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1. 发明专利

JP2000037902A PRINTING SYSTEM 失效
公开(公告)号：JP2000037902A
公开(公告)日：2000-02-08
申请号：JP20607898
申请日：1998-07-22
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： KOBAYASHI SHINYA , OSHIMA MINORU
IPC分类号： B41J2/44 , H04N1/387
摘要： PROBLEM TO BE SOLVED: To judge the attribute of a dot without mistake so as to replace an appropriate high resolution video signal by detecting attribute information of a pixel to be recorded from printing data and replacing to a low resolution video signal based on the attribute information. SOLUTION: A command scan program 101 inspects printing data 211 for one page stored in a printing data memory 206 for picking up the information related to commands concerning a character, a graphic, and an image. Since they are simple text data in the printing data 211, they can be found out easily by scanning the printing data 211 by the command scan program 101. Next, the printing data 211 are developed by a data developing program 103 so as to be image data 212 for one page and stored in an image data memory 207. Accordingly, since judgment is made with the accurate attribution information extracted from the printing data added, image deterioration due to misjudgment can be prevented.

2. 发明专利

JPH11202577A ELECTROPHOTOGRAPHIC PRINTER 失效
公开(公告)号：JPH11202577A
公开(公告)日：1999-07-30
申请号：JP533598
申请日：1998-01-14
申请人： HITACHI KOKI KK
发明人： NAKAZAWA TAKASHI , OSHIMA MINORU , ONO KATSUHIRO , KONO SACHIKAZU
IPC分类号： G03G21/14 , B65H37/04 , G03G15/00
摘要： PROBLEM TO BE SOLVED: To realize the highest speed processing in an individual printing and binding system regardless of a difference between the printing processing time of a printer and the binding processing time of a binding device in a printing and binding system. SOLUTION: This electrophotographic printer 102 connecting the binding device 103 on line is provided with a time setting means 108 setting time being the set time exceeding the difference between the printing processing time and the binding processing time. The set time is varied according to a command from a control panel 104 or a host 101, and the time setting means is started from feeding the final paper of a booklet and the next printing of the booklet is started after the set time elapses.

3. 发明专利

JPH0477768A ELECTROSTATIC RECORDER 失效
公开(公告)号：JPH0477768A
公开(公告)日：1992-03-11
申请号：JP19053090
申请日：1990-07-20
申请人： HITACHI KOKI KK , HITACHI LTD
发明人： NAKAZAWA TAKASHI , OSHIMA MINORU , ISHIKAWA MASAMI , OGAWA TSUKASA , UMEDA TAKAO , MIYASAKA TORU
IPC分类号： G03G15/02 , G03G15/00
摘要： PURPOSE:To correct the measured error of potential caused by mechanical level difference between a photosensitive body and a reference potential part and to accurately control the potential of the photosensitive body by providing a circuit which generates the correcting amount of an error and an addition circuit and obtaining such constitution that an error correction signal is added and subtracted to and from a potential detection signal on the circuit. CONSTITUTION:Since the reference potential part 2 and the photosensitive body 3 are discontinuous, the level difference G is generated. A correction circuit consists of an adder 11 being an addition means and a switch 22 being a correction signal generation means. Then, a binary value ds-dse in proportion to a detection error Es-Ese by the level difference G shown by a signal (j) is previously set by the switch and added to binary data des-dp for adding by the adder. The added result becomes the binary value ds-dp in proportion to the difference of the potential Vs-VP like a signal (k) and the effect of the level difference G is corrected.

4. 发明专利

JPH03215721A CONTACTLESS TYPE THERMOMETER CIRCUIT FOR CENTRIFUGAL MACHINE 失效
公开(公告)号：JPH03215721A
公开(公告)日：1991-09-20
申请号：JP1107990
申请日：1990-01-19
申请人： HITACHI KOKI KK
发明人： NAKAZAWA TAKASHI , AZUMA SHINJI , OSHIMA MINORU , KONNO TATSUYA
IPC分类号： G01J5/14 , B04B15/00
摘要： PURPOSE:To remove noise superposed upon a sensor signal and to improve temperature measurement accuracy by picking up a signal out of a sensor to a differential amplifier circuit through a balanced signal line. CONSTITUTION:A rotor 11 is rotated fast by a motor 13 in a rotor chamber 16 while cooled by an evaporator 15. A sensor substrate 6 is provided on the dress cover 8 of a bracket 10 across a spacer A7, a thermocouple type infrared temperature sensor 1 which measures the temperature of the rotor 11 is provided on the sensor substrate 6 at a specific position opposite to the rotor 11, and the sensor output is connected to the differential amplifier circuit 5 through the two-core shield line 2. This constitution removes external noises by the shield effect of the two-core shield line 2 and also remove noise which are in-phase components by a differential amplifier 4, which amplifies only the fine signal of the thermocouple type infrared temperature sensor 1 as a differential component to obtain a stable signal output. Consequently, the noise which are superposed upon the sensor signal are removed to improve the temperature measurement accuracy.

