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Crossed Roller Bearings in Optical Inspection Systems
In optical inspection systems, positioning accuracy and rotational stability decide whether the camera captures a usable image. Crossed roller bearings in optical inspection systems support the rotary stage that carries the inspection target, holding it steady within the depth of field through every rotation. The rollers sit at right angles inside integrated one-piece rings, so a single bearing carries radial load, axial load, and tilting moment without the stack height of a paired arrangement.
These bearings are built for low runout and vibration-free rotation. Line contact between the rollers and the raceways spreads the load across a wide area, which keeps deflection low and removes the ball-pass excitation that couples into a camera mount. Factory-set preload eliminates internal clearance before the stage ever moves, so the bearing resists from the first increment of load and returns to the same angular position cycle after cycle. Available accuracy grades let the stage be matched to the optical resolution the system demands.
Yuanhe manufactures crossed roller bearings for optical inspection, metrology, and semiconductor inspection equipment. Our RAU integrated ring construction and factory preload deliver repeatable angular positioning, stable imaging, and long service life, helping equipment builders hold their inspection tolerances without adding bearings or adjustment steps to the assembly. The same design also serves linear motion and positioning stages where straight, repeatable travel matters as much as rotation.
Yuanhe delivers precision and stability in optical inspection systems
- RAU integrated one-piece rings hold the raceways true, keeping runout low across the full rotation
- Factory-set preload removes internal clearance, so the stage repeats the same angular position every cycle
- Line contact spreads load across the rollers, reducing deflection and vibration transmitted to the optics
- One bearing carries radial load, axial load, and tilting moment, saving stack height in a tight envelope
- Accuracy grades from P5 through P2 match the bearing to the optical resolution of the inspection system
- Sealed and open configurations suit both cleanroom inspection cells and enclosed lubricated stages
Bearing Options for an Inspection Rotary Stage
| Bearing Approach | Stack Height | Fit for Optical Inspection |
|---|---|---|
| RAU crossed roller bearing | Single unit | Combined load and moment in one ring, preload set at factory |
| Paired angular contact bearings | Double | Preload must be set on assembly, more parts to align |
| Deep groove ball bearing | Single unit | Point contact transmits ball-pass excitation to the optics |
For stages that only spin a light shaft rather than position an inspection target, standard deep groove ball bearings remain the efficient choice. The RAU series is specified where the stage must hold a precise position under combined load, which is the defining requirement of an optical inspection rotary axis.
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