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    • 2. 发明授权
    • Photometric circuit for camera
    • 相机光度计
    • US4247186A
    • 1981-01-27
    • US50124
    • 1979-06-19
    • Masanori UchidoiHiroshi AizawaKazunobu UrushibaraNobuyuki SuzukiMasami Shimizu
    • Masanori UchidoiHiroshi AizawaKazunobu UrushibaraNobuyuki SuzukiMasami Shimizu
    • G03B7/081G01J1/44G03B7/083
    • G01J1/44G03B7/08
    • A photometric circuit for a camera including a first operational amplifier with a photo-electric element connected between its inverted and non-inverted input terminals and, a logarithmic compression diode connected between the output terminal and the inverted input terminal of the first operational amplifier, thus providing a voltage corresponding to the logarithmic value of the brightness of an object to be photographed at the output terminal of the first operational amplifier.A second operational amplifier has a plurality of temperature compensating commonly polarized diodes connected in parallel between its inverted input terminal and the output terminal. A first constant voltage is applied to the non-inverted input terminal of the second operational amplifier while a second constant voltage is applied through a resistor to the inverted input terminal of the second operatonal amplifier, thereby providing temperature-compensation of the output voltage of said first operational amplifier.
    • 一种用于照相机的测光电路,包括连接在其反相和非反相输入端子之间的光电元件的第一运算放大器和连接在第一运算放大器的输出端和反相输入端之间的对数压电二极管,因此 提供与在第一运算放大器的输出端子处拍摄的物体的亮度的对数值相对应的电压。第二运算放大器具有多个温度补偿共极化二极管,并联连接在其反相输入端和 输出端子。 第一恒定电压施加到第二运算放大器的非反相输入端,而第二恒定电压通过电阻施加到第二操作放大器的反相输入端,从而提供所述第二运算放大器的输出电压的温度补偿 第一运算放大器。
    • 3. 发明授权
    • Power supply device for camera
    • 相机电源装置
    • US4387977A
    • 1983-06-14
    • US85230
    • 1979-10-16
    • Masanori UchidoiHiroshi AizawaKazunobu UrushiharaNobuyuki SuzukiMasami Shimizu
    • Masanori UchidoiHiroshi AizawaKazunobu UrushiharaNobuyuki SuzukiMasami Shimizu
    • G03B7/26G03B9/08
    • G03B7/26
    • The disclosed camera power control devices operate with a camera in which a first switch responds to initial movement of a shutter release member, and a second switch responds to further movement of the release member. In the power control device, turning the first switch on energizes the light metering and display circuits, and turning on the second switch supplies an exposure control circuit such as a shutter control circuit with electrical energy. The power control device is provided with an electrical timer circuit, and a selection arrangement operates to selectively actuate the timer circuit when the release member is returned to its rest position and the first switch changes is state from ON to OFF. During a period of time determined by the timer circuit, power continues to be supplied to operate the light metering and display circuits.
    • 所公开的照相机功率控制装置与其中第一开关响应快门释放构件的初始移动的照相机一起操作,并且第二开关响应于释放构件的进一步移动。 在功率控制装置中,转动第一开关使得计量和显示电路通电,并且打开第二开关为电能提供诸如快门控制电路的曝光控制电路。 功率控制装置设置有电定时器电路,并且当释放构件返回到其静止位置并且第一开关从接通变为断开状态时,选择装置用于选择性地启动定时器电路。 在由定时器电路确定的时间段期间,继续供电以操作测光和显示电路。
    • 4. 发明授权
    • Shutter time control circuit
    • 快门时间控制电路
    • US4462673A
    • 1984-07-31
    • US401701
    • 1982-07-26
    • Masanori UchidoiNobuyuki Suzuki
    • Masanori UchidoiNobuyuki Suzuki
    • G03B7/093
    • G03B7/093
    • The disclosed shutter control circuit presents a shutter time as an analog value and converts the same into a digital value by an A/D converter, then nullifies information below a prescribed step of shutter time out of thus digitally converted value for effecting shutter time control based on a digital value which is above said prescribed step. In such a type of shutter time control circuit, even when an analog value as a preset value contains a certain error, the shutter time control can be done with said error being corrected and thus it is very convenient. In this case, however, an error in a positive direction only can be corrected, and an error in a negative direction can not be corrected. The present invention has been completed in view of the above and is to provide a shutter time control circuit which can correct the above mentioned analog value or A/D converted digital value by a prescribed amount so that errors in both the positive direction and the negative direction can be corrected in the above mentioned type of shutter time control circuit.
    • 所公开的快门控制电路提供快门时间作为模拟值,并通过A / D转换器将其转换为数字值,然后使由于数字转换的值的规定的快门时间步长以下的信息无效,以进行快门时间控制 在高于所述规定步骤的数字值上。 在这种类型的快门时间控制电路中,即使作为预设值的模拟值包含特定误差,也可以在校正所述误差的情况下进行快门时间控制,因此非常方便。 然而,在这种情况下,仅能够校正正方向的误差,不能校正负方向的误差。 鉴于上述问题,本发明是完成的,其目的是提供一种快门时间控制电路,其能够将上述模拟值或A / D转换数字值校正规定量,使正方向和负方向的误差 可以在上述类型的快门时间控制电路中校正方向。