Light source reflective device

Abstract

The light source reflecting device includes one curved reflecting surface to reflect the light beam from the light source in the focus of the curved reflecting surface, and one semi-spherical reflecting surface to reflect the light beam from the light source in the focus of the semi-spherical reflecting surface. The focus of the curved reflecting surface and the focus of the semi-spherical reflecting surface are in the same position, so that the light beam from the light source in the center of the semi-spherical reflecting surface is reflected by the semi-spherical reflecting surface to pass through the center and to irradiate the curved reflecting surface. All the light beams from the light source will pass through the focus and will be output from the curved reflecting surface, and this results in light beam with very small light converging angle and light converging area.

Description

technical field [0001] The invention relates to a light source reflection device, in particular to a reflection device capable of making reflected light have a very small light-gathering angle and a very small light-gathering area. Background technique [0002] figure 1 A cross-sectional view of a conventional light source reflection device 100 is shown. Such as figure 1 As shown, the reflective device 100 includes a curved reflective surface 101 , wherein a point 102 represents a focal point of the curved reflective surface 101 . Generally speaking, the curved reflective surface 101 is an ellipse (Ellipsoid) or a paraboloid (Paraboloid). When a light source 103 with an arc gap (Arc gap) is placed at the point 102 to make it emit light, the curved reflective surface 101 of the ellipse reflects the light emitted by the light source 103 and gathers it on another focal point 104 of the ellipse, wherein The angle θ is defined as the focusing angle, and Φd is defined as the d...

AI Technical Summary

Problems solved by technology

[0003] In the current application of digital projectors, when using the above-mentioned reflecting device, because its light-gathering angle is usually 60° or greater, if it is to improve its optical lighting efficiency, the usual way is to increase the light-gathering angle, although it can effectively More light is collected, but an excessively high light-gathering angle also seriously affects the characteristics of the optical film, making the output image color error or poor contrast

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