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7693245 Frame-based carrier frequency and phase recovery system and method  
Header information is used to facilitate coarse frequency and frame recovery. The coarse frequency and frame recovery is thereafter utilized to perform adaptive phase and frequency synchronization...
7659888 Electronic apparatus and circuit substrate  
An electronic apparatus of the present invention has a first unit and a second unit coupled to the first unit through a coupling section which allows the second unit to be opened and closed...
7605805 Electrical touch sensor and human interface device using the same  
An electrical touch sensor is provided. The electrical touch sensor includes: a touch detection part having at least one touch pad and generating a first signal having a same delay time regardless...
7411581 Touch pad  
A touch pad (101) includes transducers (201-204) for receiving acoustic signals resulting from touch events, such as the continuous movement of a fingertip across the surface (105) of the touch...
7019672 Position sensor  
A low cost x-y digitising system is described for use in consumer electronic devices, such as portable digital assistants, mobile telephones, web browsers and the like. The digitizer includes a...
6999007 Linear position sensor  
In a linear position encoder, a support is provided upon which a pair of phase quadrature windings are mounted. The windings are arranged to have a sinusoidal magnetic sensitivity characteristic...
6980134 Signal processing apparatus and method  
Processing circuitry is provided for processing signals received from, for example, sense coils forming part of a position encoder used to encode the relative positions of two relatively movable...
6788296 Coordinate data entry device  
The present invention provides a coordinate data entry device comprising a plurality of receivers disposed in the vicinity of a board surface, and a position indicator to transmit signals, at least...
5920309 Touch sensing method and apparatus  
Method and apparatus for sensing the simultaneous proximity of one or more fingers or other appropriate objects to a capacitive touch sensor. A modulator/demodulator pair drive and sense either a...
5859392 Method and apparatus for reducing noise in an electrostatic digitizing tablet  
A method for reducing the effect of a noise impulse in a digitizing panel which includes a resistive layer is disclosed. The method includes the steps of generating a signal when an object is in...
5801340 Proximity sensor  
An improved capacitive sensor for detecting the presence of objects in a sensing region. The sensor is a multilayer structure with alternating layer of condutive and insulating materials. The...
5693913 Coordinate reader and method of detecting coordinates  
A coordinate reader comprises a coordinate detector body having at least one excitation line, at least one detection line, an exciting circuit connected to the excitation line for supplying an...
5691512 Position transducer, and method for eliminating noise therefrom  
A position transducer, and a noise elimination method for eliminating a noise component included in a received signal of the position transducer irrespective of the frequency band of the noise...
5684277 Coordinate input apparatus  
A coordinate input apparatus which can attain an accurate coordinate input operation, includes a sensor for detecting an input variation. The vibration is amplified, and an envelope detection...
5416280 Digitizer tablet using relative phase detection  
In a digitizer and method for laying out and using the tablet of the digitizer, wherein the tablet provides unambiguous binary code outputs. The digitizer may employe a cordless transducer and...
5345044 Cordless digitizer using electromagnetic locating signals  
In order to determine without ambiguity the grid sections on which the pointer is located in a cordless electromagnetic digitizer having x and y locating grids, a third, "phase" grid has conductors...
5329166 Coordinate reading system for detecting operation states of numerous switches  
The object of the present invention is to enable detecting operation states of numerous switches in a cordless coordinate reading system. The coordinate reading system body is provided with the...
5253187 Coordinate input apparatus  
A coordinate input apparatus in which a vibration which was input by a vibration input pen is detected by vibration sensors attached to a vibration propagating plate such as a transparent glass...
5247138 Cordless digitizer stylus status encoding and transmission scheme  
In a cordless digitizing system wherein a cordless stylus having a manually operable button thereon transmits positional pulses to a tablet at a carrier frequency this invention is apparatus for...
5245336 Digitizer with overlapped loop pattern and peak phase recognizer  
A digitizer comprising a microprocessor, a quartz oscillator, a cursor or stylus, an overlapped loop assembly, a peak phase recognizer, an analog/digit converter and other matching devices...
5235142 Phase reference system for cordless looping digitizer  
In a cordless, electro-magnetic digitizing system having a drive circuit outputting a square wave drive signal of known initial polarity to a transducer coil in a cursor to oscillate the transducer...
5220324 Wireless coordinate reader and switch state detection system for coordinate indicator  
A wireless coordinate reader composed of: a sense line plate having a plurality of excitation lines and a plurality of sense lines arranged thereon; a coordinate indicator including a resonant...
5218174 Low power cordless magnetic field digitizer with differential grid sensing and synchronous position demodulation  
A digitizing system includes a tablet and a cordless pointing device including a plurality of data grid conductors in the tablet and a plurality of clock grid conductors in the tablet, all...
5160813 Cordless digitizer local conductor phase reference system  
In an electro-magnetic, cordless digitizer system wherein a transducer emits an AC magnetic field which is detected by a first grid of scanned parallel first wires in a tablet to provide positional...
5124509 Digitizer with capacitive and inductive coupling  
A battery powered oscillator in a freely movable pointer drives a coil and a divider. A grid of spaced conductors in a base unit is inductively coupled to the coil. A conductive plate that lies...
