Uniform raster pattern generating system
First Claim
Patent Images
1. A uniform density raster pattern generating system comprising:
- A) a particle beam generator;
B) at least one magnet directing the trajectory of a particle beam generated by said particle beam generator;
C) a magnet powering circuit comprising;
i) a low-power power amplifier driving each of said at least one magnet;
ii) a resonant mode amplifier circuit between said low-power power amplifier and said at least one magnet for stepping up power from said power amplifier to said at least one magnet; and
iii) a device selected from the group consisting of;
a) an amplitude modulator; and
b) a triangular current source biasing a diode, that induces a homogeneous amplitude function proportional to (t)½
on the waveform of power supplied from said power amplifier; and
D) a control device that serves to maintain the balance of said magnet powering circuit.
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Abstract
A conventional particle generation and magnet configuration are used in combination with a relatively low-power power amplifier, a resonant loop magnet driver system, an amplitude modulator that induces a homogeneous amplitude function proportional to (t)½ and, when individual X and Y magnets are used, a precision phase shifter that induces a 90° phase shift in the applied power to one of the magnets to produce a circular raster pattern of virtually uniform density.
53 Citations
19 Claims
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1. A uniform density raster pattern generating system comprising:
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A) a particle beam generator;
B) at least one magnet directing the trajectory of a particle beam generated by said particle beam generator;
C) a magnet powering circuit comprising;
i) a low-power power amplifier driving each of said at least one magnet;
ii) a resonant mode amplifier circuit between said low-power power amplifier and said at least one magnet for stepping up power from said power amplifier to said at least one magnet; and
iii) a device selected from the group consisting of;
a) an amplitude modulator; and
b) a triangular current source biasing a diode, that induces a homogeneous amplitude function proportional to (t)½
on the waveform of power supplied from said power amplifier; and
D) a control device that serves to maintain the balance of said magnet powering circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
A) an impedance converter; and
B) a capacitor bank operating at resonant frequency.
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3. The uniform density raster pattern generating system of claim 2 wherein said impedance converter comprises a toroid transformer.
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4. The uniform density raster pattern generating system of claim 3 wherein said toroid transformer is a ferrite toroid transformer.
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5. The uniform density raster pattern generating system of claim 4 wherein said toroid transformer is a ferrite toroid transformer having a ratio of primary winding to secondary winding of 10:
- 1.
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6. The uniform density raster pattern generating system of claim 5 wherein said ferrite toroid transformer comprises a pair of ferrite toroid transformers each having an I.D. of 5.5 cm stacked together.
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7. The uniform density raster pattern generating system of claim 2 wherein said capacitor bank comprises a series of snubber capacitors.
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8. The uniform density raster pattern generating system of claim 7 wherein said impedance converter is a toroid transformer.
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9. The uniform density raster pattern generating system of claim 7 wherein said snubber capacitors are polypropylene snubber capacitors.
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10. The uniform density raster pattern generating system of claim 2 further including a current probe that detects the current flow in said resonant mode amplifier circuit and communicates the same to said control device.
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11. The uniform density raster pattern generating system of claim 2 operating at a frequency of about 24 kHz.
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12. A uniform density raster pattern generating system comprising:
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A) a particle beam generator;
B) a pair of magnets individually directing the trajectory of a particle beam generated by said particle generator in the X and Y directions;
C) a magnet powering circuit comprising;
i) a device selected from the group consisting of;
a) an amplitude modulator; and
b) a triangular current source biasing a diode, that induces a homogeneous amplitude function proportional to (t)½
on the waveform of;
ii) a main waveform generator output whose signal is split between individual low-power power supplies feeding power via individual resonant mode amplifier circuits to each of said magnets; and
iv) a precision phase shifting device in one portion of said split signal that shifts the phase of that signal 90°
; and
D) a control device connected to said amplitude modulator and said main waveform generator that controls said uniform density particle beam raster system. - View Dependent Claims (13, 14, 15, 16, 17, 18)
A) an impedance converter; and
B) a capacitor bank operating a resonant frequency.
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14. The uniform density raster pattern generating system of claim 13 wherein said impedance converter comprises a toroid transformer.
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15. The uniform density raster pattern generating system of claim 14 wherein said toroid transformer comprises a ferrite toroid transformer having a ratio of primary to secondary windings of 10:
- 1.
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16. The uniform density raster pattern generating system of claim 15 wherein said ferrite toroid transformer comprises a pair of ferrite toroid transformers each having an I.D. of 5.5 cm stacked together.
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17. The uniform density raster pattern generating system of claim 14 wherein said capacitor bank comprises a series of snubber capacitors.
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18. The uniform density raster pattern generating system of claim 12 operating at a frequency of about 24 kHz.
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19. A method for producing a uniform density raster pattern in a device comprising a particle beam generator and at least one magnet directing the trajectory of a particle beam generated by said particle beam generator comprising the steps of:
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A) generating a homogeneous amplitude function proportional to (t)½
;
C) feeding said homogeneous amplitude function proportional to (t)½
to a power amplifier connected to said magnet in series via a resonant mode amplifier circuit so as to control the amplitude of the output of said power amplifier;
D) powering said magnet with said power amplifier; and
E) controlling the operation of said magnet using a control device.
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Specification