Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1991-07-19
1994-03-08
Nguyen, Hoa T.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369112, 369 13, 360114, G11B 1112, G11B 714, G11B 712
Patent
active
052933717
ABSTRACT:
In an optical head for a magneto-optical information reproducing apparatus, a light beam from a semiconductor laser is focused to a fine spot onto a magneto-optical recording medium. The light beam reflected by the recording medium is split by a splitting device into a first light beam having a polarization component in a direction of substantially 45 degrees with respect to a polarization direction of the semiconductor laser, and into a second light beam having a polarization component in a direction orthogonal to the above direction. The light beam splitting device includes an arrangement of a first glass, a uniaxial crystal and a second glass arranged in this sequence in the direction of incidence of the light beam. Normal lines to joint planes of the first glass and the uniaxial crystal, and the second glass and the uniaxial crystal, respectively, are in the plane in which the first and second light beams are contained, and the optical axis of the uniaxial crystal is set at substantially 45 degrees with respect to the polarization direction of the semiconductor laser.
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Canon Kabushiki Kaisha
Nguyen Hoa T.
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