Focus processing with the distance of different target wheels

Details Focus processing with the distance of different target wheels Focus processing with the distance of different target wheels

2007-07-24

2007-07-24

Evans, F. L. (Department: 2877)

Optics: measuring and testing

Lens or reflective image former testing

C356S125000

Reexamination Certificate

active

10929300

ABSTRACT:
An apparatus and method for automatically focusing a miniature digital camera module (MUT) is described. A MUT is loaded onto a test fixture and aligned with an optics system of a test handler. Focus targets contained within two target wheels are positioned over an optical centerline above the digital camera module using stepper motors. A field lens is positioned to focus an image of the targets onto the lens opening of the MUT. The image can be of a single target or a combination of targets contained on the target wheels at various optical distances from the MUT. A focusing unit adjusts the lens cap of the MUT for a best focus setting and after the MUT has been tested the best focus setting if physically fixed by permanently connecting the lens cap to the body of the MUT.

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