Inventor: Nils Ingvar Andermo

Address: Kirkland, WA
No. of patents: 23
Last patent issue date: 08/21/2007

Number	Title	Issue Date
7259695	Low-profile multi-turn encoder systems and methods Various alternative embodiments of a multi-turn capacitive encoder device are disclosed. The device includes two members that are fixed relative to each other and that include respective capacitive electrodes that are capacitively coupled between the two members. Th...	08/21/2007
6892590	Single-balanced shield electrode configuration for use in capacitive displacement sensing systems and methods A capacitive encoder includes a signal-balanced shield electrode configuration that does not require electrical ground connection or active sensing and control in order to maintain the shield electrode(s) at a sufficiently constant voltage during capacitive position...	05/17/2005
6400138	Reduced offset high accuracy induced current absolute position transducer A reduced offset absolute position transducer has at least one magnetic field generator that generates a first changing magnetic flux in a first flux region. A plurality of coupling loops have a first plurality of coupling loop portions spaced at a first ...	06/04/2002
6329813	Reduced offset high accuracy induced current absolute position transducer An inductive absolute position sensor has at least one magnetic field generator that generates a first changing magnetic flux in a first flux region. A plurality of coupling loops have a first plurality of coupling loop portions spaced at an interval rela...	12/11/2001
6304832	Symmetric sampling The invention provides a method of sampling precision measurement signals to achieve an accurate measurement position at a particular measurement time, such that the measurement accuracy is unaffected by the velocity of motion. The method involves samplin...	10/16/2001
6271661	Absolute position transducer having a non-binary code-track-type scale An absolute position transducer system has two members movable relative to each other and includes a code track transducer and at least one fine wavelength transducer. The code track is arranged to form a sequential pattern of base-N code words, where N i...	08/07/2001
6242906	Systems and methods for calibrating an absolute position encoder Methods and systems for calibrating an absolute position encoder where a read head is moved relative to a scale of the absolute position encoder and the absolute position encoder is comprised of a fine scale and a coarse scale. An absolute position of a c...	06/05/2001
6054851	Induced current absolute position transducer method using a code-track-type scale and read head A high-accuracy inductive absolute position transducer system has two members movable relative to each other and includes a code track transducer and may include a fine track transducer. The code track transducers includes a code track transmitter winding...	04/25/2000
6049204	Electronic linear scale using a reduced offset high accuracy induced current position transducer An electronic linear scale having a reduced offset position transducer that uses at least one coupling loop on a scale to inductively couple a transmitter winding on a read head to one or more receiver windings on the read head. The transmitter winding ge...	04/11/2000
6029363	Self-calibrating position transducer system and method A self-calibrating position transducer system and method uses the position transducer itself as a position reference during calibration, thus eliminating using an external reference during calibration. The transducer signals are sampled at a plurality of ...	02/29/2000
6011389	Induced current position transducer having a low power electronic circuit An inductive transducer system for use in high accuracy applications such as linear or rotary encoders, employs two members movable relative to each other. A first, active member induces eddy currents in a second, passive member that lacks a power source ...	01/04/2000
6005387	Reduced offset high accuracy induced current position transducer A reduced offset position transducer uses at least one coupling loop on a scale to inductively couple a transmitter winding on a read head to one or more receiver windings on the read head. The transmitter winding generates at least one primary magnetic f...	12/21/1999
6002250	Electronic linear scale using a self-contained, low-power inductive position transducer An electronic linear scale, which uses an induced current position transducer, includes a slider assembly mounted adjacent to an elongated beam. The slider assembly is mounted on one mounting member of a device such as a machine tool. The elongated beam i...	12/14/1999
5998990	Pitch-compensated induced current position transducer A pitch-compensated induced current position transducer includes a scale having a plurality of scale elements arranged along a measuring axis and a read head positioned adjacent to and movable relative to the scale. The read head has a transmitter winding...	12/07/1999
5973494	Electronic caliper using a self-contained, low power inductive position transducer An electronic caliper using a low power induced current position transducer includes a slider assembly mounted on an elongated beam with first and second measuring jaws projecting from the main beam and slider assembly. The position of the slider assembly...	10/26/1999
5948105	Method for conserving power by adjusting clock frequency based on a repetitive timing cycle Power saving methods for a battery powered electronic measurement system includes controlling the clock speed for different subsystems of the electronic measurement system and controlling the timing cycles of a controller of the electronic measurement sys...	09/07/1999
5936399	Inductive position transducer having a multi-tap receiver winding An induced current position transducer has a multi-tap winding. The multi-tap winding allows for digital interpolation of position to a small fraction of a wavelength, thereby reducing the amount of analog interpolation performed by the transducer electro...	08/10/1999
5901458	Electronic caliper using a reduced offset induced current position transducer An electronic caliper having a reduced offset position transducer that uses two sets of coupling loops on a scale to inductively couple a transmitter winding on a read head on a slide to one or more receiver windings on the read head. The transmitter wind...	05/11/1999
5894678	Electronic linear tape measure using a low power induced current position transducer An electronic linear tape measure using a low power induced current position transducer. The tape measure includes an enclosure case with a lateral slot through which the tape blade can be pulled. The tape blade is wound inside the enclosure case on a tap...	04/20/1999
5886519	Multi-scale induced current absolute position transducer An inductive absolute position transducer system, usable in high accuracy applications such as linear encoders, has two members movable relative to each other and includes three inductive position transducers. Each inductive position transducer includes a...	03/23/1999
5841274	Induced current absolute position transducer using a code-track-type scale and read head A high-accuracy inductive absolute position transducer system has two members movable relative to each other and includes a code track transducer and may include a fine track transducer. The code track transducer includes a code track transmitter winding ...	11/24/1998
5731707	Method and apparatus for synthesizing spatial waveforms in an electronic position encoder A method and apparatus for synthesizing spatial waveforms in electronic position encoders allows the position of a composite spatial waveform applied to an electronic position transducer to be incremented by amounts less than the pitch of the electrodes o...	03/24/1998
5670887	Method and apparatus for fast sampling in capacitive position transducers The fast sampling method for taking a position measurement with an electronic measurement system incorporating a capacitive position transducer of this invention allows such capacitive position transducers to be used in contaminant filled environments, su...	09/23/1997

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Inventor: Nils Ingvar Andermo