KR100775826B1 - Inner shield for slim type cathode ray tube - Google Patents

Abstract

Inner shield of the slim cathode ray tube according to the present invention, L is the vertical distance from the deflection center in which the electron beam emitted from the electron gun starts to be deflected by the deflection yoke, the plane formed by the seal surface of the funnel is L, the inside of the funnel The distance between both openings of the inner shield provided at the shutter is Sh, the long axis length of the electron gun side opening of the inner shield is Dx, the short axis length of the electron gun side opening is Dy, the short side bending angle is Sγ and the long side bending angle is Lγ. When the deflection angle is Dθ, 2 <L / Sh <3.5, 1.6 <Dx / L <3.5, 1.0 <Dy / L <2.5, 2.5 <Dθ / Sγ <6.5, 1.0 <Dθ / Lγ <3.0 When formed to satisfy the slim cathode ray tube, interference with the funnel does not occur, thereby improving the assemblability, preventing the halation that may be caused by the overscanned electron beam, and also causing shadow problems on the screen. It is effective to solve .

Electron Beam, Tube, Slim, Halation, Overscan, Opening

Description

Inner shield for slim type cathode ray tube

1 is a plan view of a partially cut away state showing a cathode ray tube of the prior art,

2 is a schematic plan view showing a slim cathode ray tube according to the present invention;

3 is a plan view showing the inner shield of the slim cathode ray tube according to the present invention;

Figure 4 is a rear view showing the inner shield of the slim cathode ray tube according to the present invention,

5 is a side view illustrating an inner shield of a slim cathode ray tube according to the present invention.

<Explanation of symbols for the main parts of the drawings>

20: tube 21: panel

23: Funnel 25: Mask

27: frame 30: inner shield

30f, 30r: opening 31: long side

33: short side

L: Straight distance from the deflection center (C) to the plane of the threaded edge of the funnel

Sh: Distance between both openings of inner shield Dx: Long axis length of electron gun opening

Dy: short axis length of the electron gun side opening Sγ: short side bending angle

Lγ: Long side bending angle Dθ: Deflection angle

The present invention relates to an inner shield of a cathode ray tube, and more particularly to an inner shield that can be applied to a slim cathode ray tube having a deflection angle of 110 degrees or more.

In general, a cathode ray tube is an apparatus that forms an electrical signal as an electron beam, scans it onto a fluorescent surface, and converts it into an optical image for display.

1 is a plan view of a partially cut away state in which a cathode ray tube of the prior art is shown.

As shown in the drawing, the cathode ray tube is largely joined to the panel 1 and the funnel 2 to form the tube 10.

A shadow mask 3 is provided inside the panel 1, which is supported by a frame 4 so as to be substantially parallel to the panel 1, and this frame 4 is provided. ) Is installed on the panel 1 via a spring 5. The inner side of the funnel 2 is provided with an inner shield 6 which blocks the external geomagnetic field so that the electron beam is not bent by the external geomagnetic field.

An electron gun 7 for generating an electron beam is inserted in the rear of the funnel 2, and a deflection yoke 8 for deflecting the electron beam to approximately 110 degrees or less is provided outside the neck portion.

In this cathode ray tube, the electron beam emitted from the electron gun 7 is deflected up and down and left and right by the deflection yoke 8 and proceeds toward the panel 1, and passes through the through hole of the shadow mask 3. Next, the fluorescent surface 9 coated on the inner surface of the panel 1 is reached. At this time, the image is reproduced by the fluorescent surface 9 emitting light by the energy of the electron beam, so that the user can see the reproduced image through the panel 1.

Meanwhile, in the cathode ray tube as described above, the seal surface E of the panel 1 and the funnel 2 is bonded to each other through a frit sealing process, and then the electron gun 7 is formed at the end of the funnel 2 in the encapsulation process. After inserting, the tube 10 is made into a vacuum state through an exhaust process, and then sealed and manufactured.

As the cathode ray tube becomes slimmer, the deflection angle increases to 110 degrees or more, as compared with the conventional cathode ray tube structure, so that the inner and outer walls of the inner shield 6, the funnel 2, and the panel 1 of the electron beam are scanned. The collision of secondary electrons causes a halation problem.

