US3628076A - Photoconductive screen deriving light thorugh light conductor from tube filament - Google Patents

Photoconductive screen deriving light thorugh light conductor from tube filament Download PDF

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Publication number
US3628076A
US3628076A US885914A US3628076DA US3628076A US 3628076 A US3628076 A US 3628076A US 885914 A US885914 A US 885914A US 3628076D A US3628076D A US 3628076DA US 3628076 A US3628076 A US 3628076A
Authority
US
United States
Prior art keywords
light
screen
electron beam
conductor
filament
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
US885914A
Other languages
English (en)
Inventor
Willem Paul Weijland
Hans Georg Gerlach
Antonius Joannes Maria Va Beld
Louis Maarten Swart
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.)
US Philips Corp
Original Assignee
US Philips 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 claimed from NL6818583A external-priority patent/NL160429C/xx
Application filed by US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3628076A publication Critical patent/US3628076A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/89—Optical or photographic arrangements structurally combined or co-operating with the vessel
    • H01J29/892—Optical or photographic arrangements structurally combined or co-operating with the vessel using fibre optics
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/89—Optical or photographic arrangements structurally combined or co-operating with the vessel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/26—Image pick-up tubes having an input of visible light and electric output
    • H01J31/28—Image pick-up tubes having an input of visible light and electric output with electron ray scanning the image screen
    • H01J31/34—Image pick-up tubes having an input of visible light and electric output with electron ray scanning the image screen having regulation of screen potential at cathode potential, e.g. orthicon
    • H01J31/38—Tubes with photoconductive screen, e.g. vidicon
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/89—Optical components associated with the vessel
    • H01J2229/8926—Active components, e.g. LCD's, indicators, illuminators and moving devices

Definitions

  • Trifan ABSTRACT A television camera tube of the Vidicon type in which a photoconductive screen at one end of an evacuated envelope receives an image of a scene to be televised and is [5 1 1 PHO'IO'CONDUCTIVE SCREEN DERIVING LIGHT THROUGH LIGHT CONDUCTOR FROM TUBE FILAMENT 4 cmml's Drawing Figs; scanned by en electron beam An auxihury light source 15 provlded for uniformly illuminating the screen and a light conduc- [52] U.S.C
  • the invention relates to a camera tube of the vidicon type comprising a photoconductive screen, the invention relates in particular to a Pluiiibicon.
  • the tube according to the invention comprises one or more light-conductive members which conduct light from an auxiliary light source in the direction of the photoconductive screen.
  • the auxiliary light source may be the filament of the cathode of the tube itself but a larger control range of the dark current can be obtained by the light of a separate light source, if desirable in combination with color filters.
  • the light conductor may consist of a glass rod which is suitably bent so that the light of a light source situated in front of one end of the rod emanates at the other end from the rod. lf desirable the light-conductor may be formed entirely or partly bythe wall of the envelope of the tube itself.
  • F I68. I, 2, Band 4 are diagrammatic longitudinal cross-secthe light guided to the screen 9 can be obtained within certain limits by varying the filament current 7. However, one is restricted to the minimum operating temperature of the cathode, while the maximum adjustable temperature may not reduce the lifetime too strongly. The limits within which the background light can be controlled therefore are comparatively narrow.
  • the light conductor in bent at one end in such manner that said end can be passed out through the aperture of the exhaust tube in the bottom of the tube, and be sealed in the tip of the exhaust tube.
  • the tip of the exhaust tube is surrounded by a sheath 13 in which a light source 14 is situated.
  • the sheath 13 may be housed in the holder 5 of the tube.
  • HO. 5 is across-section view of a light conductor.
  • Reference numeral 1 in the drawings denotes the cylindrical glass wall of a television camera tube which is closed at one end by a glass window portion 2 and at the other end by a botminosity of a picture projected on the screen 9 through the window 2, it is desirable to provide a low uniform background illumination of the screen 9.
  • arogll shagedr light condugtor 10 which is bent at one end in such manner msra' an of firefi h irradiated by the filament 7 is guided through the light conductor 10 to the collector space 11 inside the last electrode 12 of the electron lens of the tube and emerges there from the light-conductor.
  • the cathode is optically open at its lower side, so as to permit the filament light to emanate.
  • 'Ihe light-conductor 10 can be supported by electrodes of the tube bymeans of clamping members 18, 19.
  • the electrode 12 comprises an inner wall which is proccssed so that the light is reflected in a diffuse manner and is unifonnly distributed over the photoconductive screen 9.
  • a color filter can be arranged between the light source 14 and the photoconductive screen.
  • the color filter can be provided between the light source and the end of the light conductor, or near the end of the light conductor.
  • the light conductor itself may consist of colored material. if the end of a rod-shaped light conductor ends opposite to the sidewall of the tube, the sidewall of the envelope may be manufactured from colored glass or a color filter may be provided on the wall. Naturally, the color filter may also be provided on the envelope of the light source itself.
  • the light conductor it is alternatively possible to give the light conductor a straight construction and seal it in the bottom of the tube, preferably by means 'of a plastic material or a readily melting type of glass 15. Leading through can take place at the area of an omitted contact pin.
  • a sheath 13 having a light source 14 may be provided in the holder 5 of the tube (HS. 3). in order to obtain a more uniform illumination of the screen 9, two light conductor are preferably used.
  • the layer of silver l 6 may be connected to a screening means while the layer of silver 17 may serve as an electric current supply member for the screen 9.
  • This latter embodiment has the advantage that the construction of the electrodes can remain the same.
  • Light conductors are known per so. instead of a single glass rod, the light conductor may also consist of a bundle of glass wires 22 which extend parallel and are adhered together.
  • a television camera tube comprising an evacuated envelope having a transparent wall portion, a photoconductive screen having one surface facing said transparent wall portion for receiving an image of a scene, means to scan the opposite side of said screen with an electron beam thereby generating an electrical current corresponding to light variations in said scene, said scan means including an electron gun for generating an electron beam remote from the screen and means to deflect the electron beam before it impinges on the screen, means for uniformly illuminating said screen including a filaatone end.
  • a camera tube as claimed in claim 1 wherein the lightconductor comprises a bundle of parallel glass wires which are adhered together.

