Abstract: A four-stroke engine for a working machine with a rod is provided, where a tool is attached to one end of the rod in a longitudinal direction and the four-stroke engine is fixed to the other end of the rod in use. The four-stroke engine includes: an oil circulation pathway; and a gas-liquid separating chamber configured to separate oil from blowby gas. The gas-liquid separating chamber includes: an inflow part into which the blowby gas is introduced from the oil circulation pathway; oil discharge parts configured to flow the oil separated from the blowby gas back to the oil circulation pathway; and a blowby gas discharge part configured to discharge the blowby gas not containing oil mist from the gas-liquid separating chamber and supplies the blowby gas to an intake passageway to a combustion chamber.

Abstract: To peel an etching resist easily and reliably without damaging a transparent conductive layer coated with the etching resist. A method for manufacturing a transparent printed circuit in an embodiment of the present invention includes: providing a transparent conductive sheet 3 having a transparent base material 1 and a transparent conductive layer 2 formed on the transparent base material 1, forming an etching resist 4 having a specified pattern on the transparent conductive layer 2, etching the transparent conductive layer 2 with the etching resist 4 as a mask, forming a peeling film 5 on the etching resist 4 and on the transparent base material 1 exposed by etching of the transparent conductive layer 2 so as to cover an area where the etching resist 4 is formed, and peeling the peeling film 5 together with the etching resist 4.

Abstract: Provided is a transparent flexible printed wiring board which is excellent in flexibility, heat resistance and adhesion between a transparent film and a transparent conductive film. A transparent polyimide film, whose dimension change rate in association with a baking process is not larger than ±0.2%, is prepared. ITO ink containing ITO fine particles and a binder is printed in the form of a predetermined pattern on the transparent polyimide film by an ink-jet method. The ITO ink is then baked at 230 to 300° C., thereby forming a transparent conductive film with a binder ratio of 5 to 10 wt %.

Abstract: It is an object to form a conductive intermediate layer having a function of maximally preventing a solder leaching phenomenon with a low environment load and with good productivity. There are provided an insulative base material 2, a wiring circuit pattern 3 formed on at least one surface of the insulative base material 2, an electronic part mounting land 31 which is formed as part of the wiring circuit pattern 3 and on which an electronic part 7 is to be mounted, and a conductive intermediate layer 5 made of a sintered conductive ink film on the electronic part mounting land 31.

Abstract: Provided is a connector unit capable of surely positioning and cone ting a plurality of optical fiber plugs in a short time and easily releasing the connected state of the optical fiber connectors even if the quantity of the optical fiber connectors is increased. The connector unit (10) comprises a positioning member (12) for positioning a plurality of optical fiber plugs (11), an adapter (13) with plug guide hole parts (20) into which the tip ends of the optical fiber plugs (11) we inserted for connection with each other, and guide parts (14) for guiding the positioning member (12) relative to the adapter (13) and inserting the tip ends of the optical fiber plugs (11) into the plug guide hole parts (20) of the adapter (13) for connection with each other.

Abstract: A printed wiring board includes a plurality of conductor plates that includes at least one conductor plate that is used as a lead for electrical connection with an external circuit, the conductor plates being separated spatially from one another; an insulating layer formed on or across the conductor plates or both on and across the conductor plates; and a plurality of wiring patterns formed on the insulating layer. At least one of the conductor plates is electrically connected with at least one of the wiring patterns through a via-hole.

Abstract: A material producing method includes: generating singlet oxygen by irradiating light to an oxygen molecule that has penetrated into a material or that is near a surface of the material; and producing a desired material by breaking a bond in a molecular structure in the material with the generated singlet oxygen to cause a polymerization reaction or a substitution reaction to change a molecular weight of the material.

Abstract: A magnetic element having an excellent direct-current saturation characteristic by effectively utilizing a size of a core is provided. The magnetic element has cores 11, 7, 8 and 17 formed of a magnetic material, buried conductor parts 21, 31 and 41 in the magnetic material, and a plurality of branch conductor parts 22, 23, 34, 35, 36, 37, 42 and 43 branching from the buried conductor parts 21, 31 and 41 to be a plurality of parts and separately turning around the magnetic material.

Abstract: A method for manufacturing optical fibers with filter, wherein a multilayer-film filter is formed at end face of the optical fibers, comprising a process for fixing each of the optical fibers on a fixing jig, a process for polishing the end face of the optical fiber fixed on said fixing jig, a process for film-forming a filter on the end face of the optical fibers after polishing, and a process for taking out said optical fibers from said fixing jigs, respectively, wherein said process for film-forming the filter is performed by forming a fiber bundle in which a plural number of optical fibers after polishing, on which the filter has been film-formed, are tied such that all polished planes are aligned at the end face.

