Patents by Inventor Masaki Hirohashi
Masaki Hirohashi 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: 7619361Abstract: A discharge lamp device is provided that includes a light source device including a reflective surface. In the light source, noble gas not including mercury is excited to provide stable light emission and ozone or the like is prevented from being generated. This discharge lamp device includes airtight container (10) in which both end sections of a glass bulb are sealed. Airtight container (10) is filled with a discharge medium mainly including noble gas. One end section of airtight container (10) includes first electrode (11). Airtight container (10) is externally attached to insulating holder (20) having a square plate-like shape that includes penetration hole(s) (21) at one or a plurality of position(s). Holder (20) is fitted to second electrode (12) shaped to be a U-like groove so that a fixed interval between airtight container (10) and second electrode (12) is maintained.Type: GrantFiled: January 5, 2005Date of Patent: November 17, 2009Assignee: Panasonic CorporationInventors: Masaki Hirohashi, Nobuhiro Shimizu, Norikazu Yamamoto, Teruaki Shigeta, Yoko Matsubayashi, Yutaka Wakimura, Shuuji Furukawa, Hisashi Dejima
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Publication number: 20090161041Abstract: A light source device includes a plurality of juxtaposed discharge tubes, each of which includes an internal electrode at least at one end, is made of transmissive material, has a phosphor layer formed at the inner side of the discharge tube, and is filled with a discharge gas containing xenon, an external electrode which is conductive and flat-shaped, is spaced from the plurality of discharge tubes by a specific distance, and is connected electrically to the grounding potential, and a conductive member electrically configured to connect the outer surface of all of the plurality of discharge tubes to the external electrode.Type: ApplicationFiled: November 14, 2007Publication date: June 25, 2009Applicant: Matsushita Electric Industrial Co., Ltd.Inventors: Kiyoshi Hashimotodani, Masaki Hirohashi
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Publication number: 20090103007Abstract: A dielectric barrier discharge lamp 100 has an internal electrode 11 inside a bulb 10, and an external electrode 12 outside the bulb 10. Lamp capacity C0 per inner surface area of the bulb between the internal electrode and external electrode is set to less than 2.8 nF/m2. By setting lamp capacity C0 within this range, lamp efficiency ?, which is a value obtained by dividing an output luminous flux of the lamp by an power inputted to the lamp, is remarkably increased.Type: ApplicationFiled: January 25, 2007Publication date: April 23, 2009Inventors: Shinichiro Hataoka, Masaki Hirohashi
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Patent number: 7495376Abstract: A light source device has an internal electrode (24) disposed at an end portion inside a bulb (23), and an external electrode (25) disposed outside the bulb (23). A holder member (27) holds the external electrode (25) so as to be opposed to the bulb (23) with a predetermined spacing (26). A dielectric member (30) is disposed outside the bulb (23), at a position corresponding to the internal electrode (24) so as to be interposed between the bulb (23) and the external electrode (25).Type: GrantFiled: December 9, 2004Date of Patent: February 24, 2009Assignee: Panasonic CorporationInventors: Yoko Matsubayashi, Shinichiro Hataoka, Masaki Hirohashi, Nobuhiro Shimizu, Norikazu Yamamoto, Teruaki Shigeta
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Publication number: 20090046223Abstract: A fluorescent lamp (10) includes a discharge tube which is made of transmissive material, has a phosphor layer formed on the inner surface of the discharge tube and is filled with a discharge gas, a first internal electrode (101a) provided at one end of the discharge tube (102) for applying a rectangular alternating voltage of high frequency, a second internal electrode (101b) provided at the opposite end the discharge tube (102) to the first internal electrode (101a), an external electrode (103) provided along the longitudinal direction of the discharge tube (102). A capacitive element (104) for discharging internal charge is electrically connected to the second internal electrode (101b) outside the discharge tube (102).Type: ApplicationFiled: September 14, 2007Publication date: February 19, 2009Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.Inventors: Kiyoshi Hashimotodani, Masaki Hirohashi
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Publication number: 20080084163Abstract: A dielectric barrier discharge lamp has a high efficiency as well as high brightness. A distance between an external electrode and a gastight container of the dielectric barrier discharge lamp decreases with a distance from an internal electrode in a longitudinal direction of the gastight container. A surface area of the external electrode per unit length thereof decreases with the distance from the internal electrode in the longitudinal direction of the gastight container. The electrostatic capacity formed between the gastight container and the external electrode is substantially constant in the longitudinal direction of the gastight container or decreases with the distance in the longitudinal direction.Type: ApplicationFiled: October 30, 2007Publication date: April 10, 2008Inventors: Shinichiro HATAOKA, Masaki HIROHASHI
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Publication number: 20080084164Abstract: A dielectric barrier discharge lamp has a pair of external electrodes disposed in series along the direction of tube axis outside a bulb. A lamp capacity, which is an electrostatic capacity between the pair of external electrodes, is set such that a discharge charge quantity per unit length of the external electrodes and one discharge between the pair of external electrodes is less than 100 nC/m. The lamp capacity is regulated, for example, by a width or a length of the external electrodes or a clearance distance to the external electrodes and bulb. A high lamp efficiency can be accomplished.Type: ApplicationFiled: October 30, 2007Publication date: April 10, 2008Inventors: Masaki Hirohashi, Shinichiro Hataoka
