SYSTEM FOR ADJUSTING FOCUS OF A LIQUID LENS IN A MACHINE VISION SYSTEM
First Claim
Patent Images
1. A system for performing a vision process using a camera, the system comprising:
- a liquid lens;
an imaging sensor; and
a mounting device for mounting the liquid lens a distance from the imaging sensor, wherein the mounting device is adapted to adjust a distance between the lens and the imaging sensor to adjust the focus of the lens.
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Abstract
A method and apparatus for recalibrating a liquid lens. In one embodiment, a lens holder is provided to adjust the focal length of the lens as a function of temperature. In another embodiment, a recalibration circuit including a second lens of similar characteristics to the imaging lens is used to determine an appropriate focus. In other embodiments, an open loop calibration process is used.
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Citations
20 Claims
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1. A system for performing a vision process using a camera, the system comprising:
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a liquid lens; an imaging sensor; and a mounting device for mounting the liquid lens a distance from the imaging sensor, wherein the mounting device is adapted to adjust a distance between the lens and the imaging sensor to adjust the focus of the lens. - View Dependent Claims (2)
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3. A system for performing a vision process using a camera, the system comprising:
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an imaging liquid lens having an imaging lens field of view in which the focus of the imaging liquid lens is adjustable; a calibration liquid lens having a calibration lens field of view that is focused on a target; an imaging sensor for imaging the target in the calibration lens field of view; a processor configured to adjust a focus of the calibration liquid lens, the processor being programmed to; receive imaging data from the calibration imaging sensor; evaluate the focus of the calibration liquid lens on the target and adjust the focus until the target is in focus; extract focus information from the calibration imaging sensor when the target is in focus; and provide a signal to adjust the focus of the imaging liquid lens based on the focus information. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10)
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11. A system for performing a vision process using a camera, the system comprising:
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a liquid lens having an imaging lens field of view where the focus of the liquid lens is adjustable; an imaging sensor for imaging the field of view; a target positioned at a predetermined location within the field of view; a processor receiving imaging data from the imaging sensor, the processor being programmed to; receive imaging data from the imaging sensor at the predetermined location in the field of view; evaluate the focus of the liquid lens on the target; and adjust the focus of the liquid lens until the target is in focus. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification