Showing papers by "Sony Broadcast & Professional Research Laboratories published in 1971"

4f-5d Transitions of Tb 3+ and Ce 3+ in MPO 4 (M=Sc, Y and Lu)

Abstract: Sharp no-phonon lines associated with phonon sidebands have been observed in 4 f -5 d excitation spectra for Tb 3+ and Ce 3+ as well as in emission spectra of Ce 3+ , in Sc, Y and Lu orthophosphates at low temperatures. The spectra manifest themselves as if the 5 d electron did not see the tetragonal field component. Energy level schemes of the 4 f 7 5 d (Tb 3+ ) and 5 d (Ce 3+ ) configurations are discussed. The 4 f -5 d transition matrix elements are calculated for Ce 3+ . The phonon sidebands are believed to reflect the vibrations of the pure lattices.

Stereophonic sound reproducing system

Abstract: A stereophonic sound reproducing system having left and right audio transducer means arranged relatively close to each other, and a combiner means connected to a stereophonic sound signal source for generating left and right signals R and L and combining the left and right signals R and L to produce a combined left sound signal L- gamma R and a combined right sound signal R- gamma L ( gamma representing a complex number coefficient). These combined sound signals L- gamma R and Lgamma R are fed to the left and right sound transducer means, thereby stereophonic sound is reproduced.

Image pickup tube

Abstract: In an image pickup tube for a color television camera having a photoconductive layer for the conversion of images projected thereon into an electrical output and onto which a color separated image of an object to be reproduced is projected through a color filter which is part of the tube or separate therefrom and a pair of indexing electrodes disposed in close proximity to the photoconductive layer to electrically produce an index image on such layer in response to the application of different voltages to the indexing electrodes; two photovoltaic cells are included in the image pickup tube and electrically connected in parallel with each other between the indexing electrodes with their polarities reversed, and the photovoltaic cells are alternately activated by radiant energy originating outside the tube to provide the different voltages for producing the index image so that the electrical output is a composite signal containing a color video signal corresponding to the color separated image and a balanced index signal corresponding to the index image and by which individual color component signals may be separated from the color video signal. The electrical output is preferably derived at a junction between a pair of seriesconnected resistors also connected between the indexing electrodes; and a biasing voltage is also applied to the indexing electrodes by way of that junction.

Gaseous glow indicator tube formed on a substrate with a plurality of insulating layers

Abstract: A gaseous glow indicator tube including a method of manufacturing and aging in which the elements of the indicator electrodes are arranged in a single plane by plating conducting segments on a base insulating plate which also carries a plurality of element energizing electrodes. The various elements of the indicator elements are individually connected to the energizing electrodes. Anode electrodes are mounted adjacent the indicator electrodes and are connected to anode energizing leads so as to selectively energize various indications. A method for aging the gaseous glow indicator is also disclosed.

Adsorption of polyamides and the stability of dispersion

Abstract: The stability of red iron oxide, titanium dioxide, and carbon black dispersed in cyclohexanone and isopropyl alcohol solutions of fatty polyamides was studied by measuring adsorption, viscosity, zeta potential, and sedimentation volumes. It was found that the stability of dispersion is markedly affected by the adsorption of polyamides. The greater the amount of adsorption, the greater the stability. On the other hand, a negative adsorption impaired the stability. A stabilization mechanism of polyamide adsorption was discussed in terms of entropic repulsion, electrostatic repulsion, and van der Waal's attraction.

Magnetic recording and/or reproducing apparatus with automatic tape loading and unloading device

Abstract: A magnetic recording and reproducing apparatus of the type having a tape guide drum and at least one rotary head to scan a tape wrapped on the drum is provided with a device for automatically wrapping the tape on the guide drum, for example, from a cassette or cartridge containing the tape. Such device has a rotatable support, in the form of a ring, extending around the drum and carrying guides, and a tape engaging member also mounted on the ring and being movable into and out of a guide path spaced from the drum and defined by the guides. The tape engaging member, in an inactive condition of the apparatus, is displaced out of the guide path to engage the tape in the cassette or cartridge, and is moved into the guide path upon turning of the ring to draw a loop of the tape from the cassette or cartridge and to wrap one side of the loop about the guide drum while the other side of the loop is engaged by the guides and maintained in the corresponding guide path.

Knoop Hardness Anisotropy and Plastic Deformation in Mn-Zn Ferrite Single Crystals

Abstract: The Knoop hardness anisotropy and plastic deformation markings around the DPH indentation were investigated for an Mn-Zn ferrite single crystal. Knoop hardness values, which depended primarily on the crystallographic direction, were represented on a standard stereographic triangle. The hardness was maximum in the direction and minimum in the and directions. The patterns of the plastic deformation markings show that the ferrite deforms plastically at room temperature by {110} and {111} slip.

