KR0142029B1 - Positioning method for holder spring of crt and device thereof - Google Patents

Abstract

The present invention discloses a novel holder spring height measuring method and a device suitable for implementing the same.

The height of the support hole of the holder spring determines the actual distance between the panel and the shadow mask, so precise management is required. For this purpose, in the past, the measurement was performed using a height gauge or the like, and the center of the support hole was dependent on visual perception so that accurate measurement was not possible.

In the present invention, the dial gauge is installed on the measuring instrument body, and the probe is coupled to its spindle and the tip is horizontally bent, and after zeroing the dial gauge in a state where the probe is positioned at a predetermined reference position, the probe is held in a holder. Insertion into the support hole of the spring allows accurate measurement of the support hole height. (Figure 2)

Description

Holder spring height measuring method and device

1 is a partially enlarged cutaway side view schematically showing the color cathode ray tube,

2 is a perspective view schematically showing a measuring apparatus according to the present invention,

Figure 3 (a) (b) is an excerpt side view showing the state of use of the measuring device of the present invention.

Explanation of symbols used in the main part of the drawing

20: measuring instrument

24: dial gauge

25: Probe

30: setting gauge

32: gauging hole (setting gage)

MF: mask-frame assembly

HS: holder spring (of mask frame assembly)

H: support hole (holder spring)

The present invention relates to the production of color cathode ray tubes, and more particularly, to a method for measuring the position of a holder spring for holding a mask-frame assembly to a panel. It relates to a device suitable for implementing this.

In FIG. 1, the color cathode ray tube T produces an image by selectively landing an electron beam emitted from an R, G, B electron gun assembly A by means of color screening to a corresponding phosphor on a fluorescent surface. It is a device to display. A shadow mask (SM) is generally used as the color sorting means. Since it is a porous thin film having a myriad of color discriminating apertures, it is usually bonded to the frame F to form a mask frame assembly ( MF) in the cathode ray tube T.

On the other hand, since the shadow mask SM is also used as an exposure mask for manufacturing a fluorescent surface of the panel P, the shadow mask SM is combined and dismantled several times with respect to the panel P during the manufacturing process of the cathode ray tube T. To this end, a stud pin (SP) is installed on the inner surface of the skirt of the panel (P), and a holder spring (HS) having a corresponding support hole (H) formed on the frame (F) is attached to the mask. It is common to elastically support the frame assembly MF to the panel P. FIG.

Accordingly, the relative position of the holder spring HS with respect to the frame F, that is, the height of the support hole H into which the stud pin SP of the panel P is inserted, is determined by a cathode ray tube such as fluorescent screen formation and image quality of a display image. Since the so-called q value, which is the distance between the shadow mask SM and the panel P, which determines the quality of T), is substantially determined, it must be managed very precisely with the q value.

The conventional method for this is to mount the mask frame assembly (MF) on the surface plate and the operator measures the height between the lower surface of the frame (F) and the holder spring (HS) support hole (H) with a measuring instrument such as a height gauge (height gauge). It was managed by.

However, the support holes H of the stud pins SP and the holder springs HS are generally formed in a mutually corresponding circular shape, and according to a conventional measuring method, the center of the support holes H is determined by visual perception. There was no choice but to measure. Accordingly, it is not only impossible to accurately measure the height of the support hole (H) of the holder spring (HS) with respect to the frame (F), there was a problem that the measurement operation is very difficult. In addition, the measurement value is different depending on the worker, and the measurement error is so severe that the inadequate process of the inadequately inadequate product has been left unattended. As a result, the quality and reliability of the finished cathode ray tube are deteriorated. Could not be guaranteed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a holder spring height measuring method capable of simply and accurately measuring the height of a support hole of a holder spring for a frame in view of these conventional problems.

Another object of the present invention is to provide a measuring device suitable for implementing the above-described method.

In order to achieve the first object described above, the holder spring height measuring method according to the present invention includes a probe connected to a measuring device, and after setting the measuring device to zero at a predetermined reference position, the probe is held in a holder spring. It is characterized in that it is inserted into the support hole.

Holder spring height measuring apparatus according to the present invention for measuring the height of the support hole of the holder spring of the mask frame assembly, in order to achieve the second object described above, the dial extending downward to be movable and fixed to the measuring instrument body And a probe having a front end bent horizontally so that the gauge is coupled to the spindle of the dial gauge and inserted into the support hole of the holder spring.

According to one preferred feature of the present invention, a setting gauge having a plurality of gauging holes corresponding to the heights of the support holes of the holder springs of the plurality of mask frame assemblies is provided, and a zero point is adjusted by inserting a probe into the gauging hole. .

Accordingly, the present invention can accurately measure the height of the support hole of the holder spring for the frame, thereby exhibiting a great effect in improving the production efficiency and reliability of the cathode ray tube.

