Patents Assigned to NEC Lighting, Ltd.
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Publication number: 20150125977Abstract: An organic EL light emitting device includes a transparent substrate, a transparent electrode film formed on the substrate, a positive electrode contact portion in contact with a part of the transparent electrode film and electrically connected therewith, an insulating layer formed on the transparent electrode film such that the an insulating layer covers a portion excluding a light emitting part, an organic light emitting layer formed on the transparent electrode film and on the insulating layer, a negative electrode film formed on the organic light emitting layer, a negative electrode contact portion in contact with at least a part of the negative electrode film and electrically connected therewith, and a protective layer for separating and electrically insulating the positive electrode contact portion and the transparent electrode film from the negative electrode contact portion.Type: ApplicationFiled: January 13, 2015Publication date: May 7, 2015Applicant: NEC LIGHTING, LTD.Inventor: Yoshikazu SAKAGUCHI
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Patent number: 8969860Abstract: The present invention addresses the problem of providing an organic electroluminescent lighting device in which it is difficult for an organic light emitting film to be scratched.Type: GrantFiled: December 26, 2011Date of Patent: March 3, 2015Assignee: NEC Lighting, Ltd.Inventor: Yoshikazu Sakaguchi
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Patent number: 8963144Abstract: An organic EL light emitting device includes a transparent substrate, a transparent electrode film formed on the substrate, a positive electrode contact portion in contact with a part of the transparent electrode film and electrically connected therewith, an insulating layer formed on the transparent electrode film such that the an insulating layer covers a portion excluding a light emitting part, an organic light emitting layer formed on the transparent electrode film and on the insulating layer, a negative electrode film formed on the organic light emitting layer, a negative electrode contact portion in contact with at least a part of the negative electrode film and electrically connected therewith, and a protective layer for separating and electrically insulating the positive electrode contact portion and the transparent electrode film from the negative electrode contact portion.Type: GrantFiled: March 29, 2012Date of Patent: February 24, 2015Assignee: NEC Lighting, Ltd.Inventor: Yoshikazu Sakaguchi
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Patent number: 8845379Abstract: Anodes of a plurality of organic EL elements are connected together. A forward bias voltage relative to the potential of anodes and a reverse bias voltage are alternately applied to cathodes of the plurality of organic EL elements at a predetermined period. The ratio of the time for which the reverse bias voltage is applied and the time for which the forward bias voltage is applied is increased.Type: GrantFiled: April 27, 2011Date of Patent: September 30, 2014Assignee: NEC Lighting, Ltd.Inventor: Yoshikazu Sakaguchi
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Patent number: 8754408Abstract: In the organic EL illumination device including m (m is an integer greater than 1) series circuits each of which includes n (n is an integer greater than 1) organic EL panels connected in series, each of the organic EL panels is provided with one organic EL element, a positive electrode and a negative electrode, the m series circuits are connected in parallel between the positive electrode and the negative electrode, and among the organic EL panels in the m series circuits, the organic EL panels having the same place in series connections in the direction from the positive electrode to the negative electrode are connected with each other in parallel.Type: GrantFiled: April 26, 2011Date of Patent: June 17, 2014Assignee: NEC Lighting, Ltd.Inventor: Yoshikazu Sakaguchi
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Publication number: 20140139227Abstract: A light emitting element circuit includes a light emitting element (1), a current supply path to the light emitting element (1), a constant current circuit (2) that supplies a current to the light emitting element (1) via the current supply path, and an electric discharge path that discharges an electric charge accumulated at the light emitting element (1) and at a region connected between the both electrodes when the constant current circuit (2) stops a current supply to the light emitting element (1). A light emitting element failure detector (4) that detects a short-circuit of the light emitting element (1) in a light emitting element circuit includes a current instantaneous interruption circuit (5), a voltage detector (60), and a determiner (62).Type: ApplicationFiled: June 28, 2012Publication date: May 22, 2014Applicant: NEC LIGHTING, LTD.Inventor: Toshiya Iwakiri
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Publication number: 20140132273Abstract: A light emitting element failure detector (4) includes a light emitting element (1), a constant current circuit (2) which supplies an electric current to the light emitting element (1), and an electric discharge path which discharges an electric charge such as the light emitting element (1). A light emitting element failure detector (4) further includes an instantaneous current interruption circuit (5) which instantaneously interrupts an electric current to the light emitting element (1) by a current supply path different from the electric discharge path, a diode (60), a DC power supply (61), and a current detector (62). The DC power supply (61) generates a direct-current reference voltage having a positive value lower than a voltage between the anode and cathode of the light emitting element (1) in a normal state. The DC power supply (61), the diode (60), and the current detector (62) which are connected in series constitute a parallel electric path of the light emitting element (1).Type: ApplicationFiled: June 28, 2012Publication date: May 15, 2014Applicant: NEC LIGHTING, LTD.Inventors: Toshiya Iwakiri, Shigeki Taniguchi
