Abstract: An induction heating apparatus comprising a static power converter operative to produce high-frequency power from low-frequency power and a heating unit to produce a time-varying magnetic field in response to the high-frequency power. The power converter includes a switching circuit and control means for triggering at high frequency during an incipient stage of operation of the apparatus and lower frequency varying according to the input power to the power converter and the load of the heating unit after the incipient stage.

Abstract: A convergence circuit for use in a color television image display system comprising a modulator receiving at one input a first signal at the line frequency of the deflection circuit and at another input a second signal at the field frequency of the deflection circuit, a quadrant separator for separating the modulated signal into four sections in accordance with the polarity of the modulated signal and the respective first and second half periods of the field scan to generate four control currents corresponding respectively to the corners of a rectangular raster. The control currents are supplied through respectively adjustment potentiometers to a convergence coil to permit independent convergence of scanned points in the corners of the screen.

Abstract: A light-emitting semiconductor device of the type having a substrate, a first layer of a semiconductor on the substrate and a second layer of a different conductivity on the first layer. The second layer is selectively voided so as to give a recess and leave the first layer uncovered in a region serving as the bottom of the recess. An ohmic electrode layer is selectively formed on the second layer so as to extend into the recess and contact with the uncovered region of the first layer, and another ohmic electrode layer is selectively formed on the second layer so as to be separated from the former electrode layer. A solder bump is built up on the first electrode layer to fill up the recess and another solder bump on the second electrode layer so as to be separated from the former solder bump.

Abstract: An oxygen sensor element comprising a substrate made of a compound oxide of the perovskite type and a pair of electrodes electrically connected to the substrate. The compound oxide has a formula ABO.sub.3 in which A represents an element of the lanthanum family, an alkaline earth metal or a mixture thereof and B is a transition metal.

Abstract: A scan converter is disclosed for use in a sector scan type ultrasound imaging system in which ultrasound echo signals return from targets along a plurality of radial scan lines distributed in a sector field with a substantially equal tangential angular increment with respect to a reference line. The scan converter comprises a sampling circuit which samples the echo signals at a speed inversely proportional to the cosine of the angle of deflection of the radial scan lines with respect to the reference line so that the sampled points align themselves in lateral lines perpendicular to the reference line. The sampled echo signals are converted into digital echo data and stored in a random access memory in the direction of its columns. The stored data are retrieved serially in the direction of the rows and fed into an interpolator for making interpolations between the successively retrieved echo data.

Abstract: In a conventional surface acoustic wave ring filter, a time-compensation element in the form of a thin strip is additionally provided for either retarding or accelerating one of the surface acoustic waves which transmit along different transmission lines, thereby the phases of two surface acoustic waves received by a single output converter included in the filter are matched with each other resulting in the improvement in the output signal characteristics.

Abstract: An ink ejection apparatus comprising an ink ejection unit having a liquid chamber connected to an ink container through a conduit and an air chamber connected to a source of pressurized air. Axially aligned discharge channels are provided to allow the ink in the liquid chamber to be discharged through the discharge channels. A piezoelectric transducer is mounted adjacent to the liquid chamber to generate rapid pressure increases therein to permit ejection of ink droplets to the atmosphere in response to electrical signals. The ink container is also supplied with the pressurized air from the air supply source so that there is a constant stream of air through the discharge channel and there is a static pressure balance between the air and liquid chambers when the air supply source is in operation.

Abstract: A level indicator comprising a plurality of comparators for comparing an analog signal with a respective value of graduated reference voltages generates one or more output signals in response to the analog signal exceeding each reference voltage. A plurality of storage circuits is provided each associated with a respective comparator and with a respective one of successively arranged luminous elements. Each storage circuit is responsive to the output of the associated comparator and delivers a signal for the associated luminous element, which signal may also be used to inhibit the passage of the outputs of the other storage circuits of descending order.

Abstract: An automatic power-driven screwdriver comprises a first cylindrical member having a hand grip portion, a guide portion, a tapered portion and a flanged portion between the tapered and hand grip portions. A second cylindrical member, which is a nose portion of the screwdriver, is mounted to telescope over the guide portion. A third cylindrical member encircles the guide portion and is slidably mounted at one end over the second cylindrical member. The third member is formed with a tapered contacting surface complementary to the surface of the tapered portion of the first member. An adjusting nut having an inwardly extending flange is mounted on the first member with the flange being in contact with the flanged portion and is threadably engaged with the third member so that the tapered contacting surfaces are brought into firm pressure contact which enables the first and second cylindrical members to be secured firmly together.

Abstract: Beam deflection delay time data of (L.times.M) data bits are stored in a read-only memory from which each datum is retrieved successively when the ultrasound beam is deflected to a given angle and repeatedly accumulated in a digital adder through a latching circuit connected between the output and input of the adder, where L is the number of discrete steps of deflection angle and M is a binary number representing the total delay time of piezoelectric transducers. The successively latched data is distributed to respective programmable counters for presetting the count values thereof to store therein respective delay time data. High frequency count pulses are supplied to the counters after the latter has been preset for delivery of carry outputs to the associated piezoelectric transducers.

Abstract: A phase-locked loop system for controlling the speed of a motor or the like comprises an oscillator generating clock pulses or the like comprises a programmable frequency divider receptive of clock pulses for delivery of output pulses at a frequency which is an integral submultiple of the clock frequency, the integral submultiple being variable as a function of external supplied digital signals. A phase comparator compares speed related pulses. A transducer generates pulses at a repetition frequency related to the speed of the motor which is compared in the phase comparator with the output pulse from the frequency divider for driving the motor. A programmable binary counter is provided which is reset in response to the beginning of each period of the speed related pulses for counting the clock pulse. A logic gate circuit is connected to the counter stages of the programmable counter to define a range of pulse counts to generate motor control voltage signals when the count falls outside of the defined range.

