| 摘要 |
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.
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