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Patent number: 8659220Abstract: An organic electroluminescent lighting device includes: a pair of rectangular electrode films stacked to face each other sandwiching an organic light-emitting element, and different from each other in polarity; wherein a first electrode film includes power supply terminal sections which are each of edge sides which face each other at a surface of the first electrode film; and auxiliary electrode film group including at least one of a plurality of first auxiliary electrode films and a plurality of second auxiliary electrode films located away from each other on the surface of the first electrode film. A sectional area viewed where the plurality of first auxiliary electrode films cuts perpendicularly to the edge sides increases relative to increasing distance from the edge sides. A sectional area viewed where the plurality of second auxiliary electrode films cuts parallel to the edge sides increases relative to increasing distance from the edge sides.Type: GrantFiled: May 20, 2011Date of Patent: February 25, 2014Assignee: NEC Lighting, Ltd.Inventor: Yoshikazu Sakaguchi
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Publication number: 20140042899Abstract: [Problem to be Solved] Provided is a red emitting fluorescent material, which has a large excitation band and which is capable of efficiently emitting red fluorescence when excited by light emitted from an ultraviolet light emitting device and a blue light emitting device serving as an excitation source, in particular, even by use of an ultraviolet LED having an emission peak at near 390 nm to 400 nm, and which is capable of emitting red fluorescence when excited not only by ultraviolet and blue light from an ultraviolet light emitting device and a blue light emitting device but also by fluorescence emitted from a fluorescent material upon receipt these light beams, thereby emitting high brightness red light, and then, provided is a white light emitting device capable of emitting white light having excellent color reproducing and rendering properties.Type: ApplicationFiled: October 23, 2013Publication date: February 13, 2014Applicant: NEC LIGHTING, LTDInventor: Ryo YOSHIMATSU
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Publication number: 20140014939Abstract: An organic EL light emitting device includes a transparent substrate, a transparent electrode film formed on the substrate, a positive electrode contact portion in contact with a part of the transparent electrode film and electrically connected therewith, an insulating layer formed on the transparent electrode film such that the an insulating layer covers a portion excluding a light emitting part, an organic light emitting layer formed on the transparent electrode film and on the insulating layer, a negative electrode film formed on the organic light emitting layer, a negative electrode contact portion in contact with at least a part of the negative electrode film and electrically connected therewith, and a protective layer for separating and electrically insulating the positive electrode contact portion and the transparent electrode film from the negative electrode contact portion.Type: ApplicationFiled: March 29, 2012Publication date: January 16, 2014Applicant: NEC LIGHTING, LTD.Inventor: Yoshikazu Sakaguchi
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Patent number: 8563112Abstract: This invention provides an organic EL light-emitting device, which can prevent the occurrence of brightness unevenness due to resistance of a transparent electrode, in a large surface light-emitting panel of an organic EL element. The organic EL light-emitting device includes an element formation substrate 1, on which an organic EL element 2 including an organic light-emitting layer is stacked, and a sealing substrate 3 for sealing the organic EL element so as to accommodate the organic EL element between the element formation substrate and the sealing substrate. A sealing portion 4 formed of an adhesive is formed in the peripheral edge portion between the element formation substrate 1 and the sealing substrate 3, and a grease layer 5 or a gel layer 5 is accommodated in between the element formation substrate, on which the organic EL element surrounded by the sealing portion is formed, and the plate-shaped sealing substrate so as to adhere to the element formation substrate and the sealing substrate.Type: GrantFiled: April 28, 2009Date of Patent: October 22, 2013Assignees: Yamagata Promotional Organization for Industrial Technology, NEC Lighting, Ltd.Inventors: Joji Suzuki, Fujio Kajikawa, Yasuki Kawashima, Shigeyuki Nakai
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Publication number: 20130234127Abstract: The present invention addresses the problem of providing an organic electroluminescent lighting device in which it is difficult for an organic light emitting film to be scratched.Type: ApplicationFiled: December 26, 2011Publication date: September 12, 2013Applicant: NEC LIGHTING, LTD.Inventor: Yoshikazu Sakaguchi
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Patent number: 8475007Abstract: A light emitting device comprises a light emitting element disposed within a space surrounded by a reflective surface of a reflector disposed on a board. A lower portion of the reflector is placed within a recess formed in the board, and a side wall of the recess is interposed between the lower end of the reflective surface of the reflector and the light emitting element.Type: GrantFiled: May 7, 2009Date of Patent: July 2, 2013Assignee: NEC Lighting, LtdInventors: Yoshinori Ueji, Shusaku Kon
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Patent number: 8446086Abstract: Provided is a fluorescent lamp electrode, having excellent sputtering resistance and able to retain excellent dark-start characteristics over a long period of time when used as an electrode in a cold cathode fluorescent lamp, and which can be produced inexpensively. A fluorescent lamp of this invention has a prolonged life resulting from the use of said electrode. Said electrode is made by dispersing in a nickel or nickel alloy base one or more rare earth metals selected from among lanthanum, cerium, yttrium, samarium, praseodymium, niobium, europium and gadolinium in the form of a precipitated boride phase.Type: GrantFiled: May 29, 2009Date of Patent: May 21, 2013Assignees: NEC Lighting, Ltd., Sumitomo Metal Mining Co., Ltd.Inventors: Toshikazu Sugimura, Tatsuya Takahashi, Isao Kawanishi, Nobuki Mori, Akikazu Tanaka
