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91. 发明专利

JPH1138853A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH1138853A
公开(公告)日：1999-02-12
申请号：JP20386897
申请日：1997-07-14
申请人： RICOH KK
发明人： KURENUMA TAKEROU , TAKAHASHI SADAO , SUDA TAKEO , TANAKA MASARU
IPC分类号： G03G21/10 , G03G15/00
摘要： PROBLEM TO BE SOLVED: To suppress noise or chatter caused by stick slippage between a cleaning means and an image carrier rotating while sliding on the cleaning means and to form an image in pleasant environment by specifying the attenuation factor of vibration noise caused by the stick slippage between the cleaning means and the image carrier. SOLUTION: The attenuation factor of the vibration caused by the stick slippage between a cleaning blade 6a and a photoreceptor drum 1 is set to >=1.6. Then, an insertion body 1b being a heavy object made of aluminum or brass material worked like a column which is 100 mm in length is attached to the inside of a cylinder 1a which is

92. 发明专利

JPH113017A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH113017A
公开(公告)日：1999-01-06
申请号：JP17103597
申请日：1997-06-12
申请人： RICOH KK
发明人： TAKAHASHI SADAO
IPC分类号： G03G21/10 , G03G15/08
摘要： PROBLEM TO BE SOLVED: To provide an image forming device which is small-sized, whose cost is low and which forms an image having excellent image quality by preventing the occurrence of a partially white void image that is so-called the firefly of a black solid part by deteriorating a transfer ratio by a coarse foreign matter such as the flocculated toner of recovered toner whose particle size is made large by being overheated and that is recovered by a cleaning means and is carried to a developing means as gaseous mixture with gas by a gas flow transferring means or paper powder or the like. SOLUTION: This device possesses a gas supplying means 5 supplying the gas to fluidize toner transferred by the gas flow transferring means 4 moving the recovered toner recovered by the cleaning means and changing it into the gaseous mixture, a connection aperture part 7 formed at the midway of a gaseous mixture carrying path 6 and having an aperture that is larger than the inside diameter of the gaseous mixture carrying path, a storing means 8 connected to the connection aperture part in a communicating state and storing the foreign matter such as the flocculated toner in the gaseous mixture or the paper powder or the like, an exhausting means 10 exhausting only the gas to outside by separating the recovered toner from the gaseous mixture carried through the gaseous mixture carrying path and a controlling means 19. Then, the flow speed of the gaseous mixture carried through the gasous mixture carrying path is adjusted by the controlling means 19, so that the foreign matter such as the focculated toner or the paper powder or the like is selected from the gasous mixture and is stored at the inside of the storing means 8 through the connection aperture part 7.

93. 发明专利

JPH10215382A COLOR IMAGE PROCESSING UNIT 失效
公开(公告)号：JPH10215382A
公开(公告)日：1998-08-11
申请号：JP1547397
申请日：1997-01-29
申请人： RICOH KK
发明人： TAKAHASHI SADAO , OUCHI SATOSHI
IPC分类号： H04N1/60 , G06T1/00 , G06T7/00 , G06T11/60 , H04N1/48
摘要： PROBLEM TO BE SOLVED: To discriminate colored characters in an original with high accuracy. SOLUTION: A colored character detection means 1 detects colored characters from a color image signal in the case of preliminary scanning. A frequency detection means 2 calculates a frequency of colored characters in all images by dividing an area of a domain detected as the colored characters with a total area of image data. A parameter selection means 3 selects a parameter corresponding to the frequency. A chromatic achromatic discrimination means 4 discriminates a chromatic achromatic domain of the image data obtained in the case of the main scanning by using the parameter selected in the case of the preliminary scanning.

