公开(公告)号：JPS6367152A

公开(公告)日：1988-03-25

申请号：JP21294686

申请日：1986-09-09

Applicant: SHARP KK

Inventor： OZAKI MASAAKI ,  ISHII HIROSHI ,  FURUKAWA MASANOBU ,  TOYOSHIMA TETSURO

IPC: B41J2/135 ,  B41J2/015 ,  B41J2/16

Abstract: PURPOSE:To prepare a high quality orifice plate having a precise caliber with high efficiency, by forming a base plate with a projection of a predetermined diameter on the upper surface thereof from a resin material and applying a film forming material to the upper surface of said base plate by plasma spraying to form the layer composed of the film forming material becoming an orifice plate to the entire upper surface of the base plate except the projection and subsequently removing the base plate. CONSTITUTION:A base plate 1 having a projection 1a with a predetermined diameter on the upper surface thereof is formed of a resin material. Next, stainless steel is applied to said base plate 1 from above by plasma spraying to form a stainless steel layer 2a to the entire upper surface of the base material 1 except the projection 1a. Thereafter, the base plate 1 is removed using an org. solvent to obtain an orifice plate 2 made of stainless steel.

公开(公告)号：JPS62253458A

公开(公告)日：1987-11-05

申请号：JP9739486

申请日：1986-04-25

Applicant: SHARP KK

Inventor： TOYOSHIMA TETSURO ,  KYOTANI HIROSHI ,  ISHII HIROSHI

IPC: B41J2/045 ,  B41J2/055 ,  B41J2/14

Abstract: PURPOSE:To maintain a fixed ink-jetting direction and obtain favorable printing quality, by equalizing the thicknesses of an upper layer body and a lower layer body of an ink jet head, and providing an intermediate layer body with an orifice. CONSTITUTION:At a side end part of each of an ink chamber plate 23, an orifice plate 24 and an ink inlet port plate 25 is provided a slit 34 extending in a direction perpendicular to the surface of a paper, in a range covering the plates 23-25. The slit 34 defines an ink-jetting opening part J. The ink chamber plate 23 and the ink inlet port plate 25 have the same thickness, and the orifice plate 24 is provided with an orifice O. Therefore, the center line of the orifice O coincides with the center line of the meniscus M of the surface of an ink in the opening part J, irrespective of the accuracy of assembly, so that the ink is jetted from the center of the meniscus M without fail. Accordingly, a fixed ink-jetting direction is maintained, and favorable printing quality can be obtained.

公开(公告)号：JP2001175075A

公开(公告)日：2001-06-29

申请号：JP36204099

申请日：1999-12-21

Applicant: SHARP KK

Inventor： TOYOSHIMA TETSURO ,  AZUMA NOBUYUKI ,  NAKAJIMA YOSHINORI ,  IWAMATSU TADASHI ,  MUTO YOSHINORI

IPC: G03G21/00 ,  G03G15/08

Abstract: PROBLEM TO BE SOLVED: To prevent the occurrence of uneven density, fogging and irregularities in an image due to a mechanical fluctuation at a contact part between a toner carrier and an electrostatic latent image holding body, and to form an image of good quality even at the time of forming an image of high resolution. SOLUTION: At a developing position where the circumferential surface of a developing roller 10 comes into press contact with the surface of a photoreceptor drum 2, as for a nip pressure P applied to the developer roller 10, the deformation δ of the developing roller 10, and a nip width S as the contact width of the circumferential surface of the developing roller 10 with the surface of the photoreceptor drum 2 in the circumferential direction, a spring constant P/δ is set within an extent of 2-200, P>1 gf/mm, S>2 mm, P/S (the ratio of the nip pressure P to the nip width S) is set to be 0.5 to 7. The dispersion of the dot diameter of a toner image formed on the surface of the photoreceptor drum 2 is suppressed, then, the outline of the dot becomes clear.

