JPH0927274A - Correcting method for use in manufacture of cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the rate at which cathode-ray tubes are rejected as defectives so as to enhance the yields of products by properly correcting the welding positions of support springs on a color separation electrode so that the interval between the inner surface of a panel and the color selection electrode is standardized. SOLUTION: A color selection electrode 2 is mounted on a panel 1 by fitting pin holes 14 in the support springs 10 to 13 of the color selection electrode 2 over the panel pins 16 to 19 of the panel 1 so that grill height GH, that is, the interval between the color selection electrode 2 and the panel 1, is standardized. With a plurality of points at the center and periphery of a screen as control points, the first averaged amount of movement of the GH at each control point near the periphery is calculated, and the second amount of movement of the GH at the control points in the center is calculated. Within the standard of the first amount of movement, the welding positions of the support springs 10 to 13 are corrected so that the second amount of movement is standardized. Therefore, the rate at which cathode-ray tubes are rejected as defectives can be decreased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a correction method in manufacturing a cathode ray tube. More specifically, the present invention relates to a correction method for correcting the gap between the panel inner surface and the color selection electrode, that is, the so-called grill height GH within the standard when the support spring is welded to the color selection electrode.

[0002]

2. Description of the Related Art In a color cathode ray tube used for a television receiver, a monitor television of a computer, etc., three primary colors (R,
G, B) A color selection electrode, for example, an aperture grill having a large number of slits is attached to the inside of a panel coated with a phosphor screen composed of a phosphor layer of G, B), and electrons for three primary colors emitted from an electron gun are attached. The beam is configured to pass through the slit of the aperture grille and illuminate the phosphor layer of the corresponding color on the phosphor screen.

The aperture grill includes a pair of support members and a pair of support members.
It is composed of a frame formed by a pair of elastic imparting members into a substantially rectangular frame shape, and a thin plate-like electrode structure (so-called grill) stretched on the frame, and a large number of slits are formed in this electrode structure. ing.

The attachment of the aperture grill to the panel is
This is done by welding three or four support springs to the frame of the aperture grill and fitting the pin holes of the support springs with the panel pins provided inside the panel.

When the distance between the surface of the electrode structure and the inner surface of the panel, that is, the grill height GH is different from the design value with the aperture grill attached to the panel, the electron beam passing through the slit of the aperture grill corresponds to the fluorescent surface. The color phosphor layer is not accurately irradiated, which causes a defect such as color shift in the completed color cathode ray tube.

Even when the position of the panel pin with respect to the inner surface of the panel and the welding position of the support spring with respect to each member of the frame of the aperture grill are accurate, if the electrode structure is twisted due to distortion of each member, the panel If the inner surface of the panel also has manufacturing variations, the grill height GH between the inner surface of the panel and the surface of the aperture grill deviates from the designed value depending on the location.

Therefore, conventionally, the welding position of the support spring is corrected so that the grill height GH between the inner surface of the panel and the surface of the aperture grill is kept within a predetermined standard value without depending on the fluctuation of the panel and the aperture grill. I am trying to do it.

Therefore, the following correction method has been conventionally used. First, in the panel, the point Z ₀ corresponding to the central portion of the inner surface and the points Z ₁ , Z ₂ , Z ₃ , Z ₄ corresponding to the portions near the four corners are set as the management points of the grill height GH. Also in the aperture grill,
The point Z ₀ at the center and the points Z ₁ , Z ₂ , Z ₃ , corresponding to the four corners correspond to the control points on the panel.
Let Z ₄ be the management point. And

In step 1, management points Z ₀ , Z ₁ ,
The positions of the inner surface of the panel and the surface of the aperture grill at Z ₂ , Z ₃ and Z ₄ are measured. In step 2, the twist when combining each panel and the aperture grille is calculated from the measurement data at the control points Z ₁ , Z ₂ , Z ₃ , Z ₄ , and the grille height GH that does not fall within the standard value is Eliminate as defective. In step 3, the measurement data of the management points Z _{1 to} Z ₄ is used to determine each management point Z.
Calculate the grill height GH at the central control point Z ₀ when minimizing the deviation of the grill height GH between _{1 to} Z ₄ , and exclude those that do not fall within the standard values as defective products. To do. In Step 4, above Step 2
And if the conditions within the specifications of step 3 are met, adjust the position of the aperture grille in the panel and weld the support springs.

[0010]

By the way, in the above step 3, the grill height G at the control points Z _{1 to} Z ₄ is set.
When the position of the aperture grill is adjusted so that the amount of displacement of H is minimized, it varies depending on the material manufacturer and lot, but it is often eliminated due to an error in the curvature R due to twisting of the panel inner surface and the surface of the aperture grill. , The production yield was bad.

