Kabushiki Kaisha Toyota Chuo Kenkyusho

Toyota Jidosha Kabushiki Kaisha

Toyoda Gosei Co., Ltd.

Toyota School Foundation

Denso Corporation

Denso Wave Corporation

Cataler Corporation

Satoru Kato

Hiroshi Ito

Tadashi Ichikawa

Tetsu Kachi

Kazuo Hasegawa

Daisuke Inoue

Tomoya Okazaki

Kazuya Saito

Naoki Takahashi

Kenji Ito

Satoshi Suzuki

Kazuyoshi Tomita

Tadashi Suzuki

Takahiro Kozawa

Takaaki Kanazawa

Kunihiko Ito

Kenji Okazaki

Tatsuya Yamashita

Manabu Kagami

Mitsuhiro Inoue

Michihiko Takeuchi

Masanori Yamato

Yoshimi Kitazumi

Toshihiko Tsukada

Motoichi Nakayama

Chie Toyoda

Masanori Kojima

Yuuji Matsuhisa

Kazuhiro Yoshimoto

Yoshinobu Wada

Kazuyohi Tomita

Shigeru Fukumoto

Arindam Halder

A first fiber is connected to a first end of a third fiber doped with a rare earth element, and a second fiber is connected to a second end of the third fiber. In the third fiber doped with the rare earth element, a central portion of a core is more heavily doped with the rare earth element than a peripheral portion of the core is.

Optical fiber laser device

A reflector includes a gain fiber and a periodic refraction structure unit. The gain fiber has a core doped with a rare earth element. The periodic refraction structure unit includes a high-refractive-index region that has a predetermined width, that is formed at a predetermined spacing along an optical axis direction of the gain fiber, that is formed across an entire section of the core that is orthogonal to the optical axis of the core, and that has a first refractive index, and a low-refractive-index region that is formed adjacent to the high-refractive-index region, that has a width equal to the predetermined spacing, and that has a second refractive index lower than the first refractive index. A width dof an iperiodic structure of refractive index in the periodic refraction structure unit is given by the equation d=H&#xb7;(&#x3bb;/(2&#xb7;n))+&#x3bb;/(4&#xb7;n).

Reflector, fiber cavity, and fiber laser

A radar apparatus which can simply determine the sign of velocity of an object is provided. Laser light reflected by the object undergoes quadrature optical heterodyne detection performed by mixers, optical detectors, and a &#x3c0;/2 phase shifter, whereby I and Q component signals are output. A frequency analyzer performs FFT on a complex signal composed of the I component signal (real part) and the Q component signal (imaginary part) to thereby obtain its frequency spectrum. Since the frequency spectrum is calculated without being folded back even in a region where the frequency is negative, the sign of the Doppler frequency fd can be determined. When the Doppler frequency fd is positive, the sign of the velocity of the object is a direction toward the radar apparatus. When the Doppler frequency fd is negative, the sign of the velocity of the object is a direction away from the radar apparatus.

Radar apparatus and method of determining sign of velocity

There is provided a device for reading a code on a subject. The device includes an imaging unit provided with an imaging element, a depth-of-field extending unit, and an optical distorting unit. The imaging unit captures an optical image formed on a light-receiving surface of the subject. The depth-of-field extending unit acquires a focused image regardless of distance to the subject, within a predetermined read-out range. In the optical distorting unit, the captured optical image is distorted such that i) the focused image at a minimum distance in the read-out range includes an overall image of the code and ii) the focused image at a maximum distance in the read-out range is provided so as to allow at least a predetermined number of pixels to be assigned to a unit image of the code.

Device for optically reading information codes

A catalyst for purification of exhaust gas, in which a noble metal is supported on a metal oxide support, has a basic site content of 1 mmol/L-cat or less, as determined on the basis of an amount of COdesorbed per liter of the catalyst as measured by a COtemperature-programmed desorption method.

Catalyst for purification of exhaust gas, and apparatus and method for purification of exhaust gas using the catalyst

A safety valve of the invention including a cleavable groove is provided in a battery case of a sealed battery containing a power generating element inside. The cleavable groove is partly formed with a measuring groove having a width wider than other portions. Even if other portions of the cleavable groove have fairly small groove width, a groove width of the cleavable groove can be obtained and determined the quality by measuring a groove width of the measuring groove. Thereby, a safety valve and a manufacturing method thereof, a sealed battery and a manufacturing method thereof, a vehicle, and a battery mounting device are provided to achieve less variation of valve opening pressure and stable product quality, as well as reliably assure the good quality.

Safety valve and manufacturing method thereof, sealed battery and manufacturing method thereof, vehicle, and battery mounting device

A light-emitting device includes a light-emitting diode, a red light-emitting phosphor layer, a yellow light-emitting phosphor layer, and a blue light-emitting phosphor layer. These layers are stacked in the stacking sequence of the yellow, blue, and red phosphor layers in order of increasing distance from the LED. The stacking sequence of the yellow and blue phosphor layers is first determined in such a manner that these layers do not interact with each other. The stacking sequence of the red and yellow phosphor layers and the stacking sequence of the red and blue phosphor layers are determined by the discriminant D. This determination of the stacking sequence suppresses a reduction in the conversion efficiency of the phosphors due to concentration quenching, improving the emission efficiency of the light-emitting device.

Light-emitting device including light-emitting diode and stacked light-emitting phosphor layers

A light source comprising a light emitting diode comprising a GaN-based compound and having a single quantum well structure, and a driving voltage source for applying a pulse voltage to the light emitting diode, wherein a voltage at a low level of the pulse voltage is set to a voltage lower than a voltage at which a fall time of the light emitting diode is made the longest.

