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1. 发明专利

JPH0266400A GAS EXCHANGER DEVICE 失效
公开(公告)号：JPH0266400A
公开(公告)日：1990-03-06
申请号：JP21639788
申请日：1988-09-01
申请人： FUJITSU LTD , EBARA CORP
发明人： SADAKATA TAKAYUKI , FUJIE NOBUO , NISHIMURA TATSUYA , SAITO MASAO , HIROSE TETSUHISA
IPC分类号： F17D1/04
摘要： PURPOSE:To perform gas exchange work in piping safely and in good efficiency further in a short time by providing a portable type exhaust device, portable tape inactive gas supplier device and a control unit, which controls the action of the inactive gas supplier device from a side of the exhaust device, further in the exhaust device. CONSTITUTION:In the case of replacing semiconductor manufacturing gas residual in a piping system with inactive gas, first an exhaust device 14 and an inactive gas supplier device 12 are connected respectively to a side of a semiconductor manufacturing device 4 and a semiconductor manufacturing gas bomb 2 in the piping system for gas exchange to be performed, and air in these devices is replaced with inactive gas. Exhaust in the piping system 5 is performed by the exhaust device 14, and in the point of time a pressure in the piping system 5 decreases to a predetermined value or less, exhaust operation is finished. Subsequently, supply operation of inactive gas is performed by the inactive gas supplier device 12 till the pressure in the piping system 5 increases to a predetermined value or more. And the exhaust and supply operations are repeated by a preset number of times by a control unit.

2. 发明专利

JPH0784161A LASER DIODE MODULE 失效
公开(公告)号：JPH0784161A
公开(公告)日：1995-03-31
申请号：JP22628493
申请日：1993-09-13
申请人： FUJITSU LTD
发明人： NISHIMURA TATSUYA
IPC分类号： G02B6/42 , G02B27/28 , H01S5/00 , H01S3/18
摘要： PURPOSE:To improve an extinction ratio in light output at the time of inputting of pulse signals by making the output light of a laser diode incident on a polarization separating element and introducing the exit light of the polarization separating element to an optical fiber. CONSTITUTION:The transmission loss of a laser oscillation region is lessened if the light of the laser oscillation region is previously aligned to p polarized light at the time of making the output light of the laser diode 4 incident at a Brewster angle on dielectric laminated films 1. Only the specific polarized light of the light of a spontaneously release region of randomly polarized light passes the region and, therefore, the transmission loss is increased. The transmitted light is emitted in a direction of the Brewster angle on the basis of the perpendicular erected on the plane of the dielectric laminated films 1. The light of the laser oscillation region is efficiently coupled to the optical fiber 3 if the direction is aligned to the direction of the optical fiber 3. The spontaneously released light of the light past the dielectric laminated films 1 is attenuated in such a manner and, therefore, the light output signal having the good extinction ratio characteristic is obtd.

3. 发明专利

JPH0955705A OPTICAL COMMUNICATION MODULE 失效
公开(公告)号：JPH0955705A
公开(公告)日：1997-02-25
申请号：JP20425295
申请日：1995-08-10
申请人： FUJITSU LTD
发明人： ISHIKAWA TOMOHISA , HAKOMORI KATSUHIKO , NISHIMURA TATSUYA
IPC分类号： H04B10/40 , H01S5/068 , H04B10/079 , H04B10/272 , H04B10/50 , H04B10/564 , H04B10/60 , H04B10/67 , H04B10/69 , H04B10/28 , H01S3/133 , H04B10/02
摘要： PROBLEM TO BE SOLVED: To provide an optical communication module which simplifies a TCM communication device. SOLUTION: A driving part 12A is constituted having a laser diode driving circuit 30A which drives a laser diode 18 and outputs a transmission state display signal indicating a transmission state, an automatic output control circuit 31 which controls the driving current of the laser diode driving circuit 30A so that the output power of the light signal outputted by the laser diode becomes constant, an automatic gain control circuit 34 which holds the level of a received signal constant, a switching circuit 36A which performs time-division switching between transmission and reception so that the control of the automatic output control circuit 31 is performed and the control of the automatic gain control circuit 34 is stopped at the time of the transmission while the control of the automatic output control circuit 31 is stopped and the control of the automatic gain control circuit 34 is performed at the time of the reception, and a switching signal generating circuit 50 which is supplied with the transmission state display signal to generate a switching signal and supplies the switching signal to the switching circuit 36A.

