Patents by Inventor Kyouhei Yamada

Kyouhei Yamada 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).

  • Patent number: 11022842
    Abstract: A planar light source device has: a housing, a substrate, a plurality of light-emitting devices each having a light-emitting element and a light-beam control member; and a light diffusing member. The housing has: a bottom surface and two inclined surfaces. In the light distribution characteristics of a light-emitting device, a light ray with the largest angle relative to the optical axis in an angular range within which a luminous intensity equal to or more than 70% of the maximum luminous intensity is exhibited reaches the inclined surfaces. A first angle between the optical axis of the light-emitting element and a light ray having the maximum luminous intensity emitted from the light-emitting device is larger than a second angle between the optical axis of the light-emitting element and a straight line connecting the luminescence center of the light-emitting element to the opening-side end portion of the housing.
    Type: Grant
    Filed: December 5, 2017
    Date of Patent: June 1, 2021
    Assignee: Enplas Corporation
    Inventors: Ryo Nonaka, Kyouhei Yamada
  • Publication number: 20210131641
    Abstract: A light flux control member comprises a surface of incidence, which is the inner surface of a concave portion disposed on the back side, having an inner side surface and an inner ceiling surface; two reflective surfaces disposed on the front side, whereby a portion of the light incident on at least the inner ceiling surface is reflected in two directions, which are approximately perpendicular to the optical axis of the light-emitting element; and two light emission surfaces, disposed with the two reflective surfaces therebetween, wherefrom the light reflected by the two reflective surfaces and the light incident on the inner side surface are respectively emitted to the exterior. Each of the two light emission surfaces has, disposed in a region reached directly by light incident on either of the inner side surfaces, a first sloped surface that approaches the optical axis as the X-axis is approached.
    Type: Application
    Filed: February 15, 2018
    Publication date: May 6, 2021
    Inventor: Kyouhei YAMADA
  • Publication number: 20210072596
    Abstract: According to the present invention, a luminous flux control member of a light emitting device has an incident surface, a back surface, a reflection surface, an emission surface, and a first recessed portion. The first recessed portion includes a first inclined surface. With respect to a direction along the optical axis, a front end of the first inclined surface is positioned further toward the back side than light which is emitted from the center of a light emitting surface of a light emitting element, incident on the incident surface, reflected from the reflection surface, and transmitted toward the emission surface, and is positioned further toward the front side than light which is directly transmitted toward the emission surface without being emitted from an end on the light emitting surface of the light emitting element, incident on the incident surface, and passing by the reflection surface.
    Type: Application
    Filed: August 15, 2018
    Publication date: March 11, 2021
    Applicant: Enplas Corporation
    Inventors: Kyouhei YAMADA, Masayo TAKIZAWA
  • Patent number: 10802338
    Abstract: A light flux control member has: a rear surface extending in the Y-axis direction; and a first incident plane, a second incident plane, and a third incident plane disposed on the rear surface side, said third incident plane reflecting light incident to the first incident plane. The light flux control member further has: a first reflecting plane disposed on the front side and reflecting, to one direction in the Y-axis direction, light incident to the first incident plane, light incident to the first incident plane and reflected on the third incident plane, and light incident to the third incident plane; and a second reflecting plane for reflecting light incident to the second incident plane to the other direction in the Y-axis direction. The light flux control member still further has two exit planes disposed sandwiching the first reflecting plane and the second reflecting plane and facing each other.
    Type: Grant
    Filed: March 20, 2018
    Date of Patent: October 13, 2020
    Assignee: ENPLAS CORPORATION
    Inventor: Kyouhei Yamada
  • Publication number: 20200319511
    Abstract: The luminous intensity of light which is emitted from the light-emitting device and of which the angle with respect to the optical axis has the absolute value of from 0 to 60° is not more than 1.5% with respect to the maximum luminous intensity of light emitted from the light-emitting device. An angular range in which light of a luminous intensity of not less than 70% of the maximum luminous intensity is emitted, the absolute value of the maximum angle with respect to the optical axis is ?, an output surface is disposed so as to intersect a straight line of which the major angle, among the angles formed by the optical axis and a straight line passing a bottom surface-side end portion of the inclined surface and intersecting the optical axis, is not less than ?.
