Abstract: A modular clutch includes a flywheel 2, a clutch cover assembly 3 and a clutch disk assembly 4, which form a single module that in one embodiment is installed directly onto the crankshaft of an engine, and in an alternate embodiment is attached to a flex plate. The modular clutch is configured to be installed and replaced as a unit. The clutch cover assembly 3 has a clutch cover 21, a pressure plate 22 and diaphragm spring 23. The clutch disk assembly 4 has a clutch engagement portion 31 made of a metallic sintered body.

Abstract: A modular clutch includes a flywheel 2, a clutch cover assembly 3 and a clutch disk assembly 4, which form a single module that in one embodiment is installed directly onto the crankshaft of an engine, and in an alternate embodiment is attached to a flex plate. The modular clutch is configured to be installed and replaced as a unit. The clutch cover assembly 3 has a clutch cover 21, a pressure plate 22 and diaphragm spring 23. The clutch disk assembly 4 has a clutch engagement portion 31 made of a metallic sintered body.

Abstract: An elastic member made of, for instance, a rubber material, is fixed to a piston member of a lockup clutch. A wet friction facing is fixed to the elastic member. The elastic member provides a cushioning effect when the lockup clutch is engaged for controlled slippage.

Abstract: A cylindrical member of a sensor mounting member is partitioned in its middle by a partitioning wall into a high pressure side and a low pressure side, with pressure sensors provided at the two surfaces of the partitioning wall. At a base portion of the sensor mounting member, a communicating hole constituting a portion of a flow passage of a piping joint connector is formed. The sensor mounting member structured as described above is fitted in a communicating hole that communicates between a high pressure passage and a low pressure passage bored at the side of the piping joint connector.

Abstract: The present invention proposes an optical wavelength division multiplexer device which has low through loss and low reflection loss, and also has high isolation. A filter member is made up from a filter base board upon which is formed a wavelength division filter 5, and is disposed so as to intersect an input and output optical waveguide 3 of rectilinear form part-way along it at an intersection angle .alpha.. When light which includes light of two different wavelengths .lambda..sub.1 and .lambda..sub.2 is incident through an incident light side of the input and output optical waveguide 3, the light of wavelength .lambda..sub.2 passes through the wavelength division filter 5 and is emitted through an emitted light side, while the light of wavelength .lambda..sub.1 is reflected by the wavelength division filter 5 in a direction separated from the input and output optical waveguide 3.

Abstract: An optical waveguide component includes at least one main waveguide through which signal light and regenerating light propagate and a branch waveguide branching from the main waveguide, which are formed on the same substrate; a filter element disposed at a branch portion of these waveguides; and a plurality of reflecting elements having two reflecting faces, which are arranged in the extending direction of the branch waveguide. In the optical waveguide component, one reflecting face of the two reflecting faces is a face for reflecting the regenerating light to the filter element, and the other face is a face for reflecting the regenerating light to the direction deviating from the light axis direction of the branch waveguide, or the intervals between the reflecting elements are different from each other. This optical waveguide component enables the time-series signal processing of regenerating light to be performed accurately.

Abstract: A composite optical device has a first and second chips. The first chip has a substrate on which M pieces of optical waveguides for transmitting communication light, N pieces of optical waveguides for transmitting monitoring light and M-input/N-output star couplers are formed in an integrated form, and the second chip has a substrate on which N pieces of optical waveguides for transmitting communication light, N pieces of optical waveguides for transmitting monitoring light and N pieces of 2-input/2-output star couplers are formed in an integrated form. A first and second blocks holding optical fibers are joined respectively to the first and second chips. When the composite optical device in which the first and second blocks and the first and second chips are joined is incorporated into the optical communication system, a passive double star system is constructed. By using an MT connector instead of the first block and the first chip, a single star system can be rapidly constructed.

Abstract: An optical fiber end portion (10) which has a ferrule (11) which comprises a butting end face (11e) opposed to or butted against an optical device (20), and a single fiber hole or a plurality of fiber holes formed in parallel at predetermined intervals, into which one end of optical fiber (13a) is inserted, the optical fiber being optically connected to said optical device, a method for manufacturing the optical fiber end portion, and a construction for connecting the end portion to the optical device. The ferrule is formed of a molded product of synthetic resin, and is provided with at least one connecting member (12) on the side of butting end face connected to the optical device. The connecting member (12) has a linear expansion coefficient set at a value smaller than the linear expansion coefficient of a synthetic resin forming the ferrule.

Abstract: The present invention provides a method of manufacturing an optical component, having the steps of forming a first position aligning pattern on a surface of a substrate, forming a second position aligning recess-projection pattern conforming with the first position aligning pattern and a third position aligning recess-projection pattern having a predetermined positional relationship with the second position aligning recess-projection pattern, and applying a predetermined processing with the third position aligning recess-projection pattern used as a reference under a predetermined positional relationship with the first position aligning pattern.

Abstract: A waveguide type optical component, as an optical coupler/splitter, is provided, which is capable of reducing the dependence of the efficiency of optical coupling between optical waveguides on wavelength and of permitting reduction in size. The optical component has a first optical coupling section (A) including optical waveguides (A1, A2) sharing the same propagation constant, a second optical coupling section (B) including optical waveguides (B1, B2) having different propagation constants, and a third optical coupling section (A') including optical waveguides (A'1, A'2) sharing the same propagation constant. Associated ones of the optical waveguides (A1, B1, A'1; A2, B2, A'2) are connected in series with each other.

