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公开(公告)号：US20210173127A1
公开(公告)日：2021-06-10
申请号：US16997289
申请日：2020-08-19
Applicant: COGNEX CORPORATION
Inventor： Laurens Nunnink , Mario Joußen
Abstract: Systems and methods reduce temperature induced drift effects on a liquid lens used in a vision system. A feedback loop receives a temperature value from a temperature sensor, and based on the received temperature value, controls a power to the heating element based on a difference between the measured temperature of the liquid lens and a predetermined control temperature to maintain the temperature value within a predetermined control temperature range to reduce the effects of drift. A processor can also control a bias signal applied to the lens or a lens actuator to control temperature variations and the associated induced drift effects. An image sharpness can also be determined over a series of images, alone or in combination with controlling the temperature of the liquid lens, to adjust a focal distance of the lens.
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Patent Agency Ranking
公开(公告)号：US11754755B2
公开(公告)日：2023-09-12
申请号：US16997289
申请日：2020-08-19
Applicant: COGNEX CORPORATION
Inventor： Laurens Nunnink , Mario Joußen
CPC classification number: G02B3/14 , G02B7/008 , G02B7/028 , G02B7/08 , G02B26/004
Abstract: Systems and methods reduce temperature induced drift effects on a liquid lens used in a vision system. A feedback loop receives a temperature value from a temperature sensor, and based on the received temperature value, controls a power to the heating element based on a difference between the measured temperature of the liquid lens and a predetermined control temperature to maintain the temperature value within a predetermined control temperature range to reduce the effects of drift. A processor can also control a bias signal applied to the lens or a lens actuator to control temperature variations and the associated induced drift effects. An image sharpness can also be determined over a series of images, alone or in combination with controlling the temperature of the liquid lens, to adjust a focal distance of the lens.
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公开(公告)号：US10754071B2
公开(公告)日：2020-08-25
申请号：US15375859
申请日：2016-12-12
Applicant: COGNEX CORPORATION
Inventor： Laurens Nunnink , Mario Joußen
Abstract: Systems and methods reduce temperature induced drift effects on a liquid lens used in a vision system. A feedback loop receives a temperature value from a temperature sensor, and based on the received temperature value, controls a power to the heating element based on a difference between the measured temperature of the liquid lens and a predetermined control temperature to maintain the temperature value within a predetermined control temperature range to reduce the effects of drift. A processor can also control a bias signal applied to the lens or a lens actuator to control temperature variations and the associated induced drift effects. An image sharpness can also be determined over a series of images, alone or in combination with controlling the temperature of the liquid lens, to adjust a focal distance of the lens.
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公开(公告)号：US10690816B2
公开(公告)日：2020-06-23
申请号：US15689145
申请日：2017-08-29
Applicant: COGNEX CORPORATION
Inventor： Laurens Nunnink , Mario Joußen , Jörg Kesten , Michael Haardt
Abstract: Systems and methods reduce temperature induced drift effects on a liquid lens used in a vision system. A feedback loop receives a temperature value from a temperature sensor, and based on the received temperature value, controls a power to the heating element based on a difference between the measured temperature of the liquid lens and a predetermined control temperature to maintain the temperature value within a predetermined control temperature range to reduce the effects of drift. A processor can also control a bias signal applied to the lens or a lens actuator to control temperature variations and the associated induced drift effects. An image sharpness can also be determined over a series of images, alone or in combination with controlling the temperature of the liquid lens, to adjust a focal distance of the lens.
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公开(公告)号：US10482296B1
公开(公告)日：2019-11-19
申请号：US16122133
申请日：2018-09-05
Applicant: COGNEX CORPORATION
Inventor： Mario Joußen , Jörg Kesten , Laurens Nunnink
IPC: G06K7/10
Abstract: A code reader includes an image acquisition system to acquire a plurality of images. A sensor detects motion of the code reader, and a processor is operatively coupled to the image acquisition system and the sensor. The processor performs a plurality of steps including associating a first detected motion data with one of the plurality of acquired images; associating a second detected motion data with a subsequent one of the plurality of acquired images; attempting to decode the one of the plurality of acquired images; determining if the second detected motion data is preferred over the first detected motion data; and attempting to decode the subsequent one of the plurality of acquired images when the second detected motion data is preferred over the first detected motion data.
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公开(公告)号：US20170090076A1
公开(公告)日：2017-03-30
申请号：US15375859
申请日：2016-12-12
Applicant: COGNEX CORPORATION
Inventor： Laurens Nunnink , Mario Joußen
Abstract: Systems and methods reduce temperature induced drift effects on a liquid lens used in a vision system. A feedback loop receives a temperature value from a temperature sensor, and based on the received temperature value, controls a power to the heating element based on a difference between the measured temperature of the liquid lens and a predetermined control temperature to maintain the temperature value within a predetermined control temperature range to reduce the effects of drift. A processor can also control a bias signal applied to the lens or a lens actuator to control temperature variations and the associated induced drift effects. An image sharpness can also be determined over a series of images, alone or in combination with controlling the temperature of the liquid lens, to adjust a focal distance of the lens.
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