Patents by Inventor Jun Miyazu
Jun Miyazu 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: 9372339Abstract: A wavelength swept light source includes a sawtooth waveform as a main waveform and an exponential component of the sawtooth waveform to the controlled voltage of the electro-optic deflector. The controlled voltage is controlled so that, as an oscillation wavelength to be swept is swept towards a longer wavelength side, a change rate of the oscillation wavelength is increased.Type: GrantFiled: January 4, 2012Date of Patent: June 21, 2016Assignee: Nippon Telegraph and Telephone CommunicationsInventors: Seiji Toyoda, Kazunori Naganuma, Yuichi Okabe, Shogo Yagi, Kazutoshi Kato, Masahiro Ueno, Takashi Sakamoto, Tadayuki Imai, Jun Miyazu, Kazuto Noguchi, Shigeo Ishibashi
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Patent number: 8773749Abstract: A variable focusing lens is provided that can change the focal length at a high speed. The variable focusing lens includes: a single crystal electrooptic material having inversion symmetry; a first anode formed on a first surface of the electrooptic material; a second cathode provided to have an interval to the first anode; and a first cathode and a second anode that are formed on a second surface opposed to the first surface and that are formed at positions opposed to the first anode and the second cathode. An optical axis is set so that, when light enters through a third face orthogonal to the first surface, light exists through a fourth surface opposed to the third face. A voltage applied between the first and the second pair of electrodes is changed to thereby change the focal point of light emitted from the fourth surface of the electrooptic material.Type: GrantFiled: June 11, 2010Date of Patent: July 8, 2014Assignee: Nippon Telegraph and Telephone CorporationInventors: Tadayuki Imai, Masahiro Sasaura, Jun Miyazu, Shogo Yagi, Seiji Toyoda
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Patent number: 8654167Abstract: An electrooptic device having a simple structure that can efficiently increase deflection of a beam is provided. The device includes: an electrooptic crystal (11) having an electrooptic effect; an electrode pair of a positive electrode (12) and a negative electrode (13) for generating an electric field inside the electrooptic crystal; and a power source for applying a voltage between the electrode pair so as to generate a space charge inside the electrooptic crystal. With this arrangement, by using a simple structure, a change in a deflection angle is temporally rapid, and a large deflection angle that cannot be obtained by a conventional electrooptic crystal prism can be acquired at a low applied voltage.Type: GrantFiled: March 23, 2012Date of Patent: February 18, 2014Assignee: Nippon Telegraph and Telephone CorporationInventors: Kouichirou Nakamura, Kazuo Fujiura, Tadayuki Imai, Jun Miyazu
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Patent number: 8648893Abstract: An electrooptic device having a simple structure that can efficiently increase deflection of a beam is provided. The device includes: an electrooptic crystal (11) having an electrooptic effect; an electrode pair of a positive electrode (12) and a negative electrode (13) for generating an electric field inside the electrooptic crystal; and a power source for applying a voltage between the electrode pair so as to generate a space charge inside the electrooptic crystal. With this arrangement, by using a simple structure, a change in a deflection angle is temporally rapid, and a large deflection angle that cannot be obtained by a conventional electrooptic crystal prism can be acquired at a low applied voltage.Type: GrantFiled: June 16, 2010Date of Patent: February 11, 2014Assignee: Nippon Telegraph and Telephone CorporationInventors: Kouichirou Nakamura, Kazuo Fujiura, Tadayuki Imai, Jun Miyazu
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Publication number: 20130286454Abstract: In a wavelength swept light source using a polygon mirror in a well-known art, an oscillation wavelength roughly linearly varies in an upwardly slight convex shape with respect to time. On the other hand, in a wavelength swept light source of SS-OCT, the wavelength is required to vary so that a wavenumber (inverse of wavelength) linearly varies on a time axis. The wavelength swept light source of the well-known art has had a drawback that such wavelength variation cannot be implemented; non-linear distortion occurs in a resultant OCT image; and thereby, a point spread function cannot be kept sharp.Type: ApplicationFiled: January 4, 2012Publication date: October 31, 2013Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Seiji Toyoda, Kazunori Naganuma, Yuichi Okabe, Shogo Yagi, Kazutoshi Kato, Masahiro Ueno, Takashi Sakamoto, Tadayuki Imai, Jun Miyazu, Kazuto Noguchi, Shigeo Ishibashi
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Publication number: 20120182600Abstract: An electrooptic device having a simple structure that can efficiently increase deflection of a beam is provided. The device includes: an electrooptic crystal (11) having an electrooptic effect; an electrode pair of a positive electrode (12) and a negative electrode (13) for generating an electric field inside the electrooptic crystal; and a power source for applying a voltage between the electrode pair so as to generate a space charge inside the electrooptic crystal. With this arrangement, by using a simple structure, a change in a deflection angle is temporally rapid, and a large deflection angle that cannot be obtained by a conventional electrooptic crystal prism can be acquired at a low applied voltage.Type: ApplicationFiled: March 23, 2012Publication date: July 19, 2012Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kouichirou Nakamura, Kazuo Fujiura, Tadayuki Imai, Jun Miyazu
