JPS61168836A - Drier for color cathode-ray tube - Google Patents

Abstract

PURPOSE:To prevent a heater from being stained with splash of the residual application liquid stuck to the heater of a cathode-ray tube by changing the relative positions of the cathode-ray tube to be heated and the heater at the time of heating for drying in a fluorescent film manufacturing process. CONSTITUTION:The panel 2 of a cathode-ray tube mounted on a carrier bed 1 is set at an angle alpha while being rotated at high speed to recover a surplus portion of the application liquid. Next, said panel is swirled up to the angle betato be dried by heating while facing a heater 5. During said process the heater 5 retires to the position A in company with the shifting of a heater frame plate 6 by means of an air cylinder 3 and a guide axis 9 operating according to an electrical signal while advancing to the position B for heating, when the head 1 swirled to the angle beta. Accordingly, the heater 5 and the heater construction frame 4 are prevented from being stained by the residual application liquid while the heater 5 is protected against corrosion and the efficiency of the heater is heightened.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in a drying device used in the process of manufacturing a phosphor screen of a color cathode ray tube.

(Prior art) Generally, the fluorescent film of a color cathode ray tube is produced by applying a coating solution (slurry) containing phosphor to the inner surface of the cathode ray tube panel, then rotating the panel to shake off the coating solution, drying, and developing. In this case, an infrared heater is used as a drying device. Conventionally, this type of drying device has been installed on a carrier head and parallel to a panel with a predetermined rotation speed and inclination angle. An infrared heater installed and fixed at the position is used.

(Problem to be solved by the invention) However, in the conventional drying equipment, at the heater drying position provided next to the coating liquid recovery position in the fluorescent film manufacturing process, the tilt angle of the panel installed in the carrier head is The infrared rays are rotated from an angle in the collecting position (14(r) to the vertical) to an angle in the drying position (75° to the vertical) and are fixed in close proximity as the panel rotates around its axis. The residual coating liquid on the panel circle is scattered on the heater and adheres to the heater heating element, reflector, etc., and the heater body is eroded by the coating liquid components, causing electrical problems.

SUMMARY OF THE INVENTION An object of the present invention is to provide a drying apparatus which can eliminate the above-mentioned drawbacks and prevent corrosion and electrical radiation caused by adhesion of coating liquid to an infrared heater.

(Means for Solving the Problems) The present invention is designed to move the pedestal on which the heater is installed to a distance from the panel when moving and turning from the angle of the coating liquid collection position to the angle of the heater drying position, so that the coating liquid is scattered due to the rotation of the panel. To provide a heater moving device that protects an infrared heater from the range of adhesion and advances a heater mount up to a predetermined distance based on an electric signal indicating that the heater has stopped at a predetermined drying position.

That is, the present invention provides an apparatus that applies a coating liquid (slurry) in which phosphor powder is suspended in a water-soluble photosensitive binder, shakes it off, and then dries it in the color cathode ray tube phosphor film manufacturing process. It is characterized by having a mechanism that can move the pedestal to which the infrared heater is added in parallel in the direction of the panel inclination.

(Example) The present invention will be described in detail below based on the drawings. FIG. 1 is a plan view showing a heater drying device used in the color cathode ray tube fluorescent HX manufacturing process. FIG. 2 is a side view showing the above outline.

The drying device of the present invention includes a plurality of infrared heaters 5 arranged substantially parallel to the panel surface, and a heater mounting base 4 supporting the heaters 5.

It is separated from the air cylinder 3, which includes a heater pedestal plate 6 that supports the pedestal 4, and a guide shaft 9 provided on the back side of the pedestal plate 6. The guide shaft 9 expands and contracts by the operation of the air cylinder 3, and the heater moves between the A position and the B position.

Next, the relationship between this drying device and the panel will be explained.

The panel 2 attached to the carrier head l is rotated counterclockwise (
A predetermined number of rotations and a predetermined inclination angle are set in the direction of the arrow shown in the figure, and the motors sequentially move. In the fluorescent film manufacturing process, the panel 2 is set at an angle of ♂ from the vertical at the coating liquid collection position and rotated at high speed to collect excess coating liquid. Next, the panel heater 5 is moved back to the p-person position by the air cylinder 3. The movement and turning is complete! When the panel is positioned at B, the air cylinder 3 drives the frame 4 to position B.
moves. The amount of movement of the heater 5 is varied by a movement amount adjusting plate 7 and an adjusting screw 8 provided on the back surface of the heater mount plate 6. Furthermore, a protection plate 10 is provided to prevent residual coating liquid from scattering and adhering to the air cylinder 3 and guide shaft 9 during movement and turning.

(Effects of the Invention) According to the present invention, the drying device is retracted far from the normal panel drying position until the panel moves and turns and is set at the drying position. It can protect the heater from being eroded by residual particles scattering and adhering.
It has become possible to improve the efficiency of the heater and at the same time extend the life of the heater.

[Brief explanation of the drawing]

FIG. 1 is a front view of an embodiment of the present invention, and FIG. 2 is a side view of FIG. 1. DESCRIPTION OF SYMBOLS 1...Carrier head, 2...Panel, 3...Air cylinder, 4...Heater installation stand, 5...Heater, 6...Heater stand plate, 7...Movement adjustment plate , 8
...adjustment screw, 9...guide shaft, 10...protection plate. -,,/

Claims (1)

[Claims] In the color cathode ray tube phosphor film manufacturing process, a coating solution (slurry) in which phosphor powder is suspended in a water-soluble photosensitive binder is applied to the panel, shaken off, and then dried using an infrared heater. A color cathode ray tube drying device characterized by having a mechanism for moving an erected frame relative to a panel.