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

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 present invention comprises: a plurality of collimating lenses (2a - 2e) that are arranged in a one-to-one relationship with a plurality of laser light sources (1a - 1e) which exhibit anisotropy in a laser light emission angle, and that convert laser light beams emitted from the laser light sources into parallel light; a condensing lens (4) that condenses the laser light that has been converted into parallel light by the plurality of collimating lenses; and an optical fiber (5) having a square waveguide core (SC) which has a square shape, the fiber receiving and synthesizing the laser light condensed by the condensing lens. A longitudinal axis of a condensed beam condensed by the condensing lens is aligned with a diagonal axis of the square waveguide core.

Light-synthesizing laser device

PROBLEM TO BE SOLVED: To provide a novel-structured fiber with an added rare earth element, and highly efficient fiber laser and fiber amplifier configured by using the fiber.SOLUTION: A fiber includes: a core glass of a high refractive index at a center part thereof, which is formed of SiO-based glass containing a rare earth element; a cladding of a low refractive index arranged around the outer periphery of the core glass, which is formed of SiO-based glass not containing the rare earth element; an air gap covering a large portion of the outer periphery of the cladding; SiOglass with added fluorine (F) arranged around the outer periphery of the air gap such that the SiOglass with added F covers the cladding while being in contact with the outer periphery of the cladding on at least three points; and SiO-based glass without added F arranged around the outer periphery of the SiOglass with added F.

Fiber with added rare earth element, fiber laser and fiber type amplifier using the same

PROBLEM TO BE SOLVED: To provide a method for manufacturing a metallic pipe lined with an olefin resin by which an olefin resin is applied to the inner face of a metallic pipe for lining with an extremely wide operating range, using a general-purpose olefin resin, without defining a special blend and limiting an operating range, in lieu of an olefin resin whose shape memory is poor. SOLUTION: This method for manufacturing a metallic pipe lined with an olefin resin comprises the first step to mold a double-layered plain pipe for lining with an adhesive resin applied to the outer face of an olefin resin pipe, the second step to insert the double-layered plain pipe for lining into the metallic pipe after folding the plain pipe, the third step to bring the plain pipe into contact tightly with the inner face of the metallic pipe by applying a pressure to the inner face of the plain pipe after inserting the double-layered plain pipe into the metallic pipe and the fourth step to heat the outer face of the metallic pipe at higher than a melting point of the adhesive resin and at lower than a melting point of the olefin resin pipe under such a state that the plain pipe is brought into contact tightly with the inner face of the metallic pipe and thereafter, bond the inner face of the metallic pipe and the outer face of the plain pipe together by cooling the entire plain pipe down to lower than its melting point. COPYRIGHT: (C)2003,JPO

Method for manufacturing metallic pipe lined with olefin resin

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

PROBLEM TO BE SOLVED: To relax molecular or crystal orientation, to eliminate the heat shrinkage of a molded article and to shorten a molding cycle, by setting the temp. of a mold cavity to the melting temp. of a resin or higher at the time of filling with the molten resin, and holding the mold cavity to the melting temp. of the resin or higher for a while to cool the temp. of the molded article to the normal temp. SOLUTION: A mold heated to the m.p. of a resin or higher is filled with a molten resin to suppress the growth of a skin layer and a fine crystal layer. Next, the temp. of the mold is held to the m.p. of the resin or higher for a while to accelerate the relaxation of the orientation generated by the flow of the resin. A molded article is cooled in the mold until the temp. thereof becomes the normal temp. The mold is held to a heated state by providing an electric heater 11 in the mold l to pass current through the heater. The mold is cooled by supplying cooling water with a temp. of 25 deg.C to the cooling medium flow pipes 12, 13 of the mold 1 by a mold temp. controller 2 through a pipeline 21 equipped with a solenoid valve 22 or supplying cooling water with a temp. of 5 deg.C or lower to the cooling medium flow pipes 12, 13 by a mold temp. controller 3 through a pipeline 31 equipped with a solenoid valve 32.

Injection molding method and cylindrical injection- molded article

PROBLEM TO BE SOLVED: To provide a manufacturing method of a polyvinyl chloride resin based optical transmission body which can be formed optimal in refractivity distribution with improved productivity. SOLUTION: This manufacturing method includes a step of heat treating a polyvinyl chloride-based resin optical transmission body of a coaxial bilayer structure composed of an inner layer made of a polyvinyl chloride resin and one or more sorts of transparent and diffusible additives higher than this resin in refractivity with a Tg of 60-110°C, and an outer layer made of a polyvinyl chloride resin and one or more sorts of transparent and diffusible additives lower than this resin in refractivity with a Tg of 80-130°C and whose Tg is higher by 20°C than that of the inner layer to diffuse the above additive to the outer or center areas of the optical transmission body, and forming an area continuously changing its refractivity. COPYRIGHT: (C)2008,JPO&INPIT

博次吉田

Papers

Optical fiber and method for manufacturing the same

Method for manufacturing metallic pipe lined with olefin resin

Resin molding machine and extrusion molding method

Injection molding method and cylindrical injection- molded article

Method for manufacturing polyvinyl chloride resin based optical transmission body

博次 吉田

Papers

Optical fiber and method for manufacturing the same

Method for manufacturing metallic pipe lined with olefin resin

Resin molding machine and extrusion molding method

Injection molding method and cylindrical injection- molded article

Method for manufacturing polyvinyl chloride resin based optical transmission body

博次吉田