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.
