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公开(公告)号：US4381523A
公开(公告)日：1983-04-26
申请号：US224464
申请日：1981-01-12
CPC分类号： H04N5/23212
摘要： An automatic focusing device comprises a detector for detecting distributions of the images of an object which are formed by two light beams passing through two different points in a photographing optical system and for providing corresponding video signals. The video signals are processed to obtain an output signal representative of a relative positional relation between the video signals for use in establishing the optical system moving direction and the distance of movement of the focusing position, or to determine only the direction of movement of the optical system so that the optical system is moved in the direction thus determined to the focusing position. The automatic focusing operation can be accomplished without using movable members other than the photographing lens of the optical system, or in the case of using a movable member, the focusing operation can be achieved with high accuracy by operating the movable member only once.
摘要翻译： 自动对焦装置包括检测器，用于检测通过拍摄光学系统中的两个不同点的两个光束形成的对象的图像分布并提供对应的视频信号。 处理视频信号以获得表示用于建立光学系统移动方向和聚焦位置的移动距离的视频信号之间的相对位置关系的输出信号，或仅确定光学器件的移动方向 系统，使得光学系统沿着这样确定的方向移动到聚焦位置。 可以在不使用除了光学系统的拍摄镜头之外的可动构件的情况下实现自动聚焦操作，或者在使用可移动部件的情况下，可以通过仅操作可移动部件一次来实现高精度的聚焦操作。
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公开(公告)号：US4423935A
公开(公告)日：1984-01-03
申请号：US460282
申请日：1983-01-24
申请人： Mitsuo Eguchi , Yoshimi Kikuchi , Nobuyuki Ichino
发明人： Mitsuo Eguchi , Yoshimi Kikuchi , Nobuyuki Ichino
CPC分类号： G02B7/34
摘要： An automatic focusing device having a signal processing circuit for providing a focusing signal and a defocusing signal, or drive direction signal, to move the photographing lens to a focusing position the device is provided with a hunting preventing circuit in which, even if the drive direction signal is developed after it has been determined that the lens is focused on the object, the drive direction signal is made ineffective for a period of time which is shorter when the object brightness is high and longer where the brightness is low, whereby the hunting phenomenon with the lens which is liable to occur with a low brightness is positively prevented.
摘要翻译： 一种自动对焦装置，具有用于提供聚焦信号和散焦信号或驱动方向信号的信号处理电路，以将拍摄镜头移动到聚焦位置，该装置设置有防抖电路，其中，即使驱动方向 在确定透镜被聚焦在物体上之后，信号被显影，当亮度低的场景亮度高的时间较短时，驱动方向信号变得无效，由此产生拍摄现象 可靠地防止易于以低亮度发生的透镜。
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公开(公告)号：US4460261A
公开(公告)日：1984-07-17
申请号：US466306
申请日：1983-02-14
申请人： Mitsuo Eguchi , Yoshimi Kikuchi , Nobuyuki Ichino
发明人： Mitsuo Eguchi , Yoshimi Kikuchi , Nobuyuki Ichino
摘要： An automatic focusing device by which the intensity distribution of an image of an object to be photographed is detected by a detecting section having an accumulation mode image sensor with a charge accumulation time in dependence upon the brightness of the object and develop a video signal corresponding to the intensity distribution. A signal processing circuit processes the video signal to determine whether the optical system of the photographing apparatus with which the focusing device is associated is focused or out of focus and when an out-of-focus condition is detected a drive direction signal is developed and applied to a drive to move the lens in a proper direction toward a focusing position. The drive direction signal is applied to the drive for only a predetermined time at each detection that the optical system is out of focus when the brightness of the object is low and when the brightness of the object is high the drive direction signal is applied without interruption until detection that the optical system is in focus irrespective of the charge accumulation time of the image sensor varying in response to the brightness of the object being photographed.
摘要翻译： 一种自动聚焦装置，通过该自动对焦装置，通过具有根据对象的亮度的具有电荷累积时间的累积模式图像传感器的检测部分来检测被拍摄对象的图像的强度分布，并且产生对应于 强度分布。 信号处理电路对视频信号进行处理以确定聚焦装置所关联的拍摄装置的光学系统是聚焦还是聚焦，并且当检测到失焦条件时，显影和应用驱动方向信号 以将透镜朝向聚焦位置的适当方向移动的驱动器。 在物体的亮度低的情况下，在每次检测时驱动方向信号仅在预定时间内被施加到光学系统失焦，并且当物体的亮度高时，不间断地施加驱动方向信号 直到检测到光学系统聚焦，而不管响应于被拍摄物体的亮度而变化的图像传感器的电荷累积时间如何。
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公开(公告)号：US4382665A
公开(公告)日：1983-05-10
申请号：US267447
申请日：1981-05-27
申请人： Mitsuo Eguchi , Yoshimi Kikuchi , Nobuyuki Ichino
发明人： Mitsuo Eguchi , Yoshimi Kikuchi , Nobuyuki Ichino
CPC分类号： G02B7/36
摘要： An automatic focusing device in which the intensity distributions of the images of an object which are formed by light beams passing through different portions of an optical system in a photographing device are detected as video signals. A correlation output is obtained from the video signals so that the focusing condition is detected from the peak position of the correlation output. When the peak position is not one for focalization, a drive direction signal is delivered to drive the optical system towards the focusing position. A low contrast detecting circuit is provided in which is counted how many times the correlation output becomes higher than a predetermined level in one focusing condition detecting operation, and when the count value reaches a predetermined value, the drive direction signal is made ineffected, so as to prevent the occurrence of a hunting phenomenon with the optical system.
摘要翻译： 一种自动聚焦装置，其中通过光照射装置中的光学系统的不同部分的光束形成的物体的图像的强度分布被检测为视频信号。 从视频信号获得相关输出，使得从相关输出的峰值位置检测聚焦条件。 当峰值位置不是用于聚焦的位置时，传送驱动方向信号以驱动光学系统朝向聚焦位置。 提供一种低对比度检测电路，其中在一次聚焦状态检测操作中将相关输出变得高于预定电平多少次，并且当计数值达到预定值时，使驱动方向信号受到影响，因此 以防止光学系统发生振荡现象。
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