摘要:
A sampling circuit for a sampling oscilloscope comprises a sampling gate circuit receptive of an input signal to be sampled. A sampling pulse generator circuit develops narrow sampling pulses which are applied to enable the sampling gate circuit. Input signal samples from the sampling gate are applied to an amplifier which in turn applies input signal samples to another gate circuit. The other gate circuit receives gate signals developed in synchronism with the sampling pulses by a gate signal generator to enable the other gate circuit. When the other gate circuit is enabled an input signal sample is applied to a memory circuit which stores the input signal sample therein. A feed circuit and an output amplifier receive the output of the memory circuit. The feed circuit develops a first signal proportional to the input signal sample stored in the memory and applies the first signal to the other gate circuit when the other gate circuit is enabled to store a subsequent input signal sample in the memory circuit. The feed circuit develops a second signal proportional to the input signal sample stored in the memory by the same amount as the first signal and subtracts the second signal from the input signal to the output amplifier. The first and second signals developed by the feed circuit reduce amplitude fluctuations in the output of the sampling circuit.
摘要:
An attenuator for a wide range of frequencies has a dielectric plate supported within first and second outer-conductors. A rectangular resistive member is deposited on the surface of the dielectric plate and is contiguously interposed between two pairs of highly conductive electrodes. An impedance compensation member having substantially the same shape as the rectangular resistive member is deposited on either the inner surface of the first outer-conductor or the second outer-conductor so as to at least compensate for variation of the characteristic impedance produced when a high frequency current flows in the electrodes.
摘要:
A charging apparatus for electrostatically charging copying material in an electro-photographic copying machine includes a receptacle with its bottom plate fitted detachably and held in place by a spring. This receptacle holds a tungsten wire to produce a corona discharge and the wire can be easily replaced by removing the bottom plate.
摘要:
An impedance-matching resistor connected between two transmission paths of different characteristic impedances Zo and (Zo + Rg) by the use of a series-impedance Rg, in which the impedance-matching resistor is formed into a transmission line, such as a coaxial line or a strip line, and a characteristic impedance Zch of the transmission line is varied so as to meet with a condition (Zo + x/L .Rg) at a medium point spaced by a distance x from the input of one of said two transmission paths, the above mentioned one of the two transmission paths having the characteristic impedance Zo.
摘要翻译:阻抗匹配电阻器通过使用阻抗匹配电阻器形成为传输线的串联阻抗Rg(例如同轴线)连接在具有不同特性阻抗Zo和(Zo + Rg)的两个传输路径之间 或带状线,并且变化传输线的特性阻抗Zch,以便在与所述两个传输中的一个的输入间隔开距离x的中间点处满足条件(Zo + x / L.Rg) 上述两个具有特征阻抗Zo的传输路径之一。
摘要:
Apparatus constructing the potential gradient of a potential distribution on conductive paper or the like as measured by a plurality of linearly arranged probes. The probes are scanned so as to selectively apply the voltage between different probes to one input of an X-Y recorder while a synchronized voltage indicating the position of the probes being scanned is applied to another input of the X-Y recorder.
摘要:
A pulse-responsive drive apparatus comprising a first electromechanical energy converter responsive to one pulsating signal, a second electro-mechanical energy converter responsive to another pulsating signal, and a combined power transmission mechanism having inputs coupled to the respective mechanical outputs of the converters with the output of the transmission mechanism being the composite of said two mechanical outputs of the first and the second electro-mechanical energy converters respectively whereby an improvement of pulse response characteristics and an output variation are made possible.
摘要:
The tone of a point on a drawing is read out by a detector and the output of the detector is used to perform a judgment regarding the tracing of the pattern contour. The detector is moved to a predetermined point on a drawing in accordance with the result of judgment which is made by referring to the direction of previous tracing operation.
摘要:
An electrophotographic apparatus comprises supporting means for rotatably supporting a roll of paper, a mechanical system for advancing the paper through the apparatus, a roller rotatably mounted along the advancing path of the paper for eliminating the tendency of the paper to reroll; a cutting device for cutting the paper into separate sheets, and sensing means for sensing the consumption of the roll of paper. The supporting means comprises a rotatable shaft having a flange mounted on each end thereof for supporting therebetween the roll of paper. One end of the shaft is provided with a helical thread which cooperates with a pivotal lever on one flange to releasably and adjustably mount the flange on the shaft. A biasing spring urges the lever into engagement with the helical thread to releasably lock the flange on the shaft and the spring may be compressed by manually pivoting the lever against the spring force whereby the flange may be slid off of the shaft so that another roll of paper may be mounted thereon.
摘要:
A circuit for controlling an intensity of a scanning in an electromagnetic deflection type cathode ray tube generates an unblanking pulse only when a current change exists in a deflection coil of the cathode ray tube. The unblanking pulse is applied to an intensity modulation grid of the cathode ray tube thereby a fluorescent surface is maintained in an unblanking condition when the current change exists in a deflection coil and in a blanking condition when no current change exists in a deflection coil. As a result of this, an intensisty of a scanning can be in constant brightness independent of the scanning velocity and further, a burning of the fluorescent surface of the cathode ray tube can be prevented in case movement of a brightness spot is stopped.
摘要:
An automatic system for tracing a pattern depicted on a sheet of drawing comprises a detector operative to determine the presence or absence of the pattern to convert it into an electric signal, tracing direction detecting means responsive to the electric signal to judge whether the pattern is to be traced or not so as to provide a signal for moving the detector in the tracing direction, a driving mechanism responsive to the signal from the tracing direction detecting means to relatively move the detector in a predetermined direction by a predetermined distance and means to generate a digital signal corresponding to the tracing direction or a tracing spot, said detector detecting the information regarding the presence or absence of the pattern in an area close to the pattern to be traced thus continuously tracing the same.