Maxell, Ltd.

Hiroshi Oshima

Shinro Inui

Nobuki Matsui

Eiki Ishijima

Provided is a technique capable of achieving a manually-operated lens shift mechanism in a space-saving manner in regard to a projection type image display apparatus. The lens shift mechanism includes a first base, a second base, a third base to which a projection lens is fixed, a first shift portion moves the projection lens in a vertical direction by moving the second base in the vertical direction with respect to the first base, and a second shift portion which moves the projection lens in a horizontal direction by moving the third base in the horizontal direction with respect to the second base. The first shift portion is arranged along the vertical direction to be coaxial with a first manual operation portion and a first rotation shaft. The second shift portion is arranged along the vertical direction to be coaxial with a second manual operation portion and a second rotation shaft.

Projection type image display apparatus

A lens shift mechanismof the projection-type image display deviceincludes a horizontal movable basefor horizontally shifting a projection lens, a vertical movable basefor vertically shifting the projection lens, and a horizontal drive actuatorand a vertical drive actuatorfor driving these bases. Driving forces of these actuatorsare transmitted via respective lead screws() and a pair of lead nuts() meshing with the lead screws to shift the bases. A pair of lead nuts are installed with elastic bodies() applying a pressure such that the pair of lead nuts recede from or approach each other in the axial direction of the lead screw. In this configuration, a delay in the shift operation is removed by reducing a backlash in the lens movement.

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Kyoto, Japan

Hiroshi Oshima