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1. 发明专利

JP2002132010A COLOR IMAGE FORMING DEVICE 审中-公开
公开(公告)号：JP2002132010A
公开(公告)日：2002-05-09
申请号：JP2001277822
申请日：2001-09-13
申请人： RICOH KK
发明人： SASAKI HIDEKAZU , NOGUCHI KOICHI , SUZUKI MINORU , SAKAMOTO KOJI , MATSUSHIRO HIROYUKI , DEKI TAKESHI , KIMURA NORIYUKI , FUJISHIRO TAKATSUGU , HATSUYAMA CHIYAKO
IPC分类号： G03G21/14 , G03G15/01 , G03G15/16
摘要： PROBLEM TO BE SOLVED: To provide a color image forming device in which color slippage due to the eccentricity of a driving roller is solved. SOLUTION: This color image forming device possesses a positional information detecting means for detecting positional information displayed on only an intermediate transfer belt, and start timing for carrying a latent image to a belt type photoreceptor is set, based on the detected information of the positional information by the positional information detecting means.

2. 发明专利

JPH1075368A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH1075368A
公开(公告)日：1998-03-17
申请号：JP2180897
申请日：1997-02-04
申请人： RICOH KK
发明人： SASAKI HIDEKAZU , MATSUSHIRO HIROYUKI
IPC分类号： B41J2/415 , B41J2/44 , B41J2/45 , B41J2/455 , B41J2/52 , G03G15/00 , G06T5/00 , H04N1/405 , H04N1/407
摘要： PROBLEM TO BE SOLVED: To reproduce stable gradation by avoiding gradation number of printed-out image data from being decreased even in the case of making gamma correction. SOLUTION: A CPU of an engine 54 forms an image a plurality of correction patterns where gradation of a noted dot is gradually changed by write dot number around the noted dot in advance onto a recording medium as gradation patterns, each density is detected by using an optical sensor and gamma correction data are generated by the write dot number, based on the detection result. Then a gamma correction section 52 references dots around the noted dot of image data applied with pseudo gradation processing from a printer controller 51 to discriminate the environment and any of the gamma correction data is selected depending on the discrimination result and the gamma correction data are used to correct the gradation of the noted dot of the image data to provide an output of a corresponding write level signal.

3. 发明专利

JPH1075357A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH1075357A
公开(公告)日：1998-03-17
申请号：JP2181297
申请日：1997-02-04
申请人： RICOH KK
发明人： MATSUSHIRO HIROYUKI , SASAKI HIDEKAZU
IPC分类号： B41J2/52 , G03G15/00 , G06T5/00 , H04N1/405 , H04N1/407
摘要： PROBLEM TO BE SOLVED: To reproduce stable gradation by avoiding gradation number of printed-out image data from being decreased even in the case of making gamma correction. SOLUTION: A CPU of an engine 54 forms an image a plurality of correction patterns where gradation of a noted dot is gradually changed by write dot number around the noted dot in advance onto a recording medium as gradation patterns in different turning directions, each density is detected by using an optical sensor and gamma correction data are generated by the write dot number, based on the detection result. Then a gamma correction section 52 references dots around the noted dot of image data applied with pseudo gradation processing from a printer controller 51 to discriminate the environment and any of the gamma correction data is selected depending on the discrimination result and the gamma correction data are used to correct the gradation of the noted dot of the image data to provide an output of a corresponding write level signal.

4. 发明专利

JPH0980880A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH0980880A
公开(公告)日：1997-03-28
申请号：JP26222595
申请日：1995-09-15
申请人： RICOH KK
发明人： AOKI KATSUHIRO , MATSUSHIRO HIROYUKI , KIMURA NORIYUKI , UENO YUICHI , FUJISHIRO TAKATSUGU , MIYAO MAYUMI
IPC分类号： G03G15/01 , G03G15/06
摘要： PROBLEM TO BE SOLVED: To prevent the occurrence of a residual image by making residual charges on a developing roller uniform even right after the consecutive development of solid images, and preventing the characteristics of a toner layer formed in a part where toner is consumed from differing from a part where it is not consumed. SOLUTION: A printer is provided with a developing roller 52 facing a photoreceptive belt 2, a supply roller 53 for supplying toner to the developing roller 52, a blade 54 for regulating the thickness of a toner layer on the developing roller 52 in pressure contact with the surface of the developing roller 52, a discharge brush 55 whose conductive part abuts on the surface of the developing roller 52 downstream in a developing area in a circulation path and on the upstream side from the position where it faces the supply roller 53, and a power source 61 for applying a voltage to the conductive part of the discharge brush 55, and it is also provided with a developing device for developing a latent image on the photoreceptive belt 2 with the toner thin layer on the developing roller 52. In this printer, as the voltage which is to be applied to the conductive part of the discharge brush 55, a voltage in which AC voltage overlaps DC voltage is used.

