Flat tension mask cathode ray tube implosion system
AssigneeZenith Electronics Corporation
InventorsLawrence W. Dougherty, Sae D. Lee, Melvin F. Rogers
Life of this patent
Estimating the term…
Abstract
A CRT implosion protection system having a resin system releasably bonding an implosion panel to the faceplate of a flat or concave CRT and a tension band system secured around the periphery of the faceplate which exerts compression thereon. The tension band system includes a pair of keeper bars which prevent the tension band from slipping, and which secure an external magnetic shield to the CRT.
Claims18
A flat tension mask cathode ray tube comprising a brittle faceplate member, an implosion protection panel member, an adhesive system bonding said panel member to said faceplate member, and a tension band system around the periphery of said faceplate member which exerts compression on said faceplate member.
A flat tension mask cathode ray tube comprising a brittle faceplate member, an implosion protection panel member, an adhesive system bonding said panel member to said faceplate member which adheres substantially more strongly to one of said members than to the other, and a tension band system around the periphery of said faceplate member which exerts compression on said faceplate member, said adhesive system comprising at least one layer of adhesive material adhered to one of said members and a release layer between said adhesive layer and the other of said members.
A flat tension mask cathode ray tube comprising a brittle faceplate member, an implosion protection panel member, an adhesive system bonding said panel member to said faceplate member which adheres substantially more strongly to one of said members than to the other, and a tension band system around the periphery of said faceplate member which exerts compression on said faceplate member, said adhesive system comprising at least one layer of adhesive material adhered to said panel member and a release layer between said adhesive layer and said faceplate member.
A flat tension mask cathode ray tube comprising a brittle faceplate member an implosion protection panel member, an adhesive system bonding said panel member to said faceplate member which adheres substantially more strongly to one of said members than to the other, and a tension band system around the periphery of said faceplate member which exerts compression on said faceplate member, said tension band system comprising a band member encircling said faceplate periphery and means for keeping said band member in tension thereabout.
A flat tension mask cathode ray tube comprising a brittle faceplate member, an implosion protection panel member, an adhesive system bonding said panel member to said faceplate member, and a tension band system around the periphery of said faceplate member which exerts compression on said faceplate member, said tension band system comprising a band member and at least one keeper means placed on at least one side of said faceplate member and disposed between said tension band and said side of said faceplate member, said keeper means having fastening means to secure said keeper means to said faceplate member and to secure said keeper means to said tension band.
A flat tension mask cathode ray tube comprising a brittle faceplate member, an external magnetic shield, an implosion protection panel member, an adhesive system bonding said panel member to said faceplate member which adheres substantially more strongly to one of said members than to the other, a tension band system around the periphery of said faceplate member which exerts compression on said faceplate member and comprises means securing said external magnetic shield to said cathode ray tube, said tension band system including a tension band member keeper means disposed on opposing sides of said faceplate member between said faceplate member and said tension band member.
An evacuated display device comprising a brittle faceplate member, an external magnetic shield, an implosion protection panel member, an adhesive system bonding said panel member to said faceplate member which adheres substantially more strongly to one of said members than to the other, a tension band system around the periphery of said faceplate member which exerts compression on said faceplate member and comprises means securing said external magnetic shield to said evacuated display device, said tension band system including a tension band member keeper means disposed on opposing sides of said faceplate member between said faceplate member and said tension band member, wherein said external magnetic shield comprises aperture means, and said means for securing said external magnetic shield comprises at least one pair of protrusions on said keeper means receivable by said aperture means.
An evacuated display device comprising a brittle faceplate member, an implosion protection panel member, an adhesive system bonding said panel member to said faceplate member which adheres substantially more strongly to one of said members than to the other, a tension band system secured around the periphery of the faceplate member putting the faceplate member in compression, and an external magnetic shield secured on the evacuated display device by the tension band system, the adhesive system comprising a single layer of resin and a release agent between the faceplate member and the resin layer, said tension band system comprising keeper means secured on opposite sides of the faceplate member and a tension band member around the periphery of the faceplate member, said keeper means also being secured to the tension band member, the external magnetic shield having means interposed between the keeper means and the tension band member and interengaging with said keeper means, thereby locking the external magnetic shield to the device.
A method of manufacturing a flat tension mask cathode ray tube having a faceplate member and an implosion panel member, comprising the steps of:
- applying a resin-release agent to the outer face of the faceplate member;
- applying an ultraviolet-curable adhesive resin to the faceplate member over the release agent and placing the implosion panel member on top of the resin;
- ultraviolet-curing the resin to provide a releasable bond between the faceplate member and the implosion panel member;
- applying a double-stick tape to the periphery of the faceplate member;
- securing at least one keeper means to at least one peripheral side of the faceplate member;
- wrapping a thin tension band around the keeper means and around the periphery of the faceplate member, and securing the tension band to the keeper means;
- and
- securing the tension band so that it is in tension around the faceplate member.
A method of manufacturing a cathode ray tube having a faceplate member, an implosion panel member, and an external magnetic shield, comprising the steps of:
- securing the implosion panel member to the front surface of the faceplate member;
- securing keeper means to the periphery of the faceplate member, the keeper means comprising means for attachment to the faceplate member and to the magnetic shield;
- placing the external magnetic shield around the cathode ray tube and in engagement with the attachment means of the keeper means;
- placing a tension band member around the keeper means and around the periphery of the faceplate member and engaging the tension band member with the attachment means of the keeper means;
- and securing the tension band member so that it is in tension around the faceplate member.
Dependencies are inferred from the claim text.