US1797378A - Television system - Google Patents

Television system Download PDF

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Publication number
US1797378A
US1797378A US379385A US37938529A US1797378A US 1797378 A US1797378 A US 1797378A US 379385 A US379385 A US 379385A US 37938529 A US37938529 A US 37938529A US 1797378 A US1797378 A US 1797378A
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US
United States
Prior art keywords
film
scanning
picture
motion picture
line
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
US379385A
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English (en)
Inventor
Theodore A Smith
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
Priority to NL31000D priority Critical patent/NL31000C/xx
Application filed by RCA Corp filed Critical RCA Corp
Priority to US379385A priority patent/US1797378A/en
Priority to FR699117D priority patent/FR699117A/fr
Priority to GB22014/30A priority patent/GB356880A/en
Application granted granted Critical
Publication of US1797378A publication Critical patent/US1797378A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H04N3/36—Scanning of motion picture films, e.g. for telecine
    • H04N3/38—Scanning of motion picture films, e.g. for telecine with continuously moving film

Definitions

  • the present invention relates to television systems, and, in particular, to television systems adapted for use in connection with the television transmission of motion picture films and the like.
  • the standard film which is provided for projection in motion picture houses is usually formed from 1 a series of distinct frames which are separated from each other by a definite frame line, and in case of television transmission of such types of subjects where the usual spiral or mirror disk 18 used, it is noticed that objectionable effects are produced at the receiver in that the frame line must always be reproduced during each step by stepmotion of the film with respect to the analyzing system, assuming, of course, that a spiral disk scanning system is used.
  • the frame line is likewise found to exist in the received icture.
  • Still other objects of my invention are to provide a scanning element for use in connection with television systems adapted to transmit motion picture films which is readily adaptable to the present known types of 1928. Serial No. 879,385.
  • Fig. 1 illustrates in a schematic manner a system utilizing the s ecialized type of scanning element which Fhave developed
  • Fig. 2 illustrates, in an enlarged detail, further embodiments of the scanning element.
  • a motion picture film 1 adapted to be wound upon a pair of reels 3, and a motor 5 provided with a shaft or spindle 7 ada ted to drive through an appropriate gear re uction system 10 a pair of sprocket wheels 9.
  • the sprocket wheels 9 are arranged to rotate in the sprocket holes 11 provided on the outside edges of the motion picture film 1, and where a constant speed or synchronous motor is provided and where the motion is pro erly synchronized so as to rotate at a uni orm rate, the motion picture film may thus be continuously fed forward at a substantially constant speed.
  • a light source 13 which may be either of the incandescent or are ty e, or any other desirable type, and arrange to project the light beams circular path, because the pitch of the spiral is very slight and is only an amount equal to the width of the frame line between successive picture frames or elements forming the entire motion picture film as is more par ticularly shown by Fig. 2 of my drawings.
  • the disk element 17 is rotating before the lens system 15 associated with the light source 13 in a counter clockwise direction, as shown. the first element of the scanning disk will trace a path 29 across the motion picture film as designated by the arrow on the film.
  • the motion picture film has been advanced during the transverse movement of the light spot produced by the light passing through the aperture or lens in the scanning disk an amount equal to the width of one line of the picture so that the second line traced on the motion film by the light source will approxi matel Y correspond in position to the first line. but, with regard to the film, will be moved upwardly thereon a predetermined amount.
  • the photo cell may be connected through an appropriate form of amplifier and arranged to have its output modulate a radio or wire transmitter. or the like, so that energy ma be transmitted to a distinct point, at which it may be received and properly amplified and arranged to actuate a glow lamp, or the like, which will produce light intensities at the receiving point corresponding and proportionate in value to the intensities of light and shadow on the transmitted motion picture film.
  • a mask 28 inserted between the lens 21 and the film 1.
  • This mask is of particular use in cases where the film 1 is accompanied by a sound record 30 placed directly thereon and the mask ma be of any appropriate rectangular size pre crably to correspond with the individual frames of the picture such that the light beam focused upon the film through the lens 21 and caused to trace a path transverse thereto will also strike such portions of the film as carry picture representations.
  • the mask instead of placing the mask between the lens 21 and the film 1. it is also fully within the scope of my invention to place the mask before the photo cell condenser lens so as to screen the cell from all portions of the film other than the individual picture frames.
  • the aperture of this mask need only be slightly higher than the width of a beam of light from a single scanning aperture but should be of such a width that the scanning spot cannot impinge upon the sound track at one side of the film nor beyond the edge of the picture frame at the other side.
  • FIG. 2. I have more particularly illus t'ratcd my scanning disk.
  • Fig. 2. I have shown several of the apertures or lenses extending about the disk wherein a designates letter glow lamp,
  • the path b indicates a path corresponding to a circular spacing and positioning of the apertures and the amount of spiral pitch which I actually impart in the 360 to the lenses or apertures is indicated by the height of the spiral which is shown by the d.
  • the width (I as diagrammatically shown is intended to indicate the width of a frame line or distance between two component frame lines 25 on the motion picture film 1.
  • a corresponding scanning disk arranged to cooperate with the light producing element so as to rebuild the transmitted picture on a screen, or the like.
  • the disk may differ from the type at the transmitter, since the transmitter obtains a relative motion between the scanning disk and the scanned object or film by virtue of the fact that the film is continuously moved with respect to the scanning element having all apertures or lenses thereof along a path which is a very slight spiral and will substantially correspond to a circular path, but since at the receiver there is no means for imparting any relative motion between the source for rebuilding the light for illumination of a screen and the screen it self, I prefer to provide the usual type of Nipkow spiral disk for cooperation with a which may be either of the plate or point discharge type so that the received picture may be built up in the usual manner in a line for line manner in which the successive lines thereof are reproduced any predetermined and suitable number of times per second, of which number, 16 to 20, or
  • a television system for transmitting motion picture film means for continuously moving the film subject to be transmitted at a uniform rate of speed, and means for analyzing the subject in such manner that the frame lines separating successive portions of the said film are omitted.
  • a system for transmitting motion picture films having successive pictures thereon separated by a frame line on the film means for moving the film subject to,be transmitted at a constant and uniform rate of speed past a predetermined point, means for analyzing the varying intensities of light and shadow on the film subject and converting the said varying intensities of light and shadow into electrical variations, and means providing for the omission of the frame lines separating the successive pictures on the film from the analyzing process.
  • means for moving the film subject to be transmitted at a constant and uniform rate of speed past a predetermined point means for scanning said film in a line for line manner along a path traverse to the path of motion thereof. and means provided on said scanning means for interrupting the sequence of sai lines of scanning to eliminate the frame lines separating the successive pictures on the film from the scanning path.
  • a scanning device having a plurality of scanning elements arranged thereon, means for continuously moving the film relative to said scanning element at a uniform rate of speed, means provided by said scanning device for analyzing the film in a line for line manner during the relative motion of said film with respect thereto, and means provided by the scanning device for analyzing only the picture portion of said film record.
  • a scanning element means provided by said scanning element for analyzing the intensity of light and shadow on said film subject, means for convertin the va ing intensities of light and she ow on t e t film subject into electrical energy variations, and means also provided by said scanning element for scanning the picture portion only of said motion picture film subject.
  • a scanning device having a plurality of scanning elements arranged thereon.
  • means for continuously moving a film subject to be transmitted relative to said scanning device at a uniform rate of speed means provided by said scanning device for analyzing the film in a line for line sequence during the relative motion of said film with respect thereto, and means also provided by the scannin device for interrupting the sequence of said lines of scanning, whereby the scanning path passes over each frame line and scans the picture portion only of said film record.
  • a scanning device means for moving a motion picture film subject at a uniform constant rate of speed relative to said scanning device, means provided by said scanning device for analyzing said film subject in a sequential line for line manner, means for converting the varying intensitics of light and shadow on the film sub ject as determined by said line for line analyzing into electrical energy variations, and means also provided by said scannin element for interrupting the sequence 0 said iines of scanning as each complete picture frame is scanned so as to pass over the frame line separating successive pictures of the film and scan the picture portion only thereof.
  • a rotary scanning element having a plurality of scanning elements arranged thereon in a spiral path having a pitch equal to the width of t e frame line separating successive pictures on motion picture film to be transmitted, means for longitudinally advancing said picture film at a constant and uniform rate relative to said scanning element, means provided by said scanning element for scanning the film in a line for line manner during the relative.m0 tion of said film with respect thereto, and means provided by the scanning element for interrupting the sequence of said lines of scanning at periods when the frame lines on said film would normally follow the scanning in line for line sequence, whereby the picture portion only of said film record is scanned.
  • a scanning device for use in the television transmission of motion picture films comprising a rotatable member having a plurality of scanning elements arranged thereon in such manner as to scan the picture portion only of the said motion picture film.
  • a scanning device having a plurality of scanning elements furcontinuously moving the film relative to said scanning device at a uniform rate of speed, means provided by said scanning device for analyzing the film in a line for line manner during the relative motion of said film with respect thereto, a photoelectric element for convertin variations in intensity of light and she ow on the scanning action into varying electrical currents, and a mask interposed between said scanning device and said photoelectric element for limiting the response of said hotoelectric element to the variations in lig t and shadow on the picture frame portion only of said film.
  • the method 0 analyzing motion pictransmission which consists in continuously and uniformly advancing the film relative to a predetermined point, and in analyzing the lm in such manner as to analyze the picture portion only thereof.
  • a scanning device for use in the television transmission of motion picture films comprising a rotatable member having a plurality of scanning elements arranged thereon in such manner as to scan the picture portion only of the said motion picture

