Abstract: A BGA type semiconductor device includes a base member 1, a land portion 2 formed on the base member 1, and a plurality of protrusions 4 formed on the land portion 2 by plating. Through the protrusions 4, the land portion 2 is connected to a solder ball 6. Each of the land portion 2 and the protrusions 4 has a surface coated with a metal plating layer 5.

Abstract: A semiconductor memory device, in which the output is restored to high impedance state and capable of operating always normally even when a prohibited command is input thereto, is disclosed. The device has a common terminal for data input and output, and data are output in synchronism with a clock. The device further comprises an output clock generating circuit for generating a clock in accordance with the output period of the output data, and an output circuit for producing the output data in accordance with the clock. The output clock generating circuit is turned off after generating an additional two cycles of the clock following the end of the production of the output data.

Abstract: A semiconductor memory device includes a memory cell connected to a bit line and a word line, a bit line precharge circuit which precharges the bit line to a ground voltage, and a word decoder which sets the word line to a negative voltage when the word line is not selected.

Abstract: A variable delay circuit includes a first gate having a first delay amount, and a second gate having a second delay amount greater than the first delay amount. A difference between the first delay amount and the second delay time is less than the first delay amount.

Abstract: A semiconductor memory device includes at least one cell block including an array of memory cells, a plurality of sense amplifiers which temporarily hold data of the memory cells, a first data bus connected to the plurality of sense amplifiers via first gates, and a second data bus having a direct electrical connection to the first data bus and being laid out to extend through a position of the at least one cell block.

Abstract: A structure of a magnetostrictive shaft applicable to a magnetostriction-type torque sensor and a method for manufacturing the same can achieve a high torque sensitivity. A shaft parent material is made of a non-magnetic austenitic series metallic material (YHD50) and a magnetic thin film is made of a magnetostriction material such as Iron-Aluminium series alloy plasma spray coated on the whole outer peripheral surface of the shaft parent material. In a second embodiment, a mechanical working is carried out for the shaft material on the surface of which the magnetostriction material thin film is coated, the worked shaft material is heated under an inert gas atmosphere, and the heated shaft material is immersed into oil under the inert gas atmosphere to perform the oil quenching.

Abstract: A structure of a magnetostrictive shaft applicable to a magnetostriction-type torque sensor and a method for manufacturing the same can achieve a high torque sensitivity. A shaft parent material is made of a non-magnetic austenitic series metallic material (YHD50) and a magnetic thin film is made of a magnetostriction material such as Iron-Aluminum series alloy plasma spray coated on the whole outer peripheral surface of the shaft parent material. In a second embodiment, a mechanical working is carried out for the shaft material on the surface of which the magnetostriction material thin film is coated, the worked shaft material is heated under an inert gas atmosphere, and the heated shaft material is immersed into oil under the inert gas atmosphere to perform oil quenching.

Abstract: In a method for manufacturing a magnetostrictive shaft applicable to a magnetostrictive torque sensor and a product of the magnetostrictive shaft manufactured by the above-described method, a magnetostrictive shaft manufactured by the above-described method, a magnetostrictive shaft is made of an Fe--Al alloy having an aluminum content ranging from 13 wt % to 16 wt %. A shaft material constituted by the magnetostrictive shaft is mechanically worked and heated for a predetermined time duration up to a predetermined temperature and being oil quenched under an Argon gas temperature.

Abstract: A structure of a magnetostrictive torque sensor is disclosed in which an outer casing; a magnetostrictive shaft supported rotatably by the outer casing via a bearing member and having at least one magnetic anisotropy portion formed thereon; and a resin casing which is installed within the outer casing so as to enclose an outer peripheral end of the magnetostrictive shaft, said resin casing integrating at least pairs of core members, coil-wound bobbins, and excitation and detection coils wound on the coil-wound bobbins by means of a resin molding. In the structure described above, a positional deviation of such the coil bobbins, core members, and so on with respect to the magnetostrictive shaft is prevented by means of a plurality of elastic spacer members or such coil bobbin positioning members. Thus, the positional deviations of the core members and coils in an axial direction of the shaft do not occur.

Abstract: A detection and processing circuitry of a magnetostriction type torque sensor is disclosed. An alternating current voltage signal Vo is generated and output from an oscillator. A shift circuit shifts a phase of the AC voltage waveform of the oscillator by 1/4 period and outputs the phase shifted voltage to a detector. The detector modulates the inverted voltage signal Va on the basis of the phase shifted voltage signal and an integrator integrates the detector output voltage in a time range from (.alpha.-.pi./2) to (.alpha.-3.pi./2). Thus, the output voltage signal Vd from the integrator indicates a resistance value of an imaginary part, i.e., inductance of the impedance of the detection coil of a magnetostrictive shaft of the torque sensor which is not dependent on the change in a temperature.

Abstract: A fuel concentration monitoring unit includes a fuel temperature dependent error correction circuit in the unit. A fuel concentration indicative voltage signal variation rate set with taking a specific fuel concentration as reference point. The output incorporated in the unit.

Abstract: A connector apparatus comprising male and female connector members and a stay for mounting the connector members in place. A pair of oblong projections are formed on the terminal block portion at the rear end of each connector member so as to be located on opposite sides of the lead wire outlet section of the terminal block portion. The stay is provided with a pair of first elastic hook pieces engageable with the pair of oblong projections of the male connector member and a pair of second elastic hook pieces engageable with the pair of oblong projections of the female connector member. The first and second elastic hook pieces are arranged to face each other with a space therebetween measuring approximately equal to the distance between the terminal block portions of the two connector members when the connector members are completely assembled to maintain the members in assembled condition.

Abstract: A connector apparatus for electrical wiring with male and female connector members and a stay for mounting the connector members on a base, such as a vehicle. The connector members are provided with mating male and female projections, one of which has an engagement opening for receiving a locking pawl on the stay when the connector members are completely and properly assembled. The engagement opening is partially blocked if the connector members are not completely and properly assembled and the pawl is tapered to force such assembly upon installation of the connector members on the stay.

Abstract: In an electrical connector, a male connector body and a female connector body are coupled and locked together to effect the mechanical connection of electrical terminals housed in the respective connector bodies. To prevent incomplete coupling of the relevant connector bodies, a path is formed in the male connector body in such a manner as to correspond to the shape and dimension of a bracket for fixing the electrical connector to the body of an automotive vehicle or components thereof, and a rib is provided on the female connector body in such a manner as to traverse the path. This rib blocks a part of the path when the two connector bodies are improperly coupled with each other, thus making it possible to detect incomplete coupling. An electrical connector of another type has another configuration for the same purpose.