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1. 发明专利

JP2001066799A IMAGE-FORMING APPARATUS 失效
公开(公告)号：JP2001066799A
公开(公告)日：2001-03-16
申请号：JP2000191805
申请日：2000-06-26
申请人： RICOH KK
发明人： SAWAYAMA NOBORU
IPC分类号： G03G5/047 , G03B27/32 , G03B27/72 , G03G15/04 , G03G15/043
摘要： PROBLEM TO BE SOLVED: To prevent image blurring due to repulsion of electric charges which migrate in an electric charge transfer layer(CTL), ensure sufficient potential by electrification and attain satisfactory development, even if the CTL is made thin and an undercoat layer(UL) is made thick. SOLUTION: This image-forming device has at least a photoreceptor, an electrifying means, an image exposure means and a developing means, and part of light used for exposing an original by the image exposure means forms an image on the photoreceptor through an optical lens. The photoreceptor is a function separated photoreceptor having an undercoat layer(UL) 25, an electric charge generating layer(CGL) 31 and an electric charge transfer layer(CTL) 33 on the electrically conductive substrate 21, a thickness (Tctl) of the CTL is 20 μm or smaller and the Tct1 and the thickness (Tul) of the UL satisfy th relation Tu1>Tctl/3.

2. 发明专利

JPH10239956A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH10239956A
公开(公告)日：1998-09-11
申请号：JP4380497
申请日：1997-02-27
申请人： RICOH KK
发明人： KOYAMA HAJIME , SAWAYAMA NOBORU
IPC分类号： B41J2/44 , G03G15/04 , G03G15/043 , G03G21/00 , G03G21/06
摘要： PROBLEM TO BE SOLVED: To increase recording density by making the beam diameter of a laser beam with which a photoreceptor is irradiated in an electrophotographic process small. SOLUTION: The photoreceptor whose peak wavelength in spectral sensitivity is

3. 发明专利

JPH10181089A OPTICAL APPARATUS 失效
公开(公告)号：JPH10181089A
公开(公告)日：1998-07-07
申请号：JP34801696
申请日：1996-12-26
申请人： RICOH KK , RICOH OPTICAL IND CO
发明人： OSAWA YASUHIRO , SAWAYAMA NOBORU , UMEKI KAZUHIRO
IPC分类号： B41J2/44 , B41J2/45 , B41J2/455 , G03B27/50 , H04N1/04
摘要： PROBLEM TO BE SOLVED: To set an optical apparatus to a non-close contact type by reducing quantity- of-light irregularity and MTF irregularity, enhancing light utilizing efficiency, achieving miniaturization by the shortening of the focal point of an optical system and ensuring focal depth to enhance the tolerance degree of the alignment between the optical system and a light receiving surface. SOLUTION: A waveguide structure for guiding emitted light from a light emitting element array 2 to a light receiving surface 11 is realized by a waveguide structure 3 forming the light guide passage 4 optically cutting off the respective light emitting elements 1 of a light emitting element array 2 and a lens 7 positioned at the emitting end part of the light guide passage 4 is realized. Since the waveguide structures become the relation of 1:1 with respect to the respective light emitting elements 1, light emitting irregularity and MTE irregularity are hardly generated. Since light is condensed by the lens 7, resolving power and light utilizing efficiency are excellent. Since the lens 7 is small, an optical system is shortened in focal distance and the whole is miniaturized and focal depth is ensured to enhance the tolerance degree of alignment between the lens 7 and the light receiving surface 11. Since the lens 7 and the light receiving surface 11 are not brought to a close contact state, the contamination of the lens 7 or the damage of the light receiving surface 11 is prevented.

