Patents by Inventor Tadashi Kojima
Tadashi Kojima 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: 9417369Abstract: The present invention provides a retardation film web having sufficient reversed wavelength dispersion characteristics and favorable for film lamination according to a roll-to-roll system. A retardation film web of the present invention includes a polycarbonate resin or a polyester carbonate resin, an orientation angle ? which is an angle between a slow axis and a width direction satisfies the following formula (I), and a ratio of an in-plane retardation R450 measured at a wavelength of 450 nm to an in-plane retardation R550 measured at a wavelength of 550 nm satisfies the following formula (II): 38°???52°??(I) R450/R550<1??(II).Type: GrantFiled: March 28, 2013Date of Patent: August 16, 2016Assignees: NITTO DENKO CORPORATION, MITSUBISHI CHEMICAL CORPORATIONInventors: Takashi Shimizu, Kazuki Uwada, Tadashi Kojima, Nao Murakami, Tomohiko Tanaka, Shingo Namiki
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Patent number: 9400345Abstract: There is provided a circularly polarizing plate that can prevent light leakage in an organic EL panel and can suppress the warping of the panel to reduce reflection unevenness in a panel surface. A circularly polarizing plate according to an embodiment of the present invention is used in an organic EL panel, and includes a polarizer and a retardation film directly bonded to the polarizer. In-plane retardations of the retardation film satisfy a relationship of Re(450)<Re(550); and a 90° adhesive strength between the polarizer and the retardation film is 1.0 N/20 mm or more.Type: GrantFiled: June 24, 2013Date of Patent: July 26, 2016Assignee: NITTO DENKO CORPORATIONInventors: Toshiyuki Iida, Takashi Shimizu, Nao Murakami, Kazuki Uwada, Tadashi Kojima
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Patent number: 9164213Abstract: Provided is a polarizing plate that has an excellent viewing angle characteristic and suppresses changes in display characteristics. A polarizing plate of the present invention is used in an organic EL panel, and includes a polarizer (10), a first retardation layer (30), and a second retardation layer (40). The first retardation layer (30) shows a refractive index characteristic of nx>ny?nz, satisfies a relationship of Re(450)<Re(550), and has a water absorption rate of 3% or less. The second retardation layer (40) shows a refractive index characteristic of nz>nx?ny. A laminate of the first retardation layer (30) and the second retardation layer (40) has an Re(550) of from 120 nm to 160 nm and an Rth(550) of from 40 nm to 100 nm.Type: GrantFiled: June 18, 2013Date of Patent: October 20, 2015Assignee: NITTO DENKO CORPORATIONInventors: Hironori Yaginuma, Takashi Shimizu, Kazuki Uwada, Nao Murakami, Tadashi Kojima, Kentarou Takeda
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Publication number: 20150168624Abstract: Provided is a polarizing plate that has an excellent viewing angle characteristic and suppresses changes in display characteristics. A polarizing plate of the present invention is used in an organic EL panel, and includes a polarizer (10), a first retardation layer (30), and a second retardation layer (40). The first retardation layer (30) shows a refractive index characteristic of nx>ny?nz, satisfies a relationship of Re(450)<Re(550), and has a water absorption rate of 3% or less. The second retardation layer (40) shows a refractive index characteristic of nz>nx?ny. A laminate of the first retardation layer (30) and the second retardation layer (40) has an Re(550) of from 120 nm to 160 nm and an Rth(550) of from 40 nm to 100 nm.Type: ApplicationFiled: June 18, 2013Publication date: June 18, 2015Applicant: NITTO DENKO CORPORATIONInventors: Hironori Yaginuma, Takashi Shimizu, Kazuki Uwada, Nao Murakami, Tadashi Kojima, Kentarou Takeda
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Publication number: 20150160387Abstract: There is provided a circularly polarizing plate that can prevent light leakage in an organic EL panel and can suppress the warping of the panel to reduce reflection unevenness in a panel surface. A circularly polarizing plate according to an embodiment of the present invention is used in an organic EL panel, and includes a polarizer and a retardation film directly bonded to the polarizer. In-plane retardations of the retardation film satisfy a relationship of Re(450)<Re(550); and a 90° adhesive strength between the polarizer and the retardation film is 1.0 N/20 mm or more.Type: ApplicationFiled: June 24, 2013Publication date: June 11, 2015Applicant: NITTO DENKO CORPORATIONInventors: Toshiyuki Iida, Takashi Shimizu, Nao Murakami, Kazuki Uwada, Tadashi Kojima
