Patents by Inventor Yasuyuki Sugi
Yasuyuki Sugi 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: 20070229982Abstract: An imaging lens unit comprising, in order from the object side, a first lens having a meniscus shape with its convex surface on the object side, an aperture stop and a second lens having a meniscus shape with its convex surface on the image side. A maximal value of a tangent angle within a range of a lens surface effective diameter of the surface on the object side of the first lens is 70 to 90 degrees. A maximal value of a tangent angle within a range of a lens surface effective diameter of the surface on the image side of the second lens is 70 to 90 degrees.Type: ApplicationFiled: March 30, 2007Publication date: October 4, 2007Applicant: HITACHI MAXELL, LTD.Inventors: Yoshiaki Minakawa, Yasuyuki Sugi
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Publication number: 20070047425Abstract: An objective lens of this embodiment is used in an optical head in which a distance between a DVD laser and a CD laser is fixed. The objective lens focuses a laser beam emitted from the DVD laser on a DVD by a numerical aperture of 0.60, and focuses a laser beam emitted from the CD laser on a CD by an numerical aperture of 0.47. The wavefront aberration in design for CD is set greater than the wavefront aberration in design for DVD.Type: ApplicationFiled: August 29, 2006Publication date: March 1, 2007Applicant: HITACHI MAXELL, LTD.Inventors: Yutaka Makino, Yasuyuki Sugi
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Publication number: 20060262707Abstract: A lens surface of an objective lens is divided into a plurality of zones concentric about an optical axis. The lens surface includes an inner area and an outer area located outside the inner area. The inner area focuses the first light beam on the information recording surface of the first optical recording medium and focuses the second light beam on the information recording surface of the second optical recording medium. The outer area causes the first light beam to become flare and focuses the second light beam on the information recording surface of the second optical recording medium.Type: ApplicationFiled: May 16, 2006Publication date: November 23, 2006Applicant: Hitachi Maxell, Ltd.Inventors: Mitsuhiro Miyauchi, Koichiro Wakabayashi, Yasuyuki Sugi, Yutaka Makino
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Publication number: 20060245315Abstract: An optical pickup lens focuses laser beams having different wavelengths ?1, ?2 and ?3 on at least three kinds of optical discs. At least one side of the optical pickup lens has a concentric loop zonal structure for compensating wavefront aberration occurring when recording or reproducing an optical disc having a substrate thickness t1 by the laser beam having the wavelength ?1 and wavefront aberration occurring when recording or reproducing an optical disc having a substrate thickness t2 by the laser beam having the wavelength ?2. When recording or reproducing an optical disc having a substrate thickness t3 by the laser beam having the wavelength ?3, a phase difference given to the laser beam having the wavelength ?3 due to the concentric loop zonal structure is about 0.15 ? or smaller.Type: ApplicationFiled: April 18, 2006Publication date: November 2, 2006Applicant: Hitachi Maxell, Ltd.Inventors: Koichiro Wakabayashi, Mitsuhiro Miyauchi, Yasuyuki Sugi, Yutaka Makino
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Publication number: 20060083122Abstract: A pickup lens with a phase compensator is composed of a condenser lens and a phase compensator. At least one surface of the condenser lens has a step-like annular zone structure to compensate wavefront aberration generated when recording and reproducing data on an information recording medium having a substrate thickness of t1 with a laser beam having a wavelength ?1 and wavefront aberration generated when recording and reproducing data on an information recording medium having a substrate thickness of t2 with a laser beam having a wavelength ?2. The phase compensator compensates wavefront aberration generated when recording and reproducing data on an information recording medium having a substrate thickness of t3 with a laser beam having a wavelength ?3.Type: ApplicationFiled: October 19, 2005Publication date: April 20, 2006Applicant: HITACHI MAXELL, LTD.Inventors: Koichiro Wakabayashi, Keiko Hirao, Mitsuhiro Miyauchi, Yutaka Makino, Yasuyuki Sugi, Yoshikazu Mitsui
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Publication number: 20060018234Abstract: An optical pickup system for reading information of three kinds of optical recording media. The optical pickup system has a wavelength selective filter that includes an outer area for shielding one light beam of light beams having three kinds of wavelengths and an inner area for allowing all the light beams to pass through. The optical pickup system also has an objective lens that focuses each light beam having passed through the wavelength selective filter on each light recording medium. An optical head and an optical disk apparatus have the optical pickup system.Type: ApplicationFiled: July 19, 2005Publication date: January 26, 2006Applicant: Hitachi Maxell, Ltd.Inventors: Yasuyuki Sugi, Yoshiaki Minakawa, Mitsuhiro Miyauchi, Koichiro Wakabayashi
