Mid-roll change for film having edge perforations and magnetic l

Details Mid-roll change for film having edge perforations and magnetic l Mid-roll change for film having edge perforations and magnetic l

1996-12-04

1998-03-31

Metjahic, Safet

Photography

With data recording

Magnetically on film or film cassette

396320, 396390, 396392, G03B 1724

Patent

active

057349428

ABSTRACT:
In a camera having an exposure gate and a transport for transporting film past the exposure gate, the film having a series of perforations along at least one edge of the film, wherein the number of the perforations are an integer per exposure frame, the film having a substantially transparent magnetic layer at least in the region of the perforations, a mid-roll change apparatus. The mid-roll change apparatus includes a source of a steady-state magnetic field located downstream of the exposure gate and adjacent to the series of perforations for magnetizing the magnetic layer between the perforations as film is transported past the source; a magnetic field sensor located upstream of the exposure gate and adjacent to the series of perforations for sensing fringing magnetic fields emanating from perforation edges, the area between which have been magnetized; and a perforation sensor located to sense the series of perforations of the film.

REFERENCES:
patent: 4860037 (1989-08-01), Harvey
patent: 4996546 (1991-02-01), Pagano et al.
patent: 5005031 (1991-04-01), Kelbe
patent: 5016030 (1991-05-01), Dwyer et al.
patent: 5272498 (1993-12-01), Wakabayashi
patent: 5307100 (1994-04-01), Kubo
patent: 5321452 (1994-06-01), Tsujimoto
patent: 5583591 (1996-12-01), Saito et al.

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