US3811754A - Correcting lens - Google Patents

Correcting lens Download PDF

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Publication number
US3811754A
US3811754A US00298642A US29864272A US3811754A US 3811754 A US3811754 A US 3811754A US 00298642 A US00298642 A US 00298642A US 29864272 A US29864272 A US 29864272A US 3811754 A US3811754 A US 3811754A
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US
United States
Prior art keywords
lens
elements
correcting
correcting lens
screen
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
US00298642A
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English (en)
Inventor
A Morrell
Hekken F Van
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
Original Assignee
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 US00298642A priority Critical patent/US3811754A/en
Priority to AU60810/73A priority patent/AU472436B2/en
Priority to IT29615/73A priority patent/IT995546B/it
Priority to GB4592373A priority patent/GB1450589A/en
Priority to CA183,372A priority patent/CA998270A/en
Priority to BE136759A priority patent/BE806154A/xx
Priority to JP48116269A priority patent/JPS4975155A/ja
Priority to NL7314290A priority patent/NL7314290A/xx
Priority to DE19732352363 priority patent/DE2352363C3/de
Priority to FR7337184A priority patent/FR2203984B1/fr
Application granted granted Critical
Publication of US3811754A publication Critical patent/US3811754A/en
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
    • 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
    • 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

Definitions

  • This invention relates to optical correcting lenses for use in laying down arrays of color phosphor deposits in cathode-ray tubes.
  • 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., blue), 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.
  • the prior art has provided correcting lenses located between the light source and the tube screen which provide 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 present invention substantially eliminates undesirable reflection and scatter by providing a correcting lens for use in the formation of a color television picture tube screen having a plurality of individually contoured elements that extend from a point common to all elements to an edge of the lens.
  • FIG. 1 is a plan view of a correcting lens embodying the present invention
  • FIG. 2 is a cross-sectional view taken on line 22 of FIG. 1.
  • FIG. 3 is a cross-sectional view taken on line 3--3 of FIG. 1.
  • FIG. 4 is a plan view of another correcting lens embodying the present invention.
  • FIG. 5 is a cross-sectional view taken on line 55 of FIG. 4.
  • FIG. 6 is a plan view of yet another correcting lens embodying the present invention.
  • FIG. 7 is a cross-sectional view taken on line 7-7 of FIG. 6.
  • FIG. 1 illustrates a pie-shaped lens 10 formed from eight wedge-shaped elements or segments l2, l3, l4, 19.
  • the lens 10 is used in an optical lighthouse between a light source and a color picture tube faceplate to provide optical correction of the light path so that the light exposes photosensitizled portions on the faceplate at the predicted landing locations of the electron beams of the assembled tube.
  • the surfaces I2, l3, l4 19' of the elements in the lens 10 are individually contoured to provide the best overall optical correction for exposure of correspondingly shaped areas of the color television picture tube screen. Because of this in dividual contouring, each lens element has a considerably different surface shape than its adjacent elements, as shown in FIGS.
  • the lens comprises a plurality of discontinuous interfaces located between adjacent elements e.g., interface 20 between elements 16 and 17, 22 between 17 and 18, 24 between 18 and 19.
  • Each interface consists of an internal portion, where the adjacent elements are in physical contact, and an external stepped portion comprising a part of the surface of the lens.
  • These interfaces could cause reflection inside the lens and at the surface of the lens if light from the light source were to strike the interfaces at an angle.
  • lens 10 is placed in the lighthouse so that its central axis 26 points to or is aligned with the light source, the edges of the interfaces are parallel with the light rays. Therefore, since the lightrays cannot strike the interfaces at an angle, reflection and scattering cannot occur.
