JPS59228341A - Manufacture of cathode-ray tube - Google Patents

Abstract

PURPOSE:To effectively perform raster aging and obtain a cathode-ray tube with stable characteristics by moving a deflection device to the axial direction of the cathode-ray tube during the raster aging process. CONSTITUTION:When a deflection device 6 approaches to an electron gun 4 side, the electon beam issued from the electron gun 4 is scanned at an angle theta although it is done differently depending on the deflection angle of the deflection device 6. When the deflection device 6 approaches to a funnel 2, the electron beam is scanned at the angle theta and a cross hatching section 73 from a panel 1 to the funnel 2 is used as the electron beam passing and bombardment area. As a result, when the deflection device moves gradually, the panel 1, the whole surface of the funnel 2, and a part of a neck 3 are raster-aged and almost all areas in a vacuum enclosure can be used as the electron beam passing and bombardment area. A greater part of residual gas can be emitted by the electron beam and be adsorbed in a getter.

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 relates to a raster aging process performed during the manufacturing process of a cathode ray tube.

[Technical background of the invention and its problems]

In the manufacturing process of cathode ray tubes, in which an electron gun consisting of multiple electrons including a cathode and 4 return forces is attached to the neck of a vacuum envelope consisting of a panel, a funnel, and a neck crab, a coating is applied onto the base metal. Ternary carbonate (Ba, Sr
, Ca) Cog is thermally decomposed in the exhaust gas of the envelope to become a thermionic emitting substance consisting of (Ba, Sr, Ca) 0 force≧, which is the so-called active process. Usually, this exhaust gas is Since sufficient thermionic emission characteristics cannot be obtained by thermal decomposition alone, after flashing the getter, a further activation operation of the cathode is performed to stabilize the thermionic electron emission characteristics. This activation process involves a method of heating the cathode or passing a cathode current to activate the f-occupancy, and a method of activating the cathode ray tube under conditions similar to those found in television equipment, i.e., the phosphor screen on the inner surface of the panel. is scanned with an electron beam to draw a raster.
There are two types of so-called raster aging methods75 that are active, and these two types are usually used individually or in combination.

To further explain the raster knee bias method, a cathode ray tube is attached to the television equipment itself or a special device with functions similar to the television equipment, and the phosphor screen is Raster drawing for several minutes to several hours while drawing raster
undergoing an aging process.

However, conventionally, in this raster aging process, a deflection device is fixed to the outer wall of the cathode ray tube from the funnel to the neck, so that the electron beam passage and impact area are constant during the raster aging process.

For this reason, one of the main purposes of the raster aging process, which is to emit the residual gas in the vacuum envelope using an electron beam and adsorb it to the getter, is insufficient, and as a result, a cathode ray tube with stable characteristics cannot be obtained. There was a problem that it was difficult to use.

[Purpose of the invention]

The present invention has been devised in view of the above-mentioned problems, and an object of the present invention is to provide a method for manufacturing a cathode ray tube that can effectively carry out raster aging and obtain a cathode ray tube with stable characteristics.

[Summary of the invention]

The present invention provides an electron gun that is installed on the outer wall from the funnel to the neck during the manufacturing process of a cathode ray tube, in which an electron gun consisting of a plurality of electrodes including a cathode is attached to the neck of a vacuum envelope consisting of a panel, a funnel, and a neck. The cathode ray tube has a raster aging process in which a raster is drawn by an electron beam from an electron gun on the phosphor screen on the inner surface of the panel using a deflection device, the cathode is activated, and the residual gas in the vacuum envelope is removed. This method of manufacturing a cathode ray tube is characterized in that a deflection device is moved in the axial direction of the cathode ray tube during a raster aging step.

[Embodiments of the invention]

Next, an embodiment of the method for manufacturing a cathode ray tube according to the present invention will be described with reference to FIGS. 1 and 2.

namely, panel (1), funnel (2) and neck (3).
) An electron gun (4) consisting of a plurality of electrodes including a cathode is installed inside the vacuum envelope assembly (3). is provided with a deflection device (6) that can move in the direction of the arrow (5), that is, in the axial direction of the cathode ray tube.

As shown in Figure 1, when the deflection device (6) is brought closer to the electron gun (4), the electron beam from the electron gun (4) scans at an angle (θ), which varies depending on the deflection angle of the deflection device (6). A part of the shell hits the inner wall of the neck (3), and a part of it hits the inner wall of the neck (3), that is, the angle (α
) will draw a raster pattern on the fluorescent screen on the inner surface of panel (1), and the electron beam in
)(7□) is the area through which the electron beam passes and hits.

Next, as shown in Figure 2, insert the deflection device (6) into the funnel (
2), the electron beam is scanned at an angle (θ) of 11. The cross-hatched portion (73) from the panel (1) to the funnel (2) becomes the area through which the electron beam passes and is projected.

That is, by gradually moving from the state shown in Fig. 1 to the state shown in Fig. 2, the entire surface of the panel (1), the funnel (2), and a part of the neck (3) are subjected to raster aging, and the vacuum surrounding area is reduced. The electron beam passes through almost the entire area inside the device,
It is possible to make it a projecting region, and most of the residual gas can be emitted by the electron beam and absorbed into the getter. As a result, it became possible to obtain a cathode ray tube with stable characteristics.

As the deflection device used in the above embodiment, by using a deflection device that can deflect a wider angle than that used when incorporating a cathode ray tube into a television device, it is possible to scan the electron beam over a wide range, and the residual gas can be further reduced. There is no need to explain that a cathode ray tube with less .

〔Effect of the invention〕

As mentioned above, by this firing, the residual gas in the vacuum envelope can be sufficiently released and absorbed into the getter, and the cathode can be activated with cathode current. A cathode ray tube of good quality can be obtained.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are diagrams showing one embodiment of the present invention,
Figure 1 is an explanatory cross-sectional view showing the passage of the electron beam and the injection area when the deflection device is moved closer to the electron gun. FIG. 3 is an explanatory cross-sectional view showing a protruding region. 1・-・/S flannel 2・funnel 3・・
・Neck 4...Electron gun 6...Deflection device
717.73...Electron beam impact area representative Patent attorney Inoue -M (Figure 1) Figure 2

Claims (1)

[Claims] During the manufacturing process of a cathode ray tube, an electron gun consisting of a plurality of electrodes including a cathode is attached to the neck of a vacuum envelope consisting of a panel, a funnel, and a neck. The deflection device is configured to draw a raster on the phosphor screen on the inner surface of the panel using the electron beam from the electron gun, thereby activating the cathode and releasing the residual gas in the vacuum envelope.
A method for manufacturing a cathode ray tube including an aging step, wherein the deflection device is moved in the axial direction of the cathode ray tube during the raster aging step.