Apparatus for indicating maximum resolution for projected images
OwnerLouis Dzubaninventor
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Abstract
There is disclosed a maximum resolution indicator for photographic apparatus. The indicator utilizes a photocell which is scanned by a rotating disc having an aperture located on a surface thereof and communicating with the surface of the photocell. The output of the photocell is monitored to determine a maximum amplitude for high frequency components indicative of the content of the projected image. When the high frequency components as propagated through a high pass filter are of maximum amplitude, the system is at an optimum focusing point indicating to the operator that the image may be impressed upon a suitable film or that a picture can be taken in the case of a camera.
Claims7
Apparatus for providing an indication of maximum resolution indicative of an optimum focusing position for a photographic apparatus of the type operative to respond to an image located at a given plane from said photographic apparatus, comprising:
- (a) a single photocell located at said plane and positioned to intercept a portion of said image,
- (b) an opaque disc having a single radial slot therein with said slot being substantially smaller in area than half the area of said disc, and positioned in contact with said photocell to expose a predetermined portion of the surface of said cell to said image,
- (c) means coupled to said disc for rotating the same,
- (d) means coupled to the output of said photocell and responsive solely to high frequency components emanating therefrom during rotation of said disc, to provide a signal indicative of the amplitude of said components whereby a maximum amplitude indicates maximum resolution.
Dependencies are inferred from the claim text.