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:
Oct. 22, 1991
Filed:
Oct. 17, 1988
Nobuaki Kubo, Urawa, JP;
Isamu Shibata, Fuchu, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An apparatus for handling an optical card which is generally rectangular in shape and formed with a first plurality of circular, concentric recording tracks and a second plurality of arc-shaped, concentric recording tracks in each of a pair of sectors defined by a pair of hypothetical diagonal lines of the card and located outside of the first plurality of circular, concentric recording tracks. An optical pick-up is moved to a desired track first by a coarse seek operation which uses the difference between a selected count and the count from a linear sensor, and a fine seek operation which uses the sum of a track correspondence voltage and a track error signal.