JPH0795423B2 - CRT manufacturing method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a cathode ray tube in which the position of the electron gun assembly with respect to the fluorescent surface of the cathode ray tube is accurately measured and set to seal the electron gun assembly at a predetermined position. It is a thing.

[Prior Art] Generally, in a manufacturing process of a color cathode ray tube, a fluorescent screen and a graphite electrode are formed inside a glass bulb, and a shadow mask or the like is attached, and then a stem having an electron gun assembly mounted at the opening end of the glass bulb neck part. The structure is sealed. In this case, it is required to align the horizontal axis direction of the fluorescent surface with the in-line horizontal axis of the electron beam passage hole of the electron gun structure.

As shown in the plan view of the positional relationship between the glass bulb and the electron gun assembly in FIGS. 8 (a) and 8 (b), this type of manufacturing method includes a fluorescent surface 1b and a graphite electrode (not shown) on the inner surface of the panel 1a. No.) is formed, and the outer peripheral surface of the panel 1a of the glass bulb 1 to which a shadow mask or the like is attached is brought into contact with the panel retainers 3a, 3b, 3c of the not-shown bulb holder as a reference, and the panel retainers 3a, 3b, 3c determine The reference axis X ₁ -X _{2 in} the horizontal direction of the illuminated fluorescent surface 1 b, and the blue (B) of the electron gun assembly 10 arranged to face the fluorescent surface 1 b,
Electron beam passage holes 10 ₁ and 10 corresponding to green (G) and red (R)
_After detecting the twist angle θ of ₂ and 10 ₃ with the horizontal axis M ₁ -M _{2 in} the in-line direction and adjusting the twist angle θ to be substantially zero, the sealing was performed (Japanese Patent Laid-Open No. Sho 10-96 51-97368).

[Problems to be solved by the invention]

According to the manufacturing method described above, the horizontal reference axis X ₁ -X ₂ of the fluorescent surface 1b is detected with reference to the outer peripheral surface of the glass panel 1a, and the outer surface dimension of the glass panel 1a is Since it has some dimensional tolerance in production,
The aforementioned twist angle θ is limited to about ± 0.5 degrees.
On the other hand, in recent years, color cathode-ray tubes (CRT), color display tubes (CDT), especially high-definition CDT, the twist angle is more severe, for example, θ is required to be within ± 0.3 degrees, but this cannot be satisfied. For this reason, a relatively large misconvergence always occurs on both sides of the screen, which deteriorates the image quality and requires a lot of adjustment man-hours.
There was a problem of reducing productivity.

INDUSTRIAL APPLICABILITY The present invention accurately matches the horizontal reference axis of the fluorescent surface during the sealing operation with the in-line horizontal axis of the electron beam passage hole of the electron gun structure, and thus makes it possible to produce a CRT with high productivity and with good productivity. It is an object of the present invention to provide a method for manufacturing a cathode ray tube that can be obtained.

[Means for solving problems]

The method for manufacturing a cathode ray tube according to the present invention includes a first detecting means for detecting the horizontal state of the fluorescent surface in the glass bulb mounted on the bulb holder, and an electron for the electron gun assembly mounted on the mount pin and mounted on the stem structure. A second detection means for detecting the in-line horizontal axis of the beam passage hole, and an arithmetic circuit for computing the detection signal by the first detection means and the detection signal by the second detection means to output a coincidence signal and a non-coincidence signal. A sealing device that seals the glass bulb neck part and the stem structure on which the electron gun structure is mounted by a signal, and a drive device that relatively rotates the bulb holder or the mount pin by a mismatch signal are provided. An electron gun assembly and a glass bulb neck part with a fluorescent mask etc. formed inside after aligning the horizontal axis with the in-line horizontal axis of the electron beam passage hole It is intended to seal equipped with a stem structure heat processed to.

[Action]

In the present invention, the twist angle between the horizontal reference axis of the fluorescent surface and the in-line horizontal axis of the electron gun structure is controlled.

