Patent ID: 7909472

Claim:
A projection-type image display apparatus, comprising: an image display element which is configured to display an image to be projected onto a display portion; a light source unit which is configured to irradiate light upon the image display element; an enlarging projection optical unit, which is configured to enlargedly project the lights from the light source unit onto the display portion, enlargedly; and a display controller portion which is configured to move a position of the image displayed on the image display element within a display surface of the image display element, wherein the enlarging projection optical unit, includes: a projection lens which is configured to enlargedly project the image of the image display element; a group of lenses which are disposed on a same optical axis, sequentially arranged from a side of the image display element and which include at least one lens having a lens surface; and a reflection mirror having a reflection surface which is disposed between the group of lenses and the display portion; wherein the image display element has a display surface larger than a display surface of the display portion, when an entirety of the image display element is enlargedly projected on the display portion through the enlarging projection optical unit; and wherein the display controller portion enables movement of the image on the display surface of the image display element, within the display surface of the image display element so as to selectively project a portion fitting to the display portion on the display portion when projected through the enlarging projection optical unit and thereby enabling an installation position of said projection-type image display apparatus to be movable with respect to the display portion.