Patent ID: 7883220

Claim:
A projection apparatus comprising: a housing; a transmission-type screen provided on a front side of said housing; an optical engine provided in said housing, said optical engine projecting an image on said transmission-type screen from a rear side of said transmission-type screen; an engine supporting plate on which said optical engine is placed, said engine supporting plate being provided in said housing so that an angle of said engine supporting plate is adjusted to thereby adjust a projecting direction of said optical engine; a base portion provided on an inner bottom surface of said housing; an adjusting member having a substantially wedge-shape with nonparallel upper and lower surfaces, said adjusting member being inserted into between said base portion and a lower surface of said engine supporting plate, so that front or rear end of said engine supporting plate is vertically rotatable; a front-to-rear position adjusting unit capable of pushing said adjusting member frontward and pulling said adjusting member rearward; a slope portion having a slope surface that gradually increases or decreases an angle of a surface of said adjusting member that contacts said engine supporting plate in accordance with a movement of said adjusting member in front-to-rear direction, and a fixing unit that fixes said engine supporting plate to an adjusted position, wherein said engine supporting plate has a convex-shaped center shaft protrusion at an end thereof opposite to a vertically rotated end, and wherein said base portion has a center shaft receiving portion in the form of a concave or through-hole capable of receiving said center shaft protrusion.