Patents by Inventor Yasuhito Imanishi
Yasuhito Imanishi 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: 7225003Abstract: A mobile phone includes a lower housing having one and and the other end, an upper housing having one end pivotally connected to the lower housing, and an antenna accommodated close to one end of the lower housing. The other end of the upper housing pivots toward and away from the other end of the lower housing. The mobile phone is used in close proximity to a user's head with the other end of the upper housing being distanced from the other end of the lower housing. Upon use, the lower housing is disposed relative to the upper housing so that the upper housing intervenes between the antenna and the user's head.Type: GrantFiled: October 3, 2005Date of Patent: May 29, 2007Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Hideaki Shoji, Takatoshi Katsura, Yoshinori Matsunami, Yasuhito Imanishi, Tetsuya Tanaka, Hirokazu Taketomi
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Patent number: 7079877Abstract: In a foldable portable telephone, a shield box provided within an upper casing is connected via a flexible cable to an output terminal of a transmitting circuit provided within a lower casing, and the shield box is used as an antenna. Thus, compared to the conventional case where a rod antenna is provided at an upper end of the lower casing, variation in gain dependent on a state of the user's hand holding the portable telephone is lessened.Type: GrantFiled: August 27, 2001Date of Patent: July 18, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Hideaki Shoji, Yasuhito Imanishi, Toru Fukasawa, Yasuhiro Nishioka
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Patent number: 7031762Abstract: A mobile phone includes a lower housing having one end and the other end, an upper housing having one end pivotally connected to the lower housing, and an antenna accommodated close to one end of the lower housing. The other end of the upper housing pivots toward and away from the other end of the lower housing. The mobile phone is used in close proximity to a user's head with the other end of the upper housing being distanced from the other end of the lower housing. Upon use, the lower housing is disposed relative to the upper housing so that the upper housing intervenes between the antenna and the user's head.Type: GrantFiled: December 28, 2000Date of Patent: April 18, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Hideaki Shoji, Takatoshi Katsura, Yoshinori Matsunami, Yasuhito Imanishi, Tetsuya Tanaka, Hirokazu Taketomi
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Publication number: 20060025185Abstract: A mobile phone includes a lower housing having one and and the other end, an upper housing having one end pivotally connected to the lower housing, and an antenna accommodated close to one end of the lower housing. The other end of the upper housing pivots toward and away from the other end of the lower housing. The mobile phone is used in close proximity to a user's head with the other end of the upper housing being distanced from the other end of the lower housing. Upon use, the lower housing is disposed relative to the upper housing so that the upper housing intervenes between the antenna and the user's head.Type: ApplicationFiled: October 3, 2005Publication date: February 2, 2006Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventors: Hideaki Shoji, Takatoshi Katsura, Yoshinori Matsunami, Yasuhito Imanishi, Tetsuya Tanaka, Hirokazu Taketomi
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Patent number: 6985110Abstract: An antenna device, a radio communication terminal, an external antenna, and a hand strap can be provided, which are capable of ensuring satisfactory communication performance without being affected by the surrounding environment even in an area where the electric field is weak, and having the antenna performance improved by slightly modifying the body of an existing radio communication device. The antenna device according to the present invention includes an internal antenna (2) electrically connected to and incorporated into a circuit for radio communication within a case (1) and an external antenna (3) externally attached to the case.Type: GrantFiled: August 31, 2001Date of Patent: January 10, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Tetsuya Tanaka, Yonehiko Sunahara, Yasuhito Imanishi, Hirokazu Taketomi, Shigeru Makino, Toru Fukasawa, Yasuhiro Nishioka
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Publication number: 20050079903Abstract: A cell phone including a built-in antenna, the cell phone having a reduced physical size of an antenna element, a decreased weight and satisfying an impact resistance, and suppressing a variation in a dimension caused by mass production and considering an actual use state in which a hand or the like approaches. A dielectric between an antenna element and a ground is a support member of a cyclo-olefin polymer in a plating grade having an impact resistance which is obtained by blending styrene type rubber, polyolefin type rubber (elastomer) or both of them, and the antenna element is constituted by a plating formed on a main surface of the dielectric.Type: ApplicationFiled: April 18, 2002Publication date: April 14, 2005Inventors: Hirokazu Taketomi, Fumiaki Baba, Yonehiko Sunahara, Yasuhito Imanishi, Tetsuya Tanaka
