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    Apparatus for meterless exposure value indication
    2.
    发明授权
    Apparatus for meterless exposure value indication 失效
    无接触值指示的装置

    公开(公告)号：US3698301A

    公开(公告)日：1972-10-17

    申请号：US3698301D

    申请日：1969-07-18

    申请人： PENTACON DRESDEN VEB

    发明人： REIMANN HUBERTUS ,  LINDNER FRITZ

    IPC分类号： G01J1/44 ,  G03B17/20 ,  G01J1/10

    CPC分类号： G01J1/44 ,  G03B17/20

    摘要： An exposure measuring apparatus has a lighting element which can be connected to and influenced by a source of supply potential. Means are provided for presetting the light emission of the lighting element. A photo-sensitive receiver influenced by prevailing light conditions is connectable with the source of supply potential and influences the light emission of a second lighting element which is connected in circuit with the photosensitive receiver and at least one resistance attenuation element. The resistance attenuation element or elements are adapted to adjust the light emission of the second lighting element in accordance with required exposure factors when the supply potential is connected. The lighting elements are formed as light source pillars the color of which are influenced by their supply frequency, e.g. electro luminescent plates. The source of supply potential is an alternating current source and the second lighting element is connected therewith via a variable frequency generator the frequency of which is influenced by the setting of the resistance attenuation elements. The first and second lighting elements are arranged to illuminate respective surfaces positioned immediately adjacent one another whereby when the color and brightness of each of the surfaces is equal, the exposure factors are set to values required for accurate exposure.

    Micro-film camera
    7.
    发明授权
    Micro-film camera 失效
    微型相机

    公开(公告)号：US3704947A

    公开(公告)日：1972-12-05

    申请号：US3704947D

    申请日：1971-01-04

    申请人： PENTACON DRESDEN VEB

    发明人： REIMANN HUBERTUS

    IPC分类号： G03B27/80 ,  G03B27/78

    CPC分类号： G03B27/80

    摘要： A microfilm camera for reproducing documents is provided with a photo receiver mounted on its housing. An optical system mounted on the housing directs light reflected by a punctiform area near the edge of the document to be photographed onto the photo receiver. A wedge prism is rotatably mounted on the housing in the light path between the photo receiver and the document to enable the puntiform portion scanned by the photo-receiver to be varied over the document and its border during a rotation of the wedge prism. Mounted on the housing is a drive means which rotates the wedge at a constant speed. Provision is made for reducing the output from the photo-electric device to a zero illumination level once during each revolution of the wedge prism. Mounted on the housing is a measuring circuit which includes a rectifier connected with an output of the photoreceiver and a storage device having a time constant long compared with the time for one rotation of the wedge prism and effective to store a voltage indicative of the brightness of the document. A control device is influenced by the output of the storage device provides a controlled voltage which influences the illumination of the lamp in dependence on the brightness of the document border.

    摘要翻译： 用于再现文档的微缩胶片相机设置有安装在其外壳上的照相机。 安装在壳体上的光学系统将由要拍摄的文件的边缘附近的点状区域反射的光引导到光接收器上。 楔形棱镜可旋转地安装在光接收器和文件之间的光路中的壳体上，使得在楔形棱镜的旋转期间能够使由光电接收器扫描的蓬形部分在文件及其边界上变化。 安装在壳体上的是以恒定速度旋转楔块的驱动装置。 规定了在楔形棱镜的每次旋转期间将光电装置的输出减少到零照明水平。 安装在壳体上的是测量电路，其包括与光接收器的输出连接的整流器和与楔形棱镜的一次旋转的时间相比具有时间常数长的存储装置，并且有效地存储指示 文件的亮度。 控制装置受到存储装置的输出的影响，根据文件边界的亮度提供影响灯的照明的受控电压。

    Photographic exposure meter arrangement with photoconductive cell
    8.
    发明授权
    Photographic exposure meter arrangement with photoconductive cell 失效
    摄影曝光表与光电池组合

    公开(公告)号：US3615141A

    公开(公告)日：1971-10-26

    申请号：US3615141D

    申请日：1968-09-30

    申请人： PENTACON DRESDEN VEB

    发明人： REIMANN HUBERTUS ,  SCHUTZE SIEGFRIED

    IPC分类号： G03B7/04 ,  G01J1/44

    CPC分类号： G03B7/04

    摘要： EXPOSURE METER ARRANGEMENT WITH PHOTO-CONDUCTIVE CELL AND A BATTERY FEEDING THE LATTER, ALSO A GALVANOMETER THE POINTER ZERO POSITION OF WHICH INDICATES THE BALANCING OF THE MEASURING APPARATUS BROUGHT ABOUT BY RESISTANCE ATTENUATION ELEMENTS, AND THUS THE CORRECT COMBINATION OF THE EXPOSURE FACTORS ACCORDING TO BRIGHTNESS, WHEREIN ON THE ONE HAND THE ENTIRE MEASURING APPARATUS INCLUDING GALVANOMETER IS CONNECTIBLE THROUGH A SWITCH TO THE BATTERY AND IN THAT ON THE OTHER HAND WHEN THE BATTERY IS DISCONNECTED FROM THE ENTIRE MEASURING APPARATUS A PERMANENT CURRENT AT THE LEVEL OF THE SELF-DISCHARGE CURRENT OF THE BATTERY IS FED TO THE GALVANOMETER THROUGH AN AUXILIARY CURRENT PATH WHICH IS OF HIGH OHMIC VALUE IN COMPARISON WITH EVERY RESISTANCE VALUE OF THE MEASURING APPARATUS.