System for maintaining acceptable environmental conditions in an indoor swimming pool enclosure

Abstract: A buoyant sheet material and apparatus utilizing the material are disclosed for preventing evaporation of water in an indoor swimming pool when the pool is not in use. The sheet material is formed with a layer of buoyant foamed plastic material and a thinner layer of water-impervious plastic material and it is wound on a roll rotatably mounted adjacent one side of the pool. When the pool is not in use, the sheet material is drawn from the roll and placed on the surface of the water in the pool to prevent evaporation of the water and to thereby maintain a relatively low humidity in the pool enclosure.

Method of making a magnetic powder

Abstract: A METHOD OF PREPARING POWDERS HAVING IMPROVED MAGNETIC PROPERTIES FOR USE IN THE MANUFACTURE OF RECORDING TAPES IS SHOWN. A COLLOIDAL SUSPENSION OF IRON OXIDE IS FORMED. A SOLUTION OF A SALT OF COBALT AND/OR NICKEL IS ADDED TO THE COLLOIDAL SUSPENSION AND THE MIXTURE IS AGITATED AND THE PH THEREOF CONTROLLED TO FACILITATE ABSORPTION OF THE COBALT AND/OR NICKEL SALTS ON THE IRON OXIDE. THE IRON OXIDE IS THEN REMOVED FROM SUSPENSION, WASHED, DRIED AND GROUND AND THEN DEHYDRATED TO UNIFORMLY DIFFUSE THE COBALT OR NICKEL INTO THE IRON OXIDE. THE MASS IS THEN REDUCED TO FORM THE METALLIC ALLOY. THE POWDERS FORMED ACCORDING TO THE INVENTION HAVE SUBSTANTIALLY INCREASED VALUES OF COERCIVE FORCE AND MAGNETIZATION AND ARE PARTICULARLY SUITED FOR USE IN MASTER VIDEO TAPES.

Method of making a lead assembly

Abstract: In making a lead assembly, for example for connection to integrated circuit or semi-conductor devices, layers of a lead metal, such as, nickel or nickel alloy, are provided on selected areas of both surfaces of a relatively thick base metal sheet, for example, of copper or copper alloy, which is etched through using the lead metal layers as a mask for precisely determining the portions of the base metal sheet to be removed, with the remaining parts of the base metal sheet and the lead metal layers integral therewith defining the assembly of leads which are joined by an outer frame to be severed from the leads after the connection of the latter to electrodes of integrated circuits or semi-conductor devices. The lead metal layers on one surface of the base metal plate may extend beyond the lead metal layers on the other plate surface so that, upon etching through the base metal plate from both surfaces thereof, the lead metal layers on said one surface of the base metal plate project beyond the remaining parts of the latter to constitute tips of the corresponding leads.

Color image pickup device

Abstract: A color image pickup device of the type in which the image is separated into individual colors by a striped filter and is focused on the photoelectric conversion layer of a camera tube. To avoid moire patterns in the reproduced television image, means are provided between the filter and the object being televised to form multiple images of the object spaced apart by an integral multiple of p/N in which 1/N is the duty cycle of the color component stripes and p is the pitch of the stripes.

Tape cartridge case

Abstract: A tape cassette housing having two covers pivotally joined together by a side. Both covers have recesses to receive the raised portions on the sides of a cassette so that the overall dimensions of the case need be only slightly greater than the maximum dimensions of the cassette. Locking means on the inside surface of the covers extend through one of the reel holes in the cassette to hold the two covers together and prevent the cassette from falling out.

Power transformer primary winding fuse arrangement

Abstract: A power supply for use with different AC line voltages, which includes a power transformer having a plurality of separate primary windings and a corresponding plurality of fuses connected thereto. The primary windings are connected to each other in several different ways to change the turns ratio of the power transformer depending upon the value of the voltage supplied thereto. Thus, a predetermined voltage is produced in the secondary winding of the transformer irrespective of the value of the supplied AC line voltage and the current flowing through each of the fuses is held substantially constant, during normal operating conditions, regardless of the manner in which the separate primary windings are connected.

Printed circuit board

Abstract: A PRINTED CIRCUIT BOARD INCLUDING AN EPOXY RESIN IMPREGNATED GLASS FIBER BOARD AND A COPPER FOIL LAMINATED THEREON WITH AN ADHESIVE IS SHOWN THE ADHESIVE IS COMPRISED OF A PHENOXY RESIN, A LOW MOLECULAR EPOXY RESIN AND A CROSS-LINKING AGENT THEREBETWEEN

Tape and cassette for cleaning magnetic recording heads

Abstract: A tape cassette for use in recording and reproducing apparatus having magnetic heads adapted to be engaged with tape in the cassette includes a generally hollow case, a pair of tape reels rotatably mounted therein, and a magnetic head cleaning tape having its ends respectively secured to the reels for winding thereon. The tape has a base formed of a non-woven fibrous material and a plurality of reinforcing threads are located on at least one side thereof for engaging the magnetic head during operation of the apparatus to wipe the head and remove dust and other impurities therefrom.

