G - Physics – 01 – D
Patent
G - Physics
01
D
G01D 5/347 (2006.01) G08C 21/00 (2006.01)
Patent
CA 2256231
The present invention represents a new method for reading the position of an encoding mask. This method significantly increases the resolution without increasing the encoding mask resolution. An array of light cells is placed at one side of an encoding mask and consists of the number N elements. An array of photocells is placed on the other side and also consists of number N elements. All cells in a photocell array are exposed in cell-by-cell order. The distance between cells in a light cell array is equal to the distance between cells in a photocell array. A photocell array is aligned with a light cell array. The output signal from a photocell array is made by summarizing the signals of each cell. The output signal from each cell is proportionate to the amount of the cell's surface being exposed. An encoding mask is designed in such a manner, that the output signal from a photocell array is a combination of the pulse and analog signals. Time position of the pulse signal gives the absolute position of the encoding mask above k cell in a photocell array and the phase shift of analog signal defines incremental position of an encoding mask between k and k+1 cells in a photocell array, where k is number of cell between 1 and N.
Bloechle Walter
Kourilovitch Andrei
Bloechle Walter
Hohner Corp.
Kourilovitch Andrei
LandOfFree
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