Patent ID: 6869192

Claim:
A projector for projecting a picture on a surface to be projected, comprising: a projector main body; a lens unit for projecting a picture; a cylindrical focus ring inserted along a direction in which an optical axis of said lens unit extends, attached in such a manner as to surround an outer periphery of said lens unit in a circumferential direction, and molded with resin; a first rib, provided on the outer periphery of said lens unit, extending along a direction in which said optical axis extends and a second rib, brought into contact with one end of said first rib, extending along a direction approximately orthogonal to said first rib so as to have one side and the other side; and a pair of protrusion parts provided on an inner periphery of said cylindrical focus ring, and arranged with a spacing in a direction approximately orthogonal to the direction in which said optical axis extends, wherein said first rib is sandwiched between said pair of protrusion parts in the circumferential direction and, also, said second rib is engaged with said pair of protrusion parts along said optical axis, whereby said focus ring is fixed to said lens unit.