KR20050017927A - Shadow Mask/Frame Assembly with Dampers attached to the Frame - Google Patents

Abstract

PURPOSE: A shadow mask/frame assembly is provided to effectively suppress vibrations of a frame by attaching a damper to the frame. CONSTITUTION: A shadow mask/frame assembly comprises a shadow mask(110), a frame(120), and a damper(130). The shadow mask includes an aperture portion with a plurality of holes and a non-aperture portion formed at an edge of the aperture portion, and selectively passes electron beams. The frame is coupled to the non-aperture portion of the shadow mask, and elastically supports the shadow mask. The damper has one side fixed at the frame and the other side with a free end. The damper suppresses vibrations of the frame by permitting the free end thereof to collide or rubbed against the frame when the frame vibrates.

Description

Shadow Mask / Frame Assembly with Dampers attached to the Frame}

The present invention relates to a cathode ray tube, and more particularly, to a damping system for controlling vibration of a mask and a frame.

In general, a shadow mask type cathode ray tube is a bulb composed of a panel on the front and a funnel on the back, a thin shadow mask formed on the inside of the panel and formed with a plurality of holes, and a shadow mask at the most. It is composed of a frame welded in place to support the shadow mask, a spring welded to the edge of the shadow mask and the frame assembly to absorb the vibration of the shadow mask assembly.

The cathode ray tube forms an image by the electron beam emitted from the electron gun installed at the rear of the funnel, passing through the hole of the shadow mask and colliding with the phosphor of the panel. At this time, about 70 to 80% of the electrons of the plurality of electron beams scanned from the electron gun do not pass through the opening and impact the shadow mask. On the other hand, the spring suppresses the direct vibration of the shadow mask due to the electromagnetic collision, and also serves to reduce the vibration of the shadow mask due to external noise or disturbance.

On the other hand, external force such as shock or vibration may be applied to the cathode ray tube, or the mask may vibrate by an adjacent speaker. The vibration of the magk by the external force may cause a change in the position of the mask having the color selection function, thereby lowering the color purity. In particular, along with the demand for a multimedia environment, unlike the past, such as installing a speaker around the cathode ray tube, external factors for vibrating the shadow mask, which is an image realizing apparatus inside the cathode ray tube, are increasing. Furthermore, television viewers have increasingly preferred high-powered speakers as they increasingly seek realism and liveliness. Vibration caused by the radiation of the high-power speaker is transmitted to the cathode ray tube bulb, and the vibration of the cathode ray tube bulb is transmitted to the shadow mask, thereby increasing the vibration of the shadow mask. As a result, the possibility of the howling phenomenon that the screen is distorted is increasing.

Several techniques have been proposed to reduce the vibration of such masks. For example, there is a method of directly attaching a ring-shaped damping mechanism to the no-hole of the mask to suppress the vibration of the mask, and other techniques similar to US Patent US6469431, US6520475 and the like are disclosed.

However, the mask and the frame constitute one assembly, and the mask and the frame tend to almost coincide with the vibration frequency of the mask. As a result, when the power of the speaker increases and the frequency of the vibration transmitted to the shadow mask coincides with the natural frequency of the mask / frame assembly, it causes a problem of worsening howling phenomenon due to resonance. As such, when the howling worsens, the shadow mask vibrates severely, and the electron beam emitted from the electron gun does not properly pass through the hole of the shadow mask. This collides with the phosphor in an inappropriate position, resulting in a mislanding phenomenon that degrades the screen quality. However, the technique of mask vibration reduction disclosed in the above cited documents does not effectively solve this problem.

The present invention is to solve this problem, to effectively suppress the vibration of the frame in the mask / frame assembly, to effectively absorb the vibration of the mask, and to effectively suppress the vibration of the frame when the mask and the frame is vibrated by external vibration factors This aims to prevent the vibration of the mask from being excited by the vibration of the frame.

In order to achieve the object of the present invention, one side is coupled to the frame and the other end is formed at the free end to attach a plate or cylindrical damper to the frame while suppressing the vibration of the frame while generating friction or butting with the frame when the frame vibrates. Provides a mask / frame assembly.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view of a mask / frame assembly in which a welding type damper according to the present invention is attached to a frame. As shown in FIG. 1, the mask / frame assembly includes a shadow mask 110, a frame 120, a welding type damper 130, and the like.

