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    • 1. 发明授权
    • Apparatus and method for detecting focus condition of an imaging optical
system
    • 用于检测成像光学系统的焦点状态的装置和方法
    • US4701605A
    • 1987-10-20
    • US828708
    • 1986-02-12
    • Masatoshi Ida
    • Masatoshi Ida
    • G02B7/38G01J1/36
    • G02B7/38
    • An apparatus and method for detecting focus condition of an imaging optical system is disclosed. The apparatus comprises means for dividing a light flux transmitted through the imaging optical system into two sub-light fluxes, first and second light receiving element arrays disposed in front of and at the rear of a predetermined focal plane or a plane conjugated therewith and each having a plurality of light receiving elements, a light flux dividing optical system arranged at the light incident side of the light receiving element arrays for partially cutting incident light and constructed in such a manner that images projected upon respective light receiving element arrays by respective light fluxes transmitted mainly through first and second regions of the imaging optical system, which are divided by a plane including an optical axis of the imaging optical system, are shifted in the array direction in accordance with the amount of defocused condition, means for obtaining first and second evaluation functions representing image sharpness and third and fourth evaluation functions representing image lateral shift by processing outputs of the first and second light receiving element arrays, and means for deciding the defocused condition and the in-focused condition by arithmetically operating all evaluation functions.
    • 公开了一种用于检测成像光学系统的聚焦条件的设备和方法。 该装置包括用于将通过成像光学系统传输的光束分成两个子光束的装置,设置在预定焦平面的前面和后面的第一和第二光接收元件阵列或与之共轭的平面,每个具有 多个光接收元件,光束分配光学系统,其布置在光接收元件阵列的光入射侧,用于部分地切割入射光,并且以这样的方式构造,使得通过相应光束投射到各个光接收元件阵列上的图像被透射 主要通过由包括成像光学系统的光轴的平面划分的成像光学系统的第一和第二区域根据散焦条件的量沿阵列方向移动,用于获得第一和第二评估的装置 表示图像清晰度的函数和第三和第四评估函数r 通过处理第一和第二光接收元件阵列的输出来呈现图像横向偏移,以及用于通过算术地操作所有评估函数来决定散焦状态和聚焦状态的装置。
    • 2. 发明授权
    • Apparatus and method for detecting focus condition of imaging optical
system employing both sharpness detection and lateral shift detection
    • 用于检测锐度检测和横向移位检测的成像光学系统的聚焦条件的装置和方法
    • US4562346A
    • 1985-12-31
    • US494388
    • 1983-05-13
    • Asao HayashiKenichi OinoueMasahiro AokiMasatoshi Ida
    • Asao HayashiKenichi OinoueMasahiro AokiMasatoshi Ida
    • G03B13/36G02B7/34G11B7/09G01J1/20
    • G03B7/0807G03B2217/005
    • In a camera, a focus condition of an objective lens system is automatically detected in accordance with a combination of two different type detection methods. A light flux emanating from the objective lens system is divided into two light fluxes by means of a prism having a half mirror and a reflecting mirror and a first light flux transmitted through the half mirror is received by a first light receiving element array via a lenticular lens array and a second light flux reflected by the half mirror and reflecting mirror successively is directly received by a second light receiving element array. The lenticular lens array is so arranged that an exit pupil of the objective lens and the first light receiving element array are conjugated with each other and thus divided images of the exit pupil are projected upon respective elements of each pair of adjacent light receiving elements. At first, illumination signals supplied from the first image receiving element array are processed to derive a first evaluation value on the basis of an image lateral shift detection to indicate roughly a focal condition of the objective lens system. After the objective lens system has driven near the best focus position, illumination signals supplied from the first and second light receiving element arrays are processed to derive a second evaluation value on the basis of an image sharpness detection to indicate finely the focal condition of the objective lens system.
    • 在相机中,根据两种不同类型的检测方法的组合自动地检测物镜系统的聚焦条件。 从物镜系统发出的光束通过具有半反射镜和反射镜的棱镜被分成两个光束,透过半反射镜的第一光束通过透镜被第一光接收元件阵列接收 由半反射镜和反射镜反射的透镜阵列和第二光束被第二光接收元件阵列直接接收。 双凸透镜阵列被布置成使得物镜的出射光瞳和第一光接收元件阵列彼此共轭,从而将出射光瞳的分割图像投影到每对相邻的光接收元件的相应元件上。 首先,处理从第一图像接收元件阵列提供的照明信号,以基于图像横向偏移检测来导出第一评估值,以大致指示物镜系统的焦点状态。 在物镜系统接近最佳对焦位置之后,从第一和第二光接收元件阵列提供的照明信号被处理以基于图像清晰度检测导出第二评估值,以精确地指出物镜的焦点状况 镜头系统
    • 4. 发明授权
    • Analog-digital converting apparatus
    • 模拟数字转换装置
    • US4503467A
    • 1985-03-05
    • US361436
    • 1982-03-24
    • Masatoshi IdaKenichi OinoueMasahiro AokiAsao Hayashi
    • Masatoshi IdaKenichi OinoueMasahiro AokiAsao Hayashi
    • H03M1/56G02B7/36G02F7/00H03M1/12H03M1/34H04N5/232H04N5/243H04N3/12G06K9/38
    • H03M1/1028H04N5/23212H04N5/243H03M1/123H03M1/56
    • In an analog-digital converting apparatus including a row of light receiving units with each unit having a light receiving element and a sample-hold circuit, a counter for producing a digital signal whose value is increased successively, a digital-analog converter for receiving the digital signal and producing an analog reference signal whose amplitude increases successively from a lower limit value to an upper limit value in step-shaped manner, comparators for comparing the output signals of the light receiving units with said analog reference signal, respectively, memories for receiving the digital signal and controlled by the comparators, respectively to store instantaneous digital values when the corresponding comparators change their states, there is provided a second light receiving unit having substantially the same construction as that of the first mentioned light receiving unit except that a light receiving element provided therein is covered with a light shielding mask so as to produce an output equivalent to a dark current component of the light receiving element, the output of which unit is used as a lower limit voltage source for said digital-analog converter. The apparatus may further include a third light receiving unit having substantially the same as that of the first light receiving unit except that the light receiving element is removed and the input of the sample-hold circuit is connected to a supply voltage so as to produce an output equivalent to a saturation value of the light receiving element, the output of which unit is used as an upper limit voltage source for the digital-analog converter.
    • 在包括具有光接收元件和采样保持电路的每个单元的一行光接收单元的模拟数字转换设备中,用于产生值连续增加的数字信号的计数器,用于接收该数字模拟转换器的数模转换器, 数字信号,并产生其幅度以逐步方式从下限值连续上升到上限值的模拟参考信号,用于将光接收单元的输出信号与所述模拟参考信号分别比较用于接收的存储器 数字信号并由比较器分别控制,以在对应的比较器改变其状态时存储瞬时数字值,提供具有与第一光接收单元基本相同的结构的第二光接收单元,除了光接收 设置在其中的元件被遮光掩模覆盖 以产生相当于光接收元件的暗电流分量的输出,该单元的输出用作所述数模转换器的下限电压源。 除了光接收元件被去除并且采样保持电路的输入连接到电源电压之外,该设备还可以包括具有与第一光接收单元基本相同的第三光接收单元,以便产生 输出相当于光接收元件的饱和值,该单位的输出用作数模转换器的上限电压源。