| 摘要 |
An optical scanner that obtains precise and clear image information independent of a position for scanning an object. A plurality of light receiving parts are each composed of a photodiode, for detecting the image information of reflected light, and a detecting lens structured so that the beam diameter of the reflected light at the paired photodiode is larger than a beam diameter w0 expressed by: w0=1.22x2l2 lambda /W, where lambda :Wavelength, W:Exit pupil diameter of imaging means, l2:Image point position, and as the imaging means is an optical element, the principal plane of which is approximately equivalent to the top of the plane, signal variation in a state in which reflected light outside of the photodiodes is reduced.
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