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1. 发明专利

DE19731752A1 Method of controlling illumination for electric photographic device 未知
公开(公告)号：DE19731752A1
公开(公告)日：1998-01-29
申请号：DE19731752
申请日：1997-07-23
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： MARUO SEIJI , OKADA HISAO , MABUCHI HIROYUKI , OBARA KAZUTOSHI , ITO KENICHI
IPC分类号： B41J2/525 , B41J2/44 , G03G15/01 , G03G15/04 , G03G15/043 , G03G15/08
摘要： The method controls illuminations for the device using a three level developing process. The occurrence of an edge effect is suppressed by weakening an inverse electric field which generates the edge around a section of an image using an illumination controller. Information based on the edge characteristics may be used as judgement information for setting the illumination control. Only one level of the electric potential of the surface is used as a value for the illumination control. Ferrite and magnetite may be used as a base material of the carrier.

2. 发明专利

DE19731752C2 未知
公开(公告)号：DE19731752C2
公开(公告)日：2001-02-22
申请号：DE19731752
申请日：1997-07-23
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： MARUO SEIJI , OKADA HISAO , MABUCHI HIROYUKI , OBARA KAZUTOSHI , ITO KENICHI
IPC分类号： B41J2/525 , B41J2/44 , G03G15/01 , G03G15/04 , G03G15/043 , G03G15/08
摘要： In the tri-level process in which positive and negative latent images are formed on a photosensitive body and then developed using toners of two colors (for example, red and black) charged respectively to opposite polarities with respect to the polarities of the latent images, there has been a problem of degrading the quality of a two-color picture by the appearance of a special phenomenon in which red toner is attached around a black image and black toner is attached around a red image by attraction of the reverse electric field. An exposure control is performed in order to suppress the fringe phenomenon.

3. 发明专利

DE19935971A1 Multi laser beam image recording device for laser printer pulse-width modulates interference data output from memory in sequence in which they were written based on delay data 未知
公开(公告)号：DE19935971A1
公开(公告)日：2000-03-23
申请号：DE19935971
申请日：1999-07-30
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： KOBAYASHI SHINYA , SATOH KUNIO , EDO SUSUMU , MARUO SEIJI , KUMASAKA TAKAO , ONOSE ATSUSHI
IPC分类号： B41J2/47 , B41J2/455
摘要： Device has multiple light sources for exposing light-sensitive drum. Image signals corresponding to each light source are made to interfere only with preset light quantity components. Pixel clocks corresponding to each light source are delayed by preset delay times. Interference data are synchronized with pixel clocks and written to memory, and output in sequence in which they were written according to delayed data output from delay device. Interference data are output from memory and pulse-width modulated. Eight Independent claims are included for an image recording device.

4. 发明专利

DE19718413A1 Colour laser printer with adjustable intensity semiconductor laser 未知
公开(公告)号：DE19718413A1
公开(公告)日：1997-11-06
申请号：DE19718413
申请日：1997-04-30
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： NAKATSUKA SHIN ICHI , MARUO SEIJI , KOBAYASHI SHINYA , ARIMOTO AKIRA , NAKANO YUKIO
IPC分类号： B41J2/455 , B41J2/47 , H01S5/042 , H01S5/062 , H01S5/0625 , H01S5/223 , H01S5/343 , H01S5/40 , G03G15/04 , H01S3/103
摘要： The printer has the diameter of deposited colour particle dots which are dependent on the laser light intensity. Thus when the output power of the laser is low, the diameter is adjusted to be larger. When the output power is high, the diameter is adjusted to be lower. The printer has a photo-conductor (109) which is irradiated by a laser light source (101) so that the potential on the outer surface of the photo-conductor is varied. The adherence of colour particles to the surface is controlled prior to transfer of the image to a medium to be printed. The colour particles are of two or more types with different charging properties.

