Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1996-02-15
1998-05-05
Tran, Thang V.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369112, G11B 700
Patent
active
057485810
ABSTRACT:
Disclose is a optical head having reduced elements and a simplified construction, thereby having a reduced size. In the optical head, the transmitting path of the optical beam is shortened and energy loss of the optical head is reduced. The optical head has a polygonal prism having a first and a second reflecting surfaces. The laser beam radiated from a laser source is reflected by the first reflecting surface and focused on an optical disc, and an information laser beam reflected by the optical disc is transmitted through or reflected by the first and the second reflecting surfaces, and then is incident upon the first and the second light-receiving regions of a single light-receiving element. The optical head records and reproduces information on and from the optical disc and performs a focusing servo and a tracking servo of the objective lens by utilizing data of the reflected information beam received by the first and the second light-receiving regions.
REFERENCES:
patent: 4817072 (1989-03-01), Toide et al.
patent: 5272685 (1993-12-01), Ando
patent: 5438562 (1995-08-01), Kobayashi et al.
patent: 5541906 (1996-07-01), Kobayashi
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