Showing papers by "Sony Broadcast & Professional Research Laboratories published in 1967"

Crystal Structure Determination of SbSI

Abstract: A change of atomic arrangement of SbSI between the paraelectric phase and the ferroelectric phase is investigated. Analyses are made on Weissenberg photographs taken at 35°C (paraelectric phase) and at 5°C (ferroelectric phase). In the paraelectric phase (space group D 2 h 16 - Pnam , lattice constants, a =8.52A b =10.13A c =4.10A), the atomic positions are: Sb( x =0.118 9 , y =0.124 3 , z =1/4), S( x =0.84 0 , y =0.05 0 , z =1/4), I( x =0.508 0 , y =0.827 6 , z =1/4); the thermal vibration of Sb ions along the c axis is relatively large with the mean square amplitude \bar U z 2 =(0.16) 2 A 2 . In the ferroelectric phase ( C 2 v 9 - Pna 2 1 ), the x and y parameters are substantially the same as those determined in the paraelectric phase. Major changes take place in the z parameters: Sb( z =1/4+0.04 8 ) and S( z =1/4+0.01) shift along the ferroelectric c axis with respect to iodine by 0.20A and 0.05A respectively. Evidences are shown that the phase transition is of displacive type.

Electron Spin Resonance of Photosensitive Fe 3+ Centers in CdSe

Abstract: ESR measurement has been carried out at X -band on isolated Fe 3+ (3d 5 , 6 S) in CdSe. The spin Hamiltonian parameters for Fe 3+ are estimated at 1.5°K as follows: g =2.043±0.002, a =(103±5)×10 -4 cm -1 , D =(602±3)×10 -4 cm -1 , and F =(-11±5)×10 -4 cm -1 . The influence of charge transfer from Fe 3+ to the surrounding ligands upon these parameters is discussed. Change of the valency of iron impurities caused by illumination is studied through the change of the intensity of Fe 3+ ESR signal. Following processes are elucidated. Light of 0.8 to 1.1 µ excites holes from Fe 3+ to the surrounding Se 2- ions; the excited holes are liberated thermally into the valence band. Light of about 7.4 µ excites electrons from Fe 2+ to the conduction band. Light of around 1.8 µ liberates holes from cadmium vacancies; a part of the liberated holes migrates through the valence band to Fe 2+ . Fe 3+ captures electrons from the conduction band, viz, acts as a recombination center for electrons.

Magneto-resistance element

Abstract: 1,200,379. Semi-conductor devices. SONY CORP. 6 Oct., 1967 [13 Oct., 1966; 30 Nov., 1966; 25 Feb., 1967], No. 45698/67. Heading H1K. A magneto-resistance device comprises a substantially intrinsic semi-conductor body 210 (Fig. 5) having spaced P- and N-type regions 203, 204 for injecting carriers into the body and at least one region 205 of high recombination rate so that upon application of a magnetic field carriers are deflected towards the recombination region to decrease the carrier concentration and lower the output current. The recombination region may be formed by polishing, grinding, sanding or etching the semi-conductor surface 210a or by diffusing in a deathnium impurity such as Cu, Au, Fe, Ag, Zn, Mn, Ni or Pt. The semi-conductor may be germanium, silicon or gallium arsenide, and in the case of germanium the P- and N-type regions can be formed by alloying In-Ga and Sn-Sb therewith. A further impurity region such as 214 may be formed in the body 210 to constitute, together with one of the regions 203, 204, a PIP or NIN transistor the characteristic of which also varies with the magnetic field. The body may be of rectangular parallelepiped shape, as shown, and have a second recombination region on the opposite surface 210b, one region having an impurity concentration of 10 15 atoms/c.c. and the other a concentration of 10 14 or 10 13 so that the recombination rates are different. Alternatively the body may be cylindrical with a triangular, circular, trapezoidal or polygonal section, the P- and N-type regions being located at the ends of the cylinder and one or more recombination regions being formed on the side faces or extending over the entire side surface. A process is described for making a device from a silicon substrate by forming a silicon dioxide layer on the surface of the substrate and diffusing in impurities through windows m the layer.

Reduction of CrO3into CrO2and Cr2O3under Very High Pressure and High Temperature

Abstract: High pressure and high temperature region under which chromium dioxide CrO2 can be synthesized was examined by using split sphere type of high pressure equipment. The experiments were performed under pressures up to 85 Kb and at temperature up to 1600°C

Color video signal generating apparatus

Abstract: 1,193,713. Colour television cameras. SONY CORP. 13 July, 1967 [15 July, 1966], No. 32225/67. Heading H4F. [Also in Division G2] Plural colour component signals are derived with the aid of a single pick-up tube 7, Fig. 1, by forming an image of a scene 1 on the tube target 4 through an optical path including a colour filter 8 and a cylindrical lens screen 9 in which the lens axes extend at right-angles to the line scan direction. The arrangement is characterized by a construction of filter 8 such that there are imposed intensity variations on at least two of the colour components in the line scan direction, the variations being such that generated signals corresponding to the two components exhibit the same carrier frequency but differ in phase whereby they may be separated in terms of phase. In one construction of filter, Fig. 3, the filter is divided into sections by two 90-degree-phase-displaced sinusoidal lines about an axis 14 which is disposed in the line scan direction. Sections G pass green light, section C green plus blue light, section Y green plus red light and sections W green plus red plus blue light. The resulting image which is formed on the tube target consists of a uniform green component together with red and blue components which vary in intensity sinusoidally in the line scan direction and repeat for each lenticule of screen 9. The red and blue variations are in phase quadrature. The tube output signal is separated by filters 22, 23 into a low frequency luminance component, consisting of the green signal together with the red and blue D.C. and Low frequency components, and a carrier component whose quadrature phase modulations are separated by detectors 24 and 25 to obtain red and blue signals. Reference signals to operate the detectors are obtained from oscillator 27 by way of a first phase shifter 30 and a second 90-degree phase shifter 31. Signals to synchronize the oscillator are produced by including an opaque strip 17D in the filter. Resulting signal components, which occur at the frequency of the colour carrier and harmonics thereof, are separated from the tube output signal by filters 26 and 29 and applied to a mixer stage 28. Filter 8 may be modified, Fig. 6 (not shown), to consist of a plurality of parallel sections similar to Fig. 3. An alternative construction, Fig. 7 (not shown), merely consists of parallel green, yellow, white and cyan strips. Alternative ways of producing signals to synchronize oscillator 27 are described with reference to Fig. 8 (not shown) in which electroluminescent light sources are combined with lens screen 9, or the shape and forms of the lenticules are modified. Reference is also made to the use of electroluminescent light sources to bias the target image so as to distinguish the signals produced by opaque strip 17D.

