Patents by Inventor Kenzo Ohkubo
Kenzo Ohkubo 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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Publication number: 20230296869Abstract: An optical scanning unit steers a light beam emitted from a laser diode in the main scanning direction by a polygon mirror. The laser diode, a collimator lens, an aperture, a first lens, the polygon mirror, and a condensing lens are sequentially placed in the optical system of the optical scanning unit. The laser diode emits a light beam in which divergent angles in intersecting two directions are different from each other. The direction in which the light beam divergent angle is large is aligned with the sub-scanning direction, and the direction in which the light beam divergent angle is small is aligned with the main scanning direction. The first lens has a first function to condense a beam in the sub-scanning direction and a second function to diffuse a beam in the main scanning direction.Type: ApplicationFiled: March 10, 2023Publication date: September 21, 2023Inventors: Hidenori SATO, HIROSHI YAMAMOTO, KENZO OHKUBO, TAKAHARU MOTOYAMA
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Patent number: 11681239Abstract: An optical member that refracts a light beam to diverge or focus the light beam, includes: at least three pairs of opposing surfaces. Each of the three pairs of opposing surfaces include a lens. Curvatures of the lenses at one side surfaces of the respective three pairs of surfaces are all the same, or curvatures of the lenses at one side surfaces of respective pairs of at least two pairs of the three pairs of surfaces are different from each other, and respective shortest distances between optical axes of the lenses at the one side surfaces of respective pairs of the at least two pairs of surfaces, and reference sides which are each any one of respective sides surrounding surfaces including the lenses are different from each other.Type: GrantFiled: April 9, 2021Date of Patent: June 20, 2023Assignee: SHARP KABUSHIKI KAISHAInventors: Kenzo Ohkubo, Manabu Matsuo, Takaharu Motoyama
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Publication number: 20210349408Abstract: An optical member that refracts a light beam to diverge or focus the light beam, includes: at least three pairs of opposing surfaces. Each of the three pairs of opposing surfaces include a lens. Curvatures of the lenses at one side surfaces of the respective three pairs of surfaces are all the same, or curvatures of the lenses at one side surfaces of respective pairs of at least two pairs of the three pairs of surfaces are different from each other, and respective shortest distances between optical axes of the lenses at the one side surfaces of respective pairs of the at least two pairs of surfaces, and reference sides which are each any one of respective sides surrounding surfaces including the lenses are different from each other.Type: ApplicationFiled: April 9, 2021Publication date: November 11, 2021Inventors: KENZO OHKUBO, MANABU MATSUO, TAKAHARU MOTOYAMA
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Patent number: 10735613Abstract: In a light scanning device, a substrate equipped with a polygonal mirror is disposed astride an interior section and an exposed section of a housing. The substrate is provided with a separator that comes into contact with a front face thereof. The separator separates the substrate into a first region disposed in the interior section and a second region disposed in the exposed section. The polygonal mirror is provided in the second region of the substrate.Type: GrantFiled: December 11, 2018Date of Patent: August 4, 2020Assignee: SHARP KABUSHIKI KAISHAInventor: Kenzo Ohkubo
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Publication number: 20190199881Abstract: In a light scanning device, a substrate equipped with a polygonal mirror is disposed astride an interior section and an exposed section of a housing. The substrate is provided with a separator that comes into contact with a front face thereof. The separator separates the substrate into a first region disposed in the interior section and a second region disposed in the exposed section. The polygonal mirror is provided in the second region of the substrate.Type: ApplicationFiled: December 11, 2018Publication date: June 27, 2019Inventor: KENZO OHKUBO
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Patent number: 9194544Abstract: There are provided a light-emitting device, an illuminating apparatus, and a display apparatus in which, in order to apply light to an object to be illuminated with uniformity in light intensity, the quantity of light which is applied to a part of an edge of a to-be-illuminated region of the to-be-illuminated object located near a light-emitting section can be lessened. A backlight unit includes a printed substrate, a plurality of light-emitting sections each of which has a base support, an LED chip and a lens, and reflective members each of which is placed around the light-emitting section and has a first wall portion and a second wall portion.Type: GrantFiled: June 1, 2012Date of Patent: November 24, 2015Assignee: SHARP KABUSHIKI KAISHAInventors: Yasuhiro Ono, Makoto Masuda, Kenzo Ohkubo, Nobuhiro Shirai, Tetsushi Ito, Takasumi Wada
