Patents by Inventor Joji Okada
Joji Okada 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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Publication number: 20230229056Abstract: A light source unit (1000) of the present disclosure includes a light source part (100), a first electrical signal generating device (40-1) configured to control current that drives an optical semiconductor device (30), an optical modulator (200) having a Mach-Zehnder type optical waveguide (10) and an electrode configured to apply an electric field to the optical waveguide (10), and a second electrical signal generating device (40-2) configured to control a voltage that operates the optical modulator (200), the first electrical signal generating device (40-1) and the second electrical signal generating device (40-2) are synchronizably connected to each other, and intensity of light emitted from the optical modulator (200) is changed by the current controlled by the first electrical signal generating device (40-1) and the voltage controlled by the second electrical signal generating device (40-2).Type: ApplicationFiled: January 17, 2023Publication date: July 20, 2023Applicant: TDK CORPORATIONInventors: Hideaki FUKUZAWA, Joji OKADA, Takashi KIKUKAWA, Tsuyoshi KOMAKI
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Patent number: 11316320Abstract: A laser light-source apparatus includes a seed light source 10, fiber amplifiers 20 and 30 and a solid state amplifier 50 configured to amplify pulse light output from the seed light source, nonlinear optical elements 60 and 70 configured to perform wavelength conversion on the pulse light output from the solid state amplifier 50 and output the resultant pulse light, a semiconductor optical amplifier 15 disposed between the seed light source 10 and the solid state amplifier 50 and configured to amplify the pulse light output from the seed light source 10, and a control unit 100 configured to execute gain switching control processing in which the seed light source 10 is driven at a desired pulse rate, and semiconductor optical amplifier control processing in which an injection current to the semiconductor optical amplifier 15 is controlled depending on the pulse rate of the seed light source 10, and thus, generation of a giant pulse can be reliably prevented, regardless of the pulse rate of the seed light sourType: GrantFiled: April 19, 2018Date of Patent: April 26, 2022Assignee: SPECTRONIX CORPORATIONInventors: Joji Okada, Yosuke Orii
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Publication number: 20200052458Abstract: A laser light-source apparatus includes a seed light source 10, fiber amplifiers 20 and 30 and a solid state amplifier 50 configured to amplify pulse light output from the seed light source, nonlinear optical elements 60 and 70 configured to perform wavelength conversion on the pulse light output from the solid state amplifier 50 and output the resultant pulse light, a semiconductor optical amplifier 15 disposed between the seed light source 10 and the solid state amplifier 50 and configured to amplify the pulse light output from the seed light source 10, and a control unit 100 configured to execute gain switching control processing in which the seed light source 10 is driven at a desired pulse rate, and semiconductor optical amplifier control processing in which an injection current to the semiconductor optical amplifier 15 is controlled depending on the pulse rate of the seed light source 10, and thus, generation of a giant pulse can be reliably prevented, regardless of the pulse rate of the seed light sourType: ApplicationFiled: April 19, 2018Publication date: February 13, 2020Applicant: SPECTRONIX CORPORATIONInventors: Joji OKADA, Yosuke ORII
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Patent number: 10288981Abstract: A laser light-source apparatus includes a control unit configured to perform control in such a manner that a seed light source is driven in a pulse oscillation mode of oscillating pulse light based on gain switching in an output permitted state where output of pulse light from the apparatus is permitted, and is driven in a continuous oscillation mode of oscillating continuous light in an output stopped state in which the output of the pulse light from the apparatus is stopped, with power of excitation light for a solid state amplifier maintained, and adjusts power of laser light input to the solid state amplifier from the seed light source in the continuous oscillation mode in such a manner that the solid state amplifier outputs light with substantially same average power in the output stopped state and in the output permitted state.Type: GrantFiled: March 30, 2016Date of Patent: May 14, 2019Assignee: SPECTRONIX CORPORATIONInventors: Joji Okada, Yosuke Orii, Shinichi Murayama, Daisuke Okuyama
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Patent number: 10256599Abstract: A laser light-source apparatus includes: a fiber amplifier and a solid-state amplifier to amplify pulse light output from a seed light source serving as a first light source; a nonlinear optical element to perform wavelength conversion on the pulse light output from the solid-state amplifier; an optical switching element to permit or stop propagation of the pulse light from the fiber amplifier to the solid-state amplifier; a second light source disposed on an upstream side of the solid-state amplifier and is configured to output laser light able to be combined with the pulse light output from the seed light source; and a control unit to control the optical switching element in such a manner that the propagation of light is stopped and to perform control in such a manner that the second light source oscillates, at least in an output period of the pulse light from the seed light source.Type: GrantFiled: March 30, 2016Date of Patent: April 9, 2019Assignee: SPECTRONIX CORPORATIONInventors: Joji Okada, Yosuke Orii, Shinichi Murayama, Daisuke Okuyama
