Ushio Denki Kabushiki Kaisha

Fumihiko Oda

Masashi Okamoto

Takanori Samejima

Kengo Moriyasu

A light source unit includes: elemental light sources each including light emitting elements and drive circuits; an integrated control circuit that controls the drive circuits; and band optical characteristic acquisition sections that receive light of an amount correlated with a total light amount of output luminous fluxes to acquire light emitting intensity indicating values and wavelength deviation indicating values. The integrated control circuit at least intermittently acquires band optical characteristic acquisition data to generate the light emitting intensity indicating values and the wavelength deviation indicating values. The integrated control circuit holds light emitting intensity indicating value target variation information, and determines the variation of the light emitting intensity indicating values, in accordance with the light emitting intensity indicating value target variation information belonging to one appearance mode of the wavelength deviation indicating values assumed on a basis of an actual mode of the generated wavelength deviation indicating values.

Light source unit and projector

A light source apparatus comprises a beam flux conversion optical system for making all the light emitting areas conjugate to one geometrical-optical output image, all the solid light emitting elements being in series connected to each other and fixed to a heat sink to be insulated to one another, circuits on the input and output sides of an electric supply circuit being not insulated, the electric supply circuit including an interface circuit for receiving a modulation amount specifying signal from a host circuit, wherein a ratio of ON time to a switching cycle of the switch element is controlled in a feedback manner so that a difference between current values indicated by the output current signal and a target current signal may become small, and the interface circuit generating analog quantity correlated to the amount of modulation specified by a modulation amount specifying signal through a data insulation transmission unit.

Light source apparatus and projector

To avoid accelerated progression of deterioration of a semiconductor laser, an LED, and the like to extend their lives while adjusting a balance of a plurality of colors, such as R, G, and B, by feedback control, a deterioration controllable monochromatic light source module is configured to: calculate a substantial upper limit Iu, determine an operation coefficient hx based on a deterioration coefficient dx, perform feedback control of the output current Ix of each drive circuit, and output a light intensity detection signal to the outside. An integrating control circuit calculates a monochromatic light intensity sum &#x3c3; by a sum of light intensity detection signals from the monochromatic light source modules belonging to the same wavelength band and determines a light intensity target signal so that a ratio of the monochromatic light intensity sum &#x3c3; to the monochromatic light source modules in different wavelength bands is a predetermined ratio.

Light source device and projector

In an excimer lamp, rare gas and fluorine are enclosed inside a translucent ceramics arc tube. External electrodes are formed on an outer surface of the arc tube. A condition of 2.5+0.5 log(C)&#x2266;G&#x2266;14&#x2212;4 log(C) is satisfied in the case of 0.1&#x2266;C&#x2266;10, wherein G (mm) is a discharge gap in the arc tube and C(%) is molar concentration of the fluorine.

Escimer lamp having discharge gap controlled by fluorine concentration

A excimer lamp comprises an electric discharge container in which a sealing member is provided between a lid member and an arc tube which does not contain silica, and a pair of external electrodes which are separately provided on an outer surface of the arc tube, wherein rare gas and a fluoride is enclosed in the electric discharge container, and the fluoride is sulfur hexafluoride, carbon tetrafluoride, or nitrogen trifluoride.

Growing community of inventors

Hyogo, Japan

Fumihiko Oda