Abstract: A plurality of switches each is provided in the vicinity of each of a plurality of heater coils of an induction heating apparatus, and responsive to removel of a cooking implement from a corresponding heater coil for being rendered open. A plurality of timers each is connected to each of the switches and causes the heater coil to be de-energized when the cooking implement is kept away from the heater coil for more than a predetermined time period.

Abstract: A connector assembly for a printed circuit board having electrical contacts on at least one surface of its edge portion, comprising a housing structure having spaced parallel side wall portions at least one of which has electrical contact elements carried on the inner face thereof, and at least one elastic retaining member partly positioned within the housing structure and in engagement with at least one of the side wall portions of the housing structure for being in pressing engagement with the printed circuit board and thereby holding the circuit board in a predetermined fixed position having the contacts in close contact with the contact elements on the housing structure.

Abstract: The present invention relates to automatically operative pumping equipment. A by-pass passage is installed branching off from the delivery pipe and meeting the vacuum pipe of a pump driven by an electric motor, the by-pass passage being equipped with pressure regulating means operable in response to the water pipe pressure at the pump delivery side, and by-pass passage regulating means controlled in response to a signal from a flow rate sensor on the pump delivery side, whereby the pressure on the pump delivery side is regulated by the by-pass regulating means and pressure regulating means thereby to automatically control pump operation in response to command signals from a pressure switch.

Abstract: A centrifugal separator comprises a follow rotor which is formed with a row of pores arranged circumferentially of the rotor and perforated, cylindrical film detachably received on the inner peripheral surface of the rotor. A mass of a semifluid material positioned within the film is splashed on to the inner surface of the film by a centrifugal force so that the liquid content of the material is passed through the film. The film is radially contracted by the liquid pressure developed between the film and the inner peripheral surface of the rotor and forms a cylindrical interstice between the film and the rotor, providing an additional filter medium through which the liquid is filtered and withdrawn from the pores. The rotor may be closed throughout its area and have a free longitudinal end from which to allow the liquid to withdraw. The centrifugal separator finds an application as a juice extractor if provided with a grating disc.

Abstract: A piezoelectric transducer is secured to the surface of a glass sheet to translate mechanical vibrations generated in the glass sheet into an electrical signal when a crack is produced. A detection circuit is connected to the transducer to determine whether the frequency of the signal is above or below a predetermined value. If the frequency is higher than the predetermined value, a warning signal is derived to indicate a crack and therefore probably a burglary. Alternatively, the piezoelectric transducer in the transmit mode is excited electrically by an impulse to introduce an elastic wave into the glass sheet. A gate circuit is connected to the transducer to pass signals resulting from reflection of the elastic wave from discontinuities in the glass sheet which result from a crack. The reflected crack indicating signals are passed through the gate to the transducer when it is in the receive mode.

Abstract: A centrifugal fluid exhausting device for use, by way of example, in a portable vacuum cleaner, comprising a centrifugal fan driven by an electric motor and housings enclosing the fan and the motor, characterized in that the paths of fluid between the fan and the fan housing and between the motor and the motor housing are streamlined to reduce the resistances to the flows of fluid therethrough.

Abstract: An ultrasonic probe particularly suitable for ultrasonic diagnostic equipments of the electronic scanning type is made up of a multiplicity of piezoelectric transducer elements, each in the shape of a rectangular plate with electrode films coated on both sides, arranged in a row at intervals and an acoustic impedance matching layer placed on the row of the transducer elements. The width-to-thickness ratio of each piezoelectric plate takes a value not greater than 0.8 and preferably between 0.4 and 0.7 so that the plate can vibrate in width expansion mode. It is highly preferable that the impedance matching layer has a laminated structure given by two layers which are different in acoustic impedance of the respective materials and individually have definite thicknesses.

Abstract: A color print painted with different colors C.sub.i (i = 1, 2 . . . n) is scanned by a color scanner along a plurality of successive line paths to generate a set of electrical signals each representing the intensity of the spectral components of the light reflected from an elemental area of the print. A macroscopic color separator is provided to generate a set of electrical signals each representing the average spectral intensities per unit area of the print. A data processor is used to compute the probability P(C.sub.i) from the data obtained from the macroscopic color separator and a set of mean spectral intensities exhibited by the color samples with which the print is painted by artisans. In accordance with the Bayes' Rule, the processor then executes computation of the product of P(C.sub.

Abstract: An ink ejection system of the invention includes an electrical circuit generating sinusoidal wave pulses and a liquid applying unit operable to discharge the liquid in pulsed jets in response to the sinusoidal wave pulses. The circuit comprises means for generating a sinusoidal signal of constant amplitude and frequency higher than the highest instantaneous frequency of a video signal, and means for modulating the amplitude of the sinusoidal signal in accordance with the video signal to generate a signal containing no harmonic components.

Abstract: An alloy represented by the general formula Ti.sub.x-y Zr.sub.y Cr.sub.2-z Mn.sub.z, where 1 .ltoreq. x .ltoreq. 1.3, 0 < y .ltoreq. 1, and 0 < z < 2. This alloy readily forms complex metal hydrides at low hydrogen pressures and can absorb a large quantity of hydrogen. The absorbed hydrogen can readily be liberated at room temperature.

