发明名称 Sonar controlled two focal position lens system
摘要 A photographic camera in which a two-position lens is focused automatically on subjects located within "near" and "far" distance ranges from the camera. The lens is normally positioned in one of the two positions and movable to the other of the two positions in response to a signal generated by an electronic ranging circuit upon the detection of subject location in the focus range to which the other position corresponds.
申请公布号 US4148574(A) 申请公布日期 1979.04.10
申请号 US19770839839 申请日期 1977.10.06
申请人 POLAROID CORPORATION 发明人 JOHNSON, BRUCE K.
分类号 G03B13/36;G02B7/40;G03B19/02;(IPC1-7):G03B3/00 主分类号 G03B13/36
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