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    • 5. 发明公开
    • Variable pel density print head for electrophotographic printers
    • Druckkopf mit variabler Bildelementdichtefürelektrophotographische Drucker。
    • EP0446608A2
    • 1991-09-18
    • EP91101648.3
    • 1991-02-07
    • INTERNATIONAL BUSINESS MACHINES CORPORATION
    • Komplin, Steven RobertPrakash, RavinderWolfe, Larry Lance
    • G02B27/12G06K15/12G02B5/04G02B27/00
    • G02B5/04G02B3/02G06K15/1261
    • In a laser printer, light beams (4) need to be focused onto a printing surface to form points where print indicia are to effect a print image. In a printer where it is desirable to have variable pitch print characters, a new method has been employed to create variable print character pitches. Multiple non-parallel points of light are emitted through a collimating lens (6) onto a wedge (8) shaped optical component which directs the multiple beams of light into parallel alignment. The optical wedge has one planar surface perpendicular to at least one light beam emitted through the collimating lens. This light beam is normal to the perpendicular planar surface and passes through the wedge without being deflected. The optical wedge also has one or more planar surfaces that direct the other light beams into parallel alignment with the undeflected light beam. By moving the optical wedge away from the collimating lens the pitch (distance) between the light beams is increased and conversely, by moving the optical wedge towards the collimating lens the pitch decreases.
    • 在激光打印机中,光束(4)需要被聚焦到打印表面上以形成打印标记来影响打印图像的点。 在希望具有可变间距打印字符的打印机中,已经采用了新的方法来创建可变打印字符间距。 多个非平行光点通过准直透镜(6)发射到楔形(8)形的光学部件上,该光学部件将多束光引导成平行排列。 光楔具有垂直于通过准直透镜发射的至少一个光束的一个平面。 该光束垂直于垂直平面并穿过楔形物而不被偏转。 光楔还具有一个或多个平面表面,其引导其他光束与未偏转的光束平行对准。 通过将光楔移动离开准直透镜,光束之间的间距(距离)增加,相反,通过将光楔向准直透镜移动,节距减小。