Drive control apparatus, and lens apparatus and image pickup system including the drive control apparatus

A lens apparatus comprising:

• a movable optical member;
• a drive control apparatus, the drive control apparatus comprising:
• a motor;
• a transmission device including a gear and configured to transmit a driving force of the motor to the movable optical member;
• a first detector provided on a side of the movable optical member with respect to the transmission device and configured to detect a driving state of the movable optical member;
• a second detector provided on a side of the motor with respect to the transmission device and configured to detect a driving state of the movable optical member;
• and
• a controller configured to control the motor,
• wherein the controller is configured to
• control the motor based on a first detection result obtained by the first detector in a case where a difference between the first detection result and a second detection result obtained by the second detector does not exceed a given value, and control the motor based on the second detection result in a case where the difference exceeds the given value.

An image pickup system comprising:

• a lens apparatus;
• and
• an image pickup element configured to pick up an image formed by the lens apparatus,
• wherein the lens apparatus comprising a drive control apparatus,
• the drive control apparatus comprising:
• a movable optical member;
• a drive control apparatus, the drive control apparatus comprising:
• a motor;
• a transmission device including a gear and configured to transmit a driving force of the motor to the movable optical member;
• a first detector provided on a side of the movable optical member with respect to the transmission device and configured to detect a driving state of the movable optical member;
• a second detector provided on a side of the motor with respect to the transmission device and configured to detect a driving state of the movable optical member;
• and
• a controller configured to control the motor,
• wherein the controller is configured to
• control the motor based on a first detection result obtained by the first detector in a case where a difference between the first detection result and a second detection result obtained by the second detector does not exceed a given value, and control the motor based on the second detection result in a case where the difference exceeds the given value.