Lens assembly for a video recorder-playback machine

Details Lens assembly for a video recorder-playback machine Lens assembly for a video recorder-playback machine

1980-10-20

1983-12-20

Faber, Alan

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369111, 369 72, 350255, 384114, G11B 700

Patent

active

044221690

ABSTRACT:
A lens assembly is positionally adjusted for precisely focusing a light beam upon a video information disc in a video recorder-playback machine. The lens assembly includes a focusing lens supported on an air bearing within an assembly housing for movement toward and away from the disc. A current conducting coil is movable with the focusing lens and is adapted to receive an electrical current indicative of instantaneous focusing error of the light beam upon the disc. A fixed magnetic field formed by a permanent magnet mounted on the housing between opposite pole pieces comprising portions of the housing is magnetically coupled with the coil whereby variations in the current result in adjustment of the position of the focusing lens with respect to the disc to correct the focusing error.

REFERENCES:
patent: 3081682 (1963-03-01), Khoury
patent: 3154627 (1964-10-01), Wallis
patent: 4006294 (1977-02-01), Canino
patent: 4021101 (1977-05-01), Camerik
patent: 4106057 (1978-08-01), Van Vroenhoven
patent: 4349244 (1982-09-01), Hellriegel
Patent Abstract of Japan, vol. 2, No. 2, 1/13/79, p. 62 E83, JP-A-53129605.

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