• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    1487000 Luminescent screens RCA CORPORATION 3 Dec 1975 [6 Dec 1974] 49705/75 Heading H1D In the lighthouse method of preparing a mosaic viewing screen on a C.R.T. faceplate panel 72 wherein a light-hardenable layer 75 on the faceplate is exposed to light projected through an apertured mask 77 which is supported by temperature-compensating mountings 80 on the panel, the mountings 80 are cooled during the light exposure. To effect this cooling a length of plastics tubing 81 extends around the inside wall of the panel support 23 and is connected to a source of compressed air and provided with holes 83 opposite each bimetal portion of the mountings 80. During the light exposure step the panel 72 is at a temperature above 40‹ C. and the stream of cooling air is effective to reduce the temperature of the mounting 80 to below 25 ‹C. The shadow mask 77 itself may also be similarly cooled by an air stream, and the rate at which cooling air is supplied may be different across the assembly to overcome local heating differentials, e.g. due to the higher side of the tilted assembly heating faster than the lower side.
    公开号:SU1281181A3
    申请号:SU752195855
    申请日:1975-12-04
    公开日:1986-12-30
    发明作者:Венделл Брэнтон Том
    申请人:Рка Корпорейшн (Фирма)；
    IPC主号:
    专利说明:

    This invention relates to a direct photographic method of manufacturing a screen for a cathode ray tube with a shadow mask.
    The aim of the invention is to reduce production time while maintaining image quality by reducing the effects of distortion due to thermal radiation from the front glass.
    FIG. 1 - a projection lamp for carrying out the method (the screen unit is installed on the lamp in the position for exposure), a partial section; in fig. 2 is a diagram of the passage of light rays caused by thermal energy movements in the screen of the node.
    Example. The printing method of the phosphor elements of the screen for a 43-centimeter with a deflection angle of 90 ° cathode ray tube with a shadow mask for a television receiver.
    In the manufacture of the tube, the faceplate assembly is assembled as an assembly unit. Screen node 1 (Fig. 1) contains the front glass 2 and the node 3 of the shadow mask installed in it.
    The front glass 2 includes a screen glass 4 and side walls 5. The mask unit 3 includes a shadow mask 6 having a plurality of holes 7. The mask 6 is attached along the edges to the frame 8, to which the mounting means 9 are attached in three spaced locations. Each installation means 9 contains bimetallic and spring parts. The bimetallic part is adapted to adjust the gap between the mask 6 and the inner surface of the screen glass 4 depending on the temperature change of the mask unit 3.
    Node 1 contains a light-hardened layer 10 on the inner surface of glass 4, for example, comprising green phosphor particles, polyvinyl alcohol and a bichromate photosensitizer for alcohol.
    Projection lamp 11 contains a box 12 for a light source and a support 13 for ectane glass.
    A light guide 14 (collimator) in the form of a conical glass rod is installed in the box. The narrow end of the light guide 14 - is a light source with a small surface in the projection lamp. Wider horse
    the light guide 14 is fixed in front of the ultraviolet radiation lamp. The upward path of the light emitted by the light guide 14 usually blocks the dimmer 15, but if it is necessary to expose the coating of the layer 10 on the glass 4, the dimmer 15 can be moved away from the path of the light.
    A 1/4 inch plastic pipe 16 passes through the inner wall of the faceplate support 13. Both ends of the pipe end in two taps of a metal tee (not shown) on the higher side of the inclined support 13. The third tee outlet is connected to a compressed air source. Air is supplied to the skin, for example, continuously or only after removal of the dimmer 15 from the light guide 14. In the pipe 16, holes 17 are made in front of each bimetallic part of the mounting means 9 for the mask.
    The inner surface of the glass 4 is covered with a layer of a material 10 hardened by light, for example, a layer of a suspension containing water, particles of green phosphor, polyvinyl alcohol and ammonium dichromate. Glass 2 and layer 10 are heated to dry the layer 10. The heating temperature can be up to 85 ° C. After drying, when the glass 2 still has a temperature above 40 ° C, usually about 45-50 ° C, a mask unit 3 is inserted into it that has a room temperature. The temperature of the mounting means 9 rises above 40 ° C due to the radiation of heat from a relatively large mass of glass 2 and especially the side walls 5. The temperature of the mask 6 and frame 8 also increases due to radiation from glass 2. Increasing the temperature of the mounting means 9 causes the mask to move in the direction to screen glass 4.
