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121. 发明专利

JPH0616713B2 失效
公开(公告)号：JPH0616713B2
公开(公告)日：1994-03-09
申请号：JP13183882
申请日：1982-07-28
申请人： AJINOMOTO KK
发明人： MIWA KYOSHI , TERABE MASATO , ITO KOICHI , ISHIDA MASAAKI , MATSUI KAZUHIKO , NAKAMORI SHIGERU , SANO TAKANOSUKE
IPC分类号： C12N15/09 , C07H21/04 , C12N1/21 , C12N15/00 , C12N15/77 , C12P13/22 , C12R1/13 , C12R1/15

122. 发明专利

JPH05335667A 失效
公开(公告)号：JPH05335667A
公开(公告)日：1993-12-17
申请号：JP14186292
申请日：1992-06-03
申请人： RICOH KK
发明人： ISHIDA MASAAKI
IPC分类号： H01S5/042 , H01S5/0683 , H01S3/096
摘要： PURPOSE:To always obtain a desired light waveform even when an optical/electrical negative feedback loop is operated at a high speed by providing a frequency characteristic compensation circuit which compensates the frequency characteristics of a light receiving section in a control system using the optical/electrical negative feedback loop. CONSTITUTION:This circuit of a laser printer is provided with an optical/electrical negative feedback loop which controls the forward current of a semiconductor laser 2 so that a light receiving signal proportional to the optical output of the laser 2 obtained from a light receiving section 3 and a light emitting level commanding signal can become equal to each other. In addition, the title circuit is also provided with a conversion circuit 6 which converts a light level commanding signal into the forward current of the laser 2 based on the optical output/forward current characteristic of the laser 2, the coupling coefficient of the section 3 and the high output of the laser, and the optical input/light receiving signal characteristic of the section 3. A frequency characteristic compensation circuit 7 which compensates the frequency characteristics of the section 3 is provided so that a desired light waveform can be obtained in accordance with the light emitting level commanding signal.

123. 发明专利

JPH05129705A SEMICONDUCTOR LASER DRIVING CONTROL CIRCUIT 失效
公开(公告)号：JPH05129705A
公开(公告)日：1993-05-25
申请号：JP29265691
申请日：1991-11-08
申请人： RICOH KK
发明人： TAKEYAMA YOSHINOBU , EMA HIDETOSHI , ISHIDA MASAAKI
IPC分类号： B41J2/44 , G03G15/04 , G11B7/125 , H01S5/068
摘要： PURPOSE:To decrease the control current of a light/electricity negative feedback loop to the minimum value, and to secure high speed modulation characteristics by a method wherein a semiconductor laser is driven and controlled by the total current of the control current of the light/electricity negative feedback loop and the current generated by a current converter. CONSTITUTION:The light emission signal of a light receiving element 4 and a light emission level instruction signal are compared by a comparison amplifier 1, and the forward current of a semiconductor laser 3 is controlled in such a manner that a light receiving signal and a light emission level instruction signal are made equal. Also, a current converter 2 outputs the preset current (current set in advance based on the light output and forward current characteristics of the semiconductor laser 3, the coupling coefficient of a light receiving element 4 and the light output of the semiconductor laser 3, and the light input and forward current characteristics of the light receiving element 4) in accordance with the above-mentioned light emission instruction signal so that the light receiving signal and the light emission instruction signal are made equal. The total current of the output current of the current converter 2 and the control current outputted from the comparison amplifier 1 forms the semiconductor laser 3's forward current to be controlled.

