# US 2020/0401030 A1 · Projector > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0401030 A1 - Document ID: US20200401030A1 - Status: Published application - Kind: A1 - Application number: 16/956,619 - Filed: 2017-12-27 - Published: 2020-12-24 - Earliest claimed: 2017-12-27 - Assignees: Maxell, Ltd. - Applicants: Maxell, Ltd. - Inventors: Hiroshi NAKAMORI; Kazuo SHIKITA; Chiaki KINNO; Akihiro SHIRAISHI; Takuya SHIMIZU - Web page: https://patentgrep.com/patent/US20200401030A1 ## CPC - G03B 21/2033: {LED or laser light sources} - G03B 21/204: {using secondary light emission, e.g. luminescence or fluorescence (using different colours G03B33/00; if related to video signals H04N9/3197)} - G02B 19/0033: {characterised by the use} - G03B 21/145: {Housing details, e.g. position adjustments thereof} - G03B 21/2013: {Plural light sources} - G03B 21/2066: {Reflectors in illumination beam (in projection beam G03B21/28)} - G03B 33/12: using beam-splitting or beam-combining systems, e.g. dichroic mirrors - H04N 9/3105: {for displaying all colours simultaneously, e.g. by using two or more electronic spatial light modulators (simultaneous projection in colour photography G03B33/10; beam splitting or combining systems per se G02B27/10)} - H04N 9/3158: {for controlling the spectrum} - H04N 9/3161: {using laser light sources (using laser beams scanning the display screen H04N9/3129)} - G03B 21/28: Reflectors in projection beam {(in illumination beam G03B21/2066)} - 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) - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract A projector includes: a white light generator that uses a blue laser as a light source to generate blue light and yellow light based on the blue laser and generates white light including the generated blue light and yellow light; and an optical system that modulates light based on the white light generated by the white light generator with an image display element and projects the modulated light, wherein the white light generator includes: a dichroic mirror that is irradiated with the blue light from the blue laser as the light source; a first condenser lens that focuses blue light being reflected by or passing through the dichroic mirror; a diffusion plate that diffuses the blue light focused by the first condenser lens; a second condenser lens that focuses the blue light passing through or being reflected by the dichroic mirror; and a phosphor that emits yellow light. ## Claims ### Claim 1 A projector comprising: a white light generator that uses a blue laser as a light source to generate blue light and yellow light based on the blue laser and generates white light including the generated blue light and yellow light; and an optical system that modulates light based on the white light generated by the white light generator with an image display element and projects the modulated light, wherein the white light generator is configured to include: a dichroic mirror that is irradiated with the blue light from the blue laser as the light source; a first condenser lens that focuses blue light being reflected by or passing through the dichroic mirror; a diffusion plate that diffuses the blue light focused by the first condenser lens; a second condenser lens that focuses the blue light passing through or being reflected by the dichroic mirror; and a phosphor that is irradiated with the blue light focused by the second condenser lens to emits yellow light, wherein the dichroic mirror has a first region having a characteristic of transmitting one of blue light and yellow light and reflecting the other and a second region having a characteristic of reflecting or transmitting both the blue light and the yellow light, wherein the blue light included in the white light output by the white light generator is obtained by allowing the blue light diffused by the diffusion plate to pass through the first condenser lens and performing reflection or transmission of the dichroic mirror, and wherein the yellow light included in the white light output from the white light generator is obtained by allowing the yellow light emitted from the phosphor to pass through the second condenser lens and performing reflection or transmission of the dichroic mirror. ### Claim 2 (depends on 1) The projector according to claim 1, wherein the dichroic mirror has a region having blue light transmission/yellow light reflection characteristic as the first region and has a region of totally reflecting characteristic as the second region, wherein the blue light included in the white light output from the white light generator is light obtained by allowing the blue light diffused by the diffusion plate to pass through the first condenser lens and to be irradiated to the dichroic mirror and to pass through the first region, and wherein the yellow light included in the white light output from the white light generator is light obtained by allowing the yellow light emitted from the phosphor to pass through the second condenser lens and to be irradiated to the dichroic mirror and to be reflected from the first region. ### Claim 3 (depends on 1) The projector according to claim 1, wherein the dichroic mirror