Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Patent
1987-05-04
1988-10-25
Cardillo, Raymond F.
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
369 44, 369 54, 369 58, G11B 7095
Patent
active
047808659
ABSTRACT:
In an optical information reproducing apparatus for reproducing an information recorded on a recording surface of a disc-shaped record medium and which includes an optical pick up device mounted on a tiltable optical block and having a laser beam source for generating a laser beam and a photo detector for detecting the reflected beam from the recording surface and for reading the recorded information, a skew error detector mounted on the tiltable optical block for detecting skewing of the record medium and a skew error corrector controlled by the output of the skew error detector for controlling the optical block so that an optical axis of the pick up device is maintained perpendicular to the recording surface; the skew error detector includes diffused light source, a divided photo detector and a lens, the light source and the divided photo detector being arranged symmetrically with respect to an axis parallel with the optical axis of the optical pick up device, the light irradiated from the diffused light source and reflected from the recording surface being directed to the divided photo detector through the lens such that a real image of the diffused light source is formed on the divided photo detector, and the difference between the amounts of light detected by respective areas of the divided photo detector corresponding to the skew error output of the skew error detector.
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Cardillo Raymond F.
Eslinger Lewis H.
Sony Corporation
Young W. R.
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