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Optical Couplings Of Light Guides (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
US885914A 1968-12-24 1969-12-17 Photoconductive screen deriving light thorugh light conductor from tube filament Expired - Lifetime US3628076A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NL6818583A NL160429C (nl) 1969-12-17 1968-12-24 Beeldopnamebuis van het vidicon.
US88591469A 1969-12-17 1969-12-17
US15656571A 1971-06-24 1971-06-24

Publications (1)

Publication Number Publication Date
US3628076A true US3628076A (en) 1971-12-14

Family

ID=27351479

Family Applications (2)

Application Number Title Priority Date Filing Date
US885914A Expired - Lifetime US3628076A (en) 1968-12-24 1969-12-17 Photoconductive screen deriving light thorugh light conductor from tube filament
US00156565A Expired - Lifetime US3751703A (en) 1968-12-24 1971-06-24 Vidicon having external light source adjacent sealed end, and light conductor transmitting light therefrom to target

Family Applications After (1)

Application Number Title Priority Date Filing Date
US00156565A Expired - Lifetime US3751703A (en) 1968-12-24 1971-06-24 Vidicon having external light source adjacent sealed end, and light conductor transmitting light therefrom to target

Country Status (5)

Country Link
US (2) US3628076A (de)
AT (1) AT291367B (de)
CH (1) CH500585A (de)
FR (1) FR2027026A1 (de)
GB (1) GB1240083A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3925699A (en) * 1970-07-30 1975-12-09 English Electric Valve Co Ltd Pick-up tubes
US3986070A (en) * 1972-06-15 1976-10-12 English Electric Valve Company Limited Pick-up tubes
US4019083A (en) * 1974-09-19 1977-04-19 U.S. Philips Corporation Television camera tube
US4196372A (en) * 1978-06-07 1980-04-01 Rca Corporation Pick-up tube having bias lighting and controls therefor
DE2942408A1 (de) * 1978-10-20 1980-04-30 Rca Corp Aufnahmeroehre mit einer photoleitfaehigen speicherplatte
DE2942407A1 (de) * 1978-10-20 1980-04-30 Rca Corp Aufnahmeroehre mit einer photoleitfaehigen speicherplatte und einem verzweigten lichtleiter sowie verfahren zum herstellen eines lichtleiters fuer eine solche aufnahmeroehre