    Type: Application
    Filed: October 26, 2018
    Publication date: October 8, 2020
    Applicant: Enplas Corporation
    Inventors: Takahiro IZAWA, Kyouhei YAMADA
  • Publication number: 20200225536
    Abstract: A planar light source device has: a housing, a substrate, a plurality of light-emitting devices each having a light-emitting element and a light-beam control member; and a light diffusing member. The housing has: a bottom surface and two inclined surfaces. In the light distribution characteristics of a light-emitting device, a light ray with the largest angle relative to the optical axis in an angular range within which a luminous intensity equal to or more than 70% of the maximum luminous intensity is exhibited reaches the inclined surfaces. A first angle between the optical axis of the light-emitting element and a light ray having the maximum luminous intensity emitted from the light-emitting device is larger than a second angle between the optical axis of the light-emitting element and a straight line connecting the luminescence center of the light-emitting element to the opening-side end portion of the housing.
    Type: Application
    Filed: December 5, 2017
    Publication date: July 16, 2020
    Applicant: Enplas Corporation
    Inventors: Ryo NONAKA, Kyouhei YAMADA
  • Publication number: 20200050057
    Abstract: A light flux control member has: a rear surface extending in the Y-axis direction; and a first incident plane, a second incident plane, and a third incident plane disposed on the rear surface side, said third incident plane reflecting light incident to the first incident plane. The light flux control member further has: a first reflecting plane disposed on the front side and reflecting, to one direction in the Y-axis direction, light incident to the first incident plane, light incident to the first incident plane and reflected on the third incident plane, and light incident to the third incident plane; and a second reflecting plane for reflecting light incident to the second incident plane to the other direction in the Y-axis direction. The light flux control member still further has two exit planes disposed sandwiching the first reflecting plane and the second reflecting plane and facing each other.
    Type: Application
    Filed: March 20, 2018
    Publication date: February 13, 2020
    Inventor: Kyouhei YAMADA
  • Patent number: 10190730
    Abstract: A light beam control member according to the present invention comprises: an incidence surface including a first incidence surface arranged spaced apart from a center axis, and a second incidence surface arranged by surrounding the first incidence surface; an upper total reflection surface arranged opposite the incidence surface, and causing the light incident on the incidence surface to reflect in a direction away from the center axis; a lower total reflection surface arranged between the center axis and the first incidence surface and surrounding the center axis, and causing part of the light incident on the first incidence surface to reflect toward the upper total reflection surface; and an emission surface arranged outside the upper total reflection surface and surrounding the center axis, and causing the light reflected from the upper total reflection surface to be emitted to the outside.
    Type: Grant
    Filed: April 21, 2016
    Date of Patent: January 29, 2019
    Assignee: ENPLAS CORPORATION
    Inventors: Kyouhei Yamada, Akinobu Seki, Masayo Takizawa
  • Patent number: 10018330
    Abstract: This light flux control member comprises: two entry surfaces disposed on two sides of a virtual plane serving as a boundary and containing the optical axis of the light-emitting element; a first protruding strip disposed between the two entry surfaces and along the virtual plane, into which light that has exited the light-emitting element enters; two total reflection surfaces, each formed at a position facing the light-emitting element with one of the entry surfaces sandwiched therebetween; two light-guide portions disposed at opposite positions with the first protruding strip sandwiched therebetween; and an exit surface formed on the external surface of each of the light-guide portions. A second light flux control member is disposed so as to cover the first protruding strip and includes a diffuse transmission portion whereby light that has entered and exited the first protruding strip is transmitted while being diffused.
    Type: Grant
    Filed: June 24, 2015
    Date of Patent: July 10, 2018
    Assignee: ENPLAS CORPORATION
    Inventor: Kyouhei Yamada
  • Patent number: 10007050
    Abstract: A light redirecting member includes an incidence surface; a first total reflection surface, two light guiding parts; two second total reflection surfaces disposed at respctivee end portions of the two light guiding parts such that a distance between the second total reflection surface and a virtual plane increases as the second total reflection surface extends from the end portions; and two emission surfaces. The virtual plane includes the optical axis and a first virtual line which intersects the optical axis and extends in an extending direction of the two light guiding parts, the two second total reflection surfaces being surfaces on which light which is incident on the incidence surface and directly reaches the two second total reflection surfaces is incident at an angle equal to or greater than a critical angle, the two second total reflection surfaces being configured to reflect the light.
