Showing papers by "Panasonic published in 1975"

Scanning apparatus for an electrophoretic matrix display panel

Abstract: A scanning apparatus for an electrophoretic matrix display panel, has a horizontal (X-line) electrode driving circuit to provide a selecting pulse, a vertical (Y-line) electrode driving circuit to provide a data pulse, and an information signal supply means. An electric field is imposed across cells of an electrophoretic suspension layer to change the optical reflective property of the cells in a predetermined sequence after a pause interval by the horizontal and vertical electrode driving circuits. This causes operation of the display panel without cross effect.

Phase-locked loop circuit

Abstract: A phase locked loop circuit comprises a phase comparator having an operation range with specific limits for phase comparing A voltage-controlled oscillator produces an output at the output of the phase locked loop At the same time, the oscillator output is fed to the phase comparator A detector circuit, supplied with the output of the phase comparator, detects any exceeding of a specific limit of the phase by comparing the operation range of the phase comparator with a phase deviation of the oscillator output signal fed to the phase comparator The detector produces an output correction voltage An adder circuit adds this output correction voltage and an output error voltage of the phase comparator and supplies the resulting added voltage, as a control voltage, to the voltage-controlled oscillator This phase locked loop operates in a state wherein the lock range thereof has been equivalently expanded by the correction voltage

Optical bar code reader

Abstract: An optical reader including a plurality of fixed mirrors disposed on an imaginary circumference, a light source for emitting a light beam, a rotating mirror receiving the light beam from the light source and directing the reflected light beam to the plurality of fixed mirrors successively so as to form a plurality of retarded scanning light beams projecting on an object, and photo-electric converter means for receiving lights reflected by the object and generating an electric signal. The optical reader does not require mechanical synchronization. Cleaner means may be provided to brush off dust from the surfaces of the fixed mirrors.

Electrophoretic matrix panel

Abstract: An electrophoretic matrix display panel is composed of a first insulating substrate having a first set of strip-shaped parallel electrodes thereon and a voltage non-linear resistive layer on the first set of parallel electrodes. Dot-shaped intermediate electrodes isolated from each other are positioned on the voltage non-linear resistive layer, and an electrophoretic suspension layer consisting of a suspending medium and at least one electrophoretic material suspended therein is placed over the intermediate electrodes and contained thereon by a frame. A second set of parallel electrodes extending in a direction transverse to the direction of the first set of electrodes is placed over the frame and the electrophoretic suspension layer, and a second insulating substrate is provided thereover. The two sets of parallel electrodes cross to define cross points at which the dot-shaped intermediate electrodes are positioned and which constitute picture elements of the matrix display panel.

Solid state color imaging apparatus

Abstract: A solid state color imaging apparatus with a color encoding filter and a solid state area imaging device for producing a color signal representing an optical image of an object. The color filter is formed from a plurality of pairs of color filter strips arranged one above the other in a vertical scanning direction, each of which color filter strips consists of alternating transmissivity filter elements of two different colors. The color filter is placed on the imaging device so that each photosensitive element of the imaging device is covered with a corresponding filter element. During the self-scanning of the area imaging device, first and second signals which represent color difference signals are derived therefrom alternately in the successive scan lines, from which the color signal is produced.

Fourier-transform holography by pseudo-random phase shifting

Abstract: A phase mask comprised of a rectangular array of phase shifting areas arranged in a pseudo-random pattern is illuminated with a beam of electromagnetic radiation. The array of pseudo-randomly phase shifted beams is focused on a Fourier transform plane on which the power spectrum of the beams distributes in two orthogonal directions from its center maxima. The phase shifting areas are arranged in such a manner that there is an approximately equal number of phase shifts for each of the different phase shifting areas with a constant phase relation between orthogonally adjacent phase shifting areas. The center maxima of the spectrum is confined to a rectangular-shaped area and uniformly distributed by suitably selecting the number of different phase shifts. Coherent noise on the reconstructed image is effectively eliminated.

Water-proof sound apparatus

Abstract: A water-proof sound apparatus comprising a sealed cabinet, filter means attached to said cabinet which is permeable to gases and impermeable to liquids, a speaker attached to said cabinet which has a water-proof construction, and a grill covering the front of said speaker. The above sound apparatus when used can be floated in water, and it can be washed with city water and the like. The relationship between the outside atmospheric pressure and the pressure in the cabinet can be adjusted in accordance with the changes in the atmospheric temperature, the atmospheric pressure, and the temperature in the cabinet, so that an excellent sound effect can be attained at all times.

Electro-optical display device

Abstract: A non-liquid crystal organic compound having positive dielectric anisotropy is mixed with a nematic liquid crystal composition having negative dielectric anisotropy to obtain a nematic liquid crystal composition having positive dielectric anisotropy, which is used as an electro-optical element. Thus, the present invention aims at development of new use of the materials.

