公开(公告)号：US4000498A

公开(公告)日：1976-12-28

申请号：US567116

申请日：1975-04-11

申请人： Tokuichi Tunekawa ,  Takehiko Kiyohara ,  Masanori Uchidoi ,  Tetsuya Taguchi ,  Yukio Mashimo ,  Yusuke Ono

发明人： Tokuichi Tunekawa ,  Takehiko Kiyohara ,  Masanori Uchidoi ,  Tetsuya Taguchi ,  Yukio Mashimo ,  Yusuke Ono

IPC分类号： G03B7/083 ,  G03B7/08

CPC分类号： G03B7/083

摘要： An exposure control apparatus which can set accurate shutter speed constantly irrespective of changes in ambient temperature and which can eliminate not only an error in shutter speed caused by an expansion semiconductor element but also an error in shutter speed caused by the variation in output characteristics due to variation in temperature of a compression circuit.

摘要翻译： 一种曝光控制装置，其能够随着环境温度的变化而恒定地设定精确的快门速度，并且不仅可以消除由扩展半导体元件引起的快门速度的误差，而且可以消除由于由于扩展半导体元件引起的输出特性的变化而引起的快门速度的误差 压缩电路的温度变化。

公开(公告)号：US4032933A

公开(公告)日：1977-06-28

申请号：US554901

申请日：1975-03-03

申请人： Tadashi Ito ,  Masanori Uchidoi ,  Tetsuya Taguchi ,  Tokuichi Tunekawa ,  Hiroshi Aizawa ,  Yoshiyuki Takishima

发明人： Tadashi Ito ,  Masanori Uchidoi ,  Tetsuya Taguchi ,  Tokuichi Tunekawa ,  Hiroshi Aizawa ,  Yoshiyuki Takishima

IPC分类号： G03B17/20

CPC分类号： G03B17/20

摘要： A camera having an indication system to determine suitable diaphragm aperture value by measuring the light penetrating through a photographing lens and to indicate the same digitally, wherein when said diaphragm aperture value exceeds the limit value of exposure control of a camera, a warning indication is given by the indication means to indicate the fact that the diaphragm aperture value is outside of control limit, and the number of input/output lead wires to the indication means is reduced. Thus simplifying the set-up.

公开(公告)号：US4124855A

公开(公告)日：1978-11-07

申请号：US807653

申请日：1977-06-17

申请人： Masanori Uchidoi ,  Hideaki Miyakawa ,  Hiroshi Aizawa ,  Masayoshi Yamamichi ,  Osamu Ohshima ,  Tokuichi Tunekawa

发明人： Masanori Uchidoi ,  Hideaki Miyakawa ,  Hiroshi Aizawa ,  Masayoshi Yamamichi ,  Osamu Ohshima ,  Tokuichi Tunekawa

IPC分类号： G03B7/085 ,  G03B7/08

CPC分类号： G03B7/085

摘要： An automatic exposure control apparatus of electric type for a photographic camera having an exposure control parameter setting means cooperative with a geometrical progression scale in isometric graduation is provided with a resistor device. The device includes a variable resistor having a grounded slider associated with the setting means upon movement thereof for providing a resistor value proportional to the amount of movement of the setting means, but to the reciprocal logarithm of the preselected parameter value. In order to minimize the complexity of a computer circuit responsive to the various outputs of the resistor device for performing photographic Appex computation, a bias voltage is applied to each of the variable resistors in a manner to produce a signal in the form of current proportional to the reciprocal of the amount of movement of the setting means. The resistor device has a single substrate having a plurality of resistor elements formed thereon by a metal coating technique and arranged for cooperation with respective sliders, thereby improving the exposure control accuracy and stabilization of the performance of the computer circuit against variation of temperature distribution in the apparatus.

摘要翻译： 具有电阻器装置的具有具有与等距离刻度上的几何级数相配合的曝光控制参数设定装置的照相机电式的自动曝光控制装置。 该装置包括可变电阻器，其具有与设置装置相关联的接地滑块，用于提供与设置装置的移动量成比例的电阻器值，而与预设参数值的倒数对数相对应。 为了最小化响应于用于执行照相Appex计算的电阻器装置的各种输出的计算机电路的复杂性，将偏压施加到每个可变电阻器，以产生与电流成比例的电流形式的信号 设定装置的移动量的倒数。 电阻器件具有通过金属涂覆技术形成在其上的多个电阻器元件的单个基板，并被布置为与各个滑块配合，从而提高了曝光控制精度，并且稳定了计算机电路的性能以防止温度分布的变化 仪器。