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Publication number: 20180278010Abstract: A laser light-source apparatus includes: a fiber amplifier and a solid-state amplifier to amplify pulse light output from a seed light source serving as a first light source; a nonlinear optical element to perform wavelength conversion on the pulse light output from the solid-state amplifier; an optical switching element to permit or stop propagation of the pulse light from the fiber amplifier to the solid-state amplifier; a second light source disposed on an upstream side of the solid-state amplifier and is configured to output laser light able to be combined with the pulse light output from the seed light source; and a control unit to control the optical switching element in such a manner that the propagation of light is stopped and to perform control in such a manner that the second light source oscillates, at least in an output period of the pulse light from the seed light source.Type: ApplicationFiled: March 30, 2016Publication date: September 27, 2018Applicant: SPECTRONIX CORPORATIONInventors: Joji OKADA, Yosuke ORII, Shinichi MURAYAMA, Daisuke OKUYAMA
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Publication number: 20180129114Abstract: A laser light-source apparatus includes a control unit configured to perform control in such a manner that a seed light source is driven in a pulse oscillation mode of oscillating pulse light based on gain switching in an output permitted state where output of pulse light from the apparatus is permitted, and is driven in a continuous oscillation mode of oscillating continuous light in an output stopped state in which the output of the pulse light from the apparatus is stopped, with power of excitation light for a solid state amplifier maintained, and adjusts power of laser light input to the solid state amplifier from the seed light source in the continuous oscillation mode in such a manner that the solid state amplifier outputs light with substantially same average power in the output stopped state and in the output permitted state.Type: ApplicationFiled: March 30, 2016Publication date: May 10, 2018Applicant: SPECTRONIX CORPORATIONInventors: Joji OKADA, Yosuke ORII, Shinichi MURAYAMA, Daisuke OKUYAMA
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Patent number: 9859675Abstract: A laser light-source apparatus includes: a seed light source; a fiber amplifier configured to amplify pulse light output from the seed light source based on gain switching; a solid state amplifier configured to further amplify the resultant pulse light; a nonlinear optical element configured to perform wavelength conversion on the pulse light output from the solid state amplifier; an optical switching element that is disposed between the fiber amplifier and the solid state amplifier and is configured to remove ASE noise; and a control unit. The control unit is configured to control the optical switching element in such a manner that propagation of light is permitted in an output period of the pulse light from the seed light source, and is stopped in a period other than the output period.Type: GrantFiled: February 9, 2015Date of Patent: January 2, 2018Assignee: SPECTRONIX CORPORATIONInventors: Joji Okada, Yosuke Orii
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Patent number: 9680285Abstract: A laser light-source apparatus includes: fiber amplifiers and a solid state amplifier configured to amplify pulse light output from a seed light source based on gain switching; nonlinear optical elements configured to perform wavelength conversion on the pulse light output from the solid state amplifier; an optical switching element configured to permit or stop propagation of pulse light from the fiber amplifier to the solid state amplifier; and a control unit configured to control the optical switching element in such a manner that the propagation of the light is stopped in an output period of the pulse light from the seed light source, and permitted in a period other than the output period of the pulse light from the seed light source.Type: GrantFiled: February 9, 2015Date of Patent: June 13, 2017Assignee: SPECTRONIX CORPORATIONInventors: Joji Okada, Yosuke Orii
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Publication number: 20170054268Abstract: A laser light-source apparatus includes; a seed light source; a fiber amplifier configured to amplify pulse light output from the seed light source based on gain switching; a solid state amplifier configured to further amplify the resultant pulse light; a nonlinear optical element configured to perform wavelength conversion on the pulse light output from the solid state amplifier; an optical switching element that is disposed between the fiber amplifier and the solid state amplifier and is configured to remove ASE noise; and a control unit. The control unit is configured to control the optical switching element in such a manner that propagation of light is permitted in an output period of the pulse light from the seed light source, and is stopped in a period other than the output period.Type: ApplicationFiled: February 9, 2015Publication date: February 23, 2017Applicant: SPECTRONIX CORPORATIONInventors: Joji OKADA, Yosuke ORII
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Publication number: 20170012402Abstract: A laser light-source apparatus includes: fiber amplifiers and a solid state amplifier configured to amplify pulse light output from a seed light source based on gain switching; nonlinear optical elements configured to perform wavelength conversion on the pulse light output from the solid state amplifier; an optical switching element configured to permit or stop propagation of pulse light from the fiber amplifier to the solid state amplifier; and a control unit configured to control the optical switching element in such a manner that the propagation of the light is stopped in an output period of the pulse light from the seed light source, and permitted in a period other than the output period of the pulse light from the seed light source.Type: ApplicationFiled: February 9, 2015Publication date: January 12, 2017Applicant: SPECTRONIX CORPORATIONInventors: Joji OKADA, Yosuke ORII