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Publication number: 20130093316Abstract: An organic electroluminescent lighting device includes: a pair of rectangular electrode films stacked to face each other sandwiching an organic light-emitting element, and different from each other in polarity; wherein a first electrode film includes power supply terminal sections which are each of edge sides which face each other at a surface of the first electrode film; and auxiliary electrode film group including at least one of a plurality of first auxiliary electrode films and a plurality of second auxiliary electrode films located away from each other on the surface of the first electrode film. A sectional area viewed where the plurality of first auxiliary electrode films cuts perpendicularly to the edge sides increases relative to increasing distance from the edge sides. A sectional area viewed where the plurality of second auxiliary electrode films cuts parallel to the edge sides increases relative to increasing distance from the edge sides.Type: ApplicationFiled: May 20, 2011Publication date: April 18, 2013Applicant: NEC LIGHTING, LTD.Inventor: Yoshikazu Sakaguchi
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Patent number: 8421334Abstract: A surface light-emitting element radiates light emitted to a side of a surface light-emitting device. The surface light-emitting device includes: a polygonal transparent substrate, and a light-emitting element disposed on one face of the transparent substrate. The light-emitting element is a laminated body including a transparent electrode which is positively charged and functions as an anode, a negative electrode which becomes negatively charged and functions as a cathode opposite the transparent electrode, and a light-emitting layer between the transparent electrode and a negative electrode. Lengths of respective sides and a thickness of the transparent substrate have a relationship that if b denotes the thickness of transparent substrate, dividing the lengths of the respective sides by 4b results in values ranging from 0.5 (inclusive) to 10 (inclusive).Type: GrantFiled: June 18, 2010Date of Patent: April 16, 2013Assignee: NEC Lighting, Ltd.Inventor: Shusaku Kon
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Publication number: 20130072078Abstract: Anodes of a plurality of organic EL elements are connected together. A forward bias voltage relative to the potential of anodes and a reverse bias voltage are alternately applied to cathodes of the plurality of organic EL elements at a predetermined period. The ratio of the time for which the reverse bias voltage is applied and the time for which the forward bias voltage is applied is increased.Type: ApplicationFiled: April 27, 2011Publication date: March 21, 2013Applicant: NEC LIGHTING, LTD.Inventor: Yoshikazu Sakaguchi
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Publication number: 20130056721Abstract: In the organic EL illumination device including m (m is an integer greater than 1) series circuits each of which includes n (n is an integer greater than 1) organic EL panels connected in series, each of the organic EL panels is provided with one organic EL element, a positive electrode and a negative electrode, the m series circuits are connected in parallel between the positive electrode and the negative electrode, and among the organic EL panels in the m series circuits, the organic EL panels having the same place in series connections in the direction from the positive electrode to the negative electrode are connected with each other in parallel.Type: ApplicationFiled: April 26, 2011Publication date: March 7, 2013Applicant: NEC LIGHTING, LTD.Inventor: Yoshikazu Sakagushi
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Publication number: 20130020963Abstract: The present invention has the object of suppressing variations of luminance and chromaticity among a plurality of organic EL elements. An illumination device includes: a plurality of organic EL elements; an operation unit that receives, for each organic EL element, chromaticity information that indicates chromaticity of the relevant organic EL element and luminance information that indicates the luminance of the relevant organic EL element; and a supply unit that, for each of the organic EL elements, supplies to an organic EL element a drive signal having amplitude that accords with the chromaticity indicated by the chromaticity information for that organic EL element for, within a unit time interval, a time interval that accords with luminance indicated by the luminance information for that organic EL element.Type: ApplicationFiled: April 28, 2011Publication date: January 24, 2013Applicant: NEC LIGHTING, LTD.Inventor: Yoshikazu Sakaguchi
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Publication number: 20130002126Abstract: The present invention is to provide an organic electroluminescent lighting device that can reduce the occurrence of short-circuiting caused by inrush current. The organic electroluminescent lighting device includes: transparent substrate 1; positive electrode film 2 that is formed on the surface of transparent substrate 1 and includes terminal 2a formed at one end or both ends and electrode 2b formed continuously from terminal 2a; negative electrode terminal film 3 that is formed separate from positive electrode film 2 on the surface of transparent substrate 1 and includes first resistive region 7; organic light emitting film 4 formed on the surface of electrode 2b of positive electrode film 2; and negative electrode film 5 continuously formed from the surface of organic light emitting film 4 to the surface of negative electrode terminal film 3.Type: ApplicationFiled: April 26, 2011Publication date: January 3, 2013Applicant: NEC LIGHTING, LTD.Inventor: Yoshikazu Sakaguchi