JPH046266U

JPH046266U -

Info

Publication number: JPH046266U
Application number: JP4664990U
Authority: JP
Priority date: 1990-05-02
Filing date: 1990-05-02
Publication date: 1992-01-21
Anticipated expiration: 2004-09-14
Also published as: JPH0635650Y2

Description

[Brief explanation of drawings]

第１図は本考案をポリゴンミラーの回転駆動装
置として実施した一例を示す中央縦断面図である
。第２図はバランスプレート通気孔を構成する溝
を設けた一実施例を示すもので、Ａは底面図、Ｂ
は側面図である。第３図Ａは溝加工の他の実施例
を示す要部拡大断面図、第３図Ｂはミラー押えの
他の実施例を示す要部拡大図である。第４図は本
考案の他の実施例に係り、ダンピングプレートを
用いた実施例の要部拡大断面図である。第５図Ａ
及びＢは第４図の実施例で使用するダンピングプ
レートの一例を示す平面図及び要部のみを示す説
明図である。第６図はダンパーが回転体の振動に
与える関係を示す振動特性図である。第７図は従
来の動圧空気軸受モータの一例を示す中央縦断面
図である。１……回転体、４……軸受部材、７……動圧空
気軸受、３……回転体の外周面、６……軸受部材
の内周面、１１……内部空間、１２……モータ外
部、１７……モータ、２……マグネツト、５……
コイル、１３……溝、２８……スリツト、２９…
…ダンパープレート。 FIG. 1 is a central vertical sectional view showing an example of the present invention implemented as a rotational drive device for a polygon mirror. Figure 2 shows an embodiment in which grooves forming balance plate ventilation holes are provided, where A is a bottom view and B is a bottom view.
is a side view. FIG. 3A is an enlarged cross-sectional view of a main part showing another example of groove processing, and FIG. 3B is an enlarged view of a main part showing another example of a mirror holder. FIG. 4 is an enlarged sectional view of a main part of another embodiment of the present invention using a damping plate. Figure 5A
and B are a plan view showing an example of a damping plate used in the embodiment of FIG. 4, and an explanatory view showing only the essential parts. FIG. 6 is a vibration characteristic diagram showing the relationship that the damper gives to the vibration of the rotating body. FIG. 7 is a central vertical cross-sectional view showing an example of a conventional hydrodynamic air bearing motor. DESCRIPTION OF SYMBOLS 1...Rotating body, 4...Bearing member, 7...Dynamic pressure air bearing, 3...Outer circumferential surface of rotating body, 6...Inner circumferential surface of bearing member, 11...Internal space, 12...Motor exterior , 17...Motor, 2...Magnet, 5...
Coil, 13...Groove, 28...Slit, 29...
...damper plate.

Claims

[Claims for Utility Model Registration] (1) A rotating body and a cylindrical bearing member that accommodates the rotating body are fitted to each other so that movement occurs between the outer circumferential surface of the rotating body and the inner circumferential surface of the bearing member. A compressed air bearing is configured, and a motor is configured between a magnet attached to the inner circumferential surface of the rotating body and a stator-side coil arranged concentrically at the center of the bearing member and fixed to the bearing member. In the compressed air bearing motor, an internal space formed by the rotating body and the bearing member is a substantially sealed space, and a groove that communicates the internal space with the outside of the motor is formed in a surface where the constituent members abut against each other. A dynamic pressure air bearing motor characterized in that it is formed in any one of the above. (2) A rotating body and a cylindrical bearing member that accommodates the rotating body are fitted together to form a hydrodynamic air bearing between the outer circumferential surface of the rotating body and the inner circumferential surface of the bearing member, and the In a hydrodynamic air bearing motor, the motor is constituted by a magnet attached to the inner circumferential surface of a rotating body and a stator side coil arranged concentrically at the center of the bearing member and fixed to the bearing member. The inner space formed by the bearing member and the bearing member is a substantially sealed space, and a damping plate having a radial slit that communicates the inner space with the outside of the motor is provided on either of the surfaces where the constituent members abut against each other. A dynamic pressure air bearing motor characterized by being interposed between the two.