JPS569869A - Photoelectric type reading circuit - Google Patents
Photoelectric type reading circuitInfo
- Publication number
- JPS569869A JPS569869A JP8334479A JP8334479A JPS569869A JP S569869 A JPS569869 A JP S569869A JP 8334479 A JP8334479 A JP 8334479A JP 8334479 A JP8334479 A JP 8334479A JP S569869 A JPS569869 A JP S569869A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- comparator
- signal
- resistances
- card
- 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 improve noise tolerance to variation in white level by forcibly applying an external constant voltage as the comparison signal of a comparing method when a recording medium such as a card is not inserted.
CONSTITUTION: Together with a voltage divided by resistances 6 and 7, constant voltage Vc is externally applied to the comparison input terminal of comparator 3 through diode 8. Then, envelope signal (b) detected through diode 4, capacitor 5 and resistances 6 and 7 from signal (a) obtained through white-level detection 1 and amplification 2 is voltage-divided by resistances 6 and 7 so as to set voltage Vc to a voltage a little bit lower than a value of voltage Vb closest to zero. When detector 1 detects a mark card, etc., comparator 3 is applied with comparison voltage Vb and comparator 3 outputs a signal of the high level when marks are found or of the low level when not. When no card is detected, comparator 3 is applied with voltage Vc to generate no output when a mixed noise arrives in detector 1 and amplifier 2 is not more than voltage Vc, so that the noise tolerance can be improved.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8334479A JPS569869A (en) | 1979-06-30 | 1979-06-30 | Photoelectric type reading circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8334479A JPS569869A (en) | 1979-06-30 | 1979-06-30 | Photoelectric type reading circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS569869A true JPS569869A (en) | 1981-01-31 |
Family
ID=13799812
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8334479A Pending JPS569869A (en) | 1979-06-30 | 1979-06-30 | Photoelectric type reading circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS569869A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53143901A (en) * | 1977-05-23 | 1978-12-14 | Hitachi Ltd | Coil end support |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5225531A (en) * | 1975-08-21 | 1977-02-25 | Fuji Electric Co Ltd | Integration type floating comparator |
-
1979
- 1979-06-30 JP JP8334479A patent/JPS569869A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5225531A (en) * | 1975-08-21 | 1977-02-25 | Fuji Electric Co Ltd | Integration type floating comparator |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53143901A (en) * | 1977-05-23 | 1978-12-14 | Hitachi Ltd | Coil end support |
JPS6137855B2 (en) * | 1977-05-23 | 1986-08-26 | Hitachi Ltd |
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