GB1409124A - Optical sensing system for a record medium - Google Patents
Optical sensing system for a record mediumInfo
- 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
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
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- Artificial Intelligence (AREA)
- Toxicology (AREA)
- General Health & Medical Sciences (AREA)
- Health & Medical Sciences (AREA)
- Computer Vision & Pattern Recognition (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Geophysics And Detection Of Objects (AREA)
- Image Input (AREA)
- Transforming Light Signals Into Electric Signals (AREA)
- Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
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.
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)
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 |
-
1973
- 1973-03-28 CA CA167,436A patent/CA993104A/en not_active Expired
- 1973-04-18 JP JP48043997A patent/JPS4928385A/ja active Pending
- 1973-04-19 GB GB1891373A patent/GB1409124A/en not_active Expired
- 1973-04-20 FR FR7314513A patent/FR2183457A5/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS4928385A (en) | 1974-03-13 |
DE2221195B2 (en) | 1976-03-25 |
FR2183457A5 (en) | 1973-12-14 |
CA993104A (en) | 1976-07-13 |
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 |