Abstract: An optical module includes a receptacle for receiving an optical connector attached to a distal end of an optical fiber, and a lens body having a contact surface coming into contact with the distal end of the optical fiber when the receptacle receives the optical connector. The lens body has the contact surface and an opposing surface opposing the contact surface, and further has a columnar base held by the receptacle, a lens portion formed on the opposing surface integrally with the base, and a flat portion. The lens portion is surrounded by the flat portion and is off-centered with respect to the base.

Abstract: A preform having edges overlapped and jointed, two outer members for forming outer surfaces of a hydroformed product, and reinforcement members for forming reinforcement ribs that divide a hollow cross section of the hydroformed product, including a joint formed by, when more than three sheet materials for forming the outer members and the reinforcement members are overlapped together, welding a first sheet material on a surface of the overlapped sheet materials to a second sheet material positioned inside the first sheet material, and a space disposed and aligned with a joint plane between the second sheet material and a third sheet material located inside the second sheet material during the welding process.

Abstract: An optical module includes a lens-containing optically-transmissive member and a receptacle. The receptacle includes: an optical connector-inserting section; a fixing section for fixing the member; and an device-installing section for installing a semiconductor device serving as a light emitting device or a light receiving device. The fixing section communicates with the device-installing section. The member includes a main body and a lens. The main body includes a first section and a second section, the first section having a first outer diameter, which is substantially equal to a internal diameter of said fixing section, and said second section having a second outer diameter, which is smaller than the first outer diameter, and at least containing an end of said main body in a side of the device-installing section.

Abstract: A preform having edges overlapped and jointed, two outer members for forming outer surfaces of a hydroformed product, and reinforcement members for forming reinforcement ribs that divide a hollow cross section of the hydroformed product, including a joint formed by, when more than three sheet materials for forming the outer members and the reinforcement members are overlapped together, welding a first sheet material on a surface of the overlapped sheet materials to a second sheet material positioned inside the first sheet material, and a space disposed and aligned with a joint plane between the second sheet material and a third sheet material located inside the second sheet material during the welding process.

Abstract: A preform with edges overlapped and jointed each other and first and second outer members for forming outer surfaces of a hydroformed product, and reinforcement members that are jointed to the first and second outer members to form reinforcement ribs that divide a hollow cross section of the outer surfaces, the reinforcement members having dimensions capable of suppressing elongation in a tensile direction due to a tensile force that develops during hydroforming.

Abstract: A method of manufacturing an optical module according to an aspect of the present invention includes: preparing a stem including a first lead and a second lead to transmit an electrical signal from a photonic device, the second lead being shorter than the first lead; preparing a member having a first hole and a second hole which are formed therein so as to correspond to the first lead and the second lead, respectively; inserting the first lead into the first hole; and inserting the second lead into the second hole after inserting the first lead into the first hole.

Abstract: A preform with edges overlapped and jointed each other and first and second outer members for forming outer surfaces of a hydroformed product, and reinforcement members that are jointed to the first and second outer members to form reinforcement ribs that divide a hollow cross section of the outer surfaces, the reinforcement members having dimensions capable of suppressing elongation in a tensile direction due to a tensile force that develops during hydroforming.

Abstract: There is provided a semiconductor optical receiver module that performs efficient heat dissipation, without incurring an increase in cost. The semiconductor optical receiver module includes a substrate provided on a package, a semiconductor photodetector provided on the substrate, a chip capacitor provided on the substrate, and a preamp IC provided on the package, without the intermediation of the substrate.

Abstract: A preform with edges overlapped and jointed each other and first and second outer members for forming outer surfaces of a hydroformed product, and reinforcement members that are jointed to the first and second outer members to form reinforcement ribs that divide a hollow cross section of the outer surfaces, the reinforcement members having dimensions capable of suppressing elongation in a tensile direction due to a tensile force that develops during hydroforming.

Abstract: An optical module with flexible substrate that improves high-frequency characteristics. A flexible substrate 30 is formed with a top wiring layer 32 and a bottom wiring layer 34 formed on both surfaces of a polyimide layer 33, where the top wiring layer 32 has a plurality of wiring patterns 32a that electrically connect the leads 11 of the optical module 10 to the drive circuit of a circuit board 50, and the bottom wiring layer 34 is located on the entire surface of one side of the polyimide layer 33 so that it is electrically insulated from the wiring patterns 32a, is electrically connected to the ground of the circuit board 50, and is electrically connected to at least the leads 11 and, depending on its relationship with the wiring patterns 32a, to the stem 12 of the optical module 10 at a specified position of a stub region 34a having stub structure.

