The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 30, 1980
Filed:
Mar. 27, 1978
John S Winslow, Altadena, CA (US);
MCA Disco-Vision, Inc., Universal City, CA (US);
Abstract
Apparatus and process for writing upon a video record and for reading the video information from the video record after the writing is complete, and the video disc structure so written. The apparatus includes a laser and an optical system which directs the laser beam to a prepared rotating disc. The disc has a very thin metallic coating. A first lens acts to diverge the laser beam so as to fill a miscroscope objective lens which focuses the beam to a small spot of approximately 1 .mu.m in diameter. The spot contains sufficient energy to melt the metallic surface coating on the disc. The surface tension of the molten metal makes it draw back leaving a hole. Video information in the form suitable for display with a T.V. monitor is applied to an F.M. modulator for forming an F.M. signal. The F.M. signal intensity modulates a laser beam passing through a Pockels cell--Glan prism combination. The series of holes forming the coating of the disc represent the F.M. signal. Since an F.M. signal characteristically is a frequency variable signal, the length of the holes and the distance between successive holes vary to represent the F.M. signal.