公开(公告)号：JPH1115263A

公开(公告)日：1999-01-22

申请号：JP16388597

申请日：1997-06-20

Applicant: SHARP KK

Inventor： ISHII HIROSHI ,  TOYOSHIMA TETSURO ,  TATSUMI HIROSHI ,  SAKAI KOJI

IPC: G03G15/08

Abstract: PROBLEM TO BE SOLVED: To provide a highly-reliable developing device in which the structure for controlling a contact nip is simplified while absorbing a peripheral-speed difference due to a developing operation. SOLUTION: This device is provided with a developing roller 2 which rotates in contact with a photoreceptive drum 1, having a peripheral-speed difference between them. A contact-depth setting roller 9, which has a round external surface as a first abutting face and a round internal surface as a second abutting face and controls the depth of the contact of the developing roller 2 with the photoreceptive drum 1 so that it has a specific value, is idly mounted on each end of the shaft 3 of the developing roller 2. The round external surface and round internal surface of each of the contact-depth setting rollers 9 are made almost equal in peripheral speed to the surfaces of the corresponding members with which they abut.

公开(公告)号：JPH06295121A

公开(公告)日：1994-10-21

申请号：JP8056193

申请日：1993-04-07

Applicant: SHARP KK

Inventor： YAMANAKA TAKAYUKI ,  KAMIMURA TASUKE ,  TOYOSHIMA TETSURO

IPC: G03G15/06 ,  G03G15/08

Abstract: PURPOSE:To sufficiently transport toners without increasing the layer thickness of the toners by applying an AC voltage between an electrode and a toner carrying member and applying the DC voltage of the same electrostatic charge polarity as the polarity of the toner particles between this electrode and this member. CONSTITUTION:A drum base body of the toner carrying member 2 consists of a material having an electrical conductivity and a power source section consisting of an AC power source 5 and a DC power source 6 is connected in series between the toner carrying member 2 and the electrode part 4. The AC voltage and the DC voltage are applied between the electrode part 4 and the toner carrying member 2. The electric field in the direction oscillates between the electrode part 4 and the toner carrying member 2 is applied on the positive electrostatically charged toners 7 by the AC power source 5. The electric field in the direction repulsing the electrode part 4 and approaching the toner carrying member 2 is applied on the positive electrostatically charged toners 7 by the DC power source 6 connected so that the polarity of the electrode part 4 is same as the electrostatic polarity of the toners. Then, the positive electrostatically charged toners 7 are attracted toward the toner carrying member 2 by the DC voltage while toners vibrate toward the surface of the toner carrying member 2, by which the toners are successively compacted on the surface of the toner carrying member 2.

公开(公告)号：JPH06282157A

公开(公告)日：1994-10-07

申请号：JP6648293

申请日：1993-03-25

Applicant: SHARP KK

Inventor： FUJITA HIDEAKI ,  TOYOSHIMA TETSURO ,  KAMIMURA TASUKE

IPC: G03G15/08

Abstract: PURPOSE:To obtain a high-density image without causing trouble such as fogging in the case of performing development by using a developing device using one- component developer. CONSTITUTION:In this developing device, toner 7 whose resistance value is set to OMEGAcm is used; and a toner carrier 3 carrying and feeding the toner 7, and a blade 4 arranged to be opposed to the toner carrier 3 and pressed to the toner carrier 3 side by the pressing force of are provided; then such voltage that the polarity of the blade 1 side becomes the same as the electrostatically charged polarity of the toner is impressed between the toner carrier 3 and the blade 4.

公开(公告)号：JPH06246939A

公开(公告)日：1994-09-06

申请号：JP3583693

申请日：1993-02-24

Applicant: SHARP KK

Inventor： TOYOSHIMA TETSURO

IPC: B41J2/32 ,  B41J2/325 ,  B41J31/16

Abstract: PURPOSE:To realize a toner-melting transfer recording method and its apparatus of a new recording system wherein articles of consumption are not generated in a printing process, high quality printing becomes capable of being performed irrespective of any kind of recording paper, and miniaturization and low cost of an apparatus constitution can be achieved. CONSTITUTION:A toner cartridge 2 equipped with an elastic roller 7 for charging application of toner is provided in a transfer area of a toner-carrying film 3 which is circumferentially transferred. The elastic roller 7 for charging and application of toner is rotated in a sliding contact state with a toner-carrying film 3 having a charged property of a reversed polarity to a charged polarity of a toner 10. The toner 10 is attracted to the toner-carrying film 3 by this rotary operation. The attracted toner 10 is carried to a position of a thermal head 4, and melted and transferred to recording paper 5 by selective heating according to a printing data.

