US2538852A - Kinescope projection by refractive optical system mounted on tube neck - Google Patents

Kinescope projection by refractive optical system mounted on tube neck Download PDF

Info

Publication number
US2538852A
US2538852A US637976A US63797645A US2538852A US 2538852 A US2538852 A US 2538852A US 637976 A US637976 A US 637976A US 63797645 A US63797645 A US 63797645A US 2538852 A US2538852 A US 2538852A
Authority
US
United States
Prior art keywords
wall
kinescope
projection
optical system
neck
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
US637976A
Inventor
Constantin S Szegho
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.)
Rauland Borg Corp
Original Assignee
Rauland Borg 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 Rauland Borg Corp filed Critical Rauland Borg Corp
Priority to US637976A priority Critical patent/US2538852A/en
Priority to GB22848/46A priority patent/GB615177A/en
Application granted granted Critical
Publication of US2538852A publication Critical patent/US2538852A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/86Vessels; Containers; Vacuum locks
    • H01J29/89Optical or photographic arrangements structurally combined or co-operating with the vessel
    • H01J29/894Arrangements combined with the vessel for the purpose of image projection on a screen
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/74Projection arrangements for image reproduction, e.g. using eidophor
    • H04N5/7416Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal
    • H04N5/7425Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal the modulator being a dielectric deformable layer controlled by an electron beam, e.g. eidophor projector

Definitions

  • This invention relates to new and useful improvements in cathode ray tubes and particularly in cathode ray tubes of the projector type. 7
  • the object of the present invention is to solve these problems without providing said extra elements or special compensating means.
  • a portion, e. g. the neck, of a cathode ray tube passes through a perforae tion in the cooperating lens system.
  • Another feature provides for a window in the wall of the tube through which light, which originates from a concave target preferablyicarried by an opposite concave wall of the tube, may pass out of the tube. Since the target is concave towards the electron gun various parts thereof will tend tobe more equidistant from the point of beam deflection than otherwise. Moreover, once the target curvature is selected the deflecting means may be paced at such a distance from the target that the deflection of the electrons emitted by the gun follows substantially the same radius of curvature as that of the target.
  • the cathode ray tube is generally of conventional design and the elements thereof are enclosed within an envelope having a bulb portion landaneckportion2.
  • Theneck2openscen- Claims. (01. 111-319) trally through a wall 3 of the bulb I. Facing the wall 3 is a wall 4 on which a fluorescent screen 5 of any suitable composition is deposited.
  • the wall 3 must be transparent. It is shown as being perpendicular to the longitudinal axis of the neck 2, though it may be suitably curved.
  • the screen 5 is deposited either directly on the wall 4 or on a conductive coating 8 thereon.
  • the screen 5 are concave when viewed from the neck 2.
  • the wall 3 has a transparentconductive coating 1 which is electrically connected with the coating 6 with which connection may be established from the outside through lead-in wire 8.
  • the neck encloses the customary electron gun structure in which 9 is the cathode, ill the grid, H the accelerating anode, l2 the focusing anode, l3 one ofthe two horizontal deflection plates, and II the vertical deflection plates.
  • Part of the inside surface of the neck portion 2 has a conductive coating l5 which is connected with the accelerating anode l I as well as with the transparent coating 1.
  • the light produced on the screen 5 by the electron beam is projected through the window formed by transparent wall 3 and coating 1, and the light rays are projected on an outside screen by a centrally perforated lens system through which the neck projects.
  • the lens system which I have shown in the drawing is conventional, Itis composed of two crowns l6 and I9 and two flints l1 and I8,
  • the diameter of the neck portion 2 must be as small as possible so that the holes in the elements of the lens system may be of minimum size to secure maximum light transmission. With a neck diameter of approximately three-fourths of an inch, the light loss will be only about 4% to 25% of the total.
  • the entire envelope I, 2 of the cathode ray tube may be made of glass and evacuated, or the envelope may be made partly of glass and partly of metal. Only the wall 3 need be transparent. Also, instead of using a permanently evacuated envelope, the cathode ray tube may be connected with a pump and continuously evacuated during operation.
  • the adjustment and focusing of the lens system may be performed in any suitable way, and the gun structure may be modified as desired.
  • One such modification is shown in Fig. 2 in which the electrostatic deflecting plates l8 and I are replaced by magnetic deflecting coils 20 which are provided around the outer periphery of lens elements I! and I9. Otherwise the tubes shown in the two figures are identical, except that the wall I in this modification is provided with cooling fl ns 2
  • the lens system can includeaspherical elements and may be partly or wholly of glass or any other suitable plastic. Plastic is particularly recommended because the center holes can be bored exactly and without difliculty.
  • the lens system and the cathode ray tube have the same axis of symmetry.
  • the light of the fluorescent screen is taken from the bombarded and, therefore. brighter surface of the target.
  • the fluorescent screen can be deposited on a conductive support formed on or separate from the envelope, from which charges can be removed.
  • the screen may be easily cooled.
  • the fluorescent screen can be made concave to both the lens and electron beam which permits both compensating for the inherent curvature of fleld of the lens system and attaining good electrical focus on different parts of the target.
  • the over-all length of the system from viewing screen to the rear of the projector is shorter than in conventional refractive projectors. In fact, the lens system does not add at all to the length of the tube. Mechanical dimensions of the tube may permit higher speed lenses to be used.
  • I means for scanning the fluorescent layer with 1.
  • a cathode ray tube projector an evacuat- .15
  • anaccelerating anode system comprising a transparent cgn ductive coating on the flat side wall connected to said conductive layer, and a refractive lens system having a plurality of elements at least one of which has a central perforation through which the neck portion passes, the lens system, the
  • a television projector as in claim 1, and means for magnetically scanning the fluorescent layer with a beam 01 electrons from the gun, the means for scanning comprising magnets supported around the neck portion beyond the outer periphery of elements of the lens system.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Description

