Coaxial type capacitor for pulse generator

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG.
1 shows a vertical cross section of a coaxial type capacitor according to one preferred embodiment of the present invention.
FIG.
2 shows a horizontal cross section along line II--II in FIG.
1 and FIG.
3 shows a plan view of the coaxial type capacitor.
The coaxial type capacitor according to the present invention is essentially comprised of three cylindrical film capacitors C.
sub.
O1, C.
sub.
f and C.
sub.
O2 having been arranged coaxially.
The structure of each film capacitor itself is well known to those skilled in the art.
The inner capacitor C.
sub.
O1 fixed around a pipe-like bobbin 11 made of resin and the outer capacitor C.
sub.
O2 arranged around the intermediate C.
sub.
f are connected with each other so as to form one capacitor C.
sub.
O (hereinafter, referred to the first capacitor Co), which is equivalent to the discharge capacitor Co shown in FIG.
13.
The intermediate capacitor C.
sub.
f (hereinafter referred to the second capacitor) arranged between the inner and outer capacitors C.
sub.
O1 and C.
sub.
O2 is also equivalent to the capacitor C.
sub.
f shown in FIG.
8.
These three film capacitor C.
sub.
O1, C.
sub.
f and C.
sub.
O2 can be made separately and, thereafter, assembled to form a coaxial capacitor unit.
The coaxial capacitor unit comprised of the first and second capacitors Co and Cf is contained in a cylindrical metal case 12.
The metal case 12 has a cylindrical pipe 13 coaxially inserted at the center thereof.
The bobbin 11 of the inner capacitor C.
sub.
O1 is fitted to the pipe 13 from the outside thereof and, thereby, the coaxial capacitor unit is supported by the pipe 13.
A respective first electrode of each of the pairs of electrodes of the capacitors C.
sub.
O1, C.
sub.
f and C.
sub.
O2 is bonded to a base plate 12a of the metal case 12 with solder 14.
As shown in FIGS.
1 and 3, on a cover plate 12b of the metal case 12, eight output terminals 15 for the first capacitor Co are arranged at a predetermined distance from the center of the plate 12b and at an equal angular pitch and, also, eight output terminals 16 for the second capacitor C