US3009015A - Color-image-reproducing apparatus of the image-projection type - Google Patents

Color-image-reproducing apparatus of the image-projection type Download PDF

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Publication number
US3009015A
US3009015A US498918A US49891855A US3009015A US 3009015 A US3009015 A US 3009015A US 498918 A US498918 A US 498918A US 49891855 A US49891855 A US 49891855A US 3009015 A US3009015 A US 3009015A
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United States
Prior art keywords
image
focus
tube
cathode
color
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
US498918A
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English (en)
Inventor
William F Bailey
Robert P Burr
Frederick C Hallden
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Hazeltine Research Inc
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Hazeltine Research Inc
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 to NL205895D priority Critical patent/NL205895A/xx
Priority to BE546721D priority patent/BE546721A/xx
Application filed by Hazeltine Research Inc filed Critical Hazeltine Research Inc
Priority to US498918A priority patent/US3009015A/en
Priority to GB7648/56A priority patent/GB784570A/en
Priority to DEH26655A priority patent/DE1064099B/de
Priority to CH338865D priority patent/CH338865A/de
Priority to FR1148979D priority patent/FR1148979A/fr
Application granted granted Critical
Publication of US3009015A publication Critical patent/US3009015A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/16—Picture reproducers using cathode ray tubes
    • H04N9/18—Picture reproducers using cathode ray tubes using separate electron beams for the primary colour signals

