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    DYNAMIC PRESSURE PNEUMATIC BEARING STRUCTURE AND OPTICAL DEFLECTION SCANNER EMPLOYING THE STRUCTURE
    6.
    发明公开
    DYNAMIC PRESSURE PNEUMATIC BEARING STRUCTURE AND OPTICAL DEFLECTION SCANNER EMPLOYING THE STRUCTURE 失效
    DYNAMISCHE GASDRUCKLAGERVORRIVHTUNG UND DIESE VERWENDENDE ABTASTENDE OPTISCHE ABLENKVORRICHTUNG

    公开(公告)号：EP0918170A4

    公开(公告)日：2002-04-24

    申请号：EP98904429

    申请日：1998-02-23

    Applicant: SUMITOMO ELECTRIC INDUSTRIES

    Inventor： TAKEUCHI HISAO ,  MURABE KAORU ,  KOMURA OSAMU ,  AWAZU TOMOYUKI

    IPC: F16C15/00 ,  F16C33/04 ,  F16C33/10 ,  F16C33/14 ,  G02B26/12 ,  F16C17/02

    CPC classification number: G02B26/121 ,  F16C3/02 ,  F16C17/028 ,  F16C33/043 ,  F16C33/1075 ,  F16C33/14 ,  F16C2220/70 ,  F16C2226/14 ,  F16C2226/18

    Abstract: A dynamic pressure pneumatic bearing structure, by which a whirl can be avoided not only at the time of the high speed rotation but also at the time of the low speed rotation, and the variation of a floating revolution can be suppressed. The dynamic pressure pneumatic bearing structure has a shaft (1) and a bearing (2). Trenches (11) are formed in the outer circumferential surface of the shaft (1). Each trench (11) is composed of two or more recesses which are formed continuously in a circumferential direction and have practically different depths. The cross section of the trench (11) which is perpendicular to an axial line is asymmetrical with respect to the circumferential direction. The circumferential distance (a) between the cross point (15) of a line (C) connecting the deepest point (14) of the trench (11) to the center (O) of the shaft (1) and the one side edge (16) of the trench (11) on the envelope line (Q) of the shaft (1) which is provided on the downstream side of an air flow (P) produced at the time of rotation with respect to the cross point (15) is larger than the circumferential distance (b) between the cross point (15) and the other side edge (17) of the trench (11) which is provided on the upstream side of the air flow (P) with respect to the cross point (15). The dynamic pressure pneumatic bearing structure can be applied to the rotation driving unit of an optical deflection scanner.

    Abstract translation: 不仅在高速旋转时，而且在低速旋转时都能够避免涡流，并且能够抑制浮动旋转的变化的动压空气支承结构。 动压气动轴承结构具有轴（1）和轴承（2）。 沟槽（11）形成在轴（1）的外圆周表面中。 每个沟槽（11）由两个或更多个凹部组成，凹部在圆周方向上连续形成并具有实际上不同的深度。 垂直于轴线的沟槽（11）的横截面相对于圆周方向不对称。 连接沟槽（11）的最深点（14）到轴（1）的中心（O）的线（C）的交叉点（15）与一侧边缘 （15）旋转时产生的空气流（P）的下游侧的轴（1）的包络线（Q）上的沟槽（11） 大于设置在气流（P）的上游侧的沟槽（11）的交叉点（15）与另一侧边缘（17）之间的圆周距离（b） （15）。 动压气动轴承结构可应用于光学偏转扫描器的旋转驱动单元。

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