US3728521A - Encoded card employing fiber optic elements - Google Patents
Encoded card employing fiber optic elements Download PDFInfo
- Publication number
- US3728521A US3728521A US00076523A US3728521DA US3728521A US 3728521 A US3728521 A US 3728521A US 00076523 A US00076523 A US 00076523A US 3728521D A US3728521D A US 3728521DA US 3728521 A US3728521 A US 3728521A
- Authority
- US
- United States
- Prior art keywords
- light
- fibers
- transmitting
- card
- encoded
- 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 - Lifetime
Links
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/43—Arrangements comprising a plurality of opto-electronic elements and associated optical interconnections
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/08—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means
- G06K19/083—Constructional details
- G06K19/086—Constructional details with markings consisting of randomly placed or oriented elements, the randomness of the elements being useable for generating a unique identifying signature of the record carrier, e.g. randomly placed magnetic fibers or magnetic particles in the body of a credit card
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/08—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means
- G06K19/10—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means at least one kind of marking being used for authentication, e.g. of credit or identity cards
- G06K19/14—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means at least one kind of marking being used for authentication, e.g. of credit or identity cards the marking being sensed by radiation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S70/00—Locks
- Y10S70/51—Light sensitive control means
Definitions
- FIG. 2 is a view similar to FIG. 1, showing a card in which the light-transmitting ability of certain fibers has been impaired or modified in several alternate ways;
- the card may be manufactured by any suitable laminating process. This is not part of the present invention so will not be described in detail. Briefly, and referring to FIG. A,. asheet 44 having light-transmitting fibers 30 in a body or matrix 46. may be laminated by conventional hot pressure or adhesive techniques between cover sheets 48 and 50. The cover sheets and the matrix 46 may be of the same plastics v mitting fibers 30. This is merely by way of illustration and not by way of limitation because in actual practice each card may have from 10 to 600 fibers, each comprising a separately readable information channel.
- the card is encoded by individually I I cutting, darkening, partially removing, or otherwise impairing the light-transmitting ability of selected fibers.
- FIG. 1 52 indicates a fiber which is continuous and capable of transmitting light from one edge of the card to the other; 54 is a fiber which is discontinuous in the area 56 and therefore incapable of transmitting full intensity light.
- This area 56, as well as area 42 in FIG. 7, may be filled with opaque material if desired to completely block light transmission for maximum contrast.
- FIG. A shows a modified card 81 in which fibers 83 extend in non-parallel, random arrangement between the input edge 85 and the output edge 87.
- the light source and reader could be reprogrammed several times during the month, daily if necessary, to verify bona fide cards and reject expired and counterfeit cards.
- the light source 74 could be programmed by illuminating only the first, third, seventh and llth lamps, at the same time, the reader 76 could be programmed to verify the card only if it senses the third, fourth, ninth and l5th lighted fiber ends while all other positions are unlighted.
- the light source and reader could be reprogrammed, if necessary, to verify other combinations of fibers in the same card.
- FIGS. 3 and 10 One way of storing information is shown in FIGS. 3 and 10, in which the various combinations of lighted and unlighted fiber ends correspond to data in a memory bank. Each combination read from card 68 or 72 may correspond to a differentnumber, name, or other information. The number of possible usable combinations of lighted and unlighted fibers is determined by the following formula:
