Magnetic shield with cathode ray tube standoff for a computer monitor
AssigneeEnvironmental Services & Products, Inc.
InventorsSanford H. Greenberg, Richard France, Frank Turner
Life of this patent
Estimating the term…
Abstract
A shield for a computer monitor comprises a hollow cylindrical magnetic sleeve disposed around at least a portion of the yoke windings of the monitor. The sleeve has a diameter greater than the diameter of the yoke windings. A cathode ray tube (CRT) standoff for the shield provides for ease of shield installation and continued operation of the monitor within specification without impairing image integrity (i.e. distortion, color impurity or brightness). The standoff creates a specific distance (critical threshold) between the glass bell of the CRT and the shield that prevents image distortion that cannot be overcome through adjusments of the monitor controls (critical interference).
Claims14
A shield for a computer monitor of the type including an evacuated tube having a screen portion, a bell portion and a neck portion;
- means for generating a beam of charged particles toward the screen portion;
- and means disposed at the neck portion for deflecting a beam of charged particles;
- the deflecting means having a diameter;
- said shield comprising:
- a) a hollow cylindrical magnetic sleeve configured for being disposed around at least a portion of the deflecting means;
- b) a leg attached to said sleeve for establishing a standoff distance between said magnetic sleeve and a bell portion of an evacuated tube, said standoff distance establishing a critical threshold between the bell portion and said magnetic sleeve for curing critical interference;
- c) said leg extending outwardly of said shield and including a foot configured for contacting the bell portion of the evacuated tube;
- d) said foot being disposed at a predetermined distance from said sleeve and establishes said critical threshold;
- and
- e) said sleeve has a diameter greater than the diameter of the deflecting means.
A shield for a computer monitor of the type including an evacuated tube having a screen portion, a bell portion and a neck portion;
- means for generating a beam of charged particles toward the screen portion;
- and means disposed at the neck portion for deflecting a beam of charged particles;
- the deflecting means having a diameter;
- said shield comprising:
- a) a hollow cylindrical magnetic sleeve configured for being disposed around at least a portion of the deflecting means;
- b) said sleeve including front and rear spaced opposed portions;
- c) a front tab extending a first predetermined distance from said front portion for establishing a standoff distance between said magnetic sleeve and a bell portion of an evacuated tube, said standoff distance establishing a critical threshold between the bell portion and said magnetic sleeve for curing critical interference;
- and
- d) said sleeve has a diameter greater than the diameter of the deflecting means.
A computer monitor, comprising:
- a) an evacuated tube having a screen portion, a bell portion and a neck portion;
- b) means for generating a beam of charged particles toward said screen portion;
- c) means disposed at said neck portion for deflecting said beam of charged particles, said deflecting means having a diameter;
- d) a hollow cylindrical magnetic sleeve disposed around at least a portion of said deflecting means;
- e) a leg attached to said sleeve for establishing a standoff distance between said magnetic sleeve and a bell portion of an evacuated tube, said standoff distance establishing a critical threshold between the bell portion and said magnetic sleeve for curing critical interference;
- f) said leg extending outwardly of said sleeve and including a foot configured for contacting the bell portion of the evacuated tube;
- g) said foot being disposed at a predetermined distance from said sleeve and establishes said critical threshold;
- and
- h) said sleeve having a diameter greater than the diameter of said deflecting means.
Dependencies are inferred from the claim text.