Ricoh Company, Ltd.

Toshiharu Murai

Kazuhiro Fujita

Tatsuya Takahashi

Takehiro Nishimori

Ikuo Maeda

Yasuyuki Takiguchi

Toshiaki Tokita

Koichiro Jinnai

Hiroyuki Sugimoto

Takahisa Koike

Kazumi Ishima

Takao Fukazawa

Koichi Kudo

Kenji Kameyama

Atsushi Takaura

Takanobu Osaka

Nobuyuki Baba

Kazuya Miyagaki

Kenji Namie

Sumiaki Aoki

Tadashi Ito

Takahiro Kado

Toshifumi Kato

Tadashi Itoh

Takashi Yano

Makoto Hirakawa

Michio Umezawa

Yumi Matsuki

Junichi Kitabayashi

Akio Matsubara

Minoru Ameyama

Kazunori Hoshi

Jun Kishiwada

Masaki Ninomiya

Yukiko Hirano

Kaoru Itoh

Atsushi Shibata

Osamu Adachi

Kasuhiro Fujita

Tatsuya Takabashi

A light source device comprising: a light source section which generates any one of blue light, red light, and green light; a phosphor which generates a fluorescence including the two colors other than the color of the light emitted from the light source section; a color-changing section which changes one of the two colors of the fluorescence emitted from the phosphor to another color regularly and irradiates it to the image-forming element; and a light path-switching section which switches a light path in which a fluorescence excited by the color light emitted from the light source section passes towards the color-changing section and a light path in which the color light emitted from the light source section passes towards the image-forming element regularly.

Light source device and projector including a phosphor and a color-changing section

Light source device that emits a plurality of color lights including a fluorescent light, and projector using the same

Light source device including a light source section to adjust brightness and projector using the same

A light source device includes a light source section that emits laser beam, a member reducing light quantity unevenness of the laser beam, a diffusion member that is provided in a traveling optical path of the laser beam between the light source section and the member reducing light quantity unevenness and diffuses the laser beam, a detection element that detects a physical characteristic of the diffusion member and outputs a state detecting signal, and an abnormal state determiner that determines an abnormal state of the diffusion member based on the state detecting signal.

Light source device including a magnetic or capacitance detecting sensor and an image projection apparatus including the light source device

A light irradiation device for emitting light of two or more components by laser light, which a laser light source emits, to an outside, includes a diffusion optical path change member configured to convert a first color component of the laser light into diffusion light and change an optical path of the first color component; a phosphor configured to generate fluorescence of a second color component different from the first color component based on the laser light, and change an optical path of the second color component; and an optical path switch member configured to switch between a first optical path for emitting the first color component to the outside and a second optical path for emitting the second color component to the outside. Light going straight at a light diffusion position of the diffusion optical path change member is not emitted to the outside.

Light irradiation device, and image display equipped with the same, for emitting light of two or more components by laser light

A light source device is disclosed. An embodiment of the light source device includes: an excitation light source configured to emit irradiation light of a color component to be used as excitation light and projection light; a fluorescent member disposed in an excitation light path and configured to generate fluorescence of a color component different from the color component of the irradiation light when being irradiated with the irradiation light; a light path merger unit configured to merge a fluorescence light path through which the fluorescence generated with irradiation of the irradiation light is delivered, and a projection light path through which the projection light is delivered; and a light path switch disk configured to switch the irradiation light between the excitation light path and the projection light path.

Light source device and projector using the same

An illumination apparatus includes: a light emitting unit that outputs light; a light condensing unit that condenses the light output from the light emitting unit; a diffusion unit that diffuses the light condensed by the light condensing unit; and a uniformizing optical system that receives the light diffused by the diffusion unit, uniformizes a brightness distribution thereof compared with that of the light being received, and outputs the resulting light.

Illumination apparatus, pattern irradiation device, and system

A light source device includes a light source section that emits laser light, a reflection and diffusion member that diffuses and reflects the laser light emitted from the light source section, and a cooler that cools the reflection and diffusion member. The cooler includes at least one of an axial fan, an electronic cooling element, and a heat pipe.

