Patent ID: 9124816
Filing Date: 2015-09-01
Classification: F21K,G02B,G03B,H04N

Abstract:
1. An illumination unit comprising: one or more light sources each including a solid-state light-emitting device having a light emission region configured of one or more light-emission spots; one or more traveling-direction angle conversion device each converting a traveling-direction-angle of light entering from the solid-state light-emitting device; and an integrator including a first fly-eye lens having cells which receive light from the traveling-direction angle conversion device and a second fly-eye lens having cells which receive light from the first fly-eye lens, the integrator uniformalizing illumination distribution in a predetermined illumination area which is to be illuminated by light from the traveling-direction angle conversion device, wherein an optical system configured with the traveling-direction angle conversion device and the first and second fly-eye lenses has an optical magnification which allows each of light source images to have a size not exceeding a size of the cell in the second fly-eye lens, the light source images being formed on the second fly-eye lens by the respective cells in the first fly-eye lens, wherein the solid-state light-emitting device is configured of a single chip which emits light in a predetermined wavelength range or is configured of a plurality of chips which emit light in the same wavelength range or different wavelength ranges, wherein the optical magnification of the optical system satisfies the following expression: where h is the size of the light source image, P is a size of the light emission region, the size being equal to a size of a light-emission spot of the chip when the solid-state light-emitting device is configured of one chip, and the size being equal to a size of an enclosure which encloses light-emission spots of all the chips with a minimum inner area when the solid-state light-emitting device is configured of a plurality of chips, m is the optical magnification of the optical system, and h wherein the traveling-direction angle conversion device converts a traveling-direction angle of light entering from the solid-state light-emitting device to be equal to or close to a traveling-direction angle of parallelized light, and a focal length f wherein a ratio of a horizontal magnification factor to a vertical magnification factor of the traveling-direction angle conversion device is equal to an inverse of the aspect ratio of each cell in the second fly-eye lens.