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31. 发明专利

JP2001061039A IMAGE READER AND IMAGE READ METHOD 失效
公开(公告)号：JP2001061039A
公开(公告)日：2001-03-06
申请号：JP23526999
申请日：1999-08-23
申请人： CANON KK
发明人： SAITO TETSUO
IPC分类号： H04N1/04 , G06T1/00
摘要： PROBLEM TO BE SOLVED: To obtain an image reader that stably reads an image by preventing missing of image reading and 2nd reading of the image even when a backlash of a gear is increased due to a change over aging. SOLUTION: The total number of carried originals to be stored is read (S301), the number of read lines when a stepping motor is stopped (stop of carrying original) and the number of image reading skipped lines when the stepping motor is started (start of carrying original) are selected so as to increase the number of lines on the basis of the total number of carrying originals such as K=1 when the total number of carrying original is less than 5,000 (S303), K=2 when the total number of carrying originals is 5,000 or over and 10,000 or below (S304) and K=3 when the total number of carrying originals is in excess of 10,000 (S305). Thus, even when a backlash of a gear is increased due to a change over aging, missing of reading of an image of the original and 2nd reading of the original can be prevented to attain stable image reading.

32. 发明专利

JP2000203723A SHEET FEEDER AND PICTURE FORMING DEVICE PROVIDED WITH THIS SHEET SUPPLY DEVICE 失效
公开(公告)号：JP2000203723A
公开(公告)日：2000-07-25
申请号：JP584999
申请日：1999-01-12
申请人： CANON KK
发明人： SAITO TETSUO
IPC分类号： B65H1/08 , B65H3/46 , G03G15/00
摘要： PROBLEM TO BE SOLVED: To remove adhering matter sticking to a sheet, in a sheet supply device. SOLUTION: This sheet feeder 101 comprises a sheet loading means 51 loading a sheet, sheet feed means 40 feeding a sheet 5 from the sheet loading means 51, sheet lift means 16 lifting the sheet loaded in the sheet loading means 51, and adhering matter removing means 17, 18 provided in an end part of the upstream/downstream end parts in a sheet feed direction of the sheet loading means 51 to come into contact with an end part of the sheet, to remove adhering matter sticking to the end part of the sheet by lifting it.

33. 发明专利

JPH11161041A IMAGE FORMING METHOD AND DEVICE 失效
公开(公告)号：JPH11161041A
公开(公告)日：1999-06-18
申请号：JP32809397
申请日：1997-11-28
申请人： CANON KK
发明人： SAITO TETSUO
IPC分类号： G03G15/01 , G03G15/16
摘要： PROBLEM TO BE SOLVED: To obtain an image forming method for making the fog of a transfer material inconspicuous, at the time of winding the transfer material on a transfer drum, so as to form an image with a multitransfer by forming the image, so as to make the end part side of the transfer material held with a transfer material holding means, the bottom end of the image. SOLUTION: An image part 17 surrounded by a frame (a) is formed on the transfer material 5. On the top end X in a carrying direction of the transfer material 5 as a part where the transfer material holding means holds the transfer material 5, normally, the image part 17 is formed in a state where a top end margin of 10 mm is left. This margin is a dimension required for holding the transfer material 5 by the transfer material holding means. At the left, right and bottom ends, margins of 5 mm are formed respectively. Then, the image is formed to turn the image part 17 upside down. In other words, the image is formed so that an image-untransfered part in a transfer material holding means position at the time of performing the multitransfer becomes the bottom end of the image, so that the fog is hardly inconspicuous for a user and he or she hardly recognizes that there is a fog.

