Patent Application
20060186784
This application makes reference to, incorporates the same herein, and claims all benefits accruing under 35 U.S.C. ยง 119 from an application for CATHODE RAY TUBE (CRT), earlier filed in the Korean Intellectual Property Office on 18 Feb. 2005 and there duly assigned Serial No. 10-2005-0013471.
1. Field of the Invention
The present invention relates to a Cathode Ray Tube (CRT), and more particularly, to a CRT which is prevented from breaking and flying into pieces.
2. Description of the Related Art
Generally, a Cathode Ray Tube (CRT) is includes a glass tube with a panel, a funnel, and a neck. The tube is evacuated to be in a vacuum state such that electrons are emitted therein to excite phosphors and display the desired images.
When the CRT endures mechanical or thermal impacts in an air atmosphere, cracks are generated in the glass tube, shattering it such that the glass is broken into pieces, and scattered.
The glass shattering is from the side of the panel or the side of the funnel depending upon the shape of the tube or the stress applied thereto.
In order to solve such a problem, considering that the stress is concentrated on a skirt of the panel of the CRT, an explosion proof band with a predetermined tension is provided on the skirt of the panel. With this structure, when cracks are generated in the skirt, they are not developed so that the glass shattering can be prevented.
With the recent trends related to CRTs, in order for CRTs to be competitive as compared to a Plasma Display Panel (PDP), a liquid crystal display or an organic field emission display, the tube size must be reduced to make the CRT slimmer. The length of the funnel is then shorter as compared to that of the common CRT.
Accordingly, upon receipt of an external force, the slimmed CRT generates cracks at the funnel portion thereof due to the distorted funnel shape so that glass pieces are liable to be scattered from the side of the funnel to the side of the panel.
In this consideration, the explosion proof band mounted at the panel side is shortto prevent the scattering of glass pieces from the slimmed CRT.
Alternatively, efforts have been made to prevent the glass tube from being shattered by attaching a film to the side of the panel. However, such a film is not enough to prevent the glass shattering, and involve a high production cost.
It is an object of the present invention to provide a Cathode Ray Tube (CRT) which prevents the glass from shattering due to the cracks generated from the side of a funnel upon receipt of an external impact.
According to one aspect of the present invention, the CRT includes: a panel including an inner phosphor screen; a funnel connected to the panel and adapted to have a deflection unit arranged thereon; a neck connected to the funnel and having an electron gun arranged therein; and a shatter-proof member attached the funnel to prevent the tube from shattering.
The shatter-proof member preferably includes a material different from that of the tube. The shatter-proof member preferably includes a fire retardant material. The shatter-proof member preferably includes glass fibers. The shatter-proof member is preferably attached to an outer surface of the funnel by an adhesive. The adhesive preferably includes one or more materials selected from the group consisting of epoxy resin, silicon resin, urethane resin, and rubber-based polymer. The adhesive preferably includes a film, and the shatter-proof member is preferably attached to the funnel while being covered by the adhesive.
The shatter-proof member is preferably arranged on a portion of the funnel. More than one shatter-proof members are preferably cross-arranged on the funnel. More than one shatter-proof members are preferably arranged on the funnel around the neck and are symmetrical to each other. The shatter-proof member is preferably arranged at the interface of the panel and the funnel where the panel and the funnel are sealed to each other.
According to another aspect of the present invention, the CRT includes: a panel including an inner phosphor screen; a funnel connected to the panel and adapted to have a deflection unit arranged thereon; a neck connected to the funnel and having an electron gun arranged therein; and a reinforcing member attached to the tube by an adhesive, the reinforcing member of a material different from that of the tube.
The reinforcing member is preferably arranged on the funnel. The reinforcing member is preferably arranged at the interface of the panel and the funnel where the panel and the funnel are sealed to each other. The reinforcing member is preferably arranged on the funnel and at the interface of the panel and the funnel where the panel and the funnel are sealed to each other. The reinforcing member preferably includes a fire retardant material. The reinforcing member preferably includes glass fibers.
The adhesive preferably includes one or more materials selected from the group consisting of epoxy resin, silicon resin, urethane resin and rubber-based polymer. The adhesive preferably includes a film, and the reinforcing member is preferably attached to the tube while being covered by the adhesive.
The reinforcing member is preferably arranged on a portion of the funnel. The reinforcing members are preferably cross-arranged on the funnel. The reinforcing members are preferably arranged on the funnel around the neck and are symmetrical to each other. The reinforcing member is preferably arranged along the interface of the panel and the funnel where the panel and the funnel are sealed to each other.
