Seiko Epson Corporation

Wataru Yasumatsu

Koichi Akiyama

Koya Shiratori

Kunihiko Yano

Tetsuo Shimizu

Tomohiro Yokoo

Toshiaki Hashizume

Kunihiko Takagi

Akira Egawa

Hidefumi Sakata

Shunji Kamijima

Shinichi Yotsuya

Takashi Endo

Norio Nakamura

Osamu Arakawa

Tomoko Akagawa

Yuta Tokuno

Takashi Gokuden

Soma Toda

A wavelength conversion element according to the present disclosure includes: a wavelength conversion layer; a first substrate; a second substrate; a first intermediate layer; and a second intermediate layer. A linear expansion coefficient of the first substrate is smaller than a linear expansion coefficient of the wavelength conversion layer. The linear expansion coefficient of the wavelength conversion layer is smaller than a linear expansion coefficient of the second substrate. The linear expansion coefficient of the first substrate is smaller than the linear expansion coefficient of the second substrate. A thermal conductivity of the first substrate is larger than a thermal conductivity of the wavelength conversion layer. A thermal conductivity of the second substrate is larger than the thermal conductivity of the wavelength conversion layer.

Wavelength conversion element, light source device, projector, and method of manufacturing wavelength conversion element

A wavelength conversion element according to the present disclosure includes a substrate, a dichroic layer provided to a first surface of the substrate, an intermediate layer disposed so as to be opposed to the substrate via the dichroic layer, and a wavelength conversion layer disposed so as to be opposed to the dichroic layer via the intermediate layer, and configured to convert light in a first wavelength band into light in a second wavelength band. The dichroic layer has two or more types of refractive index layers having respective refractive indexes different from each other.

A light source device according to the present disclosure includes a light source section, a first polarization split element for transmitting first light with a first polarization direction from the light source section and reflecting the first light with a second polarization direction, a first retardation element, a second polarization split element for reflecting the first light in the second polarization direction from the first retardation element, a second retardation element, and a light conversion device having a diffusion element for diffusing the first light from the second retardation element, a first wavelength conversion element for performing wavelength conversion on the first light to emit second light, and a substrate.

Light source device, projector, and display device

Alight source device according to the present disclosure includes a light source section configured to emit first light in a first wavelength band, a first optical element configured to collect the first light emitted from the light source section, a second optical element having a first plane of incidence and a first exit surface, and a wavelength conversion element having a second plane of incidence and a second exit surface, and configured to convert the first light entering the wavelength conversion element through the second plane of incidence into second light having a second wavelength band, wherein the second optical element and the wavelength conversion element are disposed in a state in which the first exit surface and the second plane of incidence are opposed to each other at a distance from each other, and the second plane of incidence is larger in size than the first exit surface.

Light source device and projector

A light source apparatus according to the present disclosure includes a light source section, a first polarization separator that transmits in a first polarization component of the first light and reflects a second polarization component of the first light, a second polarization separator that reflects the first polarization component, a diffuser that diffuses the second polarization component and causes the diffused second polarization component, a first wavelength converter that converts the wavelength of the first polarization component into second light, and a second wavelength converter that is disposed in a position shifted in a fifth direction from a placement plane where the first polarization separator and the second polarization separator are placed, converts the wavelength of the excitation light into third light, and the second polarization separator transmits the first polarization component of the second light and reflects the second polarization component of the second light.

Light source apparatus and projector

A light source device according to the present disclosure includes a light source section, a first light separation element for transmitting a part of first light entering the first light separation element irrespective of a polarization component, and reflecting another part of the first light irrespective of a polarization component, a second light separation element for reflecting a part of the first light entering the second light separation element, a diffusion element for diffusing and emitting another part of the first light entering the diffusion element, and a wavelength conversion element for performing wavelength conversion on a part of the first light entering the wavelength conversion element to emit second light, wherein the second light separation element transmits a first polarization component with respect to the second light, and reflects a second polarization component.

A wavelength converter according to the present disclosure includes a wavelength conversion layer that has a first surface and a second surface different from the first surface and converts excitation light that belongs to a first wavelength band into fluorescence that belongs to a second wavelength band different from the first wavelength band, a first light transmissive member that has a third surface on which the excitation light is incident and a fourth surface different from the third surface and transmits at least the excitation light, and a first layer provided between the first surface of the wavelength conversion layer and the fourth surface of the first light transmissive member, which are surfaces facing each other. The refractive index of the first light transmissive member is greater than the refractive index of the wavelength conversion layer, and the first layer transmits the excitation light and reflects the fluorescence.

