JPS5812238A - Production method of crt - Google Patents

Abstract

PURPOSE:To easily match the center of a phosphor screen with the axis of an electron gun by inserting the electron gun after positioning the envelope of a CRT by means of a dummy jig emitting a reference ray for positioning then by welding a neck and a stem. CONSTITUTION:The envelope of a CRT is fitted to a sealing jig having an envelope support stand 11 and a neck supporter 12, and a dummy jig 10 formed to match with the axis of an electron gun is mounted and fixed on the top of a support body 14 movable up and down nearly along the axis of a neck 4, then the supporter 12 is moved while the bulb spacer 8 of the jig 10 is moved up and down along the inside wall of the neck 4 so as to be aligned with the center of a phosphor screen 1, thus the envelope is positioned and fixed. Next, the dummy jig 10 is removed and the electron gun equivalent to the jig 10 is inserted, and the neck and a stem are welded. Thereby, the positional precision of the electron gun in relation to the phosphor screen is made excellent, and a high quality CRT can be available.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to all cathode ray tubes). %O for the OII manufacturing method.

For example, an optical 7 eyeper tube, which is a type of printer tube, uses electrical signals from an external S circuit to intercept the electron beam from an electron gun between the folds, focus it, and deviate its thickness. Nine fluorescent lights are formed on the inner surface of the panel made of eyeglasses.
The fluorescent surface is made to emit light, and the light is guided to the outside through a panel, and the photosensitive paper placed extremely close to this panel is reproduced on other recording sickle members. KX& is written so that the image is recorded.

However, the Printer Tube funnel and neck are integrally formed on the KokoIll, and a panel is welded to the elongated open end of the Oy funnel through 7-lit glass to form the Ninety-nine enclosure. The external shape of this envelope is t*a
In terms of needle setting, it is not possible to provide a ninth reference point, which is difficult to create with the precision of a color picture tube.

For this reason, conventionally, the electron gun that is inserted along with the stem from the open end of the neck has to be visually checked to ensure that the stem is in the center of the neck, and then the stem and neck are sealed. This is the current situation. The same applies to panel welding.

Therefore, in cathode ray tubes such as printer tubes manufactured in this manner, the extension of the neck axis and/or the extension of the gun axis of the electron gun does not necessarily lie at the center of the fluorescent surface.

As a result, cathode ray tubes such as printer tubes, in which the effective area of the fluorescent surface is small, have the disadvantage that the position of the beam spot on the fluorescent surface varies greatly.

In order to eliminate this drawback, it is conceivable to provide a reference point, for example, in the funnel of the envelope, but this increases the cost of the external FM device and has many problems in terms of profitability.

The present invention was made in view of the above-mentioned problems in the prior art, and an object of the present invention is to provide a method for manufacturing a cathode ray tube that allows the center of the fluorescent surface to match the axis of the electron gun very easily. It is said that

Next, an embodiment of the method for manufacturing a cathode ray tube according to the present invention will be explained with reference to FIGS. 1 to 4.

First, as shown in Fig. 1, there is a panel (2) having a fluorescent surface (1) adhered to its inner surface, and a neck (4) connected to this panel (2) via a K funnel (3). As shown in FIG. 2, the cathode ray tube envelope consists of a stem (5), a cylinder +6), a convergence electrode (7) and a bulb (8), and the stem (5). A reference light beam (not shown) from a light emitter (not shown) installed inside or outside the
9) A dummy jig Ql is prepared, which is formed so as to align with the gun axis of an electron gun, which will be described later, in the fluorescent opening direction through the cylinder (6).

Next, as shown in Figure 3, the envelope support stand αυ and the neck (
4) Attach the envelope of the cathode ray tube to a sealing jig having a neck support part a that can be moved back and forth and left and right.

In addition, the gummy jig is fixed on the base 0, which is substantially perpendicular to the axis of the neck (4), on the top of the support I, which is movable up and down substantially along the axis of the neck (4). A(l
While moving the bulb spacer (8) of I (4) up and down on the inner wall, move the neck support part α so that the reference light II (9) contacts the center of the fluorescent surface (1). Then, the envelope consisting of the panel (2), funnel (3) and neck (4) is positioned and fixed. In this case, care must be taken to ensure that the plurality of valve spacers are brought into uniform elastic contact with the INK in the neck (4).

Next, take out the dummy jig a1 □, and set the die i = jig・H in advance.
For example, a stem lead C' as shown in FIG.
#Il assembled on Ste Muro that was planted through υ
Guri 1. Do (c), 2nd grid Q 3rd grid (2)
Place and fix the electron gun (hereinafter referred to) consisting of the fourth grid convergence pole and valve spacer on the top of the support 040, and attach the valve spacer (hereinafter referred to) to the inner wall of the envelope (41). Insert it as a guide and weld the screw (4) and stem (c) at the predetermined position.

According to such a manufacturing method, the reference light 11 for positioning is
Dummy jig C1 for injecting f91 (first 1I by 1)
After positioning the envelope of the JF polar ray tube in advance, insert an electron gun (to) equivalent to this dummy jig α, and weld the bolt (4) and stem (c). When the electron beam from (to) is not deflected, it always strikes the center of the phosphor surface of the electron gun (to). The positional accuracy for 1) is extremely good, making it possible to obtain a high-quality cathode ray tube.

′ In this case, I have selected and excluded it in advance - the child is parbusbe ′? 1 again by changing the shape of (2), etc.
It goes without saying that they can be used by separating them. −

[Brief explanation of drawings]

1 to 4 are diagrams showing an embodiment of the method for manufacturing a cathode ray tube according to the present invention, in which FIG. 1 is a sectional view of the envelope, FIG. 2 is a side view of a dummy jig, and FIG. The figure shows the alignment of the envelope and the gummy jig using a sealing jig.
The explanatory diagram shown in FIG. 4 is a front view showing an example of an electron gun assembled on a stem. l... Fluorescent surface 2" Panel 3 Funnel 4 Neck 9 - Reference light +1! 1 o... Gummy jig 11... Envelope support stand 12... Neighborhood support part 14... Support body
3o...electronic gun agent patent attorney Inoue −

Claims (1)

[Claims] A stem having a stem lead implanted through the open end of the neck of the outer device, which consists of a nine panel having a fluorescent surface adhered to its inner surface, and a nine netter connected to the panel via a funnel. In the method of manufacturing a nine cathode-wrapped tube, an electron gun that is fitted with nine pulp spaces is inserted onto the stem, and the neck and the stem are sealed at a predetermined position. A dummy jig that has the pulse spanner and emits a reference beam along the gun axis of the electron gun is attached to the stem, and the KJi is made so that the reference beam is aimed at the center of the panel. A process of adjusting the support part, and inserting the assembly of the stem and the electron gun, which have been sorted in advance into the gummies and tubes, into the open end of the neck in a predetermined position. A method for using a cathode ray tube O#, characterized in that the method is made such that the tube is sealed and sealed.