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    Write head controller
    166.
    发明公开
    Write head controller 失效
    写头控制器

    公开(公告)号：EP0327929A3

    公开(公告)日：1991-11-27

    申请号：EP89101633.9

    申请日：1989-01-31

    Applicant: POLAROID CORPORATION

    Inventor： Plummer, William T.

    IPC: G06K15/22 ,  H04N1/04

    CPC classification number: H04N1/0678 ,  G01D5/264 ,  G01D5/36 ,  H04N1/047 ,  H04N1/06 ,  H04N2201/02416 ,  H04N2201/02439 ,  H04N2201/03108 ,  H04N2201/0471 ,  H04N2201/04724 ,  H04N2201/04727 ,  H04N2201/04729 ,  H04N2201/04731 ,  H04N2201/04734 ,  H04N2201/04755 ,  H04N2201/04756 ,  H04N2201/04789 ,  H04N2201/04791 ,  H04N2201/04794

    Abstract: A system for precisely positioning a printing element relative to a rotating drum, as in a drum printer, employs two position signals for alignment purposes. A pair of linear grids is disposed along a path of travel of the printing element for generating, with the aid of optical beam and sensor devices, a periodic electric signal which varies in accordance with printing element position. One of the grids is stationary and the second of the grids moves with a carriage supporting the printing element. An encoder positioned alongside the drum is operative with a set of markings having a variation in spatial frequency, or a grid overlay, to produce an alternating electric signal which varies in accordance with rotational position of the drum. Motors which rotate the drum as well as a lead screw which translates the printing element may be constructed as synchronous motors to permit phase locking to each other. Circuitry responsive to periodic signals outputted by the linear grids and the encoder introduce phase shift between motor drive signals to align position of the printing element with position of the drum independently of any backlash which may be present between the lead screw and the carriage driven by the lead screw.

    Image forming apparatus having optical scanning unit and method of adjusting lens position in optical scanning unit
    170.
    发明公开
    Image forming apparatus having optical scanning unit and method of adjusting lens position in optical scanning unit 有权
    具有透镜位置调整的光学扫描单元和方法在光学扫描单元的图像形成装置

    公开(公告)号：EP1809012A1

    公开(公告)日：2007-07-18

    申请号：EP07000495.7

    申请日：2007-01-11

    Applicant: Ricoh Company, Ltd.

    Inventor： Tomita, Yasumasa Ricoh Company, Ltd.

    IPC: H04N1/113 ,  H04N1/032

    CPC classification number: H04N1/1135 ,  H04N1/032 ,  H04N2201/02414 ,  H04N2201/02416 ,  H04N2201/02431

    Abstract: An optical scanning unit includes a light source, a lens, a deflector, a lens holder, a support member, a force-generating member, and a force-transmitting member. The light source emits a light beam. The lens passes through the light beam. The deflector rotatably deflects the light beam coming from the lens. The lens holder, provided between the light source and the deflector, holds the lens. The support member has a first face faced to a vertically-downward direction, and extends in a direction from the light source to the deflector. The lens holder is movably supported by the first face of the support member. The force-generating member, provided to a second face of the support member, generates a force. The second face is opposite to the first face. The force-transmitting member transmits the force generated by the force-generating member to the lens holder to move the lens holder along the first face.

    Abstract translation: 一种光学扫描单元包括光源，透镜，偏转器，透镜夹持器，支撑件，力产生部件和一个力传递构件。 该光源发射的光束。 透镜穿过光束。 偏转器可旋转地偏转的光束从透镜来。 透镜保持器，所述光源和所述偏转器之间，保持透镜。 支撑构件具有面对的垂直向下的方向上的第一面，并且在从光源到偏转的方向延伸。 透镜保持器被可移动地由所述支撑构件的第一面支撑。 设置于支承构件的第二面的力产生部件，基因费率的力。 所述第二面是相对于该第一面。 力传递部件发送由所述力产生部件所产生的透镜夹持器沿着第一面移动透镜保持器上的力。

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