Abstract: A motor controller for controlling the operation of a three-phase permanent magnet synchronous electric motor, wherein the three-phase permanent magnet synchronous electric motor is characterized by three phases A, B, C, and further wherein the three-phase permanent magnet synchronous electric motor is driven by regulating three phase currents iA, iB and iC for the three phases A, B, C, respectively, the motor controller comprising: a three-phase power supply for supplying the three phase currents iA, iB and iC; a first sensor for sensing the phase current iA; a second sensor for sensing across the phase currents iB and iC; and a microcontroller for controlling the operation of the three-phase power supply so as to produce the three phase currents iA, iB and iC needed to operate the three-phase permanent magnet synchronous electric motor, wherein the microcontroller reads the outputs of the first sensor and the second sensor and adjusts operation of the three-phase power supply so as to produce phase currents

Abstract: A motor controller for controlling the operation of a three-phase permanent magnet synchronous electric motor, wherein the three-phase permanent magnet synchronous electric motor is characterized by three phases A, B, C, and further wherein the three-phase permanent magnet synchronous electric motor is driven by regulating three phase currents iA, iB and iC for the three phases A, B, C, respectively, the motor controller comprising: a three-phase power supply for supplying the three phase currents iA, iB and iC; a first sensor for sensing the phase current iA; a second sensor for sensing across the phase currents iB and iC; and a microcontroller for controlling the operation of the three-phase power supply so as to produce the three phase currents iA, iB and iC needed to operate the three-phase permanent magnet synchronous electric motor, wherein the microcontroller reads the outputs of the first sensor and the second sensor and adjusts operation of the three-phase power supply so as to produce phase currents

Abstract: A motor controller for controlling the operation of a three-phase permanent magnet synchronous electric motor, wherein the three-phase permanent magnet synchronous electric motor is characterized by three phases A, B, C, and further wherein the three-phase permanent magnet synchronous electric motor is driven by regulating three phase currents iA, iB and iC for the three phases A, B, C, respectively, the motor controller comprising: a three-phase power supply for supplying the three phase currents iA, iB and iC a first sensor for sensing the phase current iA; a second sensor for sensing across the phase currents iB and iC; and a microcontroller for controlling the operation of the three-phase power supply so as to produce the three phase currents iA, iB and iC needed to operate the three-phase permanent magnet synchronous electric motor, wherein the microcontroller reads the outputs of the first sensor and the second sensor and adjusts operation of the three-phase power supply so as to produce phase currents

Abstract: A motor controller for controlling the operation of a three-phase permanent magnet synchronous electric motor, wherein the three-phase permanent magnet synchronous electric motor is characterized by three phases A, B, C, and further wherein the three-phase permanent magnet synchronous electric motor is driven by regulating three phase currents iA, iB and iC for the three phases A, B, C, respectively, the motor controller comprising: a three-phase power supply for supplying the three phase currents iA, iB and IC a first sensor for sensing the phase current iA; a second sensor for sensing across the phase currents iB and iC; and a microcontroller for controlling the operation of the three-phase power supply so as to produce the three phase currents iA, iB and iC needed to operate the three-phase permanent magnet synchronous electric motor, wherein the microcontroller reads the outputs of the first sensor and the second sensor and adjusts operation of the three-phase power supply so as to produce phase currents

Abstract: A method and device are provided that simulate the back-scattered light patterns reflected from the surface of a bar code when a bar code scanner passes a pulse of light across its surface. The bar code simulator includes a detector for detecting the presence of a bar code scanner and a light source for emitting a sequence of light patterns simulating light reflected from a bar code. The bar code simulator includes circuitry to detect operating characteristics of bar code scanners and of the environment such that the bar code simulator functions properly with any variety of bar code scanners and is tolerant of operator and environment.

Abstract: A sourceless orientation sensor having an azimuthal sensor which determines the azimuthal orientation relative to a planetary magnetic field, and a tilt sensor which determines the direction and magnitude of the displacement from vertical using the planetary gravitational field. The tilt sensor includes a transparent gas and a transparent viscous fluid in a spherical shell, a light emitting diode (LED) mounted at the top of the shell, and four photodetectors mounted at the bottom of the shell. As the tilt sensor is rotated the path of the light cone emanating from the LED and refracting at the gas/fluid interface is altered, thereby altering the intensity of light incident on the photodetectors. The magnitude of the light incident on the photodetectors is processed to provide the tilt angles. A thin transparent disk floats at the gas/fluid interface to damp surface waves caused by reorientation of the device.