- said core sheet having a layer of a plurality of elongated light-transmitting fibers disposed in side-byside planar relationship at least at the light receiving and emitting edge of the card and extending between said light-receiving and light-emitting edge surfaces and having their opposite ends exposed at said light-receiving and light-emitting edges for transmitting light from an external light source means edgewise through said body to an external light sensing means;
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Optics & Photonics (AREA)
- Credit Cards Or The Like (AREA)
- Optical Transform (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US7652370A | 1970-09-29 | 1970-09-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3728521A true US3728521A (en) | 1973-04-17 |
Family
ID=22132554
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00076523A Expired - Lifetime US3728521A (en) | 1970-09-29 | 1970-09-29 | Encoded card employing fiber optic elements |
Country Status (8)
Country | Link |
---|---|
US (1) | US3728521A (enrdf_load_stackoverflow) |
JP (1) | JPS522318B1 (enrdf_load_stackoverflow) |
CA (1) | CA940899A (enrdf_load_stackoverflow) |
CH (1) | CH552252A (enrdf_load_stackoverflow) |
DE (1) | DE2148540A1 (enrdf_load_stackoverflow) |
FR (1) | FR2112989A5 (enrdf_load_stackoverflow) |
GB (1) | GB1319210A (enrdf_load_stackoverflow) |
IT (1) | IT957102B (enrdf_load_stackoverflow) |
Cited By (33)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3858031A (en) * | 1973-02-16 | 1974-12-31 | Bliss & Laughlin Ind | Credit card having clear middle layer encoded by discrete opaque areas and system for decoding same by laser beam |
US3977762A (en) * | 1974-09-05 | 1976-08-31 | International Standard Electric Corporation | Optical coupler |
US3996455A (en) * | 1974-05-08 | 1976-12-07 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Two-dimensional radiant energy array computers and computing devices |
US4021664A (en) * | 1973-12-28 | 1977-05-03 | Eastman Kodak Company | Storage and retrieval of graphic information |
US4053764A (en) * | 1975-10-02 | 1977-10-11 | The United States Of America As Represented By The Secretary Of The Air Force | Higher-order mode fiber optics t-coupler |
US4070093A (en) * | 1976-08-26 | 1978-01-24 | Bell Telephone Laboratories, Incorporated | Minimizing transmission path disabling due to defective transmission members of a communications cable |
US4117460A (en) * | 1976-11-01 | 1978-09-26 | United Technologies Corporation | Sensing device |
US4138057A (en) * | 1977-07-08 | 1979-02-06 | Atalla Technovations | Card, system and method for securing user identification data |
US4362930A (en) * | 1980-01-10 | 1982-12-07 | Zeag Systems A.G. | Data carrier card |
US4418278A (en) * | 1981-05-20 | 1983-11-29 | Mondshein Lee F | Embedded optic fiber page |
FR2583794A1 (fr) * | 1985-06-24 | 1986-12-26 | Arjomari Prioux | Document de securite utilisant des fibres optiques, procede de fabrication et procede d'authentification. |
US4671839A (en) * | 1985-12-23 | 1987-06-09 | Xerox Corporation | Secure identification card manufacture |
US4756557A (en) * | 1984-12-21 | 1988-07-12 | G.A.O. Gesellschaft Fuer Automation Und Organisation Mbh | Security document having a security thread embedded therein and methods for producing and testing the authenticity of the security document |
US4906837A (en) * | 1988-09-26 | 1990-03-06 | The Boeing Company | Multi-channel waveguide optical sensor |
US5218594A (en) * | 1990-03-08 | 1993-06-08 | Pioneer Electric Corporation | Recording medium with an optical waveguide and player for playing the same |
FR2698971A1 (fr) * | 1992-12-03 | 1994-06-10 | Arufog | Dispositif de reconnaissance de sécurité. |
US5321780A (en) * | 1992-03-03 | 1994-06-14 | Seymour Edelman | Optical digital memory system |
US5392369A (en) * | 1992-03-03 | 1995-02-21 | Edelman; Seymour | Optical digital memory system |
US5633975A (en) * | 1995-11-14 | 1997-05-27 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Security system responsive to optical fiber having Bragg grating |
