JPS63194556U

JPS63194556U -

Info

Publication number: JPS63194556U
Application number: JP8416187U
Authority: JP
Priority date: 1987-05-30
Filing date: 1987-05-30
Publication date: 1988-12-14

Description

[Brief explanation of the drawing]

第１図は本考案の空気軸受をポリゴンミラース
キヤナーに適用した１実施例を示す断正面図、第
２図は従来の空気軸受の簡略化した断正面図、第
３図はスリーブのスラスト荷重とスラスト変位量
の関係を示すグラフ図である。図中、１はスリーブ、２はラジアル内周面、３
は軸体、５はラジアル外周面、６は動圧発生用の
溝、７は駆動用永久磁石、９は駆動コイル、１０
はヨーク、１２はハウジング、１３は軸承部材、
１４はケーシング、１５は窓部、１６は光透過板
、１７はヨーク取付体、１８はバランスリング、
１９は受け座、２０はポリゴンミラー、２１はバ
ランスリング、２２はネジ、２３は磁石支持体、
２４は第１の永久磁石、２５は軸承体、２６は第
２の永久磁石である。 Fig. 1 is a cross-sectional front view showing an embodiment of the air bearing of the present invention applied to a polygon mirror scanner, Fig. 2 is a simplified cross-sectional view of a conventional air bearing, and Fig. 3 is a thrust load on the sleeve. FIG. 3 is a graph diagram showing the relationship between the amount of thrust displacement and the amount of thrust displacement. In the figure, 1 is the sleeve, 2 is the radial inner peripheral surface, and 3 is the sleeve.
is a shaft body, 5 is a radial outer peripheral surface, 6 is a groove for generating dynamic pressure, 7 is a permanent magnet for driving, 9 is a driving coil, 10
is a yoke, 12 is a housing, 13 is a bearing member,
14 is a casing, 15 is a window, 16 is a light transmitting plate, 17 is a yoke mounting body, 18 is a balance ring,
19 is a receiving seat, 20 is a polygon mirror, 21 is a balance ring, 22 is a screw, 23 is a magnet support,
24 is a first permanent magnet, 25 is a shaft bearing, and 26 is a second permanent magnet.

Claims

[Scope of Claim for Utility Model Registration] A sleeve on the rotating side having a radial inner circumferential surface, a shaft body on the stationary side having a radial outer circumferential surface cooperating with the radial inner circumferential surface, and fixed to the outer circumferential surface of the sleeve. a driving permanent magnet, a driving coil for rotating the sleeve in cooperation with the driving permanent magnet, and a yoke around which the driving coil is wound, and between the driving permanent magnet and the yoke. In the air bearing, in which the sleeve is levitated and held by a magnetic holding force, a first permanent magnet is fixed to one end surface of the sleeve and is spaced apart from the first permanent magnet by a predetermined distance. A second permanent magnet is fixedly installed so as to face each other, and magnetic repulsion or magnetic attraction between the first and second permanent magnets causes magnetic force between the driving permanent magnet and the yoke. An air bearing characterized in that the floating position of the sleeve in the thrust direction is determined slightly against a holding force.