4. 发明专利

JPH08223228A EQUALIZATION AMPLIFIER AND RECEIVER AND PREAMPLIFIER USING SAME 失效
公开(公告)号：JPH08223228A
公开(公告)日：1996-08-30
申请号：JP5387595
申请日：1995-03-14
申请人： FUJITSU LTD
发明人： KOGURE KAZUHISA , OSADA HIROKAZU , TANAKA YASUHIRO , KITASAGAMI HIROO , MIYOSHI MAKOTO , INOUE SATOSHI , IKEGAMI TAKAYOSHI , KOBAYASHI KENICHI , SANO SHINICHIRO , MISAIZU SETSUO , YAMASHITA MASAHIKO , NISHIMURA TATSUYA
IPC分类号： H03G3/20 , H03F3/08 , H03F3/34 , H03F3/45 , H03G3/30 , H04B3/04 , H04B10/07 , H04B10/2507 , H04B10/293 , H04B10/294 , H04B10/299 , H04B10/564 , H04B10/572 , H04L25/03 , H04B10/04 , H04B10/06 , H04B10/14
摘要： PURPOSE: To obtain an equalizer amplifier whose reference voltage is kept to the center level of a signal and succeeding identification is normally conducted even when a pulse width fluctuates in the preamplifier. CONSTITUTION: The equalizer amplifier converting an optical signal from an optical transmission line into an electric signal, amplifying it to be a reception signal and applying equalizer amplification to the reception signal has an AGC circuit 3 amplifying the reception signal and providing an output of 1st and 2nd signals being complementary signals and an offset compensation circuit 4 generating a 1st difference signal based on a difference between the 1st and 2nd signals, comparing the 1st difference signal with a 1st reference voltage and providing an output of the error as a reference signal to the AGC circuit 3. Then the reference voltage is changed to be set nearly to the center of the amplitude of the reception signal thereby compensating an offset of the AGC circuit 3.

5. 发明专利

JPH06252425A PHOTODIODE MODULE 失效
公开(公告)号：JPH06252425A
公开(公告)日：1994-09-09
申请号：JP3549693
申请日：1993-02-24
申请人： FUJITSU LTD
发明人： NISHIMURA TATSUYA , MIYATA SADAYUKI
IPC分类号： H01L31/02 , G02B6/42 , H01L31/0232 , H01L31/10
摘要： PURPOSE:To make it possible to display the self-compressing function of a dynamic range by a method wherein the title photodiode module is constituted in such a manner that it has a photodiode and a photoconductive cell, and an input signal is optically coupled to both elements. CONSTITUTION:An optical signal passed through a lens 2 from an optical fiber 1 is branched on a dielectric multilayer film 7, one of the branched beams is made incident to a photodiode 5, and the other beam is made incident on a photoconductive cell 8. Accordingly, the output of the photodiode 5 becomes large against a strong signal light, but as the resistance of the photoconductive cell 8 decreased, the impact to an amplifier 8 can be adjusted to make small. As a result, the self-compressing function of a dynamic range can be displayed.

6. 发明专利

JPH02303514A EVACUATING APPARATUS 失效
公开(公告)号：JPH02303514A
公开(公告)日：1990-12-17
申请号：JP12443989
申请日：1989-05-19
申请人： EBARA CORP , FUJITSU LTD
发明人： NISHIMURA TATSUYA , SADAKATA TAKAYUKI , FUJIE NOBUO
IPC分类号： A47L9/02 , B01D53/04 , B01D53/34 , B01D53/81 , B01L1/00 , F24F7/06
摘要： PURPOSE:To effectively prevent the diffusion of a produced gas and to improve the sanitation of working environment by providing a gas treating means with a dry type adsorbent and constituting the gas treating means freely attachable and detachable to and from a moving means. CONSTITUTION:A fan 32 to suck the gas, the gas treating means 20 which treats the sucked gas and a detecting means which detects, the concn. of the gas are imposed on a moving means 10. The gas treating means 20 is provided with the dry type adsorbent 28 and the means 20 is constituted freely attachable and detachable to and from the moving means 10. As a result, the local diffusion of the produced gas is effectively prevented as the device is of a moving type. In addition, the sanitation of the working environment is improved.

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