    权利要求:
    Claims (1)
    [1]
    The front glass 2 with the mask unit 3 installed therein is placed on the support 13 in the lantern 11, as shown in FIG. 1. Dimmer 15 retracts from the light path, allowing light from the source to pass upward through the lens system and then fall through the mask through the holes in the mask 10. After dimming the dimmer path 15c, the compressed air flows into and out of the tube at room temperature 16 - through the holes 17, to form a stream of cooling air. blowing installation means 9 The cooling air lowers the temperature of the installation means 9 below 25 ° C, although mask 6 and frame 8 for mi may have a higher temperature. Cooling the installation means causes the mask 6 to move in the direction away from the glass 4. FIG. 2 schematically shows the light rays from the narrow end of the light water 14, passing through the offset 7 in the mask and feeding to the layer 10, as a result of which R becomes insoluble under the action of light. The mask 6 is located at a distance q from the inner glass surfaces 4. Without the use of cooling air, the installation means, being means with temperature compensation and having a temperature much higher than 25 ° C, would hold the mask 6 close to glass 4 (at a distance q). At this position of the mask, the section R, laterally displaced inwards along layer 10, would become insoluble. During the subsequent assembly of the pipe, the screen section R would not be positioned properly relative to the opening 7 in the mask, whereas R would be located correctly. After the layer 10 is exposed, the light from the source is shut off and the air supply to the pipe 16 is stopped. Then the unit 1 is removed from the lamp 11, the unit 3 of the mask and the layer 10 is removed from the glass 2, the coating is washed with a solvent. The unexposed portions of layer 10 are washed away with a solvent, and the exposed portions with green phosphor particles remain in place. As mentioned above, mask 6 can be heated by heat emitted from glass 4, above 40 - 50 s. Usually, mask 6, having a relatively small mask, heats up faster than frame 8, which has a relatively large mass. As a result of the difference in heating rates, the mask usually swells due to the difference in size changes due to different heating rates. The swelling causes the mask areas to move in the direction of the glass 4. To reduce the swelling of the mask 6, jets or several streams of cooling air are directed to its inner surface, for example, at room temperature to cool the mask below 25 ° C. This can be achieved by using a pipe 16 or another pipe adjacent to the pipe 16 and having a hole adapted to exhaust air on the mask 6. Due to the inclination of the support 13 for the faceplate in the lamp at an angle to the horizontal plane, the heat tends to be concentrated at the higher side the glasses 2, as a result of which the mask 6, the frame 8 for the mask and the installation means 9 are heated on a higher side faster than on the lower side. The difference in heating rates between the outgoing and reduced sides of the node 1 can cause distortion, warping or local swelling of the node 3 of the mask. This can be prevented by introducing cooling air or other cooling means with a higher rate of discharge on the return side of the faceplate than on the lowered one. The cooling pattern can be matched over the entire surface of the mask assembly to prevent differences in heating rate in certain locations of the assembly. Formula of the invention shading mask mounted on the side walls of the front glass using temperature compensating installation means, including the operation of coating the inner surface of the screen glass in the form of a layer containing light hardening material to heat the front glass to dry the coating; into the heated front glass and exposing the coating to the light projected through the shadow mask. while cooling the front glass. distinguished by the fact that, in order to reduce production time while improving the image quality,
    类似技术:
    公开号 | 公开日 | 专利标题
    SU1281181A3|1986-12-30|Method of manufacturing phosphor dot array for cathode-ray tube
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    US4132470A|1979-01-02|Exposure device for the manufacture of display screens of color television display tubes and display tube manufactured by means of such a device
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    同族专利:
    公开号 | 公开日
    FR2293789A1|1976-07-02|
    GB1487000A|1977-09-28|
    BR7507996A|1976-09-08|
    MX2994E|1980-01-23|
    NL7514233A|1976-06-09|
    ZA757527B|1976-11-24|
    ES443098A1|1977-04-16|
    PL113424B1|1980-12-31|
    CA1044748A|1978-12-19|
    US3970456A|1976-07-20|
    NL182262C|1988-02-01|
    DE2554879C2|1986-03-27|
    AU499503B2|1979-04-26|
    NL182262B|1987-09-01|
    BE836241A|1976-04-01|
    AU8701875A|1977-06-02|
    JPS5758014B2|1982-12-07|
    DE2554879A1|1976-06-10|
    JPS5183472A|1976-07-22|
    FR2293789B1|1980-01-04|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3406068A|1951-07-30|1968-10-15|Rca Corp|Photographic methods of making electron-sensitive mosaic screens|
    US3399919A|1965-03-18|1968-09-03|David L. Brunt|Pneumatically cushioned bumper|
    US3330980A|1965-07-16|1967-07-11|Rca Corp|Shadow mask mounted with bi-metallic sections connected by expansible loop|
    US3524973A|1968-08-13|1970-08-18|Sylvania Electric Prod|Shadow mask supporting structure having thermal expansion correction means|
    GB1309696A|1969-03-19|1973-03-14|Matsushita Electronics Corp|Shadow mask support means for a colour television image tube|
    US3621318A|1970-04-27|1971-11-16|Admiral Corp|Color television picture tube with metallic film coating on funnel portion|
    US3873875A|1970-08-05|1975-03-25|Gte Sylvania Inc|Temperature compensating parallax barrier supporting system for color cathode ray tubes|
    US3700949A|1971-01-21|1972-10-24|Nippon Electric Co|Color television picture tube|
    US3685994A|1971-05-05|1972-08-22|Rca Corp|Photographic method for printing a screen structure for a cathode-ray tube|US4562120A|1984-08-10|1985-12-31|Rca Corporation|Heat-resistant, optically-black coating|
    US4584481A|1984-11-13|1986-04-22|Rca Corporation|Method of testing a panel assembly of a color cathode-ray tube|
    JPH081782B2|1986-01-31|1996-01-10|株式会社東芝|Color cathode ray tube manufacturing equipment|
    US4812485A|1987-02-12|1989-03-14|Rca Licensing Corporation|Ultraviolet-resistant noise-reducing member and method of making same|
    JPH0787077B2|1988-04-13|1995-09-20|三菱電機株式会社|In-line type shadow mask type color cathode ray tube exposure device|
    US4994712A|1989-05-03|1991-02-19|Zenith Electronics Corporation|Foil shadow mask mounting with low thermal expansion coefficient|
    KR20000069347A|1997-10-08|2000-11-25|요트.게.아. 롤페즈|Method of manufacturing a display device|
    US20030036330A1|1997-10-08|2003-02-20|Hans Galenkamp|Method of manufacturing a display device|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US05/530,404|US3970456A|1974-12-06|1974-12-06|Method for preparing a viewing-screen structure for a CRT having temperature-compensated mask-mounting means, including cooling mask during exposure|
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