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公开(公告)号：US11309679B2
公开(公告)日：2022-04-19
申请号：US16612601
申请日：2018-05-09
Applicant: Novanta Corporation
Inventor： Jacob Litmanovic , Jason Bethel , Ross Wheeler , Patrick Kolsch
Abstract: An external optical feedback element (108) for tuning an output beam of a gas laser (102) having multiple wavelengths includes a partially reflective optical element (108) positioned on a beam path of the output beam (106) outside of an internal optical cavity of the gas laser (102), and a stage (114) to support the optical element and adjust rotation, horizontal tilt angle, and vertical tilt angle of the optical element with respect to the beam path. The output beam (106) is partially reflected at the optical element (108) and fed back into the internal optical cavity of the gas laser (102), with the intensity varying for multiple wavelengths and adjusted by changing rotation, horizontal tilt angle and vertical tilt angle of the optical element. Thereby, a variable feedback of the output beam into the internal optical cavity of the gas laser is provided, which leads to a selective output wavelength of the gas laser, either at a single line or at multiple lines simultaneously. This setup may allow to control the wavelength of a commercial CO2 gas laser without a modification of the laser itself by adding a coupled cavity with a wavelength selective element like a grating to the given gas laser resonator.
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公开(公告)号：US20210056660A1
公开(公告)日：2021-02-25
申请号：US17001149
申请日：2020-08-24
Applicant: Novanta Corporation
Inventor： Mo Chen , Kevin D. Bower
Abstract: A machine vision system that uses an imager to capture an optical image of a target object that may contain a liquid. The target object is illuminated by an illumination source positioned oppositely from the imager and a predetermined pattern is positioned between the illumination source and the target object so that the imager will capture optical images of the background pattern through any liquid positioned in the target object. A processor is programmed to analyze captured images to detect any distortions of the pattern that are attributable to the presence of a liquid in the target object.
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公开(公告)号：US20170294805A1
公开(公告)日：2017-10-12
申请号：US15467944
申请日：2017-03-23
Applicant: Novanta Corporation
Inventor： Paul A. Remillard , Andrew M. Goldman , Mark Lang
IPC: H02J13/00 , H04N21/4363 , H04N5/445 , H04H60/31 , H04B7/185 , H04N21/422 , H04W52/04
Abstract: A communication system that involves superimposing data over DC power. The data takes the form of high bitrate digital signals, where the bitrate is much higher than 0 Hz (DC); this separation allows the AC signal to be easily separated from the DC power. The physical system consists of a two conductor cable, and integration is modular, in that multiple slaves can be connected and disconnected to a master through a routing bus also comprising two conductors. The master can communicate bi-directionally with the slave(s), and the data is encoded using DC-balanced encoding in an FPGA. The data is sent to and from a differential signaling transmitter/receiver pairs at each end of the cable. The system is may be used with position sensors, and provides the benefit of reducing cable costs and sensor size due to the decrease in number of conductors and elimination of power components in the sensor.
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公开(公告)号：US10761293B2
公开(公告)日：2020-09-01
申请号：US15195156
申请日：2016-06-28
Applicant: NOVANTA CORPORATION
Inventor： David C. Brown
Abstract: A method is disclosed of fabricating a mirror for use in limited rotation motor systems, said method comprising the steps of providing a mirror structure including at least one wall section, and exposing the at least one wall section to a fluid etching agent to thereby provide chemical milling of the mirror structure.
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公开(公告)号：US12146773B2
公开(公告)日：2024-11-19
申请号：US17748203
申请日：2022-05-19
Applicant: Novanta Corporation
Inventor： Daniel J. Holmes , Paul A. Remillard , Deepak Surendran
Abstract: An opto-magnetic rotary position encoder includes a polarization optical encoder and a magnetic encoder, both configured for on-axis placement and operation with respect to a rotational axis of a rotating component. A polarization sensor digital control block and a magnetic sensor digital control block are configured and operative to combine polarizer channel position data and magnetic channel position data in a manner providing for one or more of (1) redundancy, (2) calibration, (3) monitoring performance of one channel in relation to the other channel, or (4) compensation or correction of one channel based on the other channel.
