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1. 发明专利

JPH09265227A ELECTRIFYING MEMBER AND ITS PRODUCTION 失效
公开(公告)号：JPH09265227A
公开(公告)日：1997-10-07
申请号：JP7293696
申请日：1996-03-27
申请人： RICOH KK
发明人： TABUCHI TAKESHI , KUROKAWA JUNJI
IPC分类号： G03G15/02 , F16C13/00 , G03G15/16
摘要： PROBLEM TO BE SOLVED: To maintain high surface resistance of an electrifying member and to prevent leaking of charges by forming a surface layer composed of an alcohol-soluble copolymer nylon resin and conductive carbon in such a manner that the carbon content is higher near the elastic layer and decreases with the distance from the elastic layer. SOLUTION: The electrifying roller 1 composed of a 8-ϕ core metal 101 (8mm diameter), an epichlorohydrin rubber elastic layer 102 having 3mm thickness, and a surface layer 103 on the elastic layer. The elastic layer 102 has 1.2×10 Ω.cm electric resistance, 42 rubber hardness (according to JISA), and 5.5μm surface roughness Rz. The surface layer 103 is formed by applying a coating liquid around the elastic layer 102, and the thickness of the surface layer 103 after dried is 10μm. The carbon content in the surface layer is higher near the elastic layer, while the carbon content decreases with the distance from the elastic layer.

2. 发明专利

JPH0749602A ROLLER ELECTROSTATIC CHARGING DEVICE 失效
公开(公告)号：JPH0749602A
公开(公告)日：1995-02-21
申请号：JP13250094
申请日：1994-05-24
申请人： RICOH KK
发明人： KUROKAWA JUNJI
IPC分类号： G03G15/02
摘要： PURPOSE:To provide the roller electrostatic charging device which suppresses the cost increase of the device itself, the cost increase of a power source and the generation of a large quantity of ozone, averts the deterioration of an electrostatic charging member and photosensitive body, averts pollution problems and enables uniform electrostatic charge with only the application of a DC voltage and the roller electrostatic charging device which has good durability. CONSTITUTION:This roller electrostatic charging device is constituted to uniformly electrostatically charge the surface of the drum-shaped or belt-shaped photosensitive body by applying only the DC voltage to an electrostatic charging roller 101 rotating in contact with the photosensitive body. This electrostatic charging roller 101 is composed of epichlorhydrine rubber and the roller hardness of the electrostatic charging roller 101 is specified to >=42 (by JIS A type hardness meter). More specifically, an elastic layer (3mm thickness) 103 of the epichlorhydrine is molded on an arbor 102 of 8phi in such a manner that the outside diameter of the roller attains 14phi. This elastic layer 103 is provided thereon with a surface layer (coating film) 104 of a thin (about 5mum) polyamide resin.

3. 发明专利

JPH05158326A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH05158326A
公开(公告)日：1993-06-25
申请号：JP34805591
申请日：1991-12-04
申请人： RICOH KK
发明人： KUROKAWA JUNJI
IPC分类号： G03G15/00 , G03G15/02 , G03G15/14 , G03G21/00
摘要： PURPOSE:To properly execute various kinds of corona discharging processing using an AC corona discharger in an image formation, regardless of the linear velocity of a photosensitive body. CONSTITUTION:The AC voltage of a frequency f(Hz) corresponding to the linear velocity v(mm/sec) of the photosensitive body 101, is applied on each AC corona discharger of a pretransfer charger 104 on which a DC biased AC voltage is applied, a separating charger 106, and a precleaning charger 107, which are disposed in the vicinity of the photosensitive body 101 turning at the linear velocity vmm/sec.

