Information code and its reading device

A reader for an information code comprising:

• a filter for separating reflected light or radiated light from said information code according to a difference in wavelength band, said information code being formed by arranging three or more types of display areas in a predetermined arrangement, said display areas being different in reflected or radiated wavelength characteristic;
• a plurality of detectors for photo-electrically converting light in every wavelength band separated by said filter;
• a plurality of determination circuits for determining whether an output from each of said detectors exceeds a predetermined determination level;
• and
• a decoder for decoding information displayed by said information code, based on a combination of said outputs from said determination circuits, and outputting said information decoded.

A reader for an information code comprising:

• a plurality of monochromatic light sources provided so as to correspond to said information code being formed by arranging three or more types of display areas in a predetermined arrangement, said display areas being different in reflected or radiated wavelength characteristic, and so as to correspond to said different wavelength characteristics of said display areas;
• a driving circuit for light-emitting each said monochromatic light source by timesharing;
• a detector for photo-electrically converting said reflected light or said radiated light from said information code;
• a determination circuit for fetching an output from said detector at every wavelength band component in synchronization with a driving signal from said driving circuit, determining whether said output at said every wavelength band component exceeds a predetermined determination level, and further determining which wavelength band component is included in said output, based on said determination;
• and
• a decoder for decoding information displayed by said information code, based on a combination of outputs from said determination circuit, indicative of respective colors of emitted light, to thereby output a decoding result.

A reader for an information code formed by three or more types of display areas in a predetermined arrangement, said display areas being different in reflected or radiated wavelength characteristic, comprising:

• three different monochromatic light sources for emitting light in three different wavelength bands, respectively;
• a driving circuit for light-emitting each said monochromatic light sources by timesharing;
• a detector for photo-electrically converting said reflected light or said radiated light from said information code;
• an A/D converter for fetching an output from said detector at every wavelength band component in synchronization with a driving signal from said driving circuit, and converting said output at said every wavelength band component into a digital value;
• and
• a decoder for comparing a ratio of a received light quantity of each color output by said A/D converter with a previously registered ratio of a received light quantity of said each color, and determining that a bar color is equal to a color being closest in ratio.