Method and apparatus for measuring and/or setting lens focus dis

Details Method and apparatus for measuring and/or setting lens focus dis Method and apparatus for measuring and/or setting lens focus dis

1980-04-14

1981-08-04

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358227, 356125, H04N 702

Patent

active

042825482

ABSTRACT:
Lens testing apparatus and method by which the focus of a lens can be set to sharply image a distant object in a select focal or reference plane. The apparatus comprises a conventional television camera on which a lens can be mounted in a predetermined manner to focus light from a collimated light beam onto the photosensitive surface of the television camera tube. As the lens is adjusted, the area of the pattern of illumination formed by the lens on the photosensitive surface changes in accordance with the state of focus of the lens. The television camera scans the illuminated area and produces a video signal which is received by electronic circuitry that is operative to indicate the size of the area of the pattern of illumination as the lens state of focus is changed. The smallest area indicated corresponds to the best focus adjustment for the lens. Lens focal length also can be determined with the apparatus by making appropriate measurements when the smallest area is indicated.

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patent: 4011446 (1977-03-01), Swanberg
patent: 4070115 (1978-01-01), Humphrey
Smith, "Modern Optical Engineering", 1966.

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