5. 发明专利

JPH08227211A DEVELOPING DEVICE 失效
公开(公告)号：JPH08227211A
公开(公告)日：1996-09-03
申请号：JP5795595
申请日：1995-02-21
申请人： RICOH KK
发明人： UENO YUICHI , MATSUSHIRO HIROYUKI , AOKI KATSUHIRO , KIMURA NORIYUKI , FUJISHIRO TAKATSUGU , KOBAYASHI CHIYAKO
IPC分类号： G03G15/01 , G03G15/06 , G03G15/08
摘要： PURPOSE: To obtain a developing device capable of attaining excellent development with a thin and uniform developer layer formed by applying an alternating electric field to a blade for regulating the quantity of developer on a developing roller and quickly restoring the quantity of the developer on the roller with predriving. CONSTITUTION: At the time of nondeveloping, the developing roller 23 is prerotated by using a DC blade bias voltage as a blade bias voltage applied to a thin layer blade 25 by bias supply 25a, to quickly restore a toner layer on the surface of the roller 23. At the time of developing, the development is attained by using a blade bias voltage consisting of DC and AC components as the blade bias voltage. Thus, staining on the surface part, of a photoreceptor belt 1 is suppressed by the photoreceptor belt surface part staining suppressing work, to enable the excellent development.

6. 发明专利

JPH0876580A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH0876580A
公开(公告)日：1996-03-22
申请号：JP23960594
申请日：1994-09-06
申请人： RICOH KK
发明人： FUJISHIRO TAKATSUGU , MATSUSHIRO HIROYUKI , KIMURA NORIYUKI , AOKI KATSUHIRO , UENO YUICHI , KOBAYASHI CHIYAKO
IPC分类号： G03G15/01 , G03G15/08
摘要： PURPOSE: To prevent the leakage of toner even when a cartridge is attached/ detached to/from the device in the state the opening of a hopper faces downward by providing the openings of the toner hopper and toner cartridge of a rotary developing device with shield members whose openings are opened only when the cartridge is loaded into the hopper. CONSTITUTION: The shield members 54Y and 46Y to which the opening 53Y of the toner cartridge 50Y and the opening 45Y of the hopper 40Y are energized respectively so as to cover them at all times are slidably attached to the corresponding openings. When the cartridge is inserted to be loaded into the hopper, the shield member 54Y of the cartridge strikes against the part K of the hopper, and the shield member 46Y of the hopper strikes against the part L of the cartridge. When it is inserted further, each shield member slides against the energization, so that the openings 45Y and 53Y are opened.

7. 发明专利

JPH06337582A ROTARY TYPE DEVELOPING DEVICE 失效
公开(公告)号：JPH06337582A
公开(公告)日：1994-12-06
申请号：JP12756093
申请日：1993-05-28
申请人： RICOH KK
发明人： AOKI KATSUHIRO , SAKAI TOSHIO , MATSUSHIRO HIROYUKI , KIMURA NORIYUKI , NAMEKATA SHINICHI , UENO YUICHI , HATSUYAMA CHIYAKO
IPC分类号： G03G15/01 , G03G15/08 , G03G21/00 , G03G21/10
摘要： PURPOSE:To make it possible to recover toner from a toner supply roller without increasing the size of a developing unit by bringing a toner recovering screw into contact with the toner supply roller when the developing unit is not in a developing position. CONSTITUTION:The shaft 28a of a toner recovering roller 28 is fitted in a long hole 28A. A gear 28b is fixed to the shaft 28a, and when the developing unit 22Y is in the developing position, the gear 28b engages with a gear 28B used for driving the toner recovering roller and is driven by the gear 28B, thereby rotating the toner recovering screw 28. When being in the uppermost position in the developing unit, the toner recovering screw 28 moves down by gravity while restricted by the long hole 28A, so that it comes into pressure- contact with the periphery of the toner supply roller 25. The gears 28b and 28B are disengaged from each other by this movement, so that the toner recovering screw 28 is separated from a driving source, and rotates while following the rotation of the toner supply roller 25.