94. 发明专利

JPH1097158A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH1097158A
公开(公告)日：1998-04-14
申请号：JP27306896
申请日：1996-09-24
申请人： RICOH KK
发明人： SUDA TAKEO , TANAKA MASARU , TAKAHASHI SADAO , KURENUMA TAKEROU
IPC分类号： G03G21/00
摘要： PROBLEM TO BE SOLVED: To inhibit the vibration of an image carrying drum caused by the vibration of an image forming element coming into press-contact with the image carrier drum, for suppressing an abnormal sound generated from the image carrying drum by fixedly arranging a weight in the image carrying drum and setting the weight of the image carrying drum and the weight, so as to satisfy specific conditions. SOLUTION: The weight 26 whose outside diameter is slightly smaller than the inside diameter of a photoreceptor drum 7 is used and fixed on the inner periphery of the drum 7 by an adhesive 27. The weight 26 is fixedly arranged in the image carrier drum of such a drum 7. When the weight of the image carrying drum is defined as W1 and the weight 26 is defined as W2 , the weight W1 and the weight W2 are set to satisfy W2 /W1 >=1. Thus, the vibration is transmitted from a cleaning blade, but the total weight is increased by the weight 26 and the rigidity of the whole is increased as well, so that the vibration occurring in the drum 7 is suppressed to stop the generation of the abnormal sound.

95. 发明专利

JPH1063069A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH1063069A
公开(公告)日：1998-03-06
申请号：JP22294696
申请日：1996-08-23
申请人： RICOH KK
发明人： TAKAHASHI SADAO
IPC分类号： G03G15/02
摘要： PROBLEM TO BE SOLVED: To provide an image forming device which surely removes particles, for example toner, from an electrifying roller without damaging the electrifying roller and maintains satisfactory image quality. SOLUTION: In the image forming device having a photoreceptor 1 and the electrifying roller 2 for electrifying the photoreceptor 1 by rotating in contact with the surface of the photoreceptor 1, a cleaning roller 3 which rotates in contact with the electrifying roller 2 while following it is provided, and the roller hardness (by JIS - A type hardness meter) of the cleaning roller 3 is made smaller than the roller hardness (by JIS - A type hardness meter) of the electrifying roller 2.

96. 发明专利

JPH09312779A IMAGE READER 失效
公开(公告)号：JPH09312779A
公开(公告)日：1997-12-02
申请号：JP12662896
申请日：1996-05-22
申请人： RICOH KK
发明人： TAKAHASHI SADAO
IPC分类号： H04N1/60 , G06T1/00 , H04N1/48
摘要： PROBLEM TO BE SOLVED: To make the identification performance of all fluorescent colors compatible with the reproducibility of a general background part and a highlight color. SOLUTION: A digital signal converted by an A/D converter 2 is corrected by a shading correction circuit 5 based on a white reference stored in a white level memory 3 and a black reference stored in a black level memory 4. An image signal subjected to shading correction is given to a fluorescent color discrimination circuit 6, in which whether or not the signal has a fluorescent color is discriminated. An arithmetic circuit 7 applies a prescribed arithmetic operation to the image signal and provides an output depending on the discrimination result by the fluorescent color discrimination circuit 6 and a quantization circuit 8 quantizes an output signal from the arithmetic circuit 7.

97. 发明专利

JPH09191400A IMAGE PROCESSOR 失效
公开(公告)号：JPH09191400A
公开(公告)日：1997-07-22
申请号：JP138796
申请日：1996-01-09
申请人： RICOH KK
发明人： TAKAHASHI SADAO
IPC分类号： H04N1/40 , G06T7/60 , G06T9/20
摘要： PROBLEM TO BE SOLVED: To detect characters with high accuracy by detecting characters based on the absolute density of picture elements as to an outer edge of the characters and detecting characters based on a density difference of picture element as to the inside of the character edge. SOLUTION: Circuits from an MTF correction circuit 1 to an AND circuit 8 are used to detect an outer edge of a character. The result is stored in an effective signal generating section 15. Circuits from differential circuits 9, 10 to a comparator 14 detect an inner edge of a character with processing density. A character area is decided and outputted based on an AND output of the comparator 14 and a valid signal generating section 15 and an output of an AND 8.

