Patents by Inventor Hisashi Masui
Hisashi Masui has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11901702Abstract: A distributed Bragg reflector (DBR) structure on a substrate includes a high refractive index layer comprising titanium oxide (TiO2) and a low refractive index layer having a high carbon region and at least one low carbon region that contacts the high refractive index layer. Multiple layers of the high refractive index layer and the low refractive index layer are stacked. Typically, the multiple layers of the high refractive index layer and the low refractive index layer are stacked to a thickness of less than 10 microns. Each of the respective layers of the high refractive index layer and the low refractive index layer have a thickness of less than 0.2 microns.Type: GrantFiled: July 31, 2020Date of Patent: February 13, 2024Assignee: Lumileds LLCInventors: Ken Shimizu, Hisashi Masui, Ted Wangensteen
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Patent number: 11749787Abstract: An array of phosphor pixels is positioned on an array of semiconductor LED pixels with thermally curable adhesive between them. Selected LED pixels of the array are electrically activated; resulting heat cures the adhesive to attach the corresponding phosphor pixel to the activated LED pixel and to release the corresponding phosphor pixel from a carrier. Removal of the carrier removes unattached phosphor pixels, leaving behind phosphor pixels attached to the LED pixels that were activated. The process can be repeated for phosphor pixels of different colors.Type: GrantFiled: April 13, 2022Date of Patent: September 5, 2023Assignee: Lumileds LLCInventors: Emma Dohner, Kentaro Shimizu, Hisashi Masui
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Patent number: 11749786Abstract: An array of phosphor pixels is positioned on an array of semiconductor LED pixels with thermally curable adhesive between them. Selected LED pixels of the array are electrically activated; resulting heat cures the adhesive to attach the corresponding phosphor pixel to the activated LED pixel and to release the corresponding phosphor pixel from a carrier. Removal of the carrier removes unattached phosphor pixels, leaving behind phosphor pixels attached to the LED pixels that were activated. The process can be repeated for phosphor pixels of different colors.Type: GrantFiled: April 12, 2022Date of Patent: September 5, 2023Assignee: Lumileds LLCInventors: Emma Dohner, Kentaro Shimizu, Hisashi Masui
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Patent number: 11740179Abstract: In a gas sensing system, a light emitter can emit light through a gas sample toward a concave reflective surface. The reflective surface can redirect the emitted light to propagate through the gas sample toward a light sensor. Using, optionally, the Beer-Lambert Law, the system can determine a concentration of the gas material in the gas sample. By selecting a specified shape for the reflective surface, such as a complete or partial ellipsoid, and locating the light emitter and the light sensor in specified locations, such as at one or both foci of the ellipsoid, the gas sensing system can reduce variation in optical path length, from optical path to optical path, in the light that propagates from the light emitter, to the reflective surface, and to the light sensor. Reducing the variation in optical path length can improve an accuracy in determining the concentration of the gas material.Type: GrantFiled: November 5, 2020Date of Patent: August 29, 2023Assignee: Lumileds LLCInventors: Hisashi Masui, Oleg Borisovich Shchekin, Franklin Chiang
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Patent number: 11725802Abstract: A device including a phosphor layer having a plurality of holes or pockets arranged within the phosphor layer to reduce lateral light transmission. The phosphor layer can be sized and positioned to extend over a plurality of LED emitter pixels.Type: GrantFiled: October 18, 2022Date of Patent: August 15, 2023Assignee: Lumileds LLCInventors: Kentaro Shimizu, Venkata Ananth Tamma, Hisashi Masui
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Publication number: 20230197766Abstract: Pixelated array light emitters are formed with closely-spaced pixels having ultra-smooth sidewalls. In methods for making such pixelated array light emitters, a converter layer of phosphor particles dispersed in a binder is disposed on a carrier, and then singulated by saw cuts or similar methods to form an array of phosphor pixels. The binder is fully cured prior to singulation of the converter layer. Further, the carrier is rigid rather than flexible. As a consequence of fully curing the binder and of using a rigid carrier to support the converter layer, singulation results in phosphor pixels having smooth side walls. The array of phosphor pixels is subsequently attached to a corresponding array of LEDs with an adhesive layer, separate from the binder used to form the converter layer. The pixel sidewalls may be formed with controlled morphology, for example at acute or obtuse angles with respect to the carrier.Type: ApplicationFiled: February 23, 2023Publication date: June 22, 2023Applicant: LUMILEDS LLCInventors: Hisashi MASUI, Ken SHIMIZU, Emma DOHNER
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Publication number: 20230168190Abstract: In a gas sensing system, an emitter emits light through a gas toward a concave reflective surface. The reflective surface reflects the light toward a sensor while light that passes through a porous scattering material is scattered. The surface of the reflective surface provides a diffusion of the light. A concentration of the gas is detected by the sensor. The scattering material may be permeable or non-permeable to the gas. The scattering and reflecting of the light increases the distance the light travels from the emitter to the sensor to increase absorption of the light by the gas.Type: ApplicationFiled: November 14, 2022Publication date: June 1, 2023Inventors: Hisashi Masui, Oleg Borisovich Shchekin, Franklin Chiang, Emma Dohner
