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. 01, 1991
Filed:
Oct. 03, 1988
Richard B MacAnally, Boulder, CO (US);
Storage Technology Partners II, Denver, CO (US);
Abstract
The composite optical grating for optical disk data storage systems uses a first optical grating to generate three light beams disposed approximately on a straight line. A second optical grating in the composite optical grating is juxtaposed with the first optical grating and divides the three light beams into two images, each consisting of a three spot array. The first of these images is focused on a first data storage track while the second image of three spots is focused on a second adjacent data storage track. The three spot array formed on the first track is used in conventional fashion to read data from this data storage track. The center spot is used to read the data from the data storage track while the two outer linearly oriented spots are used for tracking purposes. The second image formed by the second optical grating is focused on a second adjacent data storage track and only the center spot of the three spot array is used to read data from the second data storage track. The adjacent outer spots in the second image are not used although they are available for use for tracking purposes.