Abstract: In a fuel injector magnetic core is inserted in the solenoid coil in the box. The fuel feeding passage is provided in the magnetic core. The movable valve body which moves up to the magnetic core magnetically is provided in the box. The valve body has a flow passage which communicates to the feeding passage. The valve body is forced to be pressed by the plate spring so as to be in contact with the valve box so as to close the fuel injection orifice. The check valve is provided on the fuel feeding passage. An air pressure of about 20 to 100 kPa generated in the crank chamber of the engine is applied to fuel in the box through the diaphragm. Fuel is introduced into the fuel injector without pressurization and confined by the check valve, and the fuel is pressurized using air which is not affected very much by the force due to acceleration. Fuel is fed stably even under severe operational conditions, the engine will not stall due to insufficient or excessive feeding of fuel.

Abstract: An alumina composition, an alumina molded article, prepared from the alumina composition, an alumina ceramic prepared by sintering the alumina molded article, and a process for producing the ceramic; the alumina composition comprising .alpha.-alumina particles having a ratio of the shortest diameter to the longest diameter of from 0.3 to 1; and a size distribution of not more than 5, as expressed in terms of a D.sub.90 /D.sub.10 ratio, wherein D.sub.10 and D.sub.90 represent a cumulative 10% diameter and a cumulative 90% diameter, respectively, of a cumulative distribution depicted from the small diameter side, or comprising .alpha.-alumina particles having a polyhedral shape; a D/H ratio of from 0.5 to 3.0, wherein D represents a maximum particle diameter parallel to a hexagonal lattice plane of a hexagonal close-packed lattice of .alpha.-alumina, and H represents a particle diameter perpendicular to the lattice plane; and a size distribution of not more than 5, as expressed in terms of a D.sub.90 /D.sub.

Abstract: An electronic equipment has a stick as a movable input device provided to be manually moved. The position of the stick is detected. In accordance with the detected position, the movement of the stick is restricted within a predetermined movable range so as to be moved a plurality of predetermined areas. The area in which the stick is located is detected. In accordance with the detected area, corresponding control data stored in a memory are read out, and the electronic equipment is controlled by the read out control data.

Abstract: A driving apparatus allows simple detection of the light writing characteristic of light writing means, such as a CRT, without detaching the light writing means from the liquid crystal light valve. A display apparatus uses such a photoconductive liquid crystal light valve. The driving apparatus applies a drive voltage signal from a drive voltage source across two electrodes of a photoconductive liquid crystal light valve having a liquid crystal layer, a photoconductive layer and the two electrodes arranged to sandwich the liquid crystal layer and photoconductive layer and allows a writing light to be incident upon the photoconductive layer by light writing means coupled to a writing side, and comprises detection means for detecting an impedance across the two electrodes.

Abstract: A control system for a plurality of vehicle safety devices has a feeder circuit and a check current supplying circuit. A plurality of actuating elements are arranged in the feeder circuit in parallel relation, and at the same time, they are arranged in the check current supplying circuit in serial relation. When a switching element is turned ON in accordance with a trigger signal coming from a collision judging circuit, an electric current flowing through the feeder circuit is caused to flow through the actuating elements in parallel. The check current flows to the actuating elements in series. The voltage generated between opposite ends of the serial circuit of the actuating elements in the check current supplying circuit is compared with a predetermined allowable range of voltage in a malfunction judging current, and when the voltage between the opposite ends is outside the predetermined allowable range of voltage, a malfunction detecting signal is outputted from the malfunction judging circuit.

Abstract: A switching boosting circuit including a clock oscillating circuit having a Schmitt trigger inverter, a boosted-voltage inducing circuit which is actuated in a switching-operation mode in response to the output clock of the clock oscillating circuit to induce a boosted voltage, a capacitor which is charged by the boosted voltage from the boosted-voltage inducing circuit to store energy to be supplied to a load, and a feedback path for feeding back current whose intensity corresponds to the load from the capacitor to the clock oscillating circuit. The feedback current acts such that the duty ratio of the switching operation is set to be smaller than a predetermined reference duty ratio, and the feedback path includes a Zener diode for reducing the boosted voltage below a predetermined value.

Abstract: A photoconductive type liquid crystal valve maintains good gradation contrast characteristics in a projection image irrespective of if and when a possible temperature change occurs. The photoconductive type liquid crystal light valve comprises a laminated body including a liquid crystal layer 15, a photoconductive layer 15, and a light shielding layer 17, and a pair of driving electrodes which sandwich the laminated body and form an image forming area. A pair of temperature detecting electrodes are provided at positions out of the image forming area to sandwich at least the light shielding layer and detect a change in impedance of the light shielding layer, thereby detecting a temperature change of the light valve.

