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

G - Physics

11

B

352/32.21, 352/3

G11B 7/00 (2006.01) G11B 7/09 (2006.01) G11B 7/12 (2006.01)

Patent

CA 1149062

LENS ASSEMBLY FOR A VIDEO RECORDER-PLAYBACK MACHINE ABSTRACT OF THE DISCLOSURE 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 instantan- eous 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.

380110

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