Ushio Denki Kabushiki Kaisha

Takigen Manufacturing Co. Ltd.

Yuichi Miura

Masashi Okamoto

Takanori Samejima

Mikio Shimizu

Takahiro Toma

Hideki Nara

Kiyoyuki Kabuki

Takayuki Kozakura

Shohei Tsukamoto

Hirotaka Yamada

A light source device includes at least one semiconductor laser and a laser-excited light source. The laser-excited light source has a phosphor excited by the semiconductor laser(s), and an optical system for extracting fluorescence emitted from the phosphor. The light source device also includes a plurality of LED light sources for emitting light having wavelengths different from a wavelength of the fluorescence. The light source device also includes a composite optical system for synthesizing the fluorescence from the laser-excited light source with the light from the LED light sources, and emitting the synthesized light from a light emitting portion. The LED light sources include an LED light source configured to emit light in an ultraviolet range. The LED light source configured to emit the light in the ultraviolet range is disposed at a position farther from the laser-excited light source than the remaining LED light source(s).

Light source device including laser-excited light source

A mirror unit includes a plurality of reflective mirrors, a mirror holder on which the plurality of reflective mirrors are disposed and an adhesive member to bond and fix the reflective mirrors to the mirror holder. The mirror holder has a contact area where the reflective mirrors are to be in contact and a step in a direction away from the reflective mirror with respect to the contact area. The step has an adhesive fixing area on which an adhesive member is mounted.

Mirror unit and light source device having the same

The light source device includes an external resonator type semiconductor laser light source that includes a wavelength conversion element and emits light having a wavelength converted by the wavelength conversion element from a first light emission region and a second light emission region different from the first light emission region, a first optical waveguide and a second optical waveguide that each include an incident surface having a circular shape and emit light from light emission surfaces to a same irradiation surface, a first condensing optical system that condenses a plurality of first light bundle of rays emitted from the first light emission region on the incident surface of the first optical waveguide; and a second condensing optical system that condenses a plurality of second light bundle of rays emitted from the second light emission region on the incident surface of the second optical waveguide.

Light source device

A light source unit including: a plurality of elemental light sources each including a light emitting element and a drive circuit; a control circuit configured to control the drive circuit; and a luminous flux characteristic measurement section configured to measure received output luminous fluxes to generate luminous flux chromaticity-intensity correlation data. The control circuit generates a single-color color-phase indicating value, based on the luminous flux chromaticity-intensity correlation data. The control circuit determines a ratio of intensity of additional light to intensity of main component light to allow the single-color color-phase indicating value to become equal to a target value thereof, and generates an integrated color-phase indicating value, based on the luminous flux chromaticity-intensity correlation data. The control circuit performs feedback control on the drive circuits to allow a difference between the integrated color-phase indicating value and a target value thereof to be small.

Light source unit and projector

A light source unit includes: a plurality of elemental light sources each including one or more light emitting elements and one or more drive circuits; a control circuit; and a plurality of color band light characteristic measurement sections each configured to receive light to generate color band light characteristic measurement data. A plurality of the light emitting elements in the elemental light sources includes light emitting elements different in wavelength band of emission wavelength from one another. The color band light characteristic measurement sections are provided corresponding to a plurality of the wavelength bands. One or more of the color band light characteristic measurement sections include a first light intensity measurement section and a second light intensity measurement section. The control circuit generates light intensity indicating values and wavelength deviation indicating values, generates color phase indicating values, and performs first feedback control on the drive circuits.

Provided are a coherent light source apparatus and a projector. A first light emission region is formed on basis of a coherent light source; a first optical system projects light derived from a first light emission region to form a second light emission region; a light deflection section deflects a bundle of rays in vicinity of the second light emission region; a second optical system downstream of the light deflection section; and a light mixing section downstream of the second optical system that mixes components of angles and positions of rays incident on an incident end. The second optical system forms an image conjugate to the first light emission region and a third light emission region substantially conjugate to an exit pupil of the first optical system. The light deflection section continues to cause a direction in which the bundle of rays is deflected to be continuously changed.

Coherent light source device and projector

A coherent light source apparatus includes a coherent light source, a first optical system, a light deflection unit, a second optical system and a light mixing unit disposed in that order. The coherent light source forms a first light emission region, and light projected therefrom forms a second light emission region near the light deflection unit, which deflects light flux from the second light emission region. The second optical system forms a third light emission region which is conjugate to the second light emission region near an input end of the light mixing unit, which mixes angle and a position components of incident light. The light deflection unit is configured to continuously changing a direction in which the light flux is deflected, thereby reducing speckling in light emitted from the light mixing unit.

Coherent light source apparatus and projector

A coherent light source apparatus comprises a first optical system, which has a first light emission region formed by a coherent light source, and which projects light from the first light emission region to form a second light emission region, a light deflection unit which deflects light flux in connection with formation of the second light emission region; a second optical system, which forms a third light emission region in response to the light flux which has been deflected by the light deflection unit, a light mixing unit for mixing a component of an incident light angle and that of a position thereof, and a light deflection unit drive circuit for receiving a periodic optical deflection synchronization signal, thereby driving the light deflection unit, wherein the light deflection unit operates to continuously change a direction in which the light flux is deflected while synchronizing with the optical deflection synchronization signal.

Light source apparatus and projector

A laser light source apparatus comprises a laser light source that emits laser light; a prism with one optical flat face, through which the laser light from the laser light source passes, that is perpendicular to an optical path of the laser light; and a vibration driving device that vibrates the prism to move the prism parallel to a direction in which an optical path length of the laser light in the prism changes, along a flat face located in the other optical flat face that does not intersect perpendicularly with the optical path of the laser light in the prism.

Laser light source apparatus

A assembly is improved in rigidity to sufficiently bear the stress imposed thereon under a tensile force exerted by a strap 27. In the assembly, the strap winding shaft 7 is constructed of a pair of the main-shaft segments 7a, 7b and a core plate segment 8; and, the strap 27 has its first one 27a of its opposite end portions 27a, 27b inserted into both the first slots 24 (which extends the radial direction of the main-shaft segments 7a, 7b) and the second slot 25 (which extends in the thickness direction of the core plate segment 8), and the strap is wound on the strap winding shaft 7.

Growing community of inventors

Hyogo, Japan

Yuichi Miura