5045645 Digitizer system with passive pointer  
A driving grid is driven by an ac signal comprising a carrier frequency modulated by a lower frequency. An untethered, batteryless pointer includes a pick-up coil in a first tuned circuit tuned to...
5012049 Position determining apparatus  
An apparatus for precisely locating the position of a transmitter either along a line, or a surface, or within a three dimensional space. More particularly the apparatus of the invention is adapted...
4990726 Digitized controller for position locator  
A digitizer tablet uses sequenced wire addressing to derive time-related voltages correlated to the location of the addressed wires. The voltages are digitized, and an algorithm followed to...
4885433 Position determining apparatus  
An apparatus for precisely locating the position of a transmitter within either a plane or within a three dimensional space. More particularly the apparatus of the invention is adapted for use with...
4795858 Device for determining position coordinates of points on a surface  
A device for determining position coordinates of points on a surface, have a cursor structure, a grid structure, and a signal processor. The cursor structure has a cursor coil and a signal...
4739303 Man-machine link for converting coordinates to phase differences representative of increments in the coordinates  
A tablet device provides a coordinate count. A link is provided for each of the coordinates, the link including a pulse signal generator for generating first and second pulse signals which have a...
4729108 Apparatus for determining a coordinate of a given point on a tablet  
A coordinate detection system is disclosed which comprises a pointer which is excited by current of a predetermined frequency. Two conductors are arranged on a tablet for producing voltages which...
4700022 Method and apparatus for determining the coordinates of a contact point on a resistive type semianalog sensitive surface  
A method and apparatus for determining the coordinates of a point of contact of an object on a semianalog sensitive surface. The coordinates are of a zone of contact of a conductive object such as...
4696048 Input device  
An input device has a matrix input unit having a plurality of switches for inputting a pattern, a signal generator for generating signals identifying the actuation of the switches, and a...
4692568 Digitizer using phase inversion detection system  
In an electromagnetic induction type digitizer having a winding coil for generating magnetic field, a tablet having a plurality of conductive lines, a scanning circuit for detecting phase inversion...
4603231 System for sensing spatial coordinates  
A system for sensing the spatial position of a moveable object with respect to an energized conductive surface whereby the spatial coordinates of the object are determined. The system provides a...
4570033 Polyphase digitizer  
A two dimensional digitizing system comprises two systems at right angles to each other, comprising two conducting grid structures each having three terminals A, B, and C, with the grid conductors...
4552991 Absolute position coordinate determining device employing a single phase difference measurement to determine cursor position  
A two dimensional digitizing system comprising two systems at right angles, each system having at least two conducting grid systems. Each grid system is comprised of a number of windings with a...
4473717 Digitizing system  
One digitizer grid pattern is used for each of two coordinate axes, i.e. X and Y. Each grid pattern is used for coarse and fine digitizing to determine cursor positioning on each respective axis....
4418242 Coordinate reading apparatus  
A coordinate reading apparatus is disclosed, which is comprised of a tablet including therein magnetic-field generating coils; a position detector responsive to magnetic fields induced by the...
4368352 Digitizer with floating scan  
A digitizer having a pointer or cursor driven by an alternating carrier signal and a grid of sequentially enabled parallel spaced conductors inductively coupled to the cursor in which enabling of...
4368351 Amplitude modulated digitizer  
A digitizer having a pointer or cursor driven by an alternating carrier signal and a grid of sequentially enabled parallel spaced conductors inductively coupled to the cursor includes an AM...
4289926 Transmitter for a telewriter  
The invention improves the signal-to-noise ratio of a telewriter transmitter without requiring a change in preexisting telewriter transmission equipment. The individual crosspoints of an orthogonal...
4243843 Coarse position digitizer  
A method and apparatus for determining graphical coordinates includes a grid of parallel spaced conductors, a switch in series with each conductor, a cursor having an alternating magnetic field for...
4227044 Pen status system for digitizer pen  
A pen status indicating system for a digitizer pen utilized in conjunction with a digitizer having a grid of spaced conductors positioned beneath a writing surface. The digitizer includes an...
4216352 Two coordinate position sensing systems  
A system for determining X and Y coordinate positions on a surface wherein a first transducer generates plane waves having electromagnetic fields associated therewith, which plane waves travel...
4185165 Low noise system and method for sequentially sensing induced signals in digitizer grid conductors  
A low noise system and method are provided for sequentially sensing induced signals in a plurality of digitizer grid conductors. The digitizer includes a coil disposed above the tip of a pen. The...
4129747 Human-machine interface apparatus  
A human-machine interface apparatus includes a first, or phase, surface with associated circuitry so devised that an alternating electrical field is created above the surface with its phase,...
4080515 Successively electromagnetically scanned x-y grid conductors with a digitizing system utilizing a free cursor or stylus  
A position digitizing device in which a cursor, moveable within a field generated by successively activated grid wires, developes a voltage from the field and, in conjunction with conditioning...
4054746 Electronic coordinate position digitizing system  
An electronic position measuring system is disclosed for use in a digitizer of the type which converts analog information in graphical form to digital information. The system provides small scale...
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