〔Example〕

 Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a manufacturing apparatus for explaining an embodiment of a cathode ray tube manufacturing method according to the present invention. In FIG. 1, reference numeral 1 denotes a glass bulb having a fluorescent surface, a graphite electrode, etc. formed therein and a shed mask or the like attached thereto. As shown in FIG. 2, the glass bulb 1 has a fluorescent surface 1b in a panel 1a.
Two marks 1c and 1d made of a fluorescent substance set from the shed mask hole are formed on both end sides of the mark.
Imaginary line connecting the 1d forms a horizontal axis X ₃ -X ₄ in which the horizontal reference of the fluorescent face 1b. Therefore, this horizontal axis X ₃ −X ₄
May not match the reference line set from the outer shape of panel 1a. Reference numeral 2 is a bulb holder for holding the glass bulb 1, and the bulb holder 2 has a glass bulb 1
The outer peripheral surface of the panel 1a is held by the panel retainer 3. Four
Is a saddle that holds the funnel part 1e of the glass bulb 1,
Reference numeral 5 denotes a holder holder for holding the valve holder 2 and the saddle 4. The holder holder 5 has a slide portion 6 inside and has a first holder holder 5a and a first holder holder 5a which freely rotate in the directions of arrows AA '. It has two holder holders 5b. Reference numeral 7 is a support for fixing the second holder receiver 5b. Reference numeral 8 denotes a driving device which is fixedly arranged on the second holder receiver 5b and includes, for example, a pulse motor, and the gear 8a of the driving device 8 is provided.
Is engaged with the first holder receiver 5a, and the pulse signal input to the drive unit 8 causes the first holder receiver 5a to rotate in a predetermined pitch in the direction of arrow AA 'described above. Therefore, the second holder receiver fixedly arranged on the support 7
The glass bulb 1, the bulb holder 2, and the saddle 4 mounted on the first holder holder 5a via the slide portion 6 on the 5b.
And the like are integrated with each other and are driven by the drive device 8 to form an arrow A-A '.
Is rotated in the direction. Reference numeral 9 is a mount pin mounted with a stem structure 11 having an electron gun structure 10 and arranged coaxially with the glass bulb 1. Reference numeral 12 is rotation of the mount pin 9 in the arrow BB 'direction and arrow CC' direction. It is a drive device having a pulse motor and the like for performing vertical drive. The electron gun assembly 10 used here has a stem pin as shown in FIG.
On the stem glass 11b in which 11a is planted, the cathode K, the first
Guritsuto G _1, the second grids G _2, third grids G _3, fourth grids G _4, the fifth grids G _5, 6 grids G ₆ and 7 grids G ₇ are laminated successively at a predetermined size glass bead 10a It is supported and fixed by the third grid G ₃ and the fourth
As shown in Figures (a) and (b), three electron beam passage holes
10 ₁ , 10 ₂ and 10 ₃ are arranged in the in-line direction and their horizontal axis M ₁
Round or square reference holes 10 ₄ and 10 ₅ that define −M ₂ are provided. Further, in FIG. 1, reference numerals 13 and 14 are coaxially opposed to each other in the direction orthogonal to the mount pin 9 described above, and are images of the reference holes 10 ₄ and 10 ₅ of the third grid G ₃ described above, respectively. ITV camera, second ITV camera, 15,16
Is a ring-shaped first fluorescent lamp, a second fluorescent lamp, and a second fluorescent lamp 17 and 18 for illumination, which are coaxially arranged in front of the first ITV camera 13 and the second ITV camera 14, respectively. ITV camera 13, second IT
A first fluorescent lamp 15 and a second fluorescent lamp 16 are installed in front of the V camera 14, respectively, and a first hood and a second hood for preventing white light scattering are coaxially arranged. Reference numeral 19 denotes a reference hole 10 ₄ photographed by the first ITV camera 13 and second ITV camera
An image processing unit for measuring the absolute position of the reference hole 10 ₅ taken from the reference line in the screen by 14 and 20 is the horizontal axis X ₃ −X ₄ of the fluorescent surface 1 b and the horizontal axis of the reference holes 10 ₄ , 10 ₅ . It is a recognition calculation unit that detects a deviation angle θ from M ₁ -M ₂ and calculates an angle to be corrected. Reference numeral 21 is a monitor television, and 22 and 23 are reference points marks 1c and 1d (see FIG. 2) facing the glass bulb 1 and formed on the fluorescent surface 1b on the panel 1a in the horizontal axis X ₃ -X ₄ direction. Third ITV camera for imaging, fourth ITV camera, 24 is third
An image processing unit that measures the absolute positions of the reference marks 1c and 1d photographed by the ITV camera 22 and the fourth ITV camera 23 from the in-screen reference line, and 25 is the reference axis M ₁ -M ₂ of the third grid G _3. And a recognition calculation unit that detects an inclination angle θ between the horizontal axis X ₃ -X ₄ of the fluorescent surface 1 b and calculates the angle to be corrected, 26 is a monitor TV,
27 is the reference marks 1c and 1d, the shape of the reference holes 10 ₄ and 10 ₅ of the third grid G ₃ , the horizontal axis X ₃ −X _{4 of the} fluorescent surface 1b, and the horizontal axes of the reference holes 10 ₄ and 10 ₅ .
It is a central processing unit (CPU) that stores M ₁ -M ₂ and correction angles for these twist angles θ, and commands the drive devices 8 and 12 to execute their correction control operations.

