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    Warning circuit for use in a ttl-type electronic shutter
    46.
    发明授权
    Warning circuit for use in a ttl-type electronic shutter 失效
    用于TTL型电子快门的警告电路

    公开(公告)号：US3648053A

    公开(公告)日：1972-03-07

    申请号：US3648053D

    申请日：1970-11-06

    Applicant: COPAL CO LTD

    Inventor： SATO TAKAYOSHI

    IPC: G03B7/083 ,  G01J1/00 ,  G01J1/52

    CPC classification number: G03B7/083

    Abstract: Warning circuit for use in a TTL-type electronic shutter having an integrating circuit, a memory circuit, an exposure control circuit and a switching circuit for actuating shutter blades for the proper exposure in accordance with the intensity of light received by a photoelectric element of the integrating circuit adapted to receive the light from the object through the objective of a camera. The memory circuit provides a reference voltage in accordance with the reference time set in the integrating circuit in response to the intensity of light. The warning circuit comprises a series circuit of a resistor and a capacitor and a transistor connected to the series circuit and adapted to energize pilot means when triggered. The series circuit is connected to the memory circuit so as to be actuated during the reference time while the transistor is triggered when the voltage of the capacitor reaches the triggering voltage of the transistor. The emitter bias of the transistor is set to either of the upper limit or the lower limit of the shutter speed, so that the improper condition of the scene brightness for the proper exposure is detected by inspecting whether or not the pilot means is energized.

    Abstract translation: 用于具有积分电路的TTL型电子快门的警告电路，存储器电路，曝光控制电路和用于根据由光电元件的光电元件接收的光的强度致动快门叶片的切换电路 集成电路，其适于通过相机的目的从物体接收光。 存储电路响应于光的强度，根据在积分电路中设定的参考时间提供参考电压。 警告电路包括电阻器和电容器的串联电路和连接到串联电路的晶体管，并且适于在被触发时激励导频装置。 串联电路连接到存储器电路，以便在参考时间内被激活，同时当电容器的电压达到晶体管的触发电压时触发晶体管。 晶体管的发射极偏置被设定为快门速度的上限或下限，从而通过检查导频装置是否通电来检测正确曝光的场景亮度的不正确状况。

    Camera structure for preventing improper automatic exposures
    47.
    发明授权
    Camera structure for preventing improper automatic exposures 失效
    用于防止不自然曝光的相机结构

    公开(公告)号：US3643572A

    公开(公告)日：1972-02-22

    申请号：US3643572D

    申请日：1970-10-30

    Applicant: ASAHI OPTICAL CO LTD

    Inventor： KUREI HIROSHI

    IPC: G03B7/00 ,  G03B19/12 ,  G01J1/00 ,  G01J1/52

    CPC classification number: G03B19/12 ,  G03B7/006

    Abstract: A single-lens reflex camera of the type which provides automatic exposure determination with light received through the objective. A mirror or reflector has a viewing position in the path of light received through the objective and permitting proper automatic exposure determination. This reflector also has an exposure position situated beyond the latter path of light and preventing proper automatic exposure determination. For special photography purposes, a manually operable positioning structure coacts with the reflector to maintain it in its exposure position. A manually operable selecting structure is provided for selecting either automatic exposure determination or one of a plurality of exposure-determining factors. A shutter release is available to be manually actuated for tripping the shutter. A blocking structure coacts with the shutter release as well as with the positioning structure and selecting structure to block the shutter release automatically in response to location of the positioning structure in its position maintaining the reflector in its exposure position and to location of the selecting structure in the position providing for automatic exposure determination.

    Abstract translation: 一种单镜头反光相机，可通过物镜接收的光线进行自动曝光确定。 反射镜或反射镜在通过物镜接收的光的路径中具有观察位置，并允许适当的自动曝光确定。 该反射器还具有位于后面的光路之外的曝光位置，并且防止适当的自动曝光确定。 对于特殊摄影目的，可手动操作的定位结构与反射器共同作用以将其保持在其曝光位置。 提供手动操作的选择结构用于选择自动曝光确定或多个曝光确定因素中的一个。 快门释放可手动启动以使快门跳闸。 阻挡结构与快门释放以及定位结构和选择结构共同作用以自动阻挡快门释放，以响应于定位结构在其将反射器保持在其曝光位置的位置以及选择结构的位置 提供自动曝光确定的位置。

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