Abstract: The present invention provides: an oxidation reaction electrode that generates oxygen by oxidizing water; and a reduction reaction electrode that synthesizes a carbon compound by reducing carbon dioxide. The two electrodes are electrically connected. Also, the reduction reaction electrode (1) synthesizes a carbon compound by reducing carbon dioxide in a water-containing liquid using radiated light energy.

Abstract: An optical module is disclosed where the module includes an optical active device mounted on a carrier via a sub-mount, and a lens assembly mounted on the carrier and optically coupled with the device and an external fiber. A feature of the optical module is that the lens assembly has a metalized portion fixed to the carrier by the soldering.

Abstract: An optical subassembly (OSA) with a newly arranged optical device is disclosed. The OSA provides a ceramic package that installs a semiconductor optical device, a joint portion welded to a lid of the ceramic package, and an optical coupling portion that receives an external optical fiber. In the OSA, the seal ring put between the top of the multi-layered ceramic package and the lid is isolated from the optical device; accordingly, the lid, the joint portion and the optical coupling portion are electrically isolated from the semiconductor optical device even when the OSA is installed in an optical apparatus such as an optical transceiver.

Abstract: An optical module has disclosed, in which the optical module electrically isolates the optical device from the sleeve shell with a simple and a cost-effective arrangement. The optical receptacle includes the metal holder to hold the stub, the insulating bush to press-fit the holder, and the metal shell to press-fit the bush. The bush electrically isolates the holder from the shell, and has a length press-fitted to the shell overlapping with a length press-fitted to the holder.

Abstract: An optical module on the invention provides a multi-layered ceramic package in which the LD, the sub-mount to mount the LD, the optical component to bend the optical axis of the light emitted from the LD toward the lens, and the monitor PD to monitor a portion of the light transmitted through the optical component. These components are mounted on a metal in the package with an adhesive. At least one of the sub-mount and the optical component provides a chamfer in a front bottom corner thereof to provide a room to receive fillets formed in the surfaces facing to and abutting against the other surface.

Abstract: To provide a photocatalyst having high selectivity and carrying out a reductive reaction with light having a longer wavelength. A photocatalyst has a structure in which a semiconductor and a substrate are joined, in which the substrate causes a catalytic reaction by transfer to the substrate of excited electrons, which are generated by applying light to the semiconductor.

Abstract: The present invention relates to a microorganism which is capable of producing a polyhydroxyalkanoate (PHA) and satisfies the requirements: (1) expression of a phbA gene is repressed or a catalytic activity of an enzyme encoded by the gene is repressed; (2) expression of a bktB gene is enhanced or a catalytic activity of an enzyme encoded by the gene is increased; and (3) a polyhydroxyalkanoate synthase gene and a crotonyl-CoA reductase gene are introduced thereinto. Culture of this microorganism enables efficient production of P(3HB-co-3HH), which is a PHA having excellent flexibility and being applied to a variety of applications, with an inexpensive carbon source.

Abstract: The present invention provides an optical module with a relatively wider mounting area for the devices with a CAN package. The optical module of the present invention provides the stem and the cap, both of which form a cavity where the devices are to be installed. The stem provides the block extruding from the primary surface of the stem into the cavity. The block mounts the optical and electrical devices in surfaces opposite to each other, and provides feedthrough pins between these two surfaces. The device mounted in each surface may be electrically connected through these feedthrough pins.

Abstract: An optical module has disclosed, in which the optical module electrically isolates the optical device from the sleeve shell with a simple and a cost-effective arrangement. The optical receptacle includes the metal holder to hold the stub, the insulating bush to press-fit the holder, and the metal shell to press-fit the bush. The bush electrically isolates the holder from the shell, and has a length press-fitted to the shell overlapping with a length press-fitted to the holder.

Abstract: An optical sub-assembly (OSA) able to rigidly hold the sleeve and to isolate the frame ground from the signal ground is disclosed. The OSA provides the optical device and the sleeve assembly including the stub, the stub holder, the sleeve and the ring member. The stub holder is made of electrically conductive material and is electrically connected with the optical device. The ring member is made of electrically conductive material and is connected to the housing of the equipment in which the OSA is installed. The sleeve, which is made of insulating material, receives the stub holder in a portion thereof, and is press-fitted into the ring member in a second portion thereof. The frame ground of the housing is electrically isolated from the signal ground of the optical device by the insulating sleeve, and the first and second portions of the sleeve are overlapped along the longitudinal axis of the sleeve.

Abstract: A tuning-fork crystal wafer 1A which has legs 11, 12 with grooves 11c, 12c is shaped by etching of a crystal substrate 2. To improve processing precision of the depth of the grooves 11c, 12c, the width of the grooves 11c, 12c is set in advance, based on the etch stop technique in which the amount of etching depends on the pattern of an etch portion. Consequently, as far as the etch time satisfies a required minimum time, it is possible to obtain the depth as designed.