34. 发明专利

JPH1115337A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH1115337A
公开(公告)日：1999-01-22
申请号：JP16365497
申请日：1997-06-20
申请人： CANON KK
发明人： SAITO TETSUO
IPC分类号： G03G21/00 , G03G15/16 , G03G21/16
摘要： PROBLEM TO BE SOLVED: To detect whether an image carrier body built in a process cartridge is installed in an image forming device main body or not earlier than detection by a conventional detection method. SOLUTION: In an image forming device comprising an image carrier body on which a toner image is formed by an electrophotographic process and a transfer means to transfer the toner image to a transfer material, voltage is applied to the transfer means by a transfer voltage-applying means, the transfer voltage V0, V1 at prescribed time T0, T1 are detected (S05, S07), the difference of the voltage at the prescribed time interval is compared with a previously determined set value by a comparison means, and the presence of a photoreceptor is judged (S09) based on the result of the comparison means.

35. 发明专利

JPH10226434A SHEET FEED ROLLER AND IMAGE FORMING DEVICE 失效
公开(公告)号：JPH10226434A
公开(公告)日：1998-08-25
申请号：JP3053197
申请日：1997-02-14
申请人： CANON KK
发明人： SAITO TETSUO
IPC分类号： G03G15/00 , B65H3/06
摘要： PROBLEM TO BE SOLVED: To properly feed sheets of different surface conditions, including plane paper sheets and coated paper sheet with higher smoothness, according to the surface conditions with the use of a sheet feed roller for feeding sheets. SOLUTION: A sheet feed roller 15 comprises a sheet feed roller body 15a having a contact surface adapted to contact with sheets and a roller shaft 16, and a fluid cylinder 20 for applying pressure to the shaft by means of a spring 18. The cylinder increases the contact pressure of the roller body to coated paper sheets to prevent the roller body from slipping on the sheets and decreases that to plane paper sheets with lower smoothness to prevent the roller body from damaging the sheets, with the result that both sheets are properly fed.

36. 发明专利

JPH1096897A LIQUID CRYSTAL ELEMENT, ITS PRODUCTION AND LIQUID CRYSTAL DISPLAY DEVICE HAVING THIS LIQUID CRYSTAL ELEMENT 失效
公开(公告)号：JPH1096897A
公开(公告)日：1998-04-14
申请号：JP20610097
申请日：1997-07-31
申请人： CANON KK
发明人： MIHARA TADASHI , TSUJITA CHIKAKO , MORI SUNAO , SAITO TETSUO , KOMURA AKIHIKO
IPC分类号： G02F1/1339 , G02F1/133 , G09F9/30
摘要： PROBLEM TO BE SOLVED: To eliminate display unevenness based on temp. distribution within a liquid crystal element plane. SOLUTION: Liquid crystals 15 exhibiting a chiral smectic phase are held between a pair of substrates 11a and 11b which respectively have electrodes 12a, 12b and are disposed to face each other apart a gap of a prescribed length. This element has at least a section connected with a driving circuit 40 for supplying voltage for liquid crystal driving to the electrodes 12a, 12b. The gap is made smaller as the distance from at least one side of the sides connected with this driving circuit 40 increases.

37. 发明专利

JPH09269631A ELECTRIFIER AND IMAGE FORMING DEVICE THEREWITH 失效
公开(公告)号：JPH09269631A
公开(公告)日：1997-10-14
申请号：JP7915196
申请日：1996-04-01
申请人： CANON KK
发明人： SAITO TETSUO
IPC分类号： G03G15/02 , G03G21/00 , G03G21/18
摘要： PROBLEM TO BE SOLVED: To make the time when toner is used up almost coincide with the end of the life of a photoreceptive drum by preventing the case where photoreceptive drum reaches the end of its life even though toner is still left in a process cartridge, resulting from a reduced amount of toner which is attached for trial printing. SOLUTION: The surface of the photoreceptive drum 13a in the process cartridge 13 is electrified by applying an electrifying member 28 an electrification voltage. In trial printing, an amount of toner to be attached is small, therefore the electrification voltage to be applied to the electrifying member 28 by means of a CPU 16, low-pass filter 20, amplifier 21, transformer 22, and so on is reduced to match the amount, thereby reducing damage to the photoreceptive drum 13a. Thus, the life of the photoreceptive drum 13a is extended, and the end of its life is made to coincide with the time when the toner is used up. This prevents the toner and photoreceptive drum 13a from becoming useless due to the replacement of the process cartridge 13.

