Patent ID: 11906893
Assignee: SONY GROUP CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  F | IPC G

Claim 10:
11. An optical system, comprising:
a fluorescent unit including a phosphor region excited by a first color light beam to output fluorescent light including at least one color light beam, the fluorescent unit outputting the first color light beam in a first period and outputting the fluorescent light in a second period;
one or two light valves illuminated by at least one of the first color light beam or the fluorescent light; and
a region division element including a first region and a second region and being disposed on an optical path between the fluorescent unit and the one or two light valves, the first region having a property of outputting the first color light beam and the fluorescent light from the fluorescent unit to be able to reach the one or two light valves, the second region having a property of outputting the fluorescent light from the fluorescent unit to be able to reach the one or two light valves, wherein
the fluorescent light includes a second color light beam and a third color light beam
the two light valves include a first light valve and a second light valve,
the first light valve is illuminated time-divisionally by the first color light beam and the second color light beam, and
the second light valve is illuminated by the third color light beam or illuminated time-divisionally by the first color light beam and the third color light beam;
an illumination optics system that generates illumination light for the two light valves on a basis of the first color light beam and the fluorescent light from the fluorescent unit;
a first polarization rotation element disposed at a pupil position of the illumination optics system and including a first divided region and a second divided region, the first divided region and the second divided region having mutually different polarization properties with respect to the first color light beam;
a projection optics system on which the first, second, and third color light beams after having been modulated by the first and second light valves are incident; and
a second polarization rotation element disposed at a pupil position of the projection optics system conjugate to the pupil position of the illumination optics system and including a third divided region and a fourth divided region, the third divided region having a polarization property corresponding to the first divided region, the fourth divided region having a polarization property corresponding to the second divided region.