Self-calibrating label gap sensor circuit with a current regulat

Details Self-calibrating label gap sensor circuit with a current regulat Self-calibrating label gap sensor circuit with a current regulat

1996-08-20

1997-12-02

Le, Que

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

2505591, 372 29, G01J 132

Patent

active

056939310

ABSTRACT:
A label gap detection circuit comprises a photosensor having a light emitting element disposed at a first side of the print media and a light receiving element disposed at a second side of the print media so that light emitted by the light emitting element passes through the print media. The light emitting element provides a signal corresponding to an amount of light emitted therefrom and the light receiving element provides a signal corresponding to an amount of light received thereon. A regulator is coupled to the light emitting element for controlling an amount of light emitted by the light emitting element in response to a sum of the signals from the light emitting element and the light receiving element. An analog-to-digital converter is coupled to the light receiving element to receive the signal therefrom and provide a binary value corresponding to an amount of light received by the light receiving element. The label gap detection circuit is self-calibrating by use of current feedback from the light emitting and receiving elements of the photosensor to eliminate the need for potentiometers to calibrate the photosensor current level.

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