JPH0745187A - Manufacture of color cathode-ray tube - Google Patents

Abstract

PURPOSE:To reduce failure in a matrix developing process in a fluorescent screen forming line of a color cathode-ray tube. CONSTITUTION:In a fluorescent screen forming line of a color cathode-ray tube, a wet process to damp a developed fluorescent screen by water sprayed from a spray nozzle 3 is arranged between an exposure process to print the fluorescent screen on a panel 1 in a prescribed matrix and a developing process to carry out matrix developing by high water pressure. Since matrix breakdown in the developing process can be prevented by this wet process, a defective can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a color cathode ray tube, and more particularly to a method for forming a fluorescent film on the color cathode ray tube.

[0002]

2. Description of the Related Art Conventionally, green, blue, and red phosphor screens of color cathode ray tubes are coated with phosphor slurry on the inner surface of a faceplate of a cathode ray tube panel, dried with far infrared rays or warm air, and then through a shadow mask. After exposing the matrix, it was made by spraying high-pressure water or warm water on the as-dried fluorescent film, washing away the unnecessary film on the matrix and developing it three times for green, blue, and red. .

[0003]

In the conventional fluorescent film forming process, in the process from exposure to development, after exposing a predetermined matrix, the matrix which has been exposed in order to spray a high water pressure on the as-dried fluorescent film. The defect of peeling off the molded part together with the unnecessary film has been a major cause of film defects.

An object of the present invention is to provide a method for manufacturing a color cathode ray tube capable of manufacturing a high quality matrix molding part.

[0005]

A method for manufacturing a color cathode ray tube according to the present invention comprises a step of spraying water on a phosphor in a color cathode ray tube phosphor film forming line between an exposure step of baking a phosphor on a matrix and a development step. Is provided.

[0006]

[Function] The fluorescent film is moistened between the exposure and the development when the fluorescent film of the color cathode ray tube is formed, thereby softening the unnecessary phosphor that has not been exposed, thereby facilitating the peeling of the part during the development. be able to.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view of a wet apparatus used for a color cathode ray tube fluorescent film forming line which is an embodiment of the present invention, and FIG. 2 is a front view thereof.

The wet apparatus used in the present invention has an inclination angle α.
The spray nozzle 3 provided so as to be sprayed almost in the center of the cathode ray tube panel 1, and the spray nozzle 3 is attached and the splashed water is prevented from splashing to other places, and the excess water is received. Aquarium 4
And a pedestal 5 that supports the water tank 4, a drainage port 6 that drains excess water that falls into the water tank 4, and a water solenoid valve 7 (FIG. 2) that opens and closes the jetted water.

When the cathode ray tube panel 1 that has been exposed for forming the fluorescent film in the previous step is transferred while being mounted on the carrier head 2 and the panel 1 is stopped in front of the spray nozzle 3 at the inclination angle α, the electromagnetic wave for water is used. After the valve 7 is opened and atomized water is sprayed from the spray nozzle 3 for a certain period of time, the electromagnetic valve 7 for water is closed to finish the spraying, and the panel 1 is attached to the carrier head 2 from the wet device. Move to a developing device not shown.

[0011]

According to the present invention, moisture is contained in the exposed fluorescent film in advance, so that the efficiency in the subsequent developing step or the fixing rate of the fluorescent film is improved. Further, there is also an effect of reducing film defects during high-pressure development.

[Brief description of drawings]

FIG. 1 is a side view of an apparatus according to the implementation of the present invention.

FIG. 2 is a front view of an apparatus according to the implementation of the present invention.

[Explanation of symbols]

 1 Panel 2 Carrier Head 3 Spray Nozzle 4 Water Tank 5 Stand 6 Drainage Port 7 Water Solenoid Valve

Claims (1)

[Claims] 1. A color cathode ray tube fluorescent film forming line,
A method for producing a color CRT, comprising a step of spraying water on the phosphor between an exposure step of baking the phosphor on a matrix and a development step.