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61. 发明专利

JPH11198405A INK-JET RECORDING APPARATUS 失效
公开(公告)号：JPH11198405A
公开(公告)日：1999-07-27
申请号：JP810798
申请日：1998-01-19
申请人： RICOH KK
发明人： MATSUMOTO SHUZO , MURAI TAEKO , FUJII MITSUYOSHI
IPC分类号： B41J2/01 , B41J2/165 , B41J2/175 , B41J2/18 , B41J2/185
摘要： PROBLEM TO BE SOLVED: To recover a head by an idle discharge action without lowering a photographic printing speed by setting an idle discharge recording liquid reservoir for holding a recording liquid to be discharged at the idle discharge action at a position facing the head via a paper transfer path. SOLUTION: An idle discharge recording liquid reservoir 7 like a recess is formed at a position facing a head unit 1 via a paper transfer path 6 to hold ink which is discharged at an idle discharge action of the head unit 1. The idle discharge recording liquid reservoir 7 is enough to have a necessary minimum opening area at the whole of a nozzle arrangement region of the head unit 1. An ink-absorbing body 8 that can absorb ink is stored in the reservoir 7. The ink-absorbing body is formed of a porous body, e.g. urethane foam body or the like. A control part activates a suction pump regularly to forcibly discharge ink to a waste ink tank. Therefore, the idle discharge action is carried out without lowering a photographic printing speed.

62. 发明专利

JPH10305565A RECORDER 失效
公开(公告)号：JPH10305565A
公开(公告)日：1998-11-17
申请号：JP11810697
申请日：1997-05-08
申请人： RICOH KK
发明人： OTA YOSHIHISA , FUJII MITSUYOSHI , MURAI TAEKO , MATSUMOTO SHUZO , NAKANO TOMOAKI
IPC分类号： B41J2/01 , B41J19/20
摘要： PROBLEM TO BE SOLVED: To provide a recorder wherein the driving durability of a recording head having a plurality of nozzles is excellent, and mutual interference between adjacent channels is not generated. SOLUTION: A recording head 1 and a guide roll 3a are disposed such that an angle θ between a main scanning direction and a sub-scanning direction in a recorder does not become 90 degree. When printing a straight line or a hollow line parallel to the main scanning direction in an image, a plurality of driving channels in the recording head 1 can be sequentially used, thereby eliminating a periodic characteristic or a regularity of the driving channels. As a result, it is possible to eliminate mutual interference between driving channels and to improve driving durability of the recording head 1 by effectively using the plurality of channels.

63. 发明专利

JPH10138474A INK JET HEAD 失效
公开(公告)号：JPH10138474A
公开(公告)日：1998-05-26
申请号：JP29639996
申请日：1996-11-08
申请人： RICOH KK
发明人： MURAI TAEKO , MATSUMOTO SHUZO , NAKANO TOMOAKI , MAKITA HIDEYUKI , OTA YOSHIHISA , FUJII MITSUYOSHI , TSUNODA SHINICHI
IPC分类号： B41J2/175 , B41J2/045 , B41J2/055 , B41J2/16
摘要： PROBLEM TO BE SOLVED: To enhance a property of discharging bubbles and to improve a reliability of a head by a constitution wherein a pressurizing liquid chamber, a common liquid chamber and an ink supplying passage are partitioned by an ink liquid chamber partition member having plural layers, an inlet wall is also formed of the partition member and the inlet wall is curved. SOLUTION: An ink jet head comprises an actuator unit having a piezoelectric element and a liquid chamber unit. The liquid chamber unit is so constituted that a thin film vibration plate, an ink chamber partition member 29 and a nozzle plate 32 are sequentially laminated. The ink chamber partition member 29 is so constituted that first-fifth photosensitive resin layers 51-55 are laminated from the side of the vibration plate. An inlet of an ink supply passage 35 is formed of the first photosensitive resin layer 51 which is mostly away from a nozzle 31. An angle section is removed from a wall section 35a of the inlet of the ink supply passage 35 so that the wall section 35a is in a curved shape. As a result, a property of discharging bubbles is enhanced and an initial filling ability of ink is improved.