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Publication number: 20060018237Abstract: An optical pickup system for reading information of three kinds of optical recording media. The optical pickup system has a wavelength selective filter that includes an outer area for shielding one light beam of light beams having three kinds of wavelengths and an inner area for allowing all the light beams to pass through. The optical pickup system also has an objective lens that focuses each light beam having passed through the wavelength selective filter on each light recording medium. An optical head and an optical disk apparatus have the optical pickup system.Type: ApplicationFiled: July 19, 2005Publication date: January 26, 2006Applicant: Hitachi Maxell, Ltd.Inventors: Yasuyuki Sugi, Yoshiaki Minakawa, Mitsuhiro Miyauchi, Koichiro Wakabayashi
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Patent number: 6965482Abstract: When the DVD provided with the DVD substrate 2 having thickness t2 of 0.6 mm is installed in the optical disc apparatus, the light beam 4 having wavelength ?1=655 nm is used as luminous flux of numerical aperture NA=0.63 to be condensed on the information surface 2a on the DVD substrate 2. When the CD provided with the CD substrate 3 having thickness t2 of 1.2 mm is installed in the optical disc apparatus, the light beam 5 having wavelength ?2=790 nm is effectively used as luminous flux of approximate numerical aperture NA=0.45 to be condensed on the information surface 3a on the DVD substrate 3. The wavefront aberration caused by a thickness difference between the DVD substrate 2 and CD substrate 3 is canceled out by the chromatic aberration caused by a wavelength difference between the light beams 4 and 5. Therefore, in spite of the difference in the transparent substrates, the light beams are suitably condensed respectively on the information surface 2a and 3a.Type: GrantFiled: July 21, 2004Date of Patent: November 15, 2005Assignee: Hitachi Maxell, Ltd.Inventors: Yasuyuki Sugi, Takesuke Maruyama
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Publication number: 20050063284Abstract: When the DVD provided with the DVD substrate 2 having thickness t2 of 0.6 mm is installed in the optical disc apparatus, the light beam 4 having wavelength ?1=655 nm is used as luminous flux of numerical aperture NA=0.63 to be condensed on the information surface 2a on the DVD substrate 2. When the CD provided with the CD substrate 3 having thickness t2 of 1.2 mm is installed in the optical disc apparatus, the light beam 5 having wavelength ?2=790 nm is effectively used as luminous flux of approximate numerical aperture NA=0.45 to be condensed on the information surface 3a on the DVD substrate 3. The wavefront aberration caused by a thickness difference between the DVD substrate 2 and CD substrate 3 is canceled out by the chromatic aberration caused by a wavelength difference between the light beams 4 and 5. Therefore, in spite of the difference in the transparent substrates, the light beams are suitably condensed respectively on the information surface 2a and 3a.Type: ApplicationFiled: November 12, 2004Publication date: March 24, 2005Applicant: Hitachi Maxell, Ltd.Inventors: Yasuyuki Sugi, Takesuke Maruyama
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Publication number: 20050007935Abstract: The multi-wavelength lens for condensing a plurality of kinds of monochromatic light by refraction is disclosed. The lens comprises a common use area for all monochromatic light on at least one lens surface, the area sectioned into a plurality of aspherical zones each of which having a different refractive power; and step portions, each of which formed between adjacent aspherical zones of the plurality of aspherical zones and having a step height Dj (j=1,2,3,4, and so on, in order of closeness to a lens optical axis) in a direction parallel to the lens optical axis. At least half of the step portions satisfy a following formula when a minimum value and a maximum value of Aij for each wavelength ?i are MIN(Aij) and MAX(Aij), respectively: MAX(Aij)/MIN(Aij)<3 where, Aij=absolute(Bij?mij), Bij=(absolute(Dj))*(ni?1)/?i?C, ni is a refractive index of a lens for a wavelength ?i, mij is an integral number closest to Bij, and C is a corrective term.Type: ApplicationFiled: July 9, 2004Publication date: January 13, 2005Applicant: HITACHI MAXELL, LTD.Inventor: Yasuyuki Sugi
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Patent number: 6836378Abstract: When the DVD provided with the DVD substrate 2 having thickness t2 of 0.6 mm is installed in the optical disc apparatus, the light beam 4 having wavelength &lgr;1=655 nm is used as luminous flux of numerical aperture NA=0.63 to be condensed on the information surface 2a on the DVD substrate 2. When the CD provided with the CD substrate 3 having thickness t2 of 1.2 mm is installed in the optical disc apparatus, the light beam 5 having wavelength &lgr;2=790 nm is effectively used as luminous flux of approximate numerical aperture NA=0.45 to be condensed on the information surface 3a on the DVD substrate 3. The wavefront aberration caused by a thickness difference between the DVD substrate 2 and CD substrate 3 is canceled out by the chromatic aberration caused by a wavelength difference between the light beams 4 and 5. Therefore, in spite of the difference in the transparent substrates, the light beams are suitably condensed respectively on the information surface 2a and 3a.Type: GrantFiled: September 26, 2003Date of Patent: December 28, 2004Assignee: Hitachi Maxell, Ltd.Inventors: Yasuyuki Sugi, Takesuke Maruyama
