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81. 发明专利

JPH1075367A IMAGE PROCESSING UNIT 失效
公开(公告)号：JPH1075367A
公开(公告)日：1998-03-17
申请号：JP1093997
申请日：1997-01-24
申请人： RICOH KK
发明人： SASAKI HIDEKAZU , MATSUSHIRO HIROYUKI
IPC分类号： B41J2/415 , B41J2/52 , 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 printer controller 51 applies pseudo gradation processing such as dot concentration or dot distribution multi-value dither processing to image data so as to reduce a data quantity, the resulting image data are stored in a frame memory, and then read and a gamma correction section 52 of the engine 54 applies gamma correction to the image data for each dot. In this case, the gamma correction section 52 references dots around a noted dot so as to discriminate an environment of the surrounding dots and selects any of a plurality of kinds of gamma correction data stored in an internal memory according to the result and sets a write level of a noted dot by using the selected gamma correction data and provides an output of a corresponding write signal to a write section 53.

82. 发明专利

JPH1071745A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH1071745A
公开(公告)日：1998-03-17
申请号：JP2182497
申请日：1997-02-04
申请人： RICOH KK
发明人： MATSUSHIRO HIROYUKI , SASAKI HIDEKAZU
IPC分类号： B41J2/52 , B41J2/44 , G06T5/00 , H04N1/405 , H04N1/407
摘要： PROBLEM TO BE SOLVED: To prevent the number of gradations of image data to be printed out from being reduced even when the data is subjected to γ correction and enable the regeneration of stable gradational properties. SOLUTION: A CPU for an engine 54 creates an image (an image is created by cutting a specified gradation part regarding some of patterns for γ correction) in its rotating direction on a recording medium using the plural patterns for γcorrection consisting of highlighted dots whose gradations are beforehand gradually varied by the number of writing dots around the highlighted dots, as gradation patterns respectively. In addition, each of the densities of the image is detected using an photosensor and the γ correction data is created based on the detection results. After that, a γ correction part 52 interprets the environment of the highlighted dots of image data subjected to simulated gradation process from a printer controller 51, referring to the surrounding dots. Further, based on the interpretation results, the γ correction part 52 selects either of the sets of the γcorrection data, and outputs an appropriate write level signal by correcting the gradations of the highlighted dots of the image data using the selected set of the γ correction data.

83. 发明专利

JPH09297449A COLOR IMAGE FORMING DEVICE 失效
公开(公告)号：JPH09297449A
公开(公告)日：1997-11-18
申请号：JP11263096
申请日：1996-05-07
申请人： RICOH KK
发明人： MATSUSHIRO HIROYUKI
IPC分类号： G03G21/14 , G03G15/01 , G03G15/16 , G03G21/00
摘要： PROBLEM TO BE SOLVED: To make the number of prints per unit hour at the time of executing consecutive printing larger most efficiently, while preventing the occurrence of a failure such as a horizontal streak on an image. SOLUTION: This device is constituted so as to provide a photoreceptor l, plural developing units 7, 22Y, 22M and 22C for developing latent images formed on the photoreceptor, an intermediate transfer body 10 to which toner images for each color formed on the photoreceptor 1 are primarily transferred in such a manner that the toner images are successively superimposed and a transfer member 14 for secondarily transferring the toner images on the intermediate transfer body 10 onto a transfer paper and a cleaning member 16A for removing toner remaining on the transfer body 10, after the transfer is performed. At this time, it is constituted so that the peripheral length of the transfer body 10 is longer than the sum of the length of a largest-sized transfer paper which can be outputted and the distance from a writing position 5A on the photoreceptor to a primary transfer position and at the time of consecutively printing color images, a print is outputted whenever four rotations of the transfer body 10 are made, on the basis of a bit of positional information 46 on the transfer body 10, as a reference.

