Exposure identification accessory

Details Exposure identification accessory Exposure identification accessory

1978-07-03

1980-01-08

Gonzales, John

G03B 1724

Patent

active

041825594

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.

REFERENCES:
patent: 2403911 (1946-07-01), Crowley
patent: 3082424 (1963-03-01), Laird
patent: 3267555 (1966-08-01), Berger et al.
patent: 3463064 (1969-08-01), Klingenstein
patent: 3843956 (1974-10-01), Kauneckas
patent: 3916423 (1975-10-01), Ueda et al.
patent: 4001846 (1977-01-01), Kauneckas
patent: 4096486 (1978-06-01), Pfeifer et al.
Appel et al., Data Recording Apparatus for Cameras, Nov. 1977 IBM Technical Disclosure Bulletin 354-106

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