Patent ID: 8403504
Filing Date: 2013-03-26
Classification: G03B

Abstract:
1. A projection type display apparatus, comprising: a light source for emitting a light; a first reflection portion, which is configured to reflect the light from said light source; an image display element, which is configured to modulate the light from said first reflection portion; a lens group, which is made up with a plural number of lens elements, including a first and a second lens group, transmitting the light from said image display element; and a second reflection portion, which is configured to reflect the light from said first and said second lens group thereupon, wherein an optical axis of said light source is nearly perpendicular to an optical axis of both said first and said second lens group, said second reflection portion is so disposed that it inclines to an optical axis of said first and said second lens group at a predetermined angle, said light source is disposed so as to bring an optical axis of the light source to be nearly horizontal, even if the protection type display apparatus is disposed in either a nearly vertical disposition or a nearly horizontal disposition to extend the light source life time, wherein the optical axis of the light source and an input optical axis into the second reflection portion intersect perpendicular with each other; wherein said first lens group and said second lens group are connected in series with each other and placed in between said first and said second reflection portion, wherein said projection type display apparatus configured to have a first mode of being disposed vertically, and a second mode of being disposed horizontally, and in said first mode, optical axis of said light source is nearly in parallel with a surface, on which said projection type display apparatus is disposed, and the optical axes of said first and second lens groups are nearly perpendicular to the that surface, and in said second mode, the optical axis of said light source and the optical axes of said second lens groups are nearly in parallel with that surface.