Automatic range control method for an optical density/dot percentage measuring device
AssigneeDai Nippon Insatsu Kabushiki Kaisha
InventorsYuji Kobayashi, Norio Takahashi
Life of this patent
Estimating the term…
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.
Claims6
A compact light source device for a transmission light measuring apparatus having a flat surface for placing an object to be measured and an illumination section at a corner of said flat surface, comprising:
- a measuring apparatus housing formed on the rear side of said flat surface for housing said measuring apparatus;
- and a light source housing section formed on the rear side of said flat surface for housing light source elements including a battery and a lamp, and optical system means;
- wherein light from said light source housing is applied to said illumination section at said flat surface.
Dependencies are inferred from the claim text.