JPS54107216A - Optical reader - Google Patents
Optical readerInfo
- 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
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
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) |
-
1978
- 1978-02-09 JP JP1455878A patent/JPS54107216A/en active Pending
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