The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 29, 1980
Filed:
Dec. 21, 1977
Edwin H Land, Cambridge, MA (US);
Polaroid Corporation, Cambridge, MA (US);
Abstract
A system for spatially stabilizing the field of view of a photocell on a camera includes a ring mounted for pendulous movement about its central axis, parallel to the optical axis of the camera objective, a photocell lens mounted on the ring for limited pendulous movement about an axis perpendicular to the ring axis, and a photocell for receiving light passed by the lens from the scene being photographed. The pendulously mounted ring provides a roll sensitive control that maintains the field of view of the photocell, as determined by the photocell lens, in a fixed position in response to rotation of the camera about its optical axis while the pivotal lens mounting provides a pitch sensitive control that maintains the field of view of the photocell in a fixed spatial position in response to changes in the elevation angle of the camera. In one arrangement, a neutral density wedge, interposed between the lens and the photocell, is oriented so that its density gradient is aligned with the direction in which the ring is pendulously weighted such that the wedge modifies the light input transmitted to the photocell so as to make its output vary with respect to the camera elevation angle.