In view of the above points, the present invention provides a correction method in the manufacture of a cathode ray tube which can reduce the ratio of rejecting both the panel and the color selection electrode as defective products.

[0012]

SUMMARY OF THE INVENTION The present invention, when welding a support spring to a color selection electrode, corrects the welding position so that the distance between the panel inner surface of the cathode ray tube and the color selection electrode is within the standard. In the correction method, the points corresponding to the central portion of the screen of the color selection electrode and the panel and the points corresponding to a plurality of parts near the periphery are set as control points, and the surroundings corresponding to the twist of the color selection electrode and the panel are set. A first deviation amount obtained by evenly dividing the distance from the design value at the control point closer to the control point is calculated, and a second deviation amount from the design value of the distance at the control point at the central portion is calculated. The welding position of the support spring is corrected so that the second deviation amount falls within the standard.

A first deviation amount obtained by equally dividing the design value of the spacing at each control point in the portion near the color selection electrode and the panel from the design value of the spacing at the control point at the center is used as a second value. The shift amount is calculated, and the welding position of the support spring is corrected so that the second shift amount falls within the standard within the first shift amount standard. Can be reduced.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION First, the structure of a color selection electrode that constitutes a cathode ray tube, an aperture grill in this example, and a panel that supports the aperture grill inside will be described.

As shown in FIGS. 2 and 3, the aperture grill 2 includes a pair of support members 3 and 4, and a frame 7 formed by a pair of elastic imparting members 5 and 6 into a substantially rectangular frame shape. , A thin metal plate-like electrode structure (so-called grill) 8 stretched over the frame 7, and a large number of slits 9 are formed in the electrode structure 8. The spring holders 15 are welded to the outside of the frame at three or four positions, four positions in this example, so that each spring holder 1
5, support springs 10, 11, 12 for mounting the panel
And 13 are welded. Support springs 10, 11, 1
Pin holes 14 are formed at the tips of 2 and 13.

The panel 1 has panel pins 16, 17, 18 and 19 attached to the inside of the skirt, which are engageable with the pin holes 14 of the support springs 10, 11, 12 and 13, respectively.

The attachment of the panel 1 of the aperture grill 2 is carried out by each of the support springs 10, 11, 12 and 13 so that the grill height GH between the surface of the aperture grill 2 and the inner surface of the panel 1 is within the standard for the entire screen. The base is welded to the spring holder 15, and the support springs 10 and 1
By engaging the pin holes 14 of 1, 12 and 13 with the panel pins 16, 17, 18 and 19 of the panel 1,
As a result, the aperture grille 2 is supported inside the panel 1.

Next, the correction method of this embodiment will be described with reference to the flow chart of FIG. 1 and FIGS.

In this example, the panel 1 shown in FIG.
As shown in A and B, the point Z corresponding to the center of the screen on the inner surface
₀And corresponding to the surroundings, for example, the parts near the four corners
Point Z ₁, Z_Two, Z_Three, Z_FourThe grill height GH [G
H₀, GH₁, GH_Two, GH _Three, GH_Four] (See Figure 6)
Management point. In addition, the color selection electrode aperture
For the chagrill 2 as well,
A point in the center of the screen to correspond to the management point of Rule 1.
Z₀Corresponding to the parts around and around, for example, the parts near the four corners
Point Z₁, Z_Two, Z_Three, Z_FourGrill height GH [G
H₀, GH₁, GH_Two, GH_Three, GH_Four] Management Point
And

The control point Z at the center of the panel 1
The measured data P ₀ , P ₁ , P ₂ , P ₃ , P ₄ of the control points Z _{1 to} Z ₄ near ₀ and the four corners are obtained (step S ₁ ). The measurement data P _{0 to} P ₄ are basically shown in FIG.
As shown in 0, the heights at the respective control points P _{0 to} P ₄ with respect to the plane including the three panel pins of the panel 1, for example, the panel pins 16, 17, and 18, are measured, and the measured values are
For example, regarding the management point Z ₂ , its measured value a
The difference between ₁ and the design value b ₁ is represented by b ₁ −a ₁ = P ₂ , but in reality, it is directly measured with a value of deviation from the master reference value in which the design value b ₁ is set to 0 by a tracing stylus.

