Patent ID: 9304019
Filing Date: 2016-04-05
CPC Classification: G01D,G02B,G05B,H04N

Claim Text:
1. A rotation detection apparatus comprising: a rotatable member rotatable with rotation of a motor and provided in its rotational direction with multiple pattern element portions forming a pattern for rotation detection; a signal outputter configured to output a detection signal changing in response to rotation of the pattern element portions with rotation of the rotatable member; a memory storing multiple correction values each provided for each of the pattern element portions and used to perform correction of an error in a relation between rotational positions of the rotatable member and the change of the detection signal, the error being caused by an arrangement error of the pattern element portions on the rotatable member; and a corrector configured to perform the correction with reference to a reference position that is one rotational position of the rotatable member in an origin state where a driven member driven by the motor is located at its origin position, and by using each of the correction values for each change of the detection signal when the rotatable member is rotated from the reference position.