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1. 发明授权

US4831402A Camera with changeable focal length 失效
标题翻译：相机具有可变焦距
公开(公告)号：US4831402A
公开(公告)日：1989-05-16
申请号：US200423
申请日：1988-05-31
申请人： Yoshihiro Fujita , Takao Umetsu , Ysuyoshi Masaoka , Minoru Takahashi
发明人： Yoshihiro Fujita , Takao Umetsu , Ysuyoshi Masaoka , Minoru Takahashi
IPC分类号： G03B17/12 , G03B3/10 , G03B19/07
CPC分类号： G03B19/07 , G03B3/10
摘要： A camera includes a taking lens system changeable in focal length between at least a short focal length suitable for wide-angle photography and a long focal length suitable for telephotography. The lens system is held in a lens barrel which is axially displaced by means of a motor to change the lens system between at least the two different focal lengths. The camera is provided with a controller for sequentially controlling the motor to move the lens barrel in one axial direction so as to change the lens system to have one of the different focal lengths selected by a focal length selecting switch, to move the lens barrel in the opposite axial direction when the lens barrel does not reach a position wherein the taking lens system has the selected focal length in a predetermined time period, and to stop when the lens barrel reaches the position wherein the taking lens system has another one of the different focal lengths. For detecting the lens barrel at the axial position where the taking lens system has the different focal lengths, the camera is provided with a detector for detecting an unusual motion of the lens barrel in cooperation with the controller.
摘要翻译：相机包括可在适合于广角摄影的至少短焦距和适合于长焦摄影的长焦距之间的焦距可变的拍摄镜头系统。透镜系统保持在透镜筒中，透镜筒通过电机轴向移位，以在至少两个不同焦距之间改变透镜系统。相机设置有控制器，用于顺序地控制电动机沿一个轴向移动透镜镜筒，以便将透镜系统改变为具有由焦距选择开关选择的不同焦距之一，以将透镜镜筒移动到当镜筒没有到达其中拍摄镜头系统在预定时间段内具有选定焦距的位置时相反的轴向方向，并且当镜筒到达其中拍摄镜头系统具有另一个不同的位置时焦距为了在拍摄镜头系统具有不同焦距的轴向位置处检测镜筒，相机配备有用于与控制器协作检测镜筒的异常运动的检测器。

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