中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

63 records (took 0.022 seconds)

    Magnetic developer roller
    4.
    发明专利
    Magnetic developer roller 未知

    公开(公告)号：GB2350694A

    公开(公告)日：2000-12-06

    申请号：GB0020334

    申请日：1997-09-02

    Applicant: BRIDGESTONE CORP

    Inventor： TAKAGI KOJI ,  TAKIZAWA YOSHIO ,  SAWA EIJI ,  AOKI SHIGERU ,  DAIFUKU HIDEHARU ,  TAKEBE KOUTARO ,  GOTO TAIHEI

    IPC: B29C45/00 ,  B29C45/40 ,  G03G15/09 ,  H01F7/02 ,  H01F41/02 ,  B29C33/20 ,  B29C45/42 ,  B29D31/00

    Abstract: A magnet roller comprises a magnet body portion and a shaft portion formed integral with each other. The roller also comprises a plurality of poles in which the magnetic force between a magnetic pole having a maximum magnetic force and another magnetic pole having a minimum magnetic force differs by 100 G or more. Also disclosed is a molding method for manufacturing a magnetic roller. In molding the magnetic mixture, the magnetic body portion (1) of the magnet roller is pushed by ejection pins (4) to thereby remove the magnet roller from a mold (31,32). Alternatively, a gate is provided in the mold at a position corresponding to the outer circumferential surface or the end surface of the magnet body portion or the outer circumferential surface of the shaft portion, and the bonded magnet composition is injected through the gate into the mold cavity. The magnet roller may have an aluminium sleeve in which the inner diameter of the sleeve is X mm and the outer diameter of the magnet roller is (X - 4) to (X - 0.2) mm. Alternatively, the roller may have a resin outer layer whose elongation at break defined by JIS K7113 is 10% or less is formed on the sleeve surface. A developing device is configured by using the developing roller.

    Magnetic developer roller and its production by moulding
    6.
    发明专利
    Magnetic developer roller and its production by moulding 未知

    公开(公告)号：GB2316769A

    公开(公告)日：1998-03-04

    申请号：GB9718605

    申请日：1997-09-02

    Applicant: BRIDGESTONE CORP

    Inventor： TAKAGI KOJI ,  TAKIZAWA YOSHIO ,  SAWA EIJI ,  AOKI SHIGERU ,  DAIFUKI HIDEHARU ,  TAKEBE KOUTARO ,  GOTO TAIHEI

    IPC: B29C33/44 ,  B29C45/00 ,  B29C45/40 ,  F16C13/00 ,  G03G15/08 ,  G03G15/09 ,  H01F7/02 ,  H01F41/02 ,  B29C33/20 ,  B29C45/42 ,  B29D31/00

    Abstract: A magnet roller composed of a magnet body portion and a shaft portion integral with each other is produced by moulding a mixture of a resin Sr ferrite whose Sr/Ba ratio is 1 to 100. There is also disclosed a roller with a plurality of poles in which the magnetic pole having a maximum magnetic force and another magnetic pole having a minimum magnetic force differs by 100 G or more. In molding the magnetic mixture, the magnetic body portion (1) of the magnet roller is pushed by ejection pins (4) to thereby remove the magnet roller from a mold (31, 32). Alternatively a gate is provided in the mold at a position corresponding to the outer circumferential surface or the end surface of the magnet body portion or the outer circumferential surface of the shaft portion, and the bonded magnet composition is injected through the gate into the mold cavity. The magnetic roller may have an aluminium sleeve, in which the inner diameter of the sleeve is X mm, and the outer diameter of the magnet roller is (X - 4) to (X - 0.2) mm. Alternatively, the roller may have a resin outer layer whose elongation at break defined by JIS K7113 is 10% or less is formed on the sleeve surface.

    DEVELOPING METHOD AND DEVICE FOR ELECTROSTATIC LATENT IMAGE
    9.
    发明专利
    DEVELOPING METHOD AND DEVICE FOR ELECTROSTATIC LATENT IMAGE 失效

    公开(公告)号：JP2000066510A

    公开(公告)日：2000-03-03

    申请号：JP23668399

    申请日：1999-08-24

    Applicant: BRIDGESTONE CORP

    Inventor： TAKAGI MITSUHARU ,  TAKIZAWA YOSHIO ,  KANEDA HIROSHI ,  KAWAGOE TAKAHIRO

    IPC: G03G9/08 ,  G03G15/06 ,  G03G15/08

    Abstract: PROBLEM TO BE SOLVED: To make surely reproducible a good image for a long time by easily and surely controlling the compatibility between toner and a developing roller, and surely preventing high potential fogging from occurring without the occurrence of an image defect caused by image memory and normal fogging. SOLUTION: As to this developing method, developer 4 for positive electrification is carried on the surface of a developing roller 1, so that the thin layer of the developer 4 is formed, a charge is directly injected to this developer, and the developer is supplied to the surface of the latent image holding body 3 and an electrostatic latent image on the surface of the body 3 is visualized by the rotation of the roller 1 along the surface of the body 3 in a state where the roller 1 is brought into contact with or proximate to the body 3. In this case, an ionized potential on the surface of the developer 4 is set as 4.5 to 5.5 eV, the ionized potential on the surface of the roller 1 is adjusted equal to or below the ionized potential on the surface of the developer 4 by using carbon black of >=pH 5 as the developer, and the developing is performed.

    TONER CARRYING ROLLER AND IMAGE FORMING DEVICE
    10.
    发明专利
    TONER CARRYING ROLLER AND IMAGE FORMING DEVICE 失效

    公开(公告)号：JPH11311898A

    公开(公告)日：1999-11-09

    申请号：JP12037698

    申请日：1998-04-30

    Applicant: BRIDGESTONE CORP

    Inventor： HARASHIMA HIROSHI ,  TAKIZAWA YOSHIO

    IPC: G03G15/06 ,  F16C13/00 ,  G03G15/08

    Abstract: PROBLEM TO BE SOLVED: To obtain a uniform image whose environment dependency is reduced and whose quality is excellent without having density unevenness and surface fogging, and also to attain an excellent gradation performance. SOLUTION: This roller 1 is constituted so as to supply an image forming body 3 with toner 4 by being brought into contact with or being adjacent to it and to form a visible image on the surface of the image forming body 3. In this case, the roller 1 possesses a resin layer and an elastic layer consisting of a resin material whose resistance is low, and also a difference between the maximum value and the minimum value of a roller resistance at the time of rotating in a roller peripheral direction by applied voltage 100 V is set to be within 1.0 by logarithm. Also, the roller 1 is attached to this device.

Patent Agency Ranking