Abstract: An optical waveguide component which has end faces to be connected with optical fiber connectors by means of guide pins, comprises an optical waveguide component body having an optical waveguide core portion, and a resin mold cladding portion covering all the faces of the optical waveguide component body except for the end faces of the optical waveguide component body. Each end face of the resin mold portion has guide pin holes which were formed with the optical waveguide core portion being used as a positioning reference. Since the guide pin holes for connection with the optical fiber connectors are formed in the resin mold portion which, preferably has some elasticity and which covers the optical waveguide component body, the guide pin holes and a substrate are not broken even if subjected to a load after connection.

Abstract: An optical line monitoring method and an apparatus for locating a failure point in an optical communication system, wherein a plurality of types of inspection light rays having wavelengths which are determined by cut-off wavelengths, which differ from each other, of short-wavelength pass filters installed at a plurality of branched ports of an optical coupler/splitter of the communication system are sent from a light source having variable wavelengths into one or more corresponding optical fiber lines of the system in sequence via an optical directional coupler and the optical coupler/splitter. Each time reflected light, corresponding to the inspection light, from one or more optical fiber lines is received, an output representing the intensity level of the reflected light is sent from a light receiver to an arithmetic circuit and stored in the arithmetic circuit.

Abstract: An optical connecting device including an optical waveguide substrate having a plurality of optical waveguides, at least two fiber arranging members connected to at least one connecting end surface of the optical waveguide substrate, and an optical fiber disposed in the position controlling means of the fiber arranging members, wherein the connecting end surfaces of the optical wave guides and the optical fiber are brought in contact with each other, thereby the optical waveguides and the optical fiber are optically connected to each other.

Abstract: A method of connecting waveguides and optical fibers includes the steps of forming the waveguides and a marker at the same time on a waveguide substrate when patterning the waveguides by a photolithography method, forming a clad layer on a region other than another region when the marker is formed so as to embed the waveguides, and forming a fitting pin groove at a position corresponding to a position of the marker. By using this fitting pin groove, a waveguide module and an optical fiber connector are connected so as to connect each of the waveguides and each of the optical fibers with each other. With this method, waveguides and optical fibers can be aligned and connected with each other easily and in a short period of time without employing an expensive aligning device.

Abstract: Thiophene derivatives represented by the general formula (I): ##STR1## where R is an aldehyde, carboxyl, C.sub.1-5 -alkyl ester or C.sub.1-5 -alkyl acetal group and n is 3 to 5, are prepared. These compounds are reversibly converted to their respective isomers by light irradiation, accompanied with a large shift of absorption and emission bands, thus suitable for a photo-responsive material.

Abstract: By the selective use of a homogeneous stable precursor solution in which no polymerization reactions immediately occur and which contains aromatic compounds such as pyrrole, thiophene, aromatic amines or their derivatives, oxidizing agents, and solvents, as a precursor solution of conductive polymer film, a homogeneous and tough conductive polymer film can be obtained when the said precursor solution is cast on a substrate and the solvents are evaporated to remove.

Abstract: A method of connecting an optical fiber to a planar optical waveguide is provided in which an end face of a waveguide chip in which planar optical waveguides are formed is abutted against an end face of a fiber aligning jig on which optical fibers are arranged, to thereby connect the optical fiber to the corresponding planar optical waveguide. At least one marker is formed in each of the waveguide chip and the fiber aligning jig, and also at least one pin guide groove is formed in each of the waveguide chip and the fiber aligning jig, using the marker as a reference mark. The markers of the waveguide chip and the fiber aligning jig are aligned with each other along optical axes of the planar optical waveguides when the waveguide chip and the fiber aligning jig are abutted against each other. Further, fiber guide grooves are formed in the fiber aligning jig, using the marker as a reference mark.

Abstract: Thiophene derivatives represented by the general formula (I): ##STR1## where R is an aldehyde, carboxyl, C.sub.1-5 -alkyl ester or C.sub.1-5 -alkyl acetal group and n is 3 to 5, are prepared. These compounds are reversibly converted to their respective isomers by light irradiation, accompanied with a large shift of absorption and emission bands, thus suitable for a photo-responsive material.

Abstract: An optical coupler/splitter having an optical waveguide on the side of light incidence, two optical waveguides on the branched side, branched from the former optical waveguide and each having straight and curved sections, and a dielectric multi-layer film filter provided in a manner crossing the latter waveguides and common to them. The filter is so formed as to intersect with a straight section of one waveguide and with a curved section of the other, so that respective crossing angles between the filter and the branched optical waveguides differ from each other, thereby providing different reflection or transmission characteristics with respect to the branched optical waveguides. An optical signal having a variable wavelength and issued from a measuring apparatus based on the backscattering method is distinguished by the common filter of the coupler/splitter, making it possible to perform measurement of the losses of the branched optical waveguides independently without being affected by interference light.

Abstract: A 2-input/2-output directional coupler is arranged as an element coupler/splitter for a first stage, and 1-input/2-output coupler/splitters are used as element coupler/splitters for a second stage and subsequent stages. Output ports of these element coupler/splitters are concatenated with input ports of other element coupler/splitters to form a 2-input/multi-output coupler/splitter. An optical signal can be inputted through one input port of the first-stage 2-input/2-output directional coupler, and an optical signal for optical line monitoring can be inputted through the other input port. It is unnecessary, therefore, to use an optical wavelength division multiplexer/demultiplexer or other optical part which conventionally is connected at the time of optical line monitoring.