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Publication number: 20230168191Abstract: A gas sensing system measures a concentration of first and second gasses in a gas sample disposed in a cavity containing a porous scattering material. The first and second gas each have an absorption peak at a different wavelength. First and second emitters emit light having a spectrum that includes one of the different wavelengths. A single sensor, or multiple sensors, detect at least some of the light emitted by the first and second emitters. A processor determines concentration of the first and second gases from signals from the sensor that indicate intensities of the light from the first and second emitters. When a single sensor is used, the first and second emitters are driven, and the sensor signal detected, at different times. When multiple sensors are used, the sensors detect signals at one of the absorption peaks.Type: ApplicationFiled: November 21, 2022Publication date: June 1, 2023Inventors: Claire Yue Gao, Hisashi Masui, Franklin Chiang
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Publication number: 20230168193Abstract: A gas sensing system measures a concentration of a gas sample having an absorption peak at a first wavelength. An emitter emits light having a spectrum that includes at least the first wavelength. A sensor detects at least some of the light emitted by the emitter. A porous scattering material is substantially transparent at the first wavelength and scatters at least some of the light. A surface of the porous scattering material opposing the emitter and the sensor has a depression. The emitter and the sensor are laterally and vertically separated by a separator filling the depression. The separator specularly or diffusively reflects the light emitted by the emitter.Type: ApplicationFiled: November 28, 2022Publication date: June 1, 2023Inventors: Florent Gregoire Monestier, Franklin Chiang, Hisashi Masui
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Patent number: 11621292Abstract: Pixelated array light emitters are formed with closely-spaced pixels having ultra-smooth sidewalk. In methods for making such pixelated array light emitters, a converter layer of phosphor particles dispersed in a binder is disposed on a carrier, and then singulated by saw cuts or similar methods to form an array of phosphor pixels. The binder is fully cured prior to singulation of the converter layer. Further, the carrier is rigid rather than flexible. As a consequence of fully curing the binder and of using a rigid carrier to support the converter layer, singulation results in phosphor pixels having smooth side walls. The array of phosphor pixels is subsequently attached to a corresponding array of LEDs with an adhesive layer, separate from the binder used to form the converter layer. The pixel sidewalls may be formed with controlled morphology, for example at acute or obtuse angles with respect to the carrier.Type: GrantFiled: January 25, 2021Date of Patent: April 4, 2023Assignee: Lumileds LLCInventors: Hisashi Masui, Ken Shimizu, Emma Dohner
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Publication number: 20230045625Abstract: Systems for apparatuses formed of light emitting devices. Solutions for controlling the off-state appearance of lighting system designs is disclosed. Thermochromic materials are selected in accordance with a desired off-state of an LED device. The thermochromic materials are applied to a structure that is in a light path of light emitted by the LED device. In the off-state the LED device produces a desired off-state colored appearance. When the LED device is in the on-state, the thermochromic materials heat up and become more and more transparent. The light emitted from the device in its on-state does not suffer from color shifting due to the presence of the thermochromic materials. Furthermore, light emitted from the LED device in its on-state does not suffer from attenuation due to the presence of the thermochromic materials. Techniques to select and position thermochromic materials in or around LED apparatuses are presented.Type: ApplicationFiled: October 12, 2022Publication date: February 9, 2023Applicant: Lumileds LLCInventors: Hisashi Masui, Oleg Shchekin, Ken Shimizu, Marcel Bohmer, Frank Jin, Jyoti Bhardwaj
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Publication number: 20230039821Abstract: A device including a phosphor layer having a plurality of holes or pockets arranged within the phosphor layer to reduce lateral light transmission. The phosphor layer can be sized and positioned to extend over a plurality of LED emitter pixels.Type: ApplicationFiled: October 18, 2022Publication date: February 9, 2023Applicant: Lumileds LLCInventors: Kentaro SHIMIZU, Venkata Ananth TAMMA, Hisashi MASUI
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Publication number: 20220415863Abstract: This specification discloses LED arrays comprising a grid structure that physically and optically isolates adjacent LEDs or groups of LEDs in the array from each other. The grid structure comprises an arrangement of walls defining cells. Individual LEDs or groups of LEDs in the array are positioned within different ones of the cells, separated from adjacent LEDs or groups of LEDs by the grid walls. This specification also discloses fabrication processes for such LED arrays. In these fabrication processes, the grid structure is formed as a separate monolithic structure. The LEDs or pcLEDs are arranged on and attached to a substrate (for example, a printed circuit board), after which the grid structure is attached to the substrate in registry with the arrangement of LEDs or pcLEDs.Type: ApplicationFiled: June 24, 2022Publication date: December 29, 2022Applicant: LUMILEDS LLCInventors: Hisashi Masui, Franklin Chiang
