JPS5569875A - Reader for optical information - Google Patents
Reader for optical informationInfo
- Publication number
- JPS5569875A JPS5569875A JP14249078A JP14249078A JPS5569875A JP S5569875 A JPS5569875 A JP S5569875A JP 14249078 A JP14249078 A JP 14249078A JP 14249078 A JP14249078 A JP 14249078A JP S5569875 A JPS5569875 A JP S5569875A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- output
- comparator
- read
- digital
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
PURPOSE: To make it possible to read correct binary signals at any time by supplying a signal, based upon the output signal of a photoelectric converter, and another signal with needed delay behind the above signal to a comparator with hysteresis characteristics.
CONSTITUTION: The reflected light of light from source LS is detected by photoelectric converter PE, a signal from which is sent to amplifier A. The output of amplifier A is converted into a digital signal by ADC. As a relay circuit, digital signal delay circuit DLd is used which consists of registers SR1 to SRn, and as a comparator, digital comparator HCd with hysteresis characteristics is used. In this constitution, a signal based upon the output of photoelectric converter PE and another signal lagging the signal as much as required are inputted to digital comparator HCd to obtain a read output, so that even if a distance between a recording medium and PE would vary, a binary signal will be read through a comparison with a signal right before the variation. Invariably-correct binary signals can therefore be read out.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14249078A JPS5569875A (en) | 1978-11-19 | 1978-11-19 | Reader for optical information |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14249078A JPS5569875A (en) | 1978-11-19 | 1978-11-19 | Reader for optical information |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5569875A true JPS5569875A (en) | 1980-05-26 |
Family
ID=15316527
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14249078A Pending JPS5569875A (en) | 1978-11-19 | 1978-11-19 | Reader for optical information |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5569875A (en) |
-
1978
- 1978-11-19 JP JP14249078A patent/JPS5569875A/en active Pending
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