4-Channel headphones

Abstract: A structure of four-channel headphones having sound insulating means between front and rear channel driver units, and tone control means only for the front channel tones, said sound insulating means being formed of foam material which transmits low-pitched tones and absorbs high-pitched tones. Separation of the front and the rear channel tones is improved to closely resemble four-channel sound reproduction in a free field and the output levels of the medium-high range tones of the two front channels are made variable.

Method of producing sheet-formed bactericidal article

Abstract: A sheet of partially acetalled polyvinyl alcohol is used as the substratum of the article, and a sparingly soluble silver halide is precipitated on the sheet from an aqueous phase such as an ammoniacal silver chloride solution

Pan detector for an induction heating apparatus

Abstract: Electromagnetic coupling between a pan or utensil load to be heated by magnetic induction and a source of high frequency magnetic flux is sensed by detecting a current which is indicative of the electromagnetic coupling by means of a current transformer. The detected current is compared with a reference level. Intermittent generation of the magnetic flux is commenced when, for example, a small magnetic metal object is inadvertently placed as a load with the result that the detected current becomes lower than the reference level. This allows intermittent check for the presence and absence of the inadvertently placed load for subsequent cooking operations and minimization of the heat generated therein.

Control element having liquid layer attainable to geometrically uneven state in response to electrical signal

Abstract: A device comprising a support member of a solid material, a liquid material in intimate contact with and supported by the support member and an electrical means for creating an electric field having an electric vector in a direction parallel to the interface between the two materials to cause an electroosmotic movement of a portion of the liquid material and a resulting patterned unevenness of the configuration of the liquid material, wherein the liquid material contains a derivative of silane or siloxane which has a functional group having chemical affinity with solid organic materials useful as the support member, typified by vinyl, methacryloxy, cycloepoxy, mercapto and chlorine radicals, and/or another functional group having chemical affinity with inorganic materials useful as the support member, typified by alkoxyl group. When the solid and liquid materials are transparent, the device functions as an electrically controllable optical lens.

Ultrasonic generator with combined oscillator and current regulator

Abstract: An ultrasonic generator comprising an ultrasonic transducer having a natural frequency at which the dynamic admittance becomes maximum; a main circuit consisting of a switching circuit or first current regulator and a second current regulator connected in series to said switching circuit or first current regulator, the ultrasonic transducer being interconnected between an electrical source and the junction between said switching circuit or first current regulator and the second current regulator; a driving circuit for alternately driving the switching circuit or first current regulator and the second current regulator at a frequency equal to or substantially equal to the natural frequency of the ultrasonic transducer, thereby supplying the driving current thereto; and a feedback circuit for deriving an AC voltage in proportion to the magnitude of the driving current and feeding back this voltage to the driving circuit.

Vibration detecting device having a piezoelectric ceramic plate and a method for adapting the same for use in musical instruments

Abstract: A vibration detecting device adapted to be mounted on a musical instrument, such as a guitar or a violin, or a mechanical conversion apparatus for detecting sound generated by the guitar or the like or other vibration is provided, which is of simple structure having a piezoelectric ceramic plate housed in a case, and has a high sensitivity and an excellent frequency characteristic. A method for adapting the vibration detecting device is also provided.

Apparatus for driving liquid crystal display device wherein the signal applied thereto is varied in accordance with the temperature of the device

Abstract: Apparatus driving liquid crystal display device including a liquid crystal layer provided with electrodes on its two opposite surfaces, comprising means for applying a first signal for designating the electrode position and a voltage signal having a higher frequency to the electrodes on one surface, and for applying an input signal and the signal of said higher frequency to the electrodes on the other surface. The signals are controlled by another signal of different frequency to drive the display device with an ac voltage. Temperature compensation can be performed by varying the magnitude or the frequency of the voltage signal according to the temperature level.

Ice cream machine

Abstract: Machine adapted to be incorporated in a refrigeration chamber of a refrigerator to make ice cream, comprising means for containing an ice cream mix in an agitation vessel and agitating the same, and means for causing an air layer on the outer surface of the agitation vessel to move The provision of the air layer moving means is effective to promote heat exchange between the outer surface of the agitation vessel and the cold air in the refrigeration chamber by forcedly moving the air layer which might otherwise interfere with the exchange of heat between the outer surface of the agitation vessel and the cold air in the refrigeration chamber

Electro-optical device

Abstract: An electro-optical device using a liquid crystal consisting of 99.9 to 30 wt.% of at least one nematic liquid crystal and 0.1 to 70 wt. % of at least one optically active liquid crystal compound, (+)-p-alkoxy-p'-(2-methylbutyl)azoxybenzene. Such a device has a better display performance than similar devices because the mixture has a threshold voltage and a rapid response to an electric signal applied to the device, and so it is very practical for a matrix display device.

