Method of and apparatus for measuring the movement of a lens wit

Details Method of and apparatus for measuring the movement of a lens wit Method of and apparatus for measuring the movement of a lens wit

1995-01-24

1996-02-20

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

25055929, 356375, 33701, H01J 4014

Patent

active

054931142

ABSTRACT:
A method and apparatus for measuring the linear movement between first and second substantially planar surfaces and is useful, for example, in an automatic focusing system of a photographic enlarging or printing machine. The linear movement between a first plane, e.g., a lens plane and a second plane, e.g., a film or print plane, at a single point, e.g., the lens optical center, is determined by measuring the linear movement of two diametrically opposed points proximate to the lens plane equidistant from the lens optical center. The two measured distances are then averaged to yield a distance measurement at the lens optical center corrected for any deflection of the lens plane.

REFERENCES:
patent: 5150169 (1992-09-01), Van Wagoner
patent: 5365059 (1994-11-01), Savage

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