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:
Jan. 25, 1977
Filed:
Oct. 20, 1975
Richard A Coppock, San Jose, CA (US);
GTE Sylvania Incorporated, Mountain View, CA (US);
Abstract
A wideband analog photorecorder comprises a transparent Bragg cell as an acousto-optic transducer and a pulsed laser positioned to sequentially illuminate a moving recording medium (photographic film) through the cell. The acousto-optic cell is energized by an input electrical signal and the resultant acoustical wave passing through the cell diffracts the 'strobelike' output beam from the laser so as to expose the film one line at a time with the optical analog of the signal. The pulse repetition frequency of the laser is synchronized with the velocity of acoustic wave propagation in the Bragg cell so as to expose a new signal segment in the cell with each laser pulse and thereby form one recorded line on the film. The Bragg cell utilizes an optically transparent medium, such as lithium niobate, as an acoustic wave carrier to provide optical resolution through diffraction of the laser beam. This invention may be practiced utilizing either anisotropic or normal Bragg diffraction, with or without acoustic beam steering. The method of this invention comprises converting the amplitude modulated signal of interest to an acoustic wave, causing the acoustic wave to propagate through a Bragg cell, passing a pulsed laser output beam through an active region constituting a substantial part of the length of the Bragg cell so as to diffract the beam in accordance with the acoustic signal, and optically recording the diffracted laser beam on a moving film so that one line of data is recorded on the film each time the laser is turned on in the manner of a strobe light.