Patents Assigned to Siegfried Klein
  • Wide pass band elastic wave omnidirectional transducer
    Patent number: 4862430
    Abstract: Wide pass band elastic wave omnidirectional transducer.It comprises a magnetostrictive material membrane (34, 36) provided with two electrical connections at two diametrically opposite points. The potential difference between these connections is proportional to the elastic wave transmitted or received by said membrane. A continuous polarization means of the magnetostrictive membrane is also provided. It comprises a high magnetic permeability part (40, 42), whose shape substantially corresponds to that of the membrane and which is placed in the vicinity of the latter, and a permanent magnet (38) in contact with said part.Application to the transmission of high frequency elastic waves in water (hydrophone) and to high fidelity sound reproduction in air.
    Type: Grant
    Filed: August 4, 1988
    Date of Patent: August 29, 1989
    Assignees: Siegfried Klein, Commissariat a l'Energie Atomique
    Inventor: Siegfried Klein
  • Visual apparatus
    Patent number: 4842400
    Abstract: The visual apparatus makes it possible to limit the instantaneous luminous intensity without reducing the field of vision and comprises a plate with an opaque surface having a transparent slot, a support (2) on which said plate is mounted, said support bearing on part of the body of said person, said plate thus being placed in front of an eye of said person and a scanning means (8) connected to said plate for scanning the opaque surface of said plate by said transparent slot. The apparatus is used more particularly as medical spectacles in the case of cataracts, or as sunglasses.
    Type: Grant
    Filed: July 6, 1988
    Date of Patent: June 27, 1989
    Assignees: Commissariat a L'Energie Atomique, Siegfried Klein
    Inventor: Siegfried Klein
  • Omnidirectional transducer of elastic waves with a wide pass band and production process
    Patent number: 4782471
    Abstract: Omnidirectional, wide pass band, elastic wave transducer comprising a rigid magnetostrictive diaphragm, each surface element of the diaphragm constituting a unidirectional elastic wave transducer in its normal direction, and an electric control means provided with two electric terminals for producing in the vicinity of the diaphragm a homogeneous magnetic field in keeping with an electric signal applied to the terminals of the control means or for supplying an electric signal in keeping with the variation of the magnetic field in the diaphragm as a function of an elastic wave received. The diaphragm is preferably a closed surface of revolution.Application in submarine transmission (hydrophone) and in high fidelity sound reproduction (loudspeaker, microphone) with a very wide pass band.
    Type: Grant
    Filed: August 21, 1985
    Date of Patent: November 1, 1988
    Assignees: Commissariat a l'Energie Atomique, Siegfried Klein
    Inventor: Siegfried Klein