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Publication number: 20080061699Abstract: A discharge lamp device is provided that includes a light source device including a reflective surface. In the light source, noble gas not including mercury is excited to provide stable light emission and ozone or the like is prevented from being generated. This discharge lamp device includes airtight container (10) in which both end sections of a glass bulb are sealed. Airtight container (10) is filled with a discharge medium mainly including noble gas. One end section of airtight container (10) includes first electrode (11). Airtight container (10) is externally attached to insulating holder (20) having a square plate-like shape that includes penetration hole(s) (21) at one or a plurality of position(s). Holder (20) is fitted to second electrode (12) shaped to be a U-like groove so that a fixed interval between airtight container (10) and second electrode (12) is maintained.Type: ApplicationFiled: January 5, 2005Publication date: March 13, 2008Inventors: Masaki Hirohashi, Nobuhiro Shimizu, Norikazu Yamamoto, Teruaki Shigeta, Yoko Matsubayashi, Yutaka Wakimura, Shuuji Furukawa, Hisashi Dejima
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Publication number: 20070274078Abstract: A light source device has an internal electrode (24) disposed at an end portion inside a bulb (23), and an external electrode (25) disposed outside the bulb (23). A holder member (27) holds the external electrode (25) so as to be opposed to the bulb (23) with a predetermined distance of a space (26). A dielectric member (30) is disposed outside the bulb (23), at a position corresponding to the internal electrode (24) so as to be interposed between the bulb (23) and the external electrode (25).Type: ApplicationFiled: December 9, 2004Publication date: November 29, 2007Inventors: Yoko Matsubayashi, Shinichiro Hataoka, Masaki Hirohashi, Nobuhiro Shimizu, Norikazu Yamamoto, Teruaki Shigeta
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Patent number: 7282861Abstract: A light source device has a bulb, a discharge medium containing rare gas sealed inside the bulb, an internal electrode disposed inside the bulb, and an external electrode disposed outside the bulb. A holder member holds the external electrode so that the external electrode is opposed to the bulb with a predetermined distance of a space therebetween.Type: GrantFiled: February 27, 2006Date of Patent: October 16, 2007Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Masaki Hirohashi, Nobuhiro Shimizu, Norikazu Yamamoto, Teruaki Shigeta, Yoko Matsubayashi
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Publication number: 20060139934Abstract: The light source device has a bulb, a discharge medium containing rare gas sealed inside the bulb, an internal electrode disposed inside the bulb, and an external electrode disposed outside the bulb. A holder member holds the external electrode so that the external electrode is opposed to the bulb with a predetermined distance of a space therebetween.Type: ApplicationFiled: February 27, 2006Publication date: June 29, 2006Inventors: Masaki Hirohashi, Nobuhiro Shimizu, Norikazu Yamamoto, Teruaki Shigeta, Yoko Matsubayashi
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Patent number: 7053871Abstract: A method of driving a gas discharge tube is provided. Each field of images is divided into three periods for luminescence-rest, luminescence-preparing, and luminescence steps. During the luminescence-rest step, two voltages whose amplitudes are the same and constant are applied to two sustaining electrodes composing each pair, so that the sustaining electrodes rest the discharge. During the luminescence-preparing step, two voltage pulses whose phases are the same are applied to the two sustaining electrodes composing each pair and a voltage to cause a preparatory discharge is applied to an auxiliary electrode. And during the luminescence step, two voltage pulses whose phases are mutually shifted are applied to the two sustaining electrodes composing each pair, so that the sustaining electrodes cause discharges for the luminescence.Type: GrantFiled: May 30, 2002Date of Patent: May 30, 2006Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Kazuo Tomida, Masaki Hirohashi, Jun Kuwata, Hiroko Imamura
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Publication number: 20030063050Abstract: Disclosed are a gas discharge tube used for the backlight of a liquid crystal display (LCD) or the like and a drive method for the same. A flat type gas discharge tube comprises two plane glasses, a barrier and at least one electrode group comprised of a plurality of parallel electrodes. Voltages are applied to each electrode group in one discharge period in such a way that discharges of a rare gas dispersed spatially and along the time are allowed to occur. Even when a single gas discharge tube is used for the backlight of an LCD having a large display area, therefore, it does not suffer luminance unevenness and the locations of discharge can be dispersed spatially and along the time, thus ensuring a high emission efficiency. As the backlight does not require a light guide plate or a diffusion sheet, its manufacturing cost becomes lower.Type: ApplicationFiled: September 25, 2002Publication date: April 3, 2003Inventors: Kazuo Tomida, Masaki Hirohashi, Jun Kuwata, Hiroko Imamura
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Publication number: 20020180664Abstract: A method of driving a gas discharge tube is provided. Each field of images is divided into three periods for luminescence-rest, luminescence-preparing, and luminescence steps. During the luminescence-rest step, two voltages whose amplitudes are the same and constant are applied to two sustaining electrodes composing each pair, so that the sustaining electrodes rest the discharge. During the luminescence-preparing step, two voltage pulses whose phases are the same are applied to the two sustaining electrodes composing each pair and a voltage to cause a preparatory discharge is applied to an auxiliary electrode. And during the luminescence step, two voltage pulses whose phases are mutually shifted are applied to the two sustaining electrodes composing each pair, so that the sustaining electrodes cause discharges for the luminescence.Type: ApplicationFiled: May 30, 2002Publication date: December 5, 2002Applicant: Matsushita Electric Industrial Co., Ltd.Inventors: Kazuo Tomida, Masaki Hirohashi, Jun Kuwata, Hiroko Imamura