US3893750A - Cathode-ray tube screening correction lens with a non-solarizing material - Google Patents

Cathode-ray tube screening correction lens with a non-solarizing material Download PDF

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Publication number
US3893750A
US3893750A US356454A US35645473A US3893750A US 3893750 A US3893750 A US 3893750A US 356454 A US356454 A US 356454A US 35645473 A US35645473 A US 35645473A US 3893750 A US3893750 A US 3893750A
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United States
Prior art keywords
screen
silicone resin
paths
effective surface
correcting
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
US356454A
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English (en)
Inventor
Amato Ralph James D
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 Licensing Corp
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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
Application filed by RCA Corp filed Critical RCA Corp
Priority to US356454A priority Critical patent/US3893750A/en
Priority to IT42667/74A priority patent/IT1010922B/it
Priority to NL7405487A priority patent/NL7405487A/xx
Priority to BE143759A priority patent/BE814360A/xx
Priority to FR7415028A priority patent/FR2228229B1/fr
Priority to BR3501/74A priority patent/BR7403501D0/pt
Priority to GB1903474A priority patent/GB1472926A/en
Priority to JP49049636A priority patent/JPS5016549A/ja
Priority to AU68458/74A priority patent/AU475196B2/en
Priority to DE2421255A priority patent/DE2421255B2/de
Priority to CA198,772A priority patent/CA1016377A/en
Application granted granted Critical
Publication of US3893750A publication Critical patent/US3893750A/en
Priority to SU762384242A priority patent/SU592343A3/ru
Assigned to RCA LICENSING CORPORATION, TWO INDEPENDENCE WAY, PRINCETON, NJ 08540, A CORP. OF DE reassignment RCA LICENSING CORPORATION, TWO INDEPENDENCE WAY, PRINCETON, NJ 08540, A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: RCA CORPORATION, A CORP. OF DE
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
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
    • H01J29/18—Luminescent screens
    • H01J29/30—Luminescent screens with luminescent material discontinuously arranged, e.g. in dots, in lines
    • H01J29/32—Luminescent screens with luminescent material discontinuously arranged, e.g. in dots, in lines with adjacent dots or lines of different luminescent material, e.g. for colour television
    • H01J29/327—Black matrix materials
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/20—Manufacture of screens on or from which an image or pattern is formed, picked up, converted or stored; Applying coatings to the vessel
    • H01J9/22—Applying luminescent coatings
    • H01J9/227—Applying luminescent coatings with luminescent material discontinuously arranged, e.g. in dots or lines
    • H01J9/2271—Applying luminescent coatings with luminescent material discontinuously arranged, e.g. in dots or lines by photographic processes
    • H01J9/2272—Devices for carrying out the processes, e.g. light houses
    • H01J9/2273—Auxiliary lenses and filters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/20—Manufacture of screens on or from which an image or pattern is formed, picked up, converted or stored; Applying coatings to the vessel
    • H01J9/22—Applying luminescent coatings
    • H01J9/227—Applying luminescent coatings with luminescent material discontinuously arranged, e.g. in dots or lines
    • H01J9/2278—Application of light absorbing material, e.g. between the luminescent areas

