JPS5931540A - Manufacture of cathode-ray tube - Google Patents

Abstract

PURPOSE:To eliminate wasteful consumption of thermal energy while saving later reheating in order to shorten a manufacturing time by effectively utilizing the heat held by a cathode-ray tube coming out of an exhaust furnace after an exhaustion process and the sealing process of an exhauste pipe. CONSTITUTION:Each part of a cathode-ray tube in a state of high temperature when coming out of an exhaust furnace 12 reaches each prescribed temperature T15, T18 and T21 respectively by radiation cooling before moving to each device 15, 18 and 21. Then the carrier speed of an overhead conveyer 14 and the positions of each device 15, 18 and 21 are set up while leaving possibility of becoming unable only this much to satisfy the temperature conditions in each process due to the fluctuation of a surrounding temperature. Therefore, in order to surely maintain the temperature T18 when performing getter flushing, this system detects the surface temperature of each cathode-ray tube by means of a temperature sensor 17 to find the mean value of each detected temperature in the fixed period by means of a computor basing on said detected temperatures. Said means value is compared with the preset value in order to regulate the carrier speed of an overhead conveyer 14. In this way, there is no need of reheating in the manufacturing process of the cathode-ray tube after performing exhaustion and the sealing an exhaust pipe thus able to eliminate waste consumption of thermal energy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for manufacturing a cathode ray tube, and particularly to improvement of the process from exhaust to explosion-proof treatment.

[Technical background of the invention]

During the manufacture of cathode ray tubes, after the exhaust process of discharging the air inside the cathode ray tube from the exhaust pipe and the sealing process of sealing the exhaust pipe by heat-sealing the exhaust pipe, residual strain is generated in the electron gun sealing part of the cathode ray tube. A heat shock test process in which the electron gun sealing part is rapidly cooled to confirm the presence or absence of the electron gun, a getter flushing process to increase the degree of vacuum inside the tube using a getter placed in advance inside the cathode ray tube, an explosion-proof treatment process, and an external conductive film coating. The steps are performed sequentially, and after the getter flushing step, a withstand voltage test and the like are performed on the frit glass portion in which the cathode ray tube panel and the funnel are sealed together with the frit glass.

[Problems with background technology]

In the conventional process described above, as shown in Figure 1, a cathode ray tube in a high temperature state immediately after exiting the exhaust furnace after an exhaust process and an exhaust pipe sealing process is removed, for example, at the exhaust furnace exit position (P,). After a cathode ray tube with a panel surface of approximately 120 C=(T,) is allowed to cool while being transported on a conveyor, the electron gun sealing part, that is, the stem and The neck part is about 700
= CT2), and perform a heat shock test on the electron gun sealing part by spraying cold water on the stem and neck using the heat shock test device at position (P2). Then, after being left to cool while being conveyed on a conveyor, it is subjected to getter flushing and dehumidification. Getter flushing and explosion-proof treatment are performed at the device position (P3).

Then, after being left to cool while being transported on a conveyor, the cathode ray tube is transferred to the outer 4-7 film coating area, that is, the outer surface of the funnel, at a temperature of 40 to 45 tZ before being moved to the position (P4) of the 18-m film coating device. The cathode ray tube is then reheated to the temperature (T5).Then, the outer surface of the funnel is coated with an outer conductive layer by applying an outer 4*7 film at position (P4).

Therefore, in this conventional process, it is necessary to reheat twice, resulting in poor thermal efficiency.Furthermore, since cooling and heating are repeated, the external conductive film coating device is It took about 2 hours to finish applying the odor at position (P4).

For this reason, there were problems such as the manufacturing process taking too much time.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned points, and effectively utilizes the heat held by the cathode ray tube that has exited the exhaust furnace through the exhaust process and sealing process of the exhaust pipe, thereby reducing subsequent reheating. The aim is to eliminate wasteful consumption of thermal energy by omitting this process, and further shorten manufacturing time.

