LIGHT SOURCE OF OPTICAL INFORMATION READER

摘要

PURPOSE:To attain the arrangement of point light sources in an identical pitch by applying a different current to a light source arranged near the optical axis of an optical system and a light source arranged at a circumference part apart from the optical axis. CONSTITUTION:LEDD1-Dn are arranged in the same pitch. The degree of reduction in the luminous amount is calculated and the current fed to the LEDD1- Dn is made different by using different values of current limit resistors at each position to the optical axis. Thus, the luminous intensity of the LEDD1-Dn is made different so as to constitute an original plane illuminance distribution thereby correcting the decrease in the luminous amount. As a result, the original plane illuminance distribution is realized by arranging the LEDs in the same pitch and one kind of the power supply is enough.