US2199272A - Television transmitter - Google Patents

Television transmitter Download PDF

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Publication number
US2199272A
US2199272A US60295A US6029536A US2199272A US 2199272 A US2199272 A US 2199272A US 60295 A US60295 A US 60295A US 6029536 A US6029536 A US 6029536A US 2199272 A US2199272 A US 2199272A
Authority
US
United States
Prior art keywords
film
disc
image
scanning
reproduction
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
US60295A
Other languages
English (en)
Inventor
Schlesinger Kurt
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.)
LOEWE RADIO Inc
Original Assignee
LOEWE RADIO Inc
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 LOEWE RADIO Inc filed Critical LOEWE RADIO Inc
Application granted granted Critical
Publication of US2199272A publication Critical patent/US2199272A/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
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/06—Generation of synchronising signals
    • H04N5/067—Arrangements or circuits at the transmitter end
    • H04N5/073—Arrangements or circuits at the transmitter end for mutually locking plural sources of synchronising signals, e.g. studios or relay stations
    • 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
    • H04N3/02—Scanning details of television systems; Combination thereof with generation of supply voltages by optical-mechanical means only
    • H04N3/04—Scanning details of television systems; Combination thereof with generation of supply voltages by optical-mechanical means only having a moving aperture also apertures covered by lenses
    • 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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/06—Generation of synchronising signals

Definitions

  • Figs. 2 and. 3 there are illustrated details of the transmitter mechanism with the novel features of my invention, Fig. 3 being a section of Fig. 2 along the line 3-3.
  • Fig. 1 there is shown the operation of the two-fold scanning of a film, which is moved evenly from the bot- 15 tom towards the top.
  • a scanning period is divided into six single positions I-6.
  • the double-spiral disc 8 is shown in the correct operative position in relation to the movement of the film ll.
  • Its sectional area is designated 9.
  • the scanning image points are entered over the movement of the film. They are connected with each other in broken lines by a curve II].
  • This curve represents a relaxation oscillation interrupted at the points 6--l or I.
  • the height of this relaxation oscillation is equal to the height of the sectional area 9 and 30 is designated h.
  • M etn'c-The scale of reproduction must be such that the height of the reproduction exceeds the sectional area on the disc by the width of two image points.
  • Trapezium The optical reproduction of the film area on the disc must be accompanied by a trapezoidal distortion, in which the angle between the inclined sides of the trapezium is exactly equal to the angle between two successive radii of the Nipkow disc.
  • the transmitter illustrated in Fig. 2 not only permits of the accomplishment of these five conditions, which in their entirety :guarantee the transmission, without error, of the contents of the image according to the interlaced scanning. method.
  • Figsc2 and 3 show inside view and cross sectiona transmission device which permits of the adjustment of all of these conditions.
  • the film in the manner known per se, is conducted from asupply reel ll over a-conveying roller l2 and then enters the .track I 3. With this film track there is firmly connecteda feed roller l4, so that the film always runs smoothly on to the slides l3.
  • a take-up roller [5, which is also firmly connected with [3, takes up the film smoothly and conducts it to a secondconveying roller l5 firmly connected with the casing. Following thereon the film may be conducted throughthe sound deviceto the second supply reel.
  • the gate 13 is mounted on a pivot H, which in turn belongs to a sliding member I8.
  • This member I8 is capable of being displaced in elongated apertures l8 exactly in the direction of the reproducing ray of light.
  • the displacement is finely adjustable by means of screws'and spindles (not shown).
  • the Nipkow disc 8 and the shutter diaphragm 20 are driven by synchronising motors 8' and 20 respectively. By increasing the spacing between film and disc to project a gradually decreasing reproduction on 8, which may always be adjusted to be sharp by readjustment of the shiftable lens l9.
  • To fulfil the second parallax condition there is employed a vertical spindle 2
  • moves upwards and downwards a diaphragm 22 close the plane of the film [3.
  • the lighted image section has been correctly adapted in size and position to the sectional area of the disc its trapezoidal form must be adapted to'that of the-disc 8.
  • the journal H the centre-point of which lays exactly in the plane of the film [3.
  • the entire film track 13 may accordingly be turned about thisjournal I! and finally the correct inclination once and for all fixed by the screw 23.
  • the entire optical passage. of the rays must be capable of being adjustably tilted in relation to the horizontal.
  • the fourth condition, image phase, is fulfilled by the interposition of an excentrically mounted roller 24.
  • the image mark is able to be made co-phasal with the jumping-over point on the Nipkow disc 8 by adjusting the BXCBID vtricity of 24.
  • an arrangement for exactly adjusting the position of the film gate relatively to the scanning means comprising a member which is horizontally shiftable-foradjusting the distance of the film gate from the scanning means, a film gate adjustably pivoted on said member for varying the inclination of the film gate relatively to the lens system, and a diaphragm shift'able on the film gate in a directionparallel to said film gate for adjusting the effective borders of the film gate.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Transforming Light Signals Into Electric Signals (AREA)
  • Details Of Television Scanning (AREA)
  • Facsimiles In General (AREA)
US60295A 1934-09-04 1936-01-22 Television transmitter Expired - Lifetime US2199272A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE465184X 1934-09-04

Publications (1)

Publication Number Publication Date
US2199272A true US2199272A (en) 1940-04-30

Family

ID=6540357

Family Applications (1)

Application Number Title Priority Date Filing Date
US60295A Expired - Lifetime US2199272A (en) 1934-09-04 1936-01-22 Television transmitter

Country Status (3)

Country Link
US (1) US2199272A (fr)
FR (3) FR47202E (fr)
GB (3) GB465184A (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB475032A (en) * 1936-04-09 1937-11-09 George Edward Condliffe Improvements relating to television systems
DE743589C (de) * 1937-01-18 1943-12-29 Fernseh Gmbh Anordnung zur mehrmaligen Abtastung der Bilder eines gleichfoermig bewegten Films
US2967907A (en) * 1952-06-02 1961-01-10 Hogan Faximile Corp Continuous facsimile scanning apparatus

Also Published As

Publication number Publication date
FR47202E (fr) 1937-02-20
GB472160A (en) 1937-09-17
FR46698E (fr) 1936-07-24
FR794028A (fr) 1936-02-06
GB465184A (en) 1937-05-03
GB465185A (en) 1937-04-30

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