    Type: Grant
    Filed: November 8, 2016
    Date of Patent: June 26, 2018
    Assignee: ENPLAS CORPORATION
    Inventor: Kyouhei Yamada
  • Publication number: 20180149338
    Abstract: This surface light source is provided with a light diffusing plate and a plurality of light emitting devices. The plurality of light emitting devices each include a plurality of light emitting elements that are aligned in the second direction and have mutually different colors of emitted light, and a luminous flux control member that controls the distribution of the light emitted from the plurality of light emitting elements. The luminous flux control member includes an incident surface, total reflection surfaces, and two light guiding sections. The arrangement order of the plurality of light emitting elements in a given light emitting device differs from the arrangement order of the plurality of light emitting elements in another light emitting device adjacent thereto in the first direction or the second direction.
    Type: Application
    Filed: April 21, 2016
    Publication date: May 31, 2018
    Inventor: Kyouhei YAMADA
  • Publication number: 20180128430
    Abstract: A light beam control member according to the present invention comprises: an incidence surface including a first incidence surface arranged spaced apart from a center axis, and a second incidence surface arranged by surrounding the first incidence surface; an upper total reflection surface arranged opposite the incidence surface, and causing the light incident on the incidence surface to reflect in a direction away from the center axis; a lower total reflection surface arranged between the center axis and the first incidence surface and surrounding the center axis, and causing part of the light incident on the first incidence surface to reflect toward the upper total reflection surface; and an emission surface arranged outside the upper total reflection surface and surrounding the center axis, and causing the light reflected from the upper total reflection surface to be emitted to the outside.
    Type: Application
    Filed: April 21, 2016
    Publication date: May 10, 2018
    Inventors: Kyouhei YAMADA, Akinobu SEKI, Masayo TAKIZAWA
  • Publication number: 20170254512
    Abstract: This light flux control member comprises: two entry surfaces disposed on two sides of a virtual plane serving as a boundary and containing the optical axis of the light-emitting element; a first protruding strip disposed between the two entry surfaces and along the virtual plane, into which light that has exited the light-emitting element enters; two total reflection surfaces, each formed at a position facing the light-emitting element with one of the entry surfaces sandwiched therebetween; two light-guide portions disposed at opposite positions with the first protruding strip sandwiched therebetween; and an exit surface formed on the external surface of each of the light-guide portions. A second light flux control member is disposed so as to cover the first protruding strip and includes a diffuse transmission portion whereby light that has entered and exited the first protruding strip is transmitted while being diffused.
    Type: Application
    Filed: June 24, 2015
    Publication date: September 7, 2017
    Inventor: Kyouhei YAMADA
  • Publication number: 20170131458
    Abstract: A light flux controlling member includes: an incidence surface; a first total reflection surface, and two light guiding parts; two second total reflection surfaces disposed at respective end portions of the two light guiding parts and formed such that a distance between the second total reflection surface and a virtual plane increases as the second total reflection surface extends from the end portions, the virtual plane including the optical axis and a first virtual line which intersects the optical axis and extends in an extending direction of the two light guiding parts, the two second total reflection surfaces being surfaces on which light which is incident on the incidence surface and directly reaches the two second total reflection surfaces is incident at an angle equal to or greater than a critical angle, the two second total reflection surfaces being configured to reflect the light; and two emission surfaces.
    Type: Application
    Filed: November 8, 2016
    Publication date: May 11, 2017
    Inventor: Kyouhei YAMADA
  • Patent number: 9329322
    Abstract: A luminous flux control member (200) of the present invention has: a light input surface (210); total reflection surfaces (220), which are formed at positions facing a light emitting element with the light input surface (210) therebetween; two light guide sections (230), which are formed such that respective cross-sectional areas thereof are reduced in the direction to be away from the light input surface (210) and the total reflection surface (220), said light guide sections being formed at facing positions with the light input surface (210) and the total reflection surface (220) therebetween; and two light output surfaces (240), which are formed on the outer surfaces of the two light guide sections (230), respectively.
