Camera having a magnetic head and capable of detecting exposed f

Details Camera having a magnetic head and capable of detecting exposed f Camera having a magnetic head and capable of detecting exposed f

1991-11-01

1994-01-25

Gellner, M. L.

G03B 1724

Patent

active

052819876

ABSTRACT:
A camera with a processing device for reading information recorded on an information recording medium corresponding to each frame of film, and for writing information into the information recording medium, includes a control circuit for substantially erasing a subset of a plurality of data items pre-recorded on the recording medium for each frame, by writing information on the recording medium for each frame with the processing device, and a judgment circuit for (i) counting a number of non-erased data items on the recording medium for each frame, (ii) comparing the counted number with a threshold value, the threshold value being less than a number of the plurality of pre-recorded data items, and (iii) judging that the writing of information has not been performed by the processing means when the counted number is greater than or equal to the threshold value.

REFERENCES:
patent: 4864332 (1989-09-01), Harvey
patent: 4878075 (1989-10-01), Cannon
patent: 5006873 (1991-04-01), Wash

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