98. 发明专利

JPH08166705A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH08166705A
公开(公告)日：1996-06-25
申请号：JP25855395
申请日：1995-10-05
申请人： RICOH KK
发明人： TAKAHASHI SADAO , OTSUKA HIROHISA , TAWADA TAKAAKI
IPC分类号： G03G15/02
摘要： PURPOSE: To efficiently remove toner powder, sticking to the surface of a contact electrifying member, with the aid of a cleaning member by paying attention to a relation between the surface roughness of the contact electrifying member and the particle diameter of the toner powder sticking to the contact electrifying member. CONSTITUTION: This image forming device is equipped with the contact electrifying member 2, which electrifies the surface of an image carrier in contact with the surface, and the cleaning member, which cleans the surface 2a of the contact electrifying member 2 by sliding against the surface 2a, and it forms an electrostatic latent image on the electrified image-carrier, then supplies the toner powder 10 by the use of a developing means, to develop it and transfers the image to a transfer material. In such an image forming device, the maximum height of a projection and recess on the surface 2a of the contact electrifying member 2 is not greater than the average particle diameter d0 of the toner powder 10 which is supplied by the developing means.

99. 发明专利

JPH07298074A IMAGE PROCESSING UNIT 失效
公开(公告)号：JPH07298074A
公开(公告)日：1995-11-10
申请号：JP9126894
申请日：1994-04-28
申请人： RICOH KK
发明人： OUCHI SATOSHI , TAKAHASHI SADAO , NARAHARA KOICHI
IPC分类号： H04N1/52 , G06T7/00
摘要： PURPOSE:To discriminate an original automatically and to attain optimum processing for a type of the original by discriminating the type of the original at preliminary scanning and using a smoothing filter and an edge emphasis filter in matching the original. CONSTITUTION:A filter decision circuit 10 selects a coefficient of a smoothing filter 2 and an edge emphasis filter 4 based on discrimination information from an original type discrimination circuit 9. The selected coefficient is loaded to a coefficient table in the smoothing circuit 2 and the edge emphasis circuit 4 and the product sum of an input picture element and the coefficient table is implemented in 2nd and succeeding scanning. Then in the case of a model having the preliminary scanning mode the original type is discriminated in the preliminary scanning, and a spatial filter in matching with the discriminated original is used in making KCMY version. In the case of a model without the preliminary scanning, the original type is discriminated in the generation of a 1st version (K version) and the spatial filter in matching with the discriminated original is used in the succeeding CMY version. Thus, in the generation of K version, the smoothing filter and the edge emphasis filter are used.

100. 发明专利

JPH07170419A IMAGE PROCESSING SYSTEM 失效
公开(公告)号：JPH07170419A
公开(公告)日：1995-07-04
申请号：JP34313893
申请日：1993-12-14
申请人： RICOH KK
发明人： IMAO KAORU , OUCHI SATOSHI , TAKAHASHI SADAO
IPC分类号： B41J2/525 , H04N1/46 , H04N1/60
摘要： PURPOSE:To obtain high picture quality by reducing picture deterioration caused by delicate difference from pictures in each scanning in the processing of area sequential pictures. CONSTITUTION:This image processing system is provided with a color image read means 2 reading the image of an original and an image area separate means 3 separating an image area of color image data obtained from the read means 2, and output version data such as color version and black version are outputted in an area sequential way from image data whose image area is separated. The image area separate means 3 is provided with a character detection circuit 31 which has a black version image separate parameter and a color version image separate parameter and revises each parameter depending on each output version and separates image areas of character and pattern based on Y2, M2, C2 signals from the color image read means 2 by using the parameters, a white background detection circuit 32 receiving the Y2, M2, C2 signals and detecting a picture element area whose background is a white Level background, and an AND circuit 33 outputting an AND signal of output signals from the circuits 31, 32.

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