C. S. SZEGHO KINESCOPE PROJECTION BY REFRACTIVE OPTICAL Jan. 23, 1951 2,538,852
SYSTEM MOUNTED 0N TUBE NECK Filed D90. 29, 1945 INVENTOR. coMsTANTm E S. SZEGHO. BY
ATTORNEY.
Patented Jan. 23, 1951 KINESCOPE PROJECTION BY REFRACTIVE MOUNTED N TUBE OPTICAL SYSTEM NECK Constantin S. Sxegho,
Chi go, 111., minor to The Rauland Corporation, Chicago, 111., a corporation of Illinois Application December :9, 1945, Serial No. 637,976
1 This invention relates to new and useful improvements in cathode ray tubes and particularly in cathode ray tubes of the projector type. 7
Until recently, the use of refractive optical systems for projecting images from cathode ray tube screens has been impeded by the difliculty of fulfilling simultaneously the requirements of good electrical and optical image quality. Because of the flexibility in the electrical design, itis possible to construct tubes which compensate the more or less invariable shortcomings of the lens systems. However, these special tubes are likely :to require extra elements for controlling the electrical picture. For example, it is necessary to employ special magnetic fields toshape the scan in such a way that it compensates for distortion of a wide aperture lens. Or, to cte another example, in pipe-shaped tubes in which the beam has to travel difl'erent distances, i. e. the type of tube in which the bulb portion and the neck portion are not coaxial, it isnecessary to provide special means to compensate for the varying focus at the top and the bottom of the scan as well as means to compensate for keystone effect.
The object of the present invention is to solve these problems without providing said extra elements or special compensating means.
With this object in view, according to one feature of my invention, a portion, e. g. the neck, of a cathode ray tube passes through a perforae tion in the cooperating lens system.
Another feature provides for a window in the wall of the tube through which light, which originates from a concave target preferablyicarried by an opposite concave wall of the tube, may pass out of the tube. Since the target is concave towards the electron gun various parts thereof will tend tobe more equidistant from the point of beam deflection than otherwise. Moreover, once the target curvature is selected the deflecting means may be paced at such a distance from the target that the deflection of the electrons emitted by the gun follows substantially the same radius of curvature as that of the target.
These and other features of the invention will more clearly appear from the following description of two embodiments thereof which are illus trated in Figs. 1 and 2 of the drawings in diagrammatic side views. The same reference numerals in the two drawings designate identical The cathode ray tube is generally of conventional design and the elements thereof are enclosed within an envelope having a bulb portion landaneckportion2. Theneck2openscen- Claims. (01. 111-319) trally through a wall 3 of the bulb I. Facing the wall 3 is a wall 4 on which a fluorescent screen 5 of any suitable composition is deposited. The wall 3 must be transparent. It is shown as being perpendicular to the longitudinal axis of the neck 2, though it may be suitably curved. The screen 5 is deposited either directly on the wall 4 or on a conductive coating 8 thereon. The wall 4 and,
therefore, the screen 5 are concave when viewed from the neck 2.
The wall 3 has a transparentconductive coating 1 which is electrically connected with the coating 6 with which connection may be established from the outside through lead-in wire 8.
The neck encloses the customary electron gun structure in which 9 is the cathode, ill the grid, H the accelerating anode, l2 the focusing anode, l3 one ofthe two horizontal deflection plates, and II the vertical deflection plates.
Part of the inside surface of the neck portion 2 has a conductive coating l5 which is connected with the accelerating anode l I as well as with the transparent coating 1.
The light produced on the screen 5 by the electron beam is projected through the window formed by transparent wall 3 and coating 1, and the light rays are projected on an outside screen by a centrally perforated lens system through which the neck projects. Except for the central perforation, the lens system which I have shown in the drawing is conventional, Itis composed of two crowns l6 and I9 and two flints l1 and I8,
' which are so dimensioned and positioned as to obtain the desired magnification of the image which is projected from the screen 5 through the window 3.
The diameter of the neck portion 2 must be as small as possible so that the holes in the elements of the lens system may be of minimum size to secure maximum light transmission. With a neck diameter of approximately three-fourths of an inch, the light loss will be only about 4% to 25% of the total.
