Method for detecting F-number of lens

Details Method for detecting F-number of lens Method for detecting F-number of lens

1983-06-14

1985-07-30

Rosenberger, R. A.

Optics: measuring and testing

Lens or reflective image former testing

For optical transfer function

250201, 354406, 354432, G03B 1322

Patent

active

045318352

ABSTRACT:
A method for detecting optically an F-number of an interchangeable imaging lens is disclosed. An image of an exit pupil of the imaging lens is projected onto an array of photoelectrically converting light receiving elements so as to measure a diameter of the image of the exit pupil of the imaging lens formed on the light receiving element array. The diameter of the exit pupil image is measured by counting the number of the light receiving elements whose photoelectrically converted outputs are larger than a predetermined threshold value and then the effective F-number of the imaging lens is detected in accordance with said counted number. Further, an image lateral shift amount detected by an image lateral shift detection system is corrected by the detected F-number and an accurate focus detection of the imaging lens can be performed.

REFERENCES:
patent: 4373791 (1983-02-01), Araki

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