Infrared illumination device for detecting paper path agitation, has microlens plate having microlenses arranged individually corresponding to ferrule of each optical fiber

摘要

The light irradiated by source (20) passes through several optical fibers (32). A ferrule is fixed to one end of each optical fiber and is inserted into the holes provided in the holder (28). A microlens plate (26) that is arranged between collecting lens and holder, has microlenses arranged individually corresponding to ferrule of each optical fiber.