Next, a method of manufacturing a cathode ray tube using the apparatus for manufacturing a cathode ray tube configured as described above will be described with reference to FIGS. 5 (a) and (b) and FIGS. 6 (a) and (b). In these figures, (a) shows a flow chart,
The figure (b) shows the situation in the process. In FIG. 5, first, the third ITV camera 22 and the fourth ITV camera 23 are operated in step 100, and the panel 1a is picked up by imaging.
If panel 1a is present after the presence or absence of
At 101, the reference marks 1c and 1d on the panel 1a are photographed by photographing the third ITV camera 22 and the fourth ITV camera 23, and the enlarged images thereof are respectively displayed on the display screen of the monitor TV26 as patterns. Next, in step 102, the absolute positions L ₃ and L ₄ from each screen reference line displayed in the display screen by the image processing unit 24 to the center of the enlarged image of each reference mark 1c, 1d are measured, respectively, and in step 103 The recognition calculation unit 25 detects the twist angle θ with respect to the horizontal axes X ₃ -X ₄ of the fluorescent surface 1b with respect to the horizontal axes M ₁ -M ₂ of the reference holes 10 ₄ , 10 ₅ of the third grid G ₃ , and the coaxial axes are coaxial. The angle to be converted is calculated, and the corrected angle is stored in the CPU 27. Next, in step 104, the alignment pulse motor of the drive unit 8 is driven by the command signal from the CPU 27 to rotate the glass bulb 1 in the AA 'direction to move the third grid G ₃
The reference holes 10 ₄ and 10 ₅ are made coaxial with the horizontal axes M ₁ -M ₂ .

Next, referring to FIG. 6, first, at step 110, the presence or absence of the electron gun assembly 10 is detected by photographing the first ITV camera 13 and the second ITV camera 14, and then when the electron gun assembly 10 is present, step 111 Release the clutch of the mount pin 9 connected to the drive unit 12, and press the 112th ITV camera.
13, the second ITV camera 14 captures enlarged images of the reference holes 10 ₄ and 10 ₅ on both sides of the third grid G ₃ and displays them on the display screen of the monitor TV 21. Next, in step 113, the absolute positions L ₁ and L ₂ from the screen reference lines displayed in the display screen to the reference holes 10 ₄ and 10 ₅ displayed on the display screen by the image processing unit 19 are measured, respectively, and recognized in step 114. Arithmetic section
The reference holes 10 ₄ , 10 with respect to the horizontal axis X ₃ -X ₄ of the fluorescent surface 1b
The deviation angle θ between the horizontal axis M _{1 and} M _{2 of 5} is detected, the angle for coaxialization is calculated, and the corrected angle is stored in the CPU 27. Next, in step 115, the drive device 12 is activated by the command signal from the CPU 27.
Drive the alignment pulse motor to rotate the first holder receiver 5a in the AA 'direction to rotate the horizontal axes M ₁ -M _{2 of} the reference holes 10 ₄ , 10 ₅ and the horizontal axis X _3- of the fluorescent surface 1b. Match X ₄ and make it coaxial. Then, the twist angle θ is a set value, for example ±
When the angle is 0.15 degrees or more, it is returned to the step 112 and the measurement and calculation are performed again. When the twist angle θ is ± 0.15 degrees or less, the mount pin 9 is fixed to the clutch by the step 116. After that, the drive device 12 raises the mount pin 9 in the direction of arrow C by a predetermined distance,
As shown in the figure, the neck portion 1A and the stem glass 11b on which the electron gun assembly 10 is mounted are overheated with a flame 31 generated by a gas burner 30 of the sealing device and welded for sealing.

According to such a method, the horizontal axis X ₃ -X ₄ of the fluorescent surface 1b and the horizontal axis M ₁ -M ₂ of the reference holes 10 ₄ and 10 ₅ of the third grid are aligned with high accuracy and the twist thereof is obtained. Since the angle θ can be set to substantially zero, the inclination between the horizontal direction of the glass bulb 1 and the in-line horizontal axis of the electron gun assembly 10 is set with high accuracy, for example, within ± 0.3 degrees, and the level of the dynamic convergence characteristic is set. It can be greatly improved.