A more complete appreciation of the present invention and many of the attendant advantages thereof, will be readily apparent as the present invention becomes better understood by reference to the following detailed description when considered in conjunction with the accompanying drawings in which like reference symbols indicate the same or similar components, wherein:
The present invention is described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the present invention are shown.
As shown in
The case 32 is formed with front and back cases 32a and 32b arranged at the front and rear of the CRT 30 and attached to each other with screws. The support 34 is formed into a stand.
The CRT 30 is wholly located within the case 32 such that the neck thereof is inside of the support 34.
As shown in the drawings, the CRT 30 includes a tube 30g, which has a rectangular panel 30a with a inner phosphor screen 30f, a funnel 30b connected to the panel 30a and having a deflection unit 30c arranged on the outer circumference of a cone 300b thereof, and a neck 30e connected to the rear of the cone 300b and having an electron gun 30d mounted thereon.
With the CRT 30, the tube 30g is internally kept in a vacuum state, and electron beams emitted by the electron gun 30d are deflected by the deflection unit 30c in the directions of the long axis of the panel 30 (the horizontal axis, the direction of the x axis of
With the CRT 30, cracks are liable to be generated at the tube 30g when it endures mechanical or thermal impacts from the outside, causing the tube 30g to break into pieces, and scattered. As described below, the CRT is provided with an arrangement for solving such a problem.
As shown in
The shatter-proof members 40 prevent the shattering of the tube 30g due to cracks generated thereon and hold the original shape thereof, and hence, can be referred to as reinforcing members for the tube 30g, and which is for explanatory convenience are referred to below collectively as the shatter-proof member.
With a common CRT, considering that the tube 30g with the panel 30a, the funnel 30b and the neck 30e is formed of glass, the shatter-proof member is formed of a material different from that of the glass tube 30g.
In this embodiment, a fire retardant material is used for the shatter-proof member 40, such as glass fibers. However, the material for the shatter-proof member 40 is not limited thereto.
The shatter-proof member 40 is attached to the outer surface of the funnel 30a by an adhesive 42. The adhesive 42 is formed of one or more high temperature resistant materials selected from epoxy resin, silicon resin, urethane resin, and rubber-based polymers such as butadiene rubber, acrylonitrile butadiene rubber and chloroprene rubber.
In this embodiment, the adhesive 42 is formed of an epoxy resin film. The shatter-proof members 40 are formed on the outer surface of the funnel 30b, and each covered by the adhesive film 42 such that it is attached to the funnel 30b due to the adhesion of the adhesive 42.
As described above, the shatter-proof members 40 can be placed at suitable locations on the funnel 30b in consideration of the practical shape of the tube 30g or the stress distribution thereon.
The locations of attachment of the shatter-proof members are not limited to the funnel. Considering that with the common CRT, cracks are mainly generated in the contact area of the panel and the funnel where the sealing thereof occurs, the shatter-proof members according to an embodiment of the present invention can be attached to the seal area.
In order to heighten the effect of the shatter-proof member, it can be attached to the funnel 30b as well as to the contact area of the panel 30a and the funnel 40b (as shown in
With the above-structured CRT, even though the tube is speedily heated under the application of thermal impact occurring during a fire while generating thermal stress and cracks so that the tube is broken, the shatter-proof members provided at the funnel or/and the contact area of the panel and the funnel constantly hold the tube pieces, which are prevented from being scattered.
Moreover, in this embodiment, as the shatter-proof member is formed with a fire retardant material, it securely holds the broken tube even under the emergent conditions such as a fire to prevent the broken tube pieces from being scattered.
The effect of the shatter-proof member can be further exerted with a slimmed CRT where the funnel length is shorter than that of the common CRT.
As described above, with the CRT in accordance with the present invention, even though it is formed as a slimmed tube depending upon the interest of the consumers, the shattering of the tube in the presence of cracks can be effectively prevented due to the operation of the shatter-proof members formed on the tube, and the consumers do not suffer safety problems due to the tube shattering. This effect can be facilitated together with the operation of a common explosion proof band.
Although exemplary embodiments of the present invention have been described in detail hereinabove, it should be clearly understood that many variations and/or modifications of the basic inventive concept herein taught which can appear to those skilled in the art will still fall within the spirit and scope of the present invention, as defined in the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2005-0013471 | Feb 2005 | KR | national |