US5959289A (en) * | 1996-02-13 | 1999-09-28 | Empire Airport Service Co., Ltd. | Card and information recording card and method of using the same |
US6005991A (en) * | 1997-11-26 | 1999-12-21 | Us Conec Ltd | Printed circuit board assembly having a flexible optical circuit and associated fabrication method |
US6193156B1 (en) * | 1998-11-12 | 2001-02-27 | Wenyu Han | Method and apparatus for patterning cards, instruments and documents |
EP0902392A3 (de) * | 1997-09-10 | 2001-09-26 | Robert Bosch Gmbh | Chipkarte |
US20030038239A1 (en) * | 1999-12-30 | 2003-02-27 | Joshua Nemeth | Method of determining a characteristic of a security document, such as a banknote |
US6566672B1 (en) * | 2000-09-29 | 2003-05-20 | Heidelberger Druckmaschinen Ag | Light sensor for sheet products |
WO2003060845A1 (en) * | 2002-01-08 | 2003-07-24 | Igt | Illuminated player tracking card for a gaming apparatus |
US20050271316A1 (en) * | 2004-06-08 | 2005-12-08 | Weaver Thomas L | Method of identifying and labeling optical conduits |
US7104449B2 (en) * | 1998-11-12 | 2006-09-12 | Wenyu Han | Method and apparatus for patterning cards, instruments and documents |
US20070263967A1 (en) * | 2003-09-04 | 2007-11-15 | Abhinand Lath | Light Pipe Containing Material |
US20070270203A1 (en) * | 2006-05-16 | 2007-11-22 | Konami Gaming, Incorporated | Gaming machine and gaming system |
US20090310347A1 (en) * | 2003-09-04 | 2009-12-17 | Sensitile Systems | Light system with stacked light pipe structure |
US20240184045A1 (en) * | 2022-12-06 | 2024-06-06 | Globalfoundries U.S. Inc. | Identification system |
US12254364B1 (en) * | 2009-10-08 | 2025-03-18 | Dynamics Inc. | Programming with light for powered cards and devices |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5393421A (en) * | 1977-01-27 | 1978-08-16 | Toyoda Gosei Kk | Connected hose member |
JPS5566285U (enrdf_load_stackoverflow) * | 1978-10-30 | 1980-05-07 | ||
JPS5858184U (ja) * | 1981-10-15 | 1983-04-20 | 川崎製鉄株式会社 | フレキシブルホ−ス用防塵防水装置 |
GB2148486B (en) * | 1983-09-13 | 1986-12-17 | Bradbury Wilkinson Plc | Identification of articles |
GB8400746D0 (en) * | 1984-01-12 | 1984-02-15 | Bradbury Wilkinson Cheques Ltd | Security document |
CH683876A5 (de) * | 1988-09-30 | 1994-05-31 | Landis & Gyr Business Support | In zwei Richtungen auslesbares Strichkodefeld. |
RU2136048C1 (ru) * | 1994-01-05 | 1999-08-27 | Юрий Иванович Горбань | Знак подлинности |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2177077A (en) * | 1935-11-04 | 1939-10-24 | Teletype Corp | Photoelectric transmitter |
US2939016A (en) * | 1956-11-20 | 1960-05-31 | Ibm | Detecting apparatus |
US3101411A (en) * | 1960-05-17 | 1963-08-20 | American Optical Corp | Light conducting device to transmit ultra-violet radiation for specimen fluorescenceunder a microscope |
US3125812A (en) * | 1961-03-03 | 1964-03-24 | Apparatus for decoding an encoded light image | |
US3163758A (en) * | 1961-03-13 | 1964-12-29 | Gen Electric | Automatic character reader utilizing infrared radiation |
US3241986A (en) * | 1962-02-28 | 1966-03-22 | Servo Corp Of America | Optical infrared-transmitting glass compositions |
US3335265A (en) * | 1963-09-11 | 1967-08-08 | Solar Systems Inc | Punched card reader |
US3470359A (en) * | 1966-04-05 | 1969-09-30 | Fmc Corp | Anti-counterfeit document |
-
1970
- 1970-09-29 US US00076523A patent/US3728521A/en not_active Expired - Lifetime
-
1971
- 1971-06-15 CA CA115,697A patent/CA940899A/en not_active Expired
- 1971-08-11 JP JP46060940A patent/JPS522318B1/ja active Pending
- 1971-09-24 GB GB4464471A patent/GB1319210A/en not_active Expired
- 1971-09-25 DE DE19712148540 patent/DE2148540A1/de active Pending
- 1971-09-27 IT IT53111/71A patent/IT957102B/it active
- 1971-09-28 FR FR7134866A patent/FR2112989A5/fr not_active Expired
- 1971-09-28 CH CH1409071A patent/CH552252A/xx not_active IP Right Cessation
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2177077A (en) * | 1935-11-04 | 1939-10-24 | Teletype Corp | Photoelectric transmitter |
US2939016A (en) * | 1956-11-20 | 1960-05-31 | Ibm | Detecting apparatus |
US3101411A (en) * | 1960-05-17 | 1963-08-20 | American Optical Corp | Light conducting device to transmit ultra-violet radiation for specimen fluorescenceunder a microscope |
