| 摘要 |
The invention relates to a zoom projection optical system and an image projection device. The zoom projection optical system successively comprises, from a zoom-in conjugate side to a zoom-out conjugate side, first to sixth lens units that have negative optical power, positive optical power, positive optical power, negative optical power, positive optical power and positive optical power in order respectively. When the system is zoomed from a long focus side toward a wide-angle side, the third lens unit and the fifth lens unit move from the zoom-in conjugate side to the zoom-out conjugate side which is substantially telecentric, and the fourth lens unit successively has more than two negative lenses, positive lenses and aperture diaphragms from the above zoom-in conjugate side. Moreover, the image projection device comprises the zoom projection optical system. |
