| 摘要 |
PROBLEM TO BE SOLVED: To provide a projection type display device capable of coping with projection distances in a wide range by one. SOLUTION: The projection type display device 10 projecting a display image through an optical system 30 includes lens groups 40, 50 and 60 prepared for each of a plurality of different focal distances or projection distances, and a lens change control part 80 performing lens change control for changing the lens groups to be arranged on an optical path. COPYRIGHT: (C)2008,JPO&INPIT
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