84. 发明专利

JPH09292751A COLOR IMAGE FORMING METHOD AND COLOR IMAGE FORMING DEVICE 失效
公开(公告)号：JPH09292751A
公开(公告)日：1997-11-11
申请号：JP10218096
申请日：1996-04-24
申请人： RICOH KK
发明人： MATSUSHIRO HIROYUKI
IPC分类号： G03G21/14 , G03G15/01 , G03G15/16
摘要： PROBLEM TO BE SOLVED: To obtain a color image forming device which prevents adverse effect on image formation due to a change in load on an intermediate transfer body or photoreceptor by bringing a transfer member into contact with the intermediate transfer body after the primary transfer of the final impression and before the start of exposure for a first impression in the following printing. SOLUTION: The photoreceptor 1 is in contact with the external surface of the intermediate transfer belt 10. In this area, the primary transfer position E, the primary transfer is carried out. The intermediate transfer belt 10 is set so that a distance between the secondary transfer position F where a transfer roller 14 is in contact with the intermediate transfer belt 10 and the primary transfer position E, as a starting point, in the direction of the arrow B where the intermediate transfer belt 10 moves is equal to or longer than the length of the maximum outputtable-transfer-paper in the direction where the transfer paper is carried. After the entire fourth-impression toner-image is transferred onto the intermediate transfer belt 10 from the photoreceptive belt, transfer paper is moved from the position where the transfer roller 14 is apart from the intermediate transfer belt 10 to the position where it is in contact with the belt 10, and the secondary transfer is carried out.

85. 发明专利

JPH09185210A COLOR IMAGE FORMING DEVICE 失效
公开(公告)号：JPH09185210A
公开(公告)日：1997-07-15
申请号：JP35271995
申请日：1995-12-29
申请人： RICOH KK
发明人： MATSUSHIRO HIROYUKI , DEKI TAKESHI , MOTOHASHI TAKESHI , KIMURA NORIYUKI
IPC分类号： G03G21/14 , G03G15/01 , G03G15/08
摘要： PROBLEM TO BE SOLVED: To obtain a color image forming device which forms an image of high image quality. SOLUTION: A developing roller 23Y is so disposed as to rotate in the same direction as a moving direction of photoreceptor at a specific peripheral speed ratio with the photoreceptor belt 1. A color developing device 6 rotates round a center O, it is arranged downstream side of an optical writing position 5A in the direction of the rotation of the photoreceptor belt 1 and upstream side of a black developing unit and, further, in such a position that a distance from the optical writing position 5A is shorter than a distance obtained by subtracting the distance of the movement of the photoreceptor belt 1 during the color switch of the color developing device 6 from the distance of non-image formation obtained by subtracting the length of the maximum transfer paper, which can be outputted, from the length of the periphery of an intermediate transfer belt. By such arrangement and operation, the color developing device 6 can be rotated when an exposure process is not carried out, therefore it does not exert effect on the drive of the photoreceptor belt 1, and trouble, such a lateral streak, does not occur on an image.

86. 发明专利

JPH09154027A COLOR IMAGE FORMING DEVICE 失效
公开(公告)号：JPH09154027A
公开(公告)日：1997-06-10
申请号：JP33277395
申请日：1995-11-28
申请人： RICOH KK
发明人： SHINOHARA MASASHI , SASAKI HIDEKAZU , MATSUSHIRO HIROYUKI , SUGIYAMA MITSUGI , IRIE KOICHI
IPC分类号： B41J2/525 , B41J2/44 , G03G15/00 , G06T5/00 , H04N1/405 , H04N1/407 , H04N1/60
摘要： PROBLEM TO BE SOLVED: To provide a color image forming device with which high picture quality can be provided at low cost by performing image density prediction with high accuracy. SOLUTION: This device is provided with a dot pattern preparing part 29 for preparing the dot pattern of N×M matrix (N and M are natural numbers >=1) on a photosensitive body 1 and a photosensor 34 for detecting the density of dot pattern. Corresponding to the detection value of dot pattern detected by this photosensor 34, the density of articulate image is predicted by a toner density calculation part 30 and various process setting conditions are changed. Then, based on the detection value of dot pattern of arbitrary A×B matrix (A and B are natural numbers >=1) due to the photosensor 34, image density is predicted and γ correction is performed. In the case of process control execution, both the dot pattern and the articulate pattern are formed, and density prediction is performed by correlating the results of respective detection values due to the photosensor 34.

