Dynamic information storage or retrieval – Combined independent audio systems – Changeover between audio systems
Patent
1985-09-20
1988-09-20
Cardillo, Raymond F.
Dynamic information storage or retrieval
Combined independent audio systems
Changeover between audio systems
369 44, 369 45, 369 46, 369190, 358342, G11B 7095
Patent
active
047730528
ABSTRACT:
In a compatible recording and reproducing apparatus which is capable of recording and reproducing information on both a video disk and a digital audio disk, a relative angle between an optical axis of a laser beam emitted from a pickup and the disk is adjusted so as to be suitable for the disk loaded on the apparatus. Further, the movement of the pickup in the radial direction of the disk is regulated in accordance with the difference in the outer diameter of the two kinds of disks. A problem due to the difference of the track pitch in the two kinds of disks is solved by moving the pickup in a direction perpendicular to a radial direction of the disk. In addition, an objective lens for focusing the laser beam on the disk is selected within a predetermined range of an effective numerical aperture in order to simplify an optical system of the apparatus.
REFERENCES:
patent: 3002758 (1961-10-01), Bara
patent: 3966330 (1976-06-01), Ridler et al.
patent: 4462095 (1984-07-01), Chen
patent: 4532522 (1985-07-01), Tsumoda et al.
patent: 4575836 (1986-03-01), Seto
patent: 4607357 (1986-08-01), Okano
Pioneer CLD-900 description, 1985.
Sato Katsuharu
Sugiura Satoshi
Cardillo Raymond F.
Nguyen Hoa T.
Pioneer Electronic Corporation
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