Patent ID: 9366423
Filing Date: 2016-06-14
CPC Classification: F21K,F21S,F21V,F21W,F21Y

Claim Text:
1. An LED illumination device comprising: an illumination section which has a substrate with a plurality of LED elements mounted thereon, and a mounting plate which supports the substrate; and a cooling section which supports and cools the mounting plate, the cooling section comprising: a cooling cylinder, which includes a cylindrical body with one longitudinal end and an other longitudinal end, and the one longitudinal end is closed and the other longitudinal end is open, and a hollow interconnect component is attached to the other longitudinal end of the cylindrical body; and a coolant liquid filled within the cooling cylinder, the mounting plate having one surface when viewed in a direction of thickness of the mounting plate configured as a mounting surface on which the substrate is attached, and the other surface when viewed in the direction of thickness of the mounting plate configured as a rear face, the mounting plate having and the plurality of LED elements being disposed so as to fall within the contour of the recesses, when viewed in the direction of the thickness of the mounting plate; wherein the mounting plate is attached, in such a manner that the rear surface thereof is directed toward the inside of the interconnect component, to one end of the interconnect component, the one end being opposed to a location thereof with which the interconnect component is attached to the other longitudinal end of the cylindrical body, thereby to close the one end of the interconnect component, wherein an area of a location of the rear surface, the location being positioned inside the one end of the interconnect component, is greater than an area of a cross section of an inside space of the cylindrical body, the cross section being taken along a plane perpendicular to an axial direction of the cylindrical body, wherein an inner space of the cooling cylinder includes a columnar space that is formed inside the cylindrical body and straightly extends while keeping a constant cross-sectional area, and a first space that is formed inside the interconnect component, connected to the columnar space, and has a cross-sectional area that gradually increases with distance as closer to the rear surface, the cross-sectional area being taken along a plane in parallel with the rear surface, and wherein an entire region of the rear surface of the mounting plate positioned within the cooling cylinder is an entire area of the mounting plate positioned within the first space.