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Publication number: 20040257673Abstract: When the DVD provided with the DVD substrate 2 having thickness t2 of 0.6 mm is installed in the optical disc apparatus, the light beam 4 having wavelength &lgr;1=655 nm is used as luminous flux of numerical aperture NA=0.63 to be condensed on the information surface 2a on the DVD substrate 2. When the CD provided with the CD substrate 3 having thickness t2 of 1.2 mm is installed in the optical disc apparatus, the light beam 5 having wavelength &zgr;2=790 nm is effectively used as luminous flux of approximate numerical aperture NA=0.45 to be condensed on the information surface 3a on the DVD substrate 3. The wavefront aberration caused by a thickness difference between the DVD substrate 2 and CD substrate 3 is canceled out by the chromatic aberration caused by a wavelength difference between the light beams 4 and 5. Therefore, in spite of the difference in the transparent substrates, the light beams are suitably condensed respectively on the information surface 2a and 3a.Type: ApplicationFiled: July 21, 2004Publication date: December 23, 2004Applicant: Hitachi Maxell, Ltd.Inventors: Yasuyuki Sugi, Takesuke Maruyama
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Patent number: 6721242Abstract: An optical detector for detecting at least three optical beams reflected by an optical information recording medium and outputting an electric signal, the optical detector having three light receiving areas each of which receives a respective one of the three optical beams and each of which has four light receiving surfaces, twelve signal lines to transmit an electric signal obtained on respective ones of the four light receiving surfaces of the three light receiving areas, selected ones of the twelve signal lines connected to the four light receiving surfaces of different ones of the three light receiving areas being joined together within the optical detector, and less than nine signal output lines formed by joining the selected ones of the twelve signal lines extend from the optical detector to a signal processing circuit.Type: GrantFiled: May 13, 2002Date of Patent: April 13, 2004Assignees: Hitachi, Ltd., Hitachi Media Electronics Co., Ltd.Inventors: Kunikazu Ohnishi, Takeshi Shimano, Shigeru Nakamura, Masayuki Inoue, Yukio Fukui, Yasuyuki Sugi, Shinji Fujita, Mitsuhiko Ota
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Publication number: 20040062181Abstract: When the DVD provided with the DVD substrate 2 having thickness t2 of 0.6 mm is installed in the optical disc apparatus, the light beam 4 having wavelength &lgr;1=655 nm is used as luminous flux of numerical aperture NA=0.63 to be condensed on the information surface 2a on the DVD substrate 2. When the CD provided with the CD substrate 3 having thickness t2 of 1.2 mm is installed in the optical disc apparatus, the light beam 5 having wavelength &lgr;2=790 nm is effectively used as luminous flux of approximate numerical aperture NA=0.45 to be condensed on the information surface 3a on the DVD substrate 3. The wavefront aberration caused by a thickness difference between the DVD substrate 2 and CD substrate 3 is canceled out by the chromatic aberration caused by a wavelength difference between the light beams 4 and 5. Therefore, in spite of the difference in the transparent substrates, the light beams are suitably condensed respectively on the information surface 2a and 3a.Type: ApplicationFiled: September 26, 2003Publication date: April 1, 2004Applicant: Hitachi Maxell, Ltd.Inventors: Yasuyuki Sugi, Takesuke Maruyama
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Patent number: 6678096Abstract: When the DVD provided with the DVD substrate 2 having thickness t2of 0.6 mm is installed in the optical disc apparatus, the light beam 4 having wavelength &lgr;1=655 nm is used as luminous flux of numerical aperture NA=0.63 to be condensed on the information surface 2a on the DVD substrate 2. When the CD provided with the CD substrate 3 having thickness t2 of 1.2 mm is installed in the optical disc apparatus, the light beam 5 having wavelength &lgr;2=790 nm is effectively used as luminous flux of approximate numerical aperture NA=0.45 to be condensed on the information surface 3a on the DVD substrate 3. The wavefront aberration caused by a thickness difference between the DVD substrate 2 and CD substrate 3 is canceled out by the chromatic aberration caused by a wavelength difference between the light beams 4 and 5. Therefore, in spite of the difference in the transparent substrates, the light beams are suitably condensed respectively on the information surface 2a and 3a.Type: GrantFiled: December 30, 2002Date of Patent: January 13, 2004Assignee: Hitachi Maxell, Ltd.Inventors: Yasuyuki Sugi, Takesuke Maruyama