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Publication number: 20150116826Abstract: There is provided a polarizing plate that achieves an excellent reflection hue. A polarizing plate according to an embodiment of the present invention is used in an organic EL panel, and includes a polarizer and a retardation film. In-plane retardations of the retardation film satisfy a relationship of Re(450)<Re(550); and an angle ? formed between an absorption axis of the polarizer and a slow axis of the retardation film satisfies a relationship of 38°???44° or of 46°???52°.Type: ApplicationFiled: June 24, 2013Publication date: April 30, 2015Applicant: NITTO DENKO CORPORATIONInventors: Takashi Shimizu, Nao Murakami, Kazuki Uwada, Tadashi Kojima, Hironori Yaginuma
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Publication number: 20150109667Abstract: The present invention provides a long retardation film having sufficient reversed wavelength dispersion characteristics and favorable for film lamination according to a roll-to-roll system. A long retardation film of the present invention includes a polycarbonate resin or a polyester carbonate resin, an orientation angle ? which is an angle between a slow axis and a width direction satisfies the following formula (I), and a ratio of an in-plane retardation R450 measured at a wavelength of 450 nm to an in-plane retardation R550 measured at a wavelength of 550 nm satisfies the following formula (II): 38°???52°??(I) R450/R550<1??(II).Type: ApplicationFiled: March 28, 2013Publication date: April 23, 2015Applicants: NITTO DENKO CORPORATION, MITSUBISHI CHEMICAL CORPORATIONInventors: Takashi Shimizu, Kazuki Uwada, Tadashi Kojima, Nao Murakami, Tomohiko Tanaka, Shingo Namiki
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Publication number: 20140347730Abstract: This invention provides a unit for an image display device in which an optical film laminate and a panel for an image display device are laminated with an adhesive layer therebetween. The optical film laminate contains a polarizer and a polarizer protection functional layer laminated to only one surface of the polarizer. The adhesive layer is laminated to the surface of the polarizer that is opposite to the surface that contacts the polarizer protection functional layer. The panel for an image display device is laminated to the surface of the adhesive layer that is opposite to the surface that contacts the polarizer. A glass transition temperature of the adhesive layer is in a range of from 50° C. to 90° C.Type: ApplicationFiled: September 14, 2012Publication date: November 27, 2014Applicant: NITTO DENKO CORPORATIONInventors: Kentaro Takeda, Tadashi Kojima, Toshiki Oomine, Takuya Mori
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Publication number: 20140327963Abstract: The present invention provides a method of producing a retardation film excellent in stretchability and capable of achieving high alignment property. The method of producing a retardation film of the present invention is the method in which a lengthy resin film is stretched in a widthwise direction thereof while being conveyed in a lengthwise direction thereof to provide a retardation film satisfying a relationship of 0.70<Re(450)/Re(550)<0.97, including: a preheating step of heating the resin film to a temperature T1; a preliminary stretching step of stretching the resin film after the preheating while cooling the film to a temperature T2; and a main stretching step.Type: ApplicationFiled: July 24, 2013Publication date: November 6, 2014Applicant: NITTO DENKO CORPORATIONInventors: Toshiyuki Iida, Takashi Shimizu, Nao Murakami, Kazuki Uwada, Tadashi Kojima
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Publication number: 20140300965Abstract: Invention provides unit for image display device in which optical film laminate and panel for image display device are laminated with adhesive layer therebetween. Optical film laminate includes polarizer, polarizer protection functional layer laminated to one surface of polarizer, and surface protection layer laminated to surface of polarizer that is opposite to surface that contacts polarizer protection functional layer. An adhesive layer is laminated to surface of polarizer protection functional layer that is opposite to surface that contacts the polarizer. A panel for image display device is laminated to surface of the adhesive layer that is opposite to surface that contacts the polarizer protection functional layer. Elastic modulus of the adhesive layer, which has been cured, at a temperature of 25° C., is greater than or equal to 1/50 of elastic modulus of layer, from among the layers included in optical film laminate, having smallest elastic modulus.Type: ApplicationFiled: September 14, 2012Publication date: October 9, 2014Applicant: NITTO DENKO CORPORATIONInventors: Kentaro Takeda, Tadashi Kojima