124. 发明专利

JPH0575199A SEMICONDUCTOR LASER CONTROL APPARATUS 失效
公开(公告)号：JPH0575199A
公开(公告)日：1993-03-26
申请号：JP2462292
申请日：1992-01-14
申请人： RICOH KK
发明人： EMA HIDETOSHI , ISHIDA MASAAKI
IPC分类号： G11B7/1263 , G11B7/1267 , H01S5/00 , H01S5/068 , H04B10/07 , H04B10/293 , H04B10/564 , H04B10/572
摘要： PURPOSE:To facilitate design of an optical-electrical load feedback loop and to enable high-speed control by using bipolar transistors to make circuits integrated in a semiconductor laser control apparatus which controls so that a monitor signal proportional to the output light intensity of a semiconductor laser may be equal to an emission command signal. CONSTITUTION:An optical-electrical feedback loop I amplifies a differential current between an emission command signal and a monitor signal by an error current amplifier 13 and controls the forward current of a semiconductor laser LD. An automatic setting circuit III automatically sets the conversion rate of converting the emission command signal into the drive current of the semiconductor laser LD. A drive circuit II drives the semiconductor laser LD so as to attain an optical level corresponding to emission command signals independently of the optical-electrical load feedback loop I. Therefore, the controlled variable of the optical-electrical feedback loop decreases to improve high-speed modulation characteristics.

125. 发明专利

JPH04347641A METHOD OF DETECTING IMPROPER PAPER FEEDING IN SHEET-FEED PRESS 失效
公开(公告)号：JPH04347641A
公开(公告)日：1992-12-02
申请号：JP14813291
申请日：1991-05-24
申请人： KOMORI PRINTING MACH
发明人： ISHIDA MASAAKI
IPC分类号： B41F33/14
摘要： PURPOSE:To provide a method for detecting feeding of wrong paper sheets which makes it possible to reduce the wrong paper sheets to be supplied between printing cylinders of printing units to minimum. CONSTITUTION:There are provided wrong paper feeding detectors 24, 25, 26, 27, 28 which detect whether or not a wrong paper sheet is supplied and generated a detecting signal. When the wrong paper feeding detectors do not detect the wrong paper sheet feeding, printing is continued as the cylinders are set. If the detectors detect the wrong paper sheet feeding, all the printing cylinders of the printing units are simultaneously turned into the detached state, thereby stopping printing.

126. 发明专利

JPH04227370A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH04227370A
公开(公告)日：1992-08-17
申请号：JP13587491
申请日：1991-05-09
申请人： RICOH KK
发明人： EMA HIDETOSHI , HATTORI HITOSHI , ISHIDA MASAAKI , IMAGAWA SUSUMU , TAKEYAMA YOSHINOBU
IPC分类号： B41J2/44 , G03G15/04 , H01S5/068 , H04N1/40 , H04N1/405
摘要： PURPOSE:To realize a high definition picture and also to realize a stable high definition heat tone picture by solving problems in the pulse width modulation system and in the light intensity modulation so ad to employ a laser printer resulting from the combination of the laser scanning technology and the electrophotographic technology. CONSTITUTION:The image forming device is provided with a 1st means 11 setting a pulse width not causing 100% of the exposure time corresponding to a minimum picture element to be recorded and varying the exposed light quantity according to each inputted picture element information, a 2nd means 10 converting the inputted picture element information into picture element information of predetermined MXN sets of patterns based on the MXN sets of picture element information inputted as above, and a 3rd means (selection calculation means) selecting the 1st or 2nd means according to the picture information inputted as above.

127. 发明专利

JPH04221871A SEMICONDUCTOR LASER CONTROLLER 失效
公开(公告)号：JPH04221871A
公开(公告)日：1992-08-12
申请号：JP41349890
申请日：1990-12-21
申请人： RICOH KK
发明人： ISHIDA MASAAKI , EMA HIDETOSHI
IPC分类号： G03B27/72 , G11B7/125 , H01S5/042
摘要： PURPOSE:To stabilize the control speed of an optoelectric negative feedback loop accurately at a high speed with high resolution. CONSTITUTION:A light emitting level command signal current is transmitted from the drain of a field effect transistor 3 to an amplifying stage made of a transistor 5 through a voltage shifter 4 by a current amplifier of an optoelectric negative feedback loop.