Light source device and image projector including the same

A light source device including: a light source section which generates any one of blue light, red light, and green light; a phosphor which generates a fluorescence including the two colors other than the color of the light emitted from the light source section; a color-changing section which changes one of the two colors of the fluorescence emitted from the phosphor to another color regularly and irradiates it to the image-forming element; and a light path-switching section which switches a light path in which a fluorescence excited by the color light emitted from the light source section passes towards the color-changing section and a light path in which the color light emitted from the light source section passes towards the image-forming element regularly.

An illumination device includes an excitation light source which emits excitation light, a wavelength converter which generates fluorescent light having a wavelength different from that of the excitation light through the excitation of the excitation light and a light path-splitting member including a first filter and a second filter arranged to alternately come across a light path of the excitation light, wherein the first filter reflects one of the excitation light and the fluorescent light and transmits the other of the excitation light and the fluorescent light, the second filter transmits light reflected by the first filter and reflects light transmitted through the first filter, and the wavelength converter is disposed in a reflection light path or a transmission light path of the excitation light.

Illumination device including a wavelength converter

A light source unit includes a light emitting element supporter to support a plurality of light emitting elements disposed with a dispersed pattern in a two-dimensional direction as a light emitting element assembly, and light emitted from the light emitting element assembly exits to a target; a light return member disposed at a position facing a light emitting side of the light emitting element assembly while setting a space with the light emitting element supporter, the light return member returning light emitted from the light emitting element assembly toward at an inner side of two dimensional direction of the light emitting element assembly, and a flow path of the cooling air to pass through cooling air supplied from an air supply unit into the space.

Light source unit and image projection apparatus including light source unit

A light source device includes a first light source to emit first light having a first wavelength range; a wavelength convertor, disposed on an optical path of the first light, to receive the first light to emit light having other wavelength range different from the first wavelength range; a cyclical movement unit to cyclically move the wavelength convertor while crossing the optical path of the first light; optical parts to define an optical path of the first light, and an optical path of the light emitted from the wavelength convertor; a detector to detect a cyclic movement condition of the cyclical movement unit; and a received light quantity reducing unit to reduce light quantity of the first light received by the wavelength convertor when a cyclic movement condition detected by the detector satisfies an abnormal condition while outputting the first light or the light having other wavelength range to outside.

Light source device, and image projection apparatus employing light source device

A light source device includes: a first light emitting unit including a light emitting element that emits light having a predetermined wavelength range; a second light emitting unit including a wavelength conversion member that receives the light from the light emitting element and emits light having a different wavelength range different than the predetermined wavelength range; an optical unit configured to define a path of the light emitted from the light emitting element and a path of the light emitted from the wavelength conversion member; an air blowing unit configured to generate a cooling air; and a passage forming member configured to form a passage through which the cooling air flows, the passage being in contact with both of the first light emitting unit and the second light emitting unit.

Light source device including passage forming member and image projecting apparatus having the same

An illumination light source device includes a reflection-transmission wheel provided on a light-path from an excitation light source and having a transmission region that transmits an excitation light and a reflection region reflecting the excitation light, a fluorescent wheel provided on at least one of the reflection light-path and the transmission light-path and having a fluorescent body emitting fluorescence when excited by the excitation light, and a control section turning-on the excitation light source while the boundary of the transmission region and the reflection region traverses the light-path, in order to provide an illumination light source device capable of preventing a deterioration of the fluorescent body, whereby improving a color reproducibility by use of the color mixture occurred at the boundary region between the transmission light-path and the reflection light-path effectively and improving the brightness of image.

Illumination light source device including a reflecting-transmitting element, projection device including the illumination light source device and method to control the projection device

A light source unit emitting a light on an optical axis includes a first light emitter to emit a light in a certain wavelength band, a second light emitter to emit a light in a wavelength band different from that of the first light emitter, a third light emitter to emit a light in a wavelength band different from those of the first and second light emitters, a lighting path through which the lights from the first, second, and third light emitters are guided to propagate on the optical axis and into which the light from the third light emitter is joined at a hindmost position in a traveling direction on the optical axis, and an optical adjuster to exert an optical effect on the light from the third light emitter and not to exert an optical effect on the light rays from the first and second light emitters.

Light source unit and projector incorporating the same

Growing community of inventors

Kanagawa, Japan

Toshiharu Murai