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Publication number: 20120075694Abstract: A variable focusing lens is provided that can change the focal length at a high speed. The variable focusing lens includes: a single crystal electrooptic material having inversion symmetry; a first anode formed on a first surface of the electrooptic material; a second cathode provided to have an interval to the first anode; and a first cathode and a second anode that are formed on a second surface opposed to the first surface and that are formed at positions opposed to the first anode and the second cathode. An optical axis is set so that, when light enters through a third face orthogonal to the first surface, light exists through a fourth surface opposed to the third face. A voltage applied between the first and the second pair of electrodes is changed to thereby change the focal point of light emitted from the fourth surface of the electrooptic material.Type: ApplicationFiled: June 11, 2010Publication date: March 29, 2012Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Tadayuki Imai, Masahiro Sasaura, Jun Miyazu, Shogo Yagi, Seiji Toyoda
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Patent number: 8014061Abstract: To provide a variable-focal length lens capable of altering its focal length at high speed. The variable-focal length lens has an electrooptic material and electrodes formed on an incident surface of light and on an exit surface of the light of the electrooptic material. An optical axis is set so that the light is inputted into a gap where the electrodes of the incident surface are not formed and is outputted from a gap where the electrodes of the exit surface are not formed. A focus of the light that is transmitted through the electrooptic material becomes variable by varying an applied voltage between the electrodes of the incident surface and the electrodes of the exit surface.Type: GrantFiled: December 26, 2008Date of Patent: September 6, 2011Assignee: Nippon Telegraph and Telephone CorporationInventors: Tadayuki Imai, Masahiro Sasaura, Jun Miyazu, Shogo Yagi, Kazuo Fujiura
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Publication number: 20100290104Abstract: To provide a variable-focal length lens capable of altering its focal length at high speed. The variable-focal length lens has an electrooptic material and electrodes formed on an incident surface of light and on an exit surface of the light of the electrooptic material. An optical axis is set so that the light is inputted into a gap where the electrodes of the incident surface are not formed and is outputted from a gap where the electrodes of the exit surface are not formed. A focus of the light that is transmitted through the electrooptic material becomes variable by varying an applied voltage between the electrodes of the incident surface and the electrodes of the exit surface.Type: ApplicationFiled: December 26, 2008Publication date: November 18, 2010Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Tadayuki Imai, Masahiro Sasaura, Jun Miyazu, Shogo Yagi, Kazuo Fujiura
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Publication number: 20100253996Abstract: An electrooptic device having a simple structure that can efficiently increase deflection of a beam is provided. The device includes: an electrooptic crystal (11) having an electrooptic effect; an electrode pair of a positive electrode (12) and a negative electrode (13) for generating an electric field inside the electrooptic crystal; and a power source for applying a voltage between the electrode pair so as to generate a space charge inside the electrooptic crystal. With this arrangement, by using a simple structure, a change in a deflection angle is temporally rapid, and a large deflection angle that cannot be obtained by a conventional electrooptic crystal prism can be acquired at a low applied voltage.Type: ApplicationFiled: June 16, 2010Publication date: October 7, 2010Applicant: Nippon Telegraph and Telephone CorporationInventors: Kouichirou Nakamura, Kazuo Fujiura, Tadayuki Imai, Jun Miyazu
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Patent number: 7764302Abstract: An electrooptic device having a simple structure that can efficiently increase deflection of a beam is provided. The device includes: an electrooptic crystal (11) having an electrooptic effect; an electrode pair of a positive electrode (12) and a negative electrode (13) for generating an electric field inside the electrooptic crystal; and a power source for applying a voltage between the electrode pair so as to generate a space charge inside the electrooptic crystal. With this arrangement, by using a simple structure, a change in a deflection angle is temporally rapid, and a large deflection angle that can not be obtained by a conventional electrooptic crystal prism can be acquired at a low applied voltage.Type: GrantFiled: June 20, 2006Date of Patent: July 27, 2010Assignee: Nippon Telegraph and Telephone CorporationInventors: Kouichirou Nakamura, Kazuo Fujiura, Tadayuki Imai, Jun Miyazu
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Publication number: 20090219378Abstract: An electrooptic device having a simple structure that can efficiently increase deflection of a beam is provided. The device includes: an electrooptic crystal (11) having an electrooptic effect; an electrode pair of a positive electrode (12) and a negative electrode (13) for generating an electric field inside the electrooptic crystal; and a power source for applying a voltage between the electrode pair so as to generate a space charge inside the electrooptic crystal. With this arrangement, by using a simple structure, a change in a deflection angle is temporally rapid, and a large deflection angle that can not be obtained by a conventional electrooptic crystal prism can be acquired at a low applied voltage.Type: ApplicationFiled: June 20, 2006Publication date: September 3, 2009Applicant: Nippon Telegraph and Telephone CorporationInventors: Kouichirou Nakamura, Kazuo Fujiura, Tadayuki Imai, Jun Miyazu