Apparatus with changeover grooves for forming phosphor layer in cathode-ray tube

{
  "publication_number": "US5259877A",
  "country": "US",
  "kind": "A",
  "title": "Apparatus with changeover grooves for forming phosphor layer in cathode-ray tube",
  "abstract": "An apparatus for forming phosphor layers in cathode-ray tubes includes a table having a plurality of operating positions for processing panels for cathode-ray tubes to coat phosphor layers thereon. A plurality of angularly spaced clamp heads for holding the panels, respectively, are supported on the table for rotation about a first axis and angular movement about a second axis in each of the operating positions. A cam, which is operatively connected to the clamp heads, has a first cam groove for angularly moving the clamp heads through different angles about the second axis in the operating positions and a second cam groove for keeping the clamp heads in a fixed angular position with respect to the second axis in the operating positions. Joint cam groove mechanisms are combined with the cam for selectively switching between the first and second cam grooves.",
  "claims": [
    "1. An apparatus for forming phosphor layers in cathode-ray tubes, comprising: a table having a plurality of operating positions for processing panels for cathode-ray tubes to coat phosphor layers thereon; a plurality of angularly spaced clamp heads for holding the panels, respectively, said clamp heads being supported on said table for rotation about a first axis and angular movement about a second axis in each of said operating positions; a cam operatively connected to said clamp heads, said cam having a first means, including a first cam groove, for angularly moving said clamp heads through different angles about said second axis in said operating positions, a second means, including a second cam groove, for keeping said clamp heads in a fixed angular position with respect to said second axis in said operating positions and a cam element operatively connected to each of said clamp heads for engaging and following said cam grooves; and means combined with said cam, for selectively switching said cam elements between said first and second cam grooves.",
    "2. An apparatus according to claim 1, wherein said cam elements each comprises a cam roller rollingly engaging in one of said first and second cam grooves at a time, and a cam plate, said first cam groove being defined in said cam plate and having an undulating annular configuration, said second cam groove being defined in said cam plate in radially spaced relationship to said first cam groove and having a circular configuration.",
    "3. An apparatus according to claim 2, wherein said selective switching means comprises a cam groove mechanism disposed in said cam place across said first and second cam grooves, said cam groove mechanism having a cam groove for receiving said cam roller, said cam groove of the cam groove mechanism being movable from a position aligned with said first cam groove to a position aligned with said second cam groove.",
    "4. An apparatus for forming phosphor layers in cathode-ray tubes, comprising: a table having a plurality of operating positions for processing panels for cathode-ray tubes to coat phosphor layers thereon; a plurality of angularly spaced clamp heads for holding the panels, respectively, said clamp heads being supported on said table for rotation about a first axis and angular movement about a second axis in each of said operating positions; a cam operatively connected to said clamp heads, said cam having a first cam groove for angularly moving said clamp heads through different angles about said second axis in said operating positions, a second cam groove for keeping said clamp heads in a fixed angular position with respect to said second axis in said operating positions and a cam element operatively connected to each of said cam heads for engaging and following said cam grooves; and means combined with said cam, for selectively switching said cam elements between said first and second cam grooves; wherein said cam elements each comprises a cam roller rollingly engaging in one of said first and second cam grooves at a time, and a cam plate, said first cam groove being defined in said cam plate and having an undulating annular configuration, said second cam groove being defined in said cam plate in radially spaced relationship to said first cam groove and having a circular configuration; said selective switching means comprises a cam groove mechanism disposed in said cam plate across said first and second cam grooves, said cam groove mechanism having a cam groove for receiving said cam roller, said cam groove of the cam groove mechanism being movable from a position aligned with said first cam groove to a position aligned with said second cam groove; and wherein said cam groove mechanism comprises a pair of drive rollers, an endless belt trained around said drive rollers, and an array of cam plate members supported on said endless belt, each of said cam plate members having said cam groove."
  ],
  "description_excerpt": "1. Field of the Invention\n\nThe present invention relates to an apparatus for forming phosphor layers in cathode-ray tubes such as color cathode-ray tubes.\n\n2. Description of the Prior Art\n\nPhosphor layers in color cathode-ray tubes, e.g., stripe-type color phosphor layers comprising red, green, and blue phosphor stripes and black stripes (light absorbing layer) formed between the red, green, and blue phosphor stripes, are produced as follows: First, a photosensitive film of PVA (polyvinyl alcohol) is coated on the inner surface of the front panel of a cathode-ray tube. After the coated photosensitive film is dried, it is exposed to an ultraviolet radiation using color selecting electrode as an optical mask. The exposed photosensitive film is then developed by being washed with water, producing stripe-shaped resist layers corresponding in position to the respective colors. The entire panel surface including the resist layers is coated with a carbon slurry. The resist layers and the carbon layer thereon are then lifted off, providing carbon stripes, i.e., black stripes, in a given pattern. Then, the panel surface is coated with a green phosphor slurry. After the coated slurry is dried, it is exposed through the color selecting electrodes. The exposed slurry is developed, forming green phosphor stripes between the carbon stripes. Similarly, blue and red phosphor stripes are thereafter formed between the other carbon stripes. Subsequently, the stripes thus formed are coated with an intermediate film and then a metal backing layer of Al, thus producing a color phosphor layer.",
  "cpc": [
    "H01J 9/2272",
    "H01J 9/227",
    "Y10T 74/18288",
    "Y10T 74/2101"
  ],
  "ipc": [
    "H01J 9/22",
    "H01J 9/227",
    "H01J 9/24",
    "H01J 9/46"
  ],
  "assignees": [
    "Sony Corp"
  ],
  "inventors": [
    "Mitsuru Ozaki"
  ],
  "filing_date": "1992-03-12",
  "publication_date": "1993-11-09",
  "grant_date": "1993-11-09",
  "priority_date": "1991-03-19",
  "application_number": "US-85004092-A",
  "family_id": "12981505",
  "cited_by_count": 5,
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}