Optical sensor with a counter for counting items and...

Details Optical sensor with a counter for counting items and... Optical sensor with a counter for counting items and...

2011-03-22

2011-03-22

Le, Que T (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S2140RC, C250S22300B

Reexamination Certificate

active

07910903

ABSTRACT:
An optical sensor comprises: a light source located on one side of a transport path; a variable current drive, an optical receiver in communication with the variable current drive, and located on an opposite side of the transport path to the light source and aligned therewith to detect light output therefrom; and a memory coupled to the variable current drive. The variable current drive is suitable for energising the light source so that the light intensity from the light source increases with increasing current. The variable current drive includes (i) a drive circuit for applying a pulse of current to the light source, during which pulse the light source is energised; and (ii) a counter for increasing the amount of current applied by the drive circuit during a pulse of current. The memory may be arranged to store a value from the counter indicative of a number of media items present in the transport path.

REFERENCES:
patent: 4352013 (1982-09-01), Fasig et al.
patent: 4737627 (1988-04-01), Hughes et al.
patent: 7049572 (2006-05-01), Jespersen et al.

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