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Patent Agency Ranking
公开(公告)号：US12146771B2
公开(公告)日：2024-11-19
申请号：US17571958
申请日：2022-01-10
Applicant: Novanta Corporation
Inventor： William G. Thorburn
IPC: G01D5/34
Abstract: A rotary optical position encoder includes a source of a linear-polarized light beam, a polarization-sensitive detector, and a rotating retarder disposed for rotation between the source and the detector. The retarder is configured and operative to produce a polarized exit beam whose polarization state rotates at a rate greater than a rotation rate of the retarder, thereby for increased resolution over a similar encoder using a rotating polarizer element. In an example, when polarized light is incident upon a rotating half-wave retarder, the transmitted beam's polarization axis rotates at twice the rate of retarder rotation, resulting in an electrical detector output that varies four times per revolution. Resolution is improved accordingly, as a given detected increment at the output is produced by only one-half the physical rotation increment required for a simple polarizer.
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公开(公告)号：US12085382B2
公开(公告)日：2024-09-10
申请号：US17674169
申请日：2022-02-17
Applicant: Novanta Corporation
Inventor： Chia-Pin Liang
Abstract: A rotary position encoder includes a detection unit and a scale co-configured and co-operative to detect a relative rotational position and to generate a position output accordingly. The scale has a scale pattern according to a linear-feedback shift register (LFSR) pseudo-random code, which is a non-maximal length code having a seed value, tap positions, and modified least-significant bit position(s) of code words that satisfy rotary constraint by which each code word follows in sequence from the adjacent code word.
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公开(公告)号：US20220260365A1
公开(公告)日：2022-08-18
申请号：US17674169
申请日：2022-02-17
Applicant: Novanta Corporation
Inventor： Chia-Pin Liang
Abstract: A rotary position encoder includes a detection unit and a scale co-configured and co-operative to detect a relative rotational position and to generate a position output accordingly. The scale has a scale pattern according to a linear-feedback shift register (LFSR) pseudo-random code, which is a non-maximal length code having a seed value, tap positions, and modified least-significant bit position(s) of code words that satisfy rotary constraint by which each code word follows in sequence from the adjacent code word.
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公开(公告)号：US20240421650A1
公开(公告)日：2024-12-19
申请号：US18743478
申请日：2024-06-14
Applicant: Novanta Corporation
Inventor： David Coulson , Elliot Helms , Jackson Lamb
IPC: H02K3/42 , H02K1/2793 , H02K3/47
Abstract: A motor includes a rotor having a pattern of permanent magnetic portions, and a stator disposed proximate to the rotor. In some arrangements, a stator housing of the stator has a segmented backplane formed of a plurality of metal segments in electrically non-conducting (or non-electrically conductive) thermal contact to provide for heat transfer from the forcer coils to a separate stator mounting structure while minimizing eddy currents and associated effects in the stator housing. In some arrangements, the stator housing of the stator has a coil-housing portion for holding the coils and a distinct mounting portion for attaching the stator to a separate support structure, the coil-housing portion being of an electrically non-conductive material effective to provide for heat transfer from the forcer coils to the mounting portion while avoiding eddy currents and associated effects in at least the coil-housing portion of the stator housing.
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公开(公告)号：US20220221311A1
公开(公告)日：2022-07-14
申请号：US17571958
申请日：2022-01-10
Applicant: Novanta Corporation
Inventor： William G. Thorburn
IPC: G01D5/34
Abstract: A rotary optical position encoder includes a source of a linear-polarized light beam, a polarization-sensitive detector, and a rotating retarder disposed for rotation between the source and the detector. The retarder is configured and operative to produce a polarized exit beam whose polarization state rotates at a rate greater than a rotation rate of the retarder, thereby for increased resolution over a similar encoder using a rotating polarizer element. In an example, when polarized light is incident upon a rotating half-wave retarder, the transmitted beam's polarization axis rotates at twice the rate of retarder rotation, resulting in an electrical detector output that varies four times per revolution. Resolution is improved accordingly, as a given detected increment at the output is produced by only one-half the physical rotation increment required for a simple polarizer.
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