JPS54107216A - Optical reader - Google Patents

Optical reader

Info

Publication number
JPS54107216A
JPS54107216A JP1455878A JP1455878A JPS54107216A JP S54107216 A JPS54107216 A JP S54107216A JP 1455878 A JP1455878 A JP 1455878A JP 1455878 A JP1455878 A JP 1455878A JP S54107216 A JPS54107216 A JP S54107216A
Authority
JP
Japan
Prior art keywords
circuit
bar code
level
label
light receiving
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
JP1455878A
Other languages
Japanese (ja)
Inventor
Masanori Hamada
Kiyoshi Sasaki
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP1455878A priority Critical patent/JPS54107216A/en
Publication of JPS54107216A publication Critical patent/JPS54107216A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To obtain a pulse signal corresponding to bar code by using a threshold level which has a long space part of bar code and changes the level successively even in case of level fluctuation.
CONSTITUTION: The beam from laser 1 is caused to scan on bar code label 3 by rotary mirror 2, and the reflection light of lable 3 is received by light receiving part 4 and is amplified by amplifier circuit 5 and is subjected to envelope detection by envelope detector circuit 12. Simultaneously, the laser beam is directly detected by the second light receiving part 13 through mirror 2, and level conversion circuit 14 converts signal levels successively on a basis of detection signals from light receiving part 13. Since correct signals cannot be obtained correspondingly to bar code even if the output of circufit 12 is defined as the threshold level of lable 3 at a swelled bar code scanning time, etc., the output signal of circuit 14 is added to the output signal of circuit 12 in adder circuit 15 for the purpose of obtaining a good following for the signal change of label 3. The output signal of circuit 15 is waveform-shaped as the threshold level of label 3 by wave-form shaping circuit 16.
COPYRIGHT: (C)1979,JPO&Japio
JP1455878A 1978-02-09 1978-02-09 Optical reader Pending JPS54107216A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1455878A JPS54107216A (en) 1978-02-09 1978-02-09 Optical reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1455878A JPS54107216A (en) 1978-02-09 1978-02-09 Optical reader

Publications (1)

Publication Number Publication Date
JPS54107216A true JPS54107216A (en) 1979-08-22

Family

ID=11864471

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1455878A Pending JPS54107216A (en) 1978-02-09 1978-02-09 Optical reader

Country Status (1)

Country Link
JP (1) JPS54107216A (en)

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