Pulse generator including coaxial type capacitor

A pulse generator comprising a coaxial type capacitor, said capacitor including at least a first capacitor which discharges a charge accumulated therein when a pulse is generated and a second capacitor which adjusts a waveform of a pulse to be outputted,

• wherein said coaxial type capacitor includes at least said first and second capacitors, and also third to fifth capacitors, said five capacitors being arranged coaxially with each other in that order,
• wherein said first, third and fifth capacitors are connected in parallel with each other to form the discharging capacitor of the pulse generator,
• wherein said second and fourth capacitors are connected in parallel with each other to form the waveform adjusting capacitor,
• wherein currents in said first, third and fifth capacitors flow in a direction opposite to that of currents in said second and fourth capacitors when a pulse is generated, and further comprising:
• charging and switching means for charging and discharging said first capacitor and thereby forming an output current pulse of said pulse generator.

A pulse generator comprising:

• a first charging capacitor having a cylindrical structure;
• a waveform adjusting capacitor having a cylindrical structure arranged coaxially with said first charging capacitor;
• a second charging capacitor having a cylindrical structure arranged coaxially with said first charging capacitor and said waveform adjusting capacitor;
• a pair of conductive shield means each having two ends and being inserted respectively between said first charging capacitor and said waveform adjusting capacitor, and between said waveform adjusting capacitor and said second charging capacitor, each of said conductive shield means being insulated from both of said capacitors between which is it inserted;
• a cylindrical metal case containing said three capacitors and said conductive shield means therein and having respective openings at its two ends;
• first cover means covering one of said openings of said metal case and having first, second and third terminal groups thereon, said first and second terminal groups being connected respectively to a first electrode of each of said first and second charging capacitors, said third terminal group being connected to a first electrode of said waveform adjusting capacitor and to one end of each said conductive shield means;
• second cover means covering the other opening of said metal case and having thereon a fourth terminal group connected to the other ends of said conductive shield means, said second cover means being connected to second electrodes of said first and said second charging capacitors and said waveform adjusting capacitor;
• switch means having first and second contacts, said second contact being connected to said first and second terminal groups, for being turned on to discharge said first and second charging capacitors by bringing said two contacts together;
• a first resistance connected between said third terminal group and the first contact of said switch means;
• and
• a second resistance connected between said second cover means and said fourth terminal group;
• wherein an output pulse of said pulse generator appears between said fourth terminal group and said metal case;
• and
• wherein currents in said first and second charging capacitors flow in an opposite direction to that of a current in said waveform adjusting capacitor when an output pulse is generated.

A pulse generator comprising:

• capacitor means comprising charging means for being charged by having a voltage applied thereto;
• and waveform adjusting means for shaping a waveform of a current pulse discharged from said capacitor means;
• wherein said charging means comprises a first charging capacitor having a cylindrical structure, said waveform adjusting means comprises a waveform adjusting capacitor having a cylindrical structure arranged coaxially with said first charging capacitor, and said charging means further comprises a second charging capacitor having a cylindrical structure arranged coaxially with said first charging capacitor and said waveform adjusting capacitor;
• conductive shield means within said capacitor means for reducing stray capacitance therein;
• charging and switching means for charging and discharging said charging means;
• and
• resistance means for inhibiting oscillation in said pulse generator and for grounding said discharged current pulse to form a voltage pulse output;
• wherein currents in said first and second charging capacitors flow in an opposite direction to that of a current in said waveform adjusting capacitor when an output pulse is generated.