4. 发明专利

JPH04170868A IMAGE-FORMING DEVICE 失效
公开(公告)号：JPH04170868A
公开(公告)日：1992-06-18
申请号：JP29857690
申请日：1990-11-02
申请人： RICOH KK
发明人： SHOJI HISAFUMI , KUROKAWA JUNJI , HARASAWA YUKO , OGAWA TOMOKO
IPC分类号： H04N1/393 , H04N1/40 , H04N1/409
摘要： PURPOSE:To convert the density of an image element and to maintain the image of high quality by converting an image signal into an image signal consisting of the image elements of high quality, which corresponds to an enlarging mode, and executing a smoothing processing when an enlarging mode is instructed. CONSTITUTION:An image processing means 102 receiving the image signal which an image read means 101 outputs is caused to convert the image signal into the image signal consisting of the image element of high density, which corresponds to the enlarging mode, and to execute the smoothing processing. An image data signal outputted from a gamma correction circuit 120 executing a processing so that the inputted image data signal fits to the recording feature of an image recording part 103 is temporarily stored in a line memory 121 and is written into an appropriate address in accordance with a control signal. Thus, an oblique line becomes smooth even if the image is enlarged and jaggy or the like are cancelled.

5. 发明专利

JPH04106564A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH04106564A
公开(公告)日：1992-04-08
申请号：JP22385190
申请日：1990-08-25
申请人： RICOH KK
发明人： KUROKAWA JUNJI
IPC分类号： G03G15/02 , G03G15/00 , G03G15/16 , G03G21/00
摘要： PURPOSE:To reduce the quantity of corona products such as ozone, nitrogen oxide NOx, generated when corona discharging is carried out, and to prevent the occurrence of an abnormal image such as image blur, the void by uniformly charging a photosensitive body through the use of positive corona discharging. CONSTITUTION:The reflected light of an original 1 is converted to an electric signal form a CCD 5, and inputted into a laser diode driving circuit. After the surface of a photosensitive drum 9 is uniformly electrified to 800V by a corotron type electrifying charger 11, and a potential distribution is formed according to the turning-on and -off of laser light. The potential distribution formed on the drum 9 and the variable density distribution of a recorded image are in coincidence, so that an electrostatic latent image corresponding to the variable density of the original 1 is formed on the surface of the drum 1. A transfer roller 13 has the application of +800V at the same time when the drum 9 is rotated, and switching to the transfer bias of -1.2KV is carried out to transfer a toner image just before a recording sheet 17 reaches the transfer roller 13.

6. 发明专利

JPH01263665A DIGITAL IMAGE FORMING DEVICE 失效
公开(公告)号：JPH01263665A
公开(公告)日：1989-10-20
申请号：JP9295988
申请日：1988-04-15
申请人： RICOH KK
发明人： KUROKAWA JUNJI , MASUMURA MASAO , SAWAYAMA NOBORU
IPC分类号： G03G15/06 , G03G15/00 , G03G21/00
摘要： PURPOSE:To prevent an image from generating voids and having its ground stained by providing a developing bias switching means which increases and decreases a developing bias in addition to an image density adjusting means. CONSTITUTION:When a notch key 26 for image density adjustment on a console panel is operated, the set levels of the threshold values of all picture elements are increased or decreased to vary the density of a formed image. Further, when the white void prevention key 27 and ground staining prevention key 28 of a developing bias switching means are operated, the developing bias potential is increased or decreased to set the relation of the dark potential and light potential of an electrostatic latent image with the developing bias potential to the best condition. Therefore, the relation between the potential state of the electrostatic latent image formed on a photosensitive drum and the developing bias potential is adjusted to a proper state to prevent the formed image from generating voids and has its ground stained.