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Publication number: 20050001771Abstract: An antenna device, a radio communication terminal, an external antenna, and a hand strap can be provided, which are capable of ensuring satisfactory communication performance without being affected by the surrounding environment even in an area where the electric field is weak, and having the antenna performance improved by slightly modifying the body of an existing radio communication device. The antenna device according to the present invention includes an internal antenna (2) electrically connected to and incorporated into a circuit for radio communication within a case (1) and an external antenna (3) externally attached to the case.Type: ApplicationFiled: August 31, 2001Publication date: January 6, 2005Inventors: Tetsuya Tanaka, Yonehiko Sunahara, Yasuhito Imanishi, Hirokazu Taketomi, Shigeru Makino, Toru Fukasawa, Yasuhiro Nishioka
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Patent number: 6781550Abstract: The antenna device includes a linear antenna (2, 11, 15), a fixing member (7), and a power feed member (10, 12, 14). The fixing member (7) is formed from a dielectric, and holds a portion (11) of the antenna. The power feed member (12, 10) contacts the antenna (11, 15). The fixing member (7) holds the antenna (2, 11, 15) in a movable manner.Type: GrantFiled: May 30, 2002Date of Patent: August 24, 2004Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Hideaki Shoji, Yasuhito Imanishi, Toru Fukasawa, Hiroyuki Ohmine
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Patent number: 6771223Abstract: An antenna device includes: a conductive board (3) having one end portion and the other end portion opposite the one end portion; a flat plate antenna(4, 18a, 18b, 19) mounted on the board (3) with a dielectric interposing therebetween wherein when feeding a current thereto to excite, a current also flows in said board (3); a first current direction change means (5a, 6, 6a, 6c, 7, 7a, 7c, 14a, 17a, 17c, 21a, 22a, 22b, 24a) changing a direction of the current flowing in the board (3) to a first direction when exciting the antenna (4, 18a, 18b, 19) and located on said one end portion of the board (3); and a second current direction change means (5b, 6, 6b, 6d, 7, 7b, 7d, 14b, 17b, 17d, 21b, 22c, 22d, 24b) changing a direction of the current flowing in the board (3) to a second direction different from the first direction when exciting said antenna (4, 18a, 18b, 19) and located on the other end portion of the board (3).Type: GrantFiled: June 28, 2002Date of Patent: August 3, 2004Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Hideaki Shoji, Yasuhito Imanishi, Toru Fukasawa, Hiroyuki Ohmine
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Patent number: 6768464Abstract: A portable telephone including a main unit case and an antenna element. The antenna element includes a meander line antenna as the first antenna unit arranged within the main unit case and formed to extend in one direction, and a second antenna unit extending substantially orthogonal to the extending direction of the meander line antenna, and arranged projectable from the main unit case, having an electrical length of approximately (&lgr;/2)×A (A is an integer), and coupled to the meander line antenna.Type: GrantFiled: January 23, 2002Date of Patent: July 27, 2004Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Hideaki Shoji, Yasuhito Imanishi, Toru Fukasawa, Hiroyuki Ohmine
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Patent number: 6677907Abstract: An antenna device (3a) includes a substrate (11) and an antenna (21) provided on the substrate (11) and having an electrical length of (&lgr;/2)×A (A is an integer). The antenna (21) includes a plate antenna (21b) positioned at a portion where an electrical length from an end portion (21d) is approximately &lgr;/4+(&lgr;/2)×B (B is an integer), and a meander line antenna (21a, 21c) connected to the plate antenna (21b).Type: GrantFiled: June 24, 2002Date of Patent: January 13, 2004Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Hideaki Shoji, Yasuhito Imanishi, Toru Fukasawa, Hiroyuki Ohmine
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Patent number: 6670924Abstract: An antenna element includes a plate antenna which is substantially equivalent to a series resonant circuit, and a monopole antenna which is connected to the plate antenna and is substantially equivalent to a parallel resonant circuit.Type: GrantFiled: December 13, 2001Date of Patent: December 30, 2003Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Hideaki Shoji, Yasuhito Imanishi, Toru Fukasawa, Hiroyuki Ohmine
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Patent number: 6633262Abstract: A portable telephone includes a metal substrate, a shield box, a monopole antenna and a feed unit. The surface of the metal substrate includes a conductive metal layer. The shield box covers a radio transmitter-receiver unit provided on the metal substrate to electromagnetically shield the radio transmitter-receiver unit, and has conductivity. The monopole antenna extends in a predetermined direction, and has an electrical length of (&lgr;/2)×N (N is an integer). The feed unit is provided at the metal substrate so as to be apart from the shield box in the extending direction of the monopole antenna. The feed unit includes a matching circuit.Type: GrantFiled: January 23, 2002Date of Patent: October 14, 2003Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Hideaki Shoji, Yasuhito Imanishi, Toru Fukasawa, Hiroyuki Ohmine
