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21. 发明专利

JP2000137382A TONER SEAL MEMBER, DEVELOPING DEVICE IMAGE FORMING DEVICE, AND PROCESS CARTRIDGE 失效
公开(公告)号：JP2000137382A
公开(公告)日：2000-05-16
申请号：JP31116398
申请日：1998-10-30
申请人： CANON KK
发明人： KONISHI TAKESHI , OKANO KEIJI , SATO HIROSHI , DOMON AKIRA , NODA SHINYA , NISHIUETOKO TSUTOMU , MOTOHASHI SATORU
IPC分类号： G03G21/18 , G03G15/08
摘要： PROBLEM TO BE SOLVED: To reduce an end part fogging and to stably obtain a high-quality image while miniaturizing the device and surely preventing toner from being leaked by constituting an end-part leakage preventing member of a foaming polyurethane whose density and number of cells are specified. SOLUTION: End-part seal members 17 are made to abut on both end parts of a developing roller 10 so that the toner is not leaked from a gap between both end parts of the roller 10 and a developing blade 11 in the longitudinal direction. Thus, since the seal members 17 and the roller 10 are stuck to each other without leaving the gap, the toner is prevented from being leaked. The seal members 17 are made to adhere to the inside wall of a developing frame so as to abut on both ends the roller 10 by surrounding them. Besides the end- part leakage prevention members 15 are arranged in order to prevent the toner from being leaked from the gap between the blade 11 and the inside wall of the developing frame. The leakage prevention member 15 is formed by using the foaming polyurethane, whose density is 20 to 40 (kg/m3) and whose number of cells is 40 to 60 (pieces/25 mm), and stuck to the blade 11, the surface of the roller 10 and the inside wall of the developing frame.

22. 发明专利

JP2000131856A ELECTROPHOTOGRAPHIC PHOTORECEPTOR, IMAGE FORMING DEVICE AND PROCESS CARTRIDGE 失效
公开(公告)号：JP2000131856A
公开(公告)日：2000-05-12
申请号：JP30230498
申请日：1998-10-23
申请人： CANON KK
发明人： DOMON AKIRA , OKANO KEIJI , SATO HIROSHI , SAITO MASANOBU , SHIMIZU YASUSHI , MOTOHASHI SATORU , KONISHI TAKESHI
IPC分类号： G03G15/02 , G03G5/05 , G03G21/10
摘要： PROBLEM TO BE SOLVED: To provide an electrophotographic photoreceptor that prevents the occurrence of image defects due to the wear of the surface of the photosensitive drum as well as image flowing, can stably reproduce density and the thickness of letters and can minimize the increase of cost. SOLUTION: The electrophotographic photoreceptor has a photosensitive layer on the electrically conductive substrate and the photosensitive layer contains at least one polycarbonate resin (I) having a viscosity average molecular weight of =1.5×104. The polycarbonate resin I is contained by 30-95 pts.wt. in the composition consisting of the polycarbonate resins I and II. The photosensitive layer further contains 1-10 pts.wt. powdery fluororesin based on the total weight of the constituent materials of the photosensitive layer.

23. 发明专利

JP2000050019A IMAGE READER 失效
公开(公告)号：JP2000050019A
公开(公告)日：2000-02-18
申请号：JP21560198
申请日：1998-07-30
申请人： CANON KK
发明人： ARAI KOJI , SATO HIROSHI , KURITA MITSURU , YAMAGATA SHIGEO
IPC分类号： H04N1/04
摘要： PROBLEM TO BE SOLVED: To reduce color smear in an auxiliary scanning direction by constituting a means for reducing the centroid shift of a reading position in the auxiliary scanning direction of a plurality of line sensors, which is generated by the afterglow characteristics of the respective colors of a white light source for original irradiation, by means of hardware through the use of a pulse width modulation system. SOLUTION: The light control signal of a fluorescent lamp for original irradiation does not start control in synchronizing with the start-up of an Hsync period but executes control so that it is matched with a center reference. Even if the duty of the light control signal changes, a center position does not change. Thus, a start-up position is controlled to be variable in accordance with duty. The afterglow quantity of green and red is distributed to the front and the back of a light emitting area and they are averaged. Then, centroid shift quantity is reduced from d2 to fine d1. Thus, it can be set to a level which does not matter on the performance degradation of picture reading by line sensors at all.