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Publication number: 20150226400Abstract: The invention provides a light-emitting device for use in a backlight unit of a display apparatus including a display panel, which is capable of applying light to an illumination object with uniformity in brightness in the planar direction of the illumination object and can be made lower in profile, as well as an illuminating apparatus and a display apparatus including the light-emitting device. A backlight unit (1) is provided with a printed circuit board (12), a plurality of light-emitting portions (111) disposed on the printed circuit board (12) and having a base support (111b), an LED chip (111a) and a lens (112), and a reflective member (118) disposed around each light-emitting portion (111) and having a first reflecting member (1131) and a second reflecting member (1132).Type: ApplicationFiled: February 27, 2012Publication date: August 13, 2015Applicant: SHARP KABUSHIKI KAISHAInventors: Takasumi Wada, Yasuhiro Ono, Makoto Masuda, Kenzo Ohkubo, Nobuhiro Shirai
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Publication number: 20140376219Abstract: The invention provides a light-emitting device which is capable of applying light to a display panel with uniformity in brightness and can be made lower in profile. A light-emitting device (11) includes an LED chip (111a), a base support (111b) which supports the LED chip (111a), and a lens (112) disposed in contact with the LED chip (111a) so as to cover the LED chip (111a) and the base support (111b). The lens (112) has first curved sections (1122) which reflect light that has reached a top surface (112a) so that the reflected light is emitted from a side surface (112b), and second curved sections (1123) which refract light that has reached the top surface (112a) to outside so that the refracted light is emitted from the top surface (112a).Type: ApplicationFiled: February 27, 2012Publication date: December 25, 2014Applicant: SHARP KABUSHIKI KAISHAInventors: Yasuhiro Ono, Makoto Masuda, Takasumi Wada, Kenzo Ohkubo, Nobuhiro Shirai
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Publication number: 20140226311Abstract: There are provided a light-emitting device for use in a backlight unit of a display apparatus equipped with a display panel, which can be made lower in profile and is capable of applying light to the display panel with uniformity in the brightness of the display panel in the planar direction of the display panel, as well as a display apparatus equipped with the light-emitting device. A backlight unit includes a printed substrate, a plurality of light-emitting sections each having a base support, an LED chip and a lens, and a reflective member surrounding the light-emitting section. A specular reflection portion is formed in a first reflective region of the reflective member.Type: ApplicationFiled: May 22, 2012Publication date: August 14, 2014Applicant: SHARP KABUSHIKI KAISHAInventors: Yasuhiro Ono, Makoto Masuda, Kenzo Ohkubo, Nobuhiro Shirai, Takasumi Wada
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Publication number: 20140160733Abstract: There are provided a light-emitting device, an illuminating apparatus, and a display apparatus in which, in order to apply light to an object to be illuminated with uniformity in light intensity, the quantity of light which is applied to a part of an edge of a to-be-illuminated region of the to-be-illuminated object located near a light-emitting section can be lessened. A backlight unit includes a printed substrate, a plurality of light-emitting sections each of which has a base support, an LED chip and a lens, and reflective members each of which is placed around the light-emitting section and has a first wall portion and a second wall portion.Type: ApplicationFiled: June 1, 2012Publication date: June 12, 2014Applicant: SHARP KABUSHIKI KAISHAInventors: Yasuhiro Ono, Makoto Masuda, Kenzo Ohkubo, Nobuhiro Shirai, Tetsushi Ito, Takasumi Wada
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Publication number: 20140140046Abstract: There are provided a light-emitting device for use in a backlight unit of a display apparatus equipped with a display panel, which can be made lower in profile and is capable of applying light to the display panel with uniformity in the brightness of the display panel in a planar direction of the display panel, as well as a display apparatus equipped with the light-emitting device. A backlight unit includes a plurality of light-emitting devices each having a printed substrate, a base support, an LED chip and a lens, and a reflective member surrounding the light-emitting device. A high-reflection portion is formed in a first reflective region of the reflective member.Type: ApplicationFiled: May 22, 2012Publication date: May 22, 2014Applicant: SHARP KABUSHIKI KAISHAInventors: Yasuhiro Ono, Makoto Masuda, Kenzo Ohkubo, Nobuhiro Shirai, Takasumi Wada
