JPS5569875A - Reader for optical information - Google Patents

Reader for optical information

Info

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
Application number
JP14249078A
Other languages
Japanese (ja)
Inventor
Izuru Haruhara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP14249078A priority Critical patent/JPS5569875A/en
Publication of JPS5569875A publication Critical patent/JPS5569875A/en
Pending legal-status Critical Current

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
JP14249078A 1978-11-19 1978-11-19 Reader for optical information Pending JPS5569875A (en)

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)

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