Abstract: An optical component provided with a waveguide groove having, an waveguide holding plane having a surface shape extending along a specified axial direction and capable of holding at least one optical waveguide while positioning it at at least a part of at least one side face thereof; and an opening extending substantially oppositely to the waveguide holding plane and being smaller in width than the outside diameter of at least one optical waveguide in a specified widthwise direction perpendicular to the specified axial direction.

Abstract: A printed wiring board includes a plurality of conductor plates that includes at least one conductor plate that is used as a lead for electrical connection with an external circuit, the conductor plates being separated spatially from one another; an insulating layer formed on or across the conductor plates or both on and across the conductor plates; and a plurality of wiring patterns formed on the insulating layer. At least one of the conductor plates is electrically connected with at least one of the wiring patterns through a via-hole.

Abstract: A printed wiring board includes a plurality of conductor plates that includes at least one conductor plate that is used as a lead for electrical connection with an external circuit, the conductor plates being separated spatially from one another; an insulating layer formed on or across the conductor plates or both on and across the conductor plates; and a plurality of wiring patterns formed on the insulating layer. At least one of the conductor plates is electrically connected with at least one of the wiring patterns through a via-hole.

Abstract: An optical component is disclosed, which comprises a waveguide groove, having: a waveguide holding plane having a surface shape extending along a specific axial direction and capable of holding at least one optical waveguide while positioning it at at least a part of at least one side face thereof; and an opening portion extending substantially oppositely to the waveguide holding plane and being smaller in width than the outside diameter of at least the one optical waveguide in a specified widthwise direction perpendicular to the specified axial direction.

Abstract: A magnetic element having an excellent direct-current saturation characteristic by effectively utilizing a size of a core is provided. The magnetic element has cores 11, 7, 8 and 17 formed of a magnetic material, buried conductor parts 21, 31 and 41 in the magnetic material, and a plurality of branch conductor parts 22, 23, 34, 35, 36, 37, 42 and 43 branching from the buried conductor parts 21, 31 and 41 to be a plurality of parts and separately turning around the magnetic material.

Abstract: A printed wiring board includes a plurality of conductor plates that includes at least one conductor plate that is used as a lead for electrical connection with an external circuit, the conductor plates being separated spatially from one another; an insulating layer formed on or across the conductor plates or both on and across the conductor plates; and a plurality of wiring patterns formed on the insulating layer. At least one of the conductor plates is electrically connected with at least one of the wiring patterns through a via-hole.

Abstract: An optical element mounted body is disclosed. The optical element mounted body comprising: an optical semiconductor element having a light-emitting/light-receiving portion and a predetermined structure formed on a primary surface thereof; and a substrate having a mounting surface; wherein said substrate has a first hollow formed on said mounting surface, and wherein said optical semiconductor element is mounted junction-down on said substrate such that said structure of said optical semiconductor element and said first hollow of said substrate face each other.

Abstract: An optical fiber module lead frame has a plurality of lead terminals. One of the plurality of lead terminals functions as a lead terminal for inputting transmit signals for feeding electricity to a light emitting device from outside. One of the other lead terminals functions as a lead terminal for outputting received signals for sending electrical signals outputted from a photodetector to outside. An electric field between the lead terminal for inputting transmit signals and the lead terminal for outputting received signals is one source of crosstalk from the light emitting device side to the photodetector side. Then, provided is the configuration of suppressing the electric field between the lead terminal for inputting transmit signals and the lead terminal for outputting received signals.

Abstract: A small-sized and low-cost silicon platform for optical modules which enables high-speed transmission. A conductor pattern is formed on an oxide layer formed on the surface of a silicon substrate through a dielectric film. A hole extending from the surface of the dielectric film to the oxide layer is formed in the dielectric film at a position for the formation of a bonding pad. A conductor material is directly formed on the oxide layer exposed to the bottom of this hole. This conductor material constitutes a bonding pad portion electrically connected to the conductor pattern.

Abstract: A small-sized and low-cost silicon platform for optical modules which enables high-speed transmission. A conductor pattern is formed on an oxide layer formed on the surface of a silicon substrate through a dielectric film. A hole extending from the surface of the dielectric film to the oxide layer is formed in the dielectric film at a position for the formation of a bonding pad. A conductor material is directly formed on the oxide layer exposed to the bottom of this hole. This conductor material constitutes a bonding pad portion electrically connected to the conductor pattern.

Abstract: A photodiode array device having an absorption layer and a cladding layer formed on one surface of a single substrate, anodes formed on the cladding layer, a cathode formed on the other surface of the substrate, and a plurality of light-receiving regions; a photodiode module including the photodiode array device; and a structure for connecting the photodiode module and an optical connector. The photodiode array device has trenches formed on the one surface of the substrate and having such a depth as to divide the absorption layer into subdivisions, for cutting off propagation of light between adjacent light-receiving regions.