Collimating lens, collimating system, and image displaying apparatus using collimating system

摘要

A collimating lens and a collimating system which condense light emitted from a light source with directivity at a high efficiency and a projection type image displaying apparatus using the same. The collimating system includes a light source having at least one dominant emitting angle at which light having a relatively great intensity distribution is emitted and a collimating lens including at least one prism portion having an exit surface sloping at a prism angle corresponding to the dominant emitting angle.