The entire envelope I, 2 of the cathode ray tube may be made of glass and evacuated, or the envelope may be made partly of glass and partly of metal. Only the wall 3 need be transparent. Also, instead of using a permanently evacuated envelope, the cathode ray tube may be connected with a pump and continuously evacuated during operation. The adjustment and focusing of the lens system may be performed in any suitable way, and the gun structure may be modified as desired. One such modification is shown in Fig. 2 in which the electrostatic deflecting plates l8 and I are replaced by magnetic deflecting coils 20 which are provided around the outer periphery of lens elements I! and I9. Otherwise the tubes shown in the two figures are identical, except that the wall I in this modification is provided with cooling fl ns 2| which are particularly desirable in a high voltage tube.
The lens system can includeaspherical elements and may be partly or wholly of glass or any other suitable plastic. Plastic is particularly recommended because the center holes can be bored exactly and without difliculty.
Among the desirable features of this inven tion are the following: The lens system and the cathode ray tube have the same axis of symmetry. The light of the fluorescent screen is taken from the bombarded and, therefore. brighter surface of the target. The fluorescent screen can be deposited on a conductive support formed on or separate from the envelope, from which charges can be removed. The screen may be easily cooled. The fluorescent screen can be made concave to both the lens and electron beam which permits both compensating for the inherent curvature of fleld of the lens system and attaining good electrical focus on different parts of the target. The over-all length of the system from viewing screen to the rear of the projector is shorter than in conventional refractive projectors. In fact, the lens system does not add at all to the length of the tube. Mechanical dimensions of the tube may permit higher speed lenses to be used.
What I claim is:
electron gun and the concave wall having 'a. common axis of symmetry.
2. In a television projector as in claim 1. and
I means for scanning the fluorescent layer with 1. In a cathode ray tube projector, an evacuat- .15
of magnitude as that of the fluorescent layer, an
electron gun within the necl; portion cooperating 4 with the fluorescent layer, anaccelerating anode system comprising a transparent cgn ductive coating on the flat side wall connected to said conductive layer, and a refractive lens system having a plurality of elements at least one of which has a central perforation through which the neck portion passes, the lens system, the
a beam of electrons from the gun. said means being at a distance from. the concave wall approximately equal to the radius 01' curvature thereof.
3. In a television projector as in claim 1, in which at least one or the elements or the lens system is made of plastic material other than glass.
4. In a television projector as in claim 1, and means for magnetically scanning the fluorescent layer with a beam 01 electrons from the gun, the means for scanning comprising magnets supported around the neck portion beyond the outer periphery of elements of the lens system.
5. In a television projector as in claim 1, and means outside of the wall which has a curved inside surface for cooling said wall and the fluorescent layer on said surface.
CONSTANTIN S. SZEGHO.
' REFERENCES CITED The following references are 01' record in the flle of this patent:
UNITED STATES PA'I'ENTS Number Name Date 1,749,278 Frederick Mar. 4, 1930 2,050,411 Barthelemy Aug. 11, 1936 2,051,632 Batchelor Aug. 18, 1936 2,086,546 George July 13, 1937 2,089,546 Dudding et a1. Aug. 10, 1937 2,166,399 Dowsett et a1 July 18, 1939 2,241,974 Anderson et al May 13, 1941 2,254,090 Power Aug. 26, 1941 2,273,801 Landis Feb. 17, 1942 2,292,979 Wald Aug. 11, 1942 2,305,855 Epstein et al Dec. 22, 1942 2,409,971 Bennett Oct. 22, 1946 FOREIGN PATENTS Number Country Date 836,698 France Jan. 24, 1939. 453,043 Great Britain Sept. 3, 1936 463,891 Great Britain Apr. 8, 1937 OTHER REFERENCES 5,, Television and Short Wave World. vol. 12, 1939,
page 393.
US637976A 1945-12-29 1945-12-29 Kinescope projection by refractive optical system mounted on tube neck Expired - Lifetime US2538852A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US637976A US2538852A (en) 1945-12-29 1945-12-29 Kinescope projection by refractive optical system mounted on tube neck
GB22848/46A GB615177A (en) 1945-12-29 1946-07-31 Improvements in or relating to cathode ray tube apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US637976A US2538852A (en) 1945-12-29 1945-12-29 Kinescope projection by refractive optical system mounted on tube neck

