Method of detecting a film with optical detecting means in photo

Details Method of detecting a film with optical detecting means in photo Method of detecting a film with optical detecting means in photo

1995-02-10

1996-12-17

Pendegrass, Joan H.

Photocopying

Projection printing and copying cameras

Identifying, composing, or selecting

2505591, G03D 1500, G03B 2752, G01N 2100

Patent

active

055858872

ABSTRACT:
A method of detecting a film with an optical detector in a photographic printer machine detects the presence of a film with the optical detector installed at a film detecting location where a light receiver receives an intensity of light from a light emitter. The method includes the steps of determining a setting of the film detector so that outputs of the light receiver are higher than a reference level prepared in a controller for judging the presence of the film and assigning the setting to the film detector so that the outputs of the light receiver have a sufficient margin as compared with the reference level. The initial setting for detecting the presence of a photographic film is thereby carried out without using any reference film.

REFERENCES:
patent: 4978858 (1990-12-01), Ellsworth et al.
patent: 5260740 (1993-11-01), Seto

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