Patents Examined by George Wang
  • Patent number: 6456690
    Abstract: An X-ray generator, an X-ray inspector and an X-ray generation method capable of automatically focusing an energy beam, such as an electron beam for generating an X-ray, on a target are provided. The generation, inspector and the method have been developed by turning an attention on the fact that convergence conditions of an electron beam has a close relationship with a temperature on a surface of an X-ray tube target. The method comprises the steps of measuring the temperature changes at real time by a temperature sensor 14 and automatically controlling a current value of a focusing coil 6.
    Type: Grant
    Filed: December 20, 2000
    Date of Patent: September 24, 2002
    Assignee: mediXtec Japan Corporation
    Inventors: Koichi Yamada, Takeshige Tanigaki
  • Patent number: 6442307
    Abstract: In accordance with the invention, a MEMs mirror device comprises a mirror layer including a frame structure and at least one mirror movably coupled to the frame and an actuator layer including at least one conductive path and at least one electrode for moving the mirror. The mirror layer and the actuator layer are provided with metallization pads and are bonded together in lateral alignment and with predetermined vertical gap spacing by solder bonds between the pads. The device has utility in optical cross connection, variable attenuation and power gain equalization.
    Type: Grant
    Filed: November 3, 2000
    Date of Patent: August 27, 2002
    Assignees: Lucent Technologies Inc., Agere Systems Guardian Corp.
    Inventors: Dustin W. Carr, Dennis S. Greywall, Sungho Jin, Flavio Pardo, Hyongsok Soh
  • Patent number: 6426999
    Abstract: An X-ray apparatus with an X-ray source for producing a beam of X-rays, an X-ray detector for detecting the beam, and an X-ray filter with filter elements which is arranged between the X-ray source and the X-ray detector so as to attenuate the X-ray beam in each independent filter element individually. Each filter element can receive a liquid having electrically conducting properties and X-ray absorbing properties, the value of the X-ray absorption of the filter element being dependent on the level of the X-ray absorbing liquid in the filter element. Each filter element includes a first electrode (23) which is located in the wall of the filter element and on top of the substrate layer (38) in order to apply an electric potential to the wall of the filter element. A second electric potential is applied to the liquid via a second electrode.
    Type: Grant
    Filed: February 2, 2001
    Date of Patent: July 30, 2002
    Assignee: Koninklijke Philips Electronics N.V.
    Inventor: Menno Willem José Prins
  • Patent number: 6422747
    Abstract: In a movable type X-ray photographing apparatus, when a lever handle is operated, a force F for pushing the lever handle is inputted into a CPU from right and left pressure sensors provided in the handle. The CPU receives signals of rotational numbers V of motors from right and left encoders, and calculates a pulse width W=&agr;×f (V)×F. In accordance with the calculated pulse width W, a PWM control circuit carries out an ON-OFF duty control of a switching element in a bridge circuit of a motor driving circuit. An output torque T of the motor driving circuit is subjected to a PWM control so as to maintain a relationship (T=&agr;×f). Accordingly, the torque T truly proportional to the pushing force F is outputted from the motor, and a natural operation can be achieved.
    Type: Grant
    Filed: February 8, 2001
    Date of Patent: July 23, 2002
    Assignee: Shimadzu Corporation
    Inventors: Koji Akutsu, Tatsuya Araki
  • Patent number: 6411671
    Abstract: In a method and apparatus for reducing line artifacts in a CT image D1, which is acquired during a scan by a CT device with a detector system having a number of proper detector channels and at least one defective detector channel, the image M1 is obtained first by a median filtering the image D1, which contains a circle artifact on a circle K1. A difference value image F1=D1−M1 is then produced. Filtering then is carried out in each picture element of the image F1 in the direction of the tangents t11 and t21 to the circle K1 extending through the respective picture element in order to produce two resulting images G11 and G21. A correction image D2 is subsequently produced by subtracting the resulting images G11 and G21 from D1.
    Type: Grant
    Filed: March 1, 2001
    Date of Patent: June 25, 2002
    Assignee: Siemens Aktiengesellschaft
    Inventors: Herbert Bruder, Thomas Flohr, Karl Stierstorfer, Thomas Von Der Haar
  • Patent number: 6411409
    Abstract: In the area of wavelength division multiplexing (WDM), the present invention relates to a demultiplexer/multiplexer based on a diffraction grating, in which a beam of light is separated into two orthogonally polarized sub-beams prior to beam collimation. Due to the characteristics of the beam splitting crystal, parts of the sub-beams overlap resulting in portions of the sub-beams becoming improperly polarized. Too alleviate the errors cause thereby, an iris is placed over the diffraction grating to eliminate the portions of the light that have been polarized improperly.
    Type: Grant
    Filed: November 9, 2000
    Date of Patent: June 25, 2002
    Assignee: JDS Uniphase Inc.
    Inventor: Thomas Ducellier
  • Patent number: 6396965
    Abstract: A twisting fiber depolarizer has sections of a birefringent (HiBi) fiber spliced to opposing ends of a nominally non-birefringent fiber, such as a single mode fiber, between a pair of hold points to produce a fiber assembly. Means is applied to the free portion of the fiber assembly between the hold points for twisting the free portion of the fiber assembly with a back and forth motion to depolarize an optical signal input to one end of the fiber assembly.
    Type: Grant
    Filed: November 22, 2000
    Date of Patent: May 28, 2002
    Assignee: Tektronix, Inc.
    Inventor: Duwayne R. Anderson