    Type: Grant
    Filed: April 16, 2013
    Date of Patent: May 3, 2016
    Assignee: Enplas Corporation
    Inventors: Kyouhei Yamada, Noriyuki Kawahara
  • Patent number: 9297511
    Abstract: A member for controlling luminous flux (100) has an incidence surface (110) and an emitting surface (120). The incidence surface (110) is a pyramidal surface having a recessed shape relative to the bottom of the member for controlling luminous flux (100), and having rounded borders between the individual facets. The horizontal cross-section of the incidence surface (110) is substantially similar in shape to that of an n-hedral irradiated surface (410). In the horizontal cross-section of the emitting surface (120), each of the straight lines connecting together adjacent angles of the n angles that correspond to the n angles of the irradiated surface (410) is substantially parallel to the side that corresponds to the horizontal cross-section of the incidence surface (110). The horizontal cross-section of the emitting surface (120) is the same as the n-hedron formed by the straight lines in the cross section, or fits inside the n-hedron.
    Type: Grant
    Filed: June 8, 2012
    Date of Patent: March 29, 2016
    Assignee: Enplas Corporation
    Inventors: Kyouhei Yamada, Noriyuki Kawahara
  • Publication number: 20150070930
    Abstract: A luminous flux control member (200) of the present invention has: a light input surface (210); total reflection surfaces (220), which are formed at positions facing a light emitting element with the light input surface (210) therebetween; two light guide sections (230), which are formed such that respective cross-sectional areas thereof are reduced in the direction to be away from the light input surface (210) and the total reflection surface (220), said light guide sections being formed at facing positions with the light input surface (210) and the total reflection surface (220) therebetween; and two light output surfaces (240), which are formed on the outer surfaces of the two light guide sections (230), respectively.
    Type: Application
    Filed: April 16, 2013
    Publication date: March 12, 2015
    Applicant: Enplas Corporation
    Inventors: Kyouhei Yamada, Noriyuki Kawahara
  • Patent number: 8926156
    Abstract: A light-emitting device combining a first luminous flux control member having a total reflection surface and emitting light from an emission surface in a narrow angle range centered mainly on an optical axis, and a second luminous flux control member arranged to surround the total reflection surface of the first luminous flux control member. The second luminous flux control member (102) of the light-emitting device is provided with a second incidence surface (126a) and a second emitting surface (126b). Of the light emitted from the light-emitting element (200), the light incident to the second incidence surface (126a) is within a range of angles ? larger than a largest angle to the optical axis of the light incident to the first luminous flux control member (101).
    Type: Grant
    Filed: July 29, 2011
    Date of Patent: January 6, 2015
    Assignee: Enplas Corporation
    Inventors: Akinobu Seki, Hiroshi Takatori, Kyouhei Yamada, Masato Nakamura, Masayo Takizawa, Noriyuki Kawahara
  • Publication number: 20140376217
    Abstract: An illuminating apparatus (100) has: a light source unit (140), which includes a light emitting element (110), and a luminous flux control member (120); a columnar light guide rod (160), which is composed of a transparent material; and a cover (170), which is disposed to cover the light source unit (140) and the light guide rod (160), said cover being disposed with respect to the light source unit (140) and the light guide rod (160) with an air layer therebetween. The light source unit (140) is disposed such that an output surface (126) of the luminous flux control member (120) faces an end surface (162) of the light guide rod (160).
    Type: Application
    Filed: January 17, 2013
    Publication date: December 25, 2014
    Inventors: Kyouhei Yamada, Noriyuki Kawahara
  • Patent number: 8777458
    Abstract: Disclosed is a light emitting device to reduce the number of components and elements of a light emitting device and a lighting device having the light emitting device, and simplify and miniaturize the structures of these devices. With this light flux controlling member (4), a total reflecting surface (12) functions like a reflecting member, light from a light emitting element (LED, for example) (3) that is incident from an input surface (13) and that arrives at the total reflecting surface (12) is total-reflected by the total reflecting surface (12) toward the output surface (11) side (including a first output surface (11a) and second output surface (11b)), and the illuminating light from the second output surface (11b) is superimposed upon the illuminating light from the first output surface (11a), so that the light from the light emitting element (LED, for example) (3) is used efficiently and illuminates the illumination target surface (6) over a wide range.
    Type: Grant
    Filed: March 30, 2011
    Date of Patent: July 15, 2014
    Assignee: Enplas Corporation
    Inventors: Akinobu Seki, Kyouhei Yamada, Noriyuki Kawahara, Hiroshi Takatori