GB1409124A - Optical sensing system for a record medium - Google Patents

Optical sensing system for a record medium

Info

Publication number
GB1409124A
GB1409124A GB1891373A GB1891373A GB1409124A GB 1409124 A GB1409124 A GB 1409124A GB 1891373 A GB1891373 A GB 1891373A GB 1891373 A GB1891373 A GB 1891373A GB 1409124 A GB1409124 A GB 1409124A
Authority
GB
United Kingdom
Prior art keywords
amplifier
circuit
april
diode
small 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.)
Expired
Application number
GB1891373A
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.)
NCR Voyix Corp
Original Assignee
NCR Corp
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
Priority claimed from DE19722221195 external-priority patent/DE2221195C3/en
Application filed by NCR Corp filed Critical NCR Corp
Publication of GB1409124A publication Critical patent/GB1409124A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
    • G06K7/10821—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum further details of bar or optical code scanning devices
    • G06K7/10851—Circuits for pulse shaping, amplifying, eliminating noise signals, checking the function of the sensing device

Abstract

1409124 Optical record sensors NCR CORP 19 April 1973 [29 April 1972] 18913/73 Heading G1A In a photo-electric system for scanning e.g. black lines on white paper, the photo transistor 14 is provided with a non linear (exponential) load impedance such as a diode 15, so that the circuit is usable over a large range of illumination. CONTRAST SENSITIVITY CIRCUIT:- The sensor output pulses are fed to an amplifier 13 having a load resistor 18 with two series (forward conducting) diodes 16, 17 to provide a small voltage-difference between the inputs to differential amplifiers 19, 20. Amplifier 20 charges capacitor 22 to store the brightest signal as a reference value for amplifier 19, and resistors 3, 4 determine the proportion of the small voltage drop applied to amplifier 19 and hence the brightness contrast ratio at which it switches over. Amplifier 19 controls a flip-flop circuit 24 which may be reset by a signal through resistor 9. The negative output of amplifier 19 is clamped by diode 23.
GB1891373A 1972-04-29 1973-04-19 Optical sensing system for a record medium Expired GB1409124A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722221195 DE2221195C3 (en) 1972-04-29 Photoelectric measuring and evaluation circuit for optical beams

Publications (1)

Publication Number Publication Date
GB1409124A true GB1409124A (en) 1975-10-08

Family

ID=5843684

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1891373A Expired GB1409124A (en) 1972-04-29 1973-04-19 Optical sensing system for a record medium

Country Status (4)

Country Link
JP (1) JPS4928385A (en)
CA (1) CA993104A (en)
FR (1) FR2183457A5 (en)
GB (1) GB1409124A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5624165Y2 (en) * 1976-02-28 1981-06-06
US7893829B2 (en) * 2008-06-12 2011-02-22 S.C. Johnson & Son, Inc. Device that includes a motion sensing circuit

Also Published As

Publication number Publication date
CA993104A (en) 1976-07-13
DE2221195B2 (en) 1976-03-25
JPS4928385A (en) 1974-03-13
FR2183457A5 (en) 1973-12-14
DE2221195A1 (en) 1973-11-08

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee