Light source device and video image displaying apparatus using the same

Abstract

A light source apparatus having, in spite of its simple and compact construction, enhanced efficiency of condensing light in a predetermined small diameter region. The light source apparatus has a light emitting tube (20) with a pair of main electrodes (21, 22) and has a reflector (30) for reflecting light emitted from the light emitting tube (20). The electrode axis O1 of the main electrodes (21, 22) intersects with the optical axis LA of the emitted light. In the reflector (30) are formed a first reflector section (31) and a second reflector section (32). The first reflector section (31) has a spherical surface with its center at a light emitting point L0 of the light emitting tube (20), and the second reflector section (32) has a curved surface different from that of the first reflector section (31). The reflector (30) also has a light condensing body (40) for condensing light that is emitted from the light emitting tube (20) to places other than the second reflector section (32) and irradiating the condensed light to a predetermined direction or region.

Description

technical field [0001] The present invention relates to a light source device having a reflection mirror for reflecting light emitted from a light emitting tube, and an image display device using the light source device. Background technique [0002] The background art of the present invention will be described with reference to FIGS. 17 to 23 . Fig. 17 (a), (b) is a comparative explanatory diagram of the arrangement direction of the luminous tubes, Fig. 18 is a horizontal cross-sectional view showing the schematic structure of the optical axis parallel arrangement type light source device, and Fig. 19 is a view showing the light source shown in Fig. Horizontal cross-sectional view of the state of the emitted light emitted from the light-emitting point of the axis-parallel-arranged light source device. [0003] Conventionally, arc tubes such as metal halide lamps, xenon short-arc lamps, and high-pressure mercury lamps that emit light by arc discharge have been used as light...

AI Technical Summary

Problems solved by technology

[0033] However, in the optical axis perpendicular arrangement type light source device shown as the first prior art, when the reflective surface of the reflector is formed as an aspheric surface such as an elliptical surface or a hyperboloid surface, there is no light emitted from the arc tube. Components irradiated on the aspheric reflective surface of the reflector cannot reach the desired focusing point or area, reducing the light collection efficiency

[0034] In addition, in the optical axis perpendicular arrangement type light source device shown as the second prior art, the reflective surface of the reflector behind the arc tube is formed as a concentric circular surface when viewed from the optical axis, and the reflective surface is formed as a concentric circular surface when viewed from the optical axis. In the case where a light-condensing element such as a lens is arranged in front of the light-emitting tube, when the light-emitting light from the light-emitting tube and the reflective surface formed as the concentric circular surface is collected by the light-condensing element, the collection angle of the light is limited. Therefore, In this case, there will also be a problem that the light collection efficiency will decrease.

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