# US 11,906,893 B2 · Optical system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,906,893 B2 - Document ID: US11906893B2 - Status: Granted - Kind: B2 - Application number: 17/794,041 - Filed: 2021-01-26 - Published: 2023-02-16 - Granted: 2024-02-20 - Earliest claimed: 2020-02-05 - Assignees: Sony Group Corporation - Applicants: Sony Group Corporation - Inventors: Kazumasa Kaneda - Web page: https://patentgrep.com/patent/US11906893B2 ## CPC - G03B 33/08: Sequential recording or projection (G03B33/02, G03B33/04, G03B33/06 take precedence) - F21S 2/00: Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction - F21V 7/26: the material comprising photoluminescent substances - F21V 7/28: characterised by coatings - F21V 9/14: for producing polarised light - F21V 9/20: Dichroic filters, i.e. devices operating on the principle of wave interference to pass specific ranges of wavelengths while cancelling others - F21V 9/32: characterised by the arrangement of the photoluminescent material - F21V 9/40: with provision for controlling spectral properties, e.g. colour, or intensity - F21V 9/45: by adjustment of photoluminescent elements - G02B 5/20: Filters (polarising elements G02B5/30) - G02B 5/28: Interference filters - G03B 21/204: {using secondary light emission, e.g. luminescence or fluorescence (using different colours G03B33/00; if related to video signals H04N9/3197)} - G03B 21/2073: {Polarisers in the lamp house (peculiar to electronic spatial light modulators H04N9/3197)} - G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D) - F21S: NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS - F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract An optical system of the disclosure includes: a fluorescent unit that includes a phosphor region excited by a first color light beam to output fluorescent light including at least one color light beam, and outputs the first color light beam in a first period and outputs 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 first and second regions and disposed on an optical path between the fluorescent unit and the one or two light valves, the first region 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 outputting the fluorescent light from the fluorescent unit to be able to reach the one or two light valves. ## Claims ### Claim 1 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; 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 comprises a wavelength selective filter having mutually different wavelength selective properties between the first region and the second region; and a polarizing dichroic plate disposed on the optical path between the fluorescent unit and the one or two light valves, the polarizing dichroic plate reflecting the first color light beam toward the fluorescent unit and transmitting the first color light beam and the fluorescent light reflected by the fluorescent unit, wherein the wavelength selective filter is disposed on an optical path between the fluorescent unit and the polarizing dichroic plate. ### Claim 2 (depends on 1) The optical system according to claim 1, wherein the second region comprises a region outside the first region in the region division element. ### Claim 3 (depends on 2) The optical system according to claim 2, wherein the first region and the second region are provided concentrically in the region division element. ### Claim 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. ### Claim 5 (depends on 4) The optical system according to claim 4, wherein the region division element comprises a wavelength selective filter having mutually different wavelength selective properties between the first region and the second region. ### Claim 6 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; 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 comprises a wavelength selective filter having mutually different wavelength selective properties between the first region and the second region; and a polarizing dichroic plate disposed on the optical path between the fluorescent unit and the one or two light valves, the polarizing dichroic plate reflecting the first color light beam toward the fluorescent unit and transmitting the first color light beam and the fluorescent light reflected by the fluorescent unit, wherein the wavelength selective filter is disposed on an optical path between the polarizing dichroic plate and the one or two light valves. ### Claim 7 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 of a wavelength selective diffraction grating that, in the second region, diffracts the first color light beam from the fluorescent unit not to reach the one or two light valves, and diffracts the fluorescent light from the fluorescent unit to be able to reach the one or two light valves. ### Claim 8 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 unit further includes a reflective diffuser region that reflects and outputs the first color light beam in the first period in a state of holding a polarization direction, and the phosphor region reflects and outputs the fluorescent light in the second period. ### Claim 9 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 unit further includes a transmissive diffuser region that transmits and outputs the first color light beam in the first period in a state of holding a polarization direction, and the phosphor region transmits and outputs the fluorescent light in the second period. ### Claim 10 (depends on 1) The optical system according to claim 1, 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. ### Claim 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. ### Claim 12 (depends on 1) The optical system according to claim 1, wherein the fluorescent light includes a second color light beam and a third color light beam, and the one light valve is illuminated time-divisionally by the first, second, and third color light beams.