| 摘要 |
A data symbol reading apparatus, for reading an encoded data symbol, includes: an image pickup element; an image forming optical system for forming an image of the encoded data symbol located within a symbol read area onto a light-receiving surface of the image pickup element; and an illumination system. The illumination system includes a plurality of light sources, a diffusion plate for diffusing light emitted from the light sources, and a lens member for transmitting diffused light diffused by the diffusion plate onto the symbol read area. The plurality of light sources, the diffusion plate, and the lens member are arranged such that a light distribution within the symbol reading area is almost uniform.
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