Asahi Glass Company, Limited

Elna Co., Ltd.

Mitsubishi Electric Corporation

Nec Display Solutions, Ltd.

Okamura Laboratory, Inc.

Mitsubishi Denki Kabushiki Kaisha

Jeol Ltd.

Osaka Gas Company Limited

Takeshi Morimoto

Yoshio Oda

Kazuya Hiratsuka

Kohji Suzuki

Manabu Tsushima

Manabu Suhara

Toshiya Matsubara

Takeshi Kawasato

Yasuhiro Sanada

Takashige Yoneda

Fumiaki Gunji

Eiji Endoh

Yong Che

Taichiro Tamida

Shingo Tsuda

Keiichi Uchida

Yoshiki Hamatani

Toshiaki Watanabe

Michio Okamura

Katsuji Ikeda

Toshiki Koshimae

Takashi Hashimoto

Akihiko Iwata

Hiroshi Aruga

Naoki Yoshida

Keisuke Abe

Teruaki Fukuoka

Hidemi Yamada

Satoshi Takemiya

Hiroshi Ikarashi

Naoto Iwano

Hideo Shimizu

Jun-ichi Shimoyama

Yukiko Ono

Shigeo Komatsu

Hirokazu Takagi

Seisaku Kumai

Kazuo Sato

Hiroyuki Fujita

Kimihiko Sato

Kenji Ishizeki

Akihiro Suzuki

Shinsuke Morikawa

Yasuo Hayashi

Tomohiro Kyoto

Hiroyuki Tomonaga

Satoshi Takeda

Masaru Yoshitake

Yasuo Sajima

Hiroaki Kurokawa

Makoto Fukawa

Makoto Nakao

Hiroyuki Fujimoto

Reiichi Kobayashi

Hiromichi Nishimura

Toshiyuki Maeda

Taira Ogita

Shinji Kondoh

Hideyasu Machii

Hiroshi Ariga

Jun-ichiro Kase

Mikio Sasabe

Yoshikatsu Kimura

Shinichi Ohashi

Keiko Kubota

Takeshi Yoshizuka

Keiko Ohashi

Shinji Matsumoto

Karl Ludger Neumann

A laser diode driving power source of a laser machining device that radiates laser light emitted from an LD to a workpiece to machine the workpiece includes a power converter including a switching device, to supply a current to the LD, and a control unit to control a switching operation of the switching device. A value smaller than a value that is n times a time constant for laser machining is set as a switching period of the switching device in the control unit, the n is larger than 1, and the time constant for laser machining is a value obtained by dividing a surface roughness required for machining of the workpiece by a moving velocity of the workpiece.

Laser diode driving power source and laser machining device

A laser device, including multiple laser modules, includes a plurality of drive power units that drive the laser modules, a plurality of output detection units that detect laser outputs from the laser modules, and output detected values as first output signals, a coupled output detection unit that detects a total laser output after coupling of a plurality of the laser outputs, and outputs a detected value as a second output signal, a computing unit that sets multiple output correction factors for correspondingly controlling the laser modules using the plurality of first output signals and the second output signal, and a control unit that controls the plurality of drive power units using the multiple output correction factors. The multiple output correction factors are each set to allow the total laser output to be maintained at a constant value.

Laser device, laser machining apparatus, and method for controlling output of laser device

A laser diode-driving power supply includes a constant current source that supplies current to LDs, a switching element connected in parallel to the LDs, and a control unit that controls the constant current source and performs on-off control of the switching element. The control unit compares a first current command value and a second current command value for controlling current output from the constant current source, and when the second current command value input after the first current command value is smaller than the first current command value, applies to the LDs a voltage in the range of a voltage at which current flows through the LDs to a voltage less than the lasing threshold of the LDs when there is no output from the LDs.

Laser diode-driving power supply and laser machining apparatus

A power supply apparatus includes a power supply for supplying power to a laser oscillator. A reactor has one end serially connected to the laser oscillator and another end serially connected to the power supply, and a parallel diode configures a closed circuit for serial connection of the laser oscillator and the reactor. A current detector detects a current flowing in the reactor, and a first switching device is connected in parallel to the laser oscillator and drives the laser oscillator with pulses. An energy consumption circuit prefetches a current command value based on a control signal from a controller upon driving the laser oscillator with pulses, and when the current command value is smaller than a current command value of a previous pulse, the energy consumption circuit consumes energy until the current command value reaches a predetermined target current value.

Power supply apparatus for driving laser diode provided with power supply for supplying power to laser oscillator

An image display apparatus (and a method for dimming a light source) includes a light source and display units that spatially modulate a light from the light source on the basis of an input video signal to form an image, and performs dimming control to adjust luminance of the light source in stages. The image display apparatus includes a light source dimming unit that determines whether to perform dimming control on the basis of the input video signal, acquires a dimming rate, which is a ratio of brightness of an input image to a maximum luminance output from the light source, and sets the output of the light source to the maximum luminance output when a dimming rate of a frame immediately before a frame determined not to be subjected to dimming control is lower than a threshold.

Image display apparatus and method for dimming light source

An image display device and a light source dimming method are provided for enabling display of an image with natural brightness through dimming control. The image display device includes: a light source; a display unit that spatially modulates light from the light source on the basis of an input video e signal to form an image; a histogram acquisition unit that, on the basis of the input video signal, acquires a first histogram, in which image data is indicated by the frequencies of levels of brightness, and a second histogram having a number of levels of brightness that differs from the number of levels of brightness of the first histogram; and a control unit that performs dimming control that adjusts the luminance of the light source on the basis of the first and second histograms.

