Abstract: An optical semiconductor device and optical semiconductor integrated circuit are provided by combining, on a semiconductor substrate, materials having different refractive indices and different temperature dependence of the refractive indices. In particular, it becomes possible to control the temperature dependence of the oscillation wavelength with a propagating region having a material and/or structure whose temperature dependence of the refractive index is different from that of a gain region of the semiconductor laser. In addition, they can be configured to have a plurality of interfaces formed along the waveguide direction of the optical waveguide so that the light reflected off the first interface is weakened by the light reflected from the remaining interfaces. Also, they can be configured with the interfaces inclined to the propagating direction so that the waveguide loss due to the reflection and refraction between the optical waveguides whose refractive indices differ from each other can be reduced.

Abstract: A light-controlled light modulator can achieve high-speed, low-loss wavelength conversion. Continuous light with a wavelength ?j is launched into an MMI coupler via a port, and is split into two parts by the MMI coupler, which are led to a loop-type interferometer. In the loop-type interferometer, the two parts travel separately around the loop as clockwise traveling light and counterclockwise traveling light, are combined by the MMI coupler again via a filter-equipped phase modulator, thereby being emitted to the port. In this state, signal light ?i(s) with a wavelength ?i is launched into the filter-equipped phase modulator via a port. Even when the wavelength ?i of the signal light ?i(s) is equal to the wavelength ?j of the wavelength converted output light, the wavelength conversion can be achieved with preventing noise from being mixed into the output light emitted from a port.

Abstract: A pressure sensor has a sensing unit and a pressure transmitting rod housed in a case, and a pressure receiving diaphragm. The case has a sensing unit housing portion and a pipe portion that extends from the sensing unit housing portion in a form of a pipe. The pipe portion includes an inner pipe and an outer pipe. The inner pipe is arranged inside the outer pipe and fixed to the outer pipe. The pipe portion has the first end located adjacent to the sensing unit and the second end away from the sensing unit. The inner pipe is projected from the outer pipe at the second end of the pipe portion. The pressure receiving diaphragm is welded to the inner pipe at the second end of the pipe portion such that it covers an opening of the inner pipe. The pressure transmitting rod is arranged inside the case such that its first end and second end are located on the sensing unit side and the pressure receiving diaphragm side, respectively.

Abstract: A light-controlled light modulator can achieve high-speed, low-loss wavelength conversion. Continuous light with a wavelength &lgr;j is launched into an MMI coupler via a port, and is split into two parts by the MMI coupler, which are led to a loop-type interferometer. In the loop-type interferometer, the two parts travel separately around the loop as clockwise traveling light and counterclockwise traveling light, are combined by the MMI coupler again via a filter-equipped phase modulator, thereby being emitted to the port. In this state, signal light &lgr;i(s) with a wavelength &lgr;i is launched into the filter-equipped phase modulator via a port. Even when the wavelength &lgr;i of the signal light &lgr;i(s) is equal to the wavelength &lgr;j of the wavelength converted output light, the wavelength conversion can be achieved with preventing noise from being mixed into the output light emitted from a port.

Abstract: A light-controlled light modulator can achieve high-speed, low-loss wavelength conversion. Continuous light with a wavelength &lgr;j is launched into an MMI coupler via a port, and is split into two parts by the MMI coupler, which are led to a loop-type interferometer. In the loop-type interferometer, the two parts travel separately around the loop as clockwise traveling light and counterclockwise traveling light, are combined by the MMI coupler again via a filter-equipped phase modulator, thereby being emitted to the port. In this state, signal light &lgr;i(s) with a wavelength &lgr;i is launched into the filter-equipped phase modulator via a port. Even when the wavelength &lgr;i of the signal light &lgr;i(s) is equal to the wavelength &lgr;j of the wavelength converted output light, the wavelength conversion can be achieved with preventing noise from being mixed into the output light emitted from a port.

Abstract: An annular groove portion is integrally formed for preventing splashing of the lubricating oil by extending from a mount base (10) of the motor rotor to the motor shaft (6) to the metal bearing (5) and the radial ball bearing (20), allowing a spacer member (15) making contact with an inner ring (20a) of the radial ball bearing (20) to be attached inside the annular groove portion.

Abstract: An optical amplifier includes a first optical path, second optical path, semiconductor optical amplifier, and multi-mode interference 3-dB coupler. The first optical path guides oscillation light. The second optical path guides signal light. The semiconductor optical amplifier causes oscillation on the first optical path. The multi-mode interference 3-dB coupler crosses the first and optical paths in the gain medium of the semiconductor optical amplifier.

Abstract: A notification method of operation information of an apparatus, comprising adding at least one information of information on a user of an object apparatus, information of an operation procedure of the object apparatus concerning a problem having occurred in the object apparatus, information of an operation history of the object apparatus, information in which an operation condition of the object apparatus is set, and information of an existing image of the object apparatus to message information indicating a content of transmission information, and transmitting the at least one information to a terminal apparatus of a pre-designated transmission destination from a terminal apparatus of a transmitter via a communication line.