has a region having blue light reflection/yellow light transmission characteristic as the first region and has a region of totally transmitting characteristic as the second region, wherein the blue light included in the white light output from the white light generator is light obtained by allowing the blue light diffused by the diffusion plate to pass through the first condenser lens and to be irradiated on the dichroic mirror and to be reflected from the first region, and wherein the yellow light included in the white light output from the white light generator is light obtained by allowing the yellow light emitted from the phosphor to pass through the second condenser lens and to be irradiated on the dichroic mirror and to pass through the first region. ### Claim 4 (depends on 1) The projector according to claim 1, wherein, in the dichroic mirror, the second region is arranged at a position to be in contact with an optical axis of the first condenser lens. ### Claim 5 (depends on 1) The projector according to claim 1, wherein, in the dichroic mirror, the second region is arranged at a position to be apart from a position in contact with an optical axis of the first condenser lens. ### Claim 6 (depends on 2) The projector according to claim 2, wherein the light source has a first laser and a second laser, wherein the first laser irradiates a third region at least partially overlapping with both the first region and the second region of the dichroic mirror with blue light, wherein the second laser irradiates a fourth region at least partially overlapping with both the first region and the second region of the dichroic mirror with blue light, and wherein the intensity of the first laser and the intensity of the second laser are respectively variable. ### Claim 7 (depends on 6) The projector according to claim 6, wherein, in the dichroic mirror, the second region is included in a region in which the third region and the fourth region are combined. ### Claim 8 (depends on 6) The projector according to claim 6, wherein, in the dichroic mirror, a ratio of the first region to the second region in the third region is configured to be different from a ratio of the first region to the second region in the fourth region. ### Claim 9 (depends on 6) The projector according to claim 6, wherein a portion of the second region overlapping with the third region and a portion of the second region overlapping with the fourth region are independently arranged and not in touch with each other. ### Claim 10 (depends on 9) The projector according to claim 9, wherein the portion of the second region overlapping with the third region and the portion of the second region overlapping with the fourth region have different sizes. ### Claim 11 (depends on 2) The projector according to claim 2, wherein the light source has a first laser, a second laser, and a third laser, and wherein, in the dichroic mirror, a region irradiated with blue light by the first laser and a region irradiated with blue light by the third laser are included in the first region, and a region irradiated with blue light by the second laser extends over the first region and the second region. ### Claim 12 (depends on 2) The projector according to claim 2, wherein the light source has a first laser, a second laser, and a third laser, wherein the first laser irradiates a third region at least partially overlapping with both the first region and the second region of the dichroic mirror with blue light, wherein the second laser irradiates a fourth region at least partially overlapping with both the first region and the second region of the dichroic mirror with blue light, wherein the third laser irradiates a fifth region at least partially overlapping with both the first region and the second region of the dichroic mirror with blue light, and wherein the intensity of the first laser, the intensity of the second laser, and the intensity of the third laser are respectively variable. ### Claim 13 (depends on 12) The projector according to claim 12, wherein, in the dichroic mirror, the second region is included in a region in which the third region, the fourth region, and the fifth region are combined. ### Claim 14 (depends on 12) The projector according to claim 12, wherein, in the dichroic mirror, a ratio of the first region to the second region in the third region, a ratio of the first region to the second region in the fourth region; and a ratio of the first region and the second region in the fifth region are different from each other. ### Claim 15 (depends on 12) The projector according to claim 12, wherein a portion of the second region overlapping with the third region, a portion of the second region overlapping with the fourth region, and a portion of the second region overlapping with the fifth region are arranged independently of each other and are not in touch which each other. ### Claim 16 (depends on 15) The projector according to claim 15, wherein a portion of the second region overlapping with the third region, a portion of the second region overlapping with the fourth region, and a portion of the second region overlapping with the fifth region have different sizes.