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

Claim 3:
4. 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 region division element has a property as a wavelength selective filter having mutually different wavelength selective properties between the first region and the second region and a property as a polarizing dichroic plate having mutually different polarization properties between the first region and the second region,
the region division element has properties, in the first region, of reflecting the first color light beam of a first polarization component toward the fluorescent unit and of transmitting the fluorescent light and the first color light beam of a second polarization component from the fluorescent unit reflected by the fluorescent unit, and
the region division element has properties, in the second region, of reflecting the first color light beam toward the fluorescent unit, regardless of a polarization component, and of transmitting the fluorescent light from the fluorescent unit reflected by the fluorescent unit.