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1. 发明专利

JPH02243906A PROBE FOR SCAN TYPE TUNNELING MICROSCOPE WITH AUXILIARY ELECTRODE 失效
公开(公告)号：JPH02243906A
公开(公告)日：1990-09-28
申请号：JP6355689
申请日：1989-03-17
申请人： NAKAGAWA APPLIED RES KK
发明人： NAKAGAWA HIDEMOTO
IPC分类号： G01B7/34 , G01N37/00 , G01Q60/10 , G01Q60/16 , H01J37/28
摘要： PURPOSE:To reduce measurement disturbance due to an adsorbed ion by providing >=1 auxiliary electrodes nearby the probe and controlling the electric field nearby the probe with a voltage applied to the auxiliary electrodes. CONSTITUTION:An auxiliary electrode 3 is provided at the periphery of the probe 1 through an insulator 2. Further, when the tip of the probe 1 is cleaned by electric field ion radiation, a pulsating voltage which is necessary for the electric field ion radiation is applied the probe 1 and electrode 3 in a vacuum state to dissocinate adsorbed ions with the electric field. Then when a leak current is reduced in an electrolytic solution, the same potential with the probe 1 is applied to the electrode 3 and then the leak current from the flank of the probe 1 to the solution is reduced greatly because the level of the leak current is proportional to the density of lines of electric force. Then if movable adsorbed ions are present on the surface of a sample 4 when a measurement is taken in an atmosphere, a large voltage having the opposite polarity from the adsorbed ions is applied to the electrode 3 and then no influence is exerted upon the measurement of a tunneling current at the tip of the probe 1.

2. 发明专利

JPH02206705A CHARGE INTEGRATION TYPE SCANNING TUNNELLING MICROSCOPE 失效
公开(公告)号：JPH02206705A
公开(公告)日：1990-08-16
申请号：JP2679389
申请日：1989-02-07
申请人： NAKAGAWA APPLIED RES KK
发明人： NAKAGAWA HIDEMOTO
IPC分类号： G01B7/34 , G01N23/00 , G01N37/00 , G01Q60/10 , G01Q60/12 , G01Q60/14 , G01Q60/24 , H01J37/28
摘要： PURPOSE:To analyze the physical and chemical characteristics of the surface of a sample by applying a bias voltage between a probe and the sample and charging a capacitor with a flowing weak current, and detecting the time variation of a terminal voltage as a current signal. CONSTITUTION:A parasitic capacitance capacitor 7 is annexed to an analog switch 4, and a component of a discharge pulse 16 applied to a discharge control terminal 8 is coupled with an output and becomes a noise, therefore, it is desirable to be as small as possible. In a linear amplification output waveform 18 shown in the figure, at the time of rise and at the time of fall of a discharge pulse 16, a whisker-like noise is seen due to this influence. A tunnelling current is obtained as a difference voltage at every prescribed time of an integration waveform, therefore, even if the discharge pulse 16 is coupled with the output, the accuracy of current measurement is not deteriorated directly. The current data is obtained as a discrete data of the period of A/D conversion, so that the frequency component of a current signal which can respond with this system is limited to the frequency of half or below of the reciprocal of a conversion period.

