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| Number | Title | Issue Date |
| 4397033 | Device for measuring characteristic parameters of the speed of handwriting This device comprises two pairs of superimposed pick-up coils 1, 2, 5, 6. Each pair is formed by two windings coupled in series but with opposing winding directions, each winding of one pair having a layer of rectilinear conductive portions 1a, 2a, 5a, 6a... | 08/02/1983 |
| 4378465 | Apparatus for generating a signal representative of a co-ordinate position of a movable indicating member Apparatus is disclosed for generating a signal representative of a co-ordinate position of a movable indicating member, the member being constructed for interacting magnetically with sensing coils. The apparatus includes a plurality of sensing coils (2 to... | 03/29/1983 |
| 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 demodulator for detecting the instantaneous time of change of pha... | 01/11/1983 |
| 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 the conductors is initiated at an origin conductor and cont... | 01/11/1983 |
| 4363023 | Electromagnetic device for measuring the speed of handwriting The sensor element of this device comprises at least two electrical conductor windings (Ex) and (Ey) which are superposed. Each of these windings is shaped so as to have a rectilinear portion over at least one portion of its length a... | 12/07/1982 |
| 4298772 | Coordinate reader using adjustable magnetostrictive oscillations A coordinate reader comprising: a magnetostrictive plate, a plurality of excitation means each including at least three coils mounted on the magnetostrictive plate in two directions of coordinate axes along its marginal edges for generating magnetostricti... | 11/03/1981 |
| 4273954 | Coordinate reading device A coordinate reading device including magnetostrictive vibration transmission media to attain coordinate readings of analog figures. A fixed magnetizing coil is wound about or placed on the surface of the media to automatically magnetize the media. A prep... | 06/16/1981 |
| 4260852 | Up/down scanning digitizing apparatus and method A digitizing system includes a plurality of spaced parallel grid conductors embedded beneath a support surface. A movable pen coil powered by an amplifier induces AC signals in the grid conductors. The grid conductors are scanned at a first rate from a re... | 04/07/1981 |
| 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 inducing an electric current in conductors over which it ... | 01/06/1981 |
| 4240065 | Position sensing apparatus Position sensing apparatus comprising two coil arrangements movable relative to each other, the first arrangement being a side-by-side array of elongate coil loops defining a writing area and the second coil arrangement being a single or multiple coil loo... | 12/16/1980 |
| 4213005 | Digitizer tablet A system for precisely determining the location of a cursor on a work surface with respect to a grid of coordinate conductors. The system is based on the time-distance relationship of current sheets caused to move sequentially along each axis of the work ... | 07/15/1980 |
| 4210775 | Method and apparatus for digitizing the location of an instrument relative to a grid A method and apparatus are provided for converting a position of a pen to a digital number representing the pen position with respect to a grid of conductors. A coil disposed above the tip of the pen is driven by a continuous AC input voltage of fixed fre... | 07/01/1980 |
| 4206314 | Graphic digitizer An X-Y coordinate position locating or measuring digitizing device in which a cursor (inductor), moveable within an electromagnetic field generated by successively activated grid wires, develops a voltage from the field, and, in conjunction with condition... | 06/03/1980 |
| 4186272 | Code generator A code generator which has a plurality of selectable areas on an information plane of an information plate formed with a magnetostrictive material. At least one exciting winding is wound on the information plate at one end thereof for causing at least one... | 01/29/1980 |
| 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 coil induces the signals in the grid conductors. The system... | 01/22/1980 |
| 4143240 | Co-ordinate plate for co-ordinate reader A co-ordinate plate for a co-ordinate reader, which utilizes delays of oscillation waves in a magnetostrictive material. The co-ordinate plate is composed of a thin plate of magnetrostrictive material having a co-ordinate plane and similar propagation cha... | 03/06/1979 |
| 4138592 | Electromagnetic detection line digitizer A graphic curve digitizer is disclosed wherein the x-y coordinate values of a response curve (made electrically conductive) are obtained by a digitally controlled x-y conductive probe and electronic system sensing when the probe contacts the curve by the ... | 02/06/1979 |
| 4112597 | Apparatus for enabling the motion of a scriber to be reproduced Apparatus to teach students to write includes a housing having a generally horizontally disposed, dielectric, translucent plate having a flat face over which a scribe can be moved and which receives a sheet of translucent, tracing paper. The same housing ... | 09/12/1978 |
| 4110556 | Graphical input devices A graphical input device is described which has a large surface divided into main regions and a small cursor divided into sub-regions. In one embodiment both the large surface and the cursor contain conductors to sense the position of a stylus used for in... | 08/29/1978 |
| 4088842 | Automatic coordinate determining device A device for detecting position coordinates of patterns such as graphs and characters which are plotted on a drawing media. The device includes a tablet on which a plurality of conductive lines are installed parallel to each other, and a probe positionabl... | 05/09/1978 |
| 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 circuits, yields the electrical intelligence required to indic... | 03/21/1978 |
| 4061966 | Method and apparatus for generating a continuous magnetic field determining the position of an inductive sensing element therein A technique for sensing the relative position of a cursor or other indicator integral with an inductive sensing element along at least one coordinate of a specified area is described. An array of conductors are sequentially arranged along the coordinate a... | 12/06/1977 |
| 4029899 | Position indicator A graphical input device for computer aided displays is described in which the area of interest is divided by the conductors of two orthogonal sets of coils. Each region of the of interest area is within a coil or combination of coils in each set unique t... | 06/14/1977 |
| 3956588 | Digitizing graphic system using magnetostrictive transducers A digitizing graphic system including a digitizing area, first and second coordinate arms extendable over the area, first and second magnetostrictive elements each positioned respectively in the first and second coordinate arms. A positionable device is m... | 05/11/1976 |
