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US 5,023,641 AGranted
Pinhole camera with adjustable focal length
OwnerFrank J. Merrickinventor
Life of this patent
Estimating the term…
Abstract
The invention pertains to cameras and more particularly to pinhole cameras. A method is provided whereby the focal length of a pinhole camera may be adjusted by varying the distance between the pinhole, functioning as the lens, and the photographic paper, serving as film. This adjustment may be made by the user any time before exposure.
Claims4
A pinhole camera with an adjustable focal length comprising:
- an opaque camera housing;
- an opaque, removable camera end-cap slidably mounted on said camera body;
- a pinhole lens constructed of suitable material and attached to said camera end-cap;
- a photographic paper holder slidably mounted within said camera body so as to be slidable toward and away from said pinhole lens;
- a focal length adjustment rod attached to said photographic paperholder;
- said focal length adjustment rod projects from said camera body and includes markings which indicate to the user the position of said photographic paper holder within said camera body;
- a slide integrated into said camera body which allows said focal length adjustment rod to slide in and out of said camera body while preventing light from entering said camera;
- a handle attached to said focal length adjustment rod for use as a hand hold.
5 more elements
Dependencies are inferred from the claim text.