KR0150990B1 - The device of checking panel in a crt - Google Patents

Abstract

The present invention discloses an apparatus for inspecting a defect of a cathode ray tube panel.

Cathode ray tube panel defect inspection apparatus according to the present invention is provided with a bi-linear illumination device having a light source for irradiating the light to the panel to be inspected and transmitted, the light device is provided with a light focusing means is also transmitted to the curvature surface of the panel By constantly irradiating the amount of light to improve the performance and efficiency of the cathode ray tube panel defect inspection.

Description

Cathode Ray Tube Panel Inspection System

1 is a schematic configuration diagram of a typical cathode ray tube.

2 is an illustration of the defects of the cathode ray and the panel generated during the manufacturing process.

Figure 3 (a) is a schematic diagram showing a light transmission type inspection method of the cathode ray tube panel.

(b) is a state diagram of the electrical signal obtained by the inspection method of (a).

Figure 4 (a) is a schematic diagram showing a light reflection type inspection method of the cathode ray tube panel.

(b) is a state diagram of the electrical signal obtained by the inspection method of (a).

5 is a state diagram of an electrical signal desirable for panel defect recognition.

Figure 6 is a schematic perspective view showing the main part of the conventional cathode ray and panel defect inspection apparatus.

Figure 7 is a schematic perspective view showing the main part of the cathode ray tube panel defect inspection apparatus according to the present invention.

FIG. 8 is a schematic perspective view of a bi-linear luminaire which is a light source in FIG.

FIG. 9 is a sectional view taken along the line I-I of the twin-pipe luminaire shown in FIG.

FIG. 10 is a sectional view taken along the line II-II of the twin-pipe luminaire shown in FIG.

11 is a schematic cross-sectional view of a light irradiation state for the panel of the device of the present invention.

12 is a state diagram of an electrical signal in which a panel defect is recognized by the apparatus of the present invention.

* Explanation of symbols for main parts of the drawings

10 cathode ray tube 11 panel

12: shadow mask 13: neck part

14 electron gun 15 deflection yoke

31 Transmission fluorescent lamp 32 Black wall

34, 35: rotation guide 36: light emitting lamp

50a, 50b: Belt conveyor 50: Clearance space

51 sensor 52 light source

53: camera 54: support frame

55: stepping motor 80: light source

81: intuitive lamp 84: cover

85: space 86: lens

The present invention relates to a panel inspection apparatus of a cathode ray tube, and more particularly, to recognize various defects interposed on the panel by using illumination emitted from a light source, and to simply recognize dirt or foreign matter attached to the panel, and to substantially interlock the panel. It relates to a panel inspection apparatus of a cathode ray tube for inspecting the presence or absence.

In general, as shown in FIG. 1, the cathode ray tube 10 used as a display device such as a computer monitor or a television has a fluorescent film formed on an inner surface of the panel 11, and an assembly of a shadow mask provided with an electron beam through hole ( 12 is provided in parallel with the fluorescent film, and the neck portion 13 includes an electron gun 14 and a deflection yoke 15.

The cathode ray tube 10 of the above configuration emits an electron beam through the electron gun 14 provided in the neck portion 13, and the emitted electron beam is selectively deflected by the deflection yoke 15 according to the dice of the fluorescent film, An image is formed by passing through the electron beam through hole of the shadow mask and landing on the fluorescent film.

In order to form a good image on the screen of the cathode ray tube, many conditions such as the coincidence state of the fluorescent film pattern formed on the inner surface of the panel, the deflection state of the electron beam, and the bonding state of the shadow mask assembly may be satisfied.

On the other hand, the panel 11 of the cathode ray tube is manufactured by dissolving a glass (molded glass) in a predetermined shape as shown in Figure 2, and then through a series of processes such as polishing, washing and drying. In the actual manufacturing process, as shown in FIG. 2 (a) due to defects in the state of dissolution of glass, blister (1) or foreign matter inflow caused by air inflow during the glass melting process of the cathode ray tube panel Scratches due to inherent defects such as stones (2) and glass knots (3) generated due to the like, or defects in forming and polishing processes as illustrated in FIG. 4) cases of surface defects such as pits 5, wheel marks 6, etc. cannot be completely excluded.

As described above, when the above defects are interposed on the panel of the cathode ray tube, the defects may appear as spots on the screen to distort the image, no matter how good the conditions of the various conditions to be met for the high quality image formation described above. This phenomenon causes a problem that acts as a serious defect in the image formation of the cathode ray tube.

In order to prevent the above problems, in general, the manufacturing site of the cathode ray tube is essentially required to inspect the presence or absence of defects in the panel in the state of manufacturing the panel.

