GB1420887A - Picture transmission systems - Google Patents

Picture transmission systems

Info

Publication number
GB1420887A
GB1420887A GB647774A GB647774A GB1420887A GB 1420887 A GB1420887 A GB 1420887A GB 647774 A GB647774 A GB 647774A GB 647774 A GB647774 A GB 647774A GB 1420887 A GB1420887 A GB 1420887A
Authority
GB
United Kingdom
Prior art keywords
shift register
magnetic
bubble
display
bubbles
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
GB647774A
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.)
Philips Components Ltd
Original Assignee
Mullard Ltd
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 Mullard Ltd filed Critical Mullard Ltd
Priority to GB647774A priority Critical patent/GB1420887A/en
Priority to CA219,536A priority patent/CA1055147A/en
Priority to FR7504503A priority patent/FR2260907A1/fr
Priority to AU78198/75A priority patent/AU491209B2/en
Priority to DE19752505953 priority patent/DE2505953A1/en
Publication of GB1420887A publication Critical patent/GB1420887A/en
Priority to US05/664,821 priority patent/US4123783A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/02—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes by tracing or scanning a light beam on a screen
    • G09G3/025—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes by tracing or scanning a light beam on a screen with scanning or deflecting the beams in two directions or dimensions
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/09—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on magneto-optical elements, e.g. exhibiting Faraday effect
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/001—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/30—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical otherwise than with constant velocity or otherwise than in pattern formed by unidirectional, straight, substantially horizontal or vertical lines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/002—Special television systems not provided for by H04N7/007 - H04N7/18
    • H04N7/005—Special television systems not provided for by H04N7/007 - H04N7/18 using at least one opto-electrical conversion device

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Theoretical Computer Science (AREA)
  • Multimedia (AREA)
  • Computer Hardware Design (AREA)
  • Nonlinear Science (AREA)
  • Power Engineering (AREA)
  • Optics & Photonics (AREA)
  • Compression Of Band Width Or Redundancy In Fax (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Thin Magnetic Films (AREA)

Abstract

1420887 Television; magnetic bubble systems MULLARD Ltd 13 Feb 1974 06477/74 Headings H4F and H3B The video signal derived by a television transmitter scanning in a boustrophedral pattern is reproduced at a receiver by means of a visible light source 1 illuminating a body 4 located between crossed polarizers 2, 3 and having a transparent display area supporting a magnetic bubble domain shift register channel 5 whose path corresponds to the boustrophedral scan pattern at the transmitter, an analogue-todigital converter being located at the transmitter or receiver to convert the analogue video signal into serial binary information suitable for feeding into the bubble shift register channel. A coil 6 is shown for providing a bubble supporting magnetic bias field normal to the body 4 although permanent magnetic means may be provided. The bubbles 7 in the shift register each have a direction of magnetization opposite to that of the surrounding material and so effect an opposite Faraday rotation. Body 4 may comprise the monocrystalline bismuth substituted garnet Bi 0 . 8 Sm 2 . 2 Ga 1 . 0 Fe 4 . 0 O 12 and may be cut from a crystal, polished and supported on a glass plate or it may be epitaxially grown on a transparent non-magnetic crystal substrate such as a rare-earth gallium garnet. The display may not be illuminated during operation of the shift register while the bubbles are propagated along the channel 5. The polarizer 2 and analyser 3 may be combined, a mirror being located behind the body 4. To view the display it is magnified by a lens. The A-D converter may include means for coding the serial binary information so as to enable the display to show a grey scale pattern, e.g. by modulating the spacing between the bubbles.
GB647774A 1974-02-13 1974-02-13 Picture transmission systems Expired GB1420887A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
GB647774A GB1420887A (en) 1974-02-13 1974-02-13 Picture transmission systems
CA219,536A CA1055147A (en) 1974-02-13 1975-02-06 Picture transmission systems
FR7504503A FR2260907A1 (en) 1974-02-13 1975-02-13
AU78198/75A AU491209B2 (en) 1974-02-13 1975-02-13 Improvements in and relating to picture transmission systems
DE19752505953 DE2505953A1 (en) 1974-02-13 1975-02-13 IMAGE TRANSFER SYSTEM
US05/664,821 US4123783A (en) 1974-02-13 1976-03-08 Magnetic bubble display systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB647774A GB1420887A (en) 1974-02-13 1974-02-13 Picture transmission systems

Publications (1)

Publication Number Publication Date
GB1420887A true GB1420887A (en) 1976-01-14

Family

ID=9815204

Family Applications (1)

Application Number Title Priority Date Filing Date
GB647774A Expired GB1420887A (en) 1974-02-13 1974-02-13 Picture transmission systems

Country Status (4)

Country Link
CA (1) CA1055147A (en)
DE (1) DE2505953A1 (en)
FR (1) FR2260907A1 (en)
GB (1) GB1420887A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3673521D1 (en) * 1986-05-17 1990-09-20 Itt Ind Gmbh Deutsche DIGITAL SWITCHING SYSTEM FOR (COLOR) TELEVISION RECEIVER WITH CATHODE RADIO TUBES.

Also Published As

Publication number Publication date
CA1055147A (en) 1979-05-22
AU7819875A (en) 1976-08-19
DE2505953A1 (en) 1975-08-14
FR2260907A1 (en) 1975-09-05

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Legal Events

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