KR100228172B1 - Flat screen for cathode ray tube - Google Patents

Abstract

The present invention relates to a built-in flat screen in which a flat glass is placed between a shadow mask and a panel in the interior of a color image and the phosphor is applied.

A flat glass 21 is provided between the panel 11 and the shadow mask 13 with a certain distance q from the outer surface of the panel 11 via a support clip 22, 21 is formed on the inner surface thereof with a fluorescent screen 15. Accordingly, the built-in flat screen of the present invention has an effect of preventing the stress due to the flattening of the panel and the action of the high vacuum pneumatic pressure from being increased and keeping the q value easy.

Description

Built-in flat screen

FIG. 1 is a perspective view showing a part of a color cathode-ray tube in an incision; FIG.

FIG. 2 is a side view showing a cathode ray tube to which a built-in flat screen of the present invention is applied; FIG.

FIG. 3 is a perspective view showing a mounting state of a built-in flat screen of FIG. 2; FIG.

DESCRIPTION OF THE REFERENCE NUMERALS

11: Panel 12: Funnel

13: shadow mask 14: electron gun

15: fluorescent screen 20: frame

21: flat screen 22: support clip

S: aperture q: clearance

The present invention relates to color image correlation, and more particularly, to a built-in flat screen in which a flat glass is provided between a shadow mask and a panel in a color image correlation and a phosphor is applied.

1, generally, a cathode ray tube is a vacuum bulb structure in which a glass panel 11 and a funnel 12 are joined together. A shadow mask 13 and an electron gun 14 are mounted and a deflection yoke (not shown) is attached to the front of the electron gun 14 from the outside to complete the cathode ray tube assembly.

The electron gun 14 is composed of a cathode (not shown) and a plurality of lenses (not shown) G The B electron beam is focused and accelerated by various lens systems, is greatly accelerated by a high voltage applied through the anode (anode), then deflected by the deflection yoke and reaches the shadow mask 13. An electron beam passing sequentially through each aperture S in the shadow mask 13 in which numerous fine holes (hereinafter referred to as apertures) are formed is scanned on the fluorescent surface 15 formed on the inner surface of the panel 11 to form R G B are emitted to emit red, green, blue, or the like in each pixel corresponding to the aperture S,

In this case, the distance from the fluorescent surface 15 of the panel 11 to the outer surface of the shadow mask 13 is q-value. If the q-value, which is one of the factors that determine the characteristics of the cathode ray tube, A group and a degroup are generated. the inner surface of the panel 11 and the outer surface of the shadow mask 13 must have an accurate curvature in order to maintain the q value.

If the inner surface of the panel 11 and the outer surface of the shadow mask 13 are flattened instead of curved surfaces, it is easy to maintain an accurate q value. However, since the stress due to the action of the inner high vacuum pressure increases when the panel 11 is flattened, So that the strength must be compensated.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a built-in type light source device in which a separate flat glass is provided between a panel and a shadow mask and a fluorescent surface is formed to prevent the stress due to the flattening of the panel, To provide a flat screen.

In order to achieve the above object, a flat glass (21) is interposed between the panel (11) and the shadow mask (13) with a certain distance (q) from the outer surface of the panel (11) , And a fluorescent screen (15) is formed on the inner surface of the flat glass (21).

At this time, the support clip 22 is bonded in appropriate quantities to absorb the difference in thermal expansion between the flat glass 21 and the shadow mask 13 at the upper, lower, left and right sides of the frame 20 on which the shadow mask 13 is mounted .

As another example, the flat glass 21 may be bonded to the inner surface of the panel 11 with an adhesive instead of being attached to the frame 20. [

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to preferred embodiments thereof with reference to the accompanying drawings.

FIG. 2 is a side view showing a cathode ray tube to which the built-in flat screen of the present invention is applied.

The flat glass 21 is provided between the panel 11 and the shadow mask 13. The flat glass 21 is spaced from the outer surface of the panel 11 by a predetermined distance, Respectively. A fluorescent screen 15 is formed on the inner surface of the flat glass 21, and a fluorescent screen is not formed on the inner surface of the panel 11.

Therefore, in the above embodiment, the panel 11 does not play a role of forming a pixel but merely serves as a structure to receive stress due to high vacuum in the cathode ray tube. On the other hand, the shadow mask 13 and the flat glass 21 are flattened to facilitate maintaining the q value.

3 is a perspective view showing the mounting state of the built-in flat screen of FIG. 2; FIG.

A support clip 22 having a predetermined elastic force is used as a means for supporting the flat glass 21. [ The support clips 22 are bonded in appropriate quantities to absorb the difference in thermal expansion between the flat glass 21 and the shadow mask 13 at the upper, lower, left and right sides of the frame 20 on which the shadow mask 13 is mounted. In the figure, the largest number of support clips 20 are arranged under the frame 20 in consideration of the weight of the flat glass 21.

The coefficient of thermal expansion of the flat glass 21 formed as a relatively thin plate can be seen to be about 1/2 times that of the metal frame 20, the shadow mask 13 and the support clip 22. Therefore, when the cathode ray tube is in operation The support clip 22 is not subjected to thermal stress of the flat glass 21 due to heat generation. However, the support clip 22 absorbs the difference in thermal expansion between the flat glass 21 and the shadow mask 13 during the cooling / heating of the cathode ray tube and is suitable for preventing the flat glass 21 from being damaged by external vibration and impact It has elasticity.

This embodiment makes it easy to attach and detach the frame 20 to the stud pins (not shown) of the panel 11, thereby facilitating the screening process of applying the three-color fluorescent film by black coating and screen coating. When the workability is improved, the work flow is reduced and the quality of the cathode ray tube is improved.

As another embodiment, the flat glass 21 may be bonded to the inner surface of the panel 11 with an adhesive, instead of being provided on the frame 20, though not shown.

As described above, the built-in flat screen according to the present invention has a separate flat glass between the panel and the shadow mask and forms a fluorescent surface, thereby preventing a stress due to planarization of the panel and internal high vacuum pressure the q value can be easily maintained.

Although the present invention has been shown and described with respect to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as set forth in the following claims Those skilled in the art will readily know what is known in the art.

Claims (3)

A cathode ray tube assembly for scanning a focused electron beam onto a fluorescent surface (15) of a panel (11) through a shadow mask (13), the cathode tube assembly comprising: a support clip (22) interposed between the panel (11) Wherein a flat glass (21) is provided at an interval (q) from the outer surface of the panel (11), and a fluorescent screen (15) is formed on the inner surface of the flat glass (21). The shadow clip according to claim 1, wherein the support clip (22) is made of a material that is suitable for absorbing the difference in thermal expansion between the flat glass (21) and the shadow mask (13) Wherein the flat surface is bonded to the inner surface of the flat screen. The built-in flat screen according to claim 1 or 2, wherein the flat glass (21) is bonded to the inner surface of the panel (11) with an adhesive instead of being attached to the frame (20).