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公开(公告)号：US4398813A
公开(公告)日：1983-08-16
申请号：US303016
申请日：1981-09-17
CPC分类号： G03B7/097
摘要： A photographic camera with automatic setting of diaphragm and exposure time. A light sensitive circuit generates pulses and is connected to a diaphragm counting stage for comparing signals from the light sensitive circuit with preset signals in the diaphragm counting stage and for providing a stop pulse to an electromagnetic diaphragm setting stage. A counter is connected to a pulse generator and to the diaphragm counting stage in a stop control connection. A start control provision connects the output of the diaphragm counting stage to an exposure time forming stage. The exposure time forming stage can be connected to the counter for providing automatic setting of the time determining part of the exposure time forming stage depending on the counting state of the counter. A shutter opening member can be connected to the diaphragm counting stage for receiving a control signal for the release part of the shutter opening member.
摘要翻译： 相机具有自动设置光圈和曝光时间。 光敏电路产生脉冲，并且连接到光阑计数台，用于将来自光敏电路的信号与隔膜计数级中的预设信号进行比较，并向电磁隔膜设定阶段提供停止脉冲。 在停止控制连接中，计数器连接到脉冲发生器和隔膜计数级。 开始控制设置将隔膜计数台的输出连接到曝光时间形成阶段。 曝光时间形成阶段可以连接到计数器，以根据计数器的计数状态提供曝光时间形成阶段的时间确定部分的自动设置。 挡板打开构件可以连接到隔膜计数台，用于接收用于挡板打开构件的释放部分的控制信号。
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公开(公告)号：US4192588A
公开(公告)日：1980-03-11
申请号：US835854
申请日：1977-09-20
CPC分类号： G03B7/085
摘要： The output of a bridge circuit which is unbalanced when the quantity of light falling on a light-sensitive element is less than or more than a predetermined light quantity is applied to a differential amplifier circuit whose output varies from a minimum amplitude to a maximum amplitude. The output of the differential amplifier is connected to a first and second threshold circuit whose threshold values are symmetrical to the output value of the differential amplifier when the bridge is in balance. The gain of the differential amplifier is adjusted so that the differential output signal has an amplitude exceeding the first threshold value and less than the second threshold value for variations of light within an allowable range. Within this range the first threshold circuit furnishes an output signal and the second threshold circuit does not. When the first threshold circuit does not furnish an output signal or if the second threshold circuit does, a pulse generator is energized whose pulses are counted by a counter which is controlled to energize the windings of the stepmotor controlling the diaphragm aperture in pairs in a predetermined sequence for opening and the reverse sequence for closing the diaphargm. The operation of the pulse generator and thereby of the motor is impeded when a switch furnishes a signal indicating that the diaphragm is fully open.
摘要翻译： 当落在感光元件上的光量小于或大于预定光量时不平衡的桥式电路的输出被施加到其输出从最小幅度变化到最大幅度的差分放大器电路。 差分放大器的输出端连接到第一和第二阈值电路，当桥接器平衡时，其阈值与差分放大器的输出值对称。 调整差分放大器的增益，使得差分输出信号具有超过允许范围内的光的幅度超过第一阈值且小于第二阈值。 在该范围内，第一阈值电路提供输出信号，第二阈值电路不提供。 当第一阈值电路没有提供输出信号或者第二阈值电路是否被激励时，脉冲发生器被激励，其脉冲被计数器计数，该计数器被控制以激励步进电机的绕组成对地以预定的方式控制隔膜孔 打开的顺序和关闭膈肌的反向顺序。 当开关提供指示隔膜完全打开的信号时，脉冲发生器和电动机的操作受到阻碍。
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公开(公告)号：US4362259A
公开(公告)日：1982-12-07
申请号：US235837
申请日：1981-02-19
CPC分类号： G03B21/52 , G03B27/462
摘要： Apparatus for stepwise transport of exposed and developed photographic films through a copying machine so as to place selected film frames, namely those film frames which are to be imaged onto photographic paper and are designated by holes or other types of indices, into register with the copying station has two photoelectronic detectors the first of which transmits signals to the forward input and the second of which transmits signals to the reverse input of a forward and reverse counter in a circuit which regulates the speed of the film transporting motor. The second detector is located downstream of the first detector and both detectors transmit signals on detection of indices denoting the film frames to be copied. The circuit decelerates the motor, either stepwise or abruptly, in response to detection of indices by the first detector, arrests the motor for a given interval of time in response to detection of indices by the second detector, and ensures that the motor is driven at a maximum speed in the absence of indices between the first and second detectors. The speed of the motor can be increased from zero to maximum speed in a single stage, in several stages, or continuously. This can be accomplished by connecting the operational amplifier for the motor in circuit with a voltage divider wherein one or more resistors are connected in parallel with switching transistors which are energizable with appropriate delays by a timer receiving impulses from the second detector.
摘要翻译： 用于通过复印机逐步传送曝光和显影的照相胶片的装置，以便将所选择的胶片框架，即要被成像到相纸上的胶片框架，以及用空穴或其它类型的索引指定，与复印件对准 站具有两个光电检测器，其中第一个将信号发送到正向输入端，其中第二个检测器在调节膜输送电机的速度的电路中向正向和反向计数器的反向输入端发送信号。 第二检测器位于第一检测器的下游，并且两个检测器在检测到指示要复制的胶片帧的索引时发送信号。 响应于由第一检测器检测到索引而使电动机逐步或突然地减速电动机，响应于由第二检测器检测到的指数而将电动机停止给定的时间间隔，并且确保电动机被驱动 在第一和第二检测器之间没有索引的最大速度。 马达的速度可以在一个阶段中，从零到最大速度，分几个阶段，或连续地增加。 这可以通过将电路中的电动机的运算放大器与分压器连接来实现，其中一个或多个电阻器与开关晶体管并联连接，开关晶体管通过定时器接收来自第二检测器的脉冲的适当延迟而被激励。
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公开(公告)号：US4140379A
公开(公告)日：1979-02-20
申请号：US783468
申请日：1977-03-31
CPC分类号： G03B7/083
摘要： The camera shutter is opened. An electromagnet is energized to keep the shutter open. A first timing circuit includes a photosensitive element exposed to scene light through which a timing capacitor charges. The voltage across the timing capacitor is applied to a threshold circuit which deenergizes the electromagnet when a predetermined capacitor voltage is reached. An auxiliary timing circuit includes an auxiliary capacitor which is charged independently of scene light. An auxiliary threshold circuit produces a control signal when the auxiliary capacitor voltage reaches a predetermined voltage, corresponding to a predetermined time interval. This control signal renders conductive an electronic switch connected across the photosensitive element of the first timing circuit, thereby causing the electromagnet to become deenergized. In this way, if the first timing circuit does not cause the shutter to close within the predetermined time interval, the auxiliary timing circuit does.
摘要翻译： 相机快门打开。 电磁铁通电以保持快门打开。 第一定时电路包括暴露于定时电容器充电的场景光的感光元件。 定时电容器两端的电压被施加到阈值电路，当达到预定的电容器电压时，电路断开电磁铁。 辅助定时电路包括独立于场景光而被充电的辅助电容器。 当辅助电容器电压达到预定电压时，辅助阈值电路产生对应于预定时间间隔的控制信号。 该控制信号使电子开关连接在第一定时电路的感光元件两端，从而使电磁铁断电。 以这种方式，如果第一定时电路在预定时间间隔内没有使快门关闭，则辅助定时电路确实如此。
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