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1. 发明专利

JP2001324857A ELECTROPHOTOGRAPHIC IMAGE FORMING METHOD, ELECTROPHOTOGRAPHIC IMAGE FORMING DEVICE AND PROCESS CARTRIDGE 失效
公开(公告)号：JP2001324857A
公开(公告)日：2001-11-22
申请号：JP2000142008
申请日：2000-05-15
申请人： CANON KK
发明人： SAKO SHUNKAI , TSUJI HARUYUKI , TAKAGI SHINJI , SAITO HIROSHI
IPC分类号： G03G15/02 , G03G5/147 , G03G15/08 , G03G15/16
摘要： PROBLEM TO BE SOLVED: To provide an electrophotographic image forming method, an electrophotographic image forming device and a process cartridge capable of maintaining high image quality over a long term by preventing the damage of a photoreceptor due to the attachment/detachment of a transfer means. SOLUTION: In an electrophotographic image forming system having a stage to electrify the electrophotographic photoreceptor by bringing an electrifying member consisting of magnetic particles into contact with the photoreceptor and applying voltage, a stage to form the latent image by exposing the photoreceptor, a developing stage to make the latent image visualizable with toner, a stage to transfer a toner image to a transfer member, and a mechanism for attaching/detaching the transfer member to/from the photoreceptor, universal hardness HU in the surface coating film material test of the photoreceptor is >=200 N/mm2 (provided that a curve showing relation between hardness H and the indentation depth (h) of an indenter does not have an inflection point), the volume average particle size of the magnetic particle is >=10 μm and 50 μm is

2. 发明专利

JP2001301145A INK JET RECORDER 失效
公开(公告)号：JP2001301145A
公开(公告)日：2001-10-30
申请号：JP2000122572
申请日：2000-04-24
申请人： CANON KK
发明人： TAWARAYA HIROYUKI , TAKAGI SHINJI , KASAMATSU TAKEHIKO , TANAKA HIDEKI
IPC分类号： B41J2/01 , B41J2/175 , B41J2/18 , B41J2/185
摘要： PROBLEM TO BE SOLVED: To provide a preliminary ejection means advantageous in the throughput aspect and cost aspect and causing no obstacle to reduction in the size of a recorder in a system using a processing liquid for enhancing adhesion and water fastness of ink in order to prevent the image quality from lowering due to blur at the time of recording on a recording medium, e.g. a plain paper, by a conventional ink jet recording system. SOLUTION: Preliminary ejection of processing liquid dot is carried out on a margin 8A on the starting side of recording in the carrying direction of a recording medium 7.

3. 发明专利

JP2001125345A IMAGE FORMING METHOD, IMAGE FORMING DEVICE AND PROCESS CARTRIDGE 失效
公开(公告)号：JP2001125345A
公开(公告)日：2001-05-11
申请号：JP30858299
申请日：1999-10-29
申请人： CANON KK
发明人： TSUJI HARUYUKI , SAKO SHUNKAI , TAKAGI SHINJI
IPC分类号： G03G15/02 , G03G5/147 , G03G15/08
摘要： PROBLEM TO BE SOLVED: To provide an image forming method, an image forming device and a process cartridge that an image of high quality can be stably obtained without any generation of an image failure such as a fogged image or unevenness in density due to deterioration in electrification, any generation of an image failure due to damage of a photoreceptor, any leaking of carrier such as magnetic particle to the photoreceptor from a primary electrifying device and any generation of an image failure such as unevenness in image due to memory even under low humidity. SOLUTION: In the image forming method, a primary electrifying process where electrification by injection of charge where charge is directly injected to an electrophotographic photoreceptor is major, a developing process and a transfer process are included, a cleaning process recovering toner particles remaining on the electrophotographic photoreceptor is not included before the primary electrifying process, an auxiliary electrifying process where reverse bias from the primary electrification is applied is included, and time for the primary electrifying and time for the auxiliary electrifying satisfy a specified condition, and the image forming device and the processing cartridge are provided.

