Liquid cooling in projection cathode ray tubes

• US 4,405,949 A
• Filed: 03/22/1982
• Issued: 09/20/1983
• Est. Priority Date: 03/22/1982
• Status: Expired due to Fees

• Current Assignee: Zenith Radio Corporation
• Original Assignee: Zenith Radio Corporation
• Inventors: Strauss, Paul, Hockenbrock, Richard L.
• Primary Examiner(s): BRITTON, HOWARD W
• Application Number:
  US06/360,741
• Time in Patent Office: 547 Days
• Field of Search: 358/237, 358/242
• US Class Current: 348/749
• CPC Class Codes: H01J 29/006 Arrangements for eliminating unwanted temperature effects
• CPC Class Codes: H01J 29/861 Vessels or containers characterised by the form or the structure thereof
• CPC Class Codes: H04N 5/7408 Direct viewing projectors, e.g. an image displayed on a video CRT or LCD display being projected on a screen

Abstract

Cooling means are disclosed for cooling the face panel of a projection cathode ray tube. The cooling means comprises a housing having a rearwardly extending flange with a forwardly tapering section configured to nest with the forwardly tapering section of the face panel when mated therewith. The housing has a window section for framing and passing the image formed on a cathodoluminescent screen on the inner surface of the face panel. Spacing means are provided for spacing the window section of the housing from the face panel window section, and bonding means provide for bonding and hermetically sealing the tapering sections together. A cooling medium is located in the space between the windows for cooling the face panel. The tapering sections provide for mechanically attaching the housing and the tube into firm exact adjacency for sealing, in conjunction with the bonding means, the housing to the face panel, and for physically supporting the tube in conjunction with mounting ears in the corner regions of the housing.

Claims

1. Cooling means for cooling the face panel of a projection cathode ray tube, said face panel including a window section and a rearwardly extending flange having a forwardly tapering section, and a cathodoluminescent screen on the inner surface thereof for forming a television image, said cooling means comprising:

a housing having a rearwardly extending flange with a forwardly tapering section configured to nest with the forwardly tapering section of the face panel when mated therewith, said housing having a window section for framing and passing said image, and including tube mounting ears in the corner regions thereof for supporting said cathode ray tube;

spacing means for spacing said window section of said housing from said face panel window section

bonding means for bonding and sealing said tapering sections together;

a cooling medium located in the space between said windows for cooling the entirety said face panel;

such that said tapering sections provide for mechanically attaching said housing and said tube into firm exact adjacency for sealing, in conjunction with said bonding means, said housing to said face panel, and for physically supporting said tube in conjunction with said mounting ears.

2. Cooling means according to claim 1 wherein said face panel is round.

3. Cooling means according to claim 1 wherein said face panel is rectangular.

4. Cooling means for cooling the face panel of a rectangular projection cathode ray tube, said tube having a funnel joined to said face panel at a seal line, said face panel including a window section and a rearwardly extending flange having a forwardly tapering section, and a cathodoluminescent screen on the inner surface thereof for forming a television image, said cooling means comprising:

a stainless steel, sheet-metal housing having a rearwardly extending flange for covering said seal line, and a forwardly tapering section configured to nest with the forwardly tapering section of the face panel when mated therewith, said housing having a window section recessed in said housing for passing said image, and including mounting ears in the corner regions for supporting said cathode ray tube;

spacing means for spacing said window section of said housing from said face panel window section;

bonding means for bonding sealing said tapering sections together;

a cooling medium located in the space between said windows for cooling the entirety of said face panel;

such that said tapering sections provide for mechanically attaching said housing and said tube into firm exact adjacency for sealing, in conjunction with said bonding means, said housing to said face panel; and

for physically supporting said tube in conjunction with said mounting ears; and

said rearwardly extending flange provides for shielding against X-radiation from said seal line.