KR100186579B1 - Apparatus of reducing vibration of shadow mask of flat color crt - Google Patents

Abstract

The present invention relates to a shadow mask vibration damping device of a flat-color cathode ray tube, and even if vibration factors due to external shock or sound pressure of a speaker are transmitted to the shadow mask when the device is operated in a state of being mounted on the device, The shadow mask vibration damping device is provided so that the excitation vibration time is reduced so that the characteristics of the cathode ray tube are not significantly degraded so that the screen state is always good.

To this end, the present invention is to form a hole consisting of a plurality of holes in the long side and short side, except for the corner portion on the non-effective surface of the shadow mask fixed to the frame to reduce the area of the non-effective surface by the hole portion. .

Description

Shadow Mask Vibration Damping Device for Flat Color Cathode Ray Tube

1 is a longitudinal sectional view showing the structure of a flat color cathode ray tube.

2 is an enlarged view illustrating main parts showing a state of fixing a shadow mask of a flat color cathode ray tube;

3 is a front view showing a shadow mask of a flat color cathode ray tube.

4 is a longitudinal sectional view showing the main portion of a flat color cathode ray tube having a device according to Embodiment 1 of the present invention.

5 is a front view showing a shadow mask constituting the apparatus according to the first embodiment of the present invention.

6 is a longitudinal sectional view showing the main portion of a flat color cathode ray tube having a device according to Embodiment 2 of the present invention;

7 is a perspective view showing a state in which the leaf spring constituting the device according to the second embodiment of the present invention is fixed to the frame.

8 is a front view showing the main portion of a flat color cathode ray tube having a device according to Embodiment 3 of the present invention.

9 is a longitudinal sectional view showing the main portion of FIG.

Fig. 10 is a front view showing the main portion of a flat color cathode ray tube having a device according to Embodiment 4 of the present invention.

FIG. 11 is a longitudinal sectional view showing main parts of FIG. 10; FIG.

* Explanation of symbols for main parts of the drawings

7: frame 8: shadow mask

8b: invalid surface 11: hole

12: leaf spring 13: fixed rod

13a: protrusion 14: fixing piece

14a: protrusion

The present invention relates to a shadow mask vibration damping device of a flat color cathode ray tube, and more particularly, to provide a damping role when the shadow mask vibrates according to an external shock or a sound pressure of a speaker during operation, thereby reducing the vibration vibration time. Therefore, the screen state is good.

In general, a flat color cathode ray tube is a color cathode ray tube in which the panel surface is not a curved surface but a flat surface. The shape of the flat color cathode ray tube is a back of the panel 1 in a planar state as shown in FIG. Funnel (3) having a neck portion (2) is integrated to form an external shape of a bulb form, and inside the neck portion (2) toward the panel (1) 3 red, green, blue An electron gun 4 is embedded to emit a color electron beam, and a deflection yoke 5 is arranged on the outer circumferential surface of the neck portion 2 of the funnel 3 to deflect the electron beam emitted from the electron gun 4 in the horizontal and vertical directions. Is installed, and the explosion-proof glass 6 is attached to the outer surface of the panel 1 to prevent the risk of explosion-proof, and the frame 7 integrated in a rectangular shape is provided on the inner surface of the panel 1. Is fixed, and the frame has a portion of the electron beam emitted from the electron gun 4 The shadow mask 8 is fixed in a tensioned state so as to pass therethrough, and an image is formed when the electron beam passing through the shadow mask 8 hits the inner part of the frame 7 on the inner side of the panel 1. The fluorescent screen 9 is formed to be formed.

The shadow mask 8 is composed of an effective surface 8a having a plurality of beam passing holes 10 formed therein and an invalid surface 8b which is a part fixed to the frame 7 while forming an outer circumference of the effective surface. .

