Abstract: A multi-mode display device is made integral with a multi-mode video signal recording and play-back device to enable a control circuit and a control signal to be made in common to each other, With this arrangement, a circuit size can be reduced and at the same time a circuit configuration can be simplified. In addition, an operation of a circuit not related with the play-back signal is controlled or stopped by using a common control circuit and then a consumption power can be reduced.

Abstract: An abrasive cloth dresser which can efficiently remove reaction products soaked into abrasive cloths for polishing semiconductor wafers etc. without scattering the reaction products. The abrasive cloth dresser includes a rotating hollow arm shaft 7, a high-pressure pure water jetting head 8 provided at a distal end of the hollow arm shaft, and a brush hood 11 provided at a distal end of the high-pressure pure water jetting head 8 and having a brush 16 planted thereto. The high-pressure pure water jetting head 8 includes a jet nozzle 83 through which high-pressure pure water is jetted for impacting reaction products soaked into a piece of abrasive cloth 3 to come out for removal. The brush 16 is elliptical in shape, and has a planted bristle density which is lower in a brush left-hand portion 161 near the high-pressure pure water injection center IC, but higher in a brush central portion 162 and a brush right-hand portion 163.

Abstract: The present invention relates to a multiscreen display apparatus in which one large screen is formed by combining screens of a plurality of display units. The multiscreen display apparatus includes data converters respectively provided in the display units, the data converters receiving video signal data represented in a digital form and correcting the video signal data according to correction data obtained on the basis of display characteristics of the display units to make luminance or color shading of a plurality of divisional regions of the screen of each display unit uniform, and a control unit for controlling data correction operations of the plurality of data converters as a whole.

Abstract: A liquid crystal projection display capable of functioning at a high light capturing efficiency and a high relative corner illuminance comprises a light source means including a light source, a liquid crystal panel means, a projection lens means and a screen means. A liquid lens formed by sealing a liquid in a space between opposite transparent members is disposed near the light source or the real image of the light source to enhance the relative corner illuminance without reducing the light capturing efficiency by multiplying the angle of divergence of light rays emitted by the light source by the reciprocal of the refractive index of the liquid. A first optical system disposed on the entrance side of the liquid crystal panel is provided with a relative corner illuminance enhancing means comprising a first light converging means disposed relatively near to the light source means, and a second light converging means disposed relatively remote from the light source means.

Abstract: In a display panel including a plurality of signals lines along a column direction and a plurality of scanning lines along a row direction for applying a display signal to display elements forming pixels arranged in a matrix form of rows and columns on a substrate, a switching arrangement for connecting at least two display elements to a signal line in each row is line-sequentially scanned by the scanning lines so that the display signal is time-serially applied through the same signal line to each of the at least two display elements connected to that signal line. Thereby, total number of the signal lines can be reduced to a value equal to or smaller than the number of display elements in the row direction.

Abstract: In the preparation of m-chlorobenzotrifluoride (m-CBTF) by reaction between benzotrifluoride and chlorine gas, a combination of a chloride of a metal having a valence of 3 to 6 and a small amount of iodine is used as catalyst. Alternative to iodine use can be made of an iodide that liberates iodine in the presence of chlorine. The catalyst exhibits high selectivity for m-CBTF and is effective for increasing the ratio of m-CBTF to p-CBTF in the reaction product.

Abstract: A scanning speed modulating apparatus for a television receiver. A differentiated signal derived by differentiating a video signal is supplied to a horizontal deflecting coil, so that a current having a waveform corresponding to that of the differentiated signal and superposed on a horizontal deflecting signal flows through the horizontal deflecting coil.

Abstract: A color video signal reproducing circuit for an index type television including a phase detector and a phase adjusting circuit in which the phase detector detects the phase difference between an index signal of a present time and an index signal which is one horizontal scanning period prior to the present time in a range within 360.degree. of phase, the phase detector then outputs a phase control signal which is indicative of the phase difference, and a phase adjustment circuit receives the present index signal and changes the phase of the input index signal corresponding to the phase control signal of the phase detector so as to output a new index signal for driving the index type television. The phase of the new index signal is corrected so as to comply with the color video signal having a different horizontal scanning frequency.

