Tsinghua University

Hiwin Mikrosystem Corporation

Sheng-Ching Wang

Jen-Yuan Chang

Tsung-Shune Chin

Cheng-Kuo Sung

Heng-Sheng Hsiao

Cheng-Yi Lin

Chi-Yuan Cheng

An absolute position readout apparatus includes an encoder device and a readout device. The readout device includes multiple first and second magnetic sensing components that correspond to an absolute track of the encoder device, and a third magnetic sensing component and a fourth magnetic sensing components that correspond to an incremental track of the encoder device. The third magnetic sensing component is configured to be spaced apart from the fourth magnetic sensing component by a specific distance, so as to prevent misreading of absolute position information from the first or second magnetic sensing components being at positions corresponding to boundaries between adjacent magnetized regions of the absolute track.

Absolute position readout apparatus

An absolute position detecting device and method are provided. The absolute position detecting device utilizes the incremental magnetization on a magnetic encoding ruler with two different pole widths, such that elliptical Lissajous curves may be obtained by magnetoresistive sensors. The absolute position may be obtained by determining the region of the signals on the ellipses read by the magnetoresistive sensors.

Absolute position detecting device and method

Growing community of inventors

Taichung, Taiwan

Sheng-Ching Wang