| 摘要 |
PROBLEM TO BE SOLVED: To provide an image display device which is thinned because its lower part is made short, whose incident angle on a screen is shallow and which is excellent in terms of performance and cost. SOLUTION: In the image display device 108 which enlarges and projects an original image on a light valve 101 onto the screen 106 by an enlarging and projecting means 104, the enlarging and projecting means is an image enlarging optical system 110 constituted of a transmission refraction type optical system 111 and a reflection type optical system 112. The reflection type optical system comprises an optical system having: a first reflection type optical device 113 reflecting and deflecting luminous flux emitted from the transmission refraction type optical system in the vertical direction of a housing; a second reflection type optical device 114 arranged at a position where it is opposed to the first reflection type optical device in the vertical direction of the screen while putting the center of the screen in between and possessing a reflection surface having negative power; and a third reflection type optical device 115 arranged to be opposed to a screen surface on the back of the housing. An image is formed on the screen by reflecting the luminous flux on the first, the second and the third reflection type optical devices in this order. COPYRIGHT: (C)2007,JPO&INPIT
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