Video circuit enclosure for attachment to a cathode ray tube

• US 4,873,578 A
• Filed: 07/28/1987
• Issued: 10/10/1989
• Est. Priority Date: 07/28/1987
• Status: Expired due to Term

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Digital Equipment Corporation (HP Inc.)
• Inventors: Tognoni, Keith I., Yonkers, Paul, Welch, Glenn, Fitzgerald, John
• Primary Examiner(s): Groody, James J.
• Assistant Examiner(s): Vu, Kim-Yen
• Application Number:
  US07/078,778
• Time in Patent Office: 805 Days
• Field of Search: 358/254, 358/248, 361/397, 361/399, 361/412, 361/413, 361/415, 174/194, 312/7.2, 313/318, 439/58, 439/80, 439/81, 439/683
• US Class Current: 348/836
• CPC Class Codes: H04N 5/655 Construction or mounting of chassis, e.g. for varying the elevation of the tube

Abstract

A video circuit enclosure for housing a video circuit, such as a video amplifier circuit that is used to drive a cathode ray tube is disclosed. The video circuit enclosure includes a video box with an open face through which the cathode ray tube is inserted. A video board, on which the video circuit is mounted is secured inside the video box. A heat sink is attached to one end of the video box and is a thermal path with heat-generating components on the video board. A socket board, located inside the video box, is mounted to the cathode ray tube. The socket board is located in the video box so it is slightly spaced away from the video board. A video cover is attached to the socket board and spaced away therefrom so it covers the open face of the video box. A set of spring loaded pin contacts attached to the socket board abut contact pads on the video board so as to provide a low impedance electrical slip connection between the boards. A video cover, attached to the socket board, is disposed over the open face of the video box.

Claims

1. A video circuit enclosure for attachment to a cathode ray tube, the cathode ray tube having a screen face and a neck extending away from the face, said neck having at least one conductive terminal for the cathode ray tube, the video circuit enclosure comprising:

(a) video box formed of conductive material so as to form a shield, said box disposed over the portion of the cathode ray tube have the conductive terminals, said box forming an open face into which the cathode ray tube neck is inserted;

(b) a video board secured inside said video box, said video board including at least a video circuit for supplying signals to the cathode ray tube;

(c) a socket board disposed inside said video box closely spaced from said video board, said socket board having a socket means for coupling to the cathode ray tube so that it is attached thereto and in electrical contact with the cathode ray tube terminal;

(e) an electrical connection means connected to said socket means able to maintain a conductive path for signal transfer therebetween when said video board and said socket board move relative to each other; and

(d) a video cover formed of conductive material disposed over said video box open face and forming an hole the cathode ray tube is positioned in, said video cover attached to said socket board and spaced away therefrom so that when said socket board is disposed in said video box, said video cover is in electrical contact with said video box.

2. The video circuit enclosure of claim 1 wherein the video circuit includes one or more heat generating components, and a heat sink attached to said video box, said heat sink being in thermal contact with said video circuit heat generating components.

3. The video circuit enclosure of claim 1 wherein at least one of said electrical connection means comprises:

(a) a contact pin assembly secured to said socket board with a movable contact pin biased towards said video board; and

(b) a contact pad on said video board adjacent to said socket board and located so that said contact pin abuts thereto.

4. The video circuit enclosure of claim 3 wherein the video circuit includes one or more heat generating components, a heat sink attached to said video box, and said heat sink is being in thermal contact with said video circuit heat generating components.

5. The video circuit enclosure of claim 1 further including a chassis, a mounting for mounting the cathode ray tube to said chassis, and said video box mounted to said chassis separate from said cathode ray tube-to-chassis mounting.

6. The video circuit enclosure of claim 1 wherein said socket board is spaced from said video board approximately 0.250 inches.

