Recording medium mark detector

Details Recording medium mark detector Recording medium mark detector

1985-09-19

1987-05-12

Laroche, Eugene R.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

353 26A, G06K 710

Patent

active

046653180

ABSTRACT:
A mark detecting apparatus for detecting marks provided on a recording medium has a photoelectric converting device for receiving a light from the base and marks on the recording medium, a first setting device for setting a first predetermined reference value, a second setting device for setting a second reference value corresponding to the output of the photoelectric converting device, and a detecting device for selecting one of the first reference value and the second reference value and comparing the selected reference value with the output of the photoelectric converting device to thereby detect the presence or absence of the marks.

REFERENCES:
patent: 3885866 (1975-05-01), Stearns
patent: 3999846 (1976-12-01), Sone et al.
patent: 4436391 (1984-03-01), Kashiwagi
patent: 4514641 (1985-04-01), Tanaka et al.

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