CODE AND PORTABLE TERMINAL

摘要

PROBLEM TO BE SOLVED: To solve the problem that a code reader is possibly unable to read a code since the color of a case surrounding the display screen of a portable terminal device is higher in luminance than the color of the display screen or since the luminance outside the margin part of the displayed code is larger than the luminance of the margin part by the effect of the backlight source of the display screen. SOLUTION: This code is provided with optical information composed of a part having >=2 different kinds of luminance and a mark part which is provided outside the optical information and has a color lower in luminance than a margin part of nearly the same color with the high-luminance part of the optical information outside the margin part; even if the luminance of the circumference of the code is high, the margin part and the low-luminance color part of the optical information adjacent to the margin part can easily be discriminated when read by a code reader.