Importance

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Abstract

Systems and methods to reduce manufacturing and assembly costs for measures to avoid blocking or creeping ball conditions for linear ball bearings are disclosed. In preferred embodiments two linear ball bearings, a fixed ball bearing and a non-locating ball bearing, are applied to guide movements of a lens barrel of camera modules. Ball cages, which are integrated either in a moving part or in a fixed part of an actuator, are lowering manufacturing and assembly costs. A constant magnetic preload force is applied to both ball bearings to keep the bearings together in case of a mechanic shock. Ball bearing contact points of the fixed ball bearing are shifted asymmetrically by a small angle to withstand horizontal preload forces.

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First Claim