| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact projection type display device. SOLUTION: A projection lens 4 is provided with first, second and third lens groups respectively having negative, positive and the positive refracting power in turn from a screen 5 side and constituted so as to satisfy three conditions being 1.8<D1/f<3.0, 1.1<f2/f3<1.6 and 1.5<|f1 /f<2.3 (D1 is a distance between the first and the second lens groups and f1, f2, f3 and (f) are the focal distances of the first, the second and the third lens groups and the whole system). Besides, a mirror 41 is arranged between the first and the second lens groups. Then, projection light raised by the mirror 41 incorporated in the lens 4 is made incident on a screen 5 by the other mirror 160. A projector 300 is installed in a left half area from the center of the screen 5.
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