Showing papers by "Satoshi Shimokawa published in 2010"

Wireless power supply system and wireless power supply method

Abstract: A wireless power supply apparatus includes: a transmitting coil configured to transmit power in the form of magnetic field energy using magnetic resonance; and a power transmitter configured to supply power at a resonant frequency that produces magnetic resonance between the transmitting coil and a receiving coil; wherein the power transmitter includes a detector configured to detect current flowing into the transmitting coil, a controller configured to control the frequency of the power supplied to the transmitting coil, and a determining unit configured to determine the coupling strength between the transmitting coil and the receiving coil on the basis of the frequency of the current detected by the detector as well as the frequency of the supplied power.

Wireless power apparatus and wireless power-receiving method

Abstract: A wireless power apparatus includes: a power receiver coil which receives power, as magnetic field energy, from a power transmitter coil by magnetic field resonance produced between the power transmitter coil and the power receiver coil; a power pickup coil which derives power from the power receiver coil by electromagnetic induction; a detector which detects current flowing through the power pickup coil; and a controller which controls a coupling strength between the power pickup coil and the power receiver coil based on the current detected by the detector.

Resonance frequency control method, power transmission device, and power reception device for magnetic-resonant-coupling type power transmission system

Abstract: Provided is a magnetic-resonant-coupling type power transmission system, wherein power is transmitted from a power-transmission side coil to a power-reception side coil utilizing magnetic resonant coupling, and wherein the resonance frequencies of the coils can be adjusted at high speed, with accuracy, and in real time. In this magnetic-resonant-coupling type power transmission system, the phase of the voltage supplied to the power-transmission side coil, and the phase of the current flowing through the power-transmission side coil or the power-reception side coil are detected, and the resonance frequencies of the power-transmission side coil or the power-reception side coil are varied so that the difference between the phases will become a target value. The power-transmission side coil comprises a power supplying coil to which an AC power supply is to be connected, and a power-transmission resonance coil electromagnetically coupled closely with the power supplying coil. The power-reception side coil comprises a power-reception resonance coil, and a power extraction coil electromagnetically coupled closely with the power-reception resonance coil. The phase difference between the phase of the voltage of the AC power supply and the phase of the current flowing through the power-transmission resonance coil is controlled to become a target value (β), and the phase difference between the phase of the voltage of the AC power supply and the phase of the current flowing through the power-reception resonance coil is controlled to become a target value (β - π/2).

Power receiving device and power receiving method

Abstract: A power receiving coil (13) in a power receiving device (3) receives the supply of energy from a power transmitting coil (12) in a power transmitting device (2) by using magnetic field resonance. The energy in the power receiving coil (13) is taken out as electric power by either of power taking-out coils (14_1 to 14_4) selected by a switch (31) and is used for charging a battery (34). A control circuit (35) selects either of the power taking-out coils (14_1 to 14_4) according to the state of charge of the battery (34), thereby improving the charging efficiency of the battery (34).

Wireless power transmission device

Abstract: The present invention addresses the problem of sufficiently suppressing influence of electromagnetic waves on the environment at a wireless power transmission device. To solve the problem, the wireless power transmission device includes a first coil emitting first electromagnetic waves toward an external coil. The wireless power transmission device also includes a second coil positioned close to the first coil without having the center axis thereof aligned with that of the first coil and emitting second electromagnetic waves having intensity distribution with a polarity opposite to that of the first electromagnetic waves.

Portable device and power supply system

Abstract: Provided is a portable device providing appropriate magnetic shielding when coil position is shared for a low frequency noncontact power supply and for high frequency communication. The portable device includes: a chassis; a coil at the outer surface side; a circuit which is placed on the inside of the chassis and which via the coil receives electric power on the basis of a first frequency, while carrying out communication on the basis of a second frequency; and a magnetic shield disposed between the coil and the inner region of the chassis. The first frequency is lower than the second frequency, and the magnetic permeability of the first part of the magnetic shield on the inner region side of the shield is higher than the magnetic permeability of the second part on the coil side of the shield under the aforementioned first frequency.

Image processing device, image processing method, computer program for image processing and imaging device

Abstract: PROBLEM TO BE SOLVED: To provide an image processing device capable of correcting a color tone of each pixel in an area on an image which is affected by an attachment attached between an imaging optical system and an image sensor.SOLUTION: An image processing device 6 is provided with a storage section 64 for storing a correction coefficient which compensates an effect in each color component of at least one pixel affected by an attachment attached in an optical path defined by an imaging optical system 2 between the imaging optical system 2 and an image sensor 3 in a reference image, formed by the image sensor 3, of a reference object image formed on the image sensor 3 by the imaging optical system 2. The device also includes a correction section 65 for generating a correction image by multiplying each color component of at least one pixel in an image of an object image which is formed on the image sensor 3 by the imaging optical system 2 by the correction coefficient corresponding thereto.

Hologram reproducing device and hologram reproducing method

Abstract: A hologram reproducing device includes a splitter for splitting a reference beam, during reproduction, into a main beam and sub-beams forming incidence directions spatially shifted from the main beam. The hologram reproducing device also includes: an incidence direction variable irradiator for changing the incidence directions of the main beam and the sub-beams; a servo beam detector for detecting a portion of the reproduction beam generated in accordance with the sub-beams; and a beam receiving unit for receiving the main portion of the reproduction beam generated in accordance with the main beam. A reproducer reproduces an image obtained by the beam receiving unit when the main beam coincides with the incidence direction at which the received light of the beam receiving unit becomes equal to or greater than a prescribed level, with the intensity of the reference beam kept uniform, on the basis of the servo beam detection results.

Imaging apparatus, image processing apparatus, and imaging method

Abstract: PROBLEM TO BE SOLVED: To generate an image whose depth of field is enlarged with high accuracy.SOLUTION: An imaging element 11 receives light from a subject through a phase modulation element 12. An image extracting unit 13 extracts a partial image P2 including a region where a point image is dispersed from a taken image P1 obtained by the imaging element 11. A restoration processing unit 14 performs a process for restoring a subject image on the taken image obtained by the imaging element 11 (for example, the taken image P1) by using the partial image P2 extracted by the image extracting unit 13 as a point spread function (PSF). Since the process for restoring the subject image is performed by using the point spread function obtained from the actual taken image, an error of the point spread function, which is caused by a manufacturing error of an optical system and the like, is less likely generated, and as a result, the subject can be restored with accuracy.