Patent ID: 8189123
Filing Date: 2012-05-29
Classification: F21K,F21V,G02B,G03B,H01L,H04N

Abstract:
1. A projection apparatus with a light modulator having a light receiving region with a cross-sectional area to be illuminated of the size A M and a maximum acceptance angle α for incident light, and at least one light source by means of which, during its operation, a light cone is produced for illuminating said cross-sectional area of said light receiving region and which comprises a number N of LED chips having a radiation decoupling area of the size A D and a maximum radiation angle β, characterized in that at least one optical element is disposed in a light path between said LED chips and said light modulator, a gap filled with a gas is present in the light path between said LED chips and said optical element, and 0.7·(A