Definitions

  • This invention relates to color-image-reproducing apparatus of the image-projection type for color-television receivers.
  • the register of the component images projected from a plurality of cathoderay tubes to a display screen has been subject to degradation caused by variations in the anode potential supplied to the cathode-ray tubes and the focus-field intensity within the tubes.
  • Such variations may be caused, for example, by line-voltage variations affecting the anodepotential supply circuit and focus-current supply circuit of apparatus employing electromagnetic focusing or by changes or drift in component values.
  • color-image-reproducing apparatus of the image-projection type comprises a plurality of cathode-ray image-reproducing devices having individual screens for individually developing component images of a composite color image and having anode-potential output terminals and having magnetic beam-focus units which include adjustable means adjustable to provide four degrees of freedom of movement of individual ones of the aforesaid units relative to corresponding ones of the devices so that the centers of the points of impingement of the cathode-ray beams on the screens of'the devices are substantially independent of normal operating variations in anode potential and focus-field intensity within the devices.
  • the apparatus also includes optical means for projecting the component images to the display screen and means for aligning the cathode-ray devices with respect to the optical means to project the images to the display screen in 2 focus and in register for observation as a single composite color image subject to substantially no degradation of register due to normal operating variations.
  • FIG. 1 is a perspective view, partly diagrammatic, of color-image-reproducing apparatus constructed in accordance with the invention
  • FIG. 2 is a side view of a cathode-ray tube and associated beam-focus and beam-deflection units employed in the FIG. 1 apparatus;
  • FIG. 3a is a front view of a frame support for cathoderay tube and' beam-deflection windings of the FIG. 1 apparatus;
  • FIG. 3b is a fragmentary side view of the FIG. 3a support taken in section along line 3b-3b of FIG. 3a, and
  • FIGS. 4a-4c, inclusive, are diagrams utilized in explaining the operation of the apparatus.
  • color-image-reproducing apparatus constructed in accordance with the invention preferably comprises a rigid frame or central box-like structure 11 of suitable metal construction.
  • the box 11 preferably includes three faces or Walls 12, 13, 14 and an open face 15 having light-transmission apertures 16, 17, 18, 19, repectively.
  • the apparatus 10 includes a plurality of cathode-ray image-reproducing tubes 62, 61, 60 preferably having spherical tube faces coated With phosphor screens for individually developing component images, for example, red, green, and blue images, respectively, and individually mounted on rigid frames 27, 28, '29 attached to the outer surfaces 12, 13, 14 of the box 11.
  • the frames 27, 28, '29 are diagrammatically represented in broken-line construction in FIG. 1 and preferably are constructed in a unitary structure with the box 11.
  • the projector 10 also includes optical means for projecting the component images to the display screen.
  • optical means for projecting the component images to the display screen.
  • the optical means preferably also includes a plane mirror 32 having an aperture 3'3 therein for insertion in the cathode-ray tube 60 and fixedly disposed at approximately a 45 angle with respect to the axis of the cathode-ray tube.
  • the optical means also preferably includes an aspherical lens 34 of conventional type fixedly disposed in the lighttransmission aperture 18 for projecting the component image developed by tube 60 to a pair of dichroic crossedplane mirrors 20, 21 diagonally and rigidly disposed within the support 11.
  • the mirror 20 may, for example, comprise a red and green light-transmissive and blue light-reflective mirror while the mirror 21 may, for example, be a blue and green light-transmissive and red light-reflective mirror.
  • the mirrors 20, 21 are effective to translate and reflect the light incidentthereon through the open face 15 of the box 11 to a plane mirror 35 suitably disposed with respect to the apparatus 10 for reflecting component color images projected by the apparatus to a display screen 36 having suitable light-trans mission properties. 1
  • FIG. 2 there is represented a side view of-the cathode-ray tube 60 and its associated beam-focus unit 55 and deflection winding structure 54.
  • The'deflection winding 3 structure 54 is rigidly attached to a suitable mounting plate 56.
  • a beam-focus unit 55 represented as being of the electromagnetic type but which may alternatively be of the permanent magnet type, is bolted to the mounting plate 56 by means of suitable screws through a flange 57, end plate 57a, adjustable auxiliary magnetic pole piece 57b for adjusting the focus-field distribution in the unit 55, and a ring spacer 58.
  • the unit 55 houses a suitable beam-focus winding (not shown).
  • the cathode-ray tube 60 is supported at the gun end thereof by a suitable clamp 51 attached to the focus unit 55 and the bulb of the tube is firmly supported within structure 54 by suitable means (not shown).
  • An anode-potential input terminal 70 is connected to a suitable coating within the cathode-ray tube which serves as the high-voltage anode thereof.
  • the beamfocus unit 55 including its associated magnetic pole piece 57b is so disposed with respect to the cathode-ray tube 60 that the point of impingement of the cathode-ray beam on the screen of the tube is substantially independent of variations in the anode potential or focus-field intensity within the tube.
  • the tubes 62 and 61 of FIG. 1 and their associated beam-focus and deflection windings are similar in construction to the tube 60 and its associated focus unit and deflection winding.
  • the frame 29 has a section 71 which preferably is unitary with the box 11 of FIG. 1.
  • An annular support 72 shown in fragmentary view, is bolted to the section 71 by suitable screws 73a, 73b, 730 through oversize holes in the support 72 as represented in broken line.
  • a fourth screw (not shown) passes through oversize hole 79a in support 72 and hole 79b in frame section 71.
  • a screw 74 threaded in the support 72 and bearing against a flange of frame section 71 may be employed in cooperation with spring mounts 80, 80 to adjust the position of the support 72 along the axis of the screw 74 by loosening the screws 73a-73c, inclusive, and that through hole 790.
  • a similar screw 74a threaded in the support 72 and bearing against a flange of frame section 71 may be employed in cooperation with spring mounts 80a, 80a to adjust the position of support 72 along the axis of screw 74a in a similar manner.
  • an inner semiannular support 75 having a flange 75b and projecting sleeves 79 and 81.
  • the mounting plate 56 of FIG. 2 may be rigidly attached to support 75 by fastening the plate 56 of FIG. 2 under screwheads 79c, 79d, 79e of FIG. 3a onto a suitable surface plane 75a thereby mounting the beam-focus unit, deflection windings, and cathode-ray tube.
  • the support 75 is rotatably disposed with respect to the ring 72 by means of adjustable screws 76, 77, 78 in cooperation with springs 96, 97 and 98, 99, only partly apparent in FIG. 3a.
  • the screw 76 is threaded through sleeve 79 of the support 75 and bears against surface 81 of the support 72.
  • Suitable socket means may be employed to assure accurate, stable location of the screw'on the surface 81
  • Screw 78 (not shown in FIG. 3b) is mounted in a similar manner while screw 77 is threaded through a flange 72a of support 72 and bears against flange 75b of support 75.
  • Each of the screws 76, 77, 78 rocks the inner support 75 and attached beam-focus unit, cathode-ray tube, and deflection windings about an axis passing through the pivot points of the other two screws.
  • the frame 29 and its counterparts, frames 27 and 28, serve, therefore, as means for aligning the cathode-ray tubes with respect to the optical means to project the component images to the display screen in focus and in register for observation as a single composite color image subject to substantially no deg-. radation of register due to normal operating variations of the anode potential or focus-field intensity within the tubes.
