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

1987-03-18

1988-04-19

Cuchlinski, Jr., William A.

Illumination

Light source and modifier

Including reflector

F01V 3300

Patent

active

047394595

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: 2157438 (1939-05-01), Sparks
patent: 3920311 (1975-11-01), Tsuda et al.
patent: 4292663 (1981-09-01), Martino et al.
patent: 4443835 (1984-04-01), Brautigam et al.
patent: 4447134 (1984-05-01), Rosenheck

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