64. 发明专利

JPH10119261A INK JET HEAD 失效
公开(公告)号：JPH10119261A
公开(公告)日：1998-05-12
申请号：JP27570396
申请日：1996-10-18
申请人： RICOH KK
发明人： FUJII MITSUYOSHI , MATSUMOTO SHUZO , NAKANO TOMOAKI , MAKITA HIDEYUKI , MURAI TAEKO , OTA YOSHIHISA , TSUNODA SHINICHI
IPC分类号： B41J2/045
摘要： PROBLEM TO BE SOLVED: To prevent the diffraction of a pressure wave so as to improve a recording quality, without causing any deterioration in an ink jet characteristic. SOLUTION: An ink jet head comprises a first ink chamber 11 in which an amount of ink is pressurized by an energy generated by an energy converting element 5, a common ink chamber 12 for supplying the ink to the first ink chamber 11, a second ink chamber 13 located between the first ink chamber 11 and the common ink chamber 12, a first ink supply line 14 in communication with the first ink chamber 11 and the second ink chamber 13, a second ink supply line 15 in communication with the second ink chamber 13 and the common ink chamber 12, an adhesive elastic material 17 provided within the second ink chamber 13 to easily absorb a pressure wave.

65. 发明专利

JPH05208496A INK JET PRINTING HEAD 失效
公开(公告)号：JPH05208496A
公开(公告)日：1993-08-20
申请号：JP4222192
申请日：1992-01-31
申请人： RICOH KK
发明人： FUJII MITSUYOSHI
IPC分类号： B41J2/05 , B41J2/14 , H04N1/23
摘要： PURPOSE:To create a halftone image with a high image quality in a simple manner by a method wherein the magnitude of a dot to be printed can be easily changed by simply and automatically changing the magnitude of a bubble to be produced. CONSTITUTION:One end of a heater 9 is connected to a common line 14. A plurality of electrodes 10, 10a, 10b, 10c are provided at intervals between both ends of the heater. These electrodes are connected to a switching means to be selected. In this manner, the magnitude of a bubble can be adjusted stepwise.

66. 发明专利

JPH0534618A OPTICAL WRITING DEVICE AND MOVING METHOD FOR CYLINDER LENS 失效
公开(公告)号：JPH0534618A
公开(公告)日：1993-02-12
申请号：JP19380091
申请日：1991-08-02
申请人： RICOH KK
发明人： FUJII MITSUYOSHI
IPC分类号： G02B26/10 , B41J2/44 , G03G15/04
摘要： PURPOSE:To optical writing device and the moving method for a cylinder lens, by which a laser diode of a high output is not required by moving a lens holding member for holding the cylinder lens 4 the optical axis direction by frictional force, and also, a backlash is extremely small, the movement of a position of the cylinder lens can be adjusted with high accuracy, and moreover, it can be executed at a low cost. CONSTITUTION:In an optical writing device 22 having a lens moving mechanism 20 for moving a lens holding member 25 for holding a cylinder lens 7 in the optical axis direction K, in the optical axis direction, this device is constituted so that the lens moving mechanism 20 is subjected to frictional contact with the lens holding member 25 and moves the lens holding member 23 in the optical axis direction by frictional force Fm.

67. 发明专利

JPH04369612A OPTICAL WRITING DEVICE 失效
公开(公告)号：JPH04369612A
公开(公告)日：1992-12-22
申请号：JP17326191
申请日：1991-06-18
申请人： RICOH KK
发明人： FUJII MITSUYOSHI
IPC分类号： B41J2/44 , G02B27/00 , G02B27/09 , G03G15/04
摘要： PURPOSE:To structure a beam diameter adjustment part which uses apertures at low cost and to reduce its size. CONSTITUTION:The apertures 36 and 37 are composed of flexible printed boards with opening parts 43 and 44 at their center parts, conductor patterns 45 and 46 are provided at the peripheries of the opening parts, and yokes 40 and 41 which form a magnetic circuit with a permanent magnet 35 are arranged opposite the conductor patterns 45 and 46. Currents are supplied to the conductor patterns 45 and 46 to generate an electromagnetic force with the magnetic circuit and the apertures 36 and 37 are deformed to slant their opening parts.

