| 摘要 |
There are provided a lighting device with which it is possible to avoid the problem of heat generation in parts subjected to the concentrated energy of irradiating light even when the parts are irradiated with high-energy light from a light source, and a projection type of image display device equipped with this lighting device. This lighting device comprises a light source and a rotary reflecting member that is disposed at an angle to light incident from the light source. The rotary reflecting member has on its periphery a portion that reflects incident light (first region) and a portion that does not reflect (second region).
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