Compact disc counter arranged to minimize counting errors having

Details Compact disc counter arranged to minimize counting errors having Compact disc counter arranged to minimize counting errors having

1993-04-23

1994-05-24

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250561, H01J 4014

Patent

active

053151070

ABSTRACT:
Apparatus for counting compact discs stacked on a spindle with outer portions of adjacent discs normally separated by gaps formed by central bosses of the discs in which the stack is moved vertically through the space between transmitting optics which produce a pair of vertically spaced beams having a space therebetween equal to the distance between a pair of adjacent gaps of the stack and receiving optics including a detector which produces pulses in response to radiation from said beams which transverse the gaps. The time between a pair of successive pulses is measured and the second pulse of the pair is counted as two pulses when the measured time exceeds a predetermined time. The apparatus is arranged to operate with either of two types of spindles.

REFERENCES:
patent: 3936878 (1976-02-01), Chrysler
patent: 4803373 (1989-02-01), Imamura et al.
patent: 4994666 (1991-02-01), Higgison et al.
patent: 5032715 (1991-07-01), DeLise
patent: 5040196 (1991-08-01), Woodward

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