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Publication number: 20220359799Abstract: A wavelength converting layer is partially diced to generate a first and second wavelength converting layer segment and to allow partial isolation between the first segment and the second segment such that the wavelength converting layer segments are connected by a connecting wavelength converting layer. The first and second wavelength converting layer segments are attached to a first and second light emitting device, respectively to create a first and second pixel. The connecting wavelength converting layer segment is removed to allow complete isolation between the first pixel and the second pixel. An optical isolation material is applied to exposed surfaces of the first and second pixel and a sacrificial portion of the wavelength converting layer segments and optical isolation material attached to the sacrificial portion is removed from a surface facing away from the first light emitting device, to expose a emitting surface of the first wavelength converting layer segment.Type: ApplicationFiled: July 26, 2022Publication date: November 10, 2022Applicant: Lumileds LLCInventors: Kentaro SHIMIZU, Hisashi MASUI, Yu-Chen SHEN, Danielle Russell CHAMBERLIN, Peter Josef SCHMIDT
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Patent number: 11486562Abstract: Systems for apparatuses formed of light emitting devices. Solutions for controlling the off-state appearance of lighting system designs is disclosed. Thermochromic materials are selected in accordance with a desired off-state of an LED device. The thermochromic materials are applied to a structure that is in a light path of light emitted by the LED device. In the off-state the LED device produces a desired off-state colored appearance. When the LED device is in the on-state, the thermochromic materials heat up and become more and more transparent. The light emitted from the device in its on-state does not suffer from color shifting due to the presence of the thermochromic materials. Furthermore, light emitted from the LED device in its on-state does not suffer from attenuation due to the presence of the thermochromic materials. Techniques to select and position thermochromic materials in or around LED apparatuses are presented.Type: GrantFiled: September 22, 2020Date of Patent: November 1, 2022Assignee: Lumileds LLCInventors: Hisashi Masui, Oleg Shchekin, Ken Shimizu, Marcel Bohmer, Frank Jin, Jyoti Bhardwaj
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Patent number: 11480315Abstract: A device including a phosphor layer having a plurality of holes or pockets arranged within the phosphor layer to reduce lateral light transmission. The phosphor layer can be sized and positioned to extend over a plurality of LED emitter pixels.Type: GrantFiled: June 30, 2021Date of Patent: October 25, 2022Assignee: Lumileds LLCInventors: Kentaro Shimizu, Venkata Ananth Tamma, Hisashi Masui
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Patent number: 11411147Abstract: A wavelength converting layer is partially diced to generate a first and second wavelength converting layer segment and to allow partial isolation between the first segment and the second segment such that the wavelength converting layer segments are connected by a connecting wavelength converting layer. The first and second wavelength converting layer segments are attached to a first and second light emitting device, respectively to create a first and second pixel. The connecting wavelength converting layer segment is removed to allow complete isolation between the first pixel and the second pixel. An optical isolation material is applied to exposed surfaces of the first and second pixel and a sacrificial portion of the wavelength converting layer segments and optical isolation material attached to the sacrificial portion is removed from a surface facing away from the first light emitting device, to expose a emitting surface of the first wavelength converting layer segment.Type: GrantFiled: June 30, 2020Date of Patent: August 9, 2022Assignee: Lumileds LLCInventors: Kentaro Shimizu, Hisashi Masui, Yu-Chen Shen, Danielle Russell Chamberlin, Peter Josef Schmidt
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Publication number: 20220238766Abstract: An array of phosphor pixels is positioned on an array of semiconductor LED pixels with thermally curable adhesive between them. Selected LED pixels of the array are electrically activated; resulting heat cures the adhesive to attach the corresponding phosphor pixel to the activated LED pixel and to release the corresponding phosphor pixel from a carrier. Removal of the carrier removes unattached phosphor pixels, leaving behind phosphor pixels attached to the LED pixels that were activated. The process can be repeated for phosphor pixels of different colors.Type: ApplicationFiled: April 12, 2022Publication date: July 28, 2022Applicant: Lumileds LLCInventors: Emma DOHNER, Kentaro SHIMIZU, Hisashi MASUI
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Publication number: 20220238767Abstract: An array of phosphor pixels is positioned on an array of semiconductor LED pixels with thermally curable adhesive between them. Selected LED pixels of the array are electrically activated; resulting heat cures the adhesive to attach the corresponding phosphor pixel to the activated LED pixel and to release the corresponding phosphor pixel from a carrier. Removal of the carrier removes unattached phosphor pixels, leaving behind phosphor pixels attached to the LED pixels that were activated. The process can be repeated for phosphor pixels of different colors.Type: ApplicationFiled: April 13, 2022Publication date: July 28, 2022Applicant: Lumileds LLCInventors: Emma DOHNER, Kentaro SHIMIZU, Hisashi MASUI
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Patent number: 11217734Abstract: Patterned ceramic wavelength-converting phosphor structures may be bonded to an LED to form a pcLED. The phosphor structures are patterned with features that provide enhanced oxygen permeability to an adhesive bond used to attach the phosphor structure to the LED. The enhanced oxygen permeability reduces transient degradation of the pcLED occurring in the region of the adhesive bond.Type: GrantFiled: October 11, 2019Date of Patent: January 4, 2022Assignee: Lumileds LLCInventors: Kentaro Shimizu, Hisashi Masui, Marcel Rene Bohmer, Vernon Wong