Definitions

  • the device comprises a rigid transparent [51] 1 l3/l8. Gozb 3/04 substrate, such as glass, and a nonsolarizing polymer [58 ⁇ Fieid 350/189 175 N6 layer, such as silicone resin, on the substrate. An effective surface is formed on the surface of the polymer Reierences Cited layer opposite the substrate.
  • cathode-ray tubes have mosaic screens or targets of different light emitting or absorbing material.
  • certain types of color television picture tubes usually include a screen comprising arrays of red, green, and blue emitting phosphor lines or dots, electron gun means for exciting the screen, and a color selection electrode e.g., an apertured sheet metal mask or a wire grill, interposed between the gun means and the screen.
  • a color selection electrode e.g., an apertured sheet metal mask or a wire grill
  • the inner surface of the faceplate is coated with a mixture of phosphor particles adapted to emit light of one of the three colors (e.g., green). and a photosensitive binder.
  • the light source is sequentially placed in a fixed relationship with each center of deflection of each of the electron beams which later will excite the screen.
  • these deflection centers are not similarly fixed in position but rather vary in position during operation of the tube.
  • One such variation is a shift toward the screen as the angle of deflection increases. This shift of the deflection center parallel to the tube axis causes a radial misregister of the electron impingement spots on the screen with respect to their corresponding phosphor dots established using a fixed light source.
  • correcting lenses located between the light source and the tube screen which pro vide appropriate deflection of the light rays so as to locate the position of the phosphor dots at the expected landing positions on the screen of the electron beams.
  • the design of correcting lenses for use in fabricating color television picture tubes has been described by Epstein et al in U.S. Pat. Nos. 2,817,276 and 2,885,935, by Ramberg in US. Pat. No. 3,279,340 and more recently by Yamazaki et al. in US. Pat. No.
  • the present invention provides a less expensive lens than lenses constructed completely out of glass.
  • the present invention provides a refractive device such as for use in the formation of a color picture tube screen. At least a portion of the device has an effective surface thereon for changing paths of light rays passing through the device lens.
  • the portion is constructed of a polymer that is substantially nonsolarizing when exposed to ultraviolet radiation in the 290 to 400 nanometer range.
  • FIG. 1 is a perspective view of a correcting lens embodying the present invention.
  • FIG. 2 is a perspective view of a second correcting lens embodying the present invention.
  • FIG. 3 is a cross-sectional view of a lens package in corporating the lens of FIG. 2.
  • FIG. 4 is a cross-sectional view of a second lens package incorporating the lens of FIG. 2.
  • FIG. 5 is a cross-sectional view of a third lens package incorporating the lens of FIG. 2.
  • FIG. 6 is a cross-sectional view of a fourth lens package incorporating the lens of FIG. 2.
  • FIG. 1 illustrates a refracting device or correcting lens 10 formed with a rigid transparent substrate 12.
  • a thinner transparent nonsolarizing polymer layer 14 is uniformly attached to the substrate 12.
  • a surface 16 of the layer 14, opposite the substrate 12, is the effective surface of the lens 10. The surface 16 is contoured to provide correction of the light path to the different areas of the screen to prevent misregister.
  • the substrate 12 is /4 inch thick optical glass of suitable quality, such as a glass manufactured by Schott Glass, Inc. designated 8K7.
  • the transparent polymer layer 14 may be any polymer that has good ultraviolet transmission characteristics, resists solarization in the wavelength range of 290 to 400 nanometers and exhibits low shrinkage.
  • a material that meets these criteria, and has been found to be preferable is transparent silicone resin.
  • One silicone resin that has been found suitable for layer 14 is manufactured by Dow-Corning. Inc., and is designated R63- 489.
  • the silicone resin layer can be any reasonable thickness, as long as it is thick enough to accomodate the irregularities of the effective surface. A thickness of I mils has been found to be satisfactory for the lens of FIG. I.
  • the lens 10 can be formed by any suitable construction technique.
  • a primer such as manufactured by Dow-Corning and designated Sylgard, is first applied to the glass substrate 12. Then liq uid silicone resin, such as R63-489 is mixed with a hardener, such as that provided by Dow-Corning with the R63-4 89, and is injected into a mold between a die contoured with a reverse effective surface shape and the glass substrate. After the silicone resin has hardened, one side of it adheres to the primed glass substrate while the other side contains the effective surface.
  • a primer has been used in this preferred method to ensure adhesion of the silicone resin to the substrate. adequate adhesion may be attained without use of the primer.
  • FIG. 2 depicts a second correcting lens 18 also formed with a rigid transparent substrate 20 and a thin transparent polymer layer 22.
  • the effective surface 24 of this lens I8 is divided into a plurality of segments 26 each of which provide individualized optical correction for corresponding parts of the tube screen during screen formation by known photoprinting methods.
  • the preferred materials and dimensions used to construct lens 18 are the same as those described with respect to lens I0 except that a thickness of 30 to mils is sufficient for the polymer layer since the variations from the mean surface level seldom exceed l0 mils.