7. A video circuit enclosure for attachment to a cathode ray tube, the cathode ray tube having a screen face and a neck extending away from the face, said neck having at least one conductive terminal for the cathode ray tube, the video circuit enclosure comprising:

(a) a video box formed of conductive material so as to form a shield, said box disposed over the portion of the cathode ray tube having the conductive terminals, said box forming an open face into which the cathode ray tube neck is inserted;

(b) a video board secured inside said video box, said video board including at least a video circuit for supplying signals to the cathode ray tube;

(c) a socket board disposed inside said video box and spaced away from said video board, said socket board having means for receiving the cathode ray tube conductive terminals so as to secure the socket board thereto, and having a contact pin assembly with at least one movable contact pin electrically connected to one of said cathode ray tube conductive terminals, said contact pin being biased towards said video board; and

(d) a conductive contact pad located on said video board adjacent said contact pin so that said contact pin abuts thereto so as to provide a conductive path between said video board and the cathode ray tube conductive terminals.

8. The video circuit enclosure of claim 7 wherein the video circuit includes one or more heat generating components, a heat sink attached to said video box, said heat sink being in thermal contact with said video circuit heat generating components.

9. The video circuit enclosure of claim 7 further including a video cover disposed over the open face of the video box in which the cathode ray tube is inserted, said video cover formed of conductive material and being attached to said socket board so that it is spaced away therefrom;

and said video cover forming a hole the cathode ray tube is disposed.

10. The video circuit enclosure of claim 7 further including a chassis, a mounting for mounting the cathode ray tube to said chassis, and said video box being mounted to said chassis separate from said cathode ray tube-to-chassis mounting.

11. The video circuit enclosure of claim 9 wherein said socket board is spaced from said video board approximately 0.250 inches.

12. A video display terminal comprising:

(a) a housing;

(b) a cathode ray tube mounted in said housing, said cathode ray tube having a screen face and a neck extending away from said face, said neck having at least one conductive terminal for said cathode ray tube;

(c) a video box mounted to said housing separate from said cathode ray tube, said video box disposed over the portion of said cathode ray tube having said conductive terminals and forming an open face into which said cathode ray tube neck is inserted, said video box formed of conductive material so as to form a shield;

(d) a video board secured inside said video box, said video board including at least a video circuit for supplying signals to said cathode ray tube;

(e) a socket board disposed inside said video box closely spaced from said video board, said socket board having a socket means for coupling to the cathode ray tube so that it is attached thereto and in electrical contact with the cathode ray tube terminal;

(f) an electrical connection means connected to said socket means able to maintain a conductive path for signal transfer between said video board and the cathode ray tube terminals when said video board and said socket board move relative to each other, and

(g) a video cover formed of conductive material disposed over said video box open face and forming an hole the cathode ray tube is positioned in, said video cover attached to said socket board and spaced away therefrom so that when said socket board is disposed in said video box, said video cover is in electrical contact with said video box.

13. The video display terminal of claim 12 wherein the video circuit includes one or more heat generating components, a heat sink attached to said video box, said heat sink being in thermal contact with said video circuit heat generating components.

14. The video display terminal of claim 12 wherein said electrical connection means comprises:

(a) a contact pin assembly secured to said socket board with a movable contact pin biased towards said video board; and

(b) a contact pad on said video board adjacent to said socket board and located so that said contact pin abuts thereto.

15. The video circuit enclosure of claim 14 further including a chassis inside said housing, the cathode ray tube mounted to said chassis, said video box being mounted to said chassis separate from said cathode ray tube-to-chassis mounting.

16. The video circuit enclosure of claim 12 wherein the video circuit includes one or more heat generating components, a heat sink attached to said video box, and said heat sink being in thermal contact with said video circuit heat generating components.

17. The video circuit enclosure of claim 12 further including a chassis inside said housing, a mount for mounting the cathode ray tube to said chassis, and said video box mounted to said chassis separate from said cathode ray tube-to-chassis mounting.

18. The video display terminal of claim 12 wherein said socket board is spaced from said video board approximately 0.250 inches.