The shadow mask 110 is usually made of a thin plate having a thickness of about 1 mm or less and mainly made of invar steel. In the center portion of the shadow mask 110, a hole having a dot or stripe-shaped mask hole is formed, and a non-hole having no mask hole formed outside the hole, and has a color selection function. The shadow mask 110 of FIG. 1 is a tension shadow mask in which a stripe-type mask hole is formed, and the unmasked portions at both ends of the long side portion are welded to the support member 121 so that the shadow mask 110 is in the short side direction. Tensile force is applied, and the rigid member 122 supports the tensile force.

Frame 120 is composed of a support member 121 and the rigid member 122. The support member 121 is a simple beam having an approximately L-shaped cross section. The length of the support member 121 is equal to or slightly longer than the length of the long side of the shadow mask 110 and is approximately equal to the width of the short side of the mask. The material mainly uses alloys such as chromium-molybdenum steel. An approximately U-shaped rigid member 122 is welded to the rear surface of the support member 121. The rigid member 122 has a hollow rectangular tube or cylindrical tube shape, and is curved at a predetermined distance from a portion welded to the end of the support member 121. The rigid member 122 is usually made of a material that is elastic and does not have a higher coefficient of thermal expansion than the support member 121 or the shadow mask 110.

The welding type damper 130 is attached to the side of the frame 120 to attenuate the vibration of the frame 120, the width is less than or equal to the width of the frame, the length is less than or equal to the length of the frame, In addition, although the thickness is smaller than the frame, the thin film type is preferable.

One or more welding type dampers 130 are attached to one side of the frame 120. When the dampers 130 are attached to the frame 120, one end is welded to the frame 120 and the other end is welded. Is a free end, and welding is preferably spot welding. Looking at the area of welding, in spot welding, only a part of one end of the damper 130 is welded to the frame 120, and most of the damper 130 is supported by the weld joint to closely contact the side of the frame 120. do. When welding the damper 130 and the frame 120 by surface welding, one quarter or less, preferably one eighth or less, of the damper 130 is welded to the side surface of the frame 120.

The welding type damper 130 is attached to one side of the outer side or the inner side of the support member 121, or one side of the upper side or the lower side of the rigid member 122. The member 122 may be attached to the upper surface close to the shadow mask 110, and the support member 121 may be attached to the inner surface. In addition, the damper 130 may be attached only to the support member 121 or to the rigid member 122. However, in order to attenuate the vibration of the frame 120 more effectively, it is preferable to attach to both the support member 121 and the rigid member 122. On the other hand, the damper 130 is attached to one side of the support member 121 or the rigid member 122 is located in the center of the largest amplitude when the vibration occurs in the support member 121 or rigid member 122. desirable.

The welding type damper 130 attenuates the vibration of the frame by friction or collision with the frame 120 when the frame vibrates due to external force, thereby generating friction or collision force in a direction opposite to the vibration direction of the frame 120. .

2 is a plan view and a front sectional view showing a state in which the damper and the frame are welded in accordance with the present invention. As shown in FIG. 2, the damper 130 has one end portion A welded to the surface of the frame 120. The welding portion A is coupled by spot welding, and most of the damper 130 except for the spot welded portion is simply in close contact with the frame 120 as a free end. In particular, the opposite side of the welded portion (A) is the portion (B) where the damper 130 and the frame 120 most severely collide or rub when the frame 120 vibrates, the most important to damp the vibration of the frame 120 Part.

3A to 3C show various shapes of the welding type damper according to the present invention. FIG. 3A shows a flat damper without protrusions, and FIG. 3B shows a damper having protrusion beads in which bead-shaped protrusions are formed in the width direction at a portion where the damper and the frame collide with each other most severely. 3C shows a damper having a structure in which a portion in which the damper and the frame collide with each other most severely collide or friction is curved to the end. However, the dampers shown in Figs. 3A to 3C are just examples, and other types of dampers may be used.

4A to 4C show a structure in which a frame and a damper are coupled using a clip type damper according to the present invention.

4A is a plan view showing the shape of a frame. As shown in FIG. 4A, one hole L is formed in the frame 120. The hole L of the frame 120 is formed as a rectangular long hole in FIG. 4A, but may be formed in various shapes such as a circle and a triangle.

4B is a plan view showing the shape of the damper. As shown in FIG. 4B, one hole H is formed in the damper 130. The hole H of the damper 130 is formed in a circular shape in FIG. 4B, but may be formed in various shapes such as a rectangular long shape and a triangle.

