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:
Dec. 23, 1997
Filed:
Dec. 03, 1996
Garret J Caterino, Maynard, MA (US);
Patrick W Hopkins, Chelmsford, MA (US);
Elliott S Strizhak, Millis, MA (US);
Polaroid Corporation, Cambridge, MA (US);
Abstract
A camera shutter and focus encoder assembly comprises an encoder mask fixed in a camera housing and having an arcuate window having alternating opaque and transmissive portions, and an encoder sheet mounted in the housing in abutting relationship with the encoder mask, the encoder sheet being movable with exposure blades and the focus lens of the camera and having an arcuate window having alternating opaque and transmissive portions therein. Means are provided for pressing the encoder mask and the encoder sheet together with the mask and sheet windows in registration with each other. A sensor passes pulses of light through the mask and sheet windows when the transmissive portions thereof are in registration and detects the pulses of light, converts the light pulses to electrical signals, and transmits the electrical signals. A controller receives the electrical signals and determines therefrom the position and direction of movement of the shutter blades, compares the blade position and movement direction with a preselected program and sends to a motor a signal instructing any required compensating shutter blade movement change, and in like manner monitors the focus assembly and sends to the motor a signal instructing any required compensating lens movement change.