Image display device and method for dimming light source

A current control device for controlling, on the basis of a current command value input from an external device, a light-emitting unit current flowing from a power supply device to a light-emitting unit that includes one or a plurality of laser diodes, includes: a switching element coupled in parallel to the light-emitting unit; and a pulse-width-modulation control circuit unit to provide pulse width modulation control of the switching element in a case in which an output current output from the power supply device is greater than a present current command value or a next current command value upon a start of supply of, upon a termination of supply of, or during supply of, the light-emitting unit current.

Current control device and current control method

A light source unit emits a plurality of basic light beams of differing colors and a supplemental light beam of the same color as any of the colors of the plurality of basic light beams. A control unit (), on the basis of an input picture signal that is received as input, supplies a first modulating signal for modulating each basic light beam that accords with the color of each pixel of an image indicated by the input picture signal and a second modulating signal for modulating the supplemental light beam in accordance with the specific color level in each pixel that indicates the degree of similarity between the color of the pixel and, of the colors of the plurality of basic light beams, a prescribed color that differs from the color of the supplemental light beam. Modulation units () modulate and emit the basic light beams in accordance with the first modulating signal and modulate and emit the supplemental light beam in accordance with the second modulating signal.

Projector, color correction device, and projection method

A liquid crystal display device includes a liquid crystal panel including a plurality of liquid crystal cells, a common voltage generation circuit that supplies a common voltage to the liquid crystal panel, a liquid crystal drive circuit that implements control for supplying the plurality of liquid crystal cells with voltage that accords with a video signal to display an image on the liquid crystal panel, and for reversing a polarity of the voltage supplied to the plurality of liquid crystal cells, and an adjustment module that stores characteristics data for correcting fluctuations in brightness and, based on the characteristics data, adjusts the brightness of the image displayed on the liquid crystal panel.

Liquid crystal display device and liquid crystal panel drive method

A laser output power command determination value from a controller () is input to an upper limit current determination unit (), and an upper limit current value to be decided based on the laser output power command determination value is determined. Then, a second comparator () compares a command current value determined from the laser output power command determination value and a laser output power command determination value measured with a power monitor (), with an upper limit current value determined with a upper limit current determination unit (). The second comparator () determines a command current value when the upper limit current value is greater than the command current value and the upper limit current value when the command current value is greater than the upper limit current value, as a reference current value, by which reference current value a current to be supplied to pumping means is configured to be controlled. In such a configuration, an upper limit current value is determined according to a laser output power command determination value, whereby an increased current to be supplied to the pumping means, i.e., the increase of energy to be supplied to a laser oscillator apparatus is avoided, and an energy loss in the optical component is reduced, which prevents damage development from leading to the replacement of the component.

Laser oscillator apparatus and power supply apparatus therefor, and control method therefor

A laser generator includes a generation means for pumping by a pumping light source () a pumping medium () to generate a fundamental-wave laser beam, an output sensor () for measuring average output power or pulse energy of the fundamental-wave laser beam, a wavelength-conversion element (), arranged on an optical path for the fundamental-wave laser beam, for converting the fundamental-wave laser beam into its higher-harmonic-wave laser beam, and a controller () for memorizing a determination value set to a value lower than a breakage threshold for average output power or pulse energy of the laser beam converted by the wavelength-conversion element (), and for, when the measurement value becomes not lower than the determination value, controlling the output power of the fundamental-wave laser beam to be a value lower than the breakage threshold; thereby, the beam intensity through the wavelength-conversion element () never exceeds the breakage threshold, and thus breakage of the wavelength-conversion element () can be prevented.

Laser generator and method of controlling the same

Plural LDsare series-connected and pump a solid-state pumping medium. Each of bypass circuitsis connected in parallel to an associated one of the LDs. An operation of driving each of the bypass circuitsis controlled by a control circuit. A detection circuitis provided corresponding to each of the LDsand detects a short circuit failure and an open failure of each of the LDsaccording to a voltage developed thereacross or the like. The detection circuitand the control circuitare connected to and are controlled by an LD shortcircuit control circuit. In a case where a failure of the LD is detected by the detection circuit, the LD shortcircuit control unitdetermines the position of the failed LD to bypass electric current having flowed through the failed LD. Then, the control circuitsends a signal to a predetermined control circuitto thereby operate a predetermined bypass circuit. The LD shortcircuit control unitdetermines the position of the LD, which is to be turned off, according to the position of the failed LD to improve a pointing deviation in the solid-state medium. Then, the control unitsends a signal to the control circuitto turn off this LD. Thus, the control unitcauses a predetermined bypass circuitto operate thereby to turn off the predetermined LD.

Laser diode pumped solid-state laser oscillator and laser diode control method of the oscillator

A secondary power source comprising a positive electrode made mainly of activated carbon, a negative electrode made mainly of a carbon material capable of doping and undoping lithium ions and an organic electrolyte containing a solute of a lithium salt, wherein the lithium salt comprises LiN(SOR) (SOR) wherein each of Rand Rwhich are independent of each other, is a Cperfluoroalkyl group except R&#x2550;R&#x2550;CF.

Secondary power source

A secondary power source, which comprises a positive electrode containing activated carbon, a negative electrode containing a carbon material capable of doping and undoping lithium ions, and an organic electrolyte containing a lithium salt, wherein the negative electrode has a density of from 0.6 to 1.2 g/cm.

A secondary power source, which comprises a positive electrode containing activated carbon, a negative electrode containing Li Ti O , and an organic electrolyte containing a lithium salt.

Secondary power source having a lithium titanate

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Yokohama, Japan

Takeshi Morimoto