4. 发明专利

JP2001125286A ELECTROPHOTOGRAPHIC PHOTORECEPTOR, ELECTROPHOTOGRAPHIC IMAGE FORMING DEVICE PROVIDED WITH THE SAME, AND PROCESS CARTRIDGE 失效
公开(公告)号：JP2001125286A
公开(公告)日：2001-05-11
申请号：JP30858199
申请日：1999-10-29
申请人： CANON KK
发明人： TAKAGI SHINJI , SAKO SHUNKAI , TSUJI HARUYUKI , SAITO HIROSHI
IPC分类号： G03G15/02 , G03G5/047
摘要： PROBLEM TO BE SOLVED: To obtain an electrophotographic photoreceptor which prevents its dielectric breakdown due to a flaw which occurs in the photoreceptor in a transfer step and reaches the electric charge transferring layer and a recess in the electric charge generating layer, suppresses the occurrence of black spots in the white ground part of an image and retains high image quality over a long period of time and to obtain an electrophotographic image forming device with the photoreceptor, and a process cartridge detachably attached to the device. SOLUTION: At least an electric charge generating layer, an electric charge transferring layer and an electric charge injecting layer are successively laminated to obtain the objective electrophotographic photoreceptor applied to an injection electrifying process. The Universal hardness HU of the electric charge transferring layer in a physical property test of a surface coating in a certain environment (22.5 deg.C/50% RH) is >=200 [N/mm2].

5. 发明专利

JP2000194171A ELECTROPHOTOGRAPHIC DEVICE 失效
公开(公告)号：JP2000194171A
公开(公告)日：2000-07-14
申请号：JP37018898
申请日：1998-12-25
申请人： CANON KK
发明人： IKESUE TATSUYA , MORIKAWA YOSUKE , TAKAGI SHINJI , ASANO KUMIKO , TSUJI HARUYUKI
IPC分类号： G03G15/02 , G03G5/04 , G03G5/06 , G03G5/147 , G03G15/00 , G03G15/06 , G03G21/00
摘要： PROBLEM TO BE SOLVED: To provide an electrophotographic device capable of maintaining an image of high quality for a long period. SOLUTION: As for the electrophotographic device equipped with an electrophotographic photoreceptor including charge generating material and charge transfer material, the film thickness of the photoreceptive layer of the photoreceptor is controlled to be

6. 发明专利

JPH11327168A ELECTROPHOTOGRAPHIC PHOTORECEPTOR AND ELECTROPHOTOGRAPHY DEVICE USING IT 失效
公开(公告)号：JPH11327168A
公开(公告)日：1999-11-26
申请号：JP12878998
申请日：1998-05-12
申请人： CANON KK
发明人： MORIKAWA YOSUKE , SAKO SHUNKAI , TSUJI HARUYUKI , ASANO KUMIKO , TAKAGI SHINJI
IPC分类号： G03G15/02 , G03G5/00 , G03G5/04
摘要： PROBLEM TO BE SOLVED: To provide an elecrophotographic photoreceptor and an electrophotographic device using it, which causes no defect in charging, no fogging image and no leakage problem of a carrier of a charging member such as a magnetic brush, can stably supply a copy image with high quality, produces little ozone and is ecologically excellent. SOLUTION: In an electrophotographic photoreceptor used in an electrophotographic device in which charging by injecting charges directly from the charged member to the photoreceptor is dominant, oxidation potential of a charge transferring material used for the photoreceptor is not less than 0.60 V. In this case, the device does not have, before a primary charging means, a cleaning means to collect toner particles remained on a light-sensitive body after transferring, and has an auxiliary charging apparatus to apply a reverse bias of the primary charging between the primary charging means and a transferring means by making contact with the photoreceptor, while the charging means is a contact charging means having a charged member to which a voltage is applied by making contact with the light-sensitive body.

7. 发明专利

JPH1110846A IMAGE FORMING APPARATUS, ITS METHOD AND STORAGE MEDIUM 失效
公开(公告)号：JPH1110846A
公开(公告)日：1999-01-19
申请号：JP16433697
申请日：1997-06-20
申请人： CANON KK
发明人： TAKAGI SHINJI , TANAKA HIDEKI , TAWARAYA HIROYUKI , KASAMATSU TAKEHIKO
IPC分类号： B41J2/01 , B41J2/51
摘要： PROBLEM TO BE SOLVED: To improve a processing speed. SOLUTION: The image forming apparatus comprises a recording head 107 and a recording head moving mechanism 108 for moving the head 107 in a main scanning direction. In this case, each time the head 107 is moved at a predetermined interval, inks are alternately discharged from one row or the other row of ink discharge ports of the head 107 to form an image responsive to image data. A separating circuit 104 separates the image data into image data even (Even) and image data odd (Odd). The inks are discharged from the discharge ports of one row based on the image data even (Even) when the head 107 is disposed at a predetermined recording position, the image data odd (Odd) is stored in a buffer 110. Then, when the head 107 is moved from the predetermined recording position at a predetermined interval, the image data odd (Odd) is read from the buffer 110, and the inks are discharged from the ports of the other row based on the image data odd (Odd).

