What is claimed is:
1. A cavity-preventing type reactor, comprising:
an introduction part having a reactant inlet through which a reactant is introduced into the reactor,
a reaction part; and
at least one cavity-preventing structure, wherein
the introduction part and the reaction part are adjacent and separated by a wall having a reactant flow path through which the introduction part is in communication with the reaction part, and
the at least one cavity-preventing structure having at least one reactant flow path and disposed in the flow path of the reactant between the reaction part and the reactant inlet of the introduction part to allow the reactant to flow from the introduction part to the reaction part while preventing a cavity from extending into the reaction part during rotation of the reactor.
2. The cavity-preventing type reactor as claimed in claim 1, wherein the shape of the cavity-preventing structure is cylindrical or plate-like.
3. The cavity-preventing type reactor as claimed in claim 1, wherein the reactor is made of glass, quartz, ceramics or plastics.
4. The cavity-preventing type reactor as claimed in claim 1, wherein a radius of the reactor is between approximately 1 and 10 cm and a length of the reactor is 100 cm or less.
5. A method for fabricating a preform for a plastic optical fiber using a cavity-preventing type reactor having a reactant introduction part, a reaction part, and at least one cavity-preventing structure interposed therebetween, comprising:
filling the reaction part and the introduction part of the reactor with a reactant; and
polymerizing the reactant in the reaction part under the rotation of the reactor.
6. The method for fabricating a preform for a plastic optical fiber as claimed in claim 5, further comprising charging and pressurizing unoccupied space in the introduction part with inert gas.
7. The method for fabricating a preform for a plastic optical fiber as claimed in claim 6, further comprising pressurizing both an inner part and an outer part of the cavity-preventing type reactor.
8. The method for fabricating a preform for a plastic optical fiber as claimed in claim 5, wherein the reactor is rotated at a constant or varying speed.
9. The method for fabricating a preform for a plastic optical fiber as claimed in claim 8, wherein the varying speed of rotation of the reactor follows a simple repetition of rotating and stopping, a sinusoidal function or a function whose period, phase andor amplitude is varied.
10. The method for fabricating a preform for a plastic optical fiber as claimed in claim 5, wherein the reactant is a monomer mixture comprised of at least two kinds of monomers having a different refractive index relative to each other, a polymerization initiator and a chain transfer agent.
11. The method for fabricating a preform for a plastic optical fiber as claimed in claim 10, wherein the at least two kinds of monomers are two monomers wherein one monomer has a higher refractive index and a lower density than the other monomer, and the monomer mixture comprised of the two kinds of monomers, a polymerization initiator and a chain transfer agent are charged into the introduction part and the reaction part of the reactor.
12. The method for fabricating a preform for a plastic optical fiber as claimed in claim 10, wherein a monomer mixture filling the introduction part has a refractive index that is higher than that of a monomer filling the reaction part.
13. The method for fabricating a preform for a plastic optical fiber as claimed in claim 10, wherein crushed fragements of a polymer having a lower refractive index than that of the monomer mixture is swelled or dissolved in the monomer mixture before the monomer mixture is introduced to the reaction part.
14. The method for fabricating a preform for a plastic optical fiber as claimed in claim 10, wherein a prepolymer having a lower refractive index than that of the monomer mixture is dissolved in the monomer mixture or partially filled with the reaction part before the monomer mixture is introduced to the reaction part.
15. The method for fabricating a preform for a plastic optical fiber as claimed in claim 10, wherein the at least two kinds of monomers are selected from the group consisting of methylmethacrylate, benzylmethacrylate, phenylmethacrylate, 1-methylcyclohexylmethacrylate, cyclohexylmethacrylate, chlorobenzylmethacrylate, 1-phenylethylmethacrylate, 1,2-diphenylethylmethacrylate, diphenylmethylmethacrylate, furfurylmethacrylate, 1-phenylcyclohexylmethacrylate, pentachlorophenylmethacrylate, pentabromophenylmethacrylate, styrene, TFEMA(2,2,2-trifluoroethylmethacrylate), PFPMA (2,2,3,3,3-pentafluoropropylmethacrylate), HFIPMA(1,1,1,3,3,3-hexafluoroisopropylmethacrylate) and HFBMA(2,2,3,3,4,4,4-heptafluorobuthylmethacrylate).