Abstract: A light-controlled light modulator can achieve high-speed, low-loss wavelength conversion. Continuous light with a wavelength &lgr;j is launched into an MMI coupler via a port, and is split into two parts by the MMI coupler, which are led to a loop-type interferometer. In the loop-type interferometer, the two parts travel separately around the loop as clockwise traveling light and counterclockwise traveling light, are combined by the MMI coupler again via a filter-equipped phase modulator, thereby being emitted to the port. In this state, signal light &lgr;i(s) with a wavelength &lgr;i is launched into the filter-equipped phase modulator via a port. Even when the wavelength &lgr;i of the signal light &lgr;i(s) is equal to the wavelength &lgr;j of the wavelength converted output light, the wavelength conversion can be achieved with preventing noise from being mixed into the output light emitted from a port.

Abstract: A first cavity portion (103) for molding a first inner peripheral surface which is molded continuously from an opening of a bearing hole portion is provided in a first mold block (101). In a second mold block (102), a cavity C having an outside diameter (d2) greater than an inside diameter (d1) of the first peripheral surface and formed by the first cavity portion (103) and a second cavity portion at the time of mold closing is coaxially positioned, and a plurality of shape portions (104) for forming stepped portions are provided in such a manner as to extend toward the first mold block. A predetermined resin material in a molten state is introduced into the cavity to effect molding.

Abstract: An annular groove portion is integrally formed for preventing splashing of the lubricating oil by extending from a mount base (10) of the motor rotor to the motor shaft (6) to the metal bearing (5) and the radial ball bearing (20), allowing a spacer member (15) making contact with an inner ring (20a) of the radial ball bearing (20) to be attached inside the annular groove portion.

Abstract: A mechanism prevents uneven take-up of a tape on a take-up reel. This mechanism includes a roller guide having a first flange for guiding a first edge of the tape so as to position the tape in a direction perpendicular to a transport direction of the tape, and an arm roller which pushes against a part in a vicinity of a second edge of the tape which is taken up on the take-up reel, where the second edge is opposite to the first edge.

Abstract: A grating optical switch has at least one switch region for ON-OFF switch control of a signal light transmission and a signal light reflection, at least one input/output optical waveguide region for guiding the signal light to the switch, at least one coupler region for coupling the control light colinearly to the signal light and for guiding the control light to the switch region together with the signal light, and at least one separator region for separating the signal light and the control light. The switch region transmits the signal light when the control light is coupled while reflecting the signal light when the control light is not coupled.

Abstract: A magneto-optical storage medium and overwrite system comprises a first magnetic layer (reading/writing layer) (3), a second magnetic layer (auxiliary layer) (5) and a third magnetic layer (initializing layer) (7), each of which is a rare earth-transition metal alloy, and interface layers (4,6) for isolating magnetic exchange interaction between the magnetic layers, respectively. The second magnetic layer is initialized by the magnetization of the third magnetic layer (7) at room temperature. The first magnetic layer and/or the second magnetic layer is heated by a laser beam (P1) for demagnetization and remagnetization. The demagnetized portion of the second magnetic layer is remagnetized to the opposite direction by the demagnetizing field from the periphery. The demagnetized portion of the first magnetic layer is remagnetized to the same direction of the second magnetic layer.

Abstract: A turn signal cancelling apparatus for a vehicle having a handlebar and a blinker unit which is operable to be activated by a manual operation and is operable to be deactivated by a cancelling signal.

Abstract: A tin-lead alloy for recording media, which consists essentially of from 30 to 70% by weight of tin and the rest being lead.

Abstract: A turn signal cancelling apparatus for a vehicle having a handlebar and a blinker unit which is operable to be activated by a manual operation and is operable to be deactivated by a cancelling signal.

Abstract: A circuit arrangement for automatically switching off the turn signal of a vehicle, e.g., a motorcycle. The turning angle of the handlebar of the motorcycle is detected electrically, i.e., it is neglected when the vehicle travels at a lower speed, and the maximum swing of the handlebar is memorized. In returning the handlebar to the center position, when the turning angle differs from the maximum swing by a predetermined value, a turn signal cancelling signal is produced, which is also used to reset the circuit so that the circuit responds correctly when the turn signal action is repeated successively.

Abstract: There is disclosed herein a turn signal system for vehicles wherein the turn signal is automatically cancelled upon the steering device of the vehicle being returned to a predetermined position. The system is particularly applicable to motorcycles. The system includes a sensor which generates a signal representing a steering angle corresponding to the operation of the steering device, a noise eliminating circuit which receives the sensor signal and eliminates noises included in this signal as a function of running speed of the vehicle. A peak hold circuit receives the output signal from the noise eliminating circuit and holds the peak value of the signal, and a comparator receives the output signal of the noise eliminating circuit as well as the output of the peak hold circuit, and compares these signals to generate a turn-signal cancelling signal when the steering device has been returned by a predetermined amount toward its normal position.

Abstract: An electro-optic device for use in optical modulating systems and the like comprises a pair of optically transparent, multi-element interdigital electrodes which are sandwiched between a pair of electro-optic crystals, whereby symmetrical fringing fields having a predetermined periodicity widthwise of the device are coupled into the crystals when a voltage is applied to the electrodes, thereby creating substantially identical phase diffraction gratings in the crystals for sequentially diffracting an incident optical beam.