Patents by Inventor Siegfried Schutze

Siegfried Schutze has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 4190337
    Abstract: The exposure metering circuit comprises a differential amplifier, whose inputs are connected to a measuring bridge consisting of a photo-conductive cell and setting controls for the insertion of exposure factors and whose outputs are connected to light-emitting elements for the indication of a set under-exposure, over-exposure or the correct exposure. The two measuring bridge feed points are connected across a resistor, on the one hand, and across a transistor which is driven by means of a voltage derived from the common emitter circuit of the differential amplifier, on the other hand, to an operating voltage source.
    Type: Grant
    Filed: January 30, 1978
    Date of Patent: February 26, 1980
    Assignee: VEB Pentacon Dresden Kamera- und Kinowerke
    Inventors: Siegfried Schutze, Werner Locke
  • Patent number: 3997904
    Abstract: A circuit arrangement for the pre-indication of the exposure time to be expected in automatic mirror-reflex cameras in which the brightness of a controllable luminous element, which is constant for the duration of the exposure, is used for the illumination of the photo-receiver of the electronic time-formation system. The voltage dropping over the luminous element, which is proportional to the exposure time, is ascertained by means of a measuring mechanism. The luminous element is formed as luminous diode and in parallel therewith there is connected a current path containing the measuring mechanism fed from a constant current source for the compensation of the response voltage of the luminous diode and for the adaptation of the measuring mechanism to the characteristics of the luminous diode.
    Type: Grant
    Filed: May 16, 1975
    Date of Patent: December 14, 1976
    Assignee: VEB Pentacon Dresden
    Inventors: Siegfried Schutze, Werner Locke