3. 发明专利

JPS63148724A TELEVISION IMAGE SIGNAL MULTIPLEX TRANSMISSION METHOD IN CATV SYSTEM 失效
公开(公告)号：JPS63148724A
公开(公告)日：1988-06-21
申请号：JP29471086
申请日：1986-12-12
申请人： KANTO DENKI KOJI , MIHARU COMMUNICATION , NAKAGAWA APPLIED RES KK
发明人： KATO TOSHIO , MITANI YOSHINORI , TAKASHIMA MASAJI , TAGAWA AKIRA , NAKAGAWA HIDEMOTO
IPC分类号： H04N7/22 , H04B10/00 , H04B10/548 , H04J1/00 , H04J14/00 , H04J14/02 , H04N7/16
摘要： PURPOSE:To reduce the influence of an external noise, and also, to improve the transmission quality by transmitting an FM-modulated television picture signal by using a single mode type optical fiber as a transmission line. CONSTITUTION:A video input signal is brought to an FM modulation by an FM video modulator 11, a voice IF input signal is brought to a frequency conversion by a frequency converter 12, and both of them are mixed and outputted as an RF signal. The RF signal is mixed by a 10 CH portion by a mixer 13 and becomes an optical signal by an E/O converter 14, and sent to a signal mode type optical fiber 1. Subsequently, an optical signal inputted to an O/E converting part 21 of an optical signal receiving part 20 is converted to an RF signal and allowed to branch by a branching filter 22, and also, divided into a picture signal and a sound signal, the picture signal is demodulated by an FM video demodulator 23, and the sound signal is brought to a frequency conversion by a frequency converter 24, and outputted as a video signal and a sound IF signal.

4. 发明专利

JPH0738531A WAVELENGTH MULTIPLEX ANALOG OPTICAL COMMUNICATION EQUIPMENT 失效
公开(公告)号：JPH0738531A
公开(公告)日：1995-02-07
申请号：JP35908091
申请日：1991-12-26
申请人： NAKAGAWA APPLIED RES KK , MIHARU COMMUNICATION , KANTO DENKI KOJI
发明人： ABE TOSHIRO , OTOMO MASAYUKI , NAKAGAWA HIDEMOTO , INOUE KAZUNARI , MASUDA SHINICHI
IPC分类号： H04J14/00 , H04J14/02
摘要： PURPOSE:To provide the wavelength multiplex communication system which can extend a transmission distance even when wavelength multiplexing is performed, makes high-quality signal transmission possible while reducing reflected return light and is practical in the aspect of allowable transmission loss and noise characteristics as well. CONSTITUTION:Concerning the wavelength multiplex analog optical communication equipment for which analog modulated optical signals from over two light sources can be transmitted/received through one optical fiber 1 to optical transmitters 2 and 3 and optical receives 4 and 5 at both the terminals, this equipment uses fused tapered equipments as an optical multiplexer/demultiplexer 6 to be inserted into the optical fiber 1, fused tapered optical multiplexer and fused tapered optical demultiplexer. Thus, the degradation in the linearity or peculiar noise characteristics of a semiconductor laser caused by the reflected return light is decreased and high-quality signal transmission is possible. A single core interactive communication system can be realized by an AM optical CATV system in a multi-channel direct modulation system with the small allowable loss of a transmission line and can be contributed to large scale and multiple channels.

5. 发明专利

JPS63148731A FM TRANSMISSION METHOD 失效
公开(公告)号：JPS63148731A
公开(公告)日：1988-06-21
申请号：JP29470986
申请日：1986-12-12
申请人： KANTO DENKI KOJI , MIHARU COMMUNICATION , NAKAGAWA APPLIED RES KK
发明人： MITANI YOSHINORI , TAKASHIMA MASAJI , TAGAWA AKIRA , NAKAGAWA HIDEMOTO
IPC分类号： H04B15/00
摘要： PURPOSE:To improve C/N in a receiving side by multiplying an FM modulated wave, widening a frequency deviation and sending it out, returning it to its original frequency deviation in the receiving side and demodulating it. CONSTITUTION:An FM modulated wave alpha is multiplied by an multiplying circuit 1 and a frequency deviation is widened by the share of multiplied number and sent out to a transmission line 2, and in a receiving side, noise is eliminated by a limiter 3, etc., and thereafter, it is returned to its original frequency deviation by a frequency divider 4 with a frequency dividing ratio of a share multiplied in a transmitting side, and demodulated by a general demodulator. In this regard, if a demodulator of the receiving side can demodulate of the FM demodulated wave of a wide frequency deviation, it is also possible to demodulate without dividing a frequency by the frequency divider 4.

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