[Summary of the invention]

The method for manufacturing a cathode ray tube of the present invention involves cooling the electron gun sealing part of the cathode ray tube to a predetermined temperature without reheating (quick cooling) the cathode ray tube in a high temperature state with the exhaust and exhaust pipe sealed. A heat shock test was performed on the electron gun sealing part, and then the panel surface of the cathode ray tube was allowed to cool down to a predetermined temperature, and getter flushing was performed.
The method is characterized in that after the funnel of the cathode ray tube is allowed to cool to a predetermined temperature, an external conductive film is applied without reheating, and then explosion-proofing treatment is performed. By satisfying the conditions, each process was organized in such a way that the heat held by the cathode ray tube emitted from the exhaust furnace could be effectively used. By omitting this, there is no wasted consumption of thermal energy (and furthermore, the manufacturing time is greatly shortened).

[Embodiment of the Invention] Next, the brown W manufacturing method of the present invention will be specifically described based on an embodiment shown in the drawings.

]・In Figure 2, (lυ is a chain conveyor. This chain conveyor 11 passes through the exhaust furnace 02 and is arranged in an endless manner. A cathode ray tube is connected to the exhaust furnace 02 in front of the entrance (12,). At the same time, the cathode ray tube is transported in front of the outlet (124) of the exhaust furnace 02 via a transfer a (131).

An overhead conveyor αa is connected to the cathode ray tube unloading section of the transfer machine OJ. This conveyor αa passes through the heat shock test device 05 and is arranged in an endless manner. The cathode ray tube placed on the cathode ray tube mounting portion of the overhead conveyor 04) on the transfer machine α4 is configured to pass through a heat shock test device go4 and then to be carried out via the transfer machine αQ.

In addition, in the Seven Lines Competition 11+14j,
There is a temperature sensor (17) in front of the cathode ray tube in the moving direction of the transfer 1iiJ machine 06) that detects the temperature of the surface of the cathode ray tube panel.
) is provided, and the conveying speed jq of the conveyor 04) is adjusted by this temperature sensor Q'7).

Then, a getter flushing and withstand voltage test device 0Q is connected to the cathode ray tube unloading section of the above-mentioned transfer tH6,
This device 08) is equipped with an external conductive film coating device W (2I) at the middle -1+11 section of the transfer machine (connected to the roller conveyor (2fj via 1!1)). ing.

Also, the above conveyor c! (A basing device shift is disposed at the proximal end -+11 portion of 8.

Conveyor C! (A) is connected to the cathode ray tube unloading section of the above conveyor (21) through the transfer machine, and an explosion-proof processing device (2j) consisting of a banding mechanism etc. is installed on the brown side of this conveyor U. ing.

Next, the effect will be explained.

The cathode ray tube carried to conveyor Qll is
While moving inside the exhaust furnace (+21), the exhaust and the exhaust pipe are sealed, and as shown in Figures 2 and 3, the position (P, In 2), the face surface, that is, the panel surface is heated to a predetermined temperature of about 120 tl:' and exits from the exhaust furnace (+21).

Then, this high-temperature cathode ray tube is transferred to the overhead conveyor circle via a transfer machine (1).The cathode ray tube is transferred to the heat shock test device α9 by this conveyor 04, and is left to cool. As shown in Figure 2, at the position (P, 5) of the device a9, the electron gun sealing portion, that is, the stem and neck portion is about 70 tl? be lowered to a predetermined temperature (T, 5). In this state, the device (15
1, a heat shock test of the electron gun sealing portion is performed by pouring cold water onto the stem and neck portions.

Next, this cathode ray tube is connected to an overhead conveyor (
14) to transfer machine 0]j), and this transfer machine (
It is transferred to the getter flushing and dielectric strength test equipment cod via I(?l) and left to cool.
l = 2 Figure K shows - f Brown 1 at the position (P18) of Younisou [1 (Ll't)! The surface temperature of the device 08 drops to a predetermined temperature (T, 8) below 75C, and in this state, the device 08
), the pressure resistance test of the getter flashing and sealing frit part is performed.

Next, this cathode ray tube is transferred to conveyor C,!I11 via transfer station j (il), and this conveyor C20
) is moved to the external conductive film coating device υ, and the device is cooled as shown in Figure 2. At the +211 position (P2.), the external conductive film coated portion, that is, the outer surface of the funnel, is lowered to a predetermined temperature (T2.) of 40C to 45C.

