公开(公告)号：WO1988004819A1

公开(公告)日：1988-06-30

申请号：PCT/US1987003274

申请日：1987-12-11

Applicant: EASTMAN KODAK COMPANY

Inventor： EASTMAN KODAK COMPANY ,  CHANDLER, Jasper, S.

IPC: G11B07/00

CPC classification number: G11B7/093

Abstract: A motor assembly incorporated in an optical read/write head to effect tracking or focusing movement of an optical element comprises a generally horseshoe-shaped field assembly having two slotted pole pieces (52, 54, 76, 78, 86, 88) magnetized with opposite polarity by a permanent magnet (56, 80, 96) to provide two pairs of field poles confronting corresponding poles of a moveable armature (24, 26). A single coil (58) is wound through the slots of the pole pieces (52, 54, 76, 78, 86, 88) around the inner field poles (60, 62). The direction and intensity of the current flowing in the field coil (58) determines the degree to which the permanent magnetism is reinforced in one pole of each pole piece and counteracted in the other pole of each pole piece, thereby causing corresponding movement of the armature (24, 26).

公开(公告)号：WO1988004821A1

公开(公告)日：1988-06-30

申请号：PCT/US1987003284

申请日：1987-12-11

Applicant: EASTMAN KODAK COMPANY

Inventor： EASTMAN KODAK COMPANY ,  CHANDLER, Jasper, S.

IPC: G11B07/08

CPC classification number: G11B7/0932

Abstract: The optical element assembly in a read/write head of the type used in an optical recording system for focusing a laser beam onto an optical disk or the like is supported by a single four-member flexure structure that prevents such element from tilting while providing for (i) tracking movement about a pivot axis (28) spaced from the optical element and (ii) focusing movement along the direction of that axis. Preferably, the flexure structure is symmetrical and comprised of identical flexure members (44, 46, 48, 50) to optimize resonance characteristics, and the center of mass of the optical element assembly is coincident with such pivot axis to isolate that element from inertial forces resulting from positioning movement of the read/write head.

公开(公告)号：WO1986005940A1

公开(公告)日：1986-10-09

申请号：PCT/US1986000563

申请日：1986-03-21

Applicant: EASTMAN KODAK COMPANY

Inventor： EASTMAN KODAK COMPANY ,  MUKA, Edward ,  CHANDLER, Jasper, S. ,  KESSLER, David ,  HARDY, James, Alan

IPC: H04N01/393

CPC classification number: H04N1/393 ,  G02B26/126 ,  G02B27/0031

Abstract: The laser printer uses a rotating polygon (30) and a cylindrical mirror (44) disposed between the polygon and an image zone. The cylindrical mirror corrects for pyramidal errors in an output image formed on a moving photosensitive member (PM) disposed at the image zone by making the operative polygon facet and the image zone optionally conjugate in the page scan direction. To change the length (S1, S2) of the image in the line scan direction at the image zone, the optical distance between the polygon and image zone is varied by moving the cylindrical mirror. The velocity of the photosensitive member is adjusted to change the length of the output image in the page scan direction. At the new image format size, the cylindrical mirror makes the operative polygon facet optically conjugate with the image zone in the page scan direction to correct for pyramidal errors.

Abstract translation: 激光打印机使用设置在多边形和图像区域之间的旋转多边形（30）和圆柱形反射镜（44）。 柱面镜通过使操作多边形面和图像区任选地在页面扫描方向上共轭来校正形成在设置在图像区域的移动感光构件（PM）上的输出图像中的锥体错误。 为了在图像区域沿线扫描方向改变图像的长度（S1，S2），通过移动圆柱形镜来改变多边形和图像区域之间的光学距离。 调整感光构件的速度以改变输出图像在页面扫描方向上的长度。 在新的图像格式尺寸下，圆柱形镜使操作多边形面与页面扫描方向上的图像区域光学共轭，以校正锥体误差。