US2002937A - Television system - Google Patents

Television system Download PDF

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Publication number
US2002937A
US2002937A US624437A US62443732A US2002937A US 2002937 A US2002937 A US 2002937A US 624437 A US624437 A US 624437A US 62443732 A US62443732 A US 62443732A US 2002937 A US2002937 A US 2002937A
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US
United States
Prior art keywords
light
picture
television
grid
elements
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
US624437A
Other languages
English (en)
Inventor
Dowsett Harry Melville
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.)
RCA Corp
Original Assignee
RCA 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 RCA Corp filed Critical RCA Corp
Application granted granted Critical
Publication of US2002937A publication Critical patent/US2002937A/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
    • 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
    • H04N3/12—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by switched stationary formation of lamps, photocells or light relays

Definitions

  • the invention has for its object to provide'a television system wherein flicker in the received or reproduced picture shall be reduced or eliminated, wherein definition shall be improved, and wherein the general finish of the picture shall be improved.
  • the eye makes comparison with each point of thepicture with a point which has been produced before the particular point being considered.
  • means are provided for creating what may be termed a light frame orgrid or. reference so that the intensity of illumination of any point in the received picture may be appreciated by the observer not with reference to a previous point-in'the picture, but with reference to some point in the grid or frame which is provided for this purpose.
  • the grid is arranged to lie as accurately as possibleron the dividing lines between the elements. in'which the received picture is built up by a traversed point of light, i. e., in which the received picture is built up in strips, the grid will .in effect divide each strip transversely into the equivalent number of elements, the projection being such that the grid lines also lie on the lines of junction of the strips.
  • The-light grid may be produced in any convenient manner, for example, by means of a lantern slide consisting 'of a, transparent grid of the required dimensions on aopaque or black background.
  • a lantern slide consisting 'of a, transparent grid of the required dimensions on aopaque or black background.
  • I aw PAT T" asteady source may be employed'gandmay-be regulated to be about thesameintensitypmthe screen as that of thepioture byumnodulated light.
  • the light grid may-itself be moduw lated in a direction opposite to. the picture modu-.; lation instead of being of constant intensity; Any known means may 'beemployed for; this pur g p 1: 2
  • advantagez may I be obtained by providing a background garran-getment wherein four points of light around 'ach; picture element'are provided.;'-- 1
  • the invention is illustrated ;and;. furthe1- .ad scribed with reference to the acc.o ripanying; schematic drawings wherein; Figure; l;-;shows, ,in.
  • a television image is built up andpresented toa large number of people by means of.-a number of signal lamps I which are viewed through a' ground glass or similar screen 2, the audience r 1 viewing the screen in the direction of the arrow shown in Figure 2.
  • small 1 A lamps 3 are placed between the signal lamps I as shown, and these small lamps 3 are maintained at a constant light intensity corresponding to the mean of the light intensity of the picture elements as reproduced by the signal lamps I.
  • a television screen 4 composed of translucent material is provided and is viewed in the direction of the arrow shown in Figure 3.
  • the television picture elements i. e., the elements which together constitute the received viewed television picture
  • a viewing panel on which electro-optical image reproductions are to be made means forproducing over the several elemental areas of the viewing panel signal controlled point representations of thevarying values of lights and shadows of a subject of which the electro-optical image is being produced, and a plurality of light producing means surrounding each point of controlled light representation for producing independently of signalling indications constant intensity illumination over areas surrounding the areas of image point representations.
  • 'Intelevision receiving apparatus a viewingarea, means for producing on the viewing area a sequenceiof light points of varying intensities of lights and shadows controlled-in accordance with the areas of controlled intensity light representations.
  • a plurality of light sources arranged with loci corresponding to the several elemental areas into which a subject of which the electro-optical image is desired is assumed to-be divided for image transmission purposes, means for energizing the several light sources successively to causeillumination thereof alonga" series of paths substantially parallel, a plurality of independent light sources arranged adjacent-each of the first named light sources, and meansfor illuminating the last named light source's from a' local source to a constant intensity illumination.
  • a plurality of light producing elements for recompo sing'a viewed television image, a second plurality of light producing elements interposed between each of the first named light producing elements, means for receiving television signals, means for controllingthe intensity of light on successive light producing elements of the'first named plurality inaccordance with the-received signals, and means forilluminating the second plurality of light producing elements from a local source.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
US624437A 1931-07-27 1932-07-25 Television system Expired - Lifetime US2002937A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB21452/31A GB382326A (en) 1931-07-27 1931-07-27 Improvements in or relating to television systems

Publications (1)

Publication Number Publication Date
US2002937A true US2002937A (en) 1935-05-28

Family

ID=10163177

Family Applications (1)

Application Number Title Priority Date Filing Date
US624437A Expired - Lifetime US2002937A (en) 1931-07-27 1932-07-25 Television system

Country Status (3)

Country Link
US (1) US2002937A (enrdf_load_stackoverflow)
BE (1) BE390092A (enrdf_load_stackoverflow)
GB (1) GB382326A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3379831A (en) * 1964-03-19 1968-04-23 Fuji Neon Kabushiki Kaisha Flat screen television display apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3275746A (en) * 1962-12-11 1966-09-27 Beltrami Aurelio Simultaneous multiple two-way multiplex communications systems

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3379831A (en) * 1964-03-19 1968-04-23 Fuji Neon Kabushiki Kaisha Flat screen television display apparatus

Also Published As

Publication number Publication date
GB382326A (en) 1932-10-27
BE390092A (enrdf_load_stackoverflow)

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