Light source

An increased proportion of light projected from a nitride semiconductor light emitting diode enters the area within a specified angle. The nitride semiconductor light emitting diode is provided with an active layerconsisting of a nitride semiconductor, and a light projecting faceA reflecting mirroris formed only on a side of the active layeropposite the light projecting faceThe reflecting mirroris formed at a location from the center of the active layerapproximately (k&#xb7;&#x3bb;/2+&#x3bb;/4)/n (where &#x3bb; is the wavelength of light projected from the active layern is the mean refractive index of an area between the active layerand the reflecting mirrorand k is an integer). This light emitting diode allows directivity to be increased sufficiently, and the coupling efficiency thereof with optical fiber consisting of POF or the like can be improved.

Nitride semiconductor light emitting diode

The invention provides a GaN green LED drive device comprising: a bias current output unit for outputting a pulse-like bias current having a low level higher by a predetermined value than a zero level; and a peaking unit for peaking the bias current outputted from the bias current output unit to make rise of the bias current higher than a high level and make fall of the bias current lower than the low level to thereby obtain a peaked bias current supplied to a GaN green LED. The bias current is peaked while the low level of the bias current is set at a higher value (10 mA) than that in the related art. Hence, the fall time tbecomes 6.6 nsec. The fall time tcan be shortened greatly compared with that in the related art.

GaN green LED drive device and optical transmission device

A compact voltage sensor with stable characteristics is provided. A measuring beam that is incident from an optical fiber is branched into first and second modulation-inducing waveguides of a wave branching/combining section within an optical integrated circuit. Phase changes of opposite sign are induced in the measuring beams propagating within the first and second modulation waveguides by applying voltages of mutually opposite sign to modulation-inducing electrodes, to induce a phase difference between the two. By reflecting the measuring beams from a reflective surface, propagating them back in the opposite direction within the first and second modulation waveguides, and passing them through the optical intensity modulation section again, thus applying a further phase modulation thereto, the phase difference between the measuring beams proceeding in the opposite direction within the first and second modulation waveguides can be made to be substantially twice the phase difference of the measuring beams before they are reflected by the reflective surface. The sensor also has a function to protect a sensor section thereof from dielectric breakdown caused by the accidental input of a high voltage.

Optical integrated voltage sensor for optically measuring the magnitude

A laser Doppler velocimeter in which laser light whose frequency changes continuously at least for a fixed time duration is branched into at least two beams, and the at least two branched beams are respectively transmitted by at least one pair of optical fibers having an optical path difference therebetween, and are focused onto a region to be measured by at least one focusing device. The scattered light of the laser beams focused in the region to be measured are received by a light-receiving device via at least one incident device. At least one Doppler shift frequency in the region to be measured is calculated on the basis of the frequency of a signal of the scattered light received by the light-receiving device, the optical path difference, and a rate of change of the frequency of the laser light. The flow velocity and the direction of the flow velocity are calculated from the calculated Doppler shift frequency.

Laser doppler velocimeter

An electromagnetic field intensity measuring apparatus comprises a sensor located in the electromagnetic field measuring place for receiving the measuring light from the optical fiber, the sensor being adapted to modulate the measuring light entering the sensor depending on the intensity of the electromagnetic field, the modulated light being then re-applied to the optical fiber; a polarization rotating device located between the measuring light generating device and the optical fiber, the polarization rotation device being operative to cause the polarized wavefront of the measuring light passed therethrough to rotate a given angle in the direction of passage; and a polarization beam splitter disposed between the measuring light generating device and the polarization rotating device, the polarization beam splitter being operative to permit only the measuring light from said measuring light generating device to pass through said polarization beam splitter and also to reflect the modulated measuring light inputted through the polarization rotating device in a predetermined direction. The electromagnetic field intensity in the measuring place can be calculated, based on the amplitude of the measuring light reflected by the polarization beam splitter.

Fiberoptic apparatus for measuring electromagnetic field intensity with

An electromagnetic field intensity measuring apparatus capable of measuring an electromagnetic field intensity accurately and sensitively without affection by any disturbance, including a measuring light generating section for emitting a measuring light containing first and second polarized light components which are orthogonal to each other and slightly different in frequency from each other; an optical input polarization-maintaining fiber for receiving one of the first and second polarized light components in the direction of X-axis polarization and the other polarized light component in the direction of Y-axis polarization, the optical input polarization-maintaining fiber conducting the measuring light to the electromagnetic field measuring place; a sensor section disposed in the electromagnetic field measuring place, the sensor section receiving the measuring light from the optical input polarization-maintaining fiber and modulating the phase of the incident measuring light depending on the electromagnetic field intensity; and an optical output polarization-maintaining fiber for receiving one of the first and second polarized light components from the sensor section in the direction of X-axis polarization and the other polarized light component in the direction of Y-axis polarization, the optical output polarization-maintaining fiber conducting the measuring light outside the electromagnetic field measuring place. The phase difference between the first and second polarized light components contained in the measuring light from the optical output polarization-maintaining fiber is detected to determine the electromagnetic field intensity.

Apparatus for measuring electromagnetic field intensity using dual

An apparatus measures the intensity of an electric field with a compact sensor equipped with a light modulater of a Mach-zender interferometer type and a condenser-type antenna. The sensor modulates coherent measuring lights propagated through branched two optical paths according to the voltage induced on the surfaces of plates of a condenser-type antenna of the sensor. The modulated lights are merged and interfered with each other and result in merged light different in intensity from the original measuring light. A waveguide-type optical integrated circuit formed in the sensor calculates the intensity of the merged light having the intensity dependent on the intensity of the magnetic field.

Growing community of inventors

Nisshin, Japan

Satoru Kato