There is obtained a laser processing method by which an excellent shape of a cut surface can be achieved and an increase in cost can be suppressed. A laser processing method includes the steps of: preparing a material to be processed; and forming a modified area in the material to be processed, by irradiating the material to be processed with laser beam. In the aforementioned step, pulsed laser beam having a continuous spectrum is focused with a lens, thereby forming a focusing line constituted by a plurality of focuses that are obtained by predetermined bands forming the continuous spectrum of the laser beam, and the material to be processed is irradiated with the laser beam such that at least a part of the focusing line is located on a surface of the material to be processed, thereby forming the modified area on an axis of the focusing line.

Laser processing method

This paper describes a receiver front-end that is designed to realize multi-gigabit data communication via large-core plastic optical fiber (POF) in deep submicron CMOS technology A 3D system-level integration scheme and transistor level circuits have been proposed for such a low-cost, high-speed POF receiver With 44 mW (excluding output driver) DC power dissipated from a 12 V supply and an estimated 13 pF photo capacitance (C PD ) from a discrete, large-area (400 um) photo detector (PD), a data rate of 3 Gbps, with a sensitivity of −11 dBm (BER = 10−12), has been simulated in STMicroelectronics (STM) 65 nm low-power CMOS technology

Analog front-end for a 3 Gb/s POF receiver

A plastic optical fiber cable includes: a bare plastic optical fiber including a core formed of a polymer containing a methyl methacrylate unit, and a clad layer including a layer formed of a specific fluorine-containing olefin resin at least in the outermost layer; and a coating layer around the bare plastic optical fiber, the coating layer including a light-shielding coating layer formed of a specific nylon resin composition, a functional coating layer (C) and a functional coating layer (D) in this order, where one of the functional coating layer (C) and the functional coating layer (D) is formed of a resin composition (I) containing a polybutylene terephthalate resin as a major component or an ethylene-vinyl alcohol copolymer as a major component; the other is formed of a specific nylon resin composition (II); and a ratio of the thickness of the functional coating layer (C) to the thickness of the functional coating layer (D) is set to fall within a specific range.

Plastic optical fiber cable and method of transmitting signal

A method of forming a filter element is disclosed comprising introducing a mixture into a feeder, the mixture comprising a plurality of susceptor particles and a plurality of polymeric binder particles. The mixture is advanced through the feeder and into a die comprising an excitation portion where eddy currents are induced in the susceptor particles by subjecting the mixture to a high-frequency electromagnetic field, the eddy currents being sufficient to elevate the temperature of the susceptor particles to cause adjacent polymeric binder particles to be heated to at least a softening point. The susceptor particles bind with the heated polymeric binder particles in the die to form a coherent mass. The coherent mass is advanced out of the die and cooled to form the filter element.

Method of forming filter elements

PROBLEM TO BE SOLVED: To provide an optical fiber capable of high-speed communication which has excellent transparency and flexibility and in which a monomer for a core section contains trichloroethyl methacrylate as a main component.SOLUTION: An optical fiber comprises a core section and a cladding section arranged on the outer circumference of the core section. The core section comprises, as a main component, a polymer made of monomers which contain not less than 70 wt.% of trichloroethyl methacrylate(TCEMA), and the cladding section comprises, as a main component, a polymer made of monomers which contain not less than 20 wt.% of methyl methacrylate(MMA). Another optical fiber comprises a core section and a cladding section arranged on the outer circumference of the core section. The core section comprises, as a main component, a polymer made of monomers which contain not less than 70 wt.% of TCEMA, and the outer circumference of the cladding section is covered with a plastic which contains a polycarbonate as a main component.

Optical fiber and method for manufacturing the same

The invention provides an extrusion material supply device suitable for use in melt extrusion molding, and a method for manufacturing an optical transmission body, in which a deterioration of an optical signal transmission loss is extremely small, and productivity intrinsic to an extrusion molding method is provided in combination. An extrusion material supply device 1 includes: a vertical hopper 2, which has a cooling unit 3 and a heat melting unit 4 continuous with a lower portion thereof, and houses a material rod R; cooling means 5 for cooling the cooling unit 3; an electric heater 6 that heats the heat melting unit 4; and gas pressurizing means 7 for sequentially supplying molten plastics M to a metal die by a gas pressure. The heat melting unit 4 is formed into a cylinder shape in which an inner diameter is larger than an inner diameter of the cooling unit 3 arranged above, and enables the molten plastics M to spread in the heat melting unit 4. A portion between an outer circumference of the material rod R and an outer circumference of the molten plastics M is defined as an annular gas pressurizing surface 7a.

Extrusion raw material feeding device and method of producing optical transmission body by using extrusion raw material feeding device

PROBLEM TO BE SOLVED: To provide a resin molding machine using induction heating which can secure uniform heating as well as contribute to reduction of energy cost, especially in induction heating to a thermoplastic synthetic resin. SOLUTION: A thermoplastic synthetic resin material is used as a raw material G. The resin molding machine is constituted so that a molten state of the raw material G by applying induction heating treatment, is injected into a predetermined mold M or directly extruded outside via a die. The resin molding machine is equipped with: a cylinder 20 in which the raw material G is charged; a screw 32 in an isolated state from the cylinder 20, which is concentrically mounted to interior of the cylinder 20 and rotates around an axial center to be driven by a driving means to forward the raw material G; and a high frequency generator 50 which applies high frequency to the raw material G in the cylinder 20 by the screw 32 as a counter electrode, which is a member of the cylinder 20 and a screw member 30. COPYRIGHT: (C)2009,JPO&INPIT

Resin molding machine and extrusion molding method

A GI type optical fiber of the present invention is a GI type optical fiber having a core component and a cladding component disposed around the outer periphery of the core component, the core component includes a polymer containing at least 55 wt % chlorostyrene monomer and a dopant, and the cladding component includes a polymer of a monomer containing at least 35 wt % methyl methacrylate. It is an object of the present invention to provide a GI type optical fiber in which chlorostyrene is used as the predominant component of the monomer that constitutes the core component, and therefore has excellent transparency and good flexibility, and allows high-speed communication.

Gi-type optical fiber and method for manufacturing same

Disclosed is an optical fiber wherein a monomer for a core portion contains trichloroethyl methacrylate as a main component, said trichloroethyl methacrylate being excellently transparent and very flexible. The optical fiber enables high-speed communication. Specifically disclosed is an optical fiber composed of a core portion and a cladding portion arranged around the core portion, wherein the core portion is mainly composed of a polymer of a monomer that contains not less than 70% by weight of trichloroethyl methacrylate (TCEMA) and the cladding portion is mainly composed of a polymer of a monomer that contains not less than 20% by weight of methyl methacrylate (MMA). Also specifically disclosed is an optical fiber composed of a core portion and a cladding portion arranged around the core portion, wherein the core portion is mainly composed of a polymer of a monomer that contains not less than 70% by weight of TCEMA and the outer circumference of the cladding portion is covered with a plastic that contains a polycarbonate as a main component.

Tazuru Okamoto

Papers

Optical fiber and method for manufacturing the same

Extrusion raw material feeding device and method of producing optical transmission body by using extrusion raw material feeding device

Resin molding machine and extrusion molding method

Gi-type optical fiber and method for manufacturing same

Optical fiber and method for producing same