Abstract: An induction heating apparatus includes a saturable reactor having a pair of rectangular ferrite cores. An air gap is provided in each ferrite core to provide a gradually increasing saturation characteristic on the magnetization curve of the cores. A pair of series-connected load windings is coiled around each core and a control winding is coiled around a common magnetic path of the cores. A power control circuit produces a DC control current that passes through the control winding. The high frequency energization current is passed through the load windings. Means are provided to control the DC control current at a desired setting. Preferably, the actual power level is detected to control the DC current through a feedback loop.

Abstract: A variable frequency oscillator comprises an oscillating loop and a variable phase shifter for imparting one of two different phase shifts depending upon the polarities of a DC control voltage to a signal from the oscillating loop. The phase-shifted signal has its amplitude controlled by the amplitude of the control voltage and is combined with the signal in the oscillating loop. The vector sum of the combined signals determines the phase angle of the oscillator signal and hence the frequency thereof.

Abstract: An inboard type magnetic system for an electrodynamic transducer which has a reduced height and magnetic flux leakage by making use of a manganese-aluminum-carbon system alloy magnet anisotropized by warm extrusion.

Abstract: A phase mask comprised of a square array of phase shifting areas arranged in pseudo-random pattern is illuminated with a beam of electromagnetic radiation, as a result of which an array of pseudo-randomly phase shifted beams emerges from the phase mask and impinges upon an object transparency to be intensity-modulated thereby and come to a focus on a Fourier transform plane. The power spectrum of the beams distributes in orthogonal directions on the Fourier transform plane from its center maxima in a distinct pattern of series of fringes. The technique of apodization is employed to suppress the fringes to thereby reduce the coherent noise of a hologram to a minimum.

Abstract: A station selector comprising a first memory for memorizing the first decimal digit of a given channel number in a form of a corresponding binary signal, a second memory for memorizing the second decimal place digit of the channel number in a form of corresponding binary signal, first and second binary-to-decimal converters for converting the contents of the first and second memories into corresponding decimal signals, a matrix circuit for combining the decimal outputs of both the first and second binary-to-decimal converters such that the resultant combination can be taken out from one of the intersections of a matrix corresponding to a given two-digit decimal channel number, and a preset voltage circuit having a plurality of preset channel selection voltage elements adapted to provide respective preset channel selection voltages and selecting one of the voltages for selecting a channel of a corresponding channel number in response to the output taken out from the afore-said intersection, the selected voltag

Abstract: The electrolyte is composed of a complex salt of 7,7,8,8-tetracyanoquinodimethane(TCNQ) and a nitrogen-containing polymer capable of dissolving the salt. The capacitor characteristics are largely affected by both the molecular weight and the amount of the polymer, and the capacitor of improved characteristics is provided by the use of the polymer of a mean molecular weight between 2,000 and 200,000 in an amount between 2 and 10% by weight of the TCNQ salt.

Abstract: A variable resistor provided with a mechanism which permits the tap resistance to be varied non-linearly; that is, the mechanism permits a contactor to be displaced at a varying rate in response to the operation of input means at a constant rate.

Abstract: An acousto-optic filter utilizing the far-off-axis anisotropic Bragg diffraction comprising an optically anisotropic crystal in which a light beam of incidence travels in a direction making a large angle with the crystalline axis and an ultrasonic wave travels in a predetermined direction. In the acousto-optic filter using a paratellurite crystal, the wavelength of the visible light is tuned by changing the frequency of the ultrasonic wave in a low frequency range below 100 MHz. The ultrasonic power required for driving the acousto-optic filter is about 1/500 that of the so far known acousto-optic filters. The bandwidth of the transmitted light can be changed from several angstroms to several hundred angstroms by selecting the incident angle of the light.

Abstract: In a system for cancelling time axis variations introduced into a frequency converted chrominance signal converted into a lower frequency range in the recording and reproduction of a color television signal with a small-size video tape recorder, in which system the cancellation of the time axis variations is effected by using a continuous reference signal obtained through an APC heterodyne system, the center frequency of oscillation of an APC oscillator is made n/m times the subcarrier frequency f.sub.s of the lower frequency converted chrominance signal (m and n being integers and n>m), and the reproduced frequency converted chrominance signal is heterodyned with a signal obtained by heterodyning a continuous signal obtained by dividing the frequency of the output signal of the oscillator by n/m in the presence of a steady reference signal at the same frequency as the standard color sub-carrier frequency to thereby obtain the cancellation of the time axis variations.

Abstract: A film coated with a dispersion of an N-vinyl compound, an organic halogen compound and a sensitizer in gelatin is preheated at 60.degree.-120.degree.C before an imagewise exposure to sensitize the film and to destroy fog-nuclei. After the imagewise exposure the film is subjected to a red light flood exposure for intensifying latent image, heating for development and flood light exposure for fixing to give a negative image of high contrast. The preheating may be applied to a film once exposed to extinguish the resulting latent image and thereby to be subjected to another exposure.