  • FIG. 4 Another pie-shaped lens 30, having twelve wedgeshaped elements 32, 33, 34, 43, is shown in FIG. 4. Unlike the preceding embodiment, this lens 30 is formed with a continuous contoured surface 44 as shown in FIG. 5. However, elements in this lens are formed of various materials having different indexes of refraction. Therefore, although the lens surface is continuous, discontinuities in correction can exist between each element because of the differences in indexes of refraction. Optimization of the lens depends not only on appropriate contouring of the lens surface, but also in proper choice of the materials selected for each element.
  • discontinuities e.g., discontinuity 46 between elements 38 and 39, 48 between 39 and 40, 50 between 40 and 41, 52 between 41 and 42, and 54 be tween 42 and 43 in this lens 30 are all internal interfaces since the lens has no surface discontinuities.
  • a third lens 60 is shown in the plan and crosssectional views of FIGS. 6 and 7.
  • This lens 60 comprises a single homogeneous piece of material having only its surface designed in a pie-shaped configuration.
  • the lens surface 61 is divided into twelve sector-shaped surface elements or areas, e.g., 62, 63, 64, 73. Each surface area has its own contour to provide the best optical correction to similarly shaped corresponding areas of the screw. Because of this individual contouring, surface discontinuities or steps exist between adjacent surface areas, e.g., discontinuity 74 between areas 68 and 69, 76 between 69 and 70, 78 between 70 and 71, 80 between 71 and 72, and 82 between 72 and 73.
  • each discontinuity passes through and is parallel with the axis of the lens. Therefore, when the lens axis points to or is aligned with a light source, the light rays from the source will pass through the lens parallel to the discontinuities and will not reflect or scatter.
  • lens 30 of FIGS. 4 and can be formed of glass and lens 60 of FIGS. 6 and 7 can be formed of plastic.
  • plastics development as to lens 30
  • lens 60 of FIGS. 6 and 7
  • plastics development as to lens 30
  • lens 60 of glass
  • the plastic is pressure molded against a suitable die.
  • Such die can consist of segments, corresponding to the lens elements, of a material such as stainless steel that have been ground to conform to the lens specification.
  • a correcting lens for use in the formation of a color television picture tube screen comprising a plurality of wedgeshaped elements, a discontinuity between each adjacent element and each of said discontinuities extending from a common point radially to an edge of said lens, and each of said elements being individually contoured for best overall optical correction to light paths for exposure of correspondingly shaped areas of said screen for a source of said light paths on a line passing through said common point and perpendicular to a surface of said lens.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
US00298642A 1972-10-18 1972-10-18 Correcting lens Expired - Lifetime US3811754A (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
US00298642A US3811754A (en) 1972-10-18 1972-10-18 Correcting lens
AU60810/73A AU472436B2 (en) 1972-10-18 1973-09-27 Correcting lens
IT29615/73A IT995546B (it) 1972-10-18 1973-10-01 Lente di correzione
GB4592373A GB1450589A (en) 1972-10-18 1973-10-02 Correcting lens
CA183,372A CA998270A (en) 1972-10-18 1973-10-15 Correcting lens for color cathode ray tubes
JP48116269A JPS4975155A (it) 1972-10-18 1973-10-16
BE136759A BE806154A (fr) 1972-10-18 1973-10-16 Lentilles de correction notamment pour la realisation de cinescopes
NL7314290A NL7314290A (it) 1972-10-18 1973-10-17
DE19732352363 DE2352363C3 (de) 1972-10-18 1973-10-18 Korrekturlinse zur Herstellung eines Farbiernseh-Bildröhrenschirmes
FR7337184A FR2203984B1 (it) 1972-10-18 1973-10-18

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00298642A US3811754A (en) 1972-10-18 1972-10-18 Correcting lens

Publications (1)

Publication Number Publication Date
US3811754A true US3811754A (en) 1974-05-21

Family

ID=23151399

Family Applications (1)

Application Number Title Priority Date Filing Date
US00298642A Expired - Lifetime US3811754A (en) 1972-10-18 1972-10-18 Correcting lens

Country Status (9)