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Publication number: 20060018866Abstract: An oil-in-water emulsified composition containing; (A) ester oil which is in liquid state at 25° C. (B) sphingosines represented by the formula (1) (wherein, R1 represents hydrocarbon group which may have a substituent; Y represents a methylene group, a methine group or an oxygen atom; X1,X2 and X3 are H, OH or an acetoxy group; X4 represents H, an acetyl group or the like; R2 and R3 are H, OH and the like; R represents H or an amidino group; “a” stands for 2 or 3;) (C) an acid compound selected from the group consisting of inorganic acid or an organic acid having 5 or less carbon atoms, and (D) cholesterol or phytosterol, wherein the ratio of a liquid oil component containing Component (A) in the total amount of oil phase is 5 to 90 wt %.Type: ApplicationFiled: July 19, 2005Publication date: January 26, 2006Applicant: KAO CORPORATIONInventors: Kyoko Kawakami, Joji Okada
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Patent number: 6958292Abstract: In order to shorten the period for the development and manufacture of a semiconductor integrated circuit device, at the time of transferring integrated circuit patterns onto a wafer by an exposure process, a photomask PM1 is used which is provided partially with light shielding patterns 3a formed of a resist film, in addition to light shielding patterns formed of a metal.Type: GrantFiled: February 12, 2003Date of Patent: October 25, 2005Assignee: Renesas Technology Corp.Inventors: Norio Hasegawa, Joji Okada, Toshihiko Tanaka, Kazutaka Mori, Ko Miyazaki
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Patent number: 6936406Abstract: In order to shorten the period for the development and manufacture of a semiconductor integrated circuit device, at the time of transferring integrated circuit patterns onto a wafer by an exposure process, a photomask PM1 is used which is provided partially with light shielding patterns 3a formed of a resist film, in addition to light shielding patterns formed of a metal.Type: GrantFiled: February 12, 2003Date of Patent: August 30, 2005Assignee: Renesas Technology Corp.Inventors: Norio Hasegawa, Joji Okada, Toshihiko Tanaka, Kazutaka Mori, Ko Miyazaki
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Patent number: 6902868Abstract: In order to shorten the period for the development and manufacture of a semiconductor integrated circuit device, at the time of transferring integrated circuit patterns onto a wafer by an exposure process, a photomask PM1 is used which is provided partially with a light shielding patterns 3a formed of a resist film, in addition to light shielding patterns formed of a metal.Type: GrantFiled: June 28, 2001Date of Patent: June 7, 2005Assignee: Renesas Technology Corp.Inventors: Norio Hasegawa, Joji Okada, Toshihiko Tanaka, Kazutaka Mori, Ko Miyazaki
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Patent number: 6846598Abstract: In order to shorten the time required to change or correct a mask pattern over a mask, light-shielding patterns formed of a resist film for integrated circuit pattern transfer are partly provided over a mask substrate constituting a photomask in addition to light-shielding patterns formed of a metal for the integrated circuit pattern transfer.Type: GrantFiled: October 17, 2003Date of Patent: January 25, 2005Assignee: Hitachi, Ltd.Inventors: Norio Hasegawa, Toshihiko Tanaka, Joji Okada, Kazutaka Mori, Ko Miyazaki
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Patent number: 6794207Abstract: In order to shorten the period for the development and manufacture of a semiconductor integrated circuit device, at the time of transferring integrated circuit patterns onto a wafer by an exposure process, a photomask PM1 is used which is provided partially with light shielding patterns 3a formed of a resist film, in addition to light shielding patterns formed of a metal.Type: GrantFiled: February 12, 2003Date of Patent: September 21, 2004Assignee: Renesas Technology Corp.Inventors: Norio Hasegawa, Joji Okada, Toshihiko Tanaka, Kazutaka Mori, Ko Miyazaki
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Publication number: 20040086789Abstract: In order to shorten the time required to change or correct a mask pattern over a mask, light-shielding patterns formed of a resist film for integrated circuit pattern transfer are partly provided over a mask substrate constituting a photomask in addition to light-shielding patterns formed of a metal for the integrated circuit pattern transfer.Type: ApplicationFiled: October 17, 2003Publication date: May 6, 2004Inventors: Norio Hasegawa, Toshihiko Tanaka, Joji Okada, Kazutaka Mori, Ko Miyazaki
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Patent number: 6656644Abstract: In order to shorten the time required to change or correct a mask pattern over a mask, light-shielding patterns formed of a resist film for integrated circuit pattern transfer are partly provided over a mask substrate constituting a photomask in addition to light-shielding patterns formed of a metal for the integrated circuit pattern transfer.Type: GrantFiled: June 18, 2001Date of Patent: December 2, 2003Assignee: Hitachi Ltd.Inventors: Norio Hasegawa, Toshihiko Tanaka, Joji Okada, Kazutaka Mori, Ko Miyazaki
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Publication number: 20030180670Abstract: In order to shorten the period for the development and manufacture of a semiconductor integrated circuit device there is used, at the time of transferring integrated circuit patterns onto a wafer by an exposure process, a photomask PM1 which is provided partially with light shielding patterns 3a formed of a resist film in addition to light shielding patterns formed of a metal.Type: ApplicationFiled: December 17, 2002Publication date: September 25, 2003Inventors: Norio Hasegawa, Joji Okada, Toshihiko Tanaka, Kazutaka Mori, Ko Miyazaki