Cooling system for projection television receiver

• US 4,737,678 A
• Filed: 08/05/1986
• Issued: 04/12/1988
• Est. Priority Date: 08/06/1985
• Status: Expired due to Fees

• Current Assignee: Pioneer Electronics (USA) Incorporated (Pioneer Corporation)
• Original Assignee: Pioneer Electronics (USA) Incorporated (Pioneer Corporation)
• Inventors: Hasegawa, Shinichi
• Primary Examiner(s): Moore, David K.
• Assistant Examiner(s): O'Shea, Sandra L.
• Application Number:
  US06/893,278
• Time in Patent Office: 616 Days
• Field of Search: 313/35, 313/36, 313/44, 313/46, 313/477 R, 358/250, 220/21 A
• US Class Current: 313/36
• CPC Class Codes: H01J 29/006 Arrangements for eliminating unwanted temperature effects

Abstract

A cooling system for a projection television receiver, the receiver having at least one cathode ray tube with a face thereon, comprising a lens for focusing light exiting from the tube; a frame supporting the lens in alignment with the face of the tube for defining a cooling chamber between the lens and the face with a fluid therein; and seals for sealing the tube and the lens to the frame in a fluid-tight manner and essentially preventing gas from the fluid sealed in the chamber from exiting the chamber. The seals are preferably of a material which is essentially, impermeable to the passage of the gas, such as co-vulcanized ethylene propylene rubber and polydimethyle siloxane.

Claims

1. A cooling system for a projection television receiver, the receiver including at least one cathode ray tube having a face, comprising:

a lens for focusing light existing from said tube;

frame means for supporting said lens in alignment with the face of said tube for defining a cooling chamber between said lens and said face;

sealing means, including a pressing plate and means for exerting uniform pressure by said pressing plate against a packing disposed between said tube and said pressing plate, for sealing said tube and said lens to said frame means in a fluid-tight manner and essentially preventing gas from existing said cooling chamber; and

means for filling said chamber with a coolant, wherein said frame means includes an upper side wall having double taper surfaces adjacent said filling means.

2. The cooling system of claim 1 wherein said frame means includes a frame having opposing open sides for receiving said tube face and said lens in close-fitting relation, respectively, and said sealing means includes first and second seals, for sealing the adjacent surfaces between said face and said frame, and said lens and said frame, respectively.

3. The cooling system of claim 2 wherein said seals each comprise a material which is essentially impermeable to the passage of gas.

4. The cooling system of claim 3 wherein said seals are co-vulcanized material of ethylene propylene rubber and polydimethyl siloxane.

5. The cooling system of claim 4 wherein the quantity of ethylene propylene rubber in said seals is in the range of about 50 to 95% by weight.

6. The cooling system of claim 4 wherein the quantity of polydimethyl siloxane is less than about 10% by weight.