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    • 42. 发明授权
    • Focus condition detecting device for use in a camera
    • 用于相机的对焦条件检测装置
    • US4862273A
    • 1989-08-29
    • US251770
    • 1988-09-30
    • Tokuji IshidaToshio Norita
    • Tokuji IshidaToshio Norita
    • G02B7/34
    • G02B7/34
    • A focus detecting device for a camera is disclosed which employs a CCD for producing an image signal carrying focus information. A monitoring circuit has a charge storing circuit for storing the charge generated from a light receiving element, so that the monitoring circuit monitors the amount of light received from the target object to be photographed and produces a charge signal representing the monitored amount. A reference signal generator is provided for producng a reference signal. Since the reference signal generator is defined by the same circuitry as the charge storing circuit, undesirable fluctuation in the charge signal will also be seen in the reference signal. Since undesirable fluctuation in both signals can be counterbalanced with each other, the comparison between the charge signal and the reference signal can be done with high accuracy.
    • 公开了一种用于摄像机的焦点检测装置,其采用CCD来产生携带聚焦信息的图像信号。 监视电路具有用于存储从光接收元件产生的电荷的电荷存储电路,使得监视电路监视从被拍摄对象物体接收的光量,并产生表示监视量的电荷信号。 提供用于产生参考信号的参考信号发生器。 由于参考信号发生器由与电荷存储电路相同的电路定义,所以在参考信号中也将看到充电信号的不期望的波动。 由于两个信号的不希望的波动可以相互平衡,因此可以高精度地进行充电信号与参考信号之间的比较。
    • 43. 发明授权
    • Focus detecting optical system including two prisms for light refraction
    • 聚焦检测光学系统包括两个棱镜用于光折射
    • US4808808A
    • 1989-02-28
    • US5088
    • 1987-01-20
    • Toshihiko KarasakiTokuji IshidaMasataka HamadaToshio NoritaNobuyuki Taniguchi
    • Toshihiko KarasakiTokuji IshidaMasataka HamadaToshio NoritaNobuyuki Taniguchi
    • G03B13/36G02B7/34G01J1/20
    • G02B7/343
    • A focus detecting optical system including a condenser lens disposed in a vicinity of or rearwardly of a predetermined focal plane of a photographic lens, an image forming lens unit having a pair of image forming lens sections disposed symmetrically relative to a main optical axis, a light blocking member having an opening for regulating a luminous flux coming into the image forming lens unit, a first prism for refracting the luminous flux in a direction departing from the main optical axis, a second prism for refracting the luminous flux in a direction nearing the main optical axis and a light receiving element array. An image formed on the light receiving element array and formed of the luminous flux carried through the condenser lens, the first prism, one of the image forming lens sections and the second prism and an image formed on the light receiving element array and formed of the luminous flux carried through the condenser lens, the first prism, the other image forming lens section and the second prism are placed with a sufficient distance therebetween by working of the first and second prisms. A focus detecting operation is carried out by comparing these images.
    • 一种焦点检测光学系统,包括设置在摄影透镜的预定焦平面附近或之后的聚光透镜,成像透镜单元,具有相对于主光轴对称设置的一对成像透镜部分,光 具有用于调节进入图像形成透镜单元的光束的开口的阻挡构件,用于在离开主光轴的方向折射光通量的第一棱镜,用于沿接近主光线的方向折射光通量的第二棱镜 光轴和光接收元件阵列。 形成在光接收元件阵列上的由形成在聚光透镜,第一棱镜,图像形成透镜部分和第二棱镜中的一个的光束形成的图像和形成在光接收元件阵列上并由 通过聚光透镜携带的光束,第一棱镜,其他成像透镜部分和第二棱镜通过第一和第二棱镜的加工而放置在其间具有足够的距离。 通过比较这些图像来进行焦点检测操作。
    • 44. 发明授权
    • Focus condition detecting device for use in a camera
    • 用于相机的对焦条件检测装置
    • US4783701A
    • 1988-11-08
    • US905686
    • 1986-09-09
    • Tokuji IshidaToshio Norita
    • Tokuji IshidaToshio Norita
    • G02B7/34H04N3/14
    • G02B7/34
    • A focus detecting device for a camera is disclosed which employs a CCD for producing an image signal carrying focus information. A monitoring circuit has a charge storing circuit for storing the charge generated from a light receiving element, so that the monitoring circuit monitors the amount of light received from the target object to be photographed and produces a charge signal representing the monitored amount. A reference signal generator is provided for producing a reference signal. Since the reference signal generator is defined by the same circuitry as the charge storing circuit, undesirable fluctuation in the charge signal will also be seen in the reference signal. Since undesirable fluctuation in both signals can be counterbalanced with each other, the comparison between the charge signal and the reference signal can be done with high accuracy.
    • 公开了一种用于摄像机的焦点检测装置,其采用CCD来产生携带聚焦信息的图像信号。 监视电路具有用于存储从光接收元件产生的电荷的电荷存储电路,使得监视电路监视从被拍摄对象物体接收的光量,并产生表示监视量的电荷信号。 提供用于产生参考信号的参考信号发生器。 由于参考信号发生器由与电荷存储电路相同的电路定义,所以在参考信号中也将看到充电信号的不期望的波动。 由于两个信号的不希望的波动可以相互平衡,因此可以高精度地进行充电信号与参考信号之间的比较。