In addition, if the inner shield 6 does not set an opening having an appropriate size, the inner shield 6 may cause a problem of shadowing on the screen while hitting the inner shield 6 during the overscan of the electron beam.

That is, when the conventional inner shield 6 is applied to the slim cathode ray tube with the deflection angle increased to 110 degrees or more, the opening size of the inner shield 6 is such that the shadow of the electron beam emitted from the electron gun 7 does not interfere. It is essential to allow the phosphor to emit light through the outermost through hole of the mask 3.

However, if the opening size of the inner shield 6 is too small, shadows are generated, and if the opening size is too large, the electron beam is reflected on the inclined surface to generate a halation. In addition, if the height of the inner shield 6 is greater than or equal to a certain height, interference occurs in the funnel 2, and if it is too low, the overscanned electron beam hits the inner surface of the funnel 2 and the reflected secondary electron beam is reflected. Halation will occur. In addition, when the bending angle of the inner shield 6 is out of a predetermined range with respect to the deflection angle, the electron beam emitted from the electron gun 7 is reflected on the inner surface of the inner shield 6 to generate a halation.

Therefore, it is necessary to select and design the optimal value as the inner shield 6 height, the opening size, the bending angle variable and the distance ratio of the deflection center are increased so that the inner shield 6 can be applied to the slim cathode ray tube. .

The present invention has been made in accordance with the requirements as described above, to solve the problem of halation and shadows on the screen to be applied to the cathode ray tube with a deflection angle of 110 degrees or more, and the slim type that can improve the assembly The purpose is to provide an inner shield of the cathode ray tube.

Inner shield of the slim cathode ray tube according to the present invention for realizing the above object, the vertical distance from the deflection center in which the electron beam starts to be deflected by the deflection yoke to the plane formed by the seal surface of the funnel is referred to as L, When the distance between both openings of the inner shield provided inside the funnel is Sh, the inner shield is characterized in that the ratio of the distance between the openings according to the vertical distance satisfies 2 <L / Sh <3.5.

In addition, the inner shield of the slim cathode ray tube according to the present invention for realizing the above-mentioned problem, the vertical distance from the deflection center at which the electron beam starts to be deflected by the deflection yoke to the plane formed by the seal surface of the funnel is referred to as L. When the long axis length of the electron gun side opening is Dx and the short axis length Dy of both openings of the inner shield provided inside the funnel, the inner shield is 1.6 <Dx / L <3.5 and 1.0 <Dy / L. <2.5 is satisfied.

In addition, the inner shield of the slim type cathode ray tube according to the present invention for realizing the above-mentioned problems, Sγ, and the long side bending angle which forms the short side bending angle which the plane formed by the electron gun side opening part of both inner openings of the inner shield makes with the short side, Is Lγ, and when the deflection angle maximizing deflection from the deflection center at which the electron beam starts to deflect by the deflection yoke is Dθ, the inner shield is 2.5 <Dθ / Sγ <6.5 and 1.0 <Dθ / Lγ <3.0. It is characterized by being satisfied.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

2 is a schematic plan view showing a slim cathode ray tube according to the present invention.

As shown in this, the slim cathode ray tube according to the present invention, the panel 21 and the funnel 23 are bonded to each other in a state where the seal surface (E) is abutted to form a tube 20, the tube 20 ), A shadow mask 25, a frame 27 for fixing the shadow mask 25 to the panel 21, and an inner shield 30 installed inside the funnel 23 to shield the external geomagnetic field. It is provided.

Here, the slim cathode ray tube is configured such that the deflection angle (2Dθ) of the electron beam is 110 degrees or more, and the inner shield 30 is a halation problem and shadow problem that may occur when the cathode ray tube is made slim. It is formed to solve.

3 to 5 are views showing the inner shield of the present invention that can solve the problems as described above, Figure 3 is a plan view of the inner shield, Figure 4 is a rear view of the inner shield, Figure 5 is a side view of the inner shield to be.

