Lens barrel in which motor capable of selecting stepping drive or brushless drive is provided
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United States of America Patent
Stats
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Jan 27, 1987
Grant Date -
N/A
app pub date -
Dec 26, 1984
filing date -
Jan 10, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A lens barrel provided therein with a hollow cylindrical permanent magnet having a permanent magnet portion for stepping drive and a magnet portion for brushless drive, a step driving coil and a brushless driving coil, and a focusing lens system axially moved by the rotary motion of the cylindrical permanent magnet. In case the amount of movement of the lens system required for bringing it to the focused position exceeds a determined value, the lens system is moved to a position corresponding to the determined value by the rotary motion of the brushless driving permanent magnet portion, and in case the above-mentioned amount is equal to or less than the determined value, the lens system is brought to the focused position by the rotary motion of the step driving permanent magnet portion.
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