Double beam optical head

Details Double beam optical head Double beam optical head

1995-09-13

1996-05-28

Nelms, David C.

Dynamic information storage or retrieval

Combined independent audio systems

Radio

369100, 369110, 369112, G11B 700

Patent

active

055218970

ABSTRACT:
A double beam optical head is so arranged that at least two optical beams are guided into an objective lens to be focused thereby to form at least two optical spots on an optical information recording medium and that two optical spots among optical spots are used to record and/or reproduce information with respect to the optical information recording medium. An optical system includes the objective lens and a light source for producing the two optical beams. The optical system is so arranged that, in guiding the two optical beams into the objective lens, the centers of the intensity distributions of the two optical beams are approximately symmetrically located with each other with respect to the optical axis of the objective lens. A magneto-optical recording and/or reproducing apparatus may be constructed of the optical head and a magnetic head for applying a magnetic field to the magneto-optical recording medium.

REFERENCES:
patent: 4641296 (1987-03-01), Mizunoe et al.
patent: 4654839 (1987-03-01), Eado
patent: 5329517 (1994-07-01), Yamaguchi et al.
patent: 5379285 (1995-01-01), Sugiura

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