The defect inspection of such a panel is to determine the state of both parts by using the principle that light scattering occurs at a site where a defect is interposed when light is irradiated to a transparent member such as glass or a liquid crystal panel using a light source. There are inspection methods by light transmission and inspection by light reflection as illustrated in FIGS. 3 and 4.

That is, in the inspection by the light transmission illustrated in FIG. 3A, the fluorescent lamp 31 for transmission is installed on the opaque black wall 32, and the panel 11 to be inspected on the front surface thereof is rotated by the guide 34. Installed in such a way that the light irradiated from the fluorescent lamp 31 is diffusely reflected at the defect site, as shown in FIG. 3B, through an output signal such as a voltage profile for the pixel. Is to check for defects.

In addition, the inspection by the light reflection illustrated in FIG. 4 (a) is performed by using the light emitting lamp 36 to irradiate and reflect light to the outer surface of the panel 11 installed to be rotatable by the rotation guide 35. By detecting the amount of light coming in, the defect of the panel 11 is inspected through the output signal of the voltage profile for the pixel as illustrated in FIG. 4B.

The defect inspection of the panel was conventionally performed by visual observation, but this visual inspection had a limitation on the precision, reliability, and productivity of the inspection result according to the difference in the skill of the operator, etc. The inspection equipment used to improve the precision, reliability and productivity of the inspection.

FIG. 6 schematically shows a main part of a conventional cathode ray tube panel defect inspection apparatus equipped with a camera, which is configured to carry a first belt conveyor 50a for conveying the inspection subject panel 11 in one direction as shown in FIG. And a second belt conveyor 50b which is in contact with each other such that a gap space 50c of a predetermined interval is formed. In addition, a light source 52 installed in parallel with the longitudinal direction is provided under the gap space 50c, and a camera 53 in which a charge-coupled device (CCD) is embedded is supported thereon. It is supported by 54.

On the other hand, the light source 52 is provided with a cover 52b provided with a reflecting surface therein and an opening 52c on one side to collect the linear illuminating lamp 52a and light emitted radially therefrom in a predetermined direction. Doing. In addition, a sensing sensor 51 for detecting whether the panel 11 passes through is provided at an end of the first belt conveyor 50a, and the first belt conveyor 50a and the second belt conveyor 50b are provided. A stepping motor 55 is installed between one side surface, and the stepping motor 55 simultaneously drives the first belt conveyor 50a and the second belt conveyor 50b, thereby ensuring uniformity in response to the load variation. do.

As described above, the conventional cathode ray tube panel defect inspection apparatus transfers the inspection target panel 11 to the second belt conveyor 50b through the first belt conveyor 50a. As the panel 11 is transported, it is detected by the sensor 51 installed at the end of the first belt conveyor 50a, and the clearance space formed between the first belt conveyor 50a and the second belt conveyor 50b ( As it passes 50c, the light source 52 irradiates light toward the panel 11. At this time, the camera 53 positioned on the top of the panel 11 recognizes the amount of light transmitted through the panel 11 to detect defects on the panel 11 by the converted electrical signals as shown in FIGS. 3b and 4b. Will be examined.

However, in the conventional panel defect inspection apparatus described above, since the inspection target panel has a constant curvature surface, it is difficult to match the illumination with the camera with respect to this curvature surface, and the panel has a rough inner surface, so that light scattering In some cases, since the signal input to the camera shows the shape of noise, there was a problem that the inspection performance is reduced.

Accordingly, the present invention has been made in view of the above-described problems, and an object of the present invention is to form a light source that bisects a light source through which light is irradiated and transmitted to a panel to be inspected, and a light converging means is provided thereon The amount of light transmitted through the curvature surface of the device is uniformly irradiated, thereby inducing an electrical signal of a form suitable for panel defect recognition as shown in FIG. 5 to improve the performance and efficiency of panel defect inspection. It is to provide a defect inspection apparatus of the cathode ray tube panel.

The defect inspection apparatus of the cathode ray tube panel of the present invention for achieving the above object,

A cathode ray tube panel inspection apparatus comprising a light source for irradiating light toward a cathode ray tube panel and photoelectric conversion means for converting an electrical signal by receiving light quantity information transmitted through the panel,

The light source is

A pair of intuitions arranged next to each other;

Lamps each received in the straight pipe;

A cover provided at one side of the straight pipe to focus and pass the path of the light emitted from the lamp in one direction to form a space passage; And a light concentrating means installed on the cover to be positioned at an end of the space passage.

In the cathode ray tube panel inspection apparatus according to the present invention, the light converging means is preferably an optical lens formed in a cylindrical shape to have a curvature surface corresponding to the curvature surface of the panel. According to this structural feature, the amount of light irradiated from the light source corresponding to the curvature surface of the panel can be irradiated in a constant state. In addition, it is preferable that a light reflecting material is coated inside the straight pipe and the cover.

