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    • 39. 发明授权
    • Piezoelectric flash-ready indicator for photographic camera
    • 用于照相机的压电闪光准备指示器
    • US4290678A
    • 1981-09-22
    • US182896
    • 1980-09-02
    • Michael A. Marcus
    • Michael A. Marcus
    • G03B15/05G03B15/02G03B17/20
    • G03B15/05G03B2215/05
    • A piezoelectric flexure device, mounted on a photographic camera, is used to indicate the "state of readiness" of the camera's electronic flash unit. The flexure device is operatively connected with the flash unit's storage capacitor so that the flexure device is subjected to an electric field proportional to the level of charge on the storage capacitor. Since the shape of a flexure device depends upon the electric field across it, its appearance provides a visual indication to the camera user of the level of charge on the flash capacitor and, hence, the "readiness" of the energizing circuit. Preferably, the flexure device is made of a piezoelectric plastic film, such as PVF.sub.2, which exhibits substantial deformation in the presence of an electric field which can be readily produced by the DC power supply in conventional flash units.
    • 安装在照相机上的压电挠曲装置用于指示相机的电子闪光灯组件的“准备状态”。 挠曲装置与闪光单元的存储电容器可操作地连接,使得挠曲装置经受与存储电容器上的电荷水平成比例的电场。 由于挠曲装置的形状取决于其周围的电场,其外观为照相机用户提供了闪光电容器上的电荷水平的视觉指示,并且因此提供了通电电路的“准备”。 优选地,挠曲装置由诸如PVF2的压电塑料膜制成,其在存在可以容易地由常规闪光单元中的DC电源产生的电场的情况下显示出实质变形。