Abstract: An optical module with a CAN package contains a stem and a lead. The stem has a hole penetrating the stem and an inner cylindrical surface surrounding the hole. The lead extends through the hole such that a gap exists between the lead and the inner cylindrical surface. The gap contains first and second portions which are arranged along the longitudinal direction of the hole. The first portion is filled with sealing material which is dielectric. The second portion is filled with air.

Abstract: A flexible board capable of being bent easily and precisely a plurality of times at desired positions has insulating layer exhibiting flexibility, a conductor layer and recessed angular portions situated in both side edges of the board so as to oppose each other. Three of more of these angular portions are disposed on each side edge of the board. More specifically, the flexible board has at least one constricted portion that reduces the width of the board. The constricted portion is situated on both side edges of the board in such a manner that the constricted portions oppose each other, and has at least one of a step portion having a step-like shape and a cut-out portion having a V- or U-like shape. Three or more step-like portions and cut-out portions are situated together on each side edge the board.

Abstract: An optical module with a CAN package contains a stem and a lead. The stem has a hole penetrating the stem and an inner cylindrical surface surrounding the hole. The lead extends through the hole such that a gap exists between the lead and the inner cylindrical surface. The gap contains first and second portions which are arranged along the longitudinal direction of the hole. The first portion is filled with sealing material which is dielectric. The second portion is filled with air.

Abstract: An optical module with flexible substrate that improves high-frequency characteristics. A flexible substrate 30 is formed with a top wiring layer 32 and a bottom wiring layer 34 formed on both surfaces of a polyimide layer 33, where the top wiring layer 32 has a plurality of wiring patterns 32a that electrically connect the leads 11 of the optical module 10 to the drive circuit of a circuit board 50, and the bottom wiring layer 34 is located on the entire surface of one side of the polyimide layer 33 so that it is electrically insulated from the wiring patterns 32a, is electrically connected to the ground of the circuit board 50, and is electrically connected to at least the leads 11 and, depending on its relationship with the wiring patterns 32a, to the stem 12 of the optical module 10 at a specified position of a stub region 34a having stub structure.

Abstract: A preform having edges overlapped and jointed, two outer members for forming outer surfaces of a hydroformed product, and reinforcement members for forming reinforcement ribs that divide a hollow cross section of the hydroformed product, including a joint formed by, when more than three sheet materials for forming the outer members and the reinforcement members are overlapped together, welding a first sheet material on a surface of the overlapped sheet materials to a second sheet material positioned inside the first sheet material, and a space disposed and aligned with a joint plane between the second sheet material and a third sheet material located inside the second sheet material during the welding process.

Abstract: A preform with edges overlapped and jointed each other and first and second outer members for forming outer surfaces of a hydroformed product, and reinforcement members that are jointed to the first and second outer members to form reinforcement ribs that divide a hollow cross section of the outer surfaces, the reinforcement members having dimensions capable of suppressing elongation in a tensile direction due to a tensile force that develops during hydroforming.

Abstract: A graphite-free lubricating oil which comprises a base oil having dispersed therein 10 to 40% by weight of a carbohydrate and/or a derivative thereof whose particle size ranges from 10 to 150 .mu.m, 2 to 20% by weight of a film-boosting agent and 0.1 to 20% by weight of a dispersant. Moreover, the lubricating oil is free of black-colored substances such as graphite. Therefore, the oil permits the improvement of working surroundings and exhibits excellent properties such as formability through forging almost comparable to or even greater than that of the commercially available graphite-in-oil type lubricating oils. The lubricating oil can be used instead of the graphite-containing lubricating oils for warm forging, hot forging, rolling, tube-manufacturing, drawing and extrusion in place of the graphite-containing lubricating oils and ensures the improvement in the working surroundings and excellent lubricity.

Abstract: A forging die has an inner cylinder of a hard material which is composed of 8-40 vol. % of a metal phase including Ni and Mo as major components and the remaining amount of a ceramic phase including Mo.sub.2 NiB.sub.2 and/or (Mo, W).sub.2 NiB.sub.2, and an outer cylinder of metal, wherein the outer periphery of the inner cylinder is in a state of interference fit to the outer cylinder.

Abstract: In a CAD/CAM plotting system, graphic data relating to an object to be plotted is sequentially input in accordance with instruction of a CAD/CAM program so as to plot a desired shape of the object on a display screen. A schematic outline of the object is one-stroke-sketched on the display screen. The sketched outline of the object is processed in the pattern recongnition and data analysis. Thereafter, coordinate points of the processed outline corresponding to correct dimension values of the object are determined by inputting a minimum number of dimension values thereof. Finally, the processed outline is automatically corrected with the correct dimension values based upon the determined coordinate points.