Publications (1)

Publication Number Publication Date
US2538852A true US2538852A (en) 1951-01-23

Family

ID=24558139

Family Applications (1)

Application Number Title Priority Date Filing Date
US637976A Expired - Lifetime US2538852A (en) 1945-12-29 1945-12-29 Kinescope projection by refractive optical system mounted on tube neck

Country Status (2)

Country Link
US (1) US2538852A (en)
GB (1) GB615177A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3014148A (en) * 1958-04-21 1961-12-19 United Aircraft Corp Infrared photo-imaging device
US3209072A (en) * 1961-06-26 1965-09-28 Gen Electric Light projection electron beam writing system
US3352970A (en) * 1963-04-12 1967-11-14 Matsushita Electric Ind Co Ltd Cathode ray tubes and apparatus using the same

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1749278A (en) * 1928-11-27 1930-03-04 Eastman Kodak Co Optical system for use in photographic color processes
US2050411A (en) * 1930-12-20 1936-08-11 Cfcmug Receiving apparatus for television
US2051632A (en) * 1932-01-15 1936-08-18 Rca Corp Television receiving system
GB453043A (en) * 1935-01-30 1936-09-03 Telefunken Gmbh Improvements in or relating to cathode ray tube television and like reproducer apparatus
GB463891A (en) * 1936-02-05 1937-04-08 Gen Electric Co Ltd Improvements in or relating to cathode-ray apparatus for receiving television and the like
US2086546A (en) * 1929-09-14 1937-07-13 Rca Corp Oscillograph
US2089546A (en) * 1933-12-19 1937-08-10 Gen Electric Co Ltd Cathode ray tube
FR836698A (en) * 1937-04-15 1939-01-24 Fernseh Ag observation screen for braun tubes, preferably for projection
US2166399A (en) * 1935-01-16 1939-07-18 Rca Corp Television and like receiver
US2241974A (en) * 1938-04-05 1941-05-13 Gen Electric High power cathode ray device
US2254090A (en) * 1940-04-30 1941-08-26 Rca Corp Cathode ray tube envelope
US2273801A (en) * 1938-12-30 1942-02-17 Rca Corp Television receiver
US2292979A (en) * 1940-08-03 1942-08-11 Wald George Television apparatus
US2305855A (en) * 1941-07-31 1942-12-22 Rca Corp Television apparatus
US2409971A (en) * 1945-06-19 1946-10-22 Eastman Kodak Co Catadioptric television projector