As shown therein, the inner shield 30 is formed in a substantially square pyramid structure in which a circumferential surface is inclined, and openings 30f and 30r are formed to pass electron beams through the front and rear surfaces, respectively.

Here, referring to FIG. 2, the vertical distance from the deflection center C at which the electron beam starts to be deflected by the deflection yoke to the plane formed by the seal surface E of the funnel 23 is referred to as L, and the inner shield ( When the distance between both openings of 30 is Sh, the inner shield 30 is formed to satisfy 2 < L / Sh < 3.5.

When the major axis length of the electron gun side opening portion 30f of the inner shield 30 is referred to as Dx and the short axis length is referred to as Dy, the inner shield 30 has 1.6 <Dx / L <3.5 and 1.0 <Dy. / L <2.5.

In addition, the short side bending angle formed by the plane formed by the panel side opening 30r of the inner shield 30 and the short side 33 is referred to as Sγ, and the plane and long side 31 formed by the panel side opening 30r are If the long side bending angle is Lγ, and the deflection angle maximizing deflection from the deflection center C of the electron beam is Dθ, the inner shield 30 has 2.5 <Dθ / Sγ <6.5 and 1.0 <Dθ / Lγ <3.0 It is formed to satisfy.

As described above, the inner shield 30 has the height Sh and the electron gun opening 30f length Dx and Dy at the deflection centers of the bending angles Lγ and Sγ of the short sides 33 and the long sides 31. By increasing the vertical distance (L) and deflection angle (Dθ) of the ratio is formed to the optimum value that can be applied to the slim cathode ray tube.

Specific embodiments of the inner shield of the slim cathode ray tube according to the present invention configured as described above will be described through the following table.

First, the conventional inner shield is formed of Dθ, L, Sh, Dx, Dy, Sγ, and Lγ of 50, 241, 140, 317, 172, 37.6 to 43, 57.5 to 66, respectively, and thus, L / Sh, Dx / L, Dy / L, Dθ / Sγ, Dθ / Lγ are 1.7, 1.3, 0.7, 1.2 to 1.3, 0.8 to 0.9, respectively, and when applied to a slim cathode ray tube with a wide angle of angle of 2Dθ of 110 degrees or more. The electron beam emitted from the gun hits the inner shield, causing a fatal problem with shadows on the screen.

On the other hand, the inner shield of the first embodiment of the present invention is formed by Dθ, L, Sh, Dx, Dy, Sγ, Lγ is 60, 172, 65, 282, 180, 20 ~ 24, 40 ~ 46, respectively, L / Sh, Dx / L, Dy / L, Dθ / Sγ, Dθ / Lγ were 2.6, 1.6, 1.05, 2.5-3.0, and 1.3-1.5, respectively.

Inner shield of Example 2 of the present invention is formed by Dθ, L, Sh, Dx, Dy, Sγ, Lγ is 62.5, 133, 59, 264, 170, 13-18, 30-35, respectively, L / Sh, Dx / L, Dy / L, Dθ / Sγ, and Dθ / Lγ were 2.3, 2.0, 1.3, 3.5 to 4.8, and 1.8 to 2.1, respectively.

Inner shield of the third embodiment of the present invention is Dθ, L, Sh, Dx, Dy, Sγ, Lγ is formed by 65, 123, 52, 258, 166, 12 ~ 17, 25 ~ 29, respectively, L / Sh, Dx / L, Dy / L, Dθ / Sγ, and Dθ / Lγ were 2.4, 2.1, 1.3, 3.8 to 5.4, and 2.3 to 2.6, respectively.

Inner shield of Example 4 of the present invention is formed by Dθ, L, Sh, Dx, Dy, Sγ, and Lγ are 70, 80, 30, 220, 142, 11 to 13, 23 to 26, respectively, Dx / L, Dy / L, Dθ / Sγ, and Dθ / Lγ were 2.7, 2.8, 1.8, 5.5 to 6.4, and 2.6 to 3.0, respectively.

Therefore, the inner shield 30 formed according to each embodiment of the present invention as described above to form the L / Sh ratio to satisfy the 2 ~ 3.5, so that when applied to the slim cathode ray tube can be mounted in the tube 20 When the interference with the funnel 23 is not generated, the assemblability is improved, and the halation that can be generated by the overscanned electron beam can be prevented.