Specific features and other advantages of the present invention will become more apparent from the following description of the preferred embodiments with reference to the attached drawings.

In FIG. 2, the holder spring height measuring device according to the present invention basically has a surface plate 10 so as to carry out a measurement operation by mounting a mask frame assembly MF, thereby providing stable measurement on the surface plate 10. In order to mount and support the mask frame assembly MF, a plurality of support blocks 11 are positioned. Preferably, the support block 11 can be moved to any position on the surface plate 10 to support the mask frame assembly (MF) of various tubular types.

On the other hand, on the surface 10 is provided with a measuring device 20 for measuring the height of the support hole (H) of the holder spring (HS) of the mask frame assembly (MF). The measuring device 20 has a guide rod 22 installed vertically upward on the support block 21, and a support plate 23 is installed on the guide rod 22 so as to be movable and fixed. In the support plate 23, a dial gauge 24 is installed downward in accordance with a feature of the present invention, and a spindle thereof is inserted into the support hole H of the holder spring HS to measure its height. Probe 25 is bent with its tip bent horizontally.

On the other hand, the present invention is preferably provided with a setting gauge (30) to zero the dial gauge 24 in a state in which the probe 25 of the measuring device 20 is positioned at a predetermined reference position. The setting sage 30 may be configured in various forms. Preferably, the setting sage 30 has a plurality of crabs corresponding to the heights of the holder springs HS supporting holes H of the mask frame assemblies MF. It is configured by forming a gauging hole (32). Immediately, the gauging hole 32 has different heights a to e from the reference surface 31 in contact with the support block 11 on which the frame F is seated. The remaining reference numeral 26 is an adjusting knob of the dial gauge 20.

A method of measuring the height of the holder spring with the measuring device according to the present invention configured as described above will be described with reference to FIG.

First, as shown in FIG. 3 (a), the setting gauge 30 is mounted on the supporting block 11, the measuring device 20 is moved in the direction of the solid arrow, and the supporting plate 23 is guided ( 22), the probe 25 is inserted into one gauging hole 32 of the setting gauge 30 as shown in the phantom line. In this state, after setting the dial gauge 20 to o through the adjusting knob 26, the measuring device 20 is moved in the direction of the image table of the dotted line, and the probe 25 is moved to the gauging hole of the setting gauge 30. Separate from (32).

Next, as shown in FIG. 3 (b), the setting gauge 30 is removed from the support block 11 and the mask frame assembly MF to be measured is seated on the support block 11. Subsequently, the measuring device 20 is moved in the direction of the image table of the solid line, and the probe 25 is inserted into the support hole H of the holder spring HS. At this time, if the guide of the dial gauge 24 does not move, the support hole H is correctly positioned at a predetermined position, and if the guide moves forward or reverse, the support hole H is eccentrically moved upward or downward. . Next, the measuring device 20 is moved in the direction of the dotted arrow to separate the probe 25 from the support hole H of the holder spring HS, and then the support hole H of the remaining holder springs HS in the above-described manner. ) Measure the height sequentially. In this way, the measured value is compared with the set tolerance value by the operator to determine whether or not.

As described above, according to the present invention, since the height of the support hole is measured through a probe corresponding to the support hole of the holder spring, the measurement operation is much simpler and more accurate than in the related art. Accordingly, it is possible to prevent post-process introduction of nonconforming products as in the prior art.

Therefore, the present invention has the effect of greatly improving the production efficiency and reliability of the cathode ray tube.

Claims (4)

In the method for measuring the height of the support hole of the holder spring of the mask frame assembly, With a probe connected to the meter, Holder spring height measuring method, characterized in that the probe is inserted into the support hole after the measuring device is set to zero in the state where the probe is located at a predetermined reference position. The method of claim 1, By forming a plurality of gauging holes corresponding to the height of the support hole of the holder spring of the mask frame assembly of a plurality of kinds, A holder spring height measuring method, characterized in that the measuring device is set to zero by selectively inserting the probe into the plurality of gauging holes. In the apparatus for measuring the height of the support hole of the holder spring of the mask frame assembly, A dial gauge 24 extending downwardly to be movable and fixed to the body of the measuring device 20 and coupled to a spindle of the dial gauge 24 may be inserted into a support hole H of the holder spring HS. The probe 25 is bent horizontally so that the tip is Holder spring height measuring apparatus, characterized in that comprising a. The method of claim 3, And a setting gauge 30 having a plurality of gauging holes 32 corresponding to the heights of the supporting holes H of the holder springs HS of the plurality of mask frame assemblies MF, Holder spring height measuring apparatus, characterized in that the zero adjustment by inserting the probe (25) into the gauging hole (32).