Speckle reducting device and projector

摘要

A speckle reducing device includes: a polarization splitter element with a polarization splitter portion that splits incident light into first and second light containing a first and a second component respectively, which outputs the first and the second light along different directions; a first reflecting member that reflects the first light to reenter the polarization splitter element; a first conversion member disposed between the first reflecting member and the polarization splitter element, which converts the first light to third light containing the second component; a second reflecting member that reflects the third light to reenter the polarization splitter element; and a second conversion member disposed between the second reflecting member and the polarization splitter element, which converts the third light to fourth light containing the first component, wherein: the polarization splitter element outputs the second and the fourth light along one direction.

主权项

1. An optical device, comprising:
a first polarization splitter unit that splits incident light into first light having a first polarization and second light having a second polarization, and that outputs the first light and the second light; a first reflecting unit that reflects first light output from the first polarization splitter unit back to the first polarization splitter unit; a first partial reflecting unit disposed between the first reflecting unit and the first polarization splitter unit, which reflects a part of the first light output from the first polarization splitter unit and transmits a part of the first light output from the first polarization splitter unit; a first conversion unit disposed between the first reflecting unit and the first polarization splitter unit, which converts light having the first polarization to light having the second polarization; a second reflecting unit that reflects, back to the first polarization splitter unit, first light output from the first polarization splitter unit after having been reflected back to the first polarization splitter unit by the first reflecting unit; and a second conversion unit disposed between the second reflecting unit and the first polarization splitter unit, which converts light having the second polarization to light having the first polarization.