Next, the control port at the center of the aperture grill 2 is shown.
Into Z₀And management point Z near the four corners₁~ Z_FourMeasurement of
Constant data X₀, X₁, X_Two, X_Three, X_Four(Ste
Up S_Two). This measurement data X₀~ X_FourIs basically
As shown in FIG. 11, in the support spring welding device
Three spring pins holding a support spring
For example, with reference to the plane containing the spring pins 21, 22, 23
Each management point P₀~ P _FourMeasure the height at
Measured value, eg control point Z_TwoIf you look at that
Measured value a_TwoAnd design value b_TwoDifference b_Two-A_Two= X_TwoWith
However, in reality, the design value b depends on the probe._TwoTo
Directly with the value of deviation from the master reference value set to 0
Measured.

Next, the management point Z of the panel₁~ Z_Fourso
Measurement data P₁~ P_FourFrom the twist value A of the inner surface of the panel
calculate. Also, the management point Z of the aperture grill₁
~ Z _FourMeasurement data at X₁~ X_FourFrom aperture grill
Calculates the twist value B of (step S_Three). Panel twist
The twist value A is A = P₁−P_Two+ P_Three−P_Four The twist value B of the aperture grill is B = X₁-X_Two+ X_Three-X_Four Can be calculated by

Next, when the panel 1 and the aperture grill 2 are combined, the respective management points Z ₁ and Z near the four corners.
₂ , the grill height GH between the panel 1 and the aperture grill 2 at Z ₃ , Z ₄ [GH ₁ , GH ₂ , GH ₃ , G
It is determined whether or not the deviation amount C of [H ₄ ] from the design value is within the standard value (step S ₄ ). This shift amount C
Is a combination of the panel 1 and the aperture grill 2 and the twists A and B are evenly distributed by ¼ with respect to the respective management points Z _{1 to} Z ₄ , and the respective management points Z _{1 to} Z _{4 are}
It is the amount of deviation from the design value of the grill height GH [GH _{1 to} GH ₄ ] in. That is, it is represented by C = ± (A−B) / 4.

With the combination of the panel 1 and the aperture grill 2, the deviation amount C of the grill heights GH _{1 to} GH ₄ is within the standard value (for example, as shown in FIG. 7, the deviation amount 0 is centered on the standard and within the standard upper and lower limits). If it does not fall into the range, before welding the support springs 10, 11, 12, 13 to the aperture grill 2, remove the aperture grill 2 and the panel 1 from the line, and if the deviation amount C falls within the standard value, , And then proceeds to the next step S ₅ .

In step S ₅ , the central management point Z
It calculates a shift amount F from the design value of Guriruhaito GH ₀ at _0. That is, first, the error D of the management point Z ₀ of the panel 1 and the error E of the management point Z ₀ of the aperture grill 2 are calculated as follows. D = P ₀ − (P ₁ + P ₂ + P ₃ + P ₄ ) / 4 E = X ₀ − (X ₁ + X ₂ + X ₃ + X ₄ ) / 4 where (X ₁ + X ₂ + X ₃ + X ₄ ) / 4, (P ₁ + P
₂ + P ₃ + P ₄ ) / 4 each management point Z ₁ ~
The average value at Z ₄ can be set to 0 by moving the panel 1 and the aperture grill 2 relatively in parallel, so the difference between this average value and P ₀ is calculated as the errors D and E. From the errors D and E, the deviation F from the design value of the grill height GH ₀ at the central management point Z ₀ when the panel 1 and the aperture grill 2 are combined is calculated by the following formula. F = D-E

Next, this shift amount F at the management point Z ₀
Is determined to be within the standard value (step S ₆ ), and if the deviation amount F at the management point Z ₀ is within the standard value as shown in FIG. 7, it is determined to be a good product. , The support springs 10 and 11 for the frame 7 of the aperture grill 1 so that the error of the grill height GH [GH _{1 to} GH ₄ ] at these four control points is minimized by the measurement data of the control points Z _{1 to} Z _4. the welding position of 12, 13 and automatic correction (step S _7), welding the supporting spring. Although the standard value of the displacement amount C at the management points Z _{1 to} Z ₄ and the standard value of the displacement amount F at the management point Z ₀ are actually different, they are easy to understand in FIGS. 7, 8 and 9. Thus, both standard values are shown in agreement.

On the other hand, as shown in FIG.
_If the deviation amount F at ₀ does not fall within the standard, the process proceeds to steps S ₈ and S ₉ .

Conventionally, the measurement data of the management point Z ₀ is used only for confirming whether or not it can be created as a non-defective product. Therefore, as shown in FIG.
_If the deviation amount F of ₀ does not fall within the standard, the panel 1 and the aperture grill 2 are rejected from the line as defective products, and the combination of the panel 1 and the aperture grill 2 is replaced and re-input.

On the other hand, in the present embodiment, even in such a case, the process proceeds to steps S ₈ and S ₉ to correct again to increase the non-defective rate.

