Automatic range control method for an optical density/dot percen

Details Automatic range control method for an optical density/dot percen Automatic range control method for an optical density/dot percen

1985-10-08

1987-06-16

LaRoche, Eugene R.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

356443, H01J 4014, G01N 2100

Patent

active

046738070

ABSTRACT:
This invention relates to an automatic range control method for a compact and portable optical density/dot percentage measuring device which can use a conventional light table as its light source, and which can digitally display a result of measurement. In the method, information obtained from an A/D converter, which converts a measured analog signal to a digital signal, is positively employed for reducing overall measuring time. An A/D conversion is first made at x1 range by a 10 bit A/D converter. The A/D conversion value is compared with predetermined values to determine a gain to be selected and perform further A/D conversion.

REFERENCES:
patent: 4133008 (1979-01-01), Tisue
patent: 4426624 (1984-01-01), Beauducel et al.
patent: 4435679 (1984-03-01), Bedard
patent: 4574249 (1986-03-01), Williams

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