US3125812A (en) * | 1961-03-03 | 1964-03-24 | Apparatus for decoding an encoded light image | |
US3163758A (en) * | 1961-03-13 | 1964-12-29 | Gen Electric | Automatic character reader utilizing infrared radiation |
US3241986A (en) * | 1962-02-28 | 1966-03-22 | Servo Corp Of America | Optical infrared-transmitting glass compositions |
US3335265A (en) * | 1963-09-11 | 1967-08-08 | Solar Systems Inc | Punched card reader |
US3470359A (en) * | 1966-04-05 | 1969-09-30 | Fmc Corp | Anti-counterfeit document |
Cited By (43)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3858031A (en) * | 1973-02-16 | 1974-12-31 | Bliss & Laughlin Ind | Credit card having clear middle layer encoded by discrete opaque areas and system for decoding same by laser beam |
US4021664A (en) * | 1973-12-28 | 1977-05-03 | Eastman Kodak Company | Storage and retrieval of graphic information |
US3996455A (en) * | 1974-05-08 | 1976-12-07 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Two-dimensional radiant energy array computers and computing devices |
US3977762A (en) * | 1974-09-05 | 1976-08-31 | International Standard Electric Corporation | Optical coupler |
US4053764A (en) * | 1975-10-02 | 1977-10-11 | The United States Of America As Represented By The Secretary Of The Air Force | Higher-order mode fiber optics t-coupler |
US4070093A (en) * | 1976-08-26 | 1978-01-24 | Bell Telephone Laboratories, Incorporated | Minimizing transmission path disabling due to defective transmission members of a communications cable |
US4117460A (en) * | 1976-11-01 | 1978-09-26 | United Technologies Corporation | Sensing device |
US4138057A (en) * | 1977-07-08 | 1979-02-06 | Atalla Technovations | Card, system and method for securing user identification data |
US4138058A (en) * | 1977-07-08 | 1979-02-06 | Atalla Technovations | Card, system and method for securing personal identification data |
US4362930A (en) * | 1980-01-10 | 1982-12-07 | Zeag Systems A.G. | Data carrier card |
US4418278A (en) * | 1981-05-20 | 1983-11-29 | Mondshein Lee F | Embedded optic fiber page |
US4756557A (en) * | 1984-12-21 | 1988-07-12 | G.A.O. Gesellschaft Fuer Automation Und Organisation Mbh | Security document having a security thread embedded therein and methods for producing and testing the authenticity of the security document |
FR2583794A1 (fr) * | 1985-06-24 | 1986-12-26 | Arjomari Prioux | Document de securite utilisant des fibres optiques, procede de fabrication et procede d'authentification. |
EP0208573A1 (fr) * | 1985-06-24 | 1987-01-14 | ARJOMARI-PRIOUX Société anonyme dite | Document de sécurité utilisant des fibres optiques et procédé d'authentification |
US4671839A (en) * | 1985-12-23 | 1987-06-09 | Xerox Corporation | Secure identification card manufacture |
US4906837A (en) * | 1988-09-26 | 1990-03-06 | The Boeing Company | Multi-channel waveguide optical sensor |
US5218594A (en) * | 1990-03-08 | 1993-06-08 | Pioneer Electric Corporation | Recording medium with an optical waveguide and player for playing the same |
US5321780A (en) * | 1992-03-03 | 1994-06-14 | Seymour Edelman | Optical digital memory system |
US5392369A (en) * | 1992-03-03 | 1995-02-21 | Edelman; Seymour | Optical digital memory system |
FR2698971A1 (fr) * | 1992-12-03 | 1994-06-10 | Arufog | Dispositif de reconnaissance de sécurité. |
US5633975A (en) * | 1995-11-14 | 1997-05-27 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Security system responsive to optical fiber having Bragg grating |
US5959289A (en) * | 1996-02-13 | 1999-09-28 | Empire Airport Service Co., Ltd. | Card and information recording card and method of using the same |
EP0790576A3 (en) * | 1996-02-13 | 2000-11-22 | Empire Airport Service Co., Ltd. | Information card |
EP0902392A3 (de) * | 1997-09-10 | 2001-09-26 | Robert Bosch Gmbh | Chipkarte |
US6005991A (en) * | 1997-11-26 | 1999-12-21 | Us Conec Ltd | Printed circuit board assembly having a flexible optical circuit and associated fabrication method |
US6193156B1 (en) * | 1998-11-12 | 2001-02-27 | Wenyu Han | Method and apparatus for patterning cards, instruments and documents |
US7104449B2 (en) * | 1998-11-12 | 2006-09-12 | Wenyu Han | Method and apparatus for patterning cards, instruments and documents |