In addition, the inner shield 30 of the present invention forms Dx / L and Dy / L to satisfy 1.6 to 3.5 and 1.0 to 2.5, respectively, and Dθ / Sγ and Dθ / Lγ are 2.5 to 6.5, By forming so as to satisfy 1.0 to 3.0, the lengths Dx and Dy of the electron gun side opening 30f are appropriately set so that the electron beam emitted from the electron gun interferes with the electron gun side opening 30f when applied to the slim cathode ray tube. Since the electron beam passes through the shadow mask 25 and emits the phosphor of the panel 21, the electron beam hits the inner shield 30 so that the shadow on the screen can be solved. do.

The inner shield of the slim cathode ray tube according to the present invention constructed and acted as described above is configured by appropriately setting the height Sh and the size of the openings Dx and Dy, so that interference with the funnel occurs when applied to the slim cathode ray tube. As a result, assemblability may be improved, a halation that may be generated by the overscanned electron beam may be prevented, and a shadow problem generated on the screen may be solved.

Claims (9)

When the vertical distance from the deflection center in which the electron beam starts to deflect by the deflection yoke to the plane of the threaded surface of the funnel is referred to as L, and the distance between both openings of the inner shield provided in the funnel is referred to as Sh, The inner shield is the inner shield of the slim cathode ray tube, characterized in that the ratio of the distance between the two openings according to the vertical distance satisfies 2 <L / Sh <3.5. The method of claim 1, When the major axis length of the electron gun side opening part of both opening parts of the inner shield is Dx, The inner shield is an inner shield of a slim cathode ray tube, characterized in that 1.6 <Dx / L <3.5. The method according to claim 1 or 2, When the short axis length of the electron gun side opening of both openings of the inner shield is Dy, The inner shield is an inner shield of a slim cathode ray tube, characterized in that it satisfies 1.0 <Dy / L <2.5. The method of claim 1, If the short side bending angle between the plane formed by the panel side opening and the short side among the openings of the inner shield is Sγ, and the deflection angle maximally deflecting from the deflection center is Dθ, The inner shield of the slim cathode ray tube, characterized in that formed to satisfy 2.5 <Dθ / Sγ <6.5. The method according to claim 1 or 4, When the long side bending angle between the plane formed by the panel side opening and the long side among the openings of the inner shield is referred to as Lγ, and the deflection angle to achieve the maximum deflection from the deflection center is Dθ, The inner shield of the slim cathode ray tube, characterized in that formed to satisfy 1.0 <Dθ / Lγ <3.0. The vertical distance from the deflection center at which the electron beam starts to deflect by the deflection yoke to the plane of the inner surface of the funnel seal is L, and the length of the long axis of the electron gun opening of the inner shields of the inner shield provided inside the funnel Dx and shortening length Dy, The inner shield is 1.6 <Dx / L <3.5 and the inner shield of the slim cathode ray tube, characterized in that it satisfies 1.0 <Dy / L <2.5. The method of claim 6, A short side bending angle formed by the plane and the short side formed by the electron gun side opening is Sγ, and a deflection angle maximizing deflection from the deflection center is Dθ, The inner shield is an inner shield of a slim cathode ray tube, characterized in that 2.5 <Dθ / Sγ <6.5. The method according to claim 6 or 7, A long side bending angle formed by the plane and the long side formed by the electron gun side opening is Lγ, and a deflection angle maximizing deflection from the deflection center is Dθ, The inner shield is an inner shield of a slim cathode ray tube, characterized in that it satisfies 1.0 <Dθ / Lγ <3.0. The short side bending angle between the plane formed by the electron gun side opening of the inner shield and the short side is Sγ, and the long side bending angle between the long side and the long side is Lγ, and the maximum deflection from the deflection center where the electron beam starts to be deflected by the deflection yoke. If the deflection angle of Dθ is Dθ, The inner shield is 2.5 <Dθ / Sγ <6.5 and 1.0 <Dθ / Lγ <3.0, the inner shield of the slim cathode ray tube, characterized in that.

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