# US 2014/0152964 A1 · Illumination device and projector > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0152964 A1 - Document ID: US20140152964A1 - Status: Published application - Kind: A1 - Application number: 14/172,168 - Filed: 2014-02-04 - Published: 2014-06-05 - Earliest claimed: 2010-03-18 - Assignees: Seiko Epson Corporation - Applicants: Seiko Epson Corporation - Inventors: Hidefumi SAKATA; Shunji KAMIJIMA; Akira MIYAMAE; Shuji NARIMATSU - Web page: https://patentgrep.com/patent/US20140152964A1 ## CPC - G02B 26/008: {in the form of devices for effecting sequential colour changes, e.g. colour wheels} - F21V 9/08: for producing coloured light, e.g. monochromatic; for reducing intensity of light (with provision for controlling the colour F21V9/40) - G02B 7/008: {with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation} - G03B 21/142: {Adjusting of projection optics} - 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 21/28: Reflectors in projection beam {(in illumination beam G03B21/2066)} - G03B 33/08: Sequential recording or projection (G03B33/02, G03B33/04, G03B33/06 take precedence) - G03B 33/12: using beam-splitting or beam-combining systems, e.g. dichroic mirrors - G02B 26/007: {the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light} - H04N 2209/043: using an alternating colour separation filter, e.g. colour wheel or colour LCD - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR - 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) - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract An illumination device includes: a light source device adapted to emit an excitation light beam; and a rotating fluorescent plate having a single fluorescent layer adapted to convert a part or whole of the excitation light beam into a fluorescent light beam. The fluorescent light beam includes two or more colored light beams, and the single fluorescent layer is formed on a circular disk, which can be rotated by a motor, continuously along a circumferential direction of the circular disk. ## Claims ### Claim 1 An illumination device comprising: a light source device adapted to emit an excitation light beam; and a rotating fluorescent plate having a fluorescent layer formed on a disk, which can be rotated by a motor, along a circumferential direction of the disk, the fluorescent layer converting a part or whole of the excitation light beam into a fluorescent light beam that includes two or more colored lights and emitting the two or more colored lights simultaneously. ### Claim 2 (depends on 1) The illumination device according to claim 1, wherein the light source device emits a blue light beam as the excitation light beam, and the fluorescent layer converts a part of the blue light beam emitted from the light source device into the fluorescent light beam that includes red light and green light, and transmits a part of a remaining part of the blue light beam without performing the conversion. ### Claim 3 (depends on 1) The illumination device according to claim 1, wherein the light source device emits one of a violet light beam and an ultraviolet light beam as the excitation light beam, and the fluorescent layer converts the one of the violet light beam and the ultraviolet light beam emitted from the light source device into the fluorescent light beam that includes red light, green light and blue light. ### Claim 4 (depends on 1) The illumination device according to claim 1, wherein the light source device emits a blue light beam as the excitation light beam, and the fluorescent layer converts the blue light beam emitted from the light source device into the fluorescent light beam that includes red light and green light. ### Claim 5 (depends on 1) The illumination device according to claim 1, wherein the disk has a circular shape and is made of a material that transmits the excitation light beam, the fluorescent layer is formed on the disk via a dichroic film adapted to transmit the excitation light beam and to reflect the fluorescent light beam, and the excitation light beam is arranged to enter the rotating fluorescent plate from a side of the disk. ### Claim 6 (depends on 1) The illumination device according to claim 1, wherein the disk has a circular shape, the fluorescent layer is formed on the disk via a reflecting film adapted to reflect a visible light beam, and the excitation light beam is arranged to enter the rotating fluorescent plate from a side of the fluorescent layer. ### Claim 7 (depends on 1) The illumination device according to claim 1, further comprising: a light collection optical system disposed in a light path from the light source device to the rotating fluorescent plate, and adapted to make the excitation light beam enter the fluorescent layer. ### Claim 8 (depends on 7) The illumination device according to claim 7, wherein the light collection optical system makes the excitation light beam enter the fluorescent layer in a roughly focused state. ### Claim 9 (depends on 1) The illumination device according to claim 1, wherein the fluorescent layer consists of a single layer. ### Claim 10 (depends on 9) The illumination device according to claim 9, wherein the fluorescent layer is formed on the disk continuously along the circumferential direction of the disk. ### Claim 11 A projector comprising: an illumination device that includes a light source device adapted to emit an excitation light beam, and a fluorescent layer; a light modulation device adapted to modulate, in accordance with image information, an illumination light beam emitted from the illumination device; and a projection optical system adapted to project a modulated light emitted from the light modulation device as a projection image, wherein the fluorescent layer converts a part or whole of the excitation light beam into a fluorescent light beam that includes two or more colored lights, and emits the two or more colored lights simultaneously. ### Claim 12 (depends on 11) The projector according to claim 11, wherein the light source device emits a blue light beam as the excitation light beam, and the fluorescent layer converts a part of the blue light beam emitted from the light source device into the fluorescent light beam that includes red light and green light, and transmits a part of a remaining part of the blue light beam without performing the conversion. ### Claim 13 (depends on 11) The projector according to claim 11, further comprising: a second illumination device adapted to emit a blue light beam, wherein the light source device emits a blue light beam as the excitation light beam, and the fluorescent layer converts the excitation light beam into the fluorescent light beam that includes red light and green light. ### Claim 14 (depends on 13) The projector according to claim 13, wherein the second illumination device includes a second light source device adapted to emit the blue light beam, and a scattering plate adapted to scatter the light beam emitted from the second light source device at a predetermined scattering intensity. ### Claim 15 (depends on 11) The projector according to claim 11, further comprising: a substrate made of a material that transmits the excitation light beam, the substrate being provided with the fluorescent layer, and a dichroic film disposed between the substrate and the fluorescent layer, the dichroic film transmitting the excitation light beam and reflecting the fluorescent light beam, wherein the excitation light beam is arranged to enter the fluorescent layer through the substrate. ### Claim 16 (depends on 15) The projector according to claim 15, wherein the substrate is made of a rotatable disk, and the fluorescent layer is formed continuously along a circumferential direction of the disk. ### Claim 17 (depends on 11) The projector according to claim 11, further comprising: a substrate provided with the fluorescent layer, and a reflecting film disposed between the substrate and the fluorescent layer, the reflecting film reflecting a visible light beam, wherein the excitation light beam is arranged to enter the fluorescent layer from a side opposing to a side of the substrate. ### Claim 18 (depends on 17) The projector according to claim 17, wherein the substrate is made of a rotatable disk, and the fluorescent layer is formed continuously along a circumferential direction of the disk. ### Claim 19 (depends on 11) The projector according to claim 11, further comprising: a light collection optical system disposed on a light path from the light source device to the fluorescent layer. ### Claim 20 (depends on 19) The projector according to claim 19, wherein the light collection optical system makes the excitation light beam enter the fluorescent layer in a roughly focused state. ### Claim 21 (depends on 11) The projector according to claim 11, further comprising: an integrator optical system disposed on a light path from the fluorescent plate to the light modulation device.