4. 发明专利

JPH1055112A DRY TYPE DEVELOPING DEVICE FOR IMAGE FORMING DEVICE 失效
公开(公告)号：JPH1055112A
公开(公告)日：1998-02-24
申请号：JP16331997
申请日：1997-06-05
申请人： RICOH KK
发明人： SAWAYAMA NOBORU , MARUTA TAKAYUKI , MIURA TETSUO
IPC分类号： G03G15/09
摘要： PROBLEM TO BE SOLVED: To prevent or reduce the generation of a line image not being in parallel with the advancing direction of a developer on a developing sleeve and the indented void of the end edge part of a solid image by specifying the center of the width of a magnetic pole in the peripheral direction of the develop ing sleeve and the direction of a magnetic field formed by the magnetic pole. SOLUTION: The center of the width of the magnetic pole (developing pole) P1 in the peripheral direction of the developing sleeve 4 is arranged to deviate to a part, nearer to the upstream side in the moving direction of the developer on the developing sleeve 4, than the nearest part (a place of a line l1 ) of the developing sleeve 4 to a latent image carrier consisting of a photoreceptor 1. The installation attitude of the magnetic pole P1 is set so that the magnetic field formed by the magnetic pole P1 is inclined toward a normal with respect to the periphery of the developing sleeve, passing through the center of the width of the magnetic pole P1 , that is, the best normal l2 , by an angle α in the advancing direction of the developer on the sleeve 4. By such a constitution, a line of magnetic force from the maximum magnetic force generating part, of the developing pole P1 is in the direction of a line l3 inclined by the angle α.

5. 发明专利

JPH06208297A DEVELOPING DEVICE 失效
公开(公告)号：JPH06208297A
公开(公告)日：1994-07-26
申请号：JP270593
申请日：1993-01-11
申请人： RICOH KK
发明人： SUGIHARA KAZUYUKI , TAKAMI NOBUO , SAWAYAMA NOBORU , MARUTA TAKAYUKI , YOSHIMATSU KAORU , YONEDA TAKUJI , NOJIMA KAZUO , WATABE KATSUJI
IPC分类号： G03G15/08
摘要： PURPOSE:To provide the developing device of simple constitution which can well agitate and mix the toners and carriers of a developer on a developing sleeve, has an agitating capacity as well and can make development with high image quality HR. CONSTITUTION:This developing device has the developing sleeve 8, an upper agitating screw 12, a lower agitating screw 14, a supply roller 6 and a makeup roller 5. This lower agitating screw 14 is disposed in proximity on the upper side of the developing sleeve 8 and a transporting roller 9 for transporting the developer upward is so provided as to have a central axis upper than the central axis of the lower agitating screw 14. In addition, the above-mentioned upper agitating screw 12 is disposed to have a central axis upper than the central axis of this transporting roller 9.

6. 发明专利

JPH06124044A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH06124044A
公开(公告)日：1994-05-06
申请号：JP29811592
申请日：1992-10-10
申请人： RICOH KK
发明人： MARUTA TAKAYUKI , SAWAYAMA NOBORU , TAKAMI NOBUO , SUGIHARA KAZUYUKI , NOJIMA KAZUO , YOSHIMATSU KAORU , WATABE KATSUJI , YONEDA TAKUJI
IPC分类号： G03G15/00 , G03G15/06 , G03G15/08 , G03G15/09
摘要： PURPOSE:To stably supply toner maintaining a bias difference (supply potential) constant in the case that developing bias is changed by some control. CONSTITUTION:The toner on a supply roller 29 is supplied to developer on a developing sleeve 25 by the bias difference by impressing the developing bias on the developing sleeve 25 and supply bias on the supply roller 29 in this image forming device. By considering the shift portion of the developing bias, a toner supply clutch is turned on and also the supply bias VHB is decided such as VHB=VB (target value) + VBS + VHp at the time of supplying the toner after the developing bias VB to be outputted is decided. Here, the VB is (target value), the VBS is the developing bias value, the VHp is supply potential previously decided and for example it is set at VHp=100v.

7. 发明专利

JPH06124041A IMAGE FORMING UNIT 失效
公开(公告)号：JPH06124041A
公开(公告)日：1994-05-06
申请号：JP29811692
申请日：1992-10-10
申请人： RICOH KK
发明人： TAKAMI NOBUO , SUGIHARA KAZUYUKI , MARUTA TAKAYUKI , NOJIMA KAZUO , SAWAYAMA NOBORU , YOSHIMATSU KAORU , WATABE KATSUJI , YONEDA TAKUJI
IPC分类号： G03G15/08 , G03G15/00 , G03G15/02 , G03G15/16 , G03G21/00 , G03G21/10
摘要： PURPOSE:To improve the workability of the insulation working on the peripheral surface and both end faces of the arbor roller of a toner replenishing roller for the purpose of preventing bias leakage via a developer. CONSTITUTION:The peripheral surface of the arbor roller 30 of the toner replenishing roller 3 is insulated by forming a rubber layer 31. Both end faces of the arbor roller 30 are insulated with insulating caps 23 which are press-fitted to shafts 32 so as to come into contact with these end faces. Both end faces are insulated with the insulating caps 23 in such a manner, and therefore, the rubber layer 31 is required to be formed only on the peripheral surface of the arbor roller 30. The arbor roller 30 is supported near the roller end faces of the shafts 32 in the working stage for forming the layer 31. The bending of the shafts is therefore less generated than in the case of supporting of the shaft parts of the roller 30 in the parts apart. from the end faces of the roller in the working stage. The yield is thus improved.

