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. 10, 1989
Filed:
Oct. 15, 1986
Hiroshi Sunagawa, Kanagawa, JP;
Kozi Kamiyama, Kanagawa, JP;
Fuji Photo Film Co., Ltd., , JP;
Abstract
A pick-up head for use with an optical information storage disk includes an optical waveguide, a light source, a waveguide lens, a focusing grating coupler, and a light detector. Wave light generated by the light source and propagated via the wave guide lens through the optical waveguide is deflected by a surface elastic wave generated by an inter-digital transducer. The inter-digital transducer is controlled by a tracking error signal to vary the frequency of the surface elastic wave to change the deflection angle of the wave light in order to eliminate any tracking error to which a light spot on the optical disk is subjected. Focusing control may be effected by a conventional focusing control mechanism or a bimorph driven by a focusing error signal.