| 摘要 |
PURPOSE: An actuated mirror array optical system is provided to reduce a ghost light and increase an electric power of a lamp by making a focus distance of a field lens longer. CONSTITUTION: A focus distance(F') makes a distance(S') between a field lens(116) and a source stop(113) longer than a distance(S) between a field lens(116) and the projection stop(120). In case the focus distance(F') is increased and the distance(S) between the field lens(116) and the projection stop(120) is fixed, the distance(S') between the field lens(116) and the source stop(113) gets longer. As a result, a size of the source stop(113) gets larger then a size of the projection stop(120).
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