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US 4,063,266 AGranted
Adjustable polarized filters for cameras
OwnerRobert R. Thomas, Camille C. Thomasinventors
Life of this patent
Estimating the term…
Abstract
Filter case rotatably carries two filter retainers each with a linearly polarized filter, each at the same angular position. A perforated belt engages around the sprocket teeth on the filter retainers so that the two filters are rotated together. Filter case is removably attached to the camera body.
Claims7
Adjustable polarized filters for cameras comprising:
- a filter case, means on said filter case for detachable attachment of said filter case on a camera body;
- an aperture in said filter case positioned to be in front of the viewfinder and another aperture in said filter case positioned to be in front of the lens of the camera when said filter is mounted on the camera body;
- a cylindrical boss around each of said apertures;
- first and second polarized filters in said filter case;
- a pair of filter retainers, each of said filter retainers being formed of a cylindrical shell and an inwardly directed flange, each said filter being positioned inside said shell and secured against said flange so that each said filter rotates with its filter retainer, said filter retainers being respectively mounted on said bosses so that said polarized filters are positioned in said filter case for being positioned over the viewfinder and over the photographic lens of the camera when said filter case is mounted on a camera body;
- and
- a belt connected around said filter retainers, means engaging said belt for manual movement of said belt so that, upon motion of said belt, both of said filters rotate the same angular amount.
4 more elements
Dependencies are inferred from the claim text.