Patent ID: 7670009

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 said image display element; an enlarged projection optical unit, which is configured to project the lights from said light source unit onto said display portion, enlargedly; and a display controller portion, which is configured to move position of the image displayed on said image display element within a display surface of said element, wherein said enlarged projection optical unit, further comprising: a projection lens, which is configured to project the image of said image display element, enlargedly; a group of lenses, which are disposed on a same optical axis, sequentially from a side of said image display element and include at least one (1) piece of a lens having a freely curved surface; and a reflection mirror having a reflection surface made up with a freely curved surface, which is disposed between said group of lenses and said display portion, wherein said image display element has a display surface larger than said display portion, when a whole body thereof is projected on said display portion, through said enlarged projection optical unit, to be displayed by projection thereof, said display controller portion brings the image on the display surface of said image display element to be movable, within the display surface of said image display element, so as to project a portion fitting to said display portion, selectively, to be displayed, when projecting it through said enlarged projection optical unit upon said display portion, to be displayed, and thereby enabling an installation position of said projection-type image display apparatus to be movable with respect to said display portion.