Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Utilizing plasma – electric – electromagnetic – particulate – or...
Patent
1987-01-15
1988-07-19
Sever, Frank
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Utilizing plasma, electric, electromagnetic, particulate, or...
264 26, 264 27, 4251746, 4251748E, B29D 1100
Patent
active
047583860
ABSTRACT:
A system is provided for forming an end of an optical fiber into a lens, using a high frequency AC electric arc of predetermined frequency, which avoids the creation of harmonic frequencies that could degrade the finished lens. An arc is established between a pair of electrodes, wherein the arc current varies substantially sinusoidally, to minimize the amplitude of harmonic frequencies. Voltage pulses are delivered to a primary of a transformer, while the secondary of the transformer is coupled through a capacitor to one electrode, and the other electrode is coupled back to the secondary of the transformer. The inductance of the secondary winding plus the reflected inductance of the primary winding, when combined with the capacitance, results in a resonant circuit, which generates a sinusoidal output when excited at its resonant frequency. The square waves inputted to the transformer primary are at a frequency approximately equal to the resonant frequency of the resonant circuit.
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"Fusion Mass Splices for Optical Fibers Using High-Frequency Discharge", Journal of Lightwave Technology, vol. L+2, #1, Feb. 1984, Tachikura et al., pp. 25-31.
Peterson T. L.
Sever Frank
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