Abstract: The present invention provides an optical module with a new stem to reduce the EMI noise and to enhance the ESD tolerance of the optical transceiver. The optical module comprises the stem, a cap and a optical device installed in a space formed by the stem and the cap. The stem includes a center portion that mounts the optical device and a peripheral portion that holds the cap. Between the center portion and the peripheral portion is provided with an insulator to electrical isolate two portions. The case lead directly connected to the center portion and to the circuit board within the transceiver may be fully isolated from the frame ground connected to the sleeve and the peripheral portion.

Abstract: The present invention provides an optical module with a relatively wider mounting area for the devices with a CAN package. The optical module of the present invention provides the stem and the cap, both of which form a cavity where the devices are to be installed. The stem provides the block extruding from the primary surface of the stem into the cavity. The block mounts the optical and electrical devices in surfaces opposite to each other, and provides feedthrough pins between these two surfaces. The device mounted in each surface may be electrically connected through these feedthrough pins.

Abstract: The present invention provides an optical module with a new stem to reduce the EMI noise and to enhance the ESD tolerance of the optical transceiver. The optical module comprises the stem, a cap and a optical device installed in a space formed by the stem and the cap. The stem includes a center portion that mounts the optical device and a peripheral portion that holds the cap. Between the center portion and the peripheral portion is provided with an insulator to electrical isolate two portions. The case lead directly connected to the center portion and to the circuit board within the transceiver may be fully isolated from the frame ground connected to the sleeve and the peripheral portion.

Abstract: There is provided an optical module in which a process to form an optical coupling portion therein and to attach this portion to the end surface of a ferrule in an optical connector can be easily performed. Moreover, an area of the coupling portion coming in contact with the ferrule may be narrowed such that the cleaning of the area can be easily done in a short time. The optical module includes a sleeve assembly that comprises a cylindrical member and a sleeve member with a sleeve to guide the ferrule and a pocket in the deep end of the sleeve to receive the pocket. The sleeve has a bore with the first diameter, while, the pocket has another bore with the second diameter smaller than the first diameter. The cylindrical member comes into direct contact with the end surface of the ferrule. An entire portion of the cylindrical member is uniformly formed.

Abstract: The optical assembly of the present invention suppresses the reflection occurred at the end face of the external fiber, which makes it simple to control the pressure of the glass block with a simplified shape and easily processed at the fitting into the housing. The optical assembly includes the sleeve to guide the external fiber, the glass block to suppress the reflection at the end surface of the external fiber, and the housing to secure the sleeve and the glass block. The housing provides a wall to receive the pressure applied from the optical connector securing the external fiber to the glass block, and the wall is assembled in the housing such that the surface of the glass block becomes in substantially perpendicular to the inner wall of the sleeve.

Abstract: It is an object of the present invention to develop a novel vector. Preferably, the object is to develop a novel vector which can be stably retained in bacteria of the genus Ralstonia, Cupriavidus or Wautersia without any antibiotic-due selective pressure and has no transferability by conjugation. Another object is to provide a strain which can stably produce polyhydroxyalkanoate using the vector, and a method for producing a polyhydroxyalkanoate using the strain. The present invention provides a novel recombinant vector which contains an origin of DNA replication functioning in bacteria of the genus Ralstonia, Cupriavidus or Wautersia. Particularly, the transformant, which is obtained by using a recombinant vector which contains the origin of DNA replication functioning in bacteria of the genus Ralstonia, Cupriavidus or Wautersia and contains a region for a recombinant vector stabilization (par region) can make the vector to be stably retained in bacteria, and can efficiently produce a polyhydroxyalkanoate.

Abstract: An optical module is inserted into a cage containing a connector electrically connected to a conductive wiring on a host board. The cage, the connector and the conductive wiring is provided on the host board. The optical module includes a circuit board and a housing. The circuit board has a card edge connector at an edge thereof. The card edge connector mates with the connector on the host board. The housing has a conductive ceiling with a rear edge and builds the circuit board therein. The conductive ceiling has a stopper supported thereby and protrudes therefrom. The stopper extrudes from the edge of the circuit board and the rear edge of the conductive ceiling.

Abstract: An optical part 25, which is used to be placed at an end face of an optical fiber, is constituted by a single light-transmitting material transparent to light transmitted through the optical fiber, and comprises an optical fiber contacting face 30 disposed in contact with the end face of the optical fiber, and an light emitting face 33 tilted with respect to a cross section perpendicular to the axis of the optical fiber. Since the light emitting face 33 is formed with an inclination, such an optical part 25 restrains reflected light occurring at the optical fiber end face from going back to the optical fiber. Also, since the optical part 25 is constituted by a single light-transmitting material, its configuration is simple, and the length can be shortened in the optical axis direction.

Abstract: An optical module 10 comprises a substrate 11, a light-emitting module 14, a light-receiving module 19, and a housing. The substrate 11 has a front face and a rear face. The light-emitting module 14 and light-receiving module 19 are mounted to the substrate 11. The housing receives the substrate 11. The housing comprises an upper housing 12 and a lower housing 13. The upper housing 12 is disposed on the rear face side of the substrate 11 and in contact with the rear face. The lower housing 13 is disposed on the front face side of the substrate 11 and in contact with the front face. The substrate 11 is held between the upper housing 12 and lower housing 13.