JPH0351217U

JPH0351217U -

Info

Publication number: JPH0351217U
Application number: JP11268689U
Authority: JP
Priority date: 1989-09-26
Filing date: 1989-09-26
Publication date: 1991-05-17

Description

[Brief explanation of drawings]

第１図〜第３図はこの考案を具体化した一実施
例を示すものであり、第１図は回転多面鏡及びそ
の駆動モータを示す断面図、第２図は溝形状を示
す部分平面図、第３図はレーザープリンタの概略
を示す斜視図である。第４図及び第５図はこの考
案を具体化した別の実施例における回転多面鏡及
びその駆動モータを示す断面図である。１２……ラジアル軸受け体、１３，１４……ス
ラスト軸受け体、１５……回転体、２０……溝、
２１，２２……放射状溝、２３……ラジアル対向
面、２５……スラスト対向面、２４，２６〜２８
……リング片、２９……円板片、Ｃ１，Ｃ２……
クリアランス。 Figures 1 to 3 show an embodiment of this invention, with Figure 1 being a sectional view showing a rotating polygon mirror and its drive motor, and Figure 2 being a partial plan view showing the groove shape. , FIG. 3 is a perspective view schematically showing the laser printer. FIGS. 4 and 5 are cross-sectional views showing a rotating polygon mirror and its drive motor in another embodiment embodying this invention. 12... Radial bearing body, 13, 14... Thrust bearing body, 15... Rotating body, 20... Groove,
21, 22... Radial groove, 23... Radial opposing surface, 25... Thrust opposing surface, 24, 26-28
...Ring piece, 29...Disk piece, C1, C2...
clearance.

Claims

[Claims for Utility Model Registration] A radial bearing body 12, a rotating body 15 rotatably disposed around the axis of the radial bearing body 12, and a thrust bearing body that restricts movement of the rotating body 15 in the axial direction. 13, 14, and provided on either one of the opposing surfaces of the rotating body 15 and the radial bearing body 12 and the opposing surface of the rotating body 15 and the thrust bearing bodies 13, 14, and A groove 20 for introducing air into the clearance C1 between the body 15 and the radial bearing body 12, and a groove 21 for introducing air between the rotating body 15 and the thrust bearing bodies 13 and 14 to form a clearance C2. . At least one of the radial opposing surface 23, which is a surface facing the radial bearing body 12, and the thrust opposing surface 25, which is a surface facing the thrust bearing body 13, is partially or entirely formed of a ceramic material. Dynamic pressure type air bearing structure.