Therefore, when power is applied while the device is mounted on the device, high pressure is applied to the electron gun 4 in the neck portion 2 formed in the funnel 3 so that the electron gun operates to emit a three-color electron bag, and the emitted electron beam is a funnel ( 3) It is deflected in the horizontal and vertical directions by the magnetic field of the deflection yoke 5 installed on the front outer circumferential surface of the neck 2, and continues to be discharged toward the panel 1, where most of the deflected electron beam is fixed to the frame 7 Fluorescent screen (9) formed inside the inner frame (7) of the panel (1) through the beam through hole (10) that hits and is scattered and shadows the shadow mask (8) forming the effective surface (8a) of the shadow mask Since it collides with, a color screen is reproduced by a combination of three color electron beams.

The shadow mask 8 constituting the general flat color cathode ray tube has a tensile force of 21-30 N / Cm in a state fixed to the frame 7, which is an electron beam from which the shadow mask 8 is emitted from the electron gun 4. This is to reduce the swelling doming phenomenon caused by the temperature rise, thereby suppressing the vibration in the direction parallel to the screen.

In the general flat color cathode ray tube, a device for damping the shadow mask is not provided. Therefore, when the device is operated in the state where the flat color cathode ray tube is mounted, external impact or sound pressure of the speaker may occur. As the vibration of the shadow mask is not easily reduced, the aftershock vibration time is long, so that the characteristics of the cathode ray tube are greatly reduced.

The present invention has been made to solve the above problems, and when the device is operated in the state of mounting the device, even if vibration factors due to external shock or sound pressure of the speaker are transmitted to the shadow mask, the vibration vibration time due to the damping role is increased. It is an object of the present invention to provide a shadow mask vibration damping device so as to reduce the screen condition so that the characteristics of the cathode ray tube are not significantly degraded.

According to an aspect of the present invention for achieving the above object, an area of the effective surface is formed by forming a hole consisting of a plurality of holes in the long side and short side, respectively, except for the corner portion on the non-effective surface of the shadow mask fixed to the frame. There is provided a shadow mask vibration damping device of the present invention flat collar cathode ray tube that is reduced by as much as a hole.

Hereinafter, the present invention will be described in more detail with reference to FIGS. 4 to 11.

4 is a longitudinal sectional view showing a main portion of a flat color cathode ray tube having a device according to Embodiment 1 of the present invention, and FIG. 5 is a front view showing a shadow mask constituting the device according to Embodiment 1 of the present invention. In the first embodiment, the central part is widest and shorter toward the corner part on the ineffective surface 8b of the shadow mask 8 fixed in the tensioned state in the frame 7, except for the corner part. The holes 11 formed of a plurality of holes are formed so as to have a shape so that the area of the ineffective surface 8b is reduced by the area of the holes 11.

FIG. 6 is a longitudinal sectional view showing a main portion of a flat color cathode ray tube having a device according to a second embodiment of the present invention, and FIG. 7 is a view showing a state where the leaf spring constituting the device according to the second embodiment of the present invention is fixed to a frame. As a perspective view, Embodiment 2 of the present invention fixes the leaf spring 12 to the inner side of the long and short sides of the frame 7 so that the upper portion of the leaf spring contacts the ineffective surface 8b of the shadow mask 8. It is a structure made.

FIG. 8 is a front view showing the main part of a flat-colored cathode ray tube having a device according to the third embodiment of the present invention, and FIG. 9 is a longitudinal sectional view showing the main part of FIG. 8, and in the third embodiment of the present invention, the shadow mask 8 is fixed. Fixing rods 13 are fixed to the outer side of the long side and the short side of the frame 7, one for each side, and a plurality of protrusions are in contact with the non-effective surface 8b of the shadow mask 8. It is a structure in which (13a) was formed.

FIG. 10 is a front view showing a main portion with a planar colored cathode ray having a device according to the fourth embodiment of the present invention, and FIG. 11 is a longitudinal sectional view showing the main part of FIG. 10, wherein the shadow mask 8 is fixed in the fourth embodiment of the present invention. A plurality of fixing pieces 14 are fixed to each of the sides of the long side and the short side of the frame 7, and the projections 14a are brought into contact with the non-effective surface 8b of the shadow mask 8 on each of the supporting pieces. It is a structure formed.

The operation of the flat color cathode ray tube having the device of the present invention configured as described above is the same as the operation of the general flat color cathode ray tube described above, and thus will be omitted. Accordingly, only the process of damping the vibration when the shadow mask vibrates will be described in detail later.