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Publication number: 20030142414Abstract: When the DVD provided with the DVD substrate 2 having thickness t2of 0.6 mm is installed in the optical disc apparatus, the light beam 4 having wavelength &lgr;1=655 nm is used as luminous flux of numerical aperture NA=0.63 to be condensed on the information surface 2a on the DVD substrate 2. When the CD provided with the CD substrate 3 having thickness t2 of 1.2 mm is installed in the optical disc apparatus, the light beam 5 having wavelength &lgr;2=790 nm is effectively used as luminous flux of approximate numerical aperture NA=0.45 to be condensed on the information surface 3a on the DVD substrate 3. The wavefront aberration caused by a thickness difference between the DVD substrate 2 and CD substrate 3 is canceled out by the chromatic aberration caused by a wavelength difference between the light beams 4 and 5. Therefore, in spite of the difference in the transparent substrates, the light beams are suitably condensed respectively on the information surface 2a and 3a.Type: ApplicationFiled: December 30, 2002Publication date: July 31, 2003Applicant: HITACHI MAXELL, LTD.Inventors: Yasuyuki Sugi, Takesuke Maruyama
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Patent number: 6507009Abstract: It is desirable to greatly reduce the disturbance that arises in a focusing error signal by a astigmatic detection method and offset that arises in the tracking error signal by a push-pull method when reproducing various information storing disks, such as a DVD-RAM disk. It is also desirable to provide an optical disk apparatus which is able to reproduce a variety of high density optical disks, such as DVD-RAM and DVD-ROM disks, as well as conventional disks, such as CD, CD-ROM, CD-R disks, by using a simple optional head. For this purpose, an optical disk apparatus irradiates three optical beams produced by a diffraction grating on the specified position of an optical disk and detects reflected light using a specified optical detector divided into twelve parts.Type: GrantFiled: July 6, 1999Date of Patent: January 14, 2003Assignees: Hitachi, Ltd., Hitachi Media Electronics Co., Ltd.Inventors: Kunikazu Ohnishi, Takeshi Shimano, Shigeru Nakamura, Masayuki Inoue, Yukio Fukui, Yasuyuki Sugi, Shinji Fujita, Mitsuhiko Ota
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Publication number: 20020141301Abstract: An optical detector for detecting at least three optical beams reflected by an optical information recording medium and outputting an electric signal, the optical detector having three light receiving areas each of which receives a respective one of the three optical beams and each of which has four light receiving surfaces, twelve signal lines to transmit an electric signal obtained on respective ones of the four light receiving surfaces of the three light receiving areas, selected ones of the twelve signal lines connected to the four light receiving surfaces of different ones of the three light receiving areas being joined together within the optical detector, and less than nine signal output lines formed by joining the selected ones of the twelve signal lines extend from the optical detector to a signal processing circuit.Type: ApplicationFiled: May 13, 2002Publication date: October 3, 2002Inventors: Kunikazu Ohnishi, Takeshi Shimano, Shigeru Nakamura, Masayuki Inoue, Yukio Fukui, Yasuyuki Sugi, Shinji Fujita, Mitsuhiko Ota
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Patent number: 5872761Abstract: The present invention comprises an arrangement with removable optical element having a predetermined focal distance in the light path between a light source and an objective lens, so as to insert said optical element into the light path between the light source and the objective lens for playing back or recording onto one type of thickness of disk plates, as well as to remove it therefrom for playing back or recording onto another type of thickness of disk plates. Alternatively, by retaining variably the distance between the light source and the collimator lens, the distance between the light source and the collimator lens along with the light path is variably changed according to the thickness of the disk plate being inserted. Then by determining the type of the disk inserted and accordingly selectably inserting/removing the optical element, only one objective lens may be used to conform to the disk plates having different thicknesses.Type: GrantFiled: August 28, 1997Date of Patent: February 16, 1999Assignee: Hitachi, Ltd.Inventors: Yasuyuki Sugi, Toshio Sugiyama, Nobuo Imada, Hidenori Shinohara, Yukio Fukui
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Patent number: 5699341Abstract: The present invention comprises an arrangement with removable optical element having a predetermined focal distance in the light path between a light source and an objective lens, so as to insert said optical element into the light path between the light source and the objective lens for playing back or recording onto one type of thickness of disk plates, as well as to remove it therefrom for playing back or recording onto another type of thickness of disk plates. Alternatively, by retaining variably the distance between the light source and the collimator lens, the distance between the light source and the collimator lens along with the light path is variably changed according to the thickness of the disk plate being inserted. Then by determining the type of the disk inserted and accordingly selectably inserting/removing the optical element, only one objective lens may be used to conform to the disk plates having different thicknesses.Type: GrantFiled: September 11, 1996Date of Patent: December 16, 1997Assignee: Hitachi, Ltd.Inventors: Yasuyuki Sugi, Toshio Sugiyama, Nobuo Imada, Hidenori Shinohara, Yukio Fukui