24. 发明专利

JP2000050017A IMAGE READER AND IMAGE READING METHOD 失效
公开(公告)号：JP2000050017A
公开(公告)日：2000-02-18
申请号：JP21559998
申请日：1998-07-30
申请人： CANON KK
发明人： SUGIURA TAKASHI , SATO HIROSHI , SHIMOMURA HIDEKAZU , SATOMURA SEIICHIRO
IPC分类号： H04N1/04
摘要： PROBLEM TO BE SOLVED: To prevent color smear in an auxiliary direction by image-forming image information of an original on a plurality of line sensors by an image forming optical system, taking out only charges which a plurality of line sensors accumulate in a lighting period by the light control of a white light source for original irradiation different in the afterglow characteristics of respective colors, and then reading the image information. SOLUTION: Image information of an original is image-formed on a plurality of line sensors through an image forming optical system and it is read. In an image reading period, not a whole Hsync period but only the period of light control by the lighting signal of a fluorescent lamp, which is synchronized with the period, is controlled to be read. The line sensor converts only light energy in the light control period into charges and the line sensors are controlled so that centroid shift by afterglow is reduced as much as possible. Thus, the ability deterioration of image reading by the afterglow characteristic of red and green can be prevented, and color smear at the reading in an auxiliary direction is eliminated.

25. 发明专利

JPH11331515A IMAGE READER AND READ CORRECTION METHOD FOR THE READER 失效
公开(公告)号：JPH11331515A
公开(公告)日：1999-11-30
申请号：JP14520498
申请日：1998-05-12
申请人： CANON KK
发明人： SATO HIROSHI , YAMAGATA SHIGEO , MIKAMI FUMIO
IPC分类号： H04N1/028 , H04N1/04
摘要： PROBLEM TO BE SOLVED: To cancel the correction errors which are caused by various factors including a line error by correcting the displacement of a reading position based on the phase shifts of output signals of plural image pickup elements owing to the spaces which are set among these pickup elements. SOLUTION: Three line sensors successively reads the image information in order of R, G and B. A line-like chart where black and white charts are repeated in a fixed cycle and in the vertical scanning direction is read in the vertical direction. Then a standard color is defined as B and a space is set at n1 between B and G line sensor with a space set at n2 between B and R line sensors respectively. Under such conditions, both n1 and n2 can be measured by means of a difference signal Os of every output signal. The signal Os of every color is not set at the perfectly fixed value due to various vibration factors but shows a waveform that vibrates around a fixed average level. The offsets α1 and α2 are caused with the B-G and B-R signals respectively and accordingly the pixel slippage is caused. Thus, this offset correction is carried out together with the inter-line correction.

26. 发明专利

JPH11305595A HEATING DEVICE AND IMAGE FORMING DEVICE 失效
公开(公告)号：JPH11305595A
公开(公告)日：1999-11-05
申请号：JP13264898
申请日：1998-04-27
申请人： CANON KK
发明人： SATO HIROSHI
IPC分类号： G03G15/20 , G03G15/00
摘要： PROBLEM TO BE SOLVED: To provide a heating device which is excellent in responsiveness and heat efficiency while inhibiting the deterioration of flickers and reducing a rush current by avoiding sudden fluctuation of the current consumed. SOLUTION: In addition to a halogen heater 3, a resistor heater 4 is placed within a fixing roller 1 and is kept on during printing, the electric power of the resistor heater 4 being such that even if the resistor heater 4 is kept on during printing, the surface temperature of the fixing roller 1 does not continue to rise but is kept slightly lower than a predetermined fixing temperature. By turning the halogen heater 3 on and off, heating control is effected so that the predetermined fixing temperature is maintained.

27. 发明专利

JPH11249392A CLEANING MEMBER FOR ELECTRIFYING ROLLER, ELECTRIFYING DEVICE AND PROCESS CARTRIDGE EQUIPPED THEREWITH 失效
公开(公告)号：JPH11249392A
公开(公告)日：1999-09-17
申请号：JP4699898
申请日：1998-02-27
申请人： CANON KK
发明人： YAMAUCHI KAZUMI , SATO HIROSHI , OGATA HIROAKI
IPC分类号： G03G15/02 , G03G21/18
摘要： PROBLEM TO BE SOLVED: To prevent the surface of an electrifying member from being irregularly cleaned by making a cleaning member a sheet-like one and providing a linear groove part at a part of the cleaning member in contact with a electrifying roller. SOLUTION: A sheet material 31 is pressed to an electrifying roller 10 so as to remove dirt adhering to its surface. Sheet material such as organic resin, etc., paper and cloth are also used as the sheet material 31. Many linear minute recessed and projected parts are formed nearly in one direction on the surface of the material 31 by cutting work by abrasive paper, abrasive or a grinder. Since the minute groove (crest) is formed in the rotating direction of the roller 10, dirt on the roller surface carried by the rotation of the roller 10 easily passes through the abutting part of the roller 10 on the sheet. Even when the dirt stays in the abutting part, it is easily discharged to a downstream side in the rotating direction by the rotation of the roller. Thus, the dirt hardly remains and irregular cleaning caused by the difference in cleaning ability between a part where the dirt stays and other parts is prevented.