128. 发明专利

JPH04167860A SEMICONDUCTOR LASER CONTROLLER 失效
公开(公告)号：JPH04167860A
公开(公告)日：1992-06-15
申请号：JP29421890
申请日：1990-10-31
申请人： RICOH KK
发明人： ISHIDA MASAAKI , EMA HIDETOSHI
IPC分类号： B41J2/44 , G11B7/1263 , G11B7/1267 , H01S5/068 , H04B10/07 , H04B10/293 , H04B10/564 , H04B10/572 , H04N1/04 , H04N1/113
摘要： PURPOSE:To obtain the controller at high speed with high resolution, low power consumption at a low cost by using a current amplifier section of an opto- electric negative feedback loop so as to send a signal via a voltage shift circuit such as an emitter follower thereby adopting a low power supply voltage. CONSTITUTION:An optical output of a semiconductor laser 1 is detected by a light receiving element 2, an obtained light receiving signal current and a light emission level command signal current are inputted to a current summing point 9 and amplified, an output current is fed to the laser 1 as a forward current to stimulate the laser. A light emission level command signal is fed to a gate of a field effect transistor 3 in the current amplifier section via the point 9, the current is amplified by the TR 3 and a bipolar TR 5 and its output is fed back negatively to the gate of the TR 3 via a capacitor 6. A base voltage of the TR 5 is shifted to a voltage lower than the drain voltage of the TR 3. The element 2 detects part of an optical output of the laser 1 to generate a current proportional to the light output of the laser 1 and the current is added to the command signal at the point 9, the sum is fed back negatively and the forward current is controlled so that the light receiving signal and the command signal are equal to each other.

129. 发明专利

JPH04109687A SEMICONDUCTOR LASER CONTROL DEVICE 失效
公开(公告)号：JPH04109687A
公开(公告)日：1992-04-10
申请号：JP22900490
申请日：1990-08-30
申请人： RICOH KK
发明人： ISHIDA MASAAKI , EMA HIDETOSHI
IPC分类号： H01S5/068 , H01S5/00 , H01S5/0683
摘要： PURPOSE:To realize high accuracy, high speed operation and high resolution by adjusting the gain of a gain converter and setting the light output of a semiconductor laser. CONSTITUTION:A current amplifying part is structured by inputting a drain of a field effect transistor 7 to a base of a bipolar transistor 10, inputting a collector of the bipolar transistor 10 to a cathode of a semiconductor laser 9 and connecting an emitter of the bipolar transistor 10 to a gate of the field effect transistor 7 through a capacitor 8. A light receiving signal current from a light receiving part 12 is branched to a reference voltage 15 and a current input for feedback using a variable resistor 13, and a control signal for setting the reference voltage 15 and the current input point to the same voltage is then applied to a current input point. Thereby, high accuracy, high speed operation and high resolution can be realized only with a simple circuit structure.

130. 发明专利

JPS63237793A PRODUCTION OF L-THREONINE 失效
公开(公告)号：JPS63237793A
公开(公告)日：1988-10-04
申请号：JP7252787
申请日：1987-03-26
申请人： AJINOMOTO KK
发明人： ISHIDA MASAAKI , KONISHI ERIKO , MAKIHARA REIKO , AKASHI KUNIHIKO , TSUCHIDA TAKAYASU , NAKAMORI SHIGERU
IPC分类号： C12P13/08 , C12N15/00 , C12N15/52 , C12R1/15
摘要： PURPOSE:To permit high-efficient production of L-threonine by culturing a Corynebacterium microorganism bearing a plasmid which is obtained by integrating a gene for threonine synthesis originating from the chromosome of Corynebacterium into the vector originating from Corynebacterium. CONSTITUTION:A Corynebacterium microorganism is prepared by integrating a gene for threonine synthesis, originating from the chromosome of Escherichia or Corynebacterium, into a vector from Corynebacterium. The microorganism bearing the recombined plasmid is aerobically cultured in a medium containing carbon source, nitrogen source, inorganic ions and so on an L-threonine is collected from the culture mixture. As a vector to be used, are cited self-vectors such as pAJ223, pAJ224 or pAJ225. The Escherichia as a source of the chromosome is, for example, Escherichia coli K-12.

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