Method and apparatus for automatic modulation of...

Details Method and apparatus for automatic modulation of... Method and apparatus for automatic modulation of...

2007-11-06

2007-11-06

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S205000

Reexamination Certificate

active

10799850

ABSTRACT:
A code strip, an optical encoder using such a strip and a method thereof are described. The code strip includes a calibration area. Light transmitted from a light source through the calibration area on the code strip is converted into an electrical calibration signal. This signal is a function of the transparency of the calibration area. The brightness of the light source is automatically modulated to compensate for degradation of transparency of the calibration area.

REFERENCES:
patent: 4224514 (1980-09-01), Weber
patent: 5015836 (1991-05-01), Van Antwerp
patent: 5998783 (1999-12-01), Stridsberg
patent: 6483104 (2002-11-01), Benz et al.
patent: 6653620 (2003-11-01), Blasing et al.

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