公开(公告)号：JPH01145166A

公开(公告)日：1989-06-07

申请号：JP30415087

申请日：1987-11-30

Applicant: SHARP KK

Inventor： TOYOSHIMA TETSURO ,  NAKAI TOSHIHARU ,  ISHII HIROSHI

IPC: B41J2/325

Abstract: PURPOSE:To realize stable gradation duplication recording increased in a recording speed and generating no transfer irregularity of ink, by using a current supply transfer recording system for a printer part. CONSTITUTION:A recording head 1 is fixed to a head holder 6 and the leading end side of the recording head 1 is pressed to a platen 3 by the spring 5 mounted to one end of the head holder 6. An ink film 2 and recording paper 4 are arranged between the recording head 1 and the platen 3 and pressed to the leading end side of the recording head 1 to be closely brought into contact with the platen 3. On the downstream side of the recording head 1 in the ink film 2, a roller-shape return electrode 7 is provided and pressed by pinch rollers 8 to be brought into contact with the ink film. Both the recording head 1 and the return electrode 7 are connected to a recording head driving circuit 15 and, corresponding to the drive frequency thereof, the platen 3 rotates in a clockwise direction to perform printing.

公开(公告)号：JPH01101168A

公开(公告)日：1989-04-19

申请号：JP26068287

申请日：1987-10-15

Applicant: SHARP KK

Inventor： TOYOSHIMA TETSURO ,  NAKAI TOSHIHARU ,  ASAI SHIGEMI

IPC: B41J2/32

Abstract: PURPOSE:To prepare a multilayer recording electrode with high accuracy, by preparing more than one green ceramic sheets, screen-printing electrode material containing paste on necessary portions of each sheet, and laminating and baking the sheets by pressing and heating. CONSTITUTION:A substrate green sheet 1, middle layer green sheet 3a and overcoat green sheet 4 are made of green ceramics. To form a first layer recording electrode 21 pattern on the green sheet 1 and a second layer recording electrode 22 pattern on the green sheet 3a, tungsten paste is applied by means of screen printing. The electrodes 21 and electrodes 22 are printed shifted from each other, e.g., in zigzag. The three green sheets are laminated with an insulating layer between the electrodes, pressed and heated in a reduction atmosphere to bake electrode material and substrate material at the same time. In this way, a multilayer recording head with electrodes 21, 22 embedded in a ceramic body is prepared.

公开(公告)号：JPS63290766A

公开(公告)日：1988-11-28

申请号：JP12644087

申请日：1987-05-22

Applicant: SHARP KK

Inventor： IWAMATSU TADASHI ,  NAKAI TOSHIHARU ,  SAWAI HIROYUKI ,  ASAI SHIGEMI ,  TOYOSHIMA TETSURO

IPC: B41J2/325 ,  B41J2/32 ,  B41J2/335

Abstract: PURPOSE:To obtain a recording head capable of maintaining stable printed image quality for a long time, by using an insulating resin as a material for a head substrate, chamfering the tip of the substrate in the range from the front edge of a surface for contact with a recording head to the back surface of the substrate, and providing a tip surface of the back surface with a notched groove parallel to electrode needles. CONSTITUTION:A head substrate 2 is an insulating substrate comprising a polyimide resin as a main constituent, and only the back surface of a tip part of the substrate is provided with a notched groove 4 in a width of 0.8 mm. Rib parts 5 of 0.2 mm width are provided at both sides of the groove 4, and each of the rib parts 5 is provided with a chamfer 6 by 45 deg. chamfering. The chamfer 6 is provided ranging from the vicinity of and end edge of a contact surface 7 for a recording film 13, which is provided at a tip part of the substrate. A heat-resistant insulating layer 8 comprising a polyimide resin is provided on the upper surface of the substrate 2, and a plurality of electrode needles 3 comprising tungsten as a main constituent are provided thereon, with an electrode width of about 50 mum and a pitch of 106 mum. Therefore, adhesion or deposition of printing refuse on the tip of a recording head can be reduced, printed image quality can be prevented from being lowered, and the useful life of the head can be further prolonged.