5. 发明专利

JPH08201710A OPTICAL SCANNER 失效
公开(公告)号：JPH08201710A
公开(公告)日：1996-08-09
申请号：JP1229795
申请日：1995-01-30
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： MARUO SEIJI , ARIMOTO AKIRA
IPC分类号： B41J2/44 , G02B26/10 , G02B26/12
摘要： PURPOSE: To realize the control of polarization without being affected by environmental change and to apply it to a printer so as to obtain a very accurate printed image by adding output from a reference polarization signal generating means to a polarization control means thereby obtaining a polarized light beam for a reference polarization signal, detecting the deviation of the polarized light beam from a specified polarization state by a polarization state detecting means and correcting it. CONSTITUTION: A polarizing means 103 is arranged between a semiconductor laser light source 101 and a rotary polygon mirror 105 and set in an initial state so as to change the polarization direction of a laser beam being the nearly linearly polarized light beam. Namely, the polarized light beam 111 is generated under the control of a polarization and light quantity control circuit 110. By arranging a half mirror 601 used as a spectrally splitting means and then polarization films 602 and 603 arranged mutually in optical cross Nicol before two photoreceptor drums 108 and 109, one photoreceptor drum is irradiated only with unidirectional polarized light beams 112 and 113. A line synchronizing signal receiving part 115 takes write start timing for every surface of the polygon mirror 105.

6. 发明专利

JP2000085177A IMAGE RECORDING APPARATUS AND IMAGE RECORDING SYSTEM 失效
公开(公告)号：JP2000085177A
公开(公告)日：2000-03-28
申请号：JP26269798
申请日：1998-09-17
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： KOBAYASHI SHINYA , SATO KUNIO , EDO SUSUMU , MARUO SEIJI , KUMASAKA TAKAO , ONOSE ATSUSHI
IPC分类号： B41J2/44
摘要： PROBLEM TO BE SOLVED: To obtain a high image quality and sophisticated recording image without a scanning line interval irregularity or a scanning line jig by outputting interference data in the writing order by delay data outputted from a delay part, and applying a pulse width modulation to the outputted interference data. SOLUTION: Video signals VD1-VD4 from a printer controller are inputted in an interference circuit 101. The interference circuit 101 has the signals interfere with each other only for the set light amount component by a means for setting the interference light amount 102 among the video signals VD1-VD4. Each signal VDd1-VDd4 data are successively written in a FIFO(first-in-first-out memory) 103 by each pixel clock DCLKd1-DCLKd4 data outputted from a delay circuit 104. The interference data VDd1-VDd4 from the FIFO 103 are applied with a pulse width modulation by a pulse width modulation circuit 106.

7. 发明专利

JPH11174788A EXPOSURE CONTROLLER FOR ELECTROPHOTOGRAPHIC DEVICE 失效
公开(公告)号：JPH11174788A
公开(公告)日：1999-07-02
申请号：JP34461797
申请日：1997-12-15
申请人： HITACHI KOKI KK , HITACHI LTD
发明人： ISHII MASAYOSHI , HOSHI NOBUYOSHI , SHIMIZU RYUICHI , OKADA HISAO , MABUCHI HIROYUKI , MITSUYA TERUAKI , ITO KENICHI , AKATSU SHINICHI , MARUO SEIJI
IPC分类号： G03G21/00 , G03G15/047
摘要： PROBLEM TO BE SOLVED: To obtain a simple and compact electrophotographic device constituted so that a fringe phenomenon can be suppressed by applying auxiliary exposure to a position where the fringe phenomenon is expected to be caused, that means, a white part around an image with such light quantity that potential between the potential for developing toner and the intermediate potential is generated. SOLUTION: At an exposure time after a photoreceptor 1 is electrified, the photoreceptor 1 is exposed with such light quantity that three potential parts being the electrifying potential part where the toner is regularly developed, the discharge potential part where the toner is reversely developed and the intermediate potential part where the toner is not developed are formed. By an exposure control means 4, the white part all around the image where a reverse electric field is caused and an auxiliary exposure position are decided so as to make an exposure element emit light with auxiliary exposure quantity. Then, the white part which is formed on the back end of the potential part where the toner is developed in the rotating direction of a developing roll and where the reverse electric field is caused is exposed by such light quantity that the potential between the potential for developing the toner and the intermediate potential is generated. Besides, the white part which is formed on the front side and at the side part and where the reverse electric field is caused is exposed by such light quantity that the intermediate potential is generated.

