ENCODER DEVICE

摘要

An encoder device has a base unit for measuring the displacement of a member subject to measurement, and a back-up power source as the back-up power source for the main power source to supply power to the encoder base unit. A first battery supplies a first back-up voltage as the regulated voltage in respect of the back-up power source output terminal means. A second battery supplies a second back-up voltage, which is similar or lower than the first back-up voltage, when the output voltage of said first battery declines (Figure 1).