US2026100A - Image transmission apparatus - Google Patents

Image transmission apparatus Download PDF

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Publication number
US2026100A
US2026100A US558162A US55816231A US2026100A US 2026100 A US2026100 A US 2026100A US 558162 A US558162 A US 558162A US 55816231 A US55816231 A US 55816231A US 2026100 A US2026100 A US 2026100A
Authority
US
United States
Prior art keywords
transmitter
picture
image
writing
receiving
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
Application number
US558162A
Other languages
English (en)
Inventor
Robeck Hermann
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.)
Siemens and Halske AG
Siemens Corp
Original Assignee
Siemens 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
Application filed by Siemens Corp filed Critical Siemens Corp
Application granted granted Critical
Publication of US2026100A publication Critical patent/US2026100A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/23—Reproducing arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
    • H04N1/36—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device for synchronising or phasing transmitter and receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising

Definitions

  • This invention relates to a process for the transmission and recording of pictures, signs or the like, in which the movable parts at the transmission and receiving end are constituted by ⁇ rotatable writing surfaces or the like driven and released entirely independently of each other, an independence of the receiving process from the starting of .the transmitting apparatus being achieved.
  • Such apparatus are locally synchronized, that is to say, at both ends means are provided such as standard tuning forks, pendulums or the like by means of which the speed of the rotating writing surfaces can be controlledand maintained either constantly the same at both ends or constantly reduced or increased by a multiple (integer number).
  • the standard tuning means are compared with each other at long intervals of time. For the reception of complete pictures it is moreover necessary to synchronize the moments at which thewriting surfaces are released. For this purpose periodically recurring current impulses have been frequently used hitherto; 'these impulses being sent out from the transmitter end and caused to act at the receiving end.
  • the stylos are preferably displaced I by an angle of 180 relatively to each other.
  • the stop is used as is well known after every revolution as the synchronizing means and is released 'from the transmitter end.
  • th ⁇ is stop can also be used in which case it is released by the said local synchronizing device.
  • An increase of the picture up to half the cir- 15 cumference of the surface of rotation is obtained by arranging at the transmitting end two pictures arranged behind each other, whilst the receiving ends are also caused to work with two writing surfaces, the screens, screen contacts 20 orthe likeof which, as well as their stylos, displaced to the duration of at least one stop, but at the outside of one revolution, release the writing surface.
  • the simplest method is to .25 choose the releasewith a time difference of half a. revolution as in this way, for instance in the case of pendulums, stops are obtained by means of contacts at both sides of their deflections without any complicated devices. It is, however, ⁇ pos- 30 sible to use only one writing surface at the receiving end by feeling or exploring-the transmitting end also with a picture which comprises halfa circumference of the writing surfaces less 1/2 stop.
  • Two stylos are then used at the receiving end 35 connected in parallel, which therefore write simultaneously and are displaced relatively to each other to the extent of one picture width.
  • Figures 1 to 3 are diagrammatic representa.- 40 tions of the start-stop system
  • FIGS 4 and 5 are diagrammatic illustrations of a transmitter and a receiver respectively constructed in accordance with thev principles of the invention.
  • Figure 6 represents a sheet bearing an image for use with the transmitter shown in Figure 4.
  • Figure 7 represents the corresponding sheet bearing the image reproduced by the receiver 50 shown in Figure 5.
  • 2a is the ⁇ time of the revolution of a rotating surface, b 55 the duration of stop, c the lead or the lag of the receiver relatively to the transmitter.
  • the systems are indicated in the lines E I and E II (of the receiver), those ot thetransmitting end in the lines S. X and Y are. the times of the 2' i+1/2b (180) and the picture in the transmitter S equal to a-1/2b that is to say, equal to the time between the end and the beginning ⁇ of the stops of E I and 'E II.
  • the displacement is equal to b, that is to say equal to onestop.
  • the transmitter S there are two identical pictures of the width a.
  • two rotating take-off or feeler contacts V Z are connected in parallel and displaced to the width of one picture, and the width of the picture in the transmitter is
  • the transmitter and receiver have been drawn diagrammatically for the case in which the writing surfaces I and la of the two apparatus are equal in size and have a circumference equal to 2a.
  • the receiver lags behind the transmitter by'c.
  • Two stylos 3 and I, displaced relatively to one another by are arranged on the circumference of the transmitter writing surface.
  • the picture reproducer of the receiver is shown at 2, while 5 and 6 are the brushes situated on the axis of the apparatus and forming the second terminals.
  • the arrows 1 show the direction of rotation.
  • the copy sheet clamped on the transmitter is therefore explored twice at the transmitter and is recorded twice at the receiver la, being recorded once as an intact picture which is displaced by an amount c relatively to the lower edge of the writing surface, while the second picture is cut by the edge 5 of the sheet.
  • a transmitter comprising means for scanning each transverse ele- 10 ment of an image to produce corresponding electrical impulses, of a recording device for receiving the impulses, and means for causing said device to record each transverse element ⁇ of the image twice in succession in adjacent relation l5 and spaced in the direction of scanning to produce duplicate images, whereby one of the two recorded images will be uninterrupted.
  • a transmitter comprising a rotating drum for supporting an image record, means for scanning each element of the image record. to produce corresponding electrical impulses
  • a recording device comprising a rotating drum for supporting an image record receiving element, and means cooperating with said record receiving element and responsive to the transmitted electrical impulses for recording each transverse element of the image twice in succession in adjacent relation and spaced in the direction of scanning to produce duplicate images, whereby one of the two recorded images will be uninterrupted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Fax Reproducing Arrangements (AREA)
  • Facsimiles In General (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Seats For Vehicles (AREA)
  • Radiography Using Non-Light Waves (AREA)
US558162A 1930-09-02 1931-08-19 Image transmission apparatus Expired - Lifetime US2026100A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1930F0034230 DE608235C (de) 1930-09-02 1930-09-02 Bilduebertragungsverfahren, bei dem die mit gleicher Geschwindigkeit laufenden Sende- und Empfangseinrichtungen voneinander unabhaengig angetrieben und ohne Ruecksicht auf ihre Phasenlage ausgeloest werden

Publications (1)

Publication Number Publication Date
US2026100A true US2026100A (en) 1935-12-31

Family

ID=34625012

Family Applications (1)

Application Number Title Priority Date Filing Date
US558162A Expired - Lifetime US2026100A (en) 1930-09-02 1931-08-19 Image transmission apparatus

Country Status (5)

Country Link
US (1) US2026100A (fr)
AT (1) AT131781B (fr)
DE (1) DE608235C (fr)
FR (1) FR721994A (fr)
GB (1) GB388763A (fr)

Also Published As

Publication number Publication date
FR721994A (fr) 1932-03-10
AT131781B (de) 1933-02-10
DE608235C (de) 1935-01-18
GB388763A (en) 1933-03-01

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