Patents by Inventor Mitsuru Kinouchi
Mitsuru Kinouchi 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: 6463019Abstract: An optical pickup comprises an objective-lens driving device including a movable section provided with an objective lens, a focusing coil, and tracking coils, and a fixed section provided with a single magnetic circuit having a magnetic gap, the focusing coil and the tracking coils being disposed in the magnetic gap. The point of application of a tracking-driving force, the point of application of a result force of focusing-driving forces occurring in and outside the magnetic gap, and the position of the center of gravity of the movable section are made to substantially coincide with each other. In addition, the objective lens and the magnetic circuit are disposed within an area of a window in a lower shell of a optical disk. Further, a through hole for accommodating a lower portion of a yoke of the magnetic circuit is provided in a mounting base on which the objective-lens driving device is mounted.Type: GrantFiled: July 17, 2001Date of Patent: October 8, 2002Assignee: TDK CorporationInventors: Noriyuki Kawano, Kouichi Ogura, Yoshio Saito, Mitsuru Kinouchi, Nobuo Uekusa, Hiroyuki Matsuura
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Publication number: 20020003769Abstract: An optical head including a distributed feedback laser having first and second cladding layers, an active layer sandwiched between said first and second cladding layers, a first reflecting member having a periodic wave-shaped structure formed within said first cladding layer at an interface between said active layer and said first cladding layer or in close proximity to said active layer, a second reflecting member provided on a first end surface of an assembly of said first and second cladding layer and active layer and having an exit window formed by a fine aperture, a third reflecting member provided on a second end surface of said assembly, and first and second current injection electrodes electrically connected to said first and second cladding layers, respectively as well as to an injection current source for injecting a current modulated in accordance with information to be recorded on the optical record medium into the laser.Type: ApplicationFiled: March 21, 2001Publication date: January 10, 2002Applicant: TDK CorporationInventors: Minoru Yamada, Mitsuru Kinouchi
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Publication number: 20010038581Abstract: An optical pickup comprises an objective-lens driving device including a movable section provided with an objective lens, a focusing coil, and tracking coils, and a fixed section provided with a single magnetic circuit having a magnetic gap, the focusing coil and the tracking coils being disposed in the magnetic gap. The point of application of a tracking-driving force, the point of application of a result force of focusing-driving forces occurring in and outside the magnetic gap, and the position of the center of gravity of the movable section are made to substantially coincide with each other. In addition, the objective lens and the magnetic circuit are disposed within an area of a window in a lower shell of a optical disk. Further, a through hole for accommodating a lower portion of a yoke of the magnetic circuit is provided in a mounting base on which the objective-lens driving device is mounted.Type: ApplicationFiled: July 17, 2001Publication date: November 8, 2001Applicant: TDK CORPORATIONInventors: Noriyuki Kawano, Kouichi Ogura, Yoshio Saito, Mitsuru Kinouchi, Nobuo Uekusa, Hiroyuki Matsurra
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Patent number: 6288984Abstract: An optical pickup comprises an objective-lens driving device including a movable section provided with an objective lens, a focusing coil, and tracking coils, and a fixed section provided with a single magnetic circuit having a magnetic gap, the focusing coil and the tracking coils being disposed in the magnetic gap. The point of application of a tracking-driving force, the point of application of a result force of focusing-driving forces occurring in and outside the magnetic gap, and the position of the center of gravity of the movable section are made to substantially coincide with each other. In addition, the objective lens and the magnetic circuit are disposed within an area of a window in a lower shell of a optical disk. Further, a through hole for accommodating a lower portion of a yoke of the magnetic circuit is provided in a mounting base on which the objective-lens driving device is mounted.Type: GrantFiled: May 23, 2000Date of Patent: September 11, 2001Assignee: TDK CorporationInventors: Noriyuki Kawano, Kouichi Ogura, Yoshio Saito, Mitsuru Kinouchi, Nobuo Uekusa, Hiroyuki Matsuura
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Patent number: 6084834Abstract: An optical pickup includes an objective-lens driving device including a movable section provided with an objective lens, a focusing coil, and tracking coils, and a fixed section provided with a single magnetic circuit having a magnetic gap, the focusing coil and the tracking coils being disposed in the magnetic gap. The point of application of a tracking-driving force, the point of application of a result force of focusing-driving forces occurring in and outside the magnetic gap, and the position of the center of gravity of the movable section are made to substantially coincide with each other. In addition, the objective lens and the magnetic circuit are disposed within an area of a window in a lower shell of a optical disk. Further, a through hole for accommodating a lower portion of a yoke of the magnetic circuit is provided in a mounting base on which the objective-lens driving device is mounted.Type: GrantFiled: December 19, 1997Date of Patent: July 4, 2000Assignee: TDK CorporationInventors: Noriyuki Kawano, Kouichi Ogura, Yoshio Saito, Mitsuru Kinouchi
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Patent number: 5877904Abstract: An optical pickup comprises an objective-lens driving device including a movable section provided with an objective lens, a focusing coil, and tracking coils, and a fixed section provided with a single magnetic circuit having a magnetic gap, the focusing coil and the tracking coils being disposed in the magnetic gap. The point of application of a tracking-driving force, the point of application of a result force of focusing-driving forces occurring in and outside the magnetic gap, and the position of the center of gravity of the movable section are made to substantially coincide with each other. In addition, the objective lens and the magnetic circuit are disposed within an area of a window in a lower shell of a optical disk. Further, a through hole for accommodating a lower portion of a yoke of the magnetic circuit is provided in a mounting base on which the objective-lens driving device is mounted.Type: GrantFiled: July 3, 1997Date of Patent: March 2, 1999Assignee: TDK CorporationInventors: Noriyuki Kawano, Mitsuru Kinouchi, Nobuo Uekusa, Hiroyuki Matsuura
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Patent number: 5724337Abstract: An optical pickup comprises an objective-lens driving device including a movable section provided with an objective lens, a focusing coil, and tracking coils