8. 发明专利

JPH10282440A OPTICAL SCANNER AND ELECTROPHOTOGRAPHIC RECORDER 失效
公开(公告)号：JPH10282440A
公开(公告)日：1998-10-23
申请号：JP8305897
申请日：1997-04-01
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： MARUO SEIJI , NAKATSUKA SHINICHI , KOBAYASHI SHINYA
IPC分类号： B41J2/44 , G02B26/10 , G03B33/12
摘要： PROBLEM TO BE SOLVED: To obtain a compact optical scanner whose scanning accuracy is high by constituting a laser light source so that plural semiconductor laser chips emitting laser light beams whose wavelength is different are arranged to be arrayed, separating the deflected laser light beams every wavelength and sending them toward plural scanning positions. SOLUTION: By the GaN system multichip semiconductor laser light source 101, the synthetic laser light beam including the laser light beams of four kinds of wavelength is outputted. Then, the synthetic laser light beam is spectrally split to four single laser light beams by dichroic mirrors 106-109 corresponding to the wavelength of the synthetic laser light beam. The images of four spectrally split single light beams are respectively formed on photoreceptor drums 110-113 so as to form spots. By the spots, the surfaces of the drums 110-113 are respectively scanned in a shaft direction according to the polarizing scanning of the synthetic laser light beam deflected by a polygon mirror 104. Since the optical axes of the synthetic laser light beams outputted from the light source 101 coincide, an accurate optical scanning action is realized.

9. 发明专利

JPH0862523A OPTICAL SCANNER 失效
公开(公告)号：JPH0862523A
公开(公告)日：1996-03-08
申请号：JP20172094
申请日：1994-08-26
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： MARUO SEIJI , ARIMOTO AKIRA
IPC分类号： G02B26/10 , G02F1/13 , G02F1/137
摘要： PURPOSE: To obtain an analyzation characteristics with less light quantity fluctuation in scanning by independently controlling two pieces of information in one beam and using a guest host liquid crystal cell as an analyzation means for dividing before a scanning position. CONSTITUTION: A polarization switch 103 is arranged between a laser light source and a rotary polygon mirror 105 by using a laser 101, and the polarization direction of a laser beam of linear polarization is changed. A polarization beam 111 is generated by controlling the polarization and light quantity by a control circuit 110. Further, a half mirror 107 holding a polarization state and equally dividing the light quantity is arranged before two photosensitive drums 108, 109, and the equivalent polarization beams 112, 113 are faced to two photosensitive bodies respectively. The guest host liquid crystal cells 114, 115 of which the absorption axes are oriented in a crossnicol arrangement, and they detect the light orthogonal with each other. The light is absorbed by a dystuff in the guest host liquid crystal cell. At this time, by controlling the direction of the dystuff within a vibration surface of light, the analyzation characteristics with less light quantity fluctuation in scanning is obtained.

10. 发明专利

JPH06265801A LASER PRINTER DEVICE 失效
公开(公告)号：JPH06265801A
公开(公告)日：1994-09-22
申请号：JP4898393
申请日：1993-03-10
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： ARIMOTO AKIRA , MARUO SEIJI
IPC分类号： B41J2/44 , G02B26/10 , G03G15/01
摘要： PURPOSE:To enable a color printing using toners having four kind of colors by single running and to provide a high-speed printer with a simple constituting by exposing two places on a photosensitive body simultaneously with one optical system. CONSTITUTION:The polarization direction of a laser beam of a linear polarization is changed by arranging a polarization switch 103 between a laser beam source and a rotating polygon mirror 105 using one laser 101. A polarized light 111 is formed by controlling a polarization and a light quantity by a controller 110. One directional light of polarizations 112, 113 is made to head to one photosensitive body by arranging a polarizing beam splitter 107 which passes one of polarization and reflects other polarization in front of two photosensitive drums 108, 109. Then, latent images of different colors are formed on the same photosensitive drum 108 by irradiating different places on the photosensitive drum 108 with laser beams splitted by the polarizing splitter 107 by using a mirror or the like.

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