Patent ID: 8529074

Claim:
A projection optical system for projecting an image of an image display element, comprising: a lens movable to perform zooming; a stop; a holder configured to hold said lens and disposed at an image-display-element side of said stop; and a light blocking member disposed at the image-display-element side of said stop and fixed within said holder; wherein part of said light blocking member includes an extended part that extends to a position nearer to an optical axis of said lens beyond said holder, and at least a part of a face of the extended part of said light-blocking member nearer to the image-display-element side is inclined in a section including an optical axis of said lens so that a point nearer to the optical axis comes closer to the image display element, and wherein said holder is capable of effecting a zooming movement integrally with said lens and said light blocking member in the optical axis direction to perform the zooming.