 Method of forming a hydrophilic coating on an aluminum surface |
| OF THE INVENTION It has been found that the best results for a hydrophilic coating are obtained ... |
|
| Vortex diodes |
| The present invention seeks to improve upon existing known vortex diodes by paying particular ... |
|
| Apparatus for monitoring feed of granular material |
| I claim: 1. Apparatus used in combination with electronic equipment to monitor the depth of ... |
|
| Valve for a gas cylinder or the like |
| I claim: 1. Valve for gas cylinder or the like, comprising: a valve body including a seat an inlet ... |
|
| Dynamic double action valve |
| It is the object of this invention to have a valve in which a small angular rotation of the handle ... |
|
| Valve assembly and disassembly device |
| Accordingly, one object of this invention is to provide a novel valve assembly and disassembly ... |
|
| Gate valve |
| According to the present invention and forming primary objectives thereof, a gate valve is provided ... |
|
| Valve for controlling liquid flow |
| We claim: 1. A valve for controlling the fluid flow from an inlet of a closed valve housing to an ... |
|
| Solenoid actuator with bleed screw |
| OF THE SHOWN EMBODIMENT Referring to the drawing more particularly by reference numbers, number 10 ... |
|
| Photoelectric single handle faucet |
| This invention relates to an interior mechanism for a faucet suitable for basin, bath tub, and ... |
|
|
Method of manufacturing color picture tubes
| Details |
Inventors: Matsuzaki, Osamu; Abe, Michio; Mitobe, Koichi; Tanno, Seikichi;
Assignee: Hitachi, Ltd. (Tokyo, JP)
Primary Examiner: Smith; Ronald H.
Assistant Examiner: Bueker; Richard
Attorney, Agent or Firm: Pfund; Charles E.
In a method of manufacturing a color picture tube of the type comprising the steps of coating phosphors of three primary colors on the inner surface of the face plate of the color picture tube to form dots or stripes of the phosphors, applying an acrylic resin emulsion on the dots or stripes of the phosphors to form an acrylic resin film, vapor depositing metal onto the film to form a metallic reflecting film, subjecting the acrylic resin film to a pyrolysis for decomposing it into gases, and removing the gases, the acrylic resin emulsion comprises a plurality of emulsions respectively containing conventional acrylic resin and normal butyl methacrylate resin. The normal butyl methacrylate resin is mixed with the conventional acrylic resin at a ratio of 5 to 40% by weight. According to this method, it is possible to prevent bulging of the metallic reflecting film during baking step while minimizing the number of the pin holes and cracks of the metallic reflecting film so as not to decrease the brightness of the reproduced picture. |
|
DETAILED DESCRIPTION It is an object of this invention to provide an improved method of manufacturing a colour picture tube utilizing an improved film forming method which can prevent bulging of a metallic reflecting film during baking step while minimizing the number of pin holes so as not to decrease the brightness of the reproduced picture.
To attain the above object, this invention takes advantage of the fact that when the number of pin holes in the metallic reflecting film is constant, that is, the gas permeability of the film is constant, the bulge of the metallic reflecting film tends to grow in proportion to the quantity of gases given off by the organic substance of the acrylic resin per unit time, especially, to the peak value of that quantity because a large amount of gases resulting from the pyrolysis is forced to pass through the fixed number of pin holes.
Thus, in this invention, a plurality of acrylic resins having different pyrolysis characteristics are chosen and mixed such that the pyrolysis is carried out with a relatively low peak value.
According to this invention, there is provided a method of manufacturing a colour picture tube of the type comprising the steps of coating phosphors of three primary colours on the inner surface of the face plate of the colour picture tube to form dots or stripes of the phosphors, applying an acrylic resin emulsion on the dots or stripes of the phosphors to form an acrylic resin film, vapour depositing metal onto the film to form a metallic reflecting film, subjecting the acrylic resin film to a pyrolysis for decomposing it into gases, and removing the gases, wherein the acrylic resin emulsion comprises a mixture of a plurality of emulsions containing different acrylic resins having different pyrolysis characteristics.
Preferred acrylic resins are conventional acrylic resin and normal butyl methacrylate resin and the film forming emulsion contains the normal butyl methacrylate resin mixed with the conventional acrylic resin at a ratio of 5 to 40% by weight
|
| Related patents |
|
|
Method of forming a fluorescent screen for cathode-ray tube
Accordingly, an object of the present invention is to eliminate the aforementioned drawbacks and to provide a method of forming a fluorescent screen for a cathode-ray ...
|
|
|
Display tube having printed copolymer film layer
I claim as my invention: 1. A display tube including a phosphor layer, a printed film layer overlying said phosphor layer, and a metal backing layer overlying said film ...
|
|
|
Method for the metallization of a luminescent screen
What is claimed is: 1. A method for the metallization of a luminescent screen comprising the following steps: depositing a layer of at least one luminophor containing a ...
|
|
|
Phosphor paste compositions and phosphor coatings obtained therefrom
OF THE PREFERRED EMBODIMENTS An acrylic polymer is preferred as the organic resin binder for the phosphor paste composition according to this invention, although a ...
|
|
|
Process of fabricating field-emission type electron source, electron source fabricated thereby and element structure of electron source
The present invention has been achieved to solve the above conventional problems, and it is therefore an object of the present invention to provide a process of ...
|
|
|
Tungsten-fluorine lamp with native retained oxygen therein and method of manufacture
The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows: 1. A tungsten halogen lamp comprising a glass bulb having ...
|
|
|
Electric lamps and their production
I claim: 1. An electrical discharge lamp comprising a lamp envelope, electrodes and leads therefor and a vapour fill including metal halide and a quantity of phosphorus ...
|
|
|
Getter device
It is, therefore, the primary object of the present invention to provide a getter device which has resistance to oxidation at high temperatures, which is capable of ...
|
|
|
Electric lamp including oxygen getter
We claim: 1. An electric incandescent lamp having a closed envelope, said envelope containing a filament mounted therein; and a gaseous oxygen getter within said ...
|
|
|
Raft inflation valve
OF THE INVENTION FIG. 1 is an exploded perspective view of a valve assembly 10. FIG. 2 is a cross-sectional view of valve assembly 10 installed in a conventional ...
|
|
|
Metal Working 