Magnetic recording and/or reproducing apparatus with signal muting during change of operative condition

Abstract: IN A MAGNETIC RECORDING AND/OR REPRODUCING APPARATUS CAPABLE OF REPRODUCING SIGNALS RECORDED ON A MAGNETIC TAPE DURING MOVEMENT OF THE TAPE IN BOTH FORWARD AND REVERSE DIRECTIONS, AT LEAST TWO MAGNETIC HEADS PICK UP THE SIGNALS FROM THE TAPE AND INDEPENDENT SIGNAL TRANSMITTING LINE ARE PROVIDED FOR TRANSMITTING THE SIGNALS FROM THE CORRESPONDING MAGNETIC HEADS TO A COMMON OUTPUT TERMI- NAL, SUCH SIGNAL TRANSMITTING LINES HAVING SWITCHING MEANS FOR MUTING THE SIGNALS DURING CHANGING OF THE OPERATIVE CONDITION OF THE APPARATUS AND ALSO FOR SELECTING THE SIGNAL OR SIGNALS TO BE REPRODUCING DURING MOVEMENT OF THE TAPE IN THE FORWARD OR REVERSE DIRECTION.

FM receiver noise suppression circuit

Abstract: In an FM receiver having a stereo demodulator circuit supplied with a composite stereophonic signal from which right and left channel audio signals, are reproduced, a noise suppression circuit which includes a pair of gate circuits connected to a pair of output stages of the demodulator circuit, a noise signal detecting circuit connected to an output stage of an FM discriminator and a control signal producing circuit supplied with a noise signal derived from the detecting circuit to produce a control signal. The gate circuits are controlled by the control signal to cut off audio signals from the demodulator circuit in the presence of a noise signal, thereby momentarily to cause the FM receiver not to reproduce the stereophonic signal.

A new technology for high-power IC

Abstract: The paper describes a new fabrication technology for a monolithic high-power linear IC. It is based on a novel process for controlling the epitaxial growth of single crystal regions and very fine polycrystalline regions on an IC substrate essentially in accordance with the specified mapping of the IC pattern. Polycrystalline regions are used in areas of isolation and collector lead paths which must be diffused deeply, and contribute to the most important characteristics required for the high-power IC, i.e., higher breakdown voltage and lower saturation resistance. A power capability far beyond any known in this field has been achieved. A typical example of the output power rating for an IC designed for use in a low-frequency SEPP-type power amplifier is 20-watts rms continuous service, and the total harmonic distortion content is less than 8 percent at 1 kHz at 40-volts source voltage.

Magnetic recording and/or reproducing apparatus

Abstract: In an apparatus for magnetically recording and/or reproducing signals, such as video signals, on a magnetic tape extending between and wound on supply and take-up reels, and in which the tape between the reels is selectively guided in a first path removed from a tape guide drum and in a second path that extends about at least a portion of the guide drum periphery for scanning of the tape by a rotary magnetic head associated with the guide drum; the driving of the tape in each of the first and second paths is controlled by a sensing device which includes a light source and a light detector defining a light path therebetween which is intercepted by each of the first and second tape paths so that the light detector receives or detects light from the source to halt the driving of the tape only when a transparent leader provided at least at one end of the magnetic tape intercepts the light path.

Metal fuel battery and system

Abstract: A METAL FUEL BATTERY HAVING A NUMBER OF CELLS, EACH CELL HAVING AT LEAST ONE GAS DIFFUSION ELECTRODE (POSITIVE ELECTRODE) AND ONE CATHODE COLLECTOR ELECTRODE (NEGATIVE ELECTRODE) PERIODICALLY BETWEEN WHICH A LIQUID ELECTROLYTE HAVING POWDER METAL FUEL DISPERSED THEREIN IS CAUSED TO FLOW IN A DOWNWARD DIRECTION. THE BATTERY IS USED IN A SYSTEM IN WHICH THE METAL FUEL IS REPLENISHED FROM TIME TO TIME AS IS ALSO THE ELECTROLYTE. D R A W I N G

