Patent ID: 9518842
Filing Date: 2016-12-13
CPC Classification: G01D

Claim Text:
1. A linear encoder device that includes a linear scale and a reference mark, the linear encoder device comprising: a synchronization signal generation unit configured to generate a pulse in a synchronization signal, wherein the pulse is synchronized with a movement distance when a first sensor installed to face the linear scale is moved along the linear scale based on a signal output by the first sensor; a reference signal generation unit configured to generate a reference signal indicating that the reference mark is detected based on a signal output by a second sensor installed along with the first sensor; and a reference position detection unit configured to set an internal signal when the reference signal generation unit generates the reference signal, generate a reference position signal indicating that a reference position decided in advance is detected when the pulse is generated in the synchronization signal while the internal signal is set, and reset the internal signal in accordance with an end of the pulse of the synchronization signal.