| 摘要 |
A doughnut-shaped dust-proof plate is externally fitted in the body of the projection lens. The dust-proof plate comprises a first member which is flexible like rubber and a second member made of plastic which is uneasy to deform. The second member is made lower in a vertical direction (lengthwise) than the first member, thereby making it possible to allow deformation at an upper end and a lower end of the first member. On the other hand, the second member is made long in a horizontal direction (crosswise). A longitudinal portion of the second member is set to have such a length that it can come into contact with a lower wall of the frame of the liquid crystal projector even if the projection lens is positioned at the uppermost position and can come into contact with an upper wall of the frame even if the projection lens is positioned at the lowermost position in a state where the dust-proof plate is obliquely turned. Therefore, the dust-proof plate is prevented from being turned at an angle of 90 degrees.
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