Optical card analyzing apparatus

Details Optical card analyzing apparatus Optical card analyzing apparatus

1988-08-02

1991-06-25

Richardson, Robert L.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 58, G11B 700

Patent

active

050273396

ABSTRACT:
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.

REFERENCES:
patent: 4727531 (1988-02-01), Ito et al.
patent: 4787075 (1988-11-01), Matsuoka et al.
patent: 4870633 (1989-09-01), Matsushita et al.
patent: 4872154 (1989-10-01), Sakagami et al.
Patent Abstracts of Japan, vol. 4; No. 103 (P-020) July 23, 1980; JP-A-55 062533 (Matsushita Electric Ind. Co. Ltd.) May 12, 1980.
Patent Abstracts of Japan, vol. 9; No. 190 (P-378) (1913) Aug. 7, 1985; JP-A-60 059539 (Matsushita Denki Sangyo K.K.) Apr. 5, 1985.

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