Ushio Denki Kabushiki Kaisha

Takeo Matsushima

Yoichiro Higashimoto

Kyosuke Fujina

Yasuro Kikuchi

Yutaka Mune

Takahiro Inoue

Kenji Ishida

Tatsushi Igarashi

Yukio Yasuda

Toshihiro Nakajima

Tatsumi Hiramoto

Hiromitsu Matsuno

Yasushi Omae

Motonori Tada

Shinichi Iso

Junichi Kinoshita

Masaharu Otsuka

A light source device includes a plurality of LED elements dispersed and arranged in a plane direction orthogonal to an optical axis, a first optical system that converts light emitted from each of the LED elements into collimated light; and a second optical system that focuses the collimated light. The first optical system includes a first collimating optical system including optical components disposed corresponding to the LED elements and a second collimating optical system including optical components disposed corresponding to the LED elements at the latter stage of the first collimating optical system. The second collimating optical system is capable of adjusting a relative optical positional relation with respect to the LED elements and the first collimating optical system when viewed in a direction of the optical axis in a state in which the LED elements and the first collimating optical system are fixed.

Light source device

This light irradiation device is provided with: an LED substrate, on which a plurality of LED chips that emit ultraviolet light are arrayed in a first direction; and a cover capable of transmitting the ultraviolet light emitted from the LED chips. When a plane, on which an intersection point that the light emitted from the LED chips positioned at both ends in the first direction reach is positioned, said plane being parallel to an LED substrate surface, is specified as a reference plane Z, the distance between the LED substrate surface and the reference plane Zis represented by D (mm), and the distance between the LED substrate surface and a cover outer surface is represented by W (mm), W satisfies formula W&#x3c;D.

Light irradiation device and image forming device

The light source device of the present invention has a light source unit having a plurality of LED elements; a first optical system that collimates each of light emitted from the light source unit; and a second optical system that collects a plurality of light emitted from the first optical system. At least one of the light source unit and the first optical system is provided with an adjustment mechanism for adjusting a positional relationship between the light source unit and the first optical system relative to each other.

A light irradiation device includes a plurality of light-emitting portions that emit light by being supplied with a current. The light-emitting portions each have a first power supply terminal, and a second power supply terminal; a plurality of light-emitting elements; and a wiring pattern. The wiring pattern has a first wiring region and a second wiring region. Two of the light-emitting portions that are disposed adjacent to each other are disposed such that the space between the respective first wiring regions or the space between the respective second wiring regions is smaller than the space between the first wiring region of one of the light-emitting portions and the second wiring region of the other of the light-emitting portions.

Light irradiation device

To stabilize the illumination fluctuation rate of a short arc type discharge lamp of the type having a pair of electrodes disposed inside an arc tube in a manner of facing each other and a hydrogen getter, by absorbing hydrogen gas in an arc tube without causing a decline in the performance of the short arc type discharge lamp arising out of a hydrogen getter, the hydrogen getter is formed of a hollow container made of a material that allows the transmission of hydrogen with a getter material sealed tightly inside the hollow container, and a holder for the hydrogen getter is held on the electrode with the hydrogen getter fixed in the holder.

Short arc type discharge lamp

To provide a flickerless discharge lamp which can remove hydrogen by a simple and safe means even if the lamp is a large discharge lamp with high pressure when lit, the discharge lamp has a pair of electrodes and a hydrogen getter () in the interior of an arc tube, the hydrogen getter () being formed of a container () made of metal which is hydrogen permeable and a hydrogen absorbent body () that is composed of a metal which can absorb hydrogen that is enclosed inside of the container () and is fixed to an inside wall of the container ().

Discharge lamp with a pressure-resistant hydrogen getter

A short arc discharge lamp has improved starting properties in which there is no danger of damaging the arc tube that surrounds a discharge space and in which the radiant light from the arc tube is not adversely shielded. This is achieved by providing the short arc discharge lamp with a first electrode having an electrical potential and to which a high voltage is applied, and a second electrode opposite the first at a in spaced relationship. Additionally, in the discharge space, there is positioned at least one conductive component with a tip projecting into the discharge space. The conductive component has an electrical potential which is identical to the electrical potential of the first electrode and has a tip spaced a distance from the second electrode which is greater than the distance between the first and the second electrode.

Short arc discharge lamp and light source device

The rare gas discharge lamp is supplied with a current, which is lower than the rated current, the voltage of the rare gas discharge lamp is determined at this instant and the swing width of this voltage is measured. A comparator for comparing measured values of the swing width of the voltage of the rare gas discharge lamp when the current control supplies a reduced current, which is lower than the rated current. A service life converter for converting the difference value output by the comparison means into an indication of the service life of the rare gas discharge lamp.

Process for anticipating the service life of a rare gas discharge lamp and a system for anticipating the service life of rare gas discharge lamp

It is an object to provide a xenon discharge lamp lighting device with few or no lamp startup lighting failures, even when a xenon discharge lamp is near the end of its useful life. In the xenon discharge lamp, when a lamp voltage increases, from the ending point of the rush current supply time period, occurring upon starting a xenon discharge lamp lighting igniter, for a preset specified time T, the input power is increased in accordance with the lamp voltage increase amount, whereby constant power control is provided thereafter.

Xenon discharge lamp lighting device

A short arc discharge lamp in which the arc tube contains opposed cathode and anode electrodes with upholding parts that are inserted into a respective glass tube holding cylinder, and in which the glass tubes of the holding cylinders are secured in the side tubes at opposite sides of the arc tube by contracted areas, provides the peripheral surface of the holding cylinders with at least one section of reduced diameter to prevent the holding cylinders from moving, to prevent force from acting in a concentrated manner on the sealed areas and to prevent the lamp from being damaged when the lamp is shaken during transport or the like.

Short arc discharge lamp

Discharge lamp of the short arc type

An oxidation process for an article to be treated in which, by generating ozone with a high concentration, a high treatment rate is achieved. In particular, an oxygen-containing fluid is irradiated with a vacuum ultraviolet rays emitted from a dielectric barrier discharge lamp in which xenon gas is encapsulated, producing a photochemical reaction from which ozone and an activated oxygen result. By causing this ozone and activated oxygen to contact the surface of the article to be treated, the surface of the article is oxidized. An even higher treatment rate can be achieved by generating the activated oxygen with the simultaneous use of a far ultraviolet ray source, thereby increasing the activity of the activated oxygen. Advantageously, the oxidation of the article to be treated with the vacuum ultraviolet rays and far ultraviolet rays is performed in accordance with the relationship:

Growing community of inventors

Himeji, Japan

Takeo Matsushima