| 摘要 |
PROBLEM TO BE SOLVED: To provide a lens shift mechanism for a projection type display apparatus, the lens shift mechanism being excellent in operability and reliability such that a large amount of movement can be easily obtained despite a simple structure and displacement of a projection lens is prevented even if external force is applied to the main body of the apparatus or the projection lens. SOLUTION: A horizontal shift plate 20 can be slid in a horizontal direction by a base plate 13 and a horizontal shift shaft 41, which are fixed to a housing. Upon the rotation of a rotating disk 34, a projection 19 forming the follower node of a flat cam mechanism is horizontally driven along the sliding face of a groove structure formed on the underside of the rotating disk 34 forming the drive node of the flat cam mechanism. A horizontal shift knob 31 is moved upward by the reaction force of the coil spring 35. However, an amount of upward displacement is limited by a shift knob fixing washer 37. This structure presses the horizontal shift knob 31 against the underside of the upper face 11 of the housing. This makes it possible to prevent an accidental displacement of the projection lens by external force and entry of dust from a shift operating part. COPYRIGHT: (C)2008,JPO&INPIT
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