Video disc player with rapid track access means

Details Video disc player with rapid track access means Video disc player with rapid track access means

1988-06-03

1990-01-30

Psitos, Aristotelis M.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

358342, 369 44, G11B 2710, G11B 2110

Patent

active

048978272

ABSTRACT:
In an optical disc playback unit a focused laser beam recovers audio and video information recorded on a spiral track on the disc surface for display. A pivotably mounted mirror in optical communication with the beam is actuated to assist the beam in radially following the spiral track during normal playback. Upon command of an external controller, the mirror actuator mechanism is actuated by a rapid track access circuit to cause the beam to be radially relocated from a present playback position on the disc to an alternate predetermined branch location, causing the display to change. A tracking circuit, responsive to movement of the beam over intervening tracks, causes the rapid track access circuit to decelerate the mirror as the beam approaches the branch location to provide accurate repositioning to the branch location.

REFERENCES:
patent: Re29963 (1979-04-01), Janssen
patent: 4106058 (1978-08-01), Romeas et al.
patent: 4138663 (1979-02-01), Lehureau et al.
patent: 4138741 (1979-02-01), Hedlund et al.
patent: 4330880 (1982-05-01), Van Dijk
patent: 4539664 (1985-09-01), Deguchi et al.
patent: 4567534 (1986-01-01), Groen et al.
patent: 4630250 (1986-12-01), Nonomura
"A Random Access System Adapted for the Optical Video Disc: Its Input on Information Retrieval", Mathieu, SMPTE, Journal, Feb. 77, vol. 86, pp. 80-83, English translation of JP 57-69536.

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