Linear encoder device and reference position detection method

A reference position detection method performed by a linear encoder device including a linear scale, a reference mark, 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, and 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, the reference position detection method comprising:

• a reference position detection step of setting an internal signal when the reference signal generation unit generates the reference signal, generating a reference position signal indicating that a reference position decided in advance is detected when the pulse is generated while the internal signal is set, and resetting the internal signal in accordance with an end of the pulse of the synchronization signal.