Abstract: Disclosed is a chroma scanning circuit used in a beam index type color picture reproducing apparatus, the circuit being provided with an inductance element connected in series to a horizontal deflection coil, and a scanning signal generation circuit connected to a junction between the horizontal deflection coil and the inductance element. The impedance between the junction and the earth at the chroma scanning frequency is increased by the inductance element to thereby make a chroma scanning signal generated from the chroma scanning signal generation circuit flow easily in the horizontal deflection coil.

Abstract: A frontal light extraction type beam-indexing color picture tube arrangement comprises a phosphor screen which is formed on the inner surface of the tube panel and includes an array of color phosphor stripes each of which has an appropriate afterglow time and an array of index phosphor stripes each of which has a short afterglow time and emits a light index signal representative of the scanning position of an electron beam in the forward direction of the tube panel. A photoelectric converter for receiving the light index signal is provided in front of the tube panel.

Abstract: A beam-indexing color television receiver having a phosphor screen including one index stripe for every predetermined integral number of phosphor stripe sets each including a red, a green and a blue phosphor stripe. The minimum bias current is supplied to the picture tube only upon detection of a chrominance signal within a predetermined hue range around a specific chrominance signal corresponding to the phosphor stripe which is in the middle between adjacent index stripes on the phosphor screen, thus attaining a superior color saturation and contrast.

Abstract: A sawtooth wave generated in a sawtooth wave generator circuit of a vertical deflection circuit assumes a predetermined maximum voltage at the start of a vertical scan and a minimum voltage which changes depending on a vertical cycle period at the end of the vertical scan. A pulse generator generates a sampling pulse at the end of the vertical scan so that the sawtooth wave voltage at the end of the vertical scan is sampled by the sampling pulse. The sampled sawtooth wave is held until a next sampling pulse is generated so that a D.C. voltage which changes in accordance with the vertical cycle period is produced. The sawtooth wave voltage is level-shifted by a level shifting circuit and thereafter amplified before it is supplied to a vertical deflection coil. The amount of shift by the level shifting circuit is controlled by the D.C. voltage so that the sawtooth wave having a stabilized D.C. component is amplified. Accordingly, a vertical deflection circuit free from D.C.

Abstract: A pair of output transistors forming a single-ended push-pull circuit are alternately turned on and off at a vertical cycle to supply a vertical deflection current to a vertical deflection yoke. A low voltage winding is wound on a horizontal flyback transformer connected to a horizontal output transistor. First and second rectifying circuits are provided for rectifying and filtering a horizontal scan period portion and a horizontal flyback portion, respectively, of the voltage developed across the winding, and d.c. outputs of the rectifying circuits are fed to the push-pull circuit as operating power therefor. The first rectifying circuit includes a capacitor-input filter circuit while the second rectifying circuit includes a choke-input filter circuit, a critical current of which choke-input filter is established between a maximum current and a minimum current required for the push-pull circuit.

Abstract: A vertical deflection circuit comprises a first transistor, the base of which is impressed with a vertical synchronizing signal so that it is turned on during a vertical blanking period, while it is turned off during a vertical scan period, the collector of which is connected to a constant voltage supply and the emitter of which is connected to a capacitor so that the capacitor is charged to a predetermined voltage during the vertical blanking period. A second transistor has its collector connected to the junction point of the emitter of the first transistor and the capacitor, and the base thereof is connected to another constant voltage supply. Two resistors having a low resistance are inserted in series with a vertical deflection coil and the junction point of the resistors is coupled to the emitter of the second transistor through a feedback resistor. The charge stored in the capacitor during the vertical blanking period is discharged through the second transistor during the vertical scan period.

Abstract: Oligomers of tetrafluoroethylene are prepared by oligomerization of tetrafluoroethylene in an organic solvent in the presence of a fluoride compound and a crown ether. The catalytic action of the fluoride compound can be far improved when the fluoride compound is used together with a crown ether.