Laminated spring structure for CRT

Details Laminated spring structure for CRT Laminated spring structure for CRT

1998-10-27

2001-02-13

Patel, Vip (Department: 2879)

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

C313S402000, C313S404000

Reexamination Certificate

active

06188168

ABSTRACT:

REFERENCE TO RELATED APPLICATION
This application is based on application No. 97-65014 filed in Korean Industrial Property Office on Dec. 1, 1997, the content of which is incorporated hereinto by reference.
FIELD OF THE INVENTION
The present invention relates to a spring for a cathode ray tube (CRT) and, more particularly, to a spring for mounting a shadow mask within a CRT panel while extinguishing the vibration energy transmitted thereto.
BACKGROUND OF THE INVENTION
In general, CRTs are designed to display colored images on a panel screen by exciting phosphors on the internal surface of the screen with electron beams emitted from an electron gun while varying the intensity of phosphor-excitation. A thin-metal shadow mask having a plurality of apertures is placed directly behind the screen to ensure that each beam hits the corresponding phosphor. That is, the shadow mask may act as a color selector to minimize the generation of spurious colors due to excitation of the wrong phosphor.
The shadow mask is mounted in the CRT panel with a support assembly. The support assembly includes a mask frame placed under the shadow mask to support it and a plurality of stud pins each embedded in the panel with a protruding portion. The support assembly further includes a plurality of springs for connecting the mask frame to the stud pins. Each of the springs has an end welded to the mask frame and an opposite end engaged with the protruding portion of the stud pin.
The spring is conventionally formed with a metal plate consisting of one element. However, with this structure, when external impacts or sonic waves from a Speaker are applied to the CRT, the resulting vibration energy is easily transmitted to the shadow mask sequentially through the stud pin and the spring. At this time, the shadow mask seriously vibrates due to its structural weakness so that the electron beam deviates from its correct progressing course and impinges upon wrong phosphors, causing spurious color images on the viewing screen.
Therefore, it is necessary that the spring should act as a connecting medium capable of minimizing or interrupting the vibration energy from the external.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a spring for mounting a shadow mask assembly within a CRT panel with an improved vibration prevention characteristic.
In order to achieve this object, the spring is formed with a composite metal plate having a laminated structure of more than two materials capable of converting the vibration energy applied thereto into a thermal energy by an internal or interfacial friction.
A method of making the spring includes the steps of plating two or more metallic materials in sequence, rolling the plated metallic materials into an integrated composite metal plate, and forming the composite metal plate into a spring shape.
The composite metal plate is composed of a first steel, a zinc alloy, and a second steel to convert the vibration energy applied thereto into the thermal energy by the internal friction of the zinc alloy and interfacial friction between the steel and the zinc alloy, resulting in an efficient vibration offsetting effect.


REFERENCES:
patent: 4506188 (1985-03-01), Puhak
patent: 4613785 (1986-09-01), Ragland

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