| 摘要 |
The present invention relates to a rear projection type image display device comprising projection lenses ( 2, 3 ) for projecting an image displayed on an image display element onto a transmission type screen ( 6 ) on a larger scale, an optical path turn-back mirror ( 7 ) for turning back halfway a light beam projected from the projection lenses, and a drive circuit for displaying an image on the image display element, that are fixedly housed within a housing ( 5 ). When a diagonal size of the transmission type screen ( 6 ), the depth of the housing ( 5 ), and the length from a lower end of the screen ( 6 ) to a lower end of the housing ( 5 ), are assumed to be SS (inch), D (inch), and L (inch), respectively, the following conditions are satisfied: <?in-line-formulae description="In-line Formulae" end="lead"?>SS >40, D<=SS/3.0, L<=SS/10.9.<?in-line-formulae description="In-line Formulae" end="tail"?>
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