Patent ID: 7164546

Claim:
A lens shift mechanism for shifting a projection lens unit for projecting an image in a direction perpendicular to its optical axis, the lens shift mechanism comprising: a lens mounting member to which said projection lens unit is fixed; a contact member with which said lens mounting member is brought into contact; and a pressing mechanism for pressing said lens mounting member against said contact member with a pressing force that can hold the position of said projection lens unit and allow shifting of the position of the projection lens unit, the pressing mechanism including a coiled spring and a sliding contact member that is pressed against the lens mounting member by a pressing force of the coiled spring, wherein the lens mounting member is interposed between the contact member and the sliding contact member of the pressing mechanism and in contact with the contact member and the sliding contact member of the pressing mechanism such that the lens mounting member slides against surfaces of both the contact member and the sliding contact member of the pressing mechanism when the projection lens unit is shifted.