US 8,011,988 B2Granted

Method for assembling indirectly-heated cathode assembly

AssigneeNissin Ion Equipment Co., Ltd.

InventorKenji Miyabayashi

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Abstract

A width of a groove of a cathode holder and a thickness of a cathode conductor are determined so that a dimension which is obtained by subtracting the thickness from the width is equal to a gap length which has a predetermined length, and which is between a filament and a cathode. Then, the cathode holder is rearward pushed to cause a front end face of the groove 26 to butt against the cathode conductor, and the cathode conductor and filament conductors are coupled and fixed to each other via an electrically insulating material. And then, the filament is forward moved to butt against the cathode, and the filament is fixed to the filament conductors. After that, the cathode holder is forward pulled to cause a projection to butt against the cathode conductor, and the cathode holder is fixed to the cathode conductor.

Claims2

Dependent claims

A method for assembling an indirectly-heated cathode assembly including:

a tubular cathode holder which, assuming that a side from which thermal electrons are emitted is a front side, supports a cathode that emits thermal electrons, at the front side;
a cathode conductor which supports said cathode holder;
a filament which heats said cathode;
and two filament conductors which support said filament, and which are juxtaposed with each other,
the method comprising steps of:
disposing a groove and a projection in an outer circumference of said cathode holder, said projection projecting from a rear end of said groove in a direction which perpendicularly intersects an axis of said cathode holder,
disposing an opening fitting a portion of said groove in said cathode conductor, a peripheral portion of said opening being engaged with said projection,
determining, in said groove, a width (W) between said projection and a front end face of said groove and a thickness (T) of said cathode conductor in the periphery of said opening so that a dimension (W−T) which is obtained by subtracting the thickness (T) from the width (W) is substantially equal to a predetermined gap length (G) which is between said filament and said cathode, and which extends in a direction along the axis of said cathode holder,
fitting the portion of said groove into said opening of said cathode conductor to attach said cathode holder to said cathode conductor,
rearward pushing said cathode holder to cause the front end face of said groove to butt against said cathode conductor,
coupling and fixing said cathode conductor and at least one of said two filament conductors to each other via an electrically insulating material,
forward moving said filament to butt against said cathode,
fixing said filament to said two filament conductors,
forward pulling said cathode holder to cause said projection to butt against said cathode conductor, and
fixing said cathode holder to said cathode conductor.

12 more elements

A method for assembling an indirectly-heated cathode assembly including:

a tubular cathode holder which, assuming that a side from which thermal electrons are emitted is a front side, supports a cathode that emits thermal electrons, at the front side;
a cathode conductor which supports said cathode holder;
a filament which heats said cathode;
and two filament conductors which support said filament, and which are juxtaposed with each other,
the method comprising steps of:
disposing a groove and a projection in an outer circumference of said cathode holder, said projection projecting from a rear end of said groove in a direction which perpendicularly intersects an axis of said cathode holder,
disposing an opening fitting a portion of said groove in said cathode conductor, a peripheral portion of said opening being engaged with said projection,
determining, in said groove, a width (W) between said projection and a front end face of said groove and a thickness (T) of said cathode conductor in the periphery of said opening so that a dimension (W−T) which is obtained by subtracting the thickness (T) from the width (W) is substantially equal to a predetermined gap length (G) which is between said filament and said cathode, and which extends in a direction along the axis of said cathode holder,
fitting the portion of said groove into said opening of said cathode conductor to attach said cathode holder to said cathode conductor,
coupling and fixing said cathode conductor and at least one of said two filament conductors to each other via an electrically insulating material,
rearward pushing said cathode holder to produce a state where the front end face of said groove butts against said cathode conductor,
forward moving said filament to butt against said cathode,
fixing said filament to said two filament conductors,
forward pulling said cathode holder to cause said projection to butt against said cathode conductor,
fixing said cathode holder to said cathode conductor.

12 more elements

Dependencies are inferred from the claim text.