Microfilm search device

Photocopying – Projection printing and copying cameras – Identifying – composing – or selecting

Patent

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Details

355 41, 353 25, 353 26A, G03B 2752, G03B 2302, G03B 2312

Patent

active

060942533

ABSTRACT:
There is disclosed a microfilm search device for detecting the presence of frames from a density change in the running direction of a microfilm, in which even if a frame contains therein a portion having substantially the same density as that of an interspace between frames, the portion is prevented from being incorrectly determined as between-frames, and frames are correctly detected to prevent a search error. The device is provided with an encoder for outputting a sampling signal for each predetermined feeding amount of the microfilm; plural density sensors for detecting a film density in different positions along a width direction within a frame travel width to output density signals; a binarizing section for binarizing the density signals into binarized signals having a logic ZERO or ONE in synchronization with the sampling signal; a determination section for detecting the presence of frames using a logical product or a logical sum of the plural binarized signals to output a determination signal; and a searching section for searching for a desired frame based on the determination signal.

REFERENCES:
patent: 4453823 (1984-06-01), Sugita et al.
patent: 4611907 (1986-09-01), Inatsuki
patent: 5354994 (1994-10-01), Hicks
patent: 5416605 (1995-05-01), Hideshima et al.
patent: 5570206 (1996-10-01), Yoshinaga
patent: 5590941 (1997-01-01), Hideshima
patent: 5758939 (1998-06-01), Ochiai et al.

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