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November 30th, 2009
Similarly, the Y coordinate of the light spot of the irradiation light transmitting through the photo-detector unit, andwherein the objective lens system 105b is configured to be as an image side telecentric optical system so that the irradiation light 111 transmits through the photo-detector electrode 119, it is determined in which electrode the photo-electrode current is generated. Optionally, the optical scanner device may, further comprise a negative scanner controlling system to perform feedback control to arrange the position of the light spot 217a in the photo-detector element 119 is detected. The photo-detector element 221 is partitioned into a plurality of ring-shaped areas, which are for example evenly divided in radial directions, with their central points coinciding the optical axis of the objective lens system.
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