Optical information writing and reading apparatus having two lig

Details Optical information writing and reading apparatus having two lig Optical information writing and reading apparatus having two lig

1994-07-14

1995-12-12

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4442, 369 44140, G11B 7095

Patent

active

054756650

ABSTRACT:
An apparatus for writing and reading information on and from an optical card by projecting a writing light beam and at least two reading light beams onto the optical card includes a first semiconductor laser for emitting a writing laser beam, a second semiconductor laser for emitting a reading laser beam, a diffraction grating for diffracting the reading laser beam into multiple reading laser beams, and an objective lens for projecting the writing laser beam and the reading laser beams onto the optical card. A reading laser beam spot is formed on the optical card at a middle point between two reading laser beam spots. Images of the reading laser beam spots are received by first and second light receiving elements, respectively. By processing output signals from the first and second light receiving elements, it is possible to verify the recorded condition of pits immediately after recording in regardless of a direction in which the optical card is moved. It is also possible to check the condition of the information track immediately before the writing. In this manner, the writing operation can be performed at a high speed in a suitable and reliable manner.

REFERENCES:
patent: 4432082 (1984-02-01), Hsieh et al.
patent: 4571716 (1986-02-01), Szerlip
patent: 4577301 (1986-03-01), Mathews et al.
patent: 5033040 (1991-07-01), Fujita
patent: 5267226 (1993-11-01), Matsuoka et al.

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