Abstract: A thermosensitive hydraulic fan coupler for an automobile engine, which allows a suitable amount of air to be supplied to the engine in accordance with the travelling condition of the automobile through the rotation of a fan is provided. The fan coupling according to the present invention is provided with an idle oil chamber and a specific dam within the former adjacent the oil circulation passage between the oil chamber and the torque transmission chamber with the dam serving as an opening and closing mechanism so that in addition to the effects of preventing the generation of abnormal fan noises and promoting an warming-up operation of the engine, it can more effectively prevent the phenomenon of "attendant rotation" of the driven side of the coupling immediately after restarting the engine.

Abstract: A fluidized fan coupling device is provided to substantially eliminate accompanying rotation followed engine start up. The device includes a sealed housing with a partition plate dividing the interior of the housing into a torque transfer chamber and an oil reservoir. The housing is rotatably mounted to a shaft which extends into the torque transfer chamber. A driving disk is mounted to the shaft and is disposed in the torque transfer chamber. An oil outflow regulating hole extends through the partition plate and is provided with a valve that responds to changes in temperature. The partition plate also has an oil circulating aperture to permit flow of oil from the torque transfer chamber to the oil reservoir only when the engine is stopped. An idle oil groove in the outer periphery of the torque transfer chamber communicates with an oil circulation passage which extends from the idle oil groove to the oil reservoir. A dam is provided in the idle oil groove to urge the oil through the oil circulation passage.

Abstract: A temperature-sensing fan fluid coupling for use with an automobile engine. The coupling comprises a sealed enclosure, a partition plate having an outflow control hole, a thermostat mounted upon the front surface of the enclosure, a rodlike link member in contact with the thermostat at its one end, an interlocking member against which the link member bears, and a resilient tonguelike valve member. One end of the valve member is fixed, while the other end is in resilient contact with the front end of the interlocking member. The thermostat is connected to the valve member via the link member and the interlocking member. As the ambient temperature changes, the thermostat deforms to cause the valve member to more or less open the hole.

Abstract: A fan fluid coupling for controlling the rotational speed of a fan that cools an automobile engine. The coupling comprises an enclosed housing, a partition plate that divides the inside of the housing into an oil reservoir chamber and a torque transmission chamber, a driving disk, a dam, a passage extending from the torque transmission chamber to the oil reservoir chamber, a bimetallic strip, a valve member, an idle oil reservoir chamber, and a circular hole formed in the driving disk for placing the idle oil reservoir chamber in communication with the torque transmission chamber only when the associated engine is at rest. At least one small hole is formed in the wall defining the idle oil reservoir chamber, and this hole is in communication with the torque transmission chamber.

Abstract: A temperature-sensitive fan-coupling apparatus is provided with a driving side and a driven side. The driving side comprises a tightly sealed housing. The driven side comprises a rotary member from which fan blades extend. The rotary member includes a following disc disposed in the housing with a torque transmission gap existing between the following disc and the housing. A partition plate is mounted to the rotary member to define an oil reservoir therebetween. An aperture extends through the partition plate to provide communication between the oil reservoir and the torque transmission gap. A temperature-sensitive member is mounted external to the driven end of the apparatus and to one end of a connecting rod which extends through the rotary member and into the oil reservoir.

Abstract: A valve member of a temperature sensitive fluid fan coupling for an engine cooling fan is formed from a plate material having a weight provided at its free end. The modulus of section of the longitudinally central portion of the plate material is reduced to impart flexibility thereto so that it is flexible in the direction of rotation. Accordingly, it is possible to enhance the effect of the action of the weight which causes the valve member to be displaced so as to cancel the pivotal displacement of the valve member caused by the displacement of a bimetal. Thus, it is possible to eliminate the discontinuity in the temperature sensitivity of the speed of rotation of the fan and hence lower the noise level, reduce the fuel consumption and minimize the change in temperature of cooling water.

Abstract: A stripe groove is formed on a semiconductor substrate and buried by lamination of multiple semiconductor layers, and a channel being lower than the substrate surface is formed outside the groove near at least one mirror edge, such that a laser diode with decreased astigmatism can be produced.

Abstract: A phased array semiconductor laser has two or more luminous stripes. The number, width or center to center spacing of stripes is made different between the center region and neighborhood of facets of the laser so that the laser may oscillate stably in the fundamental supermode with an optical output of 100 mW or more.

Abstract: An abnormality detecting device for detecting a breakage in wiring of a rotation sensor. When the rotating acceleration calculated based on signals from the rotation sensor is greater than a predetermined acceleration value and the rotating speed calculated based on signals from the rotation sensor is zero, a detection signal is put on a wire connected to the rotation sensor. A change in the level of the detection signal is checked for determining whether the rotation sensor is abnormal, i.e., whether there is a breakage in the rotation sensor.

Abstract: A semiconductor device and method of manufacturing the same. The device comprises a first n-type semiconductor layer and a second undoped semiconductor layer between which a hetero-junction is formed, and a third p-type embedded semiconductor layer, a gate metal formed without the exposure to air immediately after the third, second and first semiconductor layer are successively formed, and an external electrode connected with the third p-type embedded semiconductor layer, capable of controlling the carriers in the neighborhood of the hetero-junction. This semiconductor device greatly improves the controllability of the threshold voltage thereof, and provides the gate electrodes of good quality.