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Patent number: 8208348Abstract: When detecting a rotational position of a seconds hand, it is determined whether data stored in a register in correspondence with a supply state of a drive current previously supplied to a coil of a stepping motor is “0”. When the data is “0”, the rotational position of the seconds hand is optically detected. When the data is “1”, the seconds hand is rotated one step, and then, the rotational position of the seconds hand is optically detected. Even though the seconds hand is shifted one second, the position detection is executed every two steps.Type: GrantFiled: May 28, 2009Date of Patent: June 26, 2012Assignee: Casio Computer Co., Ltd.Inventors: Tadashi Kojima, Nobuhiro Aoki
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Patent number: 8127807Abstract: A guide piece having a guide surface is integrally formed in a body portion so as to protrude from an inner circumferential wall surface of a pour passage toward the center thereof. A gas guide portion is formed in a portion of the pour passage in which the guide piece is formed. The gas guide portion is defined by a lower surface of the guide piece and the inner circumferential wall surface of the pour passage.Type: GrantFiled: May 31, 2007Date of Patent: March 6, 2012Assignees: Tokai Kogyo Co., Ltd., Toyota Jidosha Kabushiki KaishaInventors: Hiroyuki Ito, Tadashi Kojima, Yujirou Ishikawa, Takahiro Goto
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Patent number: 8107324Abstract: A hand position detecting device stops optical detection of the respective rotational positions of seconds, center and hour hands when such detection is impossible. When it is determined that the respective positions of the hands have not been detected successively a predetermined number of times, the detection of the hand positions is stopped until a predetermined time, for example 5 minutes before 11 o'clock or 55 minutes past 10 o'clock. This prevents unnecessary repetition of detection of the hand positions and hence useless consumption of battery energy which would otherwise occur.Type: GrantFiled: December 22, 2008Date of Patent: January 31, 2012Assignee: Casio Computer Co., Ltd.Inventor: Tadashi Kojima
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Patent number: 8023364Abstract: A solar panel determines whether or not a wristwatch is in darkness. When the darkness has continued for a predetermined time period, e.g., for 61-70 minutes, it is determined that the wristwatch is not in use and set in a sleep state. Out of seconds, center and hour hands, at least the seconds hand is rotated to a reference position (00-second position) and stopped, and positions of the center and hour hands are detected. Therefore, power consumption during can be reduced when the wristwatch is not in use.Type: GrantFiled: May 27, 2009Date of Patent: September 20, 2011Assignee: Casio Computer Co., Ltd.Inventor: Tadashi Kojima
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Patent number: 7721343Abstract: Reinforcement of a system renewability is realized skillfully utilizing properties peculiar to a system. As a result, there is produced such a new effect as to similarly reinforce required specification with respect to copyright protection of a content recorded in a medium for exclusive use in reproduction and a recordable medium. In a system which encrypts information such as a content to record/reproduce the information, design is made so that encryption/decryption processing information differs for a device (software (S/W) main body device) whose main body is software constituted of a recording/reproducing drive of a recording medium and a personal computer (PC), a device (hardware (H/W) main body device) whose main body is hardware integrally containing a drive and data coding/demodulation processing, and the medium for exclusive use in reproduction and the recording medium.Type: GrantFiled: November 1, 2005Date of Patent: May 18, 2010Assignee: Kabushiki Kaish ToshibaInventors: Taku Kato, Tadashi Kojima, Hisashi Yamada, Atsushi Ishihara
