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. 08, 1980
Filed:
Jul. 03, 1978
John J Driscoll, Andover, MA (US);
Nicholas Gold, Arlington, MA (US);
Polaroid Corporation, Cambridge, MA (US);
Abstract
An accessory adapted for selective attachment to a film cassette for photographically recording indicia on a film unit within the cassette. The accessory includes a base plate having an integrated circuit (IC) chip mounted thereon, a light emitting diode (LED) display and pair of spring clips for electrically and structurally interconnecting the base plate and the display in spaced parallel relation. A pair of electrical contacts extend outwardly from the base plate for connecting the IC chip with the terminals of a battery when the accessory is attached to the film cassette. A collimating screen is mounted on the surface of the LED display facing the base plate such that when the accessory is attached to the cassette the base plate is in engagement with the rear wall of the cassette and the collimating screen extends into an exposure aperture in the cassette'forward wall and into engagement with an opaque cover sheet located within the cassette. Subsequent to the loading of the cassette into a camera, the cover sheet is removed from the cassette and the first of a plurality of film units is urged into its exposure position with a small corner portion of its exposure surface in engagement with the collimating screen. When the IC detects an electrical load on the cassette's battery, it momentarily directs a flow of current from the cassette's battery to the LED display thereby illuminating the display so as to photographically record the indicia on the film unit being exposed. In a preferred embodiment, the indicia represents the date of the exposure and therefore the accessory includes its own battery for driving the display's timing circuit. Alternatively, the indicia represents the aperture setting and/or the speed of the camera's shutter.