JPS5563478A - Optical reader - Google Patents

Optical reader

Info

Publication number
JPS5563478A
JPS5563478A JP13626778A JP13626778A JPS5563478A JP S5563478 A JPS5563478 A JP S5563478A JP 13626778 A JP13626778 A JP 13626778A JP 13626778 A JP13626778 A JP 13626778A JP S5563478 A JPS5563478 A JP S5563478A
Authority
JP
Japan
Prior art keywords
signal
bar code
peak hold
circuit
voltage
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
JP13626778A
Other languages
Japanese (ja)
Inventor
Tsutomu Koike
Tadao Kondo
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.)
Nippon Electric Industry Co Ltd
Original Assignee
Nippon Electric Industry 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 Nippon Electric Industry Co Ltd filed Critical Nippon Electric Industry Co Ltd
Priority to JP13626778A priority Critical patent/JPS5563478A/en
Publication of JPS5563478A publication Critical patent/JPS5563478A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To ensure the read-in of bar code, by picking up the bar code signal in which the voltage level of black and yellow bar is inverted from the voltage signal from the photo electric conversion element and obtaining the bar code signal having the pulse width at 1/2 level of this signal.
CONSTITUTION: After scanning the bar code with light ray and converting the reflection light into pulsive analog voltage signal through photo electric conversion, the information is read in with the conversion into digital signal. In such a unit, the first peak hold circuit 81 and the differential amplifiying circuit 82 take the difference between the said analog voltage signal a and its peak hold signal b to pick up the pulsive signal component C. Further, the second peak hold circuit 83, voltage division circuit 84, and comparison circuit 85 perform comparison among the pulsive signal component C, and a signal dividing the peak hold signal d into about 1/2 to obtain the pulse signal f having the pulse width at the voltage level a half the signal component d, and this signal is converted into digital signal.
COPYRIGHT: (C)1980,JPO&Japio
JP13626778A 1978-11-07 1978-11-07 Optical reader Pending JPS5563478A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13626778A JPS5563478A (en) 1978-11-07 1978-11-07 Optical reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13626778A JPS5563478A (en) 1978-11-07 1978-11-07 Optical reader

Publications (1)

Publication Number Publication Date
JPS5563478A true JPS5563478A (en) 1980-05-13

Family

ID=15171185

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13626778A Pending JPS5563478A (en) 1978-11-07 1978-11-07 Optical reader

Country Status (1)

Country Link
JP (1) JPS5563478A (en)

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