  • means for adjusting the cathode-ray tubes and the beam-focus units, with the faces of the cathode-ray tubes displaceable about the centers of curvature of the faces to maintain the images in focus as projected to the display screen, while providing a register adjustment comprises the support 75, screws 76, 77, 78 and associated springs, and similar elements in frames 27 and 28 of FIG. 1, as will be more fully explained subsequently.
  • the pivot ends of screws 76 and 78 define a line intersecting the optical axis of the optical system associated with frame 29 at the point at which the center of curvature of the picture tube screen should lie.
  • the individual beam-focus units should first be so adjusted with respect to the cathode-ray tubes that the centers of the points of impingement of the cathode-ray beams on the tube screens are substantially independent of variations in the anode potential or focus-field intensity within the tubes. This may be accomplished by applying anode potential and focus current to a given cathode-ray tube and focus winding without applying line-scan and field-scan signals to the associated deflection winding so that an undeflected light spot is formed by the cathoderay beam on the face of the tube.
  • the anode potential or the focus current may then be varied. It will ordinarily be found that the light spot on the tube face moves in response to such variation of the electricor magnetic-field intensity.
  • the magnetic pole piece 57b of beam-focus unit 55 of FIG. 2 may then be repositioned with respect to the cathode-ray tube 60, causing the light spot to move to a different position on the face of the tube.
  • the electron gun shoots the cathoderay beam to the center of the tube face along the axis of the effective magnetic lens formed by the focus field and if the focus field is uniformly distributed, the displacement of the light spot on the tube face will be 'insen sitive to variations in the electricor magnetic-field intensity within the tube.
  • the position of zero displacement of the light spot may occur awayfrom the center of the tube face because the electron gun axis does not ordinarily pass precisely through the center of the tube face and because the position of the focus-unit body may be misaligned initially.
  • the location of the spot for zero displacement in response to voltage variations may be made to occur over a wide range of positions on the face of the tube. Some of these positions are near the center of the tube face.
  • the four degrees of freedom are provided in the FIG. 2 apparatus by lateral displacements of the body of the focus unit 55 and by displacements of the pole piece 57b and by tilting of the tube neck within the focus field.
  • the body of the focus unit 55 may be shifted relative to the tube and the magnetic pole piece may then be readjusted to cause the position of the spot for zero displacement to occur near the center of the tube face.
  • the tubes and associated units may be bolted to the frame sections 27, 28, 29' of FIG. 1.
  • Line-scan and fieldscan deflection voltages may then be applied to the linescan and field-scan windings associated with the tubes to develop image rasters.
  • a suitable video signal may also be applied to the input terminals of the tubes so that the tuba may be readily aligned to project images to the display screen in focus and in register as a single composite color image which is subject to substantially no degradation of register under normal operating variations of the electricor magnetic-field intensity.
  • the adjustment of register of the three cathode-ray tubes may be understood by considering the positioning of the cathode-ray tube 60 accomplished on the support 29 with reference to FIG. 4a.
  • the image raster on the tube face will be in focus on the display screen 36 of FIG. 1 when the spherical tube face lies along an imaginary focal surface, represented by broken line 93, having the same center of curvature 94 as the tube face when properly positioned and the spherical mirror 30. It may be found, however, upon initially inserting the tube in the unit 29 that the tube face assumes a position represented in FIG. 4a in broken-line construction.
  • the position of the tube may be altered to that represented in FIG. 4b.
  • the tube By adjusting screws 76, 77, and 78, if necessary, the tube may be positioned as indicated in FIG. 40 with its face in the focal surface. Then, by adjusting screw 78, the face of the tube may be moved in the focal surface in a first direction and, by differentially adjusting screws 76 and 77, the face of the tube may be moved in the focal surface in a direction normal to the first direction on the spherical surface.
  • the raster on the face of the tube may be registered with the rasters of the other tubes as projected to the display screen while maintaining the optical focus of the projected images since an image anywhere on the focal surface is projected in focus to the display screen.
  • color-image-reproducing apparatus of the image-projection type constructed in accordance with the invention, has the advantage that the image register is substantially independent of variations of the anode potential or focusfield intensity encountered under normal operating conditions.
  • the apparatus has the further advantage that circuits associated therewith are less complex and costly than those previously employed because a high degree of regulation of the anode potential or focus-field intensity is rendered unnecessary.
  • color-image-reproducing apparatus of the imageprojection type comprising: a plurality of cathode-ray image-reproducing devices having individual screens for individually developing component images of a composite color image and having anode-potential input terminals and having magnetic beam-focus units which include adjustable means adjustable to provide four degrees of freedom of movement of individual ones of said units relative to corresponding ones of said devices so that the centers of the points of impingement of the cathode-ray beams on said screens of said devices are substantially independent of normal operating variations in the anode potential and focus-field intensity within said devices; optical means for projecting said component images to the display screen; and means for aligning said cathode-ray devices with respect to said optical means to project said images to the display screen in focus and in register for observation as a single composite color image subject to substantially no degradation of register due to normal operatin g variations.
  • color-image-reproducing apparatus of the imageprojection type comprising: a plurality of cathode-ray image-reproducing devices having individual phosphor screens for individually developing component images of a composite color image and having electrical potential input terminals and having magnetic beam-focus units, said units including means adjustable to provide for the rotation of said units about two mutually perpendicular axes which are both perpendicular to the axis of the device thereof and further including means adjustable to provide translation of said units along said two mutually perpendicular axes, so that the centers of the points of impingement of the cathode-ray beams on said screens of said devices are substantially independent of normal operating variations in the electricand magnetic-field intensity within said devices; optical means for projecting said component images to the display screen; and means for aligning said cathode-ray devices with respect to said optical means to project said images to the display screen in focus and' in register for observation as a single composite color image subject to substantially no degradation of register due
  • color-image-reproducing apparatus of the projection type comprising: three cathode-ray tubes having spherical faces for individually developing component images of three different colors and having anode-potential supply terminals and having magnetic beam-focus units which include adjustable means adjustable to provide four degrees of freedom of movement of individual ones of said units relative to corresponding ones of said tubes so that the centers of the points of impingement of the cathode-ray beams on the tube faces are substantially independent of normal operating variations in the anode potential and focus-field intensity within the tubes and that said developed images are substantially centered on said tube faces; optical means including spherical mirrors dis posed opposite the faces of said cathode-ray tubes and including aspherical correction lenses for projecting said images to the display screen; and means for adjusting said cathode-ray tubes and beam-focus units with said faces of said cathode-ray tubes displaceable about the centers of curvature of said faces to maintain said images in focus as projected to the display