68. 发明专利

JPH03216617A OPTICAL SCANNING AND RECORDING DEVICE 失效
公开(公告)号：JPH03216617A
公开(公告)日：1991-09-24
申请号：JP1220790
申请日：1990-01-22
申请人： RICOH KK
发明人： FUJII MITSUYOSHI
IPC分类号： B41J2/44 , G02B26/10 , G03G15/04
摘要： PURPOSE:To allow the conversion of a resolution with high accuracy by providing a driving means for turning a plate member in a sub-scanning direction, a detecting means for detecting the diameter of a light beam and a control means for changing the diameter of the light beam by controlling the energization to the driving means. CONSTITUTION:The beam diameter on the surface of a photosensitive drum is changed to change the resolution by utilizing the change in the diameter of the light beam past an exit port 65a by an aperture 60 which inclines by receiving force from the magnetic fields by yokes 53 to 55 and permanent magnets 57, 58 when the coil of the aperture 60 is energized. Namely, the light beam emitted form the beam exit port 65a is detected by the detecting means 74 and the control means 76 controls the energization to the driving means, thereby changing the diameter of the light beam emitted from the beam exit port 65a. The diameter is surely changed to the specified diameter of the light beam in this way. The conversion of the resolution with the high accuracy is thus executed.

69. 发明专利

JPH0387811A SCANNER MOTOR 失效
公开(公告)号：JPH0387811A
公开(公告)日：1991-04-12
申请号：JP22328189
申请日：1989-08-31
申请人： RICOH KK
发明人： FUJII MITSUYOSHI
IPC分类号： G02B26/12 , B41J2/44 , F16C17/10 , G02B26/10 , G03G15/04 , H02K29/00
摘要： PURPOSE:To shorten the spindle and obtain a small-sized, low-cost motor by forming a dynamic pressure fluid bearing of the thrust bearing plate of a boss part and a spindle end surface, and herringbone grooves and an opposite surface. CONSTITUTION:The dynamic pressure fluid bearing as a radial bearing is formed of the plural herringbone grooves 7a and 7b formed in the spindle 3 of the scanner motor 1 and the opposite surface 88 formed on the boss part 5 of a disk 4. Further, the dynamic pressure fluid bearing as a thrust bearing is formed of the thrust bearing plate 15 which is fixed to one end of the boss part 5 and has a spiral groove 14 and the spindle end surface. The dynamic pressure effect of liquid (oil) is utilized to make the rigidity of the radial bearing sufficiently large, the bearing interval is reduced for waving rotation due to the eccentricity of the disk, and the spindle is made short to reduce the thickness of the motor.

70. 发明专利

JPS63221315A POLYGONAL SCANNER MOTOR 失效
公开(公告)号：JPS63221315A
公开(公告)日：1988-09-14
申请号：JP5616887
申请日：1987-03-11
申请人： RICOH KK
发明人： FUJII MITSUYOSHI
IPC分类号： F16C27/02 , G02B5/09 , G02B26/12 , H02K7/08
摘要： PURPOSE:To eliminate the need for precise working accuracy of a journal and to reduce cost by providing a foil bearing provided radially with leaves having electricity between the journal and air bearing hole. CONSTITUTION:A rotor 30 rotates in a floating state when a plunger 39 is attracted by a coil 41 for thrust while high-frequency current is kept passed to a stator coil 40. A relative speed of the journal 31 and the foil bearing 36 increases and air flow 50 is generated in the same direction as the rotating direction of the journal 31 by the viscosity resistance of the air when the number of revolutions of the rotor 30 increases. The air flow 50 flows into a spacing 49 between the journal 31 and the leaves 48. Since the spacing 49 is narrowed to a wedge shape, the air flow 50 increases its pressure as the air flow is confined into the deep part of the spacing 49. The leaves 48 are then elastically deformed outward to increase the spacing and, therefore, the journal 31 rotates at a high speed without contact with the leaves 48 while the journal is held afloat radially in the air bearing hole 34.

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