Camera with exposed frame detector

Details Camera with exposed frame detector Camera with exposed frame detector

1994-11-30

1997-07-15

Blankenship, Howard B.

Photography

With data recording

Magnetically on film or film cassette

G03B 1724

Patent

active

056492499

ABSTRACT:
A photographic film cartridge contains a photographic film having a magnetic recording layer and a single perforation per frame. The leader of the photographic film has multiple perforations and is advanced out of the cartridge as the film spool rotates. A camera has a magnetic head disposed on a film passage, and a film sensor. The magnetic head records photographic information on the magnetic recording layer in a magnetic area assigned to each frame, while the photographic film is moved lengthwise after a frame is exposed. The film sensor detects the corresponding single perforation to identify each frame. When a photographic film cartridge containing the photographic film with exposed and unexposed frames is reloaded in the camera, the magnetic head picks up the information recorded on the magnetic recording layer to check for the presence or absence of the information. From the mere presence of recorded information and a signal from the film sensor, the next-usable unexposed frame, following the last exposed frame, is detected and positioned in the exposure position. A partially exposed roll of film can thus be completely rewound into the cartridge, and later re-inserted into the camera, whereupon special cartridge structure ensures that the film leader will exit the cartridge and that its multiple perforations will be engaged by the film take-up spool.

REFERENCES:
patent: 4325092 (1982-04-01), Nethery et al.
patent: 4834306 (1989-05-01), Robertson et al.
patent: 4864332 (1989-09-01), Harvey
patent: 4878075 (1989-10-01), Cannon
patent: 4996549 (1991-02-01), Yamaguchi
patent: 5006873 (1991-04-01), Wash
patent: 5017326 (1991-05-01), Wash et al.
patent: 5174519 (1992-12-01), Oi et al.
patent: 5344730 (1994-09-01), Kitamoto

Affiliated with

Also associated with

Rating

Camera with exposed frame detector does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Camera with exposed frame detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Camera with exposed frame detector will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1500943