发明名称 |
Optical card analyzing apparatus |
摘要 |
There is provided an optical card information recording/playing back apparatus comprising: an optical system for irradiating a light beam for reproducing recorded information onto information recording tracks of the optical card on which pit trains indicative of recording information are formed; a photo detector for receiving the reflected light from the optical card and outputting a photo sensing signal; a pit correspondence signal producing circuit for detecting a peak of the photo sensing signal and producing a pit correspondence signal which changes in correspondence to a pit position on the basis of the result of the peak detection; a frequency/voltage converter for converting a frequency of the pit correspondence signal to a voltage; and a discrimination signal producing circuit for comparing a voltage output of the frequency/voltage converter with a reference value and producing an information presence/absence discrimination signal.
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申请公布号 |
US5027339(A) |
申请公布日期 |
1991.06.25 |
申请号 |
US19880227336 |
申请日期 |
1988.08.02 |
申请人 |
OMRON TATEISI ELECTRONICS COMPANY |
发明人 |
YODA, SHIGERU;NITTO, KOUJI |
分类号 |
G11B7/0033;G11B19/04;G11B20/18;G11B27/36 |
主分类号 |
G11B7/0033 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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