Mitsubishi Cable Industries, Ltd.

Sumitomo Electric Hardmetal Corp.

Nec Corporation

Minoru Yoshida

Kazuo Imamura

Katsuaki Kondo

Yasuhide Sudo

Yoshiji Sato

Shuhei Misumi

Shogo Ikunishi

Tatsuhiro Kawamura

Yutaka Kobayashi

Nozomi Tsukihara

Atsushi Toyohara

Takeru Nakashima

Tadashi Yamaguchi

Takashi Okuyama

Hideki Okuno

Tadahiko Nakai

Yoshiyuki Imada

A rotary cutting tool includes a main body and a shank. The main body has a tip end. The shank is continuous with the main body on the side opposite to the tip end. The main body is provided with a first cutting edge having a positive twist angle, and a second cutting edge having a negative twist angle and separated from the first cutting edge. Each of the first cutting edge and the second cutting edge extends continuously from the tip end to the shank.

Rotary cutting tool

A drill includes a body. The body includes a first cutting edge, and a second cutting edge apart from the first cutting edge to the back end side relative to the first cutting edge and formed in a recess traversing an outer peripheral portion of the body. In a side view of the body in a first direction in which a distance between a center axis of the body and a first outer end of the first cutting edge is seen the longest, a second outer end of the second cutting edge is located at the center axis side relative to the first outer end of the first cutting edge.

Drill

Drill bit

To provide a diamond compact die semi-manufactured product and a diamond compact die that do not crack during die processing. A diamond compact die semi-manufactured product includes a diamond compact and a holding ring. The holding ring is a cylinder composed of a tungsten alloy, and the inner diameter thereof is tapered. The diamond compact is tapered so as to fit to the taper of the cylinder and the diamond compact is press-fitted to the holding ring. For lower cost production, the tapered face of the diamond compact is formed by electric spark machining. The tungsten alloy contains 90% to 97% by weight of tungsten and 3% to 10% by weight of nickel.

Material for diamond sintered body die and diamond sintered body die

The fiber-wired sheet of the present invention includes a pair of sheets facing each other and a fiber arrangement sandwiched by the pair of sheets. The pair of sheets have respective adhesive layers on the surfaces facing the fiber arrangement. The fiber arrangement has a double-layer structure composed of a continuous fiber, and the layers are in contact with the respective adhesive layers.

Fiber-wired sheet and method for manufacturing the same

The present invention includes a sheet material, a first optical fiber, a second optical fiber optically coupled to the first optical fiber in portions thereof, and an optical fiber coupler constituted in the portions where the two optical fibers are coupled, and those of the first and second optical fibers, and the optical fiber coupler are integrally held in the sheet material.

Optical fiber holding structure

Optical fibers ( ) are routed over a substrate ( ), and an optical fiber wiring board ( ) is thereby constructed. A relative refraction index difference &Dgr; of the optical fiber ( ) is increased to be greater than a relative refraction index difference &Dgr; of a communication-dedicated single mode optical fiber, and a core diameter thereof is increased to be larger than a core diameter of the communication-dedicated optical fiber. Thereby, a mode field diameter thereof is set to be substantially the same as a mode field diameter of the communication-dedicated optical fiber.

Optical fiber and optical fiber wiring board using the optical fiber

A thin member for sealing and holding optical fibers laid two-dimensionally is composed of a base member layer, an adhesive member layer deposited on the base member layer, and a laminate member layer holding the optical fibers between it and the adhesive member layer. The optical fibers are arranged parallel not to be superposed on one another. They are bent individually by 180 degrees at the right-hand end of the thin member, bent downward toward the lower side of the thin member at the area from the central part to the left-hand side part, and led out of the thin member. Hence the structure is thin and therefore can be accommodated in a small space, enabling a small size. If the portions, led out of the thin member, of the optical fibers are covered with tubes, breakage of the optical fibers can be prevented. The thin member can be flexible.

Structure for holding optical fiber

An optical fiber board has a substrate , optical fibers arranged as wiring on the substrate , and extension portions in which the optical fibers are led out from the substrate. The optical fibers in the extension portions are covered with protective tubes for protecting the optical fibers. One end portion of each of the protective tubes is attached to corresponding ones of notch portions provided in an end edge portion of the substrate from which the optical fibers are extended out.

Optical fiber wiring board

An optical fiber board has a substrate, optical fiber arranged as wiring on the substrate, and extension portions in each of which some optical fibers are led out from the substrate to be adjacent to each other in a row. The adjacent optical fibers at a base portion of the extension portion are not fixed to one another. The adjacent optical fibers at a forward end portion of the extension portion are fixed to one another integrally. The base portion has a predetermined length from an edge portion of the substrate.

Optical fiber wiring board having an extension portion

A long period grating ( ) by which an excitation light propagated through the 2nd core ( ) of a double-core type optical fiber composed of the 2nd core ( ) formed on the outer circumference of the 1st core ( ) is guided into the 1st core ( ) is formed on the 1st core ( ) to improve an excitation efficiency.

Optical fiber

A structure for retaining an optical fiber, capable of not only handling a long optical fiber as one piece without causing the optical fiber as a whole to get loose but also reducing an area occupied by the optical fiber and retaining the same stably without causing micro-bending thereof to occur, wherein the optical fiber ( ) is arranged so as to form planarly staggered turning portions thereof without causing intersecting parts to occur, a plurality of similar planarly staggered turning portions of the optical fiber being laminated in the same position in the direction of the thickness thereof which is at right angles to a plane on which the optical fiber is arranged, the resultant optical fiber ( ) being generally retained in a sheet-like state by a fixing material ( ), such as a bonding agent and a film.

Growing community of inventors

Itami, Japan

Minoru Yoshida