Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1989-10-25
1992-12-29
Young, Wayne R.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4432, 369112, G11B 7095
Patent
active
051757184
ABSTRACT:
An optical pickup apparatus includes a device for recording and reproducing information by changing a laser beam emitted from a semiconductor laser to a parallel light and by irradiating the parallel light to an optical information recording medium sequentially through a deflecting prism and an objective lens, a device for performing focusing and tracking servo controls by guiding a reflected light from the optical information recording medium to a servo optical system sequentially through the objective lens and the deflecting prism again, and a device for setting the positions of the deflecting prism and the objective lens such that the length of an optical path from a deflecting point of the deflecting prism to a main point of the objective lens is ranged from the focal distance of the objective lens to a length twice the focal distance of the objective lens.
REFERENCES:
patent: 4688201 (1987-08-01), Towner et al.
patent: 4822139 (1989-04-01), Yoshizumi
patent: 4823334 (1989-04-01), Tanaka et al.
patent: 5050152 (1991-09-01), Honda
patent: 5073888 (1991-12-01), Takahashi et al.
Cooper & Dunham
Young Wayne R.
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