US Patent 10942327 Centering mechanism, lens unit, projection system, and projector

A centering pin pushes an inclining surface provided as part of a side section of a lens frame that accommodates a centering target lens that is a centering target lens group to allow the centering target lens to move in a centering direction. In this process, an end surface of the lens frame is always urged against a reference surface that positions the lens frame attached to an attachment section of a lens barrel in the optical axis direction.