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1749278A (en) * 1928-11-27 1930-03-04 Eastman Kodak Co Optical system for use in photographic color processes
US2086546A (en) * 1929-09-14 1937-07-13 Rca Corp Oscillograph
US2050411A (en) * 1930-12-20 1936-08-11 Cfcmug Receiving apparatus for television
US2051632A (en) * 1932-01-15 1936-08-18 Rca Corp Television receiving system
US2089546A (en) * 1933-12-19 1937-08-10 Gen Electric Co Ltd Cathode ray tube
US2166399A (en) * 1935-01-16 1939-07-18 Rca Corp Television and like receiver
GB453043A (en) * 1935-01-30 1936-09-03 Telefunken Gmbh Improvements in or relating to cathode ray tube television and like reproducer apparatus
GB463891A (en) * 1936-02-05 1937-04-08 Gen Electric Co Ltd Improvements in or relating to cathode-ray apparatus for receiving television and the like
FR836698A (en) * 1937-04-15 1939-01-24 Fernseh Ag observation screen for braun tubes, preferably for projection
US2241974A (en) * 1938-04-05 1941-05-13 Gen Electric High power cathode ray device
US2273801A (en) * 1938-12-30 1942-02-17 Rca Corp Television receiver
US2254090A (en) * 1940-04-30 1941-08-26 Rca Corp Cathode ray tube envelope
US2292979A (en) * 1940-08-03 1942-08-11 Wald George Television apparatus
US2305855A (en) * 1941-07-31 1942-12-22 Rca Corp Television apparatus
US2409971A (en) * 1945-06-19 1946-10-22 Eastman Kodak Co Catadioptric television projector

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3014148A (en) * 1958-04-21 1961-12-19 United Aircraft Corp Infrared photo-imaging device
US3209072A (en) * 1961-06-26 1965-09-28 Gen Electric Light projection electron beam writing system
US3352970A (en) * 1963-04-12 1967-11-14 Matsushita Electric Ind Co Ltd Cathode ray tubes and apparatus using the same

Also Published As

Publication number Publication date
GB615177A (en) 1949-01-03

Similar Documents

Publication Publication Date Title
US3448316A (en) Cathode ray tube
US2690517A (en) Plural beam electron gun
US2520190A (en) Cathode-ray tube
US2467462A (en) Electrooptical projection apparatus
US2538852A (en) Kinescope projection by refractive optical system mounted on tube neck
US3457401A (en) Light projection system
US2803770A (en) Electron discharge tube apparatus
US2663012A (en) Projection television tube
US2166399A (en) Television and like receiver
US2336134A (en) Color television system
US3866079A (en) Television camera tube in which the detrimental effect of the return beam is counteracted
GB458744A (en) Improvements in and relating to cathode ray tubes
US2569654A (en) Cathode-ray tube
US4481445A (en) Electron gun for projection television cathode ray tubes
JP2603415B2 (en) Electron gun for color cathode ray tube
US2213688A (en) Cathode ray tube
US3579010A (en) Elongated aperture electron gun structure for flat cathode-ray tube
US2459637A (en) Cathode-ray image-translating device
US2869024A (en) Television pick-up tube
US2435296A (en) Cathode-ray tube projector
US2248558A (en) Television tube
US2163546A (en) Apparatus and method for television reception
KR900004260B1 (en) Cathod ray tube
US3027479A (en) Electron guns
US2152825A (en) Braun tube