Transparent plate, process for the production thereof and their applied screen display plate, and cathode ray tube and process for the production thereof

• US 5,880,557 A
• Filed: 03/17/1997
• Issued: 03/09/1999
• Est. Priority Date: 09/09/1988
• Status: Expired due to Term

• Current Assignee: Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Hitachi, Ltd.
• Inventors: Ono, Masahiko, Yamada, Toshihiro, Araya, Takeshi, Endo, Yoshishige, Kobara, Katsumi, Kawamura, Takao, Kawamura, Hiromitsu
• Primary Examiner(s): Patel, Ashok
• Assistant Examiner(s): HAYNES, MACK NELSON
• Application Number:
  US08/818,428
• Time in Patent Office: 722 Days
• Field of Search: 313/110, 313/112, 313/113, 313/474, 313/477 R, 313/478-79, 313/461, 313/466, 252/518, 75/233, 358/252, 359/601, 106/286.4, 106/286.8, 106/286.1, 106/287.19, 106/287.34, 106/459, 106/481, 428/323, 428/325, 428/331, 428/404, 428/426, 428/428, 428/429, 428/446, 428/702, 428/206, 428/210, 428/212, 428/307.3, 428/402, 428/386-87
• US Class Current: 313/461
• CPC Class Codes: C03C 17/007 containing a dispersed phase, e.g. particles, fibres or flakes, in a continuous phase
• CPC Class Codes: C03C 2217/42 consisting of particles only
• CPC Class Codes: G02B 1/11 Anti-reflection coatings
• CPC Class Codes: H01J 29/868 Screens covering the input or output face of the vessel, e.g. transparent anti-static coatings, X-ray absorbing layers
• CPC Class Codes: H01J 29/896 Anti-reflection means, e.g. eliminating glare due to ambient light
• CPC Class Codes: H01J 9/20 Manufacture of screens on or from which an image or pattern is formed, picked up, converted or stored; Applying coatings to the vessel
• CPC Class Codes: Y10T 428/24893 including particulate material
• CPC Class Codes: Y10T 428/249956 Void-containing component is inorganic
• CPC Class Codes: Y10T 428/25 Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
• CPC Class Codes: Y10T 428/259 Silicic material
• CPC Class Codes: Y10T 428/2982 Particulate matter [e.g., sphere, flake, etc.]

Abstract

Disclosed are an ultrafine particle film which is effective for the prevention of an electrostatic charge and reflection and can be applied to a large area at a low cost, a cathode ray tube to which the ultrafine particle film is applied, and image display plate to which the ultrafine particles is applied, and a process for producing the ultrafine particle film which comprises attaching a coating solution bath to a Braun tube surface and the like, introducing a containing solution containing anti-reflection SiO₂ ultrafine particles and antistatic SnO₂ ultrafine particles, and elevating up or down on the Braun tube surface and the like at a constant rate.

Claims

1. An image display having an image display plate comprising a transparent base plate, a film containing ultrafine particles provided thereon, and a binder, said ultrafine particles comprising substantially spherical ultrafine particles, each of which having been treated to have an uneven surface so as to provide the image display plate with an anti-reflection function and high resolution, wherein said substantially spherical ultrafine particles having an uneven surface have an average diameter of not more than 100 nm and have pores formed substantially uniformly on their surface, said pores forming said uneven surface.

2. An image display according to claim 1, wherein said substantially spherical ultrafine particles have a porosity of about 50%.

3. An image display according to claim 1, wherein a diameter of each of said pores is not more than 50 nm.

4. An image display having an image display plate comprising a transparent base plate, a film containing ultrafine particles provided thereon, and a binder, said ultrafine particles comprising substantially spherical ultrafine particles, each of which having been treated to have an uneven surface so as to provide the image display plate with an anti-reflection function and high resolution, wherein each of said substantially spherical ultrafine particles having an uneven surface comprises an aggregate of particles made of the same material, each aggregate having an average particle diameter of not more than 0.2 μ

m, gaps between the particles forming said uneven surface.

5. An image display according to claim 4, wherein said aggregate comprise a plurality of particles having a diameter of not more than 50 nm.

6. An image display according to claim 4, wherein said aggregate comprise a plurality of particles having a diameter of not more than 50 nm.

7. An image display comprising an image display plate comprising a transparent base plate, a film containing ultrafine particles provided thereon, and a binder, said ultrafine particles comprising substantially spherical ultrafine particles, each of said substantially spherical ultrafine particles having been treated to have an uneven surface so as to provide the image display plate with an anti-reflection function and high resolution, wherein each of said substantially spherical ultrafine particles comprises an aggregate of particles, wherein each aggregate comprises a first particle having an average particle diameter of 100 to 150 nm and a plurality of second, smaller particles adsorbed on a surface thereof, wherein said second, smaller particles are electrically conductive.

8. An image display according to claim 7, wherein said second smaller particles are made of a material selected from the group consisting of SnO₂, Sb₂ O₃ and In₂ O₃.

9. An image display according to claim 8, wherein said second, smaller particles have an average particle diameter not more than 1/10 of the average particle diameter of said first particle.

10. An image display according to claim 9, wherein said first particle is made of at least one material selected from the group consisting of SiO₂ and MgF₂.