US2186542A - Television system - Google Patents

Television system Download PDF

Info

Publication number
US2186542A
US2186542A US158662A US15866237A US2186542A US 2186542 A US2186542 A US 2186542A US 158662 A US158662 A US 158662A US 15866237 A US15866237 A US 15866237A US 2186542 A US2186542 A US 2186542A
Authority
US
United States
Prior art keywords
cell
mosaic
scene
window
scanning
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
US158662A
Other languages
English (en)
Inventor
Gloess Paul Francois Marie
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric 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 International Standard Electric Corp filed Critical International Standard Electric Corp
Application granted granted Critical
Publication of US2186542A publication Critical patent/US2186542A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/30—Transforming light or analogous information into electric information

Definitions

  • the present invention relates to systems or apparatus for television and has as one object the elimination oi certain drawbacks Which at present exist particularly in scanning apparatus employing electronic means.
  • Thev present invention has, in particular, the
  • Fig. l shows schematically an element of an electronic scanning system
  • Fig. 2 shows schematically the electric circuit corresponding to 'an embodiment of the invenments such as l.
  • A'The circuit of the mosaic *ele-V ment considered is completed by a polarising battery B and a resistance R at the terminals of which are collected the image signals.
  • There falls on the cathode I a ray of light 3 proceeding from a point of the scene to be televised.
  • the reaction of the ray of light 3 on the cathode 2 produces, in the well-known manner, an emission of photo-electrons.
  • This emission of photoelectrons positively loads ⁇ the lcondenser C and thus produces a slowly Varying current inthe ⁇ resistance R.
  • This ce1l'5 is associated with an optical system (not shown in Fig 2) adapted to receive in a given proportion the same total luminous ilux of the scene to be televised as that receivedby l the mosaic.
  • This cell iil is then associated with'V the elements of the'mosacin the manner shown' in Fig. 2 that is to say, the cell 5v associated with ay polarising battery 6 is connected, on the one hand, over the battery 6,' to the anode.
  • the auxiliary cell 5 produces in the resistance R currents of slow varia- Iunit shown 'in Fig. 2V
  • a second objective I0 projects an image of the same scene on a Window Il Whosedimensions
  • FIG. 1 Behind this adjustable window Il is an optical condenser I2 concentrating the luminous bundle which has passed through the Window II on a photo-electric cell I3 similar to the cell 5 shown in Fig. 2.
  • the cell I3 is associated with the Various elements of the mosaicy in accordance with the manner shown in the caseY of the cell 5 on Fig. 2, The connection of the cell to the elements of the mosaic l and the resistance R has also not been shown in Fig. 3 in order not to complicate this drawing.
  • Fig. 3 shows,-by way of. example, a manual control of the opening of the window by means of an operating knob I4, this control being combined with the means for controlling of the amplitude of the sweep of the cathode ray.
  • This window or diaphragm Ii is composed of .two V- shapedelements, I5 and it. These two elements are connected 4to each other by means of pins I9, sliding in slots, such as Il and E8.
  • pins are movable along the diagonal of the'gure formed by the two branches 45 and I6, which, in the example under consideration, is in the form of a square, and may also slide in a slide, such as Z5, which permits the device to present to the objective I@ an opening which ⁇ remains square, its dimensions thus being adapted to be varied as desired.
  • the adjustment of the screen may be made in the following 'mannerz-a spring 2G presses against the element I5 thereby forcing the elem-ent i5 to assume ,a particular position byA virtue of ⁇ the construction of the device previously described.
  • the connection between the mechanical device and the manual control M is effected by means of a cable El connected to the element I6, passing over a pulley, such as 22, and
  • a drum 23 may ber mounted, for example,- directly on the axle of the adjusting knob ld and stops (not shown) may be provided in order to maintain the diaphragm at a particular opening.
  • a potentiometer 2li which permits the deflection of thev cathode scanning ray to be adjusted, for example, bythe, v
  • Fig. 3 permits the applic-ation of the invention even in the case in which the amplitude or deflection of the scanning ray is caused to vary, particularly in order to obtain scenic effects on the screen of the receiver.
  • the invention which has been described in its application to television may also be employed for similarapplioations such as, for example, in facsimile transmission systems.
  • a television transmitting system comprising an electronic scanning photo-electric ⁇ device for scanning an image of a eld of View, an auxiliary photo-electric device responsive to the average light value of said fieldv of view, an adjustable Window in front of said auxiliary device icr dening the area kof the field of View which is projected upon said auxiliary device, and means for simultaneously adjusting the aperture area of said window and the amplitude of sweep of the cathode ray of said photo-electric device rst mentioned.
  • a color ltelevision system wherein a separate transmitting arrangement according to claim l is utilized for each fundamental color to be transmitted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Transforming Electric Information Into Light Information (AREA)
US158662A 1936-09-17 1937-08-12 Television system Expired - Lifetime US2186542A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR822874T 1936-09-17

Publications (1)

Publication Number Publication Date
US2186542A true US2186542A (en) 1940-01-09

Family

ID=9281121

Family Applications (1)

Application Number Title Priority Date Filing Date
US158662A Expired - Lifetime US2186542A (en) 1936-09-17 1937-08-12 Television system

Country Status (2)

Country Link
US (1) US2186542A (fr)
FR (1) FR822874A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2531221A (en) * 1947-08-27 1950-11-21 Bell Telephone Labor Inc Delayed audible call signal for telephone substations
US2600397A (en) * 1939-11-08 1952-06-17 Fischer Ernst Friedrich Automatic regulation of light falling on deformable cathode-ray tube screen
US2730567A (en) * 1950-06-15 1956-01-10 Times Facsimile Corp Facsimile scanning method and apparatus for predetermined signal output and contrast
US2782253A (en) * 1951-03-22 1957-02-19 Pye Ltd Cameras, particularly television cameras

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2600397A (en) * 1939-11-08 1952-06-17 Fischer Ernst Friedrich Automatic regulation of light falling on deformable cathode-ray tube screen
US2531221A (en) * 1947-08-27 1950-11-21 Bell Telephone Labor Inc Delayed audible call signal for telephone substations
US2730567A (en) * 1950-06-15 1956-01-10 Times Facsimile Corp Facsimile scanning method and apparatus for predetermined signal output and contrast
US2782253A (en) * 1951-03-22 1957-02-19 Pye Ltd Cameras, particularly television cameras

Also Published As

Publication number Publication date
FR822874A (fr) 1938-01-10

Similar Documents

Publication Publication Date Title
ZwOrykin The iconoscope-A modern version of the electric eye
US2200285A (en) Television in natural color
US3112360A (en) Scanning with light-conducting rod
US2451640A (en) Control system
US2368884A (en) Television transmitting apparatus
US2747133A (en) Television pickup tube
US2929866A (en) Television pickup tube
US2186542A (en) Television system
US3026416A (en) Photoconductive devices
US2522967A (en) Video amplifier feeding constant black level output to cathoderay tube
GB446661A (en) Improvements in or relating to television transmitting systems
US2917574A (en) Color television pickup system
US3389221A (en) Television brightness compensation system
Iams et al. The image iconoscope
US3255304A (en) Alignment of television camera
US3813489A (en) Low light television camera
US2548829A (en) Color television system
US2495790A (en) Scanning system for television receivers
US2552386A (en) Color television camera
US2137278A (en) Amplifier system
US2200749A (en) Television picture reproducing apparatus
Zworykin Iconoscopes and kinescopes in television
US2465667A (en) Method of and means for controlling the beam current in television camera tubes
US2965712A (en) Automatic sensitivity control for television camera tubes
US3586763A (en) Beam splitting means for color television cameras