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    IMAGE FORMING DEVICE
    92.
    发明专利
    IMAGE FORMING DEVICE 失效

    公开(公告)号：JPH0713408A

    公开(公告)日：1995-01-17

    申请号：JP14915693

    申请日：1993-06-21

    Applicant: CANON KK

    Inventor： WATANABE AKIRA ,  GOTO TAKU ,  ARAYA JUNJI ,  NAGASE YUKIO ,  TADA TATSUYA ,  SAKAI KIYOSHI ,  IKEDA TAKESHI

    IPC: G03G15/05 ,  B41J2/44 ,  G03G15/04 ,  G03G15/24 ,  G03G21/16

    Abstract: PURPOSE:To increase the degree of freedom in designing the installation position for an optical writing exposure device and to mlniaturize the device by changing the optical path of image light transmitted through a photoreceptive body and forming an image on a photoconductor layer. CONSTITUTION:A laser exposure device 2 for exposing an image is arranged outside the photoreceptive drum 1. An exposure beam E is transmitted through a light- transmissive photoconductor layer 1-3 of the photoreceptive drum 1, a light-transmissive conductive layer 1-2 and a lighttransmissive supporting body 1-1 in this order, and the optical path of the beam E is changed by a reflection mirror 4 as an optical member constituting optical path changing member fixedly arranged at the inner surface of the photoreceptive drum 1, and the beam is made incident on the light- transmissive supporting body 1-1 again in an electrifying, exposuring and developing area as an abutting part of non-magnetic sleeve 5-2 and the photoreceptive drum 1 so as to form the image on the light-transmissive photoconductor layer 1-3. The incident area A for the exposure beam and the position of the developing device 5 are freely set by properly setting not only the position of the exposure beam E which is reflected by the reflection mirror 4 at almost 90 in such a way, but also the angle of the reflection mirror 4.

    ELECTROPHOTOGRAPHIC CARRIER
    93.
    发明专利
    ELECTROPHOTOGRAPHIC CARRIER 失效

    公开(公告)号：JPH0619212A

    公开(公告)日：1994-01-28

    申请号：JP19467092

    申请日：1992-06-30

    Applicant: CANON KK

    Inventor： SATO YOSHIHIRO ,  AMANO YASUKO ,  IKEDA TAKESHI

    IPC: G03G9/107 ,  G03G9/113

    Abstract: PURPOSE:To provide an electrophotographic carrier with the surface coated with resin, excellent in durability and toner spending resistance, capable of stably impressing a good charge amt. to the toner over a long period and capable of forming a high-definition picture. CONSTITUTION:This electrophotographic carrier is obtained by coating a core with an insulating resin. The core consists of a ferrite grain contg. strontium, barium and lead, and the coercive force of the grain is controlled to >=300 Gauss in the magnetic field of 10kOe. A styrene-acrylate copolymer is used as the resin to coat the core, the copolymer contains 30-90wt.% acrylic monomer, and the weight average mol.wt. of the copolymer is controlled to about 30,000 to 70,000 and the ratio of the weight average mol.wt. to number average mol.wt. to 2 to 10.

    ELECTROPHOTOGRAPHIC CARRIER
    97.
    发明专利
    ELECTROPHOTOGRAPHIC CARRIER 失效

    公开(公告)号：JPH0572813A

    公开(公告)日：1993-03-26

    申请号：JP17482991

    申请日：1991-06-20

    Applicant: CANON KK

    Inventor： SATO YOSHIHIRO ,  IKEDA TAKESHI

    IPC: G03G9/113

    Abstract: PURPOSE:To obtain such a carrier with which little change is caused due to environmental changes and stable images can be obtd. for a long time, and to decrease the deterioration of carrier due to long-term use by coating the carrier with a specified resin. CONSTITUTION:The carrier is coated with a resin, which contains quaternary ammonium salt expressed by formula I and has a domain-matrix structure. In formula I, A is an org. anion, R1-R3 are alkyl groups or aryl groups, R4 is an alkyl group, aryl group or aralkyl group, and the alkyl groups and aralkyl groups may have other substituents. The domain resin particles dispersed in the matrix resin has =15 acid value, while the matrix resin has 50-80 deg.C glass transition point Tg2 and =10 deg.C. The domain resin has a carboxyl group.

    MAGNETIC SUBSTANCE DISPERSION TYPE CARRIER, TWO-CONSTITUENT DEVELOPER FOR DEVELOPING ELECTROSTATIC CHARGE IMAGE AND MANUFACTURE
    98.
    发明专利
    MAGNETIC SUBSTANCE DISPERSION TYPE CARRIER, TWO-CONSTITUENT DEVELOPER FOR DEVELOPING ELECTROSTATIC CHARGE IMAGE AND MANUFACTURE 失效

    公开(公告)号：JPH04365053A

    公开(公告)日：1992-12-17

    申请号：JP13220591

    申请日：1991-05-09

    Applicant: CANON KK

    Inventor： BABA YOSHINOBU ,  AMANO YASUKO ,  TADA TATSUYA ,  SATO YOSHIHIRO ,  IKEDA TAKESHI

    IPC: G03G9/107 ,  G03G9/113

    Abstract: PURPOSE:To improve the paint resistance and shock resistance, reduce the toner deterioration, and stabilize a high-quality image over a long period by specifying the resin covering the surface of a core material. CONSTITUTION:A two-constituent developer for developing an electrostatic charge image has a magnetic substance dispersion type carrier 27 and toner 37. In the magnetic substance dispersion type carrier 27 having a core material dispersed with magnetic substance fine grains in binding resin and covered with resin on the surface of the core material, the resin covering the core material has alkoxy alkyl polyamide resin. The true specific gravity of the carrier 27 is preferably set to 1.5-5.5, the magnetic force of the magnetic substance dispersed in the core material is 60emu/g or above in the magnetic field 10K oersted, the grain size of the carrier 27 is 10-60mum, the specific resistance of the carrier 27 is 10 OMEGA.cm-10 OMEGA.cm, and the core material is generated by polymerization.

    CARRIER FOR ELECTRONIC PHOTOGRAPH
    100.
    发明专利
    CARRIER FOR ELECTRONIC PHOTOGRAPH 失效

    公开(公告)号：JPH04199063A

    公开(公告)日：1992-07-20

    申请号：JP33268090

    申请日：1990-11-29

    Applicant: CANON KK

    Inventor： SATO YOSHIHIRO ,  IKEDA TAKESHI

    IPC: G03G9/113

    Abstract: PURPOSE:To equip a carrier for electronic photograph according to the invention with excellent durability and anti-toner spent property, lessen variation of the electrostatic charging characteristic despite changing environment, and build a stable image by enwrapping the carrier with polymeride or copolymeride including a specific unitary component. CONSTITUTION:A carrier for electronic photograph according to the invention is enwrapped with polymeride or copolymeride including a unitary component as expressed by Eq. I, where R1, R2 are alkyl radical or aryl radical either identical or different, A is organic anion, poly-acid ion, heteropolyacid ion, or halogen, and n is either of 0, 1, 2, 3. This lessens change in the electrostatic charging amount despite changing environment, provides stable image density, and eliminates deterioration of the carrier for example becoming toner spent in the course of long time service.

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