
A photo electric edge tracing apparatus including an optical scanning system arranged to scan a circular path on a surface bearing an optically detectable image to be traced, said optical system comprising a housing, a subframe rotatably and removably mounted in the upper end of said housing, an electric motor mounted in said subframe, a generator arranged coaxially with said motor with two rotors fixed to the shaft of said motor and at 90 electrical degrees with respect to each other, a mirror assembly mounted on the lower end of said shaft, a lens mounted in the lower end of said housing coaxial with said motor, a photocell mounted adjacent the upper surface at the center of said lens and facing said mirror assembly, a mirror mounted on said mirror assembly eccentric with respect to the axis of said motor with the plane of said mirror almost at right angles to said axis, said lens and said mirror arranged to focus a portion of said detectable image on said photocell whereby rotation of said mirror assembly by said motor causes the photocell to effectively scan said surface in a circular path.
Claim 2
Dependent Claim
191 words
A photo electric edge tracing apparatus including an optical scanning system arranged to scan a circular path on a surface bearing an optically detectable image to be traced, said optical system comprising a housing, a subframe rotatably and removably mounted in the upper end of said housing, an electric motor mounted in said subframe, a generator arranged coaxially with said motor with two rotors fixed to the shaft of said motor and at 90 electrical degrees with respect to each other, a mirror assembly mounted on the lower end of said shaft, a lens mounted in the lower end of said housing coaxial with said motor, a photocell mounted adjacent the upper surface at the center of said lens and facing said mirror assembly, a mirror mounted on said mirror assembly eccentric with respect to the axis of said motor with the plane of said mirror almost at right angles to said axis, said lens and said mirror arranged to focus a portion of said detectable image on said photocell whereby rotation of said mirror assembly by said motor causes the photocell to effectively scan said surface in a circular path.
Claim 3
Dependent Claim
54 words
A photo electric edge tracing apparatus as claimed in claim 12 wherein the values of the outputs from said generator is determined at the point in time that the photocell scans the edge being traced and voltages proportional to said values are used to control motors for positioning said housing relative to said surface.
References Cited (Backward Citations)
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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) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |