JPS569869A - Photoelectric type reading circuit - Google Patents

Photoelectric type reading circuit

Info

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
Application number
JP8334479A
Other languages
Japanese (ja)
Inventor
Jiro Otsuka
Hisatoshi Masagaki
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.)
Omron Corp
Original Assignee
Omron Tateisi Electronics Co
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 Omron Tateisi Electronics Co filed Critical Omron Tateisi Electronics Co
Priority to JP8334479A priority Critical patent/JPS569869A/en
Publication of JPS569869A publication Critical patent/JPS569869A/en
Pending legal-status Critical Current

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
JP8334479A 1979-06-30 1979-06-30 Photoelectric type reading circuit Pending JPS569869A (en)

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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53143901A (en) * 1977-05-23 1978-12-14 Hitachi Ltd Coil end support

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5225531A (en) * 1975-08-21 1977-02-25 Fuji Electric Co Ltd Integration type floating comparator

Patent Citations (1)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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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