16. The method for fabricating a preform for a plastic optical fiber as claimed in claim 13, wherein the polymer is a homopolymer of a monomer selected from the group consisting of methylmethacrylate, benzylmethacrylate, phenylmethacrylate, 1-methylcyclohexylmethacrylate, cyclohexylmethacrylate, chlorobenzylmethacrylate, 1-phenylethylmethacrylate, 1,2-diphenylethylmethacrylate, diphenylmethylmethacrylate, furfurylmethacrylate, 1-phenylcyclohexylmethacrylate, pentachlorophenylmethacrylate, pentabromophenylmethacrylate, styrene, TFEMA(2,2,2-trifluoroethylmethacrylate), PFPMA(2,2,3,3,3-pentafluoropropylmethacrylate), HFIPMA(1,1,1,3,3,3-hexafluoroisopropylmethacrylate) and HFBMA(2,2,3,3,4,4,4-heptafluorobuthylmethacrylate).
17. The method for fabricating a preform for a plastic optical fiber as claimed in claim 13, wherein the polymer is a copolymer selected from the group consisting of methylmethacrylate(MMA)-benzylmethacrylate(BMA) copolymer, styrene-acrylonitrile copolymer (SAN), MMA-TFEMA (2,2,2-trifluoroethylmethacrylate) copolymer, MMA-PFPMA(2,2,3,3,3-pentafluoropropylmethacrylate) copolymer, MMA-HFIPMA(1,1,1,3,3,3-hexafluoroisopropylmethacrylate) copolymer, MMA-HFBMA(2,2,3,3,4,4,4-heptafluorobuthylmethacrylate) copolymer, TFEMA-PFPMA copolymer, TFEMA-HFIPMA copolymer, styrene-methylmethacrylate copolymer and TFEMA-HFBMA copolymer.
18. The method for fabricating a preform for a plastic optical fiber as claimed in claim 14, wherein the prepolymer is made from one or more monomers selected from the group consisting of methylmethacrylate, benzylmethacrylate, phenylmethacrylate, 1-methylcyclohexylmethacrylate, cyclohexylmethacrylate, chlorobenzylmethacrylate, 1-phenylethylmethacrylate, 1,2-diphenylethylmethacrylate, diphenylmethylmethacrylate, furfurylmethacrylate, 1-phenylcyclohexylmethacrylate, pentachlorophenylmethacrylate, pentabromophenylmethacrylate, styrene, TFEMA(2,2,2-trifluoroethylmethacrylate), PFPMA(2,2,3,3,3-pentafluoropropylmethacrylate), HFIPMA(1,1,1,3,3,3-hexafluoroisopropylmethacrylate) and HFBMA(2,2,3,3,4,4,4-heptafluorobuthylmethacrylate).
19. The method for fabricating a preform for a plastic optical fiber as claimed in claim 14, wherein the prepolymer has a viscosity of from 500 to 500,000 cps at 25 C.
20. The method for fabricating a preform for a plastic optical fiber as claimed in claim 5, wherein the reactant of the reaction part is polymerized through thermal polymerization or UV photopolymerization.
21. The method for fabricating a preform for a plastic optical fiber as claimed in claim 5, wherein the reactor is rotated while set to an angle of from 90 to 90 degrees relative to the horizontal surface.
The claims below are in addition to those above.
All refrences to claims which appear below refer to the numbering after this setence.
1. A method, comprising:
switching a power switch of a power supply regulator at an operating frequency (f) during operation of the power supply regulator; and
controlling a current through the power switch to keep the current through the power switch below a peak current limit threshold (Ip) during operation of the power supply regulator, wherein a maximum deliverable power value of a power supply to be regulated by the power supply regulator is controlled by trimming of the power supply such that the operating frequency (f) and the peak current limit threshold (Ip) are substantially dependent upon each other.
2. The method of claim 1 wherein the maximum deliverable power value of the power supply is substantially constant with a maximum deliverable power value of another power supply.
3. The method of claim 1 wherein the trimming of the power supply includes trimming at least one of the operating frequency (f) and the peak current limit threshold(Ip) during manufacture of the power supply such that a product Ipm\xb7fn is substantially constant.
4. The method of claim 3 wherein m is substantially equal to 2 and n is substantially equal to 1.
5. The method of claim 1 wherein the trimming of the power supply comprises trimming a frequency trim circuit coupled to an oscillator and trimming a peak current limit threshold trim circuit coupled to a current limit circuit.
6. The method of claim 5 wherein the operating frequency (f) is an operating frequency of the oscillator that is determined in response to the frequency trim circuit and the peak current limit threshold (Ip) is determined in response to the peak current limit threshold trim circuit.
7. The method of claim 1 wherein the operating frequency (f) is substantially constant during operation under substantially all operating conditions of the power supply regulator.
8. The method of claim 1 wherein the operating frequency (f) is substantially constant during operation under a fixed range of operating conditions of the power supply regulator.
9. The method of claim 1 wherein the power supply is a flyback converter power supply.
10. The method of claim 1 wherein the power supply is buck converter power supply.