US1692232A - Picture-transmission system - Google Patents

Picture-transmission system Download PDF

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Publication number
US1692232A
US1692232A US74591A US7459125A US1692232A US 1692232 A US1692232 A US 1692232A US 74591 A US74591 A US 74591A US 7459125 A US7459125 A US 7459125A US 1692232 A US1692232 A US 1692232A
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US
United States
Prior art keywords
lamp
light
picture
spot
drum
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
US74591A
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English (en)
Inventor
Baker Thomas Thorne
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Individual
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Individual
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 Individual filed Critical Individual
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Publication of US1692232A publication Critical patent/US1692232A/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
    • H04N1/024—Details of scanning heads ; Means for illuminating the original
    • H04N1/032—Details of scanning heads ; Means for illuminating the original for picture information reproduction
    • H04N1/036—Details of scanning heads ; Means for illuminating the original for picture information reproduction for optical reproduction

Definitions

  • This invention relates to the telegraphic transmission of pictures, diagrams and other impressions and is concerned with apparatus for this purpose of the character comprising 8 at the transmitting station means for producing a spot of light, means enabling same to be progressively traced over a picture to be transmitted and a light-sensitive cell arranged to be affected by the rays reflected 10 from or passed through said spot and included in a circuit adapted for the emisison of signals, and at the receiving station apparatus adapted for receiving said signals and projecting light on to a sensitized sheet in accordance with the signals.
  • the object of the invention is to simplify the apparatus and enhance the speed and accuracy with which photographs, drawings and other impressed or recorded matter may be transmitted to distant receiving stations, whether by line or by radio telegraphic means.
  • apparatus of the character referred to is distinguished primarily by the receiver comprising a drum for the mounting of a sensitized sheet, a lamp under influence of the light-sepsitive cell of the transmitter, a casing containing said lamp and having an aperture through which the light from the lamp is directed on to a sensitized sheet on said drum, means to traverse said lamp casing in a fixed line parallel to the axis of said drum and means for rotatin the drum at a speed having predeter- 85 mined relation to the speed of traverse of said casing.
  • wo lamps may be arranged in the casing, one being an emergency lamp.
  • the latter may normally be masked by a shutter under relay magnet control, the relay being in circuit with the first lamp. Upon failure of the latter, the deenergizing of the relay magnet permits or brings about the immediate unmasking of the emergency lamp.
  • the selenium cell at the transmitting station is advantageously arranged to afi'ect the grid circuit of the transmitting valve or valves and the lamp current at the receiving station may be varied by suitable connection with the plate circuit of a valve in the receiv: ing set.
  • drawing Figure 1 is a diagram of a transmitter apparatus in which an ordinary photographic print wrapped round a c linder or drum reflects a spot of light whic is directed on to a photo-electric cell.
  • Figure 2 is a diagram of a receiving apparatus employing a lamp arrangement.
  • a is a drum around which a picture or ordinary photograph is wrapped
  • b is a lamp
  • c is a suitable lens or lens combination for concentratin the light on to a spot on the picture or p otograph.
  • the light and lens may be enclosed in any suitable shield or casing.
  • the light is reflected back from the picture to a suitably disposed prism d or the equivalent, adapted for directing the light on to a selenium or photo-electric cell e.
  • the cell e is advantageously connected up in the grid circuit of the transmitting valve as shown by the drawing.
  • the cell e may be made to act as a variable grid leak in connection with such valve, as by connecting its terminals with the terminals of the grid condenser.
  • the lamp 6, lens a, prism d and cell e may all be appropriately mounted upon a wheeled carriage, such as that described in my United States Patent No. 1,614,339, dated Jan. 11, 1927, this carriage being fed parallel with the axis of the drum a by means of an antifrictional screw feed.
  • a wheeled carriage such as that described in my United States Patent No. 1,614,339, dated Jan. 11, 1927, this carriage being fed parallel with the axis of the drum a by means of an antifrictional screw feed.
  • other means may be adopted for moving the spot of light progressively over the picture.
  • a sensitized sheet is supported in a manner similar to that adopted at the transmitting station and, as seen in Figure 2, a lamp 7 is arranged within a casing g adapted for directing a spot of light on to the sensitized sheet.
  • the lamp f and casing g are supported and moved in the same manner and at the same speed as the lamp Z), lens 0, prism d and cell c at the transmitting station.
  • Suitable means for synchronizing the apparatus at the two stations is required as for example, the synchronizing means described in my aforesaid patent or the pendulum synchronizers described in my concurrent U. S. patent application Ser. N 0. 74.590 of even date herewith.
  • the lamp current is varied directly or indirectly by the plate current of the valve or lastvalve of a wireless receiving set.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Apparatus Associated With Microorganisms And Enzymes (AREA)
  • Mechanical Light Control Or Optical Switches (AREA)
US74591A 1924-12-11 1925-12-10 Picture-transmission system Expired - Lifetime US1692232A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB22777/24A GB249021A (en) 1924-12-11 1924-12-11 Improvements in and connected with methods of and means for the telegraphic transmission of pictures, diagrams and other impressions

Publications (1)

Publication Number Publication Date
US1692232A true US1692232A (en) 1928-11-20

Family

ID=31898271

Family Applications (1)

Application Number Title Priority Date Filing Date
US74591A Expired - Lifetime US1692232A (en) 1924-12-11 1925-12-10 Picture-transmission system

Country Status (3)

Country Link
US (1) US1692232A (fr)
FR (1) FR609196A (fr)
GB (1) GB249021A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3790249A (en) * 1969-10-02 1974-02-05 Richards Mfg Co Illuminating means for operating microscope

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3790249A (en) * 1969-10-02 1974-02-05 Richards Mfg Co Illuminating means for operating microscope

Also Published As

Publication number Publication date
GB249021A (en) 1926-03-11
FR609196A (fr) 1926-08-10

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