An illumination device includes a plurality of excitation light sources; a fluorescent plate for receiving the excitation light and emitting fluorescent light; and an optical system for causing excitation light from each of the plurality of excitation light sources to be incident on the fluorescent plate, the optical system includes a plurality of reflection surfaces for redirecting the output from the respective excitation light sources into a divergent light pattern.

An illumination device includes a plurality of excitation light sources; a fluorescent plate for receiving the excitation light and emitting fluorescent light; and an optical system for causing excitation light from each of the plurality of excitation light sources to be incident on the fluorescent plate, the optical system includes a plurality of reflection surfaces for redirecting the output from the respective excitation light sources into a divergent light pattern.

Provided are a fluorescent member that has high thermal conductivity, can prevent an increase in temperature of a fluorescent layer, and can maintain their fluorescence performance even during irradiation with high-intensity source light, and a light-emitting device using the fluorescent member. A transmissive-type wavelength conversion member 100 converts light with a wavelength in a specific range to light with a different wavelength and allows light passing through the wavelength conversion member to be used as illuminating light. The wavelength conversion member 100 includes: a substrate 110 that is formed of an inorganic material and allows light to pass through; and a fluorescent material layer 120 disposed on the substrate 110. The fluorescent material layer 120 includes fluorescent material particles 122 that absorb light and emit converted light and a light-transmitting ceramic 121 that bonds the fluorescent material particles 122 together. The ratio of the thickness of the fluorescent material layer 120 to the average particle diameter of the fluorescent material particles 122 is less than 30.

The invention describes a laser-based light source comprising: a laser being arranged to emit laser light, a ceramic light converter being adapted to convert a part of the laser light to converted light, a light outcoupling dome with a base area of at least 2.5*10.sup.5 m.sup.2 comprising a material with a thermal conductivity of more than 25 W/(m*K), wherein a bonding area of the light outcoupling dome of at least 8*10.sup.3 m.sup.2 is adhesive-free bonded to the ceramic light converter, wherein the base area is at least 25 times larger than an area of the ceramic light converter being arranged to be illuminated by the laser, a substrate thermally coupled to the light outcoupling dome,
wherein the light outcoupling dome comprises a reflective structure being arranged such that converted light emitted with an angle larger than =65 with respect to an optical axis of the light outcoupling dome is reflected back in the direction of the ceramic light converter.

The invention further relates to a vehicle headlight comprising such a laser-based light source.

The invention describes a laser-based light source comprising: a laser being arranged to emit laser light, a ceramic light converter being adapted to convert a part of the laser light to converted light, a light outcoupling dome with a base area of at least 2.5*10.sup.5 m.sup.2 comprising a material with a thermal conductivity of more than 25 W/(m*K), wherein a bonding area of the light outcoupling dome of at least 8*10.sup.3 m.sup.2 is adhesive-free bonded to the ceramic light converter, wherein the base area is at least 25 times larger than an area of the ceramic light converter being arranged to be illuminated by the laser, a substrate thermally coupled to the light outcoupling dome,
wherein the light outcoupling dome comprises a reflective structure being arranged such that converted light emitted with an angle larger than =65 with respect to an optical axis of the light outcoupling dome is reflected back in the direction of the ceramic light converter.

The invention further relates to a vehicle headlight comprising such a laser-based light source.

An image display apparatus according to an embodiment of the present technology includes a base, a light emission body, a dichroic film, and a heat conduction member. The light emission body is provided on the base, and emits visible light by being excited by excitation light. The dichroic film reflects at least a part of the visible light emitted from the light emission body. The heat conduction member is provided on the base, and diffuses heat transmitted from the light emission body to the base.

A floodlight device comprises a light-emitting element that emits laser light, a fluorescent element on which light emitted from the light-emitting element is incident and which converts at least a portion of said light into fluorescent light that is output therefrom, a first optical system on which light output from the fluorescent element is incident, and a second optical system on which light exiting the first optical system is incident and which causes said light to be made into a collimated light beam that is made to exit therefrom so as to be directed toward the exterior of the device, a divergence angle of light incident on the second optical system is greater than a divergence angle of light incident on the first optical system.

A light emitting device includes: a laser light source which emits a laser beam; a fluorescent member which emits fluorescence when irradiated with the laser beam emitted from the laser light source; and a light separation element on which the laser beam and the fluorescence are incident and which causes the laser beam and the fluorescence to travel in mutually different directions.

A light emitting device of the present invention includes a light-emitting section for generating fluorescence by receiving a laser beam, and a light irradiation unit for irradiating a light irradiated surface of the light emitting section with a laser beam that increases regularly in beam diameter in a direction in which the laser beam travels.

The present invention relates to a light emitting apparatus comprising, an element (104) arranged to convert light of a first wavelength (110) into light of a second wavelength (112), emit the light of the second wavelength (112), and to reflect light of the first wavelength (110), a reflector (106) arranged to reflect light of the first wavelength (110), and transmit light of the second wavelength (112), a light source (102) emitting light of the first wavelength (110) on the reflector (106) such that the reflected light of the first wavelength (110) is directed towards the element (104), a lens (108) arranged to focus light of the first wavelength (110) reflected by the reflector (106) onto the element (104), and to collect light emitted and reflected from the element (104), wherein the element (104) is arranged to emit light of the second wavelength (112) with an angular distribution (116) within a collection angle of the lens (108), wherein the element (104) is further arranged to reflect light of the first wavelength (110) with an angular distribution (118) substantially within the collection angle of the lens (108) and with an intensity distribution such that a portion (120) of the light of the first wavelength (110) that is reflected with an angular distribution outside a region (122) covered by the reflector (106) is larger than a portion (124) of the light of the first wavelength (110) that is reflected with an angular distribution within the region (122) covered by the reflector (106).