87. 发明专利

JPH0990743A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH0990743A
公开(公告)日：1997-04-04
申请号：JP27473995
申请日：1995-09-27
申请人： RICOH KK
发明人： UENO YUICHI , MATSUSHIRO HIROYUKI , KIMURA NORIYUKI , AOKI KATSUHIRO , MIYAO MAYUMI , FUJISHIRO TAKATSUGU
IPC分类号： G03G15/08
摘要： PROBLEM TO BE SOLVED: To provide an image forming device in which a developing unit replacement timing is extremely easily recognized. SOLUTION: An image forming device is equipped with an electrophotographic developing device in which a latent image formed on a photosensitive member is developed using one component developer. A developing device is equipped with a thinning layer 3 which is contact a developer support member 1 and uniformizes a developer layer on the developer support member 1, and the thinning layer 3 is composed of material wearing with the lapse of time by friction with the developer support member 1 and has a developing device life detection means M. The thinning layer 3 has such a double structure as using first material on a contacting side with the developer support member 1 and second material on a supporter side, and at least the first material may be composed of the material wearing with the lapse of time.

88. 发明专利

JPH0990699A COLOR IMAGE FORMING DEVICE 失效
公开(公告)号：JPH0990699A
公开(公告)日：1997-04-04
申请号：JP26634995
申请日：1995-09-20
申请人： RICOH KK
发明人： IRIE KOICHI , SASAKI HIDEKAZU , MATSUSHIRO HIROYUKI , SUGIYAMA MITSUGI , SHINOHARA MASASHI
IPC分类号： G03G15/00 , G03G15/01 , G03G21/00 , H04N1/46 , H04N1/60
摘要： PROBLEM TO BE SOLVED: To always output a stable high-quality image without being influenced by the change of environment by using output values obtained till the saturation of output from a photosensor so that stable output value may be obtained in a wide range, accurately measuring toner density, predicting image density based on the measured result and adjusting the conditions of process. SOLUTION: An image developing unit 2 is controlled by a control unit 3 based on the output from a temperature and humidity sensor 8 constituting the unit 2. After writing and developing N×M dots of matrix pattern on a photoreceptor drum 4 constituting the unit 2, the toner density of the matrix pattern is measured by the photosensor 9 constituting the unit 2, and the image density in the case of actually printing the image is predicted based on the measured result and the conditions of the process are adjusted.

89. 发明专利

JPH0980902A DEVELOPING DEVICE 失效
公开(公告)号：JPH0980902A
公开(公告)日：1997-03-28
申请号：JP26479095
申请日：1995-09-18
申请人： RICOH KK
发明人： MIYAO MAYUMI , MATSUSHIRO HIROYUKI , KIMURA NORIYUKI , AOKI KATSUHIRO , UENO YUICHI , FUJISHIRO TAKATSUGU
IPC分类号： G03G15/08
摘要： PROBLEM TO BE SOLVED: To provide a developing device where a toner layer formed on a developing roller is uniformized by preventing the sticking of toner or the like on a thin layer blade without affecting image quality. SOLUTION: This developing device which is provided with plural developing units 20 having the thin layer blade 23 controlling the thickness of the toner layer supplied on the front surface of the developing roller 21 and performs developing by rotating and moving an arbitrary developing unit out of the plural developing units 20 to a developing position opposite to a photoreceptor belt 2 is provided with a vibration imparting means imparting vibration to the thin layer blade 23 when the developing unit 20 is rotated and moved. The vibration imparting means is composed of a bias power source 23a applying AC voltage to the thin layer blade 23 and a controller 100. Also, it may be constituted of an ultrasonic vibrator provided so as to be brought into contact with the thin layer blade 23 and a driving controller.

90. 发明专利

JPH08202128A DEVELOPING DEVICE 失效
公开(公告)号：JPH08202128A
公开(公告)日：1996-08-09
申请号：JP3140195
申请日：1995-01-27
申请人： RICOH KK
发明人： MATSUSHIRO HIROYUKI , AOKI KATSUHIRO , KIMURA NORIYUKI , UENO YUICHI , FUJISHIRO TAKATSUGU , KOBAYASHI CHIYAKO
IPC分类号： G03G15/06 , G03G15/08
摘要： PURPOSE: To reduce the quantity of developer stuck to the surface part of an image carrier, while improving the suppliability of the developer by making a developing bias voltage, a supplying bias voltage, etc., into the same polarity and satisfying a specific relation. CONSTITUTION: The developing bias voltage VB, the supplying bias voltage VSP and a bias voltage Vb1 have the same polarity and when a developing device is one for attaining normal development, the developing device satisfies |Vb1 |+100

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