US 4,789,807 AGranted

Electron gun assembly having a reinforced heater tab

AssigneeRCA Licensing Corporation

InventorJohn R. Hale

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Abstract

An electron gun assembly for use in a CRT includes a pair of insulating support rods, at least one indirectly heated cathode disposed between the support rods, a heater for the cathode and an improved heater tab. The heater includes a pair of heater legs which are attached to the heater tab. Heater bead straps are provided for attaching the heater tab to the support rods. The electron gun also includes a plurality of electrodes for focusing and accelerating an electron beam generated by the cathode. The improved heater tab comprises a main body portion including a first and a second part. Each of the parts is attached to one of the heater legs. The heater tab has a pair of outwardly directed feet each of which is connected to one of the parts of the main body portion by a pair of substantially orthogonal legs extending therebetween. The heater tab includes reinforcing gussets extending between the parts of the main body portion and the legs and between the legs and the feet to maintain the rigidity of the heater tab.

Claims4

Dependent claims

In an electron gun assembly for use in a cathode-ray tube, said gun assembly including a pair of insulating support rods, at least one indirectly heated cathode for generating an electron beam, said cathode being disposed between said support rods, a heater for said cathode, said heater having a pair of heater legs, a heater tab, strap means for attaching said heater tab to said support rods, and a plurality of electrodes for focusing and accelerating said electron beam, the improvement wherein said heater tab comprises

a main body portion including a first and a second part, each of said parts being attached to a respective leg of said pair of legs of said heater, said heater tab having a pair of outwardly directed feet each of which is connected to a respective part of the parts of said main body portion by a pair of substantially orthogonal legs extending therebetween, said heater tab including primary reinforcing means comprising gussets formed therein, said gussets extending between said parts of said main body portion and said orthogonal legs, and also between said orthogonal legs and said feet to maintain the rigidity of said heater tab, wherein each of said feet of said heater tab includes secondary reinforcing means comprising a stamped portion formed into a surface thereof to flatten said feet to facilitate connection to said strap means and to provide stability to said heater tab.

In an electron gun assembly for use in a cathode-ray tube, said gun assembly including a pair of insulating support rods, three inline indirectly heated cathodes including a center cathode and two outer cathodes for generating three electron beams, attachment means for attaching said cathodes to said support rods, a heater for each of said cathodes, each of said heaters having a pair of heater legs, heater tab means attached to said heater legs, oppositely disposed pairs of heater bead straps for attaching the heater tab means to said support rods, and a plurality of electrodes for focusing and accelerating said electron beams, the improvement wherein the heater tab means comprises

a pair of reinforced heater tabs associated with said outer cathodes and a conformal heater tab associated with said center cathode, each of said heater tabs having a main body portion including a first and a second part, each of said parts being attached to a respective part one leg of one of said heaters, each of said heater tabs having a pair of outwardly directed feet each being connected to one of the parts of said main body portion by a pair of orthogonal legs extending therebetween, said reinforced heater tabs including primary and secondary reinforcing means, said primary reinforcing means extending between said parts of said main body portion and said orthogonal legs, and also primary reinforcing means extending between said orthogonal legs and said feet to maintain the rigidity of said reinforced heater tabs, said secondary reinforcing means being formed into a surface of each of said feet to flatten said surface of said feet, said feet of said reinforced heater tabs being affixed to a different one of said oppositely disposed pairs of heater bead straps to provide a substantially rigid box-like structure, said feet of said conformal heater tab being attached to one of said orthogonal legs of each of said reinforced heater tabs, said conformal heater tab being disposed between said reinforced heater tabs.

Dependencies are inferred from the claim text.