Drive device which can be freely attached to/detached from lens barrel, and process control method and adjustment method for same
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United States of America Patent
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May 24, 2016
Grant Date -
May 21, 2015
app pub date -
Jan 26, 2015
filing date -
Aug 29, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
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.
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