Abstract: A computer system is provided which allows keyboard access in a hands-free environment. An orientation sensor is mounted on a headset and provides a cartesian positional input to an interface. The device functions in either a cursor control mode or a keyboard simulation mode. In keyboard simulation mode, positional inputs are converted to keyboard input codes which are input to a standard keyboard controller. The key codes generated are displayed to a user on an LED display. A microphone on the headset connects to voice control circuitry of the interface which allows input selections to be made through voice commands. A user locates the desired keyboard input by observing the LED display and selects the input with a vocal command. RAM memory storage of keyboard inputs allows the system to appear as a manual keyboard from the perspective of the keyboard controller.

Abstract: A hand-held device for controlling cursor movement on a data terminal having a display. An internal orientation sensor provides an electrical signal that is related to the orientation of the device without it being adjacent to any fixed surface. The orientation sensor includes a hollow spherical housing having at least one LED and one phototransistor mounted opposingly in the inner wall, along an axis extending through the center point of the housing. The housing is half-filled with a transparent liquid having a specified viscosity and index of refraction and half-filled with air. A light beam emitted from the LED is refracted upon passing through the boundary between the air and the liquid. As the orientation sensor rotates with respect to the vertical axis, the changing refraction angle of the light beam causes the phototransistor to detect changing intensities of light, which are representative of the angle of rotation.

Abstract: A device for controlling a cursor on a data terminal display screen. The device is in the form of a headset and includes an orientation sensor which provides an electrical signal related to the orientation of the device without it being adjacent to any fixed surface. The orientation sensor includes a hollow spherical housing having at least one light source/detector pair mounted opposingly in the inner wall, along an axis extending through the center point of the housing. The housing is half-filled with a transparent liquid having a specified viscosity and index of refraction and half-filled with air. Light beams emitted from the sources are refracted upon passing through the boundary between the air and the liquid. As the orientation sensor rotates with respect to the vertical axis, the changing refraction angle of the light beam causes the detector to sense changing intensities of light, which are representative of the angle of rotation.

Abstract: A device for controlling a cursor on a data terminal display screen. The device is in the form of a headset and includes an orientation sensor which provides an electrical signal related to the orientation of the device without it being adjacent to any fixed surface. The orientation sensor includes a hollow spherical housing having at least one light source/detector pair mounted opposingly in the inner wall, along an axis extending through the center point of the housing. The housing is half-filled with a transparent liquid having a specified viscosity and index of refraction and half-filled with air. Light beams emitted from the sources are refracted upon passing through the boundary between the air and the liquid. As the orientation sensor rotates with respect to the vertical axis, the changing refraction angle of the light beam causes the detector to sense changing intensities of light, which are representative of the angle of rotation.

Abstract: An electrographic system comprises a graphics surface assembly having a graphics surface integrally coupled to a memory device which contains calibration data designated for the graphics surface. During manufacturing, the memory device is mounted onto an interface board which is attached to the graphics surface through a flex cable. A calibration procedure is performed on the graphics surface whereby calibration data is generated and stored in the memory device. The memory device, loaded with the calibration data, is thereafter linked to its associated graphics surface.

Abstract: A device for controlling a cursor on a data terminal display screen. The device is in the form of a headset and includes an orientation sensor which provides an electrical signal related to the orientation of the device without it being adjacent to any fixed surface. The orientation sensor includes a hollow spherical housing having at least one light source/detector pair mounted opposingly in the inner wall, along an axis extending through the center point of the housing. The housing is half-filled with a transparent liquid having a specified viscosity and index of refraction and half-filled with air. Light beams emitted from the sources are refracted upon passsing through the boundary between the air and the liquid. As the orientation sensor rotates with respect to the vertical axis, the changing refraction angle of the light beam causes the detector to sense changing intensities of light, which are representative of the angle of rotation.

Abstract: A cursor positioning device for a computer system having a projection display monitor including a screen. A light pointer in the form of an elongated housing is positioned with its tip at a selected location on the screen. A light sensor detects the raster scan trace and transmits a timed electrical signal to an interface, which determines the coordinates of the selected location for use by a computer in controlling the position of the cursor on the projection screen.

Abstract: A reflective screen with a gradient of reflectivity is moved by a control handle outside a cabinet to display different parts of the screen through a window to a LED and a phototransistor. The changing of the light reflected by the screen from the LED to the phototransistor is used to control an electrical parameter, providing a low cost control device.

Abstract: An autoilluminating rechargeable lamp system includes a set of one or more self-standing rechargeable lighting fixtures (luminaries) removably supported on a recharging and support member. The luminaries each include a light diffusor that may resemble a candle that turn on when removed from the recharging and support member. The luminaries may also turn on when power to the recharging and support member is turned off, turning the luminaries on automatically as during a power failure. The luminaries may each be inductively coupled to the recharging and support member, which enables to provide an aesthetically pleasing interface free of electrical contacts.