Ushio Denki Kabushiki Kaisha

Kyoto University

Hiroshige Hata

Kiyoyuki Kabuki

Shinji Sugioka

Kyoichi Deki

Masaki Yoshioka

Ken Kataoka

Masaki Inoue

Koichi Kamei

Masanori Yamaguchi

Yutaka Shiozaki

Yoichi Kawakami

Hiroyuki Takada

Mitsuru Funato

Kaoru Nakamura

Ryan Ganipan Banal

Takao Oto

Tsuyoshi Maesoba

Koichi Okamoto

A light emitting element includes an LED element that emits an excitation light having a single peak wavelength within a range of greater than or equal to 380 nm and less than or equal to 500 nm; a fluorescent body to which at least a portion of the excitation light enters to emit fluorescence; and a light extraction surface that emits an output light formed by superimposing the excitation light and the fluorescence. The output light exhibits light emission over a range of at least greater than or equal to the peak wavelength of the excitation light and less than or equal to 1050 nm, and all of the output light have a light emission intensity of greater than or equal to a light emission intensity at 1050 nm within a range of at least the peak wavelength of the excitation light to 1050 nm.

Light emitting element

The present invention is intended to provide an electron-beam-pumped light source capable of irradiating one surface of a semiconductor light-emitting device uniformly with an electron beam, and capable of obtaining a high light output without increasing an accelerating voltage of the electron beam and, in addition, capable of efficiently cooling the semiconductor light-emitting device. An electron-beam-pumped light source of the present invention includes: an electron beam source and a semiconductor light-emitting device excited by an electron beam emitted from the electron beam source, and characterized in that the electron beam source includes a planar electron beam emitting portion and arranged in the periphery of the semiconductor light-emitting device, and light exits from a surface through which the electron beam from the electron beam source of the semiconductor light-emitting device enters.

Electron-beam-pumped light source

A illuminating device used for an document reading apparatus that has two rod shape light guides and light emitting elements where each of the light guides has a light emitting face and two flat light reflection faces, which may have a group of minute prisms that are formed along the longitudinal direction of the faces, and where light from each light emitting element is guided in the longitudinal direction by the light guide and reflected by that faces, such that the light is emitted from the light emitting face of each light guide and a virtual plane that is vertical to a longitudinal direction of each of the two light guides has two light intensity peaks.

Illuminating device

Provided is a compact ultraviolet irradiation apparatus which is capable of emitting ultraviolet radiation with high efficiency. This ultraviolet irradiation apparatus includes, in a vessel, a semiconductor multi-layered film element and an electron beam irradiation source for irradiating the semiconductor multi-layered film element with an electron beam, the vessel being hermetically sealed to have a negative internal pressure and having an ultraviolet transmitting window. Furthermore, the semiconductor multi-layered film element includes an active layer having a single quantum well structure or a multi quantum well structure of InAlGaN (0&#x2266;x&#x3c;1, 0&#x3c;y&#x2266;1, x+y&#x2266;1), and the active layer of the semiconductor multi-layered film element is irradiated with an electron beam from the electron beam irradiation source. This allows the semiconductor multi-layered film element to emit ultraviolet radiation out of the vessel through the ultraviolet transmitting window. Furthermore, Equation (1) below is satisfied,4.18&#xd7;10.6&#xd7;&#x2003;&#x2003;Equation (1)where V (kV) is the acceleration voltage of the electron beam and t (nm) is the thickness of the active layer.

Ultraviolet irradiation apparatus

A light source apparatus includes first and second light direction changing faces that extend in a longitudinal direction, a light guiding member having first and second light emitting faces that are formed to respectively face the first and second light direction changing faces and a light source that is arranged on one end face of the light guiding member. A first vertical plane extending in a longitudinal direction with respect to the first light direction changing face and a second vertical plane extending in a longitudinal direction with respect to the second light direction changing face intersect. A groove which extends in a longitudinal direction of the light guiding member is formed between the first and second light direction changing faces. A surface forming the groove may be parabolic in a cross section.

Bifurcated linear light source apparatus

A light guiding member in a shape of a rod shape comprises a light receiving portion formed on an end thereof in an axial direction thereof, and a knurled recess portion which extends in the axial direction, is formed on a side face thereof, wherein the knurled recess portion has two or more recesses, a side face of each recess in a light receiving portion side is a reflective surface, the reflective surface of at least one of the recesses having a primary reflective surface and a secondary reflective surface.

Light guiding member and linear light source apparatus

A light guiding member having a light direction changing face which extends in a longitudinal direction of the light guiding member and a light emitting face which faces the light guiding member, wherein the light direction changing face includes two faces arranged so that vertical faces which extend in the longitudinal direction and are respectively vertical to the two faces, intersect with each other. Also, a bifurcated linear light source apparatus comprises a LED, a light guiding member which is made up of a transparent rod shape member, and which emits light generated by the LED, in two directions, from a longitudinal direction side face of the transparent rod shape member, and a reflection mirror which reflects the light emitted in one of the two directions, to the other direction of the two directions.