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Radiography Using Non-Light Waves (AREA)
  • Transforming Light Signals Into Electric Signals (AREA)
  • Details Of Television Scanning (AREA)
  • Facsimiles In General (AREA)
US379385A 1929-07-19 1929-07-19 Television system Expired - Lifetime US1797378A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
NL31000D NL31000C (enrdf_load_stackoverflow) 1929-07-19
US379385A US1797378A (en) 1929-07-19 1929-07-19 Television system
FR699117D FR699117A (fr) 1929-07-19 1930-07-18 Perfectionnements aux systèmes de télévision
GB22014/30A GB356880A (en) 1929-07-19 1930-07-21 Improvements in or relating to television and like systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US379385A US1797378A (en) 1929-07-19 1929-07-19 Television system

Publications (1)

Publication Number Publication Date
US1797378A true US1797378A (en) 1931-03-24

Family

ID=23497023

Family Applications (1)

Application Number Title Priority Date Filing Date
US379385A Expired - Lifetime US1797378A (en) 1929-07-19 1929-07-19 Television system

Country Status (4)

Country Link
US (1) US1797378A (enrdf_load_stackoverflow)
FR (1) FR699117A (enrdf_load_stackoverflow)
GB (1) GB356880A (enrdf_load_stackoverflow)
NL (1) NL31000C (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
GB356880A (en) 1931-09-17
FR699117A (fr) 1931-02-10
NL31000C (enrdf_load_stackoverflow)

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