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US 4,455,076 AGranted
Film supply cassette for camera processor
AssigneeMinnesota Mining and Manufacturing Company
InventorStephen P. Birkeland
Life of this patent
Estimating the term…
Abstract
A film supply cassette comprising a hub, axially spaced end flanges, a trailer secured to the hub having an opening to cooperate with a sensor, a length of light-sensitive film convolutely wound about said trailer, and a leader comprising a vapor coated polyethylene/polyester laminate bonded to paper and wrapped about the film between the flanges and being wider than the film.
Claims5
A film supply cassette comprising a support spool formed of opaque material and comprising a hub, a pair of end flanges, and hub sections for rotatably supporting the hub,
- a trailer secured to the hub and wrapped about the hub,
- a length of light sensitive film having one end connected to the trailer and convolutely wound upon itself, and
- a leader, formed of a laminate having a thickness of about 0.12 mm comprising a length of metal vapor-coated polyethylene film and a thin film of polyester, secured to the free end of the light-sensitive film and convolutely wound about the light-sensitive film between two and three times, said laminate having a width of 4 to 6 mm greater than the width of the light-sensitive film and greater than that of the spacing between the inner opposed surfaces of the end flanges and sufficiently thin to engage said opposed surfaces to form a seal between the flanges to restrict light from reaching the light-sensitive film.
A film supply cassette comprising
- an opaque support spool comprising a hub, a pair of end flanges, and hub sections for rotatably supporting the hub,
- a trailer secured to the hub and wrapped about the hub,
- a length of light-sensitive film having one end connected to the trailer and convolutely wound upon itself, and
- a leader, comprising a metalized opaque film and a length of paper, secured to the free end of the film and convolutely wound about said light-sensitive film, said metalized film comprising a length of vapor-coated polyethylene film 0.11 mm thick laminated to a 0.012 mm thick polyester film, and said metalized film is bonded to said length of paper which is 0.25 mm thick, the paper has a width corresponding to the light-sensitive film and a length to wrap convolutely about the light-sensitive film between 2 and 3 times and said metalized film has a width of between 4 and 6 mm greater than that of said light-sensitive film and greater than that of the spacing between the inner opposed surfaces of the end flanges to engage said opposed surfaces to form a seal between the flanges to restrict light from reaching the light-sensitive film.
1 more element
Dependencies are inferred from the claim text.