Image focussing mechanism

Details Image focussing mechanism Image focussing mechanism

1974-11-04

1976-02-17

Rolinec, R. V.

Optics: measuring and testing

Lens or reflective image former testing

Focal length measuring

250201, 354 25, G01B 900

Patent

active

039388930

ABSTRACT:
A mechanism for determining the focus by an objective lens of an image on a focal plane includes a needle shaped or other narrow scanning mask transversely oscillated in the focal plane between the lens and a transversely extending photoelectric element exposed to the mask intercepted image. The output of the photosensitive element is coupled by way of a high pass filter or differentiating circuit and a rectifier to a meter, the maximum meter reading indicating maximum AC output and hence maximum focus. The output of the photosensitive element is also connected through a low-pass filter to a meter or exposed control mechanism.

REFERENCES:
patent: 3833806 (1974-09-01), Sato

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