5. 发明专利

JPH08288915A METHOD FOR DETECTING RECEPTION SENSITIVITY OF RADIO EQUIPMENT AND RADIO COMMUNICATION SYSTEM USING THE METHOD 失效
公开(公告)号：JPH08288915A
公开(公告)日：1996-11-01
申请号：JP8923995
申请日：1995-04-14
申请人： HITACHI KOKI KK
发明人： NAKAZAWA TAKASHI , OSHIMA MINORU , KUBO KAZUYUKI , KATABAMI SHINICHI
IPC分类号： H04B17/00 , H04B7/26 , H04B17/309 , H04W24/06 , H04W28/04 , H04W52/02 , H04W88/02
摘要： PURPOSE: To select a best reception path automatically by repeating transmission while stepping down a transmission power sequentially every time a transmission interval timer expires and detecting a communication error from the expiration of a reception monitor timer. CONSTITUTION: A unit A14 sends a start command signal to detect a reception sensitivity to start a reception monitor timer. On the other hand, upon the receipt of the start command signal, a radio unit B15 uses a transmission power variable section 6 to send a signal SM representing a maximum power while keeping a maximum transmission power PM to start a transmission interval timer. The unit B15 steps down the transmission power sequentially every time the transmission interval timer expires, sends the signal corresponding to the prescribed transmission power and starts repetitively the transmission interval timer. The unit A14 detects a communication error and recognizes the reception sensitivity required for the communication with the radio unit B15 based on the signal stored just before the occurrence of the communication error, then the best reception path is automatically selected.

6. 发明专利

JPH03259166A MEASURING CIRCUIT FOR SURFACE POTENTIAL OF PHOTOSENSITIVE DRUM OF ELECTRONIC PRINTER 失效
公开(公告)号：JPH03259166A
公开(公告)日：1991-11-19
申请号：JP5638290
申请日：1990-03-09
申请人： HITACHI KOKI KK , HITACHI LTD
发明人： NAKAZAWA TAKASHI , OSHIMA MINORU , ISHIKAWA MASAMI , OGAWA TSUKASA , UMEDA TAKAO , MIYASAKA TORU
IPC分类号： G01R19/04 , G01R29/12 , G03G15/00
摘要： PURPOSE:To detect the wear of the photosensitive drum with a small error by providing a peak hold circuit which detects and holds the peak value of the signal generated by rectifying a detection signal. CONSTITUTION:A rectifying circuit 7 outputs a signal nu7 in synchronism with the signal nu5 of a driving circuit 5. The amplitudes A1 and A2 of the signal nu7 correspond to the potentials of the photosensitive body 3 and a reference potential part 2 and when a timing circuit 10 sends a timing signal nu10 to a peak hold circuit 8 so as to detect the amplitudes A1 and A2, the peak holding circuit 8 outputs a signal nu8, which is held by detecting the 1st peak of the signal nu7 arriving after the timing signal nu10 is generated. Consequently, the potentials of the photosensitive body 3 of the photosensitive drum and reference potential part 2 of the electronic printer are detected with a small ripple and the degree of deterioration of the photosensitive drum can be detected with a small error.

7. 发明专利

JPH02238962A PRINT DOT PITCH SWITCHING METHOD FOR PLURAL BEAM SCAN LASER PRINTER 失效
公开(公告)号：JPH02238962A
公开(公告)日：1990-09-21
申请号：JP5771889
申请日：1989-03-13
申请人： HITACHI KOKI KK , HITACHI LTD
发明人： OSHIMA MINORU , NAMIKAWA OSAMU , TSUJI HOKYO , SAITO SUSUMU , ARIMOTO AKIRA
IPC分类号： B41J2/44 , G02B26/10 , G03G15/04 , H04N1/04 , H04N1/113 , H04N1/23
摘要： PURPOSE:To enable switching of print dot pitch while fixing the beam pitch by setting the beam pitch in two beam scanning to be odd times of the print dot pitch. CONSTITUTION:When printing is carried out with 60% reduced print dot pitch, the beam pitch 12 of laser lines A24 and B25 is set to be same as that prevailing before reduction of pitch while the reduction print dot pitch 31 is set to 1/5 of the beam pitch 12. Scan time T to be determined by the circumferential rotary speed VD of a print drum 8 and the rotation of a rotary mirror 6 is controlled, by means of a rotary controller 16, such that the scan beam pitch P' will be 2/5 of the beam pitch 12. Reduction factor can be set freely by selecting it from a series of odd numbers 1, 3, 5, 7... and the print dot pitch 22 can be switched by switching the circumferential rotary speed VD of the print drum 8 and the scan time T of the rotary mirror 6.