Hereinafter, a preferred embodiment of the present invention cathode ray tube panel defect inspection apparatus will be described in detail with reference to the accompanying drawings.

First, in the drawings for explaining the present invention, Figure 7 is a schematic perspective view showing the main portion of the cathode ray tube panel defect inspection apparatus according to the present invention, Figure 8 is an excerpt of the bi-linear luminaire which is a light source in Figure 7 One schematic perspective view. 9 is a sectional view taken along the line I-I of the twin linear luminaire shown in FIG. 8, and FIG. 10 is a sectional view taken along the line II-II of the bi-linear lighting fixture shown in FIG. 11 is a schematic sectional view of the light irradiation state with respect to the panel of the apparatus of the present invention, and FIG. 12 is a state diagram of an electrical signal in which a panel defect is recognized by the apparatus of the present invention.

Referring to the drawings, the cathode ray and panel defect inspection apparatus according to the present invention is provided with a first belt conveyor (50a) for transporting the panel to be inspected in one direction, and at the same time there is a gap space (50c) of a predetermined interval The second belt conveyor 50b which abuts each other is provided so that it may be formed. In addition, a light source 80 provided in parallel with the longitudinal direction is provided under the gap space 50c, and a camera 53 in which a charge-coupled device (CCD) is built is supported thereon. It is supported by 54.

In addition, a sensing sensor 51 for detecting whether the panel 11 passes through is provided at an end of the first belt conveyor 50a, and the first belt conveyor 50a and the second belt conveyor 50b are provided. Between the one side is provided with a stepping motor 55 for controlling the first belt conveyor (50a) and the second belt conveyor (50b) to be driven with the same properties as the load changes.

On the other hand, the light source 80 is provided with a lamp 81 in two straight pipes installed side by side as a component to characterize the device of the present invention, in order to collect the optical path of the light emitted from the lamp 81 in one direction A cover 84 having a predetermined space portion 85 through which light is applied while reflecting material is applied therein is provided.

In addition, at the end of the space portion 85 formed in the cover 84, a cylindrical lens 86 for condensing light so that the amount of light transmitted and transmitted from the light source 80 with respect to the curvature surface of the panel 11 is constant. ) Is provided.

The panel defect inspection apparatus of the present invention configured as described above transfers the inspection target panel 11 to the second belt conveyor 50b side through the first belt conveyor 50a. As the panel 11 is conveyed, the conveying state is detected by a sensor 51 installed at the end of the first belt conveyor 50a, and between the first belt conveyor 50a and the second belt conveyor 50b. When passing through the formed gap space 50c, the light source 80 irradiates light toward the panel 11. At this time, the CCD camera 53 located above the panel 11 recognizes the amount of light transmitted through the panel 11 and inspects the defect of the panel 11 by the converted electrical signal as shown in FIG. Done.

Here, in the state of the electrical signal shown in FIG. 3b, the recognition range A is largely output in determining whether the inspection object is defective, but B is less. In the state of the electrical signal shown in FIG. 4b, the recognition width B is shown. The output is large, but the output A is low, so it is difficult to distinguish between defects that are the inspection targets of the panel and dust, foreign matters, or microscopic defects.

On the other hand, the apparatus of the present invention doubles the amplification and linearity of the light through the light irradiation state as shown in FIG. 11, thereby increasing the amount of light reflected and refracted by the panel defects. As shown in FIG. 2, both of the recognition widths A and B are largely output. This coincides with the state of the electrical signal desirable for the panel defect recognition shown in FIG. 5, and it is possible to distinguish and inspect the defect state to be inspected by the panel more precisely and efficiently.

As described above, the cathode ray tube panel defect inspection apparatus according to the present invention is provided with a bi-linear illumination device that includes a light source for irradiating and transmitting light to a panel to be inspected, and the illumination device includes a light focusing means for By making the amount of light transmitted through the curvature surface constant, the effect of improving the performance and efficiency of the cathode ray tube panel defect inspection can be obtained.

Claims (3)

In a cathode ray tube panel inspection apparatus comprising a light source for irradiating light toward a cathode ray tube panel and photoelectric conversion means for converting an electrical signal by receiving light quantity information transmitted through the panel, the light sources are parallel to each other. A pair of intuition provided; Lamps 81 respectively received in the straight pipes; A cover 84 provided on one side of the straight pipe to focus and pass a path of light emitted from the lamp in one direction to form a space passage 85; And a light focusing means installed on the cover to be located at the end of the space passage. The defect inspection apparatus according to claim 1, wherein the light converging means is an optical lens (86) formed in a cylindrical shape to have a curvature surface corresponding to the curvature surface of the panel. The defect inspection apparatus of claim 1, wherein a light reflecting material is coated inside the straight pipe and the cover.