US3764740A
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US
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Cathode-ray-tube-yoke combination with at least two spaced bodies of orangic thermoplastic material therebetween and a method of making said combination
Abstract Combination comprises a cathode-ray tube, a magnetic deflection yoke in operative releationship with the tube and at least two spaced bodies of organic thermoplastic material positioned between the yoke and the tube, the bodies filling less than 20 percent of the total volume in the space between the tube and the yoke. Method comprises placing a yoke in a predetermined spaced position with respect to a tube to provide a desired operative relationship therebetween. At least two substantially closed volumes are then defined between the yoke and the tube, the volumes enclosing less than 20 percent of the total volume in the spaced between the tube and the yoke. The defined volumes are substantially filled with heated liquid thermoplastic material, while the yoke and the tube are maintained at a temperature below about 50*C. The thermoplastic material is then permitted to cool and harden to a solid, which occurs at about 100*C.
The combination defined in claim 1 wherein each of said bodies is about 0.20 to 0.500 inch wide by 0.650 to 0.375 inch thick by 2.500 to 4.250 inches long.
Claim 2
Dependent Claim
39 words
The combination defined in claim 1 wherein said yoke includes four groups of wires substantially parallel to the longitudinal axis of said tube, said bodies comprising a strip of material positioned between each of said groups and said tube.
Claim 3
Dependent Claim
23 words
The combination defined in claim 1 including d. means between said yoke and said tube defining the position of each of said bodies.
Claim 4
Dependent Claim
29 words
The combination defined in claim 1 wherein said organic thermoplastic material is a hot-melt adhesive which is solid at a temperature of about 100*C and melts at about 150*C.
Claim 5
Dependent Claim
26 words
The combination defined in claim 5 wherein said spaced bodies of organic material provide movement of said yoke with respect to said tube during temperature variations.
Claim 6
Independent Claim
131 words
A method of fixedly attaching a yoke in a predetermined, spaced position on a cathode-ray tube comprising the steps of a. placing said yoke in said predetermined, spaced position with respect to said tube to provide a Desired operative relationship therebetween, b. defining at least two substantially closed volumes between said yoke and said tube, said volumes enclosing less than 20 percent of the total volume in the space between said yoke and said tube, c. heating an organic thermoplastic material to form a liquid thereof, d. substantially filling said defined volumes with heated liquid thermoplastic material, e. during step (d) maintaining said yoke and tube at a temperature below about 50*C f. and then permitting said thermoplastic material to cool and harden to a solid which occurs at about 100*C.
Claim 7
Dependent Claim
29 words
The method defined in claim 7 wherein step (f) includes hardening by directing cooling air between said yoke and said tube, said hardening occurring in less than 30 seconds.
Claim 8
Dependent Claim
29 words
The method defined in claim 7 wherein said organic thermoplastic material is a hot-melt adhesive which is solid at a temperature of about 100*C and melts at about 150*C.