Drive device which can be freely attached to/detached from lens barrel, and process control method and adjustment method for same

摘要

There are provided a drive device that is detachably mounted on a lens barrel making time, which is required until the position of a zoom ring is detected, uniform, a method of controlling initial processing for storing a result of initial processing in a memory, and a method of adjusting an angular position. A series of pulses are output from an encoder 45 according to the rotation of a zoom ring. A reference signal is output from a photo interrupter 40 at an intermediate position of a movable range of the zoom ring. The present position of the zoom ring is calculated from the pulses of the encoder that are generated after the rising or falling of the reference signal. Time, which is required until the position of the zoom ring is detected, is made uniform.

主权项

1. A drive device that is detachably mounted on a lens barrel holding an optical system and includes a ring drive system rotationally driving an operation ring rotatably provided on an outer periphery of the lens barrel, the drive device comprising:
a ring position detecting system that detects the position of the operation ring, wherein the ring position detecting system includes: a rotation transmission mechanism that includes a detection gear provided at a position where the detection gear meshes with a gear of the operation ring when the drive device is mounted on the lens barrel; an encoder that detects the rotation of a rotating shaft included in the rotation transmission mechanism and outputs a series of pulse signals representing the rotation of the operation ring; and a reference signal generator that detects the rotation of the rotating shaft included in the rotation transmission mechanism and adjusts a position of the rotating shaft so that a reference signal is generated at an intermediate position of a movable range of the operation ring.