G - Physics – 01 – D
Patent
G - Physics
01
D
G01D 5/347 (2006.01) G08C 21/00 (2006.01)
Patent
CA 2257549
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 four elements. An array of photocells is placed on the other side and also consists of four elements. All cells in a photocell array are exposed in cell-by-cell order with 50% overlapping. 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 sine-wave shape analog signal. The phase shift of analog signal defines absolute position of an encoding mask above a photocell array.
Bloechle Walter
Hohner Corp.
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