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
US498918A 1955-04-04 1955-04-04 Color-image-reproducing apparatus of the image-projection type Expired - Lifetime US3009015A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
NL205895D NL205895A (enrdf_load_stackoverflow) 1955-04-04
BE546721D BE546721A (enrdf_load_stackoverflow) 1955-04-04
US498918A US3009015A (en) 1955-04-04 1955-04-04 Color-image-reproducing apparatus of the image-projection type
GB7648/56A GB784570A (en) 1955-04-04 1956-03-12 Color-television image-reproducing apparatus of the image-projection type
DEH26655A DE1064099B (de) 1955-04-04 1956-03-28 Projektions-Farbfernsehempfaenger
CH338865D CH338865A (de) 1955-04-04 1956-03-29 Projektions-Farbfernsehempfänger
FR1148979D FR1148979A (fr) 1955-04-04 1956-04-04 Récepteur de télévision en couleurs pour la projection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US498918A US3009015A (en) 1955-04-04 1955-04-04 Color-image-reproducing apparatus of the image-projection type

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Publication Number Publication Date
US3009015A true US3009015A (en) 1961-11-14

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US498918A Expired - Lifetime US3009015A (en) 1955-04-04 1955-04-04 Color-image-reproducing apparatus of the image-projection type

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US (1) US3009015A (enrdf_load_stackoverflow)
BE (1) BE546721A (enrdf_load_stackoverflow)
CH (1) CH338865A (enrdf_load_stackoverflow)
DE (1) DE1064099B (enrdf_load_stackoverflow)
FR (1) FR1148979A (enrdf_load_stackoverflow)
GB (1) GB784570A (enrdf_load_stackoverflow)
NL (1) NL205895A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4432011A (en) * 1982-02-19 1984-02-14 Zenith Radio Corporation Method for optical alignment of a projection television system
US4473840A (en) * 1981-01-08 1984-09-25 Matsushita Electric Industrial Co., Ltd. Optical focus adjustment means for projection television apparatus
US11744413B2 (en) 2021-10-07 2023-09-05 Deb Ip Limited Dispenser assembly

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2549585A (en) * 1947-04-29 1951-04-17 Rca Corp Multiple television projector
US2568631A (en) * 1950-01-27 1951-09-18 Admiral Corp Focus coil support and control

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL67613C (enrdf_load_stackoverflow) * 1945-11-21 1951-02-28
BE491813A (enrdf_load_stackoverflow) * 1948-10-26

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2549585A (en) * 1947-04-29 1951-04-17 Rca Corp Multiple television projector
US2568631A (en) * 1950-01-27 1951-09-18 Admiral Corp Focus coil support and control

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4473840A (en) * 1981-01-08 1984-09-25 Matsushita Electric Industrial Co., Ltd. Optical focus adjustment means for projection television apparatus
US4432011A (en) * 1982-02-19 1984-02-14 Zenith Radio Corporation Method for optical alignment of a projection television system
US11744413B2 (en) 2021-10-07 2023-09-05 Deb Ip Limited Dispenser assembly

Also Published As

Publication number Publication date
CH338865A (de) 1959-06-15
NL205895A (enrdf_load_stackoverflow)
FR1148979A (fr) 1957-12-18
GB784570A (en) 1957-10-09
DE1064099B (de) 1959-08-27
BE546721A (enrdf_load_stackoverflow)

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