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    • 74. 发明授权
    • Compact focus detecting device suitable for incorporation into an
optical apparatus
    • 紧凑的聚焦检测装置适用于结合到光学装置中
    • US5262819A
    • 1993-11-16
    • US824873
    • 1992-01-22
    • Keiji OhtakaTakeshi KoyamaYasuo Suda
    • Keiji OhtakaTakeshi KoyamaYasuo Suda
    • G02B7/34G03B13/00
    • G02B7/346
    • A compact focus detecting device featuring increased optical paths includes a first detecting system having first light intensity distribution forming structure for forming a light beam passing through the objective lens a light intensity distribution of which varies in relative position according to the focus state of the objective lens. A first light receiving sensor receives the first light intensity distribution and outputs a first signal indicative of the focused state of the objective lens. The first detecting system has a first detection field and a first optical path. A second detecting system has a second detecting field with a center spaced apart from the center of the first detection field, and a second optical path. The second detecting system includes second light intensity distribution forming structure for forming from the light beam passing through the objective lens a light intensity distribution which varies in relative position according to the focused state of the objective lens. A second light receiving sensor receives the second light intensity distribution and outputs a second signal indicative of the focus state of the objective lens. A light transmitting optical member is provided for adjusting the length of the first and second optical paths. Preferably, the optical member comprises a block having an internal reflecting surface.
    • 具有增加的光路的小型聚焦检测装置包括具有第一光强分布形成结构的第一检测系统,用于形成通过物镜的光束,其光强分布根据物镜的聚焦状态在相对位置上变化 。 第一光接收传感器接收第一光强分布并输出表示物镜的聚焦状态的第一信号。 第一检测系统具有第一检测场和第一光路。 第二检测系统具有第二检测场,其具有与第一检测场的中心间隔开的中心和第二光路。 第二检测系统包括第二光强分布形成结构,用于从通过物镜的光束形成根据物镜的聚焦状态在相对位置上变化的光强度分布。 第二光接收传感器接收第二光强度分布并输出表示物镜聚焦状态的第二信号。 光传输光学构件被设置用于调节第一和第二光路的长度。 优选地,光学构件包括具有内部反射表面的块。
    • 77. 发明授权
    • Focus detecting device and method of making same
    • 焦点检测装置及其制作方法
    • US4878078A
    • 1989-10-31
    • US190171
    • 1988-05-04
    • Takeshi KoyamaKeiji OhtakaYasuo Suda
    • Takeshi KoyamaKeiji OhtakaYasuo Suda
    • G02B7/34
    • G02B7/346
    • In a focus detecting device having a secondary image unit disposed rearwardly of the predetermined imaging plane of an objective lens, a plurality of pairs of object images based on light fluxes passing through different portions of the pupil of the objective lens are formed on a photoelectric conversion element array disposed rearwardly of the secondary imaging unit. The focus of the objective lens is detected from the amount of relative deviation between the object images formed on the photoelectric conversion element array. The secondary imaging unit includes at least two members, a first member having a first pair of lens-acting surfaces and a second pair of lens-acting surfaces on one end thereof, and a second member having a first pair of prism surfaces and a second pair of prism surfaces which differ in refractive power from each other. The second member being fixed to the first member after being rotatively adjusted relative to the first member.
    • 在具有设置在物镜的预定成像平面的后方的二次图像单元的焦点检测装置中,基于通过物镜的光瞳的不同部分的光束的多对物体图像形成在光电转换 元件阵列设置在次级成像单元的后方。 从形成在光电转换元件阵列上的物体图像之间的相对偏离量来检测物镜的焦点。 二次成像单元包括至少两个构件,第一构件,其具有第一对透镜作用表面和在其一个端部上的第二对透镜作用表面,以及具有第一对棱镜表面的第二构件和第二构件 折射力彼此不同的一对棱镜表面。 所述第二构件在相对于所述第一构件旋转调整之后被固定到所述第一构件。