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. 09, 1980
Filed:
Nov. 13, 1978
Applicant:
Inventors:
Kiyoshi Maeda, Takatsuki, JP;
Kyohei Fujisawa, Kyoto, JP;
Assignee:
Dainippon Screen Seizo Kabushiki Kaisha, Kyoto, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01S / ; G11B / ;
U.S. Cl.
CPC ...
250205 ; 1791 / ; 331 / ; 346 / ;
Abstract
A light ray emitted by a light source and which is to be modulated by an acoustic-optical modulator element is stabilized by its intensity being detected before it enters the acoustic-optical modulator element and being used to produce correction signals. The correction signals are used to amplitude-modulate a high-frequency carrier in reverse phase to the change of intensity of the light ray, to produce corrected carrier signals. Then the corrected carrier signals are further amplitude-modulated by control signals to produce modulator signals which are used to modulate the light ray in the acoustic-optical modulator element.