8. 发明专利

JPH10157091A INK JET RECORDER 失效
公开(公告)号：JPH10157091A
公开(公告)日：1998-06-16
申请号：JP32406296
申请日：1996-12-04
申请人： CANON KK
发明人： KASAMATSU TAKEHIKO , TAKAGI SHINJI , TANAKA HIDEKI , TAWARAYA HIROYUKI
IPC分类号： B41J2/01 , B41J2/205 , B41M5/00
摘要： PROBLEM TO BE SOLVED: To obtain an ink jet recorder in which the availability of respective nozzles in a head for forming a dot of processing liquid while eliminating blur of ink can be averaged. SOLUTION: When jetting of processing liquid is controlled for even number 2, 4, 6... of pixel rows in the main scanning direction, an edge at the coordinate (6, b) in a pixel row 6 representative of transition from no jet of recording dot to a jet of recording dot is detected. At first, a processing liquid dot is jetted to that edge and then it is jetted to coordinates (6, d), (6, f), (6, h)... for every other pixel. Since the processing liquid is jetted at an edge and then it is jetted depending on the ratio of processing liquid dot/recording dot (25% in this case, for every other pixel), the processing liquid jetting nozzle is varied depending on the recording data and the availability of respective nozzles in a processing liquid dot forming head is averaged.

9. 发明专利

JPH09109381A APPARATUS AND METHOD FOR INK JET PRINTING 失效
公开(公告)号：JPH09109381A
公开(公告)日：1997-04-28
申请号：JP27298195
申请日：1995-10-20
申请人： CANON KK
发明人： TAKAGI SHINJI , TAWARAYA HIROYUKI , KASAMATSU TAKEHIKO , TANAKA HIDEKI
IPC分类号： B41J2/21 , B41J2/01 , B41J2/205 , B41M5/00
摘要： PROBLEM TO BE SOLVED: To suitably make adhere treatment liquid to the surface to be recorded in an ink jet printer using a head capable of forming a recording dot by discharging ink from a plurality of discharge ports and a head for the liquid having the same constitution as that of the recording head by forming treatment liquid dot by discharging the liquid for enhancing the ink fixing properties onto the medium. SOLUTION: This apparatus for ink jet printing comprises OR calculating means 709 for calculating OR of drive data of a plurality of recording heads, differentiating means 710 for differentiating the output, AND and OR calculating means 711 for calculating AND and OF of the drive data and the differentiated output, and dither processing means 712 for dither-processing the output, wherein the treatment liquid head is discharged based on the output. Thus, the liquid is discharged in response to the sum of the discharged ink, the discharge port for discharging the liquid is not extremely deviated, but adheres the suitable amount at the suitable position responsive to the recording data onto the surface to be recorded.

10. 发明专利

JPH08281932A INK JET PRINTING APPARATUS 失效
公开(公告)号：JPH08281932A
公开(公告)日：1996-10-29
申请号：JP2126596
申请日：1996-02-07
申请人： CANON KK
发明人： KASAMATSU TAKEHIKO , TAWARAYA HIROYUKI , TAKAGI SHINJI , TANAKA HIDEKI
IPC分类号： B41J3/54 , B41J2/01 , B41J2/205 , B41J2/21 , B41M5/00 , G06K15/10
摘要： PURPOSE: To reduce a count of memories necessary for discharging of a processing liquid as much as possible and print well in an ink jet printing apparatus which performs printing by discharging an ink and the processing liquid making the ink insoluble or coagulate. CONSTITUTION: As memories for discharge data of an amount scanned by a head, only memories 101-104 for corresponding colors of ink are provided in the apparatus. A discharge data for a processing liquid is formed by a data- forming part 113 based on data obtained by data-switching parts 121-124. The formed discharge data is stored in a buffer 114 by a count of discharge ports of the head and supplied to the head 31.

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