Optical pickup for information recording/reproducing apparatus h

Details Optical pickup for information recording/reproducing apparatus h Optical pickup for information recording/reproducing apparatus h

1995-08-14

1996-10-15

Young, W. R.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 44240, 369118, G11B 700

Patent

active

055661572

ABSTRACT:
An optical pickup for use in optically recording or picking up information on and from a recording medium using a light-emitting device. The optical pickup comprises first and second light reflecting surfaces disposed in opposed relation to each other, the first reflecting surface reflects a light beam from the light-emitting device and the second reflecting surface reflects the light beam reflected from the first reflecting surface. Around the first reflecting surface there is provide a grating lens which condenses the light beam reflected from the second reflecting surface to be focused on the recording medium. The light beam from the recording medium is reflected by the second reflecting surface to be directed to the first reflecting surface. The first reflecting surface diffracts the reflected light beam from the second reflecting surface toward a light receiving device to read the information concurrently detecting focusing and tracking error signals. This arrangement can achieve the size-reduction of the optical pickup.

REFERENCES:
patent: 4731772 (1988-03-01), Lee
patent: 4757197 (1988-07-01), Lee
patent: 5070494 (1991-12-01), Emoto et al.
patent: 5111448 (1992-05-01), Komma et al.
patent: 5113386 (1992-05-01), Whitehead et al.
patent: 5198916 (1983-03-01), Kim

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