| 主权项 |
1. An optical encoder comprising:
a scale provided with a scale pattern that reflects or transmits light from a light source; and a sensor configured to receive the light from the scale pattern, the sensor and the scale being moved relatively to each other, wherein: the sensor is provided with a light-receiving element array including multiple light-receiving elements arranged in a relative movement direction of the sensor and scale; the light-receiving element array includes multiple light-receiving element groups each being constituted by two or more light-receiving elements whose outputs are added together, the multiple light-receiving element groups being arranged with a pitch P; and an intermediate pattern is provided between the scale and the sensor, the intermediate pattern including a first pattern to form a first light intensity distribution with a first spatial period shorter than the pitch P on the light-receiving element array and a second pattern to form a second light intensity distribution with a second spatial period longer than the pitch P on the light-receiving element array. |
