Compensation method for variable magnification in an optical zoo

Details Compensation method for variable magnification in an optical zoo Compensation method for variable magnification in an optical zoo

1991-05-31

1992-05-26

Moses, R. L.

Photocopying

Projection printing and copying cameras

Methods

355 55, 355243, G03G 1500

Patent

active

051172569

ABSTRACT:
In a method for compensating a variable image magnification in an optical zoom system, a magnified image is formed on a focal surface by projecting a document image through a projection lens and onto mirrors provided to an optical path length adjusting device. The position of the projection lens and the optical path length adjusting device are compensated so that an actual image magnification is the same as a selected nominal image magnification. An optional nominal magnification within a predetermined variable magnification range is selected. At least one of the projection lens and the variable optical path length adjusting device is moved so as to be in focus and then an actual image magnification at a position where the projection lens is in focus is measured. An actual focal length of the projection lens is calculated from the measured magnification according to equations with respect to magnification, focal length, principal points and so on. Each compensating position of the projection lens and the optical path length adjusting device in accordance with the selected magnification is determined, based on the calculated focal length and the optional nominal magnification.

REFERENCES:
patent: 4571064 (1986-02-01), Hayashi et al.
patent: 4766466 (1988-08-01), Kawal

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