Abstract: When an information signal is recorded by irradiating a laser beam onto an optical recording disc, a carriage error signal corresponding to a deviation of an irradiating position of a carriage in the disc radius direction and a disc error signal corresponding to the deviation in the radial direction of the disc are combined, thus obtaining a composite error signal for controlling the translation of the carriage.

Abstract: A tracking error signal generating device using a four-segment detector in which signals from diagonally opposed elements are combined and the two so combined signals are phase compared. According to the invention, either before or during the combining, the output signals of the segments have high level components removed so as to reduce offsetting due to a non-uniform beam illuminating the detector.

Abstract: An aluminum nitride powder obtained by firing and reacting a mixture of alumina and carbon in a nitrogen-containing atmosphere is disclosed, the aluminum nitride powder having an oxygen content of not more than 2.0% by weight, an iron content of not more than 20 ppm, a silicon content of not more than 100 ppm, and a titanium content of not more than 20 ppm and having has a tapped density of at least 1.0 g/cm.sup.3. An aluminum nitride powder containing from 0.01% to 10% by weight of a sintering aid is also disclosed, the aluminum nitride powder having an oleophilic surface and having a tapped density of at least 1.0 g/cm.sup.3. The aluminum nitride powder of the present invention has excellent moldability, has a high tapped density, is less in formation of coagulated particles, and has a sharp particle size distribution.

Abstract: In a furnace which allows a feed powder or granules in a stack of trays on a base plate to be reacted with a reactive gas, the improvement wherein each of the trays has a cutout or an opening providing a passage for the reactive gas or the produced gas both at the top of one side wall and in the bottom wall to the opposite side of the tray, the base plate having an opening through which the reactive gas is introduced or the produced gas is discharged.

Abstract: A method for producing .alpha.-form silicon nitride having a central particle diameter of 0.3 to 1.0 .mu.m (.alpha.-Si.sub.3 N.sub.4) of high-grade and fine powder for its sintered body excellent in heat-stability and mechanical strength which comprises heat-treating at 1,450.degree.-1,550.degree. C., in an atmosphere containing nitrogen, a mixture prepared by adding one of additives:(a) a mixture of at least one of Be, Sr, Ge, Sn, Ti, Hf and compounds thereof with 0.01-1 part by weight of silicon nitride powder having a BET specific surface area of 15 to 50 m.sup.2 /g and consisting substantially of the .alpha.-form crystal, and(b) a mixture of Zr and compounds thereof with 0-1 part by weight of silicon nitride powder having a BET specific surface area of 15 to 50 m.sup.2 /g and consisting substantially of the .alpha.-form crystal,in a total amount of 0.001-0.

Abstract: A method for producing a high-grade fine powder of .alpha.-form silicon nitride (.alpha.-Si.sub.3 N.sub.4) for use as sintered bodies excellent in heat-stability and mechanical strength which comprises heat-treating, in an atmosphere containing nitrogen, a mixture prepared by adding additive:a mixture of at least one of Mg, Ca, and compounds thereof with 0.01-1 part by weight of silicon nitride powder,in a total amount of 0.001-0.1 part by weight calculated in terms of elemental weight(s) of Mg or/and Ca, and 1 part or less by weight of silicon nitride powder, to 1 part by weight of silicon oxide powder and 0.4-4 parts by weight of carbon powder.

Abstract: When an abrasive having an oleophilic surface intended for use in magnetic recording media, said abrasive being obtained by subjecting an inorganic powder material having a Mohs hardness of 5 or above and an average particle size of 2 .mu.m or below to a wet contact treatment with an aqueous solution or an organic solvent solution containing a dispersing agent having an oleophilic group and drying the treated powder material, is used together with a magnetic powder material in the magnetic recording layer of a magnetic recording medium, the wear of the magnetic head can be prevented and the still characteristics of the recording medium is improved.

Abstract: A coil assembly comprises a plurality of conductive spiral pattern layers which are piled up via (an) insulating layer(s) on a wafer. The electrical connection between the spiral patterns is established by means of a conductive member, which is a portion of the upper spiral pattern layer, filled in a through-hole which is made in the insulating layer so that the spiral patterns are connected in series to develop a high voltage when the coil assembly is moved in a magnetic field.

Abstract: An MFB loudspeaker comprising a detector element mounted on a diaphragm on a specific position, i.e., a nodal line of a primary resonance mode thereof for generating a voltage proportional to a component indicative the vibratory characteristics of the diaphragm.

Abstract: A cylindrical diamond body is shaped to form a truncated conical portion. A conductive layer is deposited on the diamond body extending from the truncated end to the other end of the body. The conical portion of the body with the conductive layer being attached thereto is lapped to remove portions of the layer and the diamond body to form a pair of substantially flat surfaces extending from the truncated end toward the opposite end leaving the conductive layer to form a narrow width electrode for picking just one information signal stored in the form of minute pits along a spiral track or concentric tracks.