Figure 4c is a front sectional view showing a coupling state of the clip-type damper coupled to the frame and the damper using a clip. In FIG. 4C, after the damper hole H and the frame hole L coincide with each other, the damper 130 is closely attached to the frame 120 and the damper 130 is coupled to the frame 120 using the clip 450. In the close contact portion of the damper 130 and the frame 120, the clip 450 is tightly coupled, and both ends are loosely adhered, so that the vibration damping effect of the frame 120 when the frame 120 vibrates is damper 130. It occurs mainly at both ends of). In FIG. 4C, the damper is coupled to the frame by a clip in the middle portion, but the coupling with the clip is not limited to the middle, but may be made at various parts such as one end of the damper.

5 is a perspective view showing a damper applied to another type of mask / frame assembly. As shown in FIG. 5, even if the structure of the frame is different, the damper 130 is attached to one side of the frame 520 to attenuate the vibration of the frame 520.

6 is a perspective view showing a damper applied to another type of mask / frame assembly. As shown in FIG. 6, even in a frame having a tripod-shaped support member, the damper 130 attached to the support member or the like effectively attenuates the vibration of the frame 620.

FIG. 7 shows an example of a damper that can be applied to a frame having a tripod-shaped support member of FIG. As shown in FIG. 7, the damper 730 is cylindrical, inserted into a tripod-shaped support member that forms one of the frames 620. The cylindrical damper 730 is inserted into the triangular support member, one end is coupled to the support member by welding or a clip, most of the rest is a free end. In FIG. 7, the cylindrical damper 730 is formed to be substantially equal to the length of the triangular support member, but the length of the damper 730 may be smaller than the length of the triangular support member.

8A and 8B show various shapes of a damper inserted into the triangular support member of FIG.

FIG. 8A illustrates the cylindrical damper described in FIG. 7, wherein the damper is preferably hollow in view of weight and damping effects.

Fig. 8B shows a damper of the same type that can be inserted into the triangular support member of Fig. 7. Here, the damper uses a hollow form in consideration of weight and damping effects.

When the dampers described above are used in the frame, the vibration of the shadow mask excited by the vibration of the frame can be effectively suppressed when the frame vibrates due to vibration factors such as the outside of the mask / frame assembly. You can effectively block the possibilities.

1 is a perspective view of a mask / frame assembly having a welding type damper attached to a frame according to the present invention;

2 is a plan view and a front sectional view showing a state in which the damper and the frame are welded in accordance with the present invention;

3a to 3c show various shapes of the welding type damper according to the present invention,

4A to 4C show a structure in which a frame and a damper are coupled using the clip type damper according to the present invention.

5 is a perspective view showing a damper applied to another type of mask / frame assembly;

5 is a perspective view showing a damper applied to another type of mask / frame assembly;

FIG. 7 shows an example of a damper that can be applied to a frame having a tripod-shaped support member of FIG. 6,

8A and 8B show various shapes of a damper inserted into the triangular support member of FIG.

-Explanation of symbols for the main parts of the drawing-

110: shadow mask 120: frame

121: support member 122: rigid member

130: damper A: weld

B: attenuation part 450: clip

730: cylindrical damper

Claims (9)

In the mask / frame assembly of a cathode ray tube, A shadow mask composed of a hole having a plurality of holes and a hole formed at the edge of the hole to selectively pass an electron beam; A frame coupled to the non-perforated part and elastically supporting the shadow mask; One side is fixed to the frame, the other side is composed of a free end frame damper, characterized in that it comprises a damper to suppress the vibration of the frame by colliding or friction with the frame when the frame vibrates Having a mask / frame assembly. The method of claim 1, wherein the damper A mask / frame assembly having a frame damper, wherein one end fixed to the frame is an end of the damper and the end is welded to the frame. The method of claim 2, wherein the damper Mask / frame assembly having a frame damper characterized in that it is spot welded. The method of claim 1, The damper has a hole penetrating at one side fixed to the frame, and the frame has a through hole at a position corresponding to the damper hole, and the damper is formed by a clip penetrating the damper hole and the frame hole. Mask / frame assembly having a frame damper, characterized in that coupled to the frame. The method of claim 4, wherein the damper through hole is Mask / frame assembly having a frame damper, characterized in that formed on the end of the damper. The method of claim 4, wherein the damper through hole is Mask / frame assembly having a frame damper, characterized in that formed in the middle of the damper. The damper according to any one of claims 2 to 6, wherein the damper is Mask / frame assembly having a frame damper, characterized in that the thin plate shape. The damper according to any one of claims 2 to 6, wherein the damper is Mask / frame assembly having a frame damper, characterized in that the cylindrical shape. The damper according to any one of claims 2 to 6, wherein the damper is Mask / frame assembly having a frame damper, characterized in that the tripod shape.