Detector for scanning start position
专利汇可以提供Detector for scanning start position专利检索，专利查询，专利分析的服务。并且PURPOSE: To obtain a detector for scanning start position which is not affected by the change of the detector output by installing the optical scanning part with two units of the adjacent photo detectors, the differential amplifier, two pairs of threshold amplifiers, the level conversion circuit and the logical product circuit each.
CONSTITUTION: When the scanning light moves from left to right as shown in the figure to photo detector 1 and 2, the output of differential amplifier 3 changes as a', b' and c'. Thus the waveform features the sine wave as shown in A. Now, it is supposed that the output of 3 varies as shown in B due to the intensity of the irradiation light arriving at element 1 and 2, the temperature characteristics of the element and other factors. In this case, however, both A and B feature the same timing to cross OV from the positive to negative regions. The output of amplifier 4 featuring threshold voltage VTH and VTH
2 features like C and D, and the output of inverse amplifier 5 featuring the TH voltage at OV becomes like E and F respectively. This signal passes through level conversion circuit 6 and 7, and its output features G and H at logical product circuit 8 with exactly same rise point of the signal. Thus, no effect of the output change of element 1 and 2 is given at all.
COPYRIGHT: (C)1979,JPO&Japio，下面是Detector for scanning start position专利的具体信息内容。
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