ILLUMINATION OPTICAL SYSTEM OF IMAGE CAPTURING DEVICE

摘要

Provided is an illumination optical system of an image capturing device, which is compact and low cost and achieves a reduction in specular noise. An illumination optical system (20) of an image capturing device applies light to an object (11), an image of which is to be captured, in order to receive reflected light from the object (11) by an image sensor (12) and capture the image of the object. The illumination optical system comprises a plurality of LEDs (14) disposed around the image sensor (12), and a ring-shaped prism plate (22) with a prism surface (24) facing the plurality of LEDs (14) in order to apply light from the plurality of LEDs (14) to the object (11), the prism surface having circumferentially formed thereon a prism row comprising multiple ridge lines (23) in a radial direction.