| 摘要 |
PROBLEM TO BE SOLVED: To provide a projection lens unit that allows deterioration of a projection image due to a temperature change to be surely corrected.SOLUTION: A projection lens unit 100 comprises: a plurality of lenses 2; a movable lens barrel 4 that holds the plurality of lenses 2, and is movably provided along an optical axis of the projection lens unit 100; a damper 6 that is provided so as to protrude toward a height direction of the projection lens unit 100 from the same height as that of an optical axis of a housing 1 of the projection lens unit 100, and is extendable/contractable due to a temperature change; and a lever 7 that is provided rotatably around a center of the optical axis and abuts on an upper edge of the damper 6. The movable lens barrel 4 and the lever 7 are provided so that the lever 7 rotates centering around the optical axis to thereby allow the movable lens barrel 4 to move along the optical axis. By extension/contraction of the damper 6 due to a temperature change, the lever 7 is configured to rotate centering around the optical axis and the movable lens barrel 4 is configured to move along the optical axis. |