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1407518A (en) * 1973-06-23 1975-09-24 English Electric Valve Co Ltd Camera tubes
NL7404731A (nl) * 1974-04-08 1975-10-10 Philips Nv Televisieopneembuis.
NL7506138A (nl) * 1975-05-26 1976-11-30 Philips Nv Televisiecamera.
US4061943A (en) * 1976-08-16 1977-12-06 Gte Sylvania Incorporated Cathode ray tube with supported conductor extending through exhaust tubulation
FR2525027A1 (fr) * 1982-04-09 1983-10-14 Radiotechnique Compelec Tube photoelectrique a dispositif d'etalonnage optique incorpore
GB2132009B (en) * 1982-12-08 1986-08-06 English Electric Valve Co Ltd Apparatus for providing light bias for a camera tube
FR2605456B1 (fr) * 1986-10-17 1988-12-09 Thomson Csf Tube de prise de vue muni d'un dispositif de polarisation lumineuse

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2131185A (en) * 1935-03-01 1938-09-27 Telefunken Gmbh Electrooptical device
US2915659A (en) * 1957-01-14 1959-12-01 David M Goodman Radiation generating and transmitting device
US3002101A (en) * 1954-03-17 1961-09-26 Westinghouse Electric Corp Image amplifier
US3048728A (en) * 1958-09-09 1962-08-07 English Electric Valve Co Ltd Television and like camera tubes

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3058021A (en) * 1958-11-24 1962-10-09 American Optical Corp Optical coupling device between x-ray intensifier and vidicon camera tube or the like
US3334236A (en) * 1964-11-23 1967-08-01 Burroughs Corp Photo-optical light pen and amplifier
NO123824B (de) * 1966-03-24 1972-01-17 Howson Ltd W H

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2131185A (en) * 1935-03-01 1938-09-27 Telefunken Gmbh Electrooptical device
US3002101A (en) * 1954-03-17 1961-09-26 Westinghouse Electric Corp Image amplifier
US2915659A (en) * 1957-01-14 1959-12-01 David M Goodman Radiation generating and transmitting device
US3048728A (en) * 1958-09-09 1962-08-07 English Electric Valve Co Ltd Television and like camera tubes

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3925699A (en) * 1970-07-30 1975-12-09 English Electric Valve Co Ltd Pick-up tubes
US3986070A (en) * 1972-06-15 1976-10-12 English Electric Valve Company Limited Pick-up tubes
US4019083A (en) * 1974-09-19 1977-04-19 U.S. Philips Corporation Television camera tube
US4196372A (en) * 1978-06-07 1980-04-01 Rca Corporation Pick-up tube having bias lighting and controls therefor
DE2942408A1 (de) * 1978-10-20 1980-04-30 Rca Corp Aufnahmeroehre mit einer photoleitfaehigen speicherplatte
DE2942407A1 (de) * 1978-10-20 1980-04-30 Rca Corp Aufnahmeroehre mit einer photoleitfaehigen speicherplatte und einem verzweigten lichtleiter sowie verfahren zum herstellen eines lichtleiters fuer eine solche aufnahmeroehre
US4259609A (en) * 1978-10-20 1981-03-31 Rca Corp. Pick-up tube having light controllable furcated light pipes

Also Published As

Publication number Publication date
FR2027026A1 (de) 1970-09-25
DE1960700B2 (de) 1976-09-09
DE1960700A1 (de) 1970-07-02
US3751703A (en) 1973-08-07
AT291367B (de) 1971-07-12
GB1240083A (en) 1971-07-21
CH500585A (de) 1970-12-15

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