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Publication number: 20100020396Abstract: Provided are: a polarizer protective film, which is allowed to express excellent UV-absorbing ability by using a UV-absorbing monomer as a raw material, has excellent heat resistance and excellent optical transparency, and has much less coloring and foaming; a polarizing plate with less defects in an outer appearance, using the polarizer protective film; and an image display apparatus of high quality, using the polarizing plate. The polarizer protective film of the present invention has a light transmittance at 380 nm in a thickness of 80 ?m of 30% or less, and is obtained by molding a forming material that contains a resin component containing as a main component a (meth)acrylic resin obtained by polymerizing a monomer composition containing a UV-absorbing monomer and a (meth)acrylic monomer by extrusion molding.Type: ApplicationFiled: September 27, 2007Publication date: January 28, 2010Applicants: NIPPON SHOKUBAI CO., LTD., NITTO DENKO CORPORATIONInventors: Hiroko Izumi, Yoshitomo Nakata, Ken-Ichi Ueda, Daisuke Hattori, Tadashi Kojima, Hiroyuki Takao, Tsutomu Hani
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Publication number: 20090296534Abstract: When detecting a rotational position of a seconds hand, it is determined whether data stored in a register in correspondence with a supply state of a drive current previously supplied to a coil of a stepping motor is “0”. When the data is “0”, the rotational position of the seconds hand is optically detected. When the data is “1”, the seconds hand is rotated one step, and then, the rotational position of the seconds hand is optically detected. Even though the seconds hand is shifted one second, the position detection is executed every two steps.Type: ApplicationFiled: May 28, 2009Publication date: December 3, 2009Applicant: Casio Computer Co., Ltd.Inventors: Tadashi Kojima, Nobuhiro Aoki
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Publication number: 20090296533Abstract: A solar panel determines whether or not a wristwatch is in darkness. When the darkness has continued for a predetermined time period, e.g., for 61-70 minutes, it is determined that the wristwatch is not in use and set in a sleep state. Out of seconds, center and hour hands, at least the seconds hand is rotated to a reference position (00-second position) and stopped, and positions of the center and hour hands are detected. Therefore, power consumption during can be reduced when the wristwatch is not in use.Type: ApplicationFiled: May 27, 2009Publication date: December 3, 2009Applicant: Casio Computer Co., Ltd.Inventor: Tadashi KOJIMA
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Publication number: 20090161120Abstract: A hand position detecting device stops optical detection of the respective rotational positions of seconds, center and hour hands when such detection is impossible. When it is determined that the respective positions of the hands have not been detected successively a predetermined number of times, the detection of the hand positions is stopped until a predetermined time, for example 5 minutes before 11 o'clock or 55 minutes past 10 o'clock. This prevents unnecessary repetition of detection of the hand positions and hence useless consumption of battery energy which would otherwise occur.Type: ApplicationFiled: December 22, 2008Publication date: June 25, 2009Applicant: Casio Computer Co., Ltd.Inventor: Tadashi KOJIMA
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Patent number: 7536727Abstract: In a content management method, content data is encrypted by a first key, the first key is encrypted by plural types of second keys, the encrypted first key is multiply encrypted by a third key, and the third key is encrypted by a fourth key. These encrypted content data, a medium key which is the first key encrypted by the second key and a move key which is a first key multiply encoded by the second and third keys are recorded in a recording medium, the third key encrypted by the fourth key is recorded in a security region. This management method is managed by the move key and the medium key.Type: GrantFiled: November 28, 2003Date of Patent: May 19, 2009Assignee: Kabushiki Kaisha ToshibaInventors: Tadashi Kojima, Hisashi Yamada, Taku Kato, Atsushi Ishihara, Kazuhiko Taira