38. 发明专利

JPH09218633A PROCESS CARTRIDGE AND ELECTROPHOTOGRAPHIC IMAGE FORMING DEVICE 失效
公开(公告)号：JPH09218633A
公开(公告)日：1997-08-19
申请号：JP2516196
申请日：1996-02-13
申请人： CANON KK
发明人： WADA ATSUSHI , SUZUKI EISHIN , MUKAIDAKA OSAMU , SAITO TETSUO
IPC分类号： G03G21/00 , G03G21/18 , G03G21/20
摘要： PROBLEM TO BE SOLVED: To carryout highly reliable recording without using especially a heat radiating member even in the case of a high temperature by detecting the temperature of a process cartridge and altering recording conditions according to the temperature. SOLUTION: A thermister 15 is mounted in the process cartridge B, and temperature in the cartridge can be detected by detecting a voltage in the position of a detection contact 18. Thermister voltage information outputted from the detection contact 18 is converted into a digital value by an A/D conversion means in a control part, a recording medium is carried with recording- medium carrying timing according to the value, and an image is formed. Since when the temperature of the cartridge becomes high, the number of sheets on which recording is carried out is reduced and heat radiating time is sufficiently obtained, toner deterioration such as toner fusion due to the temperature increase is prevented. Therefore, even in an image-forming device provided with no fan and small in size, an image high in quality can be obtained at all times without causing any degradation of image quality.

39. 发明专利

JPH09218615A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH09218615A
公开(公告)日：1997-08-19
申请号：JP2413996
申请日：1996-02-09
申请人： CANON KK
发明人： MUKAIDAKA OSAMU , SUZUKI EISHIN , WADA ATSUSHI , SAITO TETSUO
IPC分类号： B41J2/44 , G03G15/00 , G03G21/00 , H04N1/23
摘要： PROBLEM TO BE SOLVED: To prevent degradation of the quality of an image to be formed and recorded on a recording medium by increasing the driving torque of a motor in accordance with a photoreceptor drum condition and print-sample image condition. SOLUTION: The driving torque of a cartridge increases with a decrease in amount of remaining toner. When the number of used sheets of the cartridge is small, the optimum rotation of the motor is realized with the ordinary driving torque of the motor, low driving torque. When the number of sheets reaches up to a fixed number, the driving torque is increased. That is, the driving torque of the motor is determined so as to be matched with the life of the cartridge, and the driving torque of the motor is decreased when the number of prints is small. To decrease the driving torque of the motor, the output duty of an operation amplifier 33 is made small by boosting the D/A output of a CPU 31. Thus, the ON-time of the transistor 34 is shortened and the driving torque of the motor 35 is decreased.

40. 发明专利

JPH09197734A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH09197734A
公开(公告)日：1997-07-31
申请号：JP2611196
申请日：1996-01-19
申请人： CANON KK
发明人： SAITO TETSUO
IPC分类号： G03G15/00 , G03G15/01 , G03G15/16
摘要： PROBLEM TO BE SOLVED: To perform electrophotographic process control, such as transfer control, under optimum conditions meeting the degree of the moisture absorption of a transfer material, and to obtain a satisfactory image free of a transfer defect, etc. SOLUTION: A length sensor 15 is set on the upstream side from a transfer drum 7 in the direction where the transfer material 5 is carried from a sheet feed cassette 4 to a transfer drum 7. The length of the transfer material in the direction it is carried, is detected to find its shrinkage degree in the direction of its length. From the shrinkage degree of the transfer material the degree of the moisture absorption of the transfer material is judged, and a transfer bias which is applied to the transfer drum 7 is controlled in the optimum conditions which matches with the degree of the moisture absorption of the transfer material 5.

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