Light guiding member and bifurcated linear light source apparatus

An LED light source device using light from luminescent elements at a high level of uniformity and efficiency, and to conduct irradiation with a high level of design freedom an LED light source device is equipped with luminescent elements and a translucent light-guiding member. The translucent light-guiding member has a central convex lens with a first cylindrical light-guiding part formed on the outer periphery of the central convex lens and a second cylindrical light-guiding part formed on the outer periphery of the first cylindrical light-guiding part, such that an air layer is formed between the outer peripheral surface of the first cylindrical light-guiding part and the inner peripheral surface of the second cylindrical light-guiding part, the outer peripheral surface of the first cylindrical light-guiding part and the outer peripheral surface of the second cylindrical light-guiding part being rotated quadratic surfaces with the same focal point.

LED light source device

A radiant heating apparatus for heating one or more workpieces, comprises at least one flash discharge lamp, a discharge circuit having a condenser, connected in series to the at least one flash discharge lamp, for supplying voltage to the at least one flash discharge lamp; and a non-contact current detecting sensor provided in the discharge circuit wherein the current detecting sensor detects in a non-contact state discharge current flowing through the discharge circuit whereby it is possible to compensate condenser deterioration and also it is possible to detect an abnormal state of the discharge circuit based on outputs from the non-contact current detecting sensor.

Radiant heating apparatus and discharge current detecting circuit therefor

A method for automatically adjusting an optical axis of a laser resonator. Specifically, the angle of a mirror in a laser resonator is changed in a very small stepwise increments, and the laser output before the very little change is compared to the laser output after the incremental change. If the laser output after the very small incremental change is larger than the laser output before the very small incremental change, the angle is automatically changed by a very small amount in the same direction as the previous increment. If the laser output after the very small incremental change is smaller than the previous laser output measurement, the angle is automatically changed by a very small amount in the opposite direction. Thus the optical axis of the laser resonator is adjusted automatically.

Method for automatically adjusting the optical axis of a laser resonator

A metal vapor laser device wherein the pressure of carrier gas within a metal vapor laser tube can be normally maintained constant and a stabilized laser beam can be generated. The metal vapor laser device comprises a metal vapor laser tube, and a carrier gas supplier for supplementing carrier gas into the metal vapor laser tube. The carrier gas supplier includes an outer tube substantially impermeable to the carrier gas, and an inner tube having a permeability to the carrier gas which varies according to temperature and partitioning the inside of the outer tube into a reservoir section and a tank section. The inner tube is disposed in the tank section of the outer tube in such a manner as to form a duplex tube. The carrier gas supplier further includes a heater provided on outer peripheries of regions of the outer tube including the reservoir section and the tank section.

Metal vapor laser device

A metal vapor laser device which prevents a possible discharge between an electrode and a pressure detector thereof and can generate a laser beam in a stabilized condition. The metal vapor laser device comprises a metal vapor laser tube, a carrier gas supplier, and a pressure detector. The carrier gas supplier communicates with a discharge spacing within the laser tube by way of a communicating hole formed at an end portion thereof. The pressure detector includes a tube defining a pressure detecting chamber therein and communicating with the inside of the carrier gas supplier, and an energizable detecting element provided in the inside of the pressure detecting chamber. A discharge preventing thin tube is provided in the inside of the carrier gas supplier and has an end connected to the end portion of the carrier gas supplier in such a manner as to surround the communicating hole of the carrier gas supplier. The discharge preventing thin tube extends toward the other end portion of the carrier gas supplier farther than a connecting portion of the carrier gas supplier to the pressure detector, and the other end thereof is opened within the carrier gas supplier.

A metal vapor laser device which can generate laser oscillations stably even if the atmospheric temperature of a metal vapor laser tube thereof varies suddenly. The metal vapor laser device comprises a metal vapor laser tube having a metal tank in which a working metal is contained, a heater for heating the metal in the metal tank, a power source circuit for the heater, a voltage detector for detecting an inter-electrode voltage of the laser tube, and a temperature detector for detecting an atmospheric temperature of the laser tube. The power source circuit includes a controlling circuit for controlling a power supply to the heater in response to detection signals from the voltage detector and the temperature detector to maintain the pressure of the metal vapor within the laser tube constant. When the atmospheric temperature of the laser tube varies suddenly, the operation of the heater is thus feed-forward controlled in response to the detection signal from the temperature detector.

Growing community of inventors

Hyogo, Japan

Hiroshige Hata