US20030038239A1 (en) * | 1999-12-30 | 2003-02-27 | Joshua Nemeth | Method of determining a characteristic of a security document, such as a banknote |
EP1242980A4 (en) * | 1999-12-30 | 2004-08-11 | Note Printing Au Ltd | METHOD FOR DETERMINING THE CHARACTERISTICS OF A SECURITY DOCUMENT, SUCH AS A BANK TICKET |
US6835934B2 (en) | 1999-12-30 | 2004-12-28 | Note Printing Australia Limited | Method of determining a characteristic of a security document, such as a banknote |
US6566672B1 (en) * | 2000-09-29 | 2003-05-20 | Heidelberger Druckmaschinen Ag | Light sensor for sheet products |
US6890260B2 (en) | 2002-01-08 | 2005-05-10 | Igt | Illuminated player tracking card for a gaming apparatus |
WO2003060845A1 (en) * | 2002-01-08 | 2003-07-24 | Igt | Illuminated player tracking card for a gaming apparatus |
US20070263967A1 (en) * | 2003-09-04 | 2007-11-15 | Abhinand Lath | Light Pipe Containing Material |
US7520651B2 (en) * | 2003-09-04 | 2009-04-21 | Abhinand Lath | Light pipe containing material |
US20090310347A1 (en) * | 2003-09-04 | 2009-12-17 | Sensitile Systems | Light system with stacked light pipe structure |
US7988324B2 (en) | 2003-09-04 | 2011-08-02 | Sensitile Systems | Light system with stacked light pipe structure |
US20050271316A1 (en) * | 2004-06-08 | 2005-12-08 | Weaver Thomas L | Method of identifying and labeling optical conduits |
US7315664B2 (en) * | 2004-06-08 | 2008-01-01 | The Boeing Company | Method of identifying and labeling optical conduits |
US20070270203A1 (en) * | 2006-05-16 | 2007-11-22 | Konami Gaming, Incorporated | Gaming machine and gaming system |
US12254364B1 (en) * | 2009-10-08 | 2025-03-18 | Dynamics Inc. | Programming with light for powered cards and devices |
US20240184045A1 (en) * | 2022-12-06 | 2024-06-06 | Globalfoundries U.S. Inc. | Identification system |
US12332480B2 (en) * | 2022-12-06 | 2025-06-17 | Globalfoundries U.S. Inc. | Identification system |
Also Published As
Publication number | Publication date |
---|---|
JPS522318B1 (enrdf_load_stackoverflow) | 1977-01-20 |
IT957102B (it) | 1973-10-10 |
CA940899A (en) | 1974-01-29 |
DE2148540A1 (de) | 1972-04-20 |
GB1319210A (en) | 1973-06-06 |
FR2112989A5 (enrdf_load_stackoverflow) | 1972-06-23 |
CH552252A (de) | 1974-07-31 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3728521A (en) | Encoded card employing fiber optic elements | |
US4538059A (en) | Identification card with concealed coding and a simple reader module to decode it | |
US4914700A (en) | Method and apparatus for scrambling and unscrambling bar code symbols | |
US4544836A (en) | Optically-based access control system | |
US4034211A (en) | System and method for providing a security check on a credit card | |
US5932870A (en) | Documents containing a magnetic strip with a bar code affixed thereto | |
US3566083A (en) | Sensor for punches and marks | |
US4143810A (en) | Documents coded by means of machine-readable optical markings | |
US3737629A (en) | Optical code reader | |
EP0866420A2 (en) | Identification card or badge | |
TW469410B (en) | Reading arrangement for information strips with optically encoded information | |
GB2108906A (en) | Identification card with concealed coding and decoding module | |
US3453419A (en) | Code reading system | |
US3512130A (en) | Binary perforation coded credit card and system | |
US3858031A (en) | Credit card having clear middle layer encoded by discrete opaque areas and system for decoding same by laser beam | |
US3611292A (en) | Credit card validation system | |
US3688088A (en) | Credit card validation system using an opaque card having translucent coded areas | |
US3567909A (en) | Information handling system | |
US3821518A (en) | Position authentication system for information bearing devices | |
US3629835A (en) | Credit card validation system using an optical reader employing reflected light | |
EP0635841A2 (en) | Opto-electronic memory systems | |
GB1481902A (en) | Checking apparatus for documents | |
US3596249A (en) | Credit card reader for sensing density of resilient material | |
US3628016A (en) | Photoelectric reader for fluorescent ink imprinted coded document | |
US3694285A (en) | Method for making encoded cards |