摘要:
A first mixer circuit mixes a first center frequency signal with a first local oscillation signal to generate a second mixed signal, and mixes the first center frequency signal with a second local oscillation signal to generate a first mixed signal, and a second mixer circuit mixes a second center frequency signal with the first local oscillation signal to generate a fourth mixed signal, and mixes the second center frequency signal with the second local oscillation signal to generate a third mixed signal. An adder and subtracter circuit subtracts the third mixed signal from the second mixed signal to output a signal of subtraction result as a first upper side band signal, and adds the first mixed signal to the fourth mixed signal to output a signal of addition result as a second upper side band signal different in phase from the first upper side band signal by 90 degrees.
摘要:
A first mixer circuit mixes a first center frequency signal with a first local oscillation signal to generate a second mixed signal, and mixes the first center frequency signal with a second local oscillation signal to generate a first mixed signal, and a second mixer circuit mixes a second center frequency signal with the first local oscillation signal to generate a fourth mixed signal, and mixes the second center frequency signal with the second local oscillation signal to generate a third mixed signal. An adder and subtracter circuit subtracts the third mixed signal from the second mixed signal to output a signal of subtraction result as a first upper side band signal, and adds the first mixed signal to the fourth mixed signal to output a signal of addition result as a second upper side band signal different in phase from the first upper side band signal by 90 degrees.
摘要:
In a high frequency oscillator circuit including first and second field effect transistors, the first field effect transistor has a gate connected to a short-stub transmission line and a drain connected to an oscillation output terminal, and the second field effect transistor has a drain connected to a source of the first field effect transistor and a grounded source. The high frequency oscillator circuit oscillates by using a feedback circuit including the short-stub transmission line and the second field effect transistor. A feedback capacitor is further provided which is connected between a gate of the second field effect transistor and the drain of the first field effect transistor.
摘要:
In a high frequency oscillator circuit including first and second field effect transistors, the first field effect transistor has a gate connected to a short-stub transmission line and a drain connected to an oscillation output terminal, and the second field effect transistor has a drain connected to a source of the first field effect transistor and a grounded source. The high frequency oscillator circuit oscillates by using a feedback circuit including the short-stub transmission line and the second field effect transistor. A feedback capacitor is further provided which is connected between a gate of the second field effect transistor and the drain of the first field effect transistor.
摘要:
An ink jet printer ejects ink droplets of a plurality of sizes based on image data, and prints dots of a plurality of sizes corresponding to the ink droplets of the plurality of sizes for recording the image. In the ink jet printer, in order to print a smoothing dot close to a normal dot, pulse voltage having a waveform having its printing timing changed from a waveform for printing the normal dot is applied to a piezoelectric element. As a result, an ink jet printer capable of recording high definition images can be provided.
摘要:
An ink jet printer is adapted to drive a piezoelectric element by applying pulse voltage having waveforms of A1-A8 based on image data, fly ink drops respectively having sizes corresponding to waveforms A1-A8 of the pulse voltage, and record an image on a recording sheet. In the ink jet printer, a rise rate of pulse voltage having waveforms A1-A3 corresponding to ink drops of relatively small sizes is set such that the rise rate is high compared with that of pulse voltage having waveforms A4-A8.
摘要:
A fixing device includes a heater and a fixing belt entrained around first and second supporting rollers. A pressure roller is arranged outside the belt. Also, an elastic forcing member is arranged inside the belt to force a portion of the belt running between the two supporting rollers against the pressure roller so that the belt portion is brought into circumferential contact with the pressure roller to form an extended nipping region. In addition, a braking device connected to an upstream support roller stretches the belt at the nip region. With this arrangement enough amount of heat is supplied to a recording medium and toner image flattening is prevented.
摘要:
This invention concerns a fundus camera which can take photographs other than by fluorescence or by fluorescence. An optical device is withdrawn from the optical path of a photographic system at the same time as a barrier filter for taking photographs by fluorescence is inserted and is inserted in the optical path of the photographic system for observation purposes at the same time as the barrier filter is removed. The optical device has the same optical path length as the barrier filter, and thus a focused fundus image attained during observation is not upset when fluorescent photographs are taken.
摘要:
The present invention relates to method and apparatus for processing a fused toner image onto paper by using toner having a predetermined mean particle size and paper having a specialized surface roughness so as to improve the fused strength of the toner and image quality.
摘要:
This invention relates to a two-components developer containing toners and carriers wherein the toners have spheroidicity of 150 or less, mean particle size of 14 .mu.m or less and coefficient of variation of 15% or less, and the carriers have mean particle size of between 20 .mu.m and 70 .mu.m and/or spheroidicity of 140 or more.