Lens assembly with integrated feedback loop for focus adjustment

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 10712529
APP PUB NO 20140268361A1
SERIAL NO

13800055

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Abstract

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This invention provides a removably mountable lens assembly for a vision system camera that includes an integral auto-focusing liquid lens unit, in which the lens unit compensates for focus variations by employing a feedback control circuit that is integrated into the body of the lens assembly. The feedback control circuit receives motion information related to the bobbin of the lens from a position sensor (e.g. a Hall sensor) and uses this information internally to correct for motion variations that deviate from the lens setting position at a desired lens focal distance setting. Illustratively, the feedback circuit can be interconnected with one or more temperature sensors that adjust the lens setting position for a particular temperature value. In addition, the feedback circuit can communicate with an accelerometer that reads a direction of gravity and thereby corrects for potential sag in the lens membrane based upon the spatial orientation of the lens.

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Patent Owner(s)

Patent OwnerAddress
COGNEX CORPORATIONONE VISION DRIVE NATICK MA 01760

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Delasauce, Rene Aachen, DE 11 60
Equitz, William Brookline, US 18 189
Nunnink, Laurens Simpleveld, NL 127 1427

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