8. 发明专利

JPH02109069A SCANNING OPTICAL SYSTEM FOR ELECTROPHOTOGRAPHIC DEVICE 失效
公开(公告)号：JPH02109069A
公开(公告)日：1990-04-20
申请号：JP26150388
申请日：1988-10-19
申请人： HITACHI KOKI KK , HITACHI LTD
发明人： OBARA KAZUTOSHI , NAMIKAWA OSAMU , TSUJI YASUYUKI , MORIO SHUICHI , OSHIMA MINORU , SAITO SUSUMU , ARIMOTO AKIRA
IPC分类号： G02B26/10 , B41J2/44 , G03G15/04
摘要： PURPOSE:To eliminate the misalignment for a printing start by calibrating a signal transfer time difference between each signal line caused by a propagation delay by a delaying circuit provided on each printing signal line and adjusting the transfer time, in a laser beam printer using plural light sources. CONSTITUTION:When a beam detector 7 is scanned by a laser light, a reference signal from the detector 7 is received by a control device 1, and a printing signal A and a printing signal B are sent out simultaneously to a signal line 9 and 10, respectively. In this case, the signal A and B generate a time difference (t) by a propagation delay of the respective signal lines, but allowed to reach as they are a delaying circuit 2 and 3, respectively. In this case, when the delaying circuit is set in advance so that the quicker signal is delayed by the time difference (t), the time difference between each signal is negated by passing through the delaying circuit, and the signals are sent out simultaneously to signal lines C, D again. Accordingly, laser devices 4, 5 are driven simultaneously, and laser beams 13, 14 are also emitted simultaneously. In such a way, the misalignment for a printing start on the surface of a drum 8 is eliminated.

9. 发明专利

JPH10268601A IMAGE RECORDER 失效
公开(公告)号：JPH10268601A
公开(公告)日：1998-10-09
申请号：JP7305397
申请日：1997-03-26
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： OTSUKA HIDEFUMI , OBATA SHIGERU , FUKUDA HIROMITSU , FURUYA YUJI , OSHIMA MINORU
IPC分类号： G03G21/00 , B65H5/02 , G03G15/00
摘要： PROBLEM TO BE SOLVED: To reduce the fluctuation of driving force caused by an image forming member forming images onto a belt, by forming both end sides of the pressing member of a belt rear side face outside than the width of the body to be recorded out of a member having a hardness higher than that at the center part, and transmitting constant driving force to the belt from the image forming member. SOLUTION: An endless belt 1081 is streched over four rollers including a pressing roller 1085 at a transfer belt unit 108, and the outer peripheral side of a core bar is covered with a rubber material or a sponge material at the pressing roller 1085. Then, both end sides abutting on the outside of the width of the body to be recorded 1 carried are constituted of end side roller parts formed of the rubber material for instance such as EPDM, and a part abutting on the carrying part of the body to be recorded 1 is constituted of a center side roller part formed of the sponge material such as foamed EPDM. Thus, the hardness of the end side roller part is set higher than that of the center side roller part. The driving force from a photoreceptor drum 1 is not affected by the body to be recorded 1, so that a high-definition image is obtained.

10. 发明专利

JPH1087103A IMAGE PRINTER 失效
公开(公告)号：JPH1087103A
公开(公告)日：1998-04-07
申请号：JP24312396
申请日：1996-09-13
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： OTSUKA HIDEFUMI , FUKUDA HIROMITSU , OSHIMA MINORU , FURUYA YUJI
IPC分类号： G03G15/01 , B65H5/02 , G03G15/16
摘要： PROBLEM TO BE SOLVED: To suppress a slip caused by toners between a belt employed at a transfer portion for toner images for feeding a recording medium and a driving roller for driving the belt in an image printer for forming images by means of toners which are transferred on a recording medium to print the images thereon. SOLUTION: A driving roller 1082 for driving a belt 1081 is made ragged so as to have over its whole surface adapted to contact with the belt 1081 a plurality of recesses of depths at least 0.5mm. Since the belt 1081 ruffles conforming to the recesses and projections, even when toners get between the driving roller 1082 and the belt 1081, toners adhering to the belt 1081 fall off it into the recesses of the driving roller 1082 to prevent a slip between the driving roller 1082 and the belt 1081 until the recesses are filled with toners.

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