Antenna mount for receiver cabinet

Abstract: An antenna apparatus for use in a television receiver set or the like is provided. The apparatus has an antenna body which comprises a hollow resin cover having a plug pin integrally formed at one end thereof and an antenna pipe provided at other end thereof. An elastic conductor is mounted in the resin cover for electrically connecting the plug pin with the antenna pipe. The antenna body thus constructed can be detachably mounted on the television receiver set.

Ink ejection type writing unit

Abstract: A writing unit for applying fluid droplets to a surface includes a chamber which is divided into an outer chamber portion and an inner chamber portion which are connected by a connecting channel. A discharge channel is connected to the outer chamber portion in alignment with the connecting channel. A piezoelectrical transducer is provided adjacent the inner chamber portion opposite to the outer chamber portion to produce short duration pressure increases to eject the liquid in the chamber from the discharge channel in pulsed jets to the surface. The inner and outer chamber portions are communicated to the atmosphere by respective vent passageways to withdraw the air in the chamber when the writing unit is first loaded with liquid and the bubbles introduced into the liquid in the chamber during normal operation. The vent passageways are closed during ink ejection process.

Narrow track MR head with side shields

Abstract: A magnetic head consists of a magnetic flux converging core having a magnetic gap and a magnetoresistive effect element which forms a magnetic circuit and which is arranged in the same plane as the magnetic gap. The direction of thickness of the magnetic circuit is aligned with the direction of width of a track of a record medium, and shielding plates of ferromagnetic material are arranged on both sides of the plane.

Multi-element magnetic head

Abstract: A multi-element magnetic head having a plurality of magnetic heads, in which a common electrode common to the coils of the individual heads is provided. By this construction the number of electrodes is reduced and also the area required for contact between leads from an external circuit and electrodes are reduced. Thus, it is made possible to reduce the head pitch of the magnetic heads.

Sealed thermostatic heater

Abstract: A sealed thermostatic heater for use in a hair curling iron which uses a positive temperature coefficient (PTC) thermistor as a heat source together with a wire-wound heater, coated heater or ceramic heater.

Speckle reduction in holography with a spatially incoherent source

Abstract: High quality holograms of flat objects are produced by developing an achromatic-fringe system that consists of a monochromatic but spatially incoherent source, a holographic beam splitting device, and a pair of Fourier transform lenses. The effects of using an incoherent extended source and the transfer characteristics of the holograms are discussed. Emphasis is also placed on the advantages of developing lens Fourier transform holography along with the practical lens systems. A further possible extension of the system to attain high storage density as well as high quality holograms is proposed by making use of a new type of pseudorandom phase sequence.

Electrolytic capacitor having a conductive graphite particles layer between organic solid electrolyte and cathode

Abstract: The capacitor has a conductive layer, which is a dispersion of fine particles of graphite in a solidified polymer amounting to from 1 to 10% by weight of graphite, between and in intimate contact with a cathode and a solid electrolyte layer which is formed on an anodized valve metal and made of a semiconductive salt of 7,7,8,8-tetracyanoquinodimethane and a polymer. The conductive layer is formed by applying a suspension of graphite particles, the mean particle size of which preferably ranges from 1 to 7 μm, in a solution of a polymer in a low viscosity and easily evaporable solvent, e.g. ethanol, onto the electrolyte layer followed by drying at or slightly above room temperature to evaporate the solvent and solidify polymer.

Container for magnetic tape

Abstract: A cassette for accommodating a magnetic tape designed for use in a magnetic recording and/or reproducing apparatus includes a protective covering provided at an access opening of the cassette into which access opening a transducer head is adapted to project to contact a portion of the magnetic tape. The protective covering is movable between opened and closed positions and is normally biased to the closed position to shield such portion of the magnetic tape from the outside. When the protective covering is moved to the opened position, such portion of the magnetic tape is exposed to the exterior of the cassette for permitting the transducer head to contact such portion of the magnetic tape. The cassette is further provided with a braking lever which applies a braking force to both of the reels to prevent the magnetic tape from being loosened.

Ghost signal eliminating system

Abstract: A ghost signal eliminating system which eliminates a ghost by delaying a video signal through a variable delay line by the delay time of the ghost from the true image and subtracting the delayed video signal from the original video signal. The variable delay line comprises a fine adjusting circuit for fine-adjusting the delay time and a coarse adjusting circuit for coarse-adjusting the delay time, the coarse adjusting circuit being controlled by a detection voltage for a control voltage level and the fine adjusting circuit being controlled by a voltage which is the difference between the control voltage and the detection voltage.

Method of making crystal films

Abstract: A crystal film such as a piezoelectric crystal film is formed by sputtering of source material which is in the form of a convex curved surface or a polyhedral surface, and the formed film has crystallographic properties which can be very well controlled.