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Patent number: 6577279Abstract: A slide lever (6) is provided to a cabinet (2) of portable radio equipment, and an antenna (3) formed by nickel elastic alloy is held by a holding member (5). A lower portion of the antenna engages with an engaging portion (61) of slide lever (6), and by sliding slide lever (6), the lower portion of antenna (3) is bent at engaging portion (61) such that the entire antenna is inclined in a vertical direction by a desired angle, thereby reducing loss due to nonconformity of polarization with respect to an antenna of a base station.Type: GrantFiled: September 13, 2001Date of Patent: June 10, 2003Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Hideaki Shoji, Yasuhito Imanishi, Toru Fukasawa, Hiroyuki Ohmine
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Publication number: 20030013490Abstract: The mobile phone (1a) includes a lower housing (10) having one end (10a) and the other end (10b), an upper housing (20) having one end (20a) pivotally connected to the lower housing (10), and a monopole antenna (30) accommodated close to one end (10a) of the lower housing (10). The other end of the upper housing (20) pivots toward and away from the other end (10b) of the lower housing (10). The mobile phone (1a) is used in close proximity to a user's head with the other end (20b) of the upper housing (20) being distanced from the other end (10b) of the lower housing (10). Upon use, the lower housing (10) is disposed relative to the upper housing (20) so that the upper housing (20) intervenes between the monopole antenna (30) and the user's head (100).Type: ApplicationFiled: July 26, 2002Publication date: January 16, 2003Inventors: Hideaki Shoji, Takatoshi Katsura, Yoshinori Matsunami, Yasuhito Imanishi, Tetsuya Tanaka, Hirokazu Taketomi
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Publication number: 20030001786Abstract: An antenna device (3a) includes a substrate (11) and an antenna (21) provided on the substrate (11) and having an electrical length of (&lgr;/2)×A (A is an integer). The antenna (21) includes a plate antenna (21b) positioned at a portion where an electrical length from an end portion (21d) is approximately &lgr;/4+(&lgr;/2)×B (B is an integer), and a meander line antenna (21a, 21c) connected to the plate antenna (21b).Type: ApplicationFiled: June 24, 2002Publication date: January 2, 2003Inventors: Hideaki Shoji, Yasuhito Imanishi, Toru Fukasawa, Hiroyuki Ohmine
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Publication number: 20020169010Abstract: In a foldable portable telephone, a shield box provided within an upper casing is connected via a flexible cable to an output terminal of a transmitting circuit provided within a lower casing, and the shield box is used as an antenna. Thus, compared to the conventional case where a rod antenna is provided at an upper end of the lower casing, variation in gain dependent on a state of the user's hand holding the portable telephone is lessened.Type: ApplicationFiled: August 27, 2001Publication date: November 14, 2002Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventors: Hideaki Shoji, Yasuhito Imanishi, Toru Fukasawa, Yasuhiro Nishioka
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Publication number: 20010024944Abstract: The invention provides a compact mobile radio transmitter in which deterioration of antenna characteristic due to the influence of human head is decreased. A dielectric material 15 is arranged between a back face of a speaker 12 and a feed point 14 of an antenna 13, and electrical length between the human head and the antenna is increased as compared with the structure without the dielectric material 15.Type: ApplicationFiled: January 24, 2001Publication date: September 27, 2001Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventors: Yasuhiro Shiraki, Shinji Tanabe, Yasuhito Imanishi, Hideaki Shoji
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Patent number: 5852422Abstract: High gain antenna equipment is provided by improving gain with optimal impedance matching with an antenna element in a stored state as well as in an extended state. The antenna equipment is provided with a radio communication device housed in a case, a pullout type antenna element, a coil acting as a matching circuit element in an extended state of the antenna element and as a helical antenna in a stored state, and a switch connected to the coil at one end which is brought into contact at the other end with a ground terminal when the antenna element is in an extended state and which is brought into contact with an open terminal when the antenna element is in a stored state.Type: GrantFiled: January 27, 1997Date of Patent: December 22, 1998Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Yasuhito Imanishi
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Patent number: 5541610Abstract: An antenna equipment employing a chip inductor based antenna includes a multilayered miniaturized chip inductance element having an approximately .lambda./4 wavelength which achieves a half-wave dipole antenna performance together with a ground having an approximately .lambda./4 wavelength. In a preferred embodiment, the inductance element is formed of a plurality of thin sheets of insulating material carrying conductor segments which are connected through via-holes in the sheets to form a spiral inductance element within the stack of sheets. Direct connection avoids impedance matching circuit insertion loss and low-cost miniaturization with reduced antenna gain deterioration from surrounding conductors is provided for an effective miniature portable radio communication apparatus.Type: GrantFiled: September 27, 1995Date of Patent: July 30, 1996Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yasuhito Imanishi, Eriko Komori