ApplicationNo. 06/686150 filed on 12/26/1984
US Classes:359/824, Electromagnetic or piezoelectric drive310/112, Plural units, structurally united310/49RStep-by-step
ExaminersPrimary: Punter, William H.
Attorney, Agent or Firm
International ClassG02B 7/08 (20060101)
Foreign Application Priority Data1984-01-10 JP
AbstractA 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.