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Publication number: 20140092584Abstract: The invention provides a light-emitting device a light-emitting device for use in a backlight unit of a display apparatus including a display panel, which is capable of applying light to an illumination object with uniformity in brightness in a planar direction of the illumination object and can be made lower in profile. A backlight unit (1) is provided with: a printed circuit board (12); a plurality of light-emitting portions (111) disposed on the printed circuit board (12) and having a base support (111b), an LED chip (111a) and a lens (112); and a first reflective member (118) disposed on a periphery of each light-emitting portion (111) and having a first reflecting portion (1181) and a second reflecting portion (1182).Type: ApplicationFiled: February 27, 2012Publication date: April 3, 2014Applicant: SHARP KABUSHIKI KAISHAInventors: Yasuhiro Ono, Makoto Masuda, Kenzo Ohkubo, Nobuhiro Shirai, Takasumi Wada
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Patent number: 8525863Abstract: An optical scanning device includes an enclosure having a plurality of windows covered with transparent members. The enclosure houses a plurality of light sources, a scanning portion, optical elements and a light amount attenuation portion. The scanning portion deflects each of a plurality of light beams emitted from a plurality of light sources at a constant angular speed in a main scanning direction. The optical elements constitute respective light paths from the scanning portion to the windows for the plurality of light beams, respectively. The light amount attenuation portion attenuates light amount in a light path of a first light source among the plurality of light sources in a downstream side of the position where a light beam emitted from a second light source enters as stray light. The drive portion drives the first light source so as to compensate for light amount attenuated by the light amount attenuation portion.Type: GrantFiled: June 15, 2011Date of Patent: September 3, 2013Assignee: Sharp Kabushiki KaishaInventors: Kenzo Ohkubo, Nobuhiro Shirai, Takasumi Wada
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Publication number: 20130013252Abstract: A backlight unit has a printed circuit board, a plurality of light-emitting portions each including a base, an LED chip, and a lens, and a reflective member surrounding the light-emitting portion. An area ? of a figure defining the contour of the reflective member as planarly viewed in an optical-axis direction parallel to an optical axis of the LED chip is determined on the basis of ?×?/? in which a quantity of light which exits through the transmitting region of the lens is represented by ?, a quantity of light which exits through the entire surface of the lens is represented by ?, and an area of the lens as planarly viewed in the optical-axis direction is represented by ?.Type: ApplicationFiled: June 26, 2012Publication date: January 10, 2013Inventors: Yasuhiro Ono, Makoto Masuda, Kenzo Ohkubo, Nobuhiro Shirai, Takasumi Wada
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Publication number: 20120026267Abstract: In an optical scanning device, a beam outputted from a light source is deflected by an optical deflector, and an object to be scanned (for example, a photosensitive drum) is scanned by the deflected beam. The optical scanning device is provided with a light source that outputs a beam, an aperture provided with an opening that shapes the beam outputted from the light source, a reducing optical portion that reduces the beam shaped by the aperture, and a collimator, which is arranged within an interval from the light source to the reducing optical portion, and makes the beam parallel. The reducing optical portion outputs the incoming beam as a parallel beam. The aperture and the reducing optical portion are arranged within an interval from the light source to the optical deflector.Type: ApplicationFiled: August 1, 2011Publication date: February 2, 2012Inventors: Nobuhiro SHIRAI, Kenzo Ohkubo