  • Discontinuous interfaces 28 are located between each of the segments 26 of the lens 18. A portion of the light passing through the lens 18 may reflect and scatter therefrom. Therefore, it may be desirable to mask these as described in a copending application entitled Color Television Picture Tube Screening Method" by van Hekken now U.S. Pat. No. 3,782,253. Four masking techniques are shown in FIGS. 3, 4, 5 and 6.
  • a lens package 30 shown in FIG. 3, the lens 18 is covered with a second rigid transparent substrate 32 having an opaque pattern 34, corresponding to the discontinuity pattern, thereon.
  • the second substrate 32 is separated from the effective surface of lens 18 by an air gap 36.
  • a second lens package 38 is shown in FIG. 4.
  • an opaque material 40 is coated directly onto the effective surface of lens 18 at the locations of the surface discontinuities 28.
  • FIG. 5 shows a third lens package 42 wherein the masking pattern is a grid or grill 44 embedded in the polymer material of the layer 22.
  • a fourth lens package 46 shown in FIG. 6, an opaque pattern is coated directly onto the substrate 20 before the polymer layer is applied.
  • a preferred opaque material for the lens packages 30, 38 and 46 is graphite.
  • All of the foregoing device embodiments have included a rigid substrate and polymer layer.
  • Such construction takes advantage of the fact that relatively inexpensive materials that are dimensionally stable and readily finished to desired optical requirements, such as glasses, can be used to support thinlayers of a relatively expensive nonsolarizing polymer. Therefore, the overall cost of a lens so constructed can be significantly less than a lens constructed entirely of the nonsolarizing lens material.
  • lens has been used in describing the prior art and the preferred embodiments, it is to be understood that such term has been in long use in the television screening art to describe refractive devices that change or correct paths of light rays but do not provide focusing. It also should be noted that for various reasons known in the art, light ray path correction may not be made to exactly correspond to the path an electron beam will take in striking the screen. For ex ample, in a compromise to compensate for mask doming caused by heat expansion, it may be desirable to provide slight misregister. Therefore, the correction lens may provide light path corrections to parts of the screen to substantially, but not exactly, correspond them to the paths electron beams will take.
  • a refractive device for correcting the paths oflight rays in the formation of a color television picture tube screen comprising,
  • said device having an effective surface thereon for correcting paths of light rays passing therethrough during formation of said screen to substantially correspond to paths electron beams will take in striking the screen in a completed tube, said portion being a silicone resin that is substantially nonsolarizing when exposed to ultraviolet radiation in the range of 290 to 400 nanometers, and
  • a rigid transparent substrate for supporting said portion.
  • said effective surface has at least one surface discontinuity and said substrate includes a mask pattern on a surface thereof, said mask pattern aligned with said discontinuity.
  • a refractive device for correcting the paths of light rays in the formation of a color television picture tube screen comprising,
  • a transparent silicone resin layer uniformly attached to said substrate said silicone resin being a material having good ultraviolet transmission characteristics and being resistant to solarization in the ultraviolet wavelength range of 290 to 400 nanometers of color television picture tube screening devices, said silicone resin layer having an effective surface thereon for correcting paths of light rays passing therethrough during formation of said screen to 6 substantially correspond to paths electron beams 8.
  • the sili- The device as defined in Claim 8 whgrein thick cone resin has ultraviolet transmission characteristics and solarization resistance similar to a silicone resin manufactured by DowwCorning, Inc. and designated R63-489.
  • ness of said polymer layer is within the range of 30 to 40 mils.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
US356454A 1973-05-02 1973-05-02 Cathode-ray tube screening correction lens with a non-solarizing material Expired - Lifetime US3893750A (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
US356454A US3893750A (en) 1973-05-02 1973-05-02 Cathode-ray tube screening correction lens with a non-solarizing material
IT42667/74A IT1010922B (it) 1973-05-02 1974-04-05 Dispositivo a rifrangenza e metodo di fabbricazione dello stesso
NL7405487A NL7405487A (Direct) 1973-05-02 1974-04-24
BE143759A BE814360A (fr) 1973-05-02 1974-04-29 Dispositif refringent
BR3501/74A BR7403501D0 (pt) 1973-05-02 1974-04-30 Dispositivo aperfeicoado de refracao
FR7415028A FR2228229B1 (Direct) 1973-05-02 1974-04-30
GB1903474A GB1472926A (en) 1973-05-02 1974-05-01 Refractive device for use in the formation of colour television picture tube screens
JP49049636A JPS5016549A (Direct) 1973-05-02 1974-05-01
AU68458/74A AU475196B2 (en) 1973-05-02 1974-05-01 Refractive device
DE2421255A DE2421255B2 (de) 1973-05-02 1974-05-02 Optische Korrekturlinse für ein Projektionssystem und Verfahren zu ihrer Herstellung
CA198,772A CA1016377A (en) 1973-05-02 1974-05-02 Refracting device of the cathode-ray tube correcting lens type
SU762384242A SU592343A3 (ru) 1973-05-02 1976-07-09 Способ изготовлени изделий типа корректирующих линз