Color television camera

Abstract: In a color television camera having a target structure which is scanned by an electron beam and on which is projected an image of an object in the field of view of the camera; the target structure comprises first and second groups of photoconductive elements, such as diodes, preferably formed in a semiconductor substrate and being arrayed in lines extending in the line scanning direction and rows extending at substantial angles to the lines, with the lines of the first group of diodes being alternated with the lines of the second group of diodes, color filter elements corresponding to the diodes, respectively, and being disposed between the latter and the object for forming color components of the projected image on the respective diodes, first electrodes connected to the first and second groups, respectively, of the diodes for applying to the latter an alternating signal having phase alternation by line and for picking-up a color video signal corresponding to the projected image in response to the conversion by said diodes of light projected thereon into an electrical output when scanned by the electron beam, and second electrodes arranged generally in the direction of the rows of diodes for receiving an alternating signal having phase alternation by field and for picking-up an index signal corresponding with the arrangement of the second electrodes along the line being scanned and having phase alternation by field. The color video signal and index signal thus formed are combined in a composite signal which is supplied to circuits by which the index signal is employed for deriving the individual color signals from the color video signal.

Color television receiver

Abstract: A color television receiver hue-control system that produces two sets of color-generating signals, one set being differentially controllable and the other not, to produce two kinds of reference color areas on the screen of a color cathode ray tube to be visible simultaneously. The hue of the first reference color in a first area is fixed, and the hue of the second reference color in an adjacent area is varied by the same hue adjustment control as that used to vary the hue in the reproduced television picture. The hue adjustment is achieved by adjusting the control to produce differential modification of the amplitude of one set of color-generating signals, either by direct amplitude modification or by phase shifting a demodulating carrier if the set of color-generating signals is modulated on a carrier, to produce coincidence of the hue of the two reference colors.

Machine for grinding an edge contour on a semiconductor wafer

Abstract: A grinding machine for producing a rounded chamfer on the edge of a workpiece such as a semiconductor wafer. The workpiece is attached to a revolving chuck and a grinding head having oblique resilient grinding members is located opposite the chuck. The grinding members lie along generators of a cone and extend beyond the edges of the workpiece and press against the edge. Semiconductor wafers are ground in this machine by pressing their edges against the resilient grinding devices while rotating the wafer and moving the grinding devices in a lateral circular path concentric with the axis of rotation of the wafer.

Control signal generator with selectively switchable duration control circuit

Abstract: A transmitter for producing control signals of precisely predetermined duration, for example, for remote control of a television receiver or other apparatus, has an oscillator operable to generate a signal, a switching transistor operable to connect the oscillator with an operating voltage source, and a switching assembly selectively operable to cause operation of the switching transistor and also to determine the charging time constant of a charging circuit by which the period of operation of the oscillator is controlled.

Amplifier protective circuit

Abstract: A protective circuit for protecting transistor amplifiers in which the transistors are interconnected with certain impedances and diodes with switching elements such that voltages and currents applied to the transistor are detected and utilized to sense when a condition exists which would injure the transistor. Bridge circuits and diodes are interconnected with the transistor to be protected and in certain embodiments a switching transistor is used with the bridge circuit and diode to protect the transistor.

Drive mechanism for use with information cards

Abstract: An information card drive mechanism comprising a pinch roller and a capstan driven by a motor for selectively driving the information card in one of two predetermined directions and at least three switches and an electronic logic circuit for controlling the driving direction of the motor.

Magnetic head with wear-resistant surface, and methods of producing the same

Abstract: A magnetic head core element, for example, of ferrite, is provided, at least at a surface thereof subject to wear, with an electrodeposited magnetic metal layer containing a dispersed powder that is harder than the metal. The powder-containing metal layer is electrodeposited by immersing the core, preferably after deoxidizing the surface thereof to receive the layer, in an electrolyte containing a salt of the magnetic metal and a dispersion of the relatively hard powder, and passing a current between the core, acting as a cathode, and an anode also immersed in the electrolyte.

Work holder for assembling a cathode ray tube envelope

Abstract: A cathode ray tube envelope consisting of a neck portion, a funnel portion and a panel portion having a rectangular screen is assembled with reference to the round portion of the funnel portion. The cross section of the round portion is circular and accordingly the geometric center of the funnel portion can be detected easily.

Plural-microscope with light indicator

Abstract: A plural-microscope, preferably having two stereoscopic microscopes, is further provided with a light indicator for projecting onto a specimen supported by the stage a light spot which is substantially smaller than the field of view of each microscope, and the light indicator and stage are made movable relative to each other for varying the position of the light spot on the specimen so that the light spot can be used to identify a selected portion of a specimen to be viewed simultaneously by the microscopes.

Frequency doubler circuit

Abstract: A frequency doubler circuit including a differential amplifier supplied with a signal of a predetermined frequency, for example, a pilot signal of 19KHz contained in an FM stereophonic signal, a pair of rectifier circuits coupled to outputs of the differential amplifier to rectify the signal of the predetermined frequency and a combining circuit to combine the rectified signals, whereby a signal of a frequency twice that of the signal supplied to the differential amplifier is derived at the output terminal of the combining circuit.