28. 发明专利

JPH11174356A MULTIBEAM SCANNING OPTICAL SYSTEM AND IMAGE FORMING DEVICE USING THE SAME 失效
公开(公告)号：JPH11174356A
公开(公告)日：1999-07-02
申请号：JP36368797
申请日：1997-12-16
申请人： CANON KK
发明人： SATO HIROSHI
IPC分类号： B41J2/44 , G02B26/10 , G03G15/04 , H04N1/113
摘要： PROBLEM TO BE SOLVED: To obtain a multibeam scanning optical device which can prevent a ghost from being formed with regularly reflected light from a photoreceptor surface and a laser beam source from varying in the quantity of light emission owing to return light. SOLUTION: The multibeam scanning optical system scans the photoreceptor surface 5 with a plurality of luminous fluxed at the same time by making a plurality of the luminous fluxes emitted by a light emission means having light source parts incident on the deflecting surface of an optical deflector 1 and guiding the luminous fluxed deflected and reflected by the deflecting surface to positions on the photoreceptor surface 5 which are close to each other in the vertical scanning direction through corresponding image forming means 3a and 3b and reflecting members 4a and 4b. In this case, the angles of the reflecting members 4a and 4b to the main light beams 6a and 6b are so set that the main light beams 6a and 6b of the pieces of luminous flux made incident on the photoreceptor surface are made incident at asymmetrical angles to the normal of the photoreceptor surface 5 in the vertical scanning cross section.

29. 发明专利

JPH11143181A ELECTRIFIER 失效
公开(公告)号：JPH11143181A
公开(公告)日：1999-05-28
申请号：JP30574097
申请日：1997-11-07
申请人： CANON KK
发明人： SATO HIROSHI
IPC分类号： G03G15/02
摘要： PROBLEM TO BE SOLVED: To enable excellent electrification, even if an electrifying roller is permanently deformed by making the response time of control with a constant current longer than the time to pass a nip width formed between the electrifying roller and a body to be electrified, in their stationary states, through the electric discharge region between the electrifying roller and the body to be electrified. SOLUTION: A electrifying bias of a vibrating voltage constituted in such a manner that an AC voltage as a vibrating component is superimposed on a DC voltage as a fixing component is applied from a power source 10 to the electrifying roller 4 through a core metal 4a. Then, the response time of the control with the constant current is set longer than the time to pass a part. (n) deformed by the permanent deformation of the electrifying roller 4, through the discharge region. Thus, even if the electrifying roller 4 is permanently deformed, the peak-to-peak voltage value (AC voltage value) of the vibrating component is never changed while the deformed part (n) passes through the discharge region, so that the excellent electrification can be attained.

30. 发明专利

JPH1131537A ELECTRIC POWER UNIT 失效
公开(公告)号：JPH1131537A
公开(公告)日：1999-02-02
申请号：JP18494097
申请日：1997-07-10
申请人： CANON KK
发明人： SATO HIROSHI
IPC分类号： H02J7/00 , H01M10/46
摘要： PROBLEM TO BE SOLVED: To provide a compact and convenient electric power unit, which can be carried and which has superior water resistance and which can be used on the liquid or under the liquid, at a low cost by providing superior airtightness and water resistant property. SOLUTION: A power source device is provided with a power source supplying source 1 and a control device 3, and an outer case of the power source supplying source 1 and an outer case of the control device 3 are integrally formed with each other, and the integrated outer case 2 is desirably formed into a water resistant structure and used in a condition such that it makes contacts with an arbitrary solution. In the electric power unit having the integrated outer case 2, specific gravity of the whole of the electric power unit is set smaller than that of the solution. Inside the outer case 2 a space is provided with for housing an arbitrary material, and a mechanism for filling the material into the space at need or/and a mechanism for discharging the material from the space are desirably provided.

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