1
David I Dunthorn: Diffusion-assisted position location particularly for visual pen detection. Luedeka Neely & Graham, May 31, 1994: US05317140 (250 worldwide citation)

Systems and methods for optically determining the direction of an object, such as a pointer, relative to an imaging system, particularly systems where triangulation is employed to determine the location of a pointer within a generally planar viewing field, such as a touch screen. Rather than employi ...


2
Paul McAvinney, Dean H Rubine: VideoHarp. Sensor Frame Corporation, Reed Smith Shaw & McClay, November 6, 1990: US04968877 (204 worldwide citation)

The VideoHarp is an optical-scanning device for sensing and tracking the movement of multiple fingers which is then used to control the generation of light or sound or to control the motion of other physical objects. Preferably, the VideoHarp detects the images of a performer's fingertips using a si ...


3
Stephen J Horvath, Steven R Wilcox: Method and apparatus for evaluating and sorting sheets in a high speed manner. Brandt, Weinstein & Sutton, April 26, 1983: US04381447 (165 worldwide citation)

Electronic solid state circuitry incorporating the microprocessor for automatically controlling document handling apparatus. Sheets are advanced from a stack of sheets arranged in an infeed stacker and are moved one at a time at high speed through an examining location where sensors examine the shee ...


4
Russell F Lewis, Floyd H Hollister, Dale A Cone: Writing tip position sensing and processing apparatus. Texas Instruments Incorporated, W Daniel Swayze Jr, Leo N Heiting, Richard L Donaldson, March 15, 1994: US05294792 (159 worldwide citation)

A self-contained pen computer is provided that is capable of acquiring data representative of written strokes of the stylus of the pen and then recognizing the symbols associated with these pen strokes, or compacting these strokes. These recognized symbols or compacted strokes are stored in a memory ...


5
Paul Sandland, Kenneth Levy, Russell M Singleton, Michael L Hodgson, Gerald R Cutler: Electronic control of an automatic wafer inspection system. KLA Instruments Corporation, Hamrick Hoffman Guillot & Kazubowski, February 17, 1987: US04644172 (143 worldwide citation)

A system for automatic micro and macro inspection of patterned wafers, including a X-Y stage for supporting and positioning a wafer at a macro inspection station and a micro inspection station, a plurality of cassettes for storing a plurality of patterned wafers before and after inspection, a transf ...


6
Harald Philipp: Optical motion sensor. April 5, 1988: US04736097 (139 worldwide citation)

An optical motion sensor comprises first and second light emitting diodes that emit complementary pulsed beams of infrared energy within a sensing region. A photodiode sums the energies to produce a proportional sensing signal. An amplifier AC coupled to the photodiode blocks the constant portion of ...


7
Henry I Smith, Alberto M Modiano, Euclid E Moon: On-axis interferometric alignment of plates using the spatial phase of interference patterns. Massachusetts Institute of Technology, Fish & Richardson, May 9, 1995: US05414514 (138 worldwide citation)

There are first and second relatively movable plates. On a face of each of the first and second plates, there are first and second alignment marks, each being a linear grating of parallel lines of uniform spatial period, the spatial periods being different from each other. There is a light source fo ...


8
Jack Sacks, Ralph Weisner: Z-axis height measurement system. View Engineering, Bogucki Scherlacher Mok & Roth, May 10, 1988: US04743771 (138 worldwide citation)

This invention concerns an optical system for use with a television camera for detecting the surface location of an object. A preferred optical image having a distinct, unique, recognizable pattern is projected on a surface along a defined path that ultimately falls on an imaging sensor associated w ...


9
Terrill H Jones, Dale H Sundby, Steven A Wright: Combination mouse, optical scanner and digitizer puck. MARQ Technolgies, Baker Maxham Jester & Meador, March 6, 1990: US04906843 (135 worldwide citation)

A hand held unit can operate as a mouse to move a cursor on a display, as a hand held optical scanner for entering into a computer characters or graphic information delineated on a work sheet across which the unit is moved, or as a digitizing puck for tracing and digitizing lines or curves on a work ...


10
Morten J Jensen: Method and apparatus for measuring low power signals. Caliper Technologies Corporation, Townsend and Townsend and Crew, September 28, 1999: US05959291 (126 worldwide citation)

A method and apparatus for measuring very low light signals including integrating a signal from a photo diode, avalanche photo diode, photomultiplier tube or the like, digitally sampling the integrator output more than two times during each integration period, fitting a curve to the multiple digitiz ...