Data retrieval system

Abstract: In a data retrieval system employing a magnetic tape or other recording medium having index signals at intervals therealong for identifying respective tape portions and being moved past a head which is cyclically displaced to scan stripelike areas extending across the tape, the tape is driven at a high speed to rapidly bring a selected index signal near to the head and then the movement of the tape is continued at a low speed at which a plurality of the areas scanned by the head are in overlapping relation, and the head is operated to record or reproduce data signals only during one of its cyclical displacements upon the selected index signal reaching a predetermined position in the course of the continued low speed movement of the tape.

Electron Spin Resonance of Fe 3+ -Associated Centers in Cadmium Selenide

Abstract: Electron spin resonance of a Fe 3+ -associated center in cadmium selenide has been observed at liquid helium temperatures. The center responsible for the resonance has been identified as being a Fe 3+ ion occupying a cadmium site that is associated with a negatively charged defect on one of the six cadmium sites nearest to the Fe 3+ ion. The spin Hamiltonian for a Fe 3+ center of orthorhombic symmetry having S =5/2 is \(\mathscr{H}{=}g_{0}\beta\textbf{\itshape H}.\textbf{\itshape S}+D{S_{z}}^{2}+E({S_{x}}^{2}-{S_{y}}^{2})\), where the y -axis is rotated 16.5° away from the c -axis toward the line connecting a Fe 3+ ion with one of the six cadmium site nearest Fe 3+ and the x -axis lies in the (11\bar20) plane containing the y -axis. The effective g -values for the transition within the lowest Kramers doublet are given by g x =0.91±0.02, g y =9.24±0.06, and g z =1.68±0.03. The intensity variation of the resonance signal with irradiation of light of various wavelengths has been measured and can be interpret...

Electron Spin Resonance of Photosensitive Centers in Ag-Doped CdS

Abstract: Electron spin resonance experiments on Ag-doped CdS have been done at 1.5°K and at X-band. A resonance line characterized by the g -values, g // =1.226 and g ⊥ =1.509, is observed under irradiation of light in characteristic bands. As a possible model of the magnetic center, which is designated by the A center and is responsible for this resonance line, we present Ag 2+ occupying a Cd site in the crystal. From this model the behaviors of the center under illumination are discussed. An association of Ag + and a sulfur vacancy explains reasonably well the differences in the conditions of the appearance of A centers and electron trappipg centers among four kinds of CdS crystals which differ from each other only in the manner of incorporating the Ag impurities and in the crystal growth conditions. The relation between ESR measurements and luminescence ones is discussed.

Endless tape cartridge

Abstract: An endless tape cartridge for magnetic recording and reproducing, including first and second hubs rotatably mounted in a cartridge, and an endless tape wound on the first hub. The second hub may be selectively driven to move the endless tape forward fast. The tape is driven with a normal capstan and pinch roller during normal use but the second hub is utilized to move the endless tape forward when the tape is to be moved to a new position in a fast manner. In one modification a pinch roller engages the tape and presses it against the second hub and in a second modification the frictional engagement of the tape with the second hub moves it forward.

Color signal generating apparatus

Abstract: In a color video signal generating apparatus employing a single monochrome image pickup tube, an assembly of separating lenses disposed in front of the face plate of the tube to divide a real image of an object to be televised into stripelike image elements which are projected on the photoconductive layer of the tube and extend substantially at right angles to the scanning direction, and a color filter arrangement disposed in front of the separating lens assembly and having several filtering regions respectively passing light of different wavelength ranges to include, in each stripelike image element, corresponding color components; such filtering regions are arranged so that, considered in the direction across each stripelike image element, one of the color components is of substantially uniform intensity and other color components have different numbers of variations of intensity, whereby the image pickup tube produces a composite color video signal composed of nonfrequency modulated and different frequency modulated color video signals which can be easily frequency separated to obtain signals corresponding to color primaries.

Method for manufacturing color television receiver tubes

Abstract: A METHOD FOR MANUFACTURING COLOR TELEVISION SCREENS FOR CATHODE RAY TUBES COMPRISING THE STEPS OF PRINTING A SHADOW IMAGE OF A POST-DEFLECTION-FOCUSING GRID ON A PLATE, POSITIONING THE OPTICAL MASK RELATIVE TO A FACE PLATE IN ACCORDANCE WITH A SPURIOUS PATTERN RESULTING FROM LIGHT INTERFERENCE, AND FORMING COLOR PHOSPHORS ON THE FACE PLATE.