Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1988-05-20
1990-06-19
Richardson, Robert L.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 13, 369 4421, 360144, G11B 700
Patent
active
049359118
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.
REFERENCES:
patent: 4733065 (1988-03-01), Hoshi et al.
(47th Scientific Lecture of the Applied Physical Academy) p. 227; 9/27/86 "Analysis of Signal Reproduced from Optical Disc Using Method of Superposition of Wavefronts", Yukinori Okazaki, Ryoichi Imanaka and Yoshihiro Okino (30a-ZE-10).
(47th Scientific Lecture of the Applied Physical Academy) "Small-Sized Optical Head Using a Plurality of Functional Hologram Lenses" Yasuo Kimura, Yuzo Ono, Naruto Sugama and Yoshio Ohta (30P-ZE-1).
(47th Scientific Lecture of the Applied Physical Academy( "Method of Speerating and Detecting Beam with Low Cross Talk for Multibeam Optical Head using an Array of Semiconductor Laser" Masataka Itoh, Kenji Endo and Ohta (30P-ZE-2).
Nikkei Electronics 1986. 11. 3 No. 407 "Optical Head for Optical Disc using Hologram Device to Decrease the Number of Parts". pp. 86-87, Oct. 3, 1986, Kazuichi Tada and Kaoru Fushiki.
A Paper for the 22nd Lecture of the Scientific Research Society for Microoptics, pp. 38-44 Dec. 21, 1986.
Baba Nobuyuki
Fujita Kazuhiro
Inokuchi Toshiyuki
Maeda Hideo
Ohuchida Shigeru
Richardson Robert L.
Ricoh & Company, Ltd.
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