The present invention relates generally to degaussing coils for cathode ray tubes.
Cathode ray tubes (CRTs) in general rely upon either electromagnetic or electrostatic deflection to scan an electron beam across a phosphor screen. Upon impact by electrons, the phosphors within the screen emit visible light in one or more colors. Large screen CRTs used in direct view television sets rely upon electromagnetic deflection generated by a yoke that is affixed to the neck of the CRT near the junction of the neck and the funnel of the CRT envelope.
Because certain components within the CRT, such as an inner magnetic shield, an aperture grill and a frame for the aperture grille, may become magnetized because of (1) magnetic fields generated by the yoke, or (2) other components within a television set such as permanent magnet loudspeakers, or (3) external accessories mounted on top of or near the television, such as video cassette recorders and video games, it is extremely desirable to periodically degauss the CRT in order to minimize distortion of an image created by scanning an electron beam across the phosphor screen of the CRT. In addition, heat shrink bands may also become magnetized.
Accordingly, degaussing coils have been provided within the CRT chassis to operate in accordance with principles known in the art to remove unwanted magnetization from the CRTs. As recognized herein, however, while effective for their intended purpose, degaussing coils can generate mechanical noise that can be transmitted to the chassis holding the CRT and/or to the CRT itself, which is distracting to users. Having made this critical observation, the solutions herein have been provided.
A system includes a cathode ray tube (CRT) and at least one degaussing coil juxtaposed with the CRT. A resilient cylindrical degaussing coil holder closely surrounds the degaussing coil to dampen noise transmission from the coil to structure adjacent the coil.
The non-limiting holder may be formed with plural longitudinal ribs or with plural radial rings. The holder may be disposed on a heat shrink (HS) band that is positioned on the CRT, or on a support structure that is part of a chassis assembly. The holder can consist of a unitary piece of material. The CRT can establish part of a television.
In another aspect, a television includes a chassis assembly and at least one degaussing coil inside the chassis assembly. The TV also includes a noise dampening coil holder circumscribing the coil.
In yet another aspect, a display system includes magnetic degaussing means and chassis means holding the degaussing means. Mechanical noise dampening means closely surround the degaussing means for dampening the transmission to the chassis means of mechanical noise generated by the degaussing means.
The details of the present invention, both as to its structure and operation, can best be understood in reference to the accompanying drawings, in which like reference numerals refer to like parts, and in which:
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While the particular NOISE DAMPENING DEGAUSSING COIL HOLDER as herein shown and described in detail is fully capable of attaining the above-described objects of the invention, it is to be understood that it is the presently preferred embodiment of the present invention and is thus representative of the subject matter which is broadly contemplated by the present invention, that the scope of the present invention fully encompasses other embodiments which may become obvious to those skilled in the art, and that the scope of the present invention is accordingly to be limited by nothing other than the appended claims. For instance, the coil holder need not be made of a unitary piece of material unless otherwise claimed as such. In the claims, reference to an element in the singular is not intended to mean “one and only one” unless explicitly so stated, but rather “one or more”. It is not necessary for a device or method to address each and every problem sought to be solved by the present invention, for it to be encompassed by the present claims. Furthermore, no element, component, or method step in the present disclosure is intended to be dedicated to the public regardless of whether the element, component, or method step is explicitly recited in the claims. Absent express definitions herein, claim terms are to be given all ordinary and accustomed meanings that are not irreconcilable with the present specification and file history.
This application claims priority from U.S. provisional application Ser. No. 60/488,519, filed Jul. 17, 2003.
Number | Date | Country | |
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60488519 | Jul 2003 | US |