Patent ID: 9429832
Filing Date: 2016-08-30
CPC Classification: G02B,G03B,H04N,Y10T

Claim Text:
1. A projection type display apparatus comprising: a group of lenses consisting of a plurality of lenses for enlarging an image displayed on a display screen of a display device and projecting an enlarged image on a projection screen, wherein the group of lenses comprises a first lens arranged at a position optically nearest to the projection screen, wherein the first lens has an effective image area through which a light flux of the image is passed and has such a shape that a portion which does not include the effective image area is truncated, and wherein, a height (shift amount) of a position of the displayed enlarged image with respect to an optical axis shared by the plurality of lenses in the vertical direction of the projection screen is increased; and a mirror for reflecting an optical path arranged between the first lens and the projection screen, wherein an upper end of a vertical effective image area of the first lens is located above a lower end of a vertical effective image area of the mirror, wherein the mirror has a predetermined angle of elevation with respect to the optical axis, and wherein the mirror is provided with a mirror moving mechanism adaptable to move the mirror along the optical axis.