公开(公告)号：US4134652A

公开(公告)日：1979-01-16

申请号：US760960

申请日：1977-01-21

申请人： Takehiko Kiyohara ,  Youichi Okuno ,  Tokuichi Tunekawa ,  Teiji Hashimoto

发明人： Takehiko Kiyohara ,  Youichi Okuno ,  Tokuichi Tunekawa ,  Teiji Hashimoto

IPC分类号： G03B7/099 ,  G03B7/08

CPC分类号： G03B7/09976

摘要： In a finder optic system having the structure in which a tiltable mirror, in its reflecting position, reflects light entering through the camera objective upward onto a focusing screen where an image of the object to be photographed is formed and light from the image is radiated upward through the condenser lens and a pentaprism into an eyepiece, a light meter arrangement in accordance with an embodiment of the invention comprises a single photo-cell and a glass plate provided with an angular surface formed therein for acceptance of the photo-cell. The glass plate is cemented at one of the surfaces parallel to the exit surface of the pentaprism in front of the eyepiece and is oriented so that the angular surface is rearwardly inclined with respect to the axis of the finder optic, whereby a light beam from one of two different portions outside the central portion of the image is directed through the pentaprism with regular reflections therein to the angular surface to reach the photo-cell and a light beam from the other is directed through the pentaprism without any regular reflection to the angular surface to reach the same photo-cell. The arrangement permits the photo-cell to produce a light value which is, in effect, substantially equal to that sensed by a photo-cell positioned to receive a light beam from the central portion of the image.

摘要翻译： 在具有这样的结构的取景器光学系统中，其中在其反射位置的可倾斜反射镜将通过相机物镜进入的光向上反射到聚焦屏幕上，其中形成要被拍摄的物体的图像，并且来自图像的光被向上辐射 通过聚光透镜和五棱镜进入目镜，根据本发明的实施例的光计装置包括单个光电池和设置有用于接受光电池的角度表面的玻璃板。 玻璃板在与目镜前方平行于五棱镜的出射表面的一个表面上胶合并且被定向成使得角表面相对于取景器光学器件的轴向后倾斜，由此来自一个 在图像中心部分之外的两个不同部分被引导通过其中具有规则反射的五棱镜到达角表面以到达光电池，并且来自另一个的光束被引导通过五棱镜而没有任何规则反射到角度表面 到达同一个光电池。 该装置允许光电池产生实际上基本上等于被定位成接收来自图像的中心部分的光束的光电池感测的光值。

公开(公告)号：US4037234A

公开(公告)日：1977-07-19

申请号：US645356

申请日：1975-12-30

申请人： Tokuichi Tunekawa ,  Soichi Nakamoto ,  Tetsuya Taguchi

发明人： Tokuichi Tunekawa ,  Soichi Nakamoto ,  Tetsuya Taguchi

IPC分类号： G03B7/085 ,  G03B7/16 ,  G03B7/08

CPC分类号： G03B7/16 ,  G03B7/085

摘要： An exposure control system for a camera capable of deriving more reliable and accurate exposure values over an extended range of scene luminance despite variation of the ambient temperature of the system than was previously possible. The exposure control system is characterized by the use of a photovoltaic cell and a logarithmic converter connected thereto in combination with a voltage stabilizer for providing output current signals of which the values are independent of temperature to the automatic camera diaphragm aperture regulating mechanism. The logarithmic converter consists of an operational amplifier with a feedback diode connected between the input and the output of the operational amplifier. The voltage stabilizer connected to the operational amplifier comprises a plurality of transistors selected to have such characteristics that the temperature dependance components of the luminance versus output signal response characteristic of the photovoltaic cell and the logarithmic conversion of the converter are cancelled by the temperature dependence component of the voltage supplied from the voltage stabilizer.

摘要翻译： 一种用于相机的曝光控制系统，其能够在场景亮度的扩展范围内获得更可靠和准确的曝光值，尽管系统的环境温度变化比先前可能的变化。 曝光控制系统的特征在于使用光伏电池和连接到其上的对数转换器以及稳压器，用于提供与自动相机光圈孔调节机构的温度无关的输出电流信号。 对数转换器由运算放大器组成，反相二极管连接在运算放大器的输入和输出端之间。 连接到运算放大器的稳压器包括被选择为具有这样的特性的多个晶体管，使得光伏电池的亮度对输出信号响应特性的温度依赖性分量和转换器的对数转换由温度依赖性分量 从稳压器提供的电压。