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Publication number: 20110310211Abstract: An optical scanning device includes an enclosure having a plurality of windows covered with transparent members. The enclosure houses a plurality of light sources, a scanning portion, optical elements and a light amount attenuation portion. The scanning portion deflects each of a plurality of light beams emitted from a plurality of light sources at a constant angular speed in a main scanning direction. The optical elements constitute respective light paths from the scanning portion to the windows for the plurality of light beams, respectively. The light amount attenuation portion attenuates light amount in a light path of a first light source among the plurality of light sources in a downstream side of the position where a light beam emitted from a second light source enters as stray light. The drive portion drives the first light source so as to compensate for light amount attenuated by the light amount attenuation portion.Type: ApplicationFiled: June 15, 2011Publication date: December 22, 2011Inventors: Kenzo OHKUBO, Nobuhiro Shirai, Takasumi Wada
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Patent number: 7755809Abstract: A laser scanning optical system converts a plurality of beams emitted from the laser diode (LD) into parallel light using a collimator lens, shapes the parallel light using an aperture, and executes exposure of a plurality of lines simultaneously on a photoreceptor drum. To cause a necessary emitting point interval d determined uniquely from the magnification of the optical system to coincide with an emitting point interval of the LD used, the LD is rotated by an angle ? against the main optical axis plane thereof. In this case, a converting device that converts the aspect ratio of a profile of the light beam emitted from the LD is provided. A conversion characteristic of the converting device is adjusted such that the characteristic is matched with a condition within a predetermined region following a characteristic of the optical system.Type: GrantFiled: November 27, 2006Date of Patent: July 13, 2010Assignee: Sharp Kabushiki KaishaInventors: Hirokazu Fujita, Kenzo Ohkubo, Takasumi Wada, Yasuhiro Ono, Takayuki Ohno
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Patent number: 7505187Abstract: According to the present invention, highly accurate adjustment of the angles and positions of optical elements constituting an optical scanning unit can be easily performed. For a cylindrical lens that makes the light beam for exposing a photoreceptor converge on the surface of the photoreceptor, a frame is provided for holding the cylindrical lens therein. The frame is supported by two support portions for a chassis of the optical scanning unit such that the longitudinal direction of the cylindrical lens becomes parallel to the scanning direction of the photoreceptor. The optical scanning unit is configured such that the angle of the cylindrical lens in the longitudinal direction is adjustable in the sub-scanning direction of the photoreceptor at the support portion on the front side (operational side) of these support portions.Type: GrantFiled: May 5, 2006Date of Patent: March 17, 2009Assignee: Sharp Kabushiki KaishaInventors: Ayumu Oda, Masaki Saka, Atsushi Ueda, Yasuhiro Ono, Makoto Masuda, Kenzo Ohkubo
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Publication number: 20070146848Abstract: A laser scanning optical system converts a plurality of beams emitted from the laser diode (LD) into parallel light using a collimator lens, shapes the parallel light using an aperture, and executes exposure of a plurality of lines simultaneously on a photoreceptor drum. To cause a necessary emitting point interval d determined uniquely from the magnification of the optical system to coincide with an emitting point interval of the LD used, the LD is rotated by an angle ? against the main optical axis plane thereof. In this case, a converting device that converts the aspect ratio of a profile of the light beam emitted from the LD is provided. A conversion characteristic of the converting device is adjusted such that the characteristic is matched with a condition within a predetermined region following a characteristic of the optical system.Type: ApplicationFiled: November 27, 2006Publication date: June 28, 2007Inventors: Hirokazu FUJITA, Kenzo Ohkubo, Takasumi Wada, Yasuhiro Ono, Takayuki Ohno
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Publication number: 20060262373Abstract: According to the present invention, highly accurate adjustment of the angles and positions of optical elements constituting an optical scanning unit can be easily performed. For a cylindrical lens that makes the light beam for exposing a photoreceptor converge on the surface of the photoreceptor, a frame is provided for holding the cylindrical lens therein. The frame is supported by two support portions for a chassis of the optical scanning unit such that the longitudinal direction of the cylindrical lens becomes parallel to the scanning direction of the photoreceptor. The optical scanning unit is configured such that the angle of the cylindrical lens in the longitudinal direction is adjustable in the sub-scanning direction of the photoreceptor at the support portion on the front side (operational side) of these support portions.Type: ApplicationFiled: May 5, 2006Publication date: November 23, 2006Inventors: Ayumu Oda, Masaki Saka, Atsushi Ueda, Yasuhiro Ono, Makoto Masuda, Kenzo Ohkubo