Further, according to such a method, the inclination between the horizontal direction of the glass bulb 1 and the in-line horizontal direction of the electron gun assembly 10 is easily and accurately set and sealed, so that the occurrence of misconvergence is significantly increased. In addition to being reduced, the adjustment work by the deflection yoke is extremely easy and shortened, and the productivity can be improved.

Further, according to such a method, the horizontal axis X ₃ − of the fluorescent surface 1b is −
The X ₄ and the in-line horizontal axis M ₁ -M _{2 of the} electron gun assembly 10 are matched with each other with high accuracy, and the glass bulb 1 and the stem assembly 11 are driven in the axial direction after the twist angle θ is set to almost zero, and heating is performed. As it can be processed, holder holder 5, mount pin 9
The sealing can be performed without twisting in the rotation direction, and the sealing can be performed with high accuracy and easily. In particular, it is more effective to perform the sealing using a valve that does not have a cullet portion to be discarded after sealing at the opening end of the neck portion, that is, a valve having a culletless structure.

In the embodiment described above, in order to make the central axes M ₁ -M ₃ of the reference holes 10 ₄ and 10 ₅ of the electron gun assembly 10 and the horizontal axes X ₃ -X _{4 of the} fluorescent surface 1b coaxial, By fixing the mount pin 9 and driving the alignment pulse motor of the drive unit 12 to rotate the first holder receiver 5a in the AA 'direction,
Although the glass bulb 1 side was rotated, the holder receiving 5 side was fixed and the alignment pulse motor provided in the drive unit 12 was driven to move the mount pin 9 to the B-
The same effect as described above can be obtained by rotating in the B'direction and rotating the side of the electron gun assembly 10 for coaxialization.

Further, in the above-described embodiment, the structure having the reference hole in the third grid G ₃ is adopted, but the structure is not limited to this, and it goes without saying that the horizontal axis may be replaced by a vertical axis, for example. Furthermore, it goes without saying that the present invention can be applied to the delta type.

〔The invention's effect〕

As described above, according to the present invention, the twist angle between the predetermined axis of the fluorescent surface, for example, the horizontal axis and the predetermined axis of the electron gun structure, for example, the in-line horizontal axis of the electron beam passage hole is controlled, and the high angle is controlled. Since they can be matched and sealed with accuracy, it is possible to obtain extremely excellent effects such as obtaining a cathode ray tube having good dynamic convergence characteristics with high productivity.

[Brief description of drawings]

FIG. 1 is a block diagram of a manufacturing apparatus for explaining an embodiment of a method for manufacturing a cathode ray tube according to the present invention, FIG. 2 is a plan view showing a panel, and FIGS. 3 and 4 are views showing an electron gun assembly. 5 (a) and 5 (b) are views for explaining the detection of the horizontal axis of the glass bulb, FIG. 6 is a view for explaining the detection of the horizontal axis of the electron gun assembly, and FIG. 7 is a description of the sealing method. Figure, Figure 8 (a),
(B) is a plan view showing the positional relationship between the panel and the electron gun assembly. 1 …… Glass bulb, 1a …… Panel, 1b …… Fluorescent surface, 1
c, 1d …… Marker, 1e …… Funnel section, 2 …… Valve holder, 3 …… Panel retainer, 4 …… Saddle, 5,5a, 5b …… Holder holder, 6 …… Slide section, 7 …… Support , 8 ……
Drive device, 8a ... Gear, 9 ... Mount pin, 10 ... Electron gun assembly, 10 ₁ , 10 ₂ , 10 ₃ ...... Electron beam passage hole, 10 ₄ , 10 ₅
…… Reference hole, 11 …… Stem structure, 12 …… Drive device, 13,1
4 …… ITV camera, 15,16 …… Fluorescent lamp, 17,18 …… Hood,
19 ... Image processing unit, 20 ... Recognition calculation unit, 21 ... Monitor T
V, 22, 23 ... ITV camera, 24 ... Image processing unit, 25 ... Recognition operation unit, 26 ... Monta TV, 27 ... CPU, 30 ... Gas burner, 31 ... Flame.

Claims (1)

[Claims] 1. A mark made of a fluorescent material is formed on the outside of the fluorescent surface of the panel of the glass bulb, and by detecting the mark, the first axis of the glass bulb is detected and mounted on the stem structure. The second axis of the electron gun assembly that should correspond to the first axis is detected, and after matching the first and second axes within a predetermined range, the neck portion of the glass bulb and the A method for manufacturing a cathode ray tube, which comprises sealing the stem structure.