The shadow mask 8 is fixed to the frame 7 and the frame is fixed to the panel 1 when a vibration factor caused by external shock or sound pressure of the speaker occurs while the color cathode ray tube is in operation. Vibration factors are transmitted to the shadow mask 8, wherein the shadow masks are each long and short sides except for corner portions of the ineffective surface 8b in which the beam passing holes 10 are not formed as in the first embodiment. Since the hole portion 11 is formed of a plurality of holes, the area of the non-effective surface 8b of the shadow mask 8 is reduced by this hole portion, and thus the vibration force transmitted to the shadow mask 8 is also reduced. As a result, the vibration of the shadow mask is totally attenuated.

In the above, the shape of the hole 11 formed in the ineffective surface 8b of the shadow mask 8 is widest in the center portion and narrower toward the corner portion. This is because the vibration of the shadow mask (8) due to the vibration factor is the strongest in the center portion and weaker toward the corner portion.

Meanwhile, Embodiments 2, 3, and 4 of the present invention form a node on the ineffective surface 8b of the shadow mask 8, so that the shadow mask 8 vibrates even under the vibration force. As the excitation vibration time is suppressed, the overall vibration of the shadow mask 8 is attenuated.

That is, in Example 2, the leaf spring 12 is fixed to the inner side of the long side and the short side of the frame 7, so that a part of the leaf spring is in contact with the ineffective surface 8b of the shadow mask 8. In this state, when the shadow mask 8 vibrates under the vibration force, the leaf spring 12 absorbs the vibration and suppresses the excitation vibration time by the node point of the leaf spring. The fixing rods 13 are fixed to the outer side of the long side and the short side of the frame 7 to which the side 8 is fixed, one fixing rod 13 for each side, and the non-effective surface 8b of the shadow mask 8 is attached to each fixing rod. In the fourth embodiment, a plurality of fixing pieces 14 are fixed to each side of the long side and the short side of the frame 7 on which the shadow mask 8 is fixed. Contacting the non-effective surface 8 of the shadow mask 8 The crab protrusion 14a is formed so that the contact point of each of the protrusions and the shadow mask 8 is the effective point 8a, and the suppression of the vibration vibration time of the shadow mask 8 according to the node point is performed in Example 2 It is the same as the suppression of the excitation vibration time of the node point by the leaf spring 12 described in the following.

Therefore, in the present invention, the vibration force is transmitted to the shadow mask according to the external shock or the sound pressure of the speaker during operation, so that even if the shadow mask vibrates, a portion of the vibration force is absorbed or the characteristics of the cathode ray tube are reduced as the aftershock vibration time is reduced. As a result, the screen state is always good.

Claims (6)

Flat color cathode ray tube, characterized in that the effective surface of the shadow mask fixed to the frame is formed of a plurality of holes in each of the long side and short side except for the corner portion to reduce the area of the invalid surface by the hole portion. Shadow Mask Vibration Damper. 2. The hole according to claim 1, wherein the hole is widest in the center portion and narrower toward the corner portion. Shadow mask vibration damping device of a flat color cathode ray tube, characterized in that the form. Shadow mask vibration of a flat-colored cathode ray tube, characterized in that the shadow member is fixed to the frame where the shadow mask is fixed so that the contact member contacts the ineffective surface of the shadow mask so that the shadow mask contact portion of the contact member is a node. Damping device. 4. The shadow mask vibration damping device of claim 3, wherein the contact member comprises a leaf spring fixed to an inner surface of a long side and a short side of the frame, the upper end of which is in contact with a shadow mask. The method of claim 3, wherein the contact member is fixed to each of the sides of the long side and short side of the frame is fixed with a fixed rod having a plurality of projections in contact with the non-effective surface of the shadow mask of the flat color cathode ray tube Shadow mask vibration dampening device. The shadow of a flat-colored cathode ray tube according to claim 3, wherein the contact member is composed of a fixing piece having a plurality of protrusions fixed to each of the sides of the frame on the long side and the short side of the outer side, and having protrusions to contact the ineffective surface of the shadow mask. Mask vibration damper.