Abstract: Disclosed is a semiconductor laser wherein an interface layer is provided on an upper cladding layer formed on an active layer, the interface layer having a smaller Al mole ratio than that of the upper cladding layer, thereby preventing oxidation of the semiconductor surface which is exposed to the atmosphere, and thus improving the crystallizability of a semiconductor layer which is to be formed subsequently. By setting the refractive index of this semiconductor layer so as to be smaller than that of the upper cladding layer, light can be confined in the active layer at increased efficiency.

Abstract: A thermal response type fluid fan coupling device which is constituted by a sealed chamber which is divided into an oil accumulating chamber and a torque transmission chamber, and which accommodates a driving disc, by a separating plate having an oil flow adjusting hole, in which a dam is provided in a circulated passage connecting the torque transmission chamber and the oil accumulating chamber, and a valve member for opening and closing the flow adjusting hole in accordance with change in ambient temperature is provided so as to control torque transmission from the driving side to the follower side by changing the effective oil contact area in a gap for transmitting torque between the driving disc and the case and the cover, wherein an idle oil accumulating chamber which is connected to an oil introducing gap which is connected to the torque transmission chamber is provided at the position outer than the dam in the radial direction, and oil introducing means for connecing the oil accummulating chamber and t

Abstract: The present invention relates to phased-array semiconductor lasers having a radiation angle turnable by oscillating independently and stably between the fundamental supermode and the higher order supermode and switching the radiation angles by utilizing the property that their radiation angles are different.Optical switching and optical scanning, that have been difficult in the prior art, can be made more easily by use of a semiconductor laser having a turnable radiation angle.The objection of the present invention can be accomplished by disposing separate electrodes at the emission stripes and at the gap between the stripes in the phased-array semiconductor laser.Further, the present invention may be accomplished by dividing at least one stripe electrode in order to form electrode regions. When the current is applied to all the electrodes, oscillation occurs in the highest order mode and the beam is emitted in another direction.

Abstract: A p-GaAlAs cladding layer is exposed to the air if a groove of the form of a stripe is formed by chemical etching in an n-GaAs layer that serves as a current confinement layer on the p-GaAlAs cladding layer, the groove being so formed as to reach the cladding layer. The GaAlAs is oxidized so easily that an unstable degradation layer is formed on the surface thereof. To solve this problem according to the prior art, an undoped GaAs layer that serves as a cover layer is formed on the p-GaAlAs cladding layer, the n-GaAs layer is formed, and the etching is effected so that the undoped GaAs layer is simply exposed. The undoped GaAs layer is then heated in the MBE apparatus while being irradiated with the As molecular beam and is thermally etched. Therefore, the cladding layer is exposed in vacuum and the p-GaAlAs layer is formed thereon. However, this method is not suited for mass-production since the thermal etching is unstable and it needs the MBE apparatus of a very high degree of vacuum.

Abstract: A semiconductor laser device having a stripe-shaped active region defined between a pair of end surfaces, at least one of the end surfaces having a curved cross-section in a plane parallel to the active region with a radius of curvature from 10 to 300 .mu.m, the stripe of the active region having such a width that a single transverse mode and a multi-longitudinal mode are allowed. The laser beam emitted from this laser can have little astigmatism and small spot size.

Abstract: A semiconductor laser which has a super lattice layer between a substrate and a light confinement layer, and in which a portion of the super lattice layer other than a portion corresponding to the radiation region of an active layer is disordered to block the electric current. The disordering is effected in a self-aligned manner to simplify the manufacturing process. Therefore, and element which oscillates and maintains a fundamental transverse mode is obtained with a good yield.

Abstract: A semiconductor laser device comprises a semiconductor layer stack consisting of a first clad layer, an active layer, and a second clad layer which are successively stacked on a semiconductor substrate, and a light absorbing layer and a current blocking layer which are stacked on the second clad layer; the semiconductor assembly including a stripe shaped groove which extends from the surface of the semiconductor layer stack to the surface or interior of the second cladding layer, and another semiconductor layer having a forbidden band width greater than the active layer and the same conductivity type as the second clad layer which is embedded into the groove by chemical vapor deposition method.

Abstract: A semiconductor device is provided comprising a control electrode for forming carriers at a junction interface between first and second layers of different materials and for controlling the carriers, a first electrode which is electronically connected to the carriers, and a second electrode region for taking out the carriers in a direction perpendicular to the junction interface. Since the two-dimensional carriers are caused to flow as a current in the direction perpendicular to a plane on which the carriers exist, a great current can be derived as an operating current.

Abstract: Herein disclosed is a semiconductor device in which control means for carriers migrating in a first semiconductor includes an interface state layer lying on the first semiconductor and a second conductor layer lying on the interface state layer. The interface state layer has its Fermi level pinned to that of the second semiconductor layer. By thus constructing an FET or the semiconductor device, an inversion or accumulation layer can be easily formed in the interface merely by applying a voltage to the control means.

Abstract: An optical semiconductor device includes a light emitting element disposed on a silicon sub-mount having a light receiving element formed in a surface region. By virtue of integral arrangement of the light emitting element and the light receiving element, a single lens can be used for both optical transmission and optical reception, whereby an optical communication system can be manufactured very inexpensively. Further, transmission and reception can be carried out simultaneously.