Defect detection system
CA 1095619 A · Owner: Rca Corporation · Inventors: Gorog, Istvan; Firester, Arthur H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
RCA 68,949, DEFECT DETECTION SYSTEM, Abstract of the Disclosure Defect detection apparatus, for optically inspecting a spiral groove of a video disc record directs a coherent, light beam at the grooved surface of the disc. The incident beam, focused at a point beyond the disc surface illuminates, the grooved surface with a light spot that spans a plurality of convolutions of the groove. Relative motion is established between the disc surface and the incident beam in a manner causing the illuminating spot to rapidly scan the grooved surfaces in a coarse spiral pattern. The structure of the illuminated groove convolutions, absent any defects serves, as a diffraction grating for diffracting …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted February 10, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 10, 1998.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.