Apparatus for optically recording data into a disc

Details Apparatus for optically recording data into a disc Apparatus for optically recording data into a disc

1998-06-01

2000-09-05

Edun, Muhammad

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369112, 369 54, 369 94, G11B 700

Patent

active

061153362

ABSTRACT:
There is provided an apparatus for optical recording, reproducing and erasing data into or from a recording medium, including an optical head for recording, reproducing or erasing data into or from a recording medium by emitting a light to the recording medium, the optical head including at least an objective lens and a laser diode, a sensor for sensing a thickness of the recording medium, and a focal distance compensator for varying a focal distance of the light in accordance with a thickness sensed by the sensor, the focal distance compensator including a convex lens located between the objective lens and the laser diode and designed to be able to located in or out of an optical path. In accordance with the above-mentioned apparatus, a thickness of a recording medium is readily measured by the sensor, and the focal distance compensator adjusts a focal distance of a light emitted from the light source in accordance with the measured thickness of a recording medium. Hence, it is always possible to properly record, reproduce and erase data into or from a recording medium.

REFERENCES:
patent: 5446565 (1995-08-01), Komma et al.
patent: 5787062 (1998-07-01), Mochizuki
patent: 5793734 (1998-08-01), Tsuchiya et al.
Japanese Office Action, dated Aug. 31, 1999, with English language translation of Japanese Examiner's comments.

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