Optical transducer and focusing system

Details Optical transducer and focusing system Optical transducer and focusing system

1978-05-26

1979-05-01

Tokar, M.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250204, 1791003V, G01J 120

Patent

active

041525868

ABSTRACT:
An optical transducer having concentric radiant beam detectors for converting a radiant beam to electrical signals including a first axially placed detector with a second detector concentric therewith. In one embodiment, the detectors receive the radiant beam through an amplifying auxiliary lens. Changes in focus differentially affect the magnitude of the beam impinging on the individual detectors, resulting in corresponding changes in the individual detector outputs.
A focusing system employing the transducer moves a focusing lens in response to the differential output of the individual detectors. The focusing system can be employed in a video disc reading system so that the video disc scanning beam is always focused precisely at the disc. An electrical difference circuit leading from the photo-detectors generates a driving signal to energize a lens-moving motor for shifting the focusing lens along the axis of the beam.

REFERENCES:
patent: 3454772 (1969-07-01), Vitt, Jr.
patent: 3596101 (1971-07-01), Someya
patent: 3721827 (1973-03-01), Reinheimer
patent: 3757124 (1973-09-01), Kaestner
patent: 3876841 (1975-04-01), Kramer
patent: 3890499 (1975-06-01), Lippel
patent: 3974327 (1976-08-01), Dijk
patent: 3997715 (1976-12-01), Elliott
I.B.M. Technical Disclosure Bulletin, A. Frosch, et al., vol. 15, No. 2, (Jul. 1972), at 504,505.

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