Inventors:
Eric Walowit - Springboro OH
Ronald J. Duke - Centerville OH
Victor L. Iseli - Cincinnati OH
Long B. Sam - West Chester OH
Assignee:
Color Savvy Systems Limited - Springboro OH
International Classification:
G01J 328
G01J 318
H04J 1500
Abstract:
A sensor for measuring reflective, transmissive, or self-luminous samples, comprises a plurality of light sources, where each of the light sources emit light of a substantially different wavelength band spaced in the visible spectrum; a reference channel photodetector; a sample channel photodetector; an optical cap adapted to direct a first portion of the light emitted by each of the light sources to the reference channel photodetector, a reflector cone for directing a second portion of the light emitted by each of the light sources to the sample; and a receptor piece for directing the diffuse portion of the light reflected from the sample to the sample channel photodetector. Preferably, the reference channel and sample channel photodetectors are identical devices and are mounted back-to-back to share environmental characteristics, and in turn, minimize the variation between their respective responses. The sensor is preferably incorporated into a hand-held "mouse" device, which includes an area on its top surface for seating an index finger of the human hand. Positioned within this area is a pressure-activated switch that is operatively coupled to the sensor circuitry for performing the various readings.