摘要:
A power source driving an electrical device includes a DC power supply providing a rectified and smoothed DC voltage from an AC main power, a self-oscillator energized by the DC power supply to generate a high frequency voltage, and a transformer which provides an output voltage from the high frequency voltage for driving a load circuit of the device. The characterizing feature of the power source resides in that the self-oscillator comprises a class C amplifier and includes a bias stabilizing circuit which provides a stabilized bias to the class C amplifier for assuring constant and optimum operation irrespective of possible variations in the supply voltage as well as load variations.
摘要:
The present invention provides fiber-reinforced ceramics containing at least one member of fibers and whiskers as distributed in a sintering ceramic matrix, which comprises the ceramic matrix being composed mainly of SiC, Si.sub.3 N.sub.4 and Si.sub.6-z Al.sub.z O.sub.z N.sub.8-z, where 0
摘要:
A switching power source comprising a pair of output terminals, a first switch element, a reactor and a filter which are connected to each other in series between one of the terminals of an input DC power source and one of the output terminals; a second switch element connected between a connecting node for the reactor and the filter and the other terminal of the input DC power source; and means for causing energy stored in the reactor to be fed back for regeneration to the input DC power source when the switch elements are turned off, wheein the switching power source is characterized by that the first and second switch elements are alternatively actuated for ON-OFF actions at a prescribed time ratio.
摘要:
A thermosensitive recording material is disclosed, which comprises (a) a heat insulating support having a foamed portion with minute voids therein, (b) an undercoat layer formed on the heat insulating support, comprising as the main component a film-forming polymeric material in an amount ranging from more than 50 wt. % to 100 wt. % of the entire weight of the undercoat layer, and (c) a thermosensitive coloring layer formed on the undercoat layer, comprising a leuco dye and a color developer for inducing color formation in the leuco dye upon application of heat thereto.
摘要:
A switching power source device provides a desired AC/DC output by producing a pulse width-modulated waveform through ON-OFF control of a pair or pairs of switching elements connected in series with an input power source, eliminating high-frequency components of the pulse width-modulated waveform with a smoothing choke. The switching power source device is configured so that the input power source will not be short-circuited and consequently suffer a voltage and/or current surge, even when both switching elements in the pair assume the ON status at the same time by dividing the smoothing choke into two portions. The two portions of the smoothing choke are connected in series with the input power source when the switching elements in the pair assume the ON status at the same time.
摘要:
A small-size copying machine has an image sensor and a print head for printing image information or visible data on copying paper. The copying machine is moved over an original document to read the visible data with the image sensor, and the visible data read by the image sensor is printed by the print head on the copying paper. The reading of the visible data with the image sensor is synchronized with the printing of the visible data onto the copying paper with the print head by fixing an end of the copying paper discharged from the copying machine and moving the copying machine with respect to the original document. The distance from the position where the visible data of the original document is read to an outlet slit for discharging the copying paper therethrough is equal to the distance from the position where the visible data is printed by the print head on the copying machine to the outlet slit, so that the data printed on the copying paper and the image of the original document will be overlapped. The copying machine may have a tapered body portion with a reading slit defined therein for facilitating the reading of the original document with the copying machine. The copying machine may have an inclined bottom panel for allowing the copying machine to be moved easily over the original document. The copying machine may also have on sides thereof markings for indicating a width and a position where the original document is to be copied.
摘要:
A key signal such as a TV signal or the like is provided to a liquid crystal TV panel, by which an image of a desired shape is displayed on the display screen of the liquid crystal TV panel at a position where an optical effect is intended to be produced. Light from a light source is applied to the liquid crystal TV panel, transmitted or reflected light therefrom is incident to an optical filter, and the image of transmitted light therefrom is picked up by a TV camera. The video output of the TV camera is mixed, by a video mixer, with a video signal of the image to be added with the optical effect.
摘要:
The present invention relates to a sintered product containing silicon carbide as a main component which comprises a phase(a) containing at least one metal selected from among Al, Sc, Y and rare earth elements and oxygen, a particle phase(b) comprising at least one metal carbide selected from among carbides of Ti, Zr, Hf, Va, Nb, Ta, W and the like, a composite particle phase(c) comprising said phase(a) and said phase(b) surrounding the phase(a) and silicon carbide matrix(d) in which the above phase(a), (b) and (c) are dispersed.The silicon carbide sintered product of the present invention exhibits a remarkably high strength and a remarkably high toughness which have not been attained up to this time, so that it can form various heat-resistant structural materials having a high reliability.
摘要:
A television receiver having a video signal receiving circuit for receiving a video signal, a vertical synchronizing signal and a horizontal synchronizing signal, a signal processing circuit for supplying the video signal to a cathode ray tube, a vertical deflection circuit for supplying a vertical deflection signal to the cathode ray tube in response to the vertical synchronizing signal, a horizontal deflection circuit for supplying a horizontal deflection signal to the cathode ray tube in response to the horizontal synchronizing signal, a frequency detector circuit connected to the video signal receiving circuit for detecting the frequency of the horizontal synchronizing signal and deriving a control signal in response thereto and a control circuit connected between the frequency detector circuit and the horizontal deflection circuit for controlling the latter in response to the control signal from the former. In this case, the horizontal deflection circuit includes a circuit for changing the duty cycle of a horizontal drive pulse such that the duty cycle increases when the horizontal frequency becomes higher.
摘要:
A high toughness silicon nitride sintered body comprises silicon nitride as a main component and at least one member selected from the group consisting of silicides and carbides in the form of plate particles, of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and W. In the sintered body, the longer diameter d.sub.1 of principal plane of plate of the plate particles and the shorter diameter d.sub.2 of the same plane has a relation of d.sub.1 /d.sub.2