Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1990-07-03
1992-05-12
Envall, Jr., Roy N.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4438, 369121, 369100, 369111, 2502015, G11B 700
Patent
active
051133857
ABSTRACT:
An optical disk cutting apparatus comprises an exposure optical system for expanding an exposure laser beam and for modulating the exposure laser beam in response to a signal to be recorded, and a focus servo optical system for expanding a focus servo laser beam and for detecting a reflected beam from a master recording disk through a polarizing means, in which one of the exposure and focus-servo optical systems the laser beam of which has a wave length longer than that of the other one includes a focusing lens provided in a stage preceding the objective lens for focusing the expanded laser beam. Therefore, it is possible to make the respective focal positions of the exposure laser beam and the focus servo laser beam be substantially the same and to obtain a small aberration by means of the difference in refractive index between laser beams.
REFERENCES:
patent: 4549287 (1985-10-01), Hatano et al.
patent: 4791625 (1988-12-01), Nakamura
patent: 4896313 (1990-01-01), Hirose et al.
patent: 4949331 (1990-08-01), Maeda et al.
Envall Jr. Roy N.
Pioneer Electronic Corporation
Tran Thang V.
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