Position detecting apparatus, and lens apparatus and image pickup apparatus including the position detecting apparatus

A lens apparatus, comprising:

• a movable optical member;
• and
• a position detecting apparatus serving as a position detecting apparatus for the movable optical member, the position detecting apparatus, comprising:
• a scale comprising a plurality of pattern arrays formed in different cycles in a movement direction;
• an obtaining unit configured to obtain a plurality of signals in accordance with the plurality of pattern arrays;
• a first deriving unit configured to derive a temporal position of the scale with respect to the obtaining, based on the plurality of signals;
• a second deriving unit configured to derive a displacement amount of the scale with respect to the obtaining unit based on one or more signals of the plurality of signals;
• and
• a determinator configured to determine a determined position of the scale with respect to the obtaining unit based on the temporal position and the displacement amount,
• wherein the determinator determines the determined position based on a result of comparison between a difference between a first temporal position calculated by the first deriving unit at a first position and a second temporal position calculated by the first deriving unit at a second position and a displacement amount derived by the second deriving unit from the first position to the second position.

An image pickup apparatus, comprising:

• a lens apparatus comprising;
• a movable optical member;
• and
• a position detecting apparatus serving as a position detecting apparatus for the movable optical member, the position detecting apparatus, comprising:
• a scale comprising a plurality of pattern arrays formed in different cycles in a movement direction;
• an obtaining unit configured to obtain a plurality of signals in accordance with the plurality of pattern arrays;
• a first deriving unit configured to derive a temporal position of the scale with respect to the obtaining unit, based on the plurality of signals;
• a second deriving unit configured to derive a displacement amount of the scale with respect to the obtaining unit based on one or more signals of the plurality of signals;
• and
• a determinator configured to determine a determined position of the scale with respect to the obtaining unit based on the temporal position and the displacement amount,
• wherein the determinator determines the determined position based on a result of comparison between a difference between a first temporal position calculated by the first deriving unit at a first position and a second temporal position calculated by the first deriving unit at a second position and a displacement amount derived by the second deriving unit from the first position to the second position;
• and
• a camera apparatus.