Patent ID: 7586687
Filing Date: 2009-09-08
Classification: G02B

Abstract:
1. A projection type image display device comprising: an image display element; a first optical system including a projecting lens which is arranged to enlarge an image formed on the image display element to be projected onto a screen, and includes a front group having a coaxial optical system having a surface symmetrical with respect to an axis passing a center of an image plane of the image display element, and a rear group having at least one free-form curved surface lens having a free-form curved surface shape on at least one of side surfaces thereof opposite to each other, a second optical system having at least one free-form curved surface mirror having a free-form curved surface shape so that the image enlarged by the projecting lens is projected obliquely onto a screen, and a mechanism enabling the free-form curved surface mirror to be rotated on an axis passing a center of the free-form curved surface mirror, wherein the image display element, the projecting lens and the second optical system are fixed to a common optical system base.