Country Link
US (1) US3811754A (it)
JP (1) JPS4975155A (it)
AU (1) AU472436B2 (it)
BE (1) BE806154A (it)
CA (1) CA998270A (it)
FR (1) FR2203984B1 (it)
GB (1) GB1450589A (it)
IT (1) IT995546B (it)
NL (1) NL7314290A (it)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3936151A (en) * 1972-12-04 1976-02-03 Hitachi, Ltd. Correction lenses utilized to form fluorescent screens of colour picture tubes
DE3305979A1 (de) * 1983-02-21 1984-08-23 Richard 8901 Neusäß Wallner Lichtverdichter
EP0354786A2 (en) * 1988-08-12 1990-02-14 Minnesota Mining And Manufacturing Company Multifocal diffractive lens
WO2011033437A1 (en) * 2009-09-18 2011-03-24 Koninklijke Philips Electronics N.V. Luminaire and optical component

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1952237A (en) * 1930-11-24 1934-03-27 Ylla-Conte Jose Lens for the concentration of solar heat
GB791312A (en) * 1953-03-26 1958-02-26 Theodore Hendrik Nakken Photographic objectives
US2999126A (en) * 1958-05-29 1961-09-05 Harries Television Res Ltd Facetted correction lens for minimizing keystoning of off-axis projectors
US3495511A (en) * 1967-10-05 1970-02-17 Nat Video Corp Heterogeneous lens for forming phosphor patterns on color kinescope
US3628850A (en) * 1970-02-24 1971-12-21 Hitachi Ltd Correcting lens

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4918572A (it) * 1972-06-14 1974-02-19

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1952237A (en) * 1930-11-24 1934-03-27 Ylla-Conte Jose Lens for the concentration of solar heat
GB791312A (en) * 1953-03-26 1958-02-26 Theodore Hendrik Nakken Photographic objectives
US2999126A (en) * 1958-05-29 1961-09-05 Harries Television Res Ltd Facetted correction lens for minimizing keystoning of off-axis projectors
US3495511A (en) * 1967-10-05 1970-02-17 Nat Video Corp Heterogeneous lens for forming phosphor patterns on color kinescope
US3628850A (en) * 1970-02-24 1971-12-21 Hitachi Ltd Correcting lens

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3936151A (en) * 1972-12-04 1976-02-03 Hitachi, Ltd. Correction lenses utilized to form fluorescent screens of colour picture tubes
DE3305979A1 (de) * 1983-02-21 1984-08-23 Richard 8901 Neusäß Wallner Lichtverdichter
EP0354786A2 (en) * 1988-08-12 1990-02-14 Minnesota Mining And Manufacturing Company Multifocal diffractive lens
EP0354786A3 (en) * 1988-08-12 1991-08-14 Minnesota Mining And Manufacturing Company Multifocal diffractive lens
WO2011033437A1 (en) * 2009-09-18 2011-03-24 Koninklijke Philips Electronics N.V. Luminaire and optical component
CN102549333A (zh) * 2009-09-18 2012-07-04 皇家飞利浦电子股份有限公司 灯具和光学元件
US8746936B2 (en) 2009-09-18 2014-06-10 Koninklijke Philips N.V. Luminaire and optical component
CN102549333B (zh) * 2009-09-18 2014-12-10 皇家飞利浦电子股份有限公司 灯具和光学元件

Also Published As

Publication number Publication date
FR2203984A1 (it) 1974-05-17
GB1450589A (en) 1976-09-22
DE2352363A1 (de) 1974-05-09
NL7314290A (it) 1974-04-22
AU6081073A (en) 1975-03-27
DE2352363B2 (de) 1976-04-15
JPS4975155A (it) 1974-07-19
FR2203984B1 (it) 1976-05-07
AU472436B2 (en) 1976-05-27
IT995546B (it) 1975-11-20
CA998270A (en) 1976-10-12
BE806154A (fr) 1974-02-15

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Date Code Title Description
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