Exposure control system with braking capability
CA 1075520 A · Owner: Polaroid Corporation · Inventors: Muggli, Juerg; Shenk, Edwin K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to a photographic apparatus which includes an exposure control system having shutter blade elements with respective selectively shaped aperture openings therethrough which, depending upon the position of the blades, symmetrically overlap over a light entering exposure opening within the camera to define an effective scene light admitting aperture. During an exposure interval the blades move simultaneously in correspondence with each other to define a progressively variable effective aperture opening over the camera light entering opening. The exposure control system additionally includes exposure control circuitry having a photoresponsive element therein as well as …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted April 15, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 15, 1997.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.