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:
Jun. 19, 1990
Filed:
May. 20, 1988
Shigeru Ohuchida, Zama, JP;
Toshiyuki Inokuchi, Yokohama, JP;
Nobuyuki Baba, Yokohama, JP;
Kazuhiro Fujita, Yokohama, JP;
Hideo Maeda, Yokohama, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An optical head device for recording and reproducing information includes beam splitting and converging mechanisms which has a first portion and a second portion secured to the first portion and is disposed on an optical path of light reflected from a photo-magnetic disk. The first portion is adapted to split the reflected light received by the beam splitting and converging means into two beams which propagate in at least two directions different from each other and adapted to proportion the amount of reflected light in each of the two beams by means of the magnitude of the p-polarized component contained in the reflected light. The second portion is adapted to converge separately the two split beams. The converged two beams are used for reproducing binary data in the photo-magnetic disk.