8. 发明专利

JPH0566654A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH0566654A
公开(公告)日：1993-03-19
申请号：JP4018692
申请日：1992-01-29
申请人： RICOH KK
发明人： HAYASHI KOJI , BISAIJI TAKASHI , KIKUCHI NORIMITSU , SEKINE TAKEYOSHI , SAWAYAMA NOBORU , MARUTA TAKAYUKI , MIURA TETSUO , SAKAUCHI KAZUNORI , YAMADA KAZUNARI , NAKAYAMA NOBUHIRO
IPC分类号： G01N21/47 , G03G15/00 , G03G15/01 , G03G15/06 , G03G15/08
摘要： PURPOSE:To prevent the degradation of image quality caused by a change in the resistance of a carrier, in an image forming device adopting a developing means executing development in such a manner that a two-component developer is used and a developing bias electric field having an alternating electric field on a developing region is formed. CONSTITUTION:The reference pattern of a reference density formed on a photosensitive drum 2 is developed by a developing device to form an actual image 46. The actual image 46 is detected by an optical sensor 37 opposite to the surface of the photosensitive drum 2. The measuring signal of the optical sensor 37 is displayed. When an edge emphasizing phenomenon occurs by the rising of resistance caused by the deterioration of the carrier in a developer, the minimum value of the measuring signal appears in the vicinities of both end parts of the actual image 46. At this time, a difference between the detection values of the densities of the central part and end part of the actual image 46 is calculated to detect the degree of edge emphasizing. When the edge emphasizing degree is out of a tolerance, a peak-to-peak voltage on the developing device is made high by a prescribed value.

9. 发明专利

JPH0345972A TONER IMAGE DENSITY DETECTING DEVICE IN IMAGE FORMING DEVICE 失效
公开(公告)号：JPH0345972A
公开(公告)日：1991-02-27
申请号：JP18042189
申请日：1989-07-14
申请人： RICOH KK
发明人： SAWAYAMA NOBORU
IPC分类号： G01N21/47 , G01N21/59 , G03G15/00 , G03G15/08
摘要： PURPOSE:To enhance the detecting sensitivity and detecting precision of a density detecting device especially when color toner is used by providing a diaphragm means composed of two stops shielding a part of light coming out of a light emitting element and specifying the diameters of the stops closer to and farther from the light emitting element. CONSTITUTION:The light emitting element 18 and a light receiving element 118 are fixed in a common case 33, notches 34 and 134 composing an optical path in parts facing respective convex lenses 22 and 122 are formed. At that time, the to and bottom ends of the notch 134 of the light receiving element 118 open, so that the stops 35 and 36 are formed and compose the diaphragm means. Where, the diameter of the stop 36 closer to the light receiving element 118 is D1; and the diameter of the stop 35 farther from the light receiving element 118, D2; D1

10. 发明专利

JPH01263665A DIGITAL IMAGE FORMING DEVICE 失效
公开(公告)号：JPH01263665A
公开(公告)日：1989-10-20
申请号：JP9295988
申请日：1988-04-15
申请人： RICOH KK
发明人： KUROKAWA JUNJI , MASUMURA MASAO , SAWAYAMA NOBORU
IPC分类号： G03G15/06 , G03G15/00 , G03G21/00
摘要： PURPOSE:To prevent an image from generating voids and having its ground stained by providing a developing bias switching means which increases and decreases a developing bias in addition to an image density adjusting means. CONSTITUTION:When a notch key 26 for image density adjustment on a console panel is operated, the set levels of the threshold values of all picture elements are increased or decreased to vary the density of a formed image. Further, when the white void prevention key 27 and ground staining prevention key 28 of a developing bias switching means are operated, the developing bias potential is increased or decreased to set the relation of the dark potential and light potential of an electrostatic latent image with the developing bias potential to the best condition. Therefore, the relation between the potential state of the electrostatic latent image formed on a photosensitive drum and the developing bias potential is adjusted to a proper state to prevent the formed image from generating voids and has its ground stained.

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