In this state, the funnel outer surface of the cathode ray tube is coated with a conductive film by the device eυ.

Note that this cathode ray tube is connected to the transfer machine α1 and the external unit 4.
A protective socket is introduced into the stem bin of the cathode ray tube by the basing device (2) between the 'tR film coating device f (211) and the basing device (211).

Next, this cathode ray tube is moved by a roller conveyor (21) to a transfer machine (231), and transferred to a two-way roller conveyor (incorporated) via this transfer machine C! Explosion-proof disposal equipment Q9 while moving
Explosion prevention treatment such as banding is performed from Vc.

In this system, the explosion-proof treatment is completed at the time required to perform a series of one culm, that is, at the position (P, 2) of the exhaust furnace outlet (124) shown in Figures 2 and 3. The time required for the cathode ray tube to move to position fif (P25) is about 40 minutes, which is a huge reduction in the time required for the conventional method, about 2 hours.

In addition, in this system, each part of the cathode ray tube in a high temperature state coming out of the exhaust furnace (12+) is
(By the time it moves to 2υ, the specified temperature (T, 5
) (T18) (T2. ) is reached. Here, the conveyance speed of the overhead conveyor (14) and each load P7α51
(IQ (211 position, etc.) are set, but this alone is not enough to change the temperature at each culm due to fluctuations in ambient temperature.
＋ items cannot be satisfied (there is a possibility that it will happen).

Therefore, in this system, in order to ensure that the temperature (T, 8) is maintained particularly when performing getter flushing, the temperature on the surface of each cathode ray tube is detected by a temperature sensor αη, and based on this detected temperature, the computer The average value of each detected temperature is determined based on a fixed period. The conveyance speed of the overhead conveyor (14) is adjusted by comparing this with a set value.

Furthermore, while adjusting the speed of the overhead conveyor 04), it is limited due to the synchronized operation with each device (18) (2111251, etc.), so the adjustment to the temperature (T, 8) remains within the range of fine adjustment. In order to solve this problem due to fluctuations in ambient temperature, exhaust furnace Q2
If a tunnel-shaped heat insulating part is connected to the outlet (124) of the good. In this way, the panel surface temperature of the cathode ray tube can be adjusted to a predetermined temperature (T, 8) when getter flushing is performed.

Additionally, this system eliminates the need for reheating, which was conventionally done twice, so there is no waste of thermal energy.For example, in the case of a 13-inch color CRT, it is possible to save approximately 120 Kcal of energy per CRT. Ta.

〔Effect of the invention〕

As described above, according to the present invention, there is no need for reheating during the production of edge-shaped cathode ray tubes in which the exhaust and exhaust pipes are sealed, thereby eliminating wasteful consumption of thermal energy. Furthermore, since cooling and heating are not repeated multiple times, manufacturing time can be significantly reduced.

[Brief explanation of the drawings] Figure 111 is a thermal cycle diagram of each process in the conventional method.
・Figure 2 is a plan view showing a cathode ray tube manufacturing line according to an embodiment of the present invention. ・Figure 3 is a thermal cycle diagram of each process. a2Φ - Exhaust furnace for evacuation of cathode ray tubes and sealing of the exhaust pipes (15...equipment for heat shock testing, group u...equipment for performing getter flushing, CI
! υ...Equipment for applying external conductive film, (To)...Equipment for explosion-proof treatment.

Claims (1)

[Claims] (1) For a cathode ray tube in a high temperature state with the exhaust and exhaust pipes sealed, the electron gun sealing part of the cathode ray tube is left to cool down to a predetermined temperature, then rapidly cooled and a heat shock test of the electron gun sealing part is performed. Then, after the panel surface of the cathode ray tube is allowed to cool to a predetermined temperature, getter flushing is performed, and after the funnel of the cathode ray tube is allowed to cool to a predetermined temperature, an external conductive film is applied, and then explosion-proof treatment is performed. A method for manufacturing a cathode ray tube characterized by: