PROJECTION OPTICAL SYSTEM AND PROJECTOR
A projection optical system according to the present disclosure includes an intermediate image forming lens group and a concave mirror. The intermediate image forming lens group forms an intermediate image of an image of a projection target. The concave mirror is disposed on an optical path after th...
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Format: | Patent |
Sprache: | eng ; fre ; ger |
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Zusammenfassung: | A projection optical system according to the present disclosure includes an intermediate image forming lens group and a concave mirror. The intermediate image forming lens group forms an intermediate image of an image of a projection target. The concave mirror is disposed on an optical path after the intermediate image is formed. The concave mirror forming a projection image on a projection surface. The intermediate image forming lens group and the concave mirror are disposed in order from side of the image of the projection target toward side of the projection surface. The intermediate image forming lens group includes a movable group that travels on an optical axis to perform focus adjustment. The movable group includes a concave lens having an aspherical surface. |
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