7. 发明专利

JPS63229968A CONTROL METHOD FOR CONTINUOUS PAGE COPYING 失效
公开(公告)号：JPS63229968A
公开(公告)日：1988-09-26
申请号：JP6520187
申请日：1987-03-18
申请人： RICOH KK
发明人： OGURA MASAAKI , ITO MASASHI , KUROKAWA JUNJI , OTA KIYOTAKA , HAYASAKA TOSHIAKI
IPC分类号： G03G21/00 , G03G15/00 , G03G15/22 , G03G15/36 , H04N1/00 , H04N1/10 , H04N1/107 , H04N1/387
摘要： PURPOSE:To display the size of respective pages and to copy in a center if the size of a copy paper is bigger than that of a page by discriminating the lengthwise direction of an original and extracting electric signals at every range in which the lengthwise direction is divided into two. CONSTITUTION:The relation of the original 99 and pictures A and B on the copy papers 24 (24a and 24b) is that a/2 in which the length (a) of the lengthwise direction of the original 99 is divided into two is the width of one page. If pages A and B are copied on the copy papers 24a and 24b, they are biased. Consequently, it is necessary to copy in the central part of the copy papers 24a and 24b. Thus, a scan SA with respect to the page A and a return RA to an original position, and a scan SAB with respect to the pages A and B and a return RAB are repeated, and a gate pulse (c) extracting a CCD output is obtained with delaying a write action with respect to a drum by a time T1 and a time T2 from respective scan start.

8. 发明专利

JPS62223766A METHOD FOR PREVENTING PHOTOSENSITIVE BODY FROM REVERSE ELECTROSTATIC CHARGE IN INVERSIONAL DEVELOPING TYPE ELECTROPHOTOGRAPHIC DEVICE 失效
公开(公告)号：JPS62223766A
公开(公告)日：1987-10-01
申请号：JP6789386
申请日：1986-03-25
申请人： RICOH KK
发明人： KUROKAWA JUNJI , OGURA MASAAKI , KOINUMA NORIYUKI
IPC分类号： G03G15/16 , G03G15/00 , G03G21/14
摘要： PURPOSE:To prevent a photosensitive body from receiving reverse charge at the time of transfer charge and to remove band-like dirt on recording paper by shortening transfer charge time by a slight period shorter than the passage time of a blank part of the recording paper in the front and back parts of a primary charging area. CONSTITUTION:Negative primary charge is applied to the surface of a function separating type photosensitive body 1 only by a period corresponding to the quantity of optical information to be written from a primary charger 2 through a primary charge output device 6 on the basis of a signal outputted from a CPU. After starting primary charging, a transfer charger 4 is controlled by a timer 5 to which a primary charge voltage and a transfer charge voltage are inputted from the CPU through signal lines l1, l2 and starts its transfer charge after the passage of time shorter than the slight period required for the passage of the blank part of the recording paper 9 after the passage of the leading end part of the primary charge area through the charger 4. The charger 4 ends the transfer charge before the time shorter than the slight period required for the passage of the blank part of the paper 9 immediately before the passage of the final end part of the primary charging area through the charger 4, to transfer toner on the photosensitive body 1 to paper 9.

9. 发明专利

JPS6156509B2 失效
公开(公告)号：JPS6156509B2
公开(公告)日：1986-12-02
申请号：JP11051877
申请日：1977-09-16
申请人： RICOH KK
发明人： UCHIDA MITSURU , KUROKAWA JUNJI , MARUYAMA KATSUJI
IPC分类号： G03G9/10 , G03G9/113

10. 发明专利

JPS5162731A Riidaapurintaa 失效
公开(公告)号：JPS5162731A
公开(公告)日：1976-05-31
申请号：JP11795674
申请日：1974-10-14
申请人： Ricoh Kk
发明人： HIROSE HIROSHI , YAMADA HIROSHI , SEKO NACHIO , KUROKAWA JUNJI , IKESUE MASUMI , SHIMOMURA AKIZO , YAMAZAKI HIDEO , TAKEDA HIROKI , SAKURAI TETSUO , MANO KOJI , FUKUDA MINORU , SOGA SETSUO , NOGUCHI YUKIO
IPC分类号： G03B27/32 , G03B21/11 , G03G15/22 , G03G15/26
CPC分类号： G03B21/118 , G03G15/26

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