Abstract: A surface acoustic wave device comprising a piezoelectric substrate which comprises an .alpha.-alumina layer as a base region and a zinc oxide layer as a surface region formed on the .alpha.-alumina layer. Preferably the two layers are each made of a single crystal, and the thickness of the zinc oxide layer and an angle between a crystallographic axis of the zinc oxide single crystal and the direction of wave propagation are determined so as to fall within optimum ranges, respectively. This device features an increased phase velocity and an augmented value for the electromechanical coupling coefficient and accordingly is of use at very-high to ultra-high frequencies.

Abstract: The present invention relates to an improvement of a solar refrigeration system. The solar refrigeration system has been improved by combining a solar collector-generator and a heat exchanger into one unit to increase the performance efficiency of the system by eliminating heat losses. The solar collector-generator comprises a tube and header arrangement including a plurality of double-walled tubes, each consisting of an outer pipe and an inner pipe, the inner pipe defining a passage for a high temperature refrigerant-lean or weak solution, whereas, the outer and inner tubes defining therebetween a passage for a low temperature refrigerant-rich or strong solution.

Abstract: Two auxiliary heads are provided in addition to the two main heads for a helical scan video signal tape recorder. The vertical and horizontal positions of the auxiliary heads are determined so as to effectively reproduce a slow-motion picture from a magnetic tape on which the signals are recorded using the so called "azimuth" recording method. The output of each head is selectively supplied to a video signal demodulating circuit via a switching circuit.

Abstract: A solid electrolyte capacitor superior to a manganese dioxide capacitor and characterized by the use of an oxide of Ru, Rh, Re, Os or Ir either in place of or together with manganese dioxide. The newly utilized metal oxide is good at oxidizing ability and low in resistivity. A solid electrolyte layer comprising the newly utilized metal oxide is formed by pyrolysis of an aqueous solution comprising a soluble salt of the metal on an anodized valve metal. The solution may comprise manganese nitrate too.

Abstract: Novel organic heat-sensitive semiconductive materials containing tetracyanoquinodimethane (TCNQ) as electron acceptor and exhibiting inherent resistivity-temperature characteristics. The materials include (N-n-propylthiazolium).sup.+ (TCNQ).sup.- (TCNQ), (N-n-butylthiazolium).sup.+ (TCNQ).sup.- (TCNQ) and (N-n-butylpyridium).sup.+ (TCNQ).sup.- (TCNQ). These three compounds can be prepared by reacting TCNQ with iodides of corresponding cations, respectively. The heat-sensitive materials have particular utility in the field of timing or heat-sensitive elements.

Abstract: Two electron beams are used to scan a striped color phosphor pattern arranged normal to the scan line in succession so as to increase the total amount of photon emission during the interval between successive line scans. The two beams are oscillated parallel to the scan line so as to increase the dwell time of impinging electrons on the phosphor stripe with a consequential increment in brightness. Beam sensing elements are located in a predetermined positional relationship with the phosphor stripes. Impingement of the scanning beams upon the sensing elements produces an index signal representing the nonlinearity which may be present in the horizontal deflection waveform, which signal is stored for the interval of a subsequent raster scan and retrieved nondestructively at the start of each line scan. The retrieved signal is modulated in frequency with a signal representing the time it takes for the beam to traverse the entire phosphor stripes to compensate for the so-called pincushion distortion.

Abstract: In apparatus for inserting the connecting leads of circuit component parts which are successively arranged along a feeder tape with the leads extending from the tape in a same direction, a mounting bracket is provided which is manually rotatable about a vertical axis and on which are mounted a tape advancing mechanism and a cutter for cutting off the connecting leads of the component part which is brought to a cutting position. An insertion head extends coaxially with the vertical axis to provide reciprocating movement in response to the feeder advancing movement. A gripper is pivotally mounted at the lower end of the insertion head and operable to rotate during the downward movement of the insertion head from a horizontal position to hold the component part whose connecting leads are being cut off to a vertical position to orient the cutoff ends of the leads toward matching holes of a printed-circuit board.

Abstract: An electromagnetic valve comprises a magnetic circuit formed by a stationary core and a movable core, or armature pivoted at one end of the stationary core and rotatable continuously between first and second positions with a free end positioned in opposed relation to the other end of the stationary core with an air gap therebetween. The armature is spring biased so as to remain in the first position and carries a valve head for engagement with a valve seat. The opposing ends of the stationary and movable cores are so shaped as to form in the air gap a first working section in which the main magnetic flux generates a vector component transverse to the length of the armature and a second working section in which the main magnetic flux generates a vector component parallel to the length of the armature. The resulting vector makes the angular displacement of the armature linearly proportional to the supply current.

Abstract: The present invention provides a high voltage generating device utilizing a piezoelectric element. The device comprises an outer rotary member having a plurality of saw tooth-like cam lobes formed on its outer circumference equidistant from each other and an inner rotary member disposed in the outer rotary member. A cam follower for applying an impact to a piezoelectric element is biased toward the outer rotary member to cooperate with one of the cam lobes. The inner rotary member has a ball mounted therein and a spring for biasing the ball radially outwardly into operative engagement with an inner surface of the outer rotary member. The inner surface of the outer rotary member is so constructed and arranged as to permit free rotation of the inner rotary member unless the inner rotary member is depressed and turned in a predetermined direction.