Optical recording system having a rotating optical element provi

Details Optical recording system having a rotating optical element provi Optical recording system having a rotating optical element provi

1989-02-09

1992-03-17

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 97, 369112, G11B 700

Patent

active

050974572

ABSTRACT:
A single channel optical recording system is described, which system does not require a second rotating optical element. The system uses focus error correction components located outside the rotating drum. Light transmitted to and from the drum is at all times axially symmetric, thus circumventing the problem of image rotation. Lateral error correction takes place entirely within the drum, requiring only the transmission of d.c. electrical power across the rotating interface. Preferably the physical distribution of optical components within the drum is symmetric to ensure mechanical balance. A dual beam tracking system to write data in compact form in a single-channel optical tape recorder is also described. The tracking is achieved in the drum and without any additional optical elements. Passive or active alignment of the two beams before entering the drum is achieved using an extended anamorphic prism pair and without introducing additional optical surfaces into the beam path.

REFERENCES:
patent: 4425636 (1984-01-01), Musha et al.
patent: 4525828 (1985-06-01), Higashiyama et al.
patent: 4607359 (1986-08-01), Matsubayashi et al.
patent: 4633455 (1986-12-01), Hudson
patent: 4654549 (1987-03-01), Ando
patent: 4694447 (1987-09-01), Cohen et al.

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