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公开(公告)号：US10313646B2
公开(公告)日：2019-06-04
申请号：US16075338
申请日：2016-10-25
申请人： MAXELL, LTD.
发明人： Akihiro Shiraishi , Kazuo Shikita
摘要： A projection-type video image display apparatus measures quantity of light of a plurality of light sources by maintaining illuminance distribution of an illumination luminous flux. The apparatus includes R, B and G light sources, and a mirror configured to reflect white light obtained by synthesizing the light rays emitted from the respective light sources while making the white light pass through the mirror based on predetermined transmittance characteristics. An illuminance sensor disposed on the mirror's back surface and configured to measure quantity of light for each color of the white light which passed through the mirror, and a controller adjusts an amount of light emission of the light source of each color based on the quantity of light measured. The mirror allows the transmittance characteristics of each light transmittance in the center wavelengths of the R and B lights sources to be larger than those of the G light source.
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公开(公告)号：US11422449B2
公开(公告)日：2022-08-23
申请号：US17042389
申请日：2019-02-28
申请人： Maxell, Ltd.
发明人： Hiroshi Nakamori , Kazuo Shikita , Akihiro Shiraishi , Chiaki Kinno , Takuya Shimizu , Minjoo Park
摘要： A projector generates white light from a laser light source and uses the white light for image display. The white light generator has a rectangular light generating lens that generates excitation light of a rectangular shape from the blue light of a blue laser and a phosphor wheel, coated with a phosphor that is irradiated with the excitation light, to emit yellow light. In the phosphor wheel, a length in the vertical direction of a rectangular shape of an irradiation region is represented by v, and a length in the horizontal direction is represented by h, wherein h
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公开(公告)号：US10921700B2
公开(公告)日：2021-02-16
申请号：US16963275
申请日：2019-01-23
申请人： Maxell, Ltd.
发明人： Minjoo Park , Kazuo Shikita , Chiaki Kinno , Akihiro Shiraishi , Takuya Shimizu , Hiroshi Nakamori
摘要： The projector appropriately generates white light from a laser light source and uses the white light for image display. A white light generator that generates white light from blue light and yellow light includes a dichroic mirror that is irradiated with blue light from a blue laser, a first condenser lens that focuses the blue light that has passed through the dichroic mirror, a diffusion plate that diffuses the focused blue light, a second condenser lens that focuses the blue light obtained by allowing the diffused blue light to pass through the dichroic mirror, and a phosphor that is irradiated with the focused blue light to emit yellow light; the diffusion plate is an alumina ceramic plate; the dichroic mirror has a first region that transmits one of the blue light and the yellow light and reflects the other and a second region that reflects or transmits both.
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公开(公告)号：US11378874B2
公开(公告)日：2022-07-05
申请号：US16956619
申请日：2017-12-27
申请人： Maxell, Ltd.
摘要： 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.
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公开(公告)号：US10416543B2
公开(公告)日：2019-09-17
申请号：US16075313
申请日：2016-09-23
申请人： MAXELL, LTD.
摘要： In a projection-type image display apparatus configured to project images formed on a display element by using light from a plurality of light sources, the apparatus includes light-source coolers provided to the light sources and configured to cool the light sources, and the light-source coolers are arranged so that light-source heat dissipating directions of all the light-source coolers are substantially the same among the light-source coolers the light-source heat dissipating directions being directed toward heat dissipating parts dissipating the heat of the light sources with reference to heat absorbing parts absorbing the heat of the light sources.
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公开(公告)号：US10382730B1
公开(公告)日：2019-08-13
申请号：US16390266
申请日：2019-04-22
申请人： MAXELL, LTD.
发明人： Akihiro Shiraishi , Kazuo Shikita
摘要： A projection-type video image display apparatus measures quantity of light of a plurality of light sources by maintaining illuminance distribution of an illumination luminous flux. The apparatus includes R, B and G light sources, and a mirror configured to reflect white light obtained by synthesizing the light rays emitted from the respective light sources while making the white light pass through the mirror based on predetermined transmittance characteristics. An illuminance sensor disposed on the mirror's back surface and configured to measure quantity of light for each color of the white light which passed through the mirror, and a controller adjusts an amount of light emission of the light source of each color based on the quantity of light measured. The mirror allows the transmittance characteristics of each light transmittance in the center wavelengths of the R and B lights sources to be larger than those of the G light source.
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