8. 发明专利

JPH06308798A ELECTROPHOTOGRAPHIC COPYING DEVICE 失效
公开(公告)号：JPH06308798A
公开(公告)日：1994-11-04
申请号：JP9768893
申请日：1993-04-23
申请人： RICOH KK
发明人： MATSUSHIRO HIROYUKI , SAKAI TOSHIO , KIMURA NORIYUKI , AOKI KATSUHIRO , NAMEKATA SHINICHI , UENO YUICHI , HATSUYAMA CHIYAKO
IPC分类号： B41J2/525 , G03G15/00 , G03G15/01 , G03G15/16 , G03G21/00 , G03G21/10 , G03G21/14
摘要： PURPOSE:To prevent a toner heap formed on an intermediate transfer belt from entering an image area, to minimize a time-lag till the start of writing by a simpler device and to shorten the time required for printing. CONSTITUTION:In an electrophotographic copying device provided with an endless intermediate transfer belt 10 transferring and carrying a toner image on a photosensitive body 1 and a cleaning device eliminating toner left on the belt 10 after the toner image is transferred on a transfer medium from the belt 10; the plural pieces of positional information are provided in the circumferential direction of the belt 10 and a gap between the respective positional information 41A-41F and the adjacent positional information thereto in the circumferential direction is set to be shorter than the length of the circumferential direction of a non-image part formed on the belt 10.

9. 发明专利

JPH04220682A METHOD OF STOPPING BELT IN IMAGE FORMATION DEVICE 失效
公开(公告)号：JPH04220682A
公开(公告)日：1992-08-11
申请号：JP40496490
申请日：1990-12-21
申请人： RICOH KK
发明人： MATSUSHIRO HIROYUKI , TAKEDA FUCHIO , TAKATANI TOSHIHIKO , SUGIYAMA TOSHIHIRO , KARASHIMA KENJI
IPC分类号： G03G21/00 , G03G21/14
摘要： PURPOSE:To prevent the centralization of a stop position of a potential holder belt 1 after the operation of image operation into one point, and the tendency of curvature in the potential image holder belt 1 due to support rollers 2, 3, 4. CONSTITUTION:The running length of a potential image holder belt 1 is controlled so that stop positions may differ from each other before and after the operation of image formation.

10. 发明专利

JPH04215685A CLEANING DEVICE 失效
公开(公告)号：JPH04215685A
公开(公告)日：1992-08-06
申请号：JP41092390
申请日：1990-12-14
申请人： RICOH KK
发明人： MATSUSHIRO HIROYUKI , TAKEDA FUCHIO , TAKATANI TOSHIHIKO , SUGIYAMA TOSHIHIRO , KARASHIMA KENJI
IPC分类号： G03G21/00 , G03G21/10
摘要： PURPOSE:To reduce the mechanical pressing force to a photosensitive belt to extend the life of an image carrier and keep the machine from dirt caused by a toner accumulated at a pressure section between a cleaning member and the image carrier when the latent image carrier is exchanged. CONSTITUTION:The surface of the cleaning roller 20 of a cleaning device 10 is finely magnetized at an interval about 1.3mm in the peripheral direction, and its peak magnetic force is about 250G. The action of the cleaning roller 20 to attract a toner via the magnetic force can be used for cleaning, and the mechanical pressing force can be reduced. The magnetic toner is removed from the contact section with a photosensitive member, and no toner is accumulated and stuck on the contact section. When the base of a photosensitive belt 1 is made of a ferromagnetic substance, for example, the attracting force to the cleaning roller 20 is increased, and the contact between both of them is made sure and uniform.

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