Wavelength converter, light source apparatus, and projector

An illuminator includes a first light source unit that includes a first light source region, a second light source unit, and a light ray flux adjusting system. The first light source region outputs parallelized first color light. The first light source unit outputs first light containing the first color light. The second light source unit outputs parallelized second light thicker than the first light. The second light is formed of second color light having a color different from the color of the first color light. The light ray flux adjusting system is in the optical path of the first light. The difference in thickness between the first light and the second light on the downstream of the light ray flux adjusting system is smaller than the difference in thickness between the first light and the second light on the upstream of the light ray flux adjusting system.

Illuminator and projector

A light source apparatus according to an aspect of the present disclosure includes a substrate having a first surface, a frame, a lid with which the frame is provided, a light emitter that is accommodated in an accommodation space, a wavelength converter that is provided at the substrate, is accommodated in the accommodation space, converts first light emitted from the light emitter into second light having a wavelength different from the wavelength of the first light, and outputs the second light, and a first optical film that is provided in the light path between the light emitter and the wavelength converter, transmits one of the first light and the second light, and reflects the other one of the first light and the second light, and the light emitter emits the first light in such a way that the chief ray of the first light travels along the first surface.

A wavelength conversion element includes a wavelength conversion layer which has a first face on which an excitation light is incident and a second face facing the first face, a first layer which is provided facing the second face and contains a first inorganic oxide, a second layer which is provided facing the first layer and contains a first metal or a second inorganic oxide that is different from the first inorganic oxide, and a third layer which is provided facing the second layer, contains either silver or aluminum, and reflects the excitation light or a light obtained by wavelength conversion of the excitation light by the wavelength conversion layer.

Wavelength conversion element, method for producing wavelength conversion element, light source device, and projector

A light source unit includes one or more light source rows that include a first light source row including light emitting devices. The light emitting devices of the first light source rows are arranged at non-uniform intervals. An illuminator includes a light source unit for emitting a bundle of light beams, a first fly-eye lens including lenslets, a second fly-eye lens, and a condenser lens. The light source unit includes one or more light source rows each including light emitting devices. The principal rays of first light beams outputted from a first light source row out of the one or more light source rows enter different lenslets out of the lenslets. A positional relationship between a principal ray of each of the first light beams and the optical axis of the lenslet which the principal ray enters is aperiodic over the first light source row.

Light source unit, illuminator, and projector

An illumination device of the invention includes a light source unit including light emitting devices having light emission surfaces, a collimating system having collimating lenses provided to respectively correspond to the light emitting devices of the light source unit, into which lights from the respective light emitting devices enter, a collecting lens into which the lights output from the collimating lenses enter, and a rod lens having a light incident end surface into which the light collected by the collecting lens enters. The light source unit and the collimating system are adapted so that a principal ray of the light output from the light emission surface corresponding to a part of the light emitting devices of the light source unit may enter a position separated from an optical axis of the collimating lens corresponding to the part of the light emitting devices of the light source unit.

Illumination device and projector

A light source device includes a light source, a homogenizer optical system provided with a first multi-lens array having a plurality of first lenses which light emitted from the light source enters, and a second multi-lens array having a plurality of second lenses each of which the light having been transmitted through corresponding one of the first lenses enters, and adapted to homogenize the light emitted from the light source, a light intensity control element adapted to control light intensity of the light emitted from the homogenizer optical system, a light collection optical system adapted to converge the light having been transmitted through the light intensity control element, and a diffusion element which the light converged by the light collection optical system enters.

An illuminator includes a light source apparatus that outputs first light that belongs to a first wavelength band, an optical element including a dichroic film and a first retardation element, a reflection element, a light dividing element including a plurality of lenses, and a polarization conversion element. A first component of the first light outputted from the light source apparatus passes through the dichroic film and the first retardation element in this order, is reflected off the reflection element, passes through the first retardation element, and is further reflected off the dichroic film. The first component reflected off the dichroic film passes through the light dividing element and is incident on the polarization conversion element.

A light source device includes a light emitting element adapted to emit light having a first polarization direction and a first wavelength, a polarization separation element adapted to transmit either one of the light having the first polarization direction and the first wavelength and light having a second polarization direction and the first wavelength, and reflect the other, and transmit or reflect light having a second wavelength to emit the light having the second wavelength toward a same direction as a direction in which the light having the second polarization direction and the first wavelength is emitted, a wavelength conversion element adapted to convert the light having the first wavelength into the light having the second wavelength, and a diffusion optical system disposed on a light path between the polarization separation element and the wavelength conversion element. The diffusion optical system includes a diffusion section and a light separation section.

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Azumino, Japan

Wataru Yasumatsu