JPH03112721U

JPH03112721U -

Info

Publication number: JPH03112721U
Application number: JP1894490U
Authority: JP
Priority date: 1990-02-28
Filing date: 1990-02-28
Publication date: 1991-11-18

Description

[Brief explanation of drawings]

図面は本考案の実施例が示され、第１図は本考
案が適用される光走査装置の断面側面図、第２図
、第３図は本考案が適用される回転軸の側面図、
第４図は本考案の適用が除外される従来例回転軸
の側面図、第５図は才差運動の説明図、第６図は
第１図から回転部分のアセンブリを取り出した回
転軸の断面側面図、第７図は回転軸が回転中に軸
受との間隙に発生する空気圧の上昇分を示すグラ
フ、第８図は回転軸の各部分の数値を示す表図、
第９図は第６図中Ｘ軸をＯ点を起点として下方へ
移動した距りＳcmに対するＩｄ−Ｉｐの計算値の
グラフである。１……軸受、２……回転軸、３……ポリゴンミ
ラー、１２，１２′，１３……空気溝。 The drawings show an embodiment of the present invention; FIG. 1 is a cross-sectional side view of an optical scanning device to which the present invention is applied; FIGS. 2 and 3 are side views of a rotating shaft to which the present invention is applied;
Fig. 4 is a side view of a conventional rotating shaft to which the present invention is not applicable, Fig. 5 is an explanatory diagram of precession, and Fig. 6 is a cross-section of the rotating shaft with the rotating part assembly taken out from Fig. 1. A side view, Fig. 7 is a graph showing the increase in air pressure generated in the gap between the rotating shaft and the bearing while the rotating shaft is rotating, and Fig. 8 is a table showing numerical values for each part of the rotating shaft.
FIG. 9 is a graph of the calculated value of Id-Ip versus the distance Scm moved downward on the X axis in FIG. 6 from the point O. 1... Bearing, 2... Rotating shaft, 3... Polygon mirror, 12, 12', 13... Air groove.

Claims

[Scope of utility model registration request]

A driving device using an air dynamic pressure bearing having an air groove for generating dynamic pressure on the outer periphery of a rotating shaft, and a polygon mirror integrated with the rotating shaft so that its axis during rotation coincides with its central axis. In the scanning device, the air groove has a pair of groove groups in different directions or a groove group in only one direction to constitute a radial bearing supported at one point, and the end position of the air groove is
If there is a pair of air grooves with respect to the center of gravity in the direction of the rotation axis of the rotating part including the rotation axis and the polygon mirror, it is the center of the ends of both air grooves, and if it is only in one direction, it is the center of the ends, respectively. An optical scanning device configured to match within a range of ±0.15 cm.