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US356454A US3893750A (en) 1973-05-02 1973-05-02 Cathode-ray tube screening correction lens with a non-solarizing material

Publications (1)

Publication Number Publication Date
US3893750A true US3893750A (en) 1975-07-08

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Family Applications (1)

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US356454A Expired - Lifetime US3893750A (en) 1973-05-02 1973-05-02 Cathode-ray tube screening correction lens with a non-solarizing material

Country Status (12)

Country Link
US (1) US3893750A (Direct)
JP (1) JPS5016549A (Direct)
AU (1) AU475196B2 (Direct)
BE (1) BE814360A (Direct)
BR (1) BR7403501D0 (Direct)
CA (1) CA1016377A (Direct)
DE (1) DE2421255B2 (Direct)
FR (1) FR2228229B1 (Direct)
GB (1) GB1472926A (Direct)
IT (1) IT1010922B (Direct)
NL (1) NL7405487A (Direct)
SU (1) SU592343A3 (Direct)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4235503A (en) * 1978-05-08 1980-11-25 Condon Chris J Film projection lens system for 3-D movies
WO1985000060A1 (en) * 1983-06-15 1985-01-03 Neal Keith Jones Thin plastic corrector lenses for optical systems

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52140343U (Direct) * 1976-04-17 1977-10-24
JPS52143847A (en) * 1976-05-26 1977-11-30 Mitsubishi Electric Corp Optical lens
IT1115189B (it) * 1978-05-30 1986-02-03 Rca Corp Lente fresnel
JPS5649501U (Direct) * 1979-09-25 1981-05-01
JPS59180506A (ja) * 1983-03-30 1984-10-13 Toshiba Electric Equip Corp 制光体
JPS59180502A (ja) * 1983-03-30 1984-10-13 Toshiba Electric Equip Corp 制光体

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3279340A (en) * 1964-03-19 1966-10-18 Rca Corp Art of making color-phosphor mosaic screens
US3486825A (en) * 1965-05-10 1969-12-30 Bradford Howland Optical test equipment and methods for making and using same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3279340A (en) * 1964-03-19 1966-10-18 Rca Corp Art of making color-phosphor mosaic screens
US3486825A (en) * 1965-05-10 1969-12-30 Bradford Howland Optical test equipment and methods for making and using same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4235503A (en) * 1978-05-08 1980-11-25 Condon Chris J Film projection lens system for 3-D movies
WO1985000060A1 (en) * 1983-06-15 1985-01-03 Neal Keith Jones Thin plastic corrector lenses for optical systems
US4650275A (en) * 1983-06-15 1987-03-17 Jones Neal K Thin plastic corrector lenses for optical systems

Also Published As

Publication number Publication date
BE814360A (fr) 1974-08-16
NL7405487A (Direct) 1974-11-05
GB1472926A (en) 1977-05-11
SU592343A3 (ru) 1978-02-05
IT1010922B (it) 1977-01-20
FR2228229A1 (Direct) 1974-11-29
AU475196B2 (en) 1976-08-12
FR2228229B1 (Direct) 1977-06-24
DE2421255A1 (de) 1974-11-14
JPS5016549A (Direct) 1975-02-21
DE2421255B2 (de) 1979-06-21
BR7403501D0 (pt) 1974-11-19
AU6845874A (en) 1975-11-06
CA1016377A (en) 1977-08-30

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AS Assignment

Owner name: RCA LICENSING CORPORATION, TWO INDEPENDENCE WAY, P

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:RCA CORPORATION, A CORP. OF DE;REEL/FRAME:004993/0131

Effective date: 19871208