Optical viewing apparatus
OwnerMartin Raymond Percival Seibinventor
Life of this patent
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Abstract
An improved microfilm reader/printer is described having a back-projection screen and which permits permanent copies of input material to be produced at magnifications varying between minimum and maximum limits. The viewing screen is too small to accommodate the entire image in both height and width dimensions at the maximum magnification but is positioned and dimensioned to receive all of a maximum sized image in one of those directions. Preferably the screen is large enough to accommodate the full image in both directions at the minimum magnification.
Claims8
A view/print apparatus comprising a casing, a back-projection viewing screen forming part of the casing on which an image to be viewed is projected from within the casing, image projection means, a print plane on which a light-sensitive sheet of image recording material is located for exposure to said image when the print facility is to be employed, a mirror movable between "view" and "print" positions, in the former of which said image is projected on the screen with a selected accuracy of focus and in the latter of which said image is projected on the print plane with substantially no change in the accuracy of focus, and means to vary the size of said image up to a maximum rectangular frame size, characterised in that the screen is dimensioned and positioned in the casing to accommodate only a part of said image when the size-varying means is set for maximum frame size, that part including one complete edge of the maximum sized frame and a region adjacent thereto.
Dependencies are inferred from the claim text.