That is, step S₈In the management poi
Nt Z₁~ Z_FourGrill height GH [GH₁~ G
H_Four] The margin of deviation C from the design value for the standard value
Calculate G. Management point Z₁~ Z_FourThe standard value at ±
R₁Then, the management point Z₁~ Z _FourTo the standard value in
The surplus amount G to be calculated is calculated by the following formula (see FIG. 8). G = R₁-C

In the next step S ₉ , the welding position of the support spring is moved within the range of the margin G to eliminate the error at the control point Z ₀ , and whether or not it can be within the standard is determined. Determine. That is, assuming that the standard value at the management point Z ₀ is ± R ₂ , it is determined whether or not the error of the management point Z ₀ falls within the range of R ₂ ≧ F−G.

As shown in FIG. 9, within the range of the margin G, Z
By shifting the shift amount C from _{1 to} Z ₄ , when the error of Z ₀ falls within the standard, the support springs 10, 11, 12, 1 for the frame 7 of the aperture grill 2 are supported.
3 of the welding position by automatic correction (Step S _10), welding the supporting springs 10, 11, 12, 13. If the error of the management point Z ₀ still does not fall within the standard, the aperture grill 2 and the panel 1 are rejected from the line as defective products. Then, the combination of the panel 1 and the aperture grill 2 is replaced and re-inserted.

According to the above-described embodiment, at step S ₆ , the management point Z ₀ is automatically corrected when the amount of deviation from the design value of the grill height GH at the management points Z _{1 to} Z ₄ is automatically minimized. even when the error is large defect in further control point Z ₁ calculates the allowance G for standards in to Z _4, the amount of deviation of control point Z ₁ to Z ₄ in the range of allowance G C by correcting the welding position of the supporting spring against which shifts to error management point Z ₀ falls within the management point Z ₀ standard,
It is possible to reduce the proportion of both the panel 1 and the aperture grill 2 that are rejected as defective products, and improve the yield. Incidentally, the defect occurrence rate was about 2% in the past, but in the present embodiment, it was reduced to about 0.3%. In addition, the accuracy required for the panel 1 and the aperture grill 2 can be reduced, and the material can be effectively used.

[0034]

According to the correction method of the present invention, even if the manufacturing variation of the inner surface of the panel or the twisting of the color selection electrode occurs, the distance between the panel and the color selection electrode is designed in the entire screen. So that it can fit within the standard of value,
The welding position of the support spring of the color selection electrode can be corrected. Therefore, it is possible to reduce the ratio of rejecting both the panel and the color selection electrode as a defective product and improve the product yield. Further, this correction can reduce the accuracy required for the panel and the color selection electrode, and enables effective use of materials.

[Brief description of drawings]

FIG. 1 is a flow chart showing a correction method in manufacturing a cathode ray tube according to the present invention.

FIG. 2 is a rear view showing a panel and a color selection electrode constituting a cathode ray tube used for explaining the present invention.

FIG. 3 is a sectional view of FIG. 2;

FIG. 4A Management point Z ₀ in the panel according to the present invention
Is a front view showing the position of the to Z _4. It is sectional drawing of B panel.

5A is a front view showing the positions of management points Z _{0 to} Z _{4 in} the color selection electrode according to the present invention. FIG. It is a side view of a B color selection electrode.

FIG. 6 is an explanatory diagram showing grill heights GH _{0 to} GH ₄ at respective management points used for explaining the present invention.

FIG. 7 is a diagram for describing the present invention.

FIG. 8 is a diagram for describing the present invention.

FIG. 9 is a diagram for describing the present invention.

FIG. 10 is an explanatory diagram of measurement data at a management point of the panel.

FIG. 11 is an explanatory diagram of measurement data at management points of color selection electrodes.

[Explanation of symbols]

1 panel 2 color selection electrodes 10 to 13 Support springs 16 to 19 Panel pins GH [GH _{0 to} GH ₄ ] Grill height Z _{0 to} Z ₄ Control points

Claims (1)

[Claims] 1. A correction method for correcting a welding position so that a distance between a panel inner surface of a cathode ray tube and the color selection electrode is within a standard when a support spring is welded to the color selection electrode, The points corresponding to the central portion of the screen of the color selection electrode and the panel and the points corresponding to a plurality of portions near the periphery are set as management points, respectively, and the management near the periphery according to the twist of the color selection electrode and the panel. The first deviation amount obtained by evenly dividing the distance from the design value at the point is calculated, and the second deviation amount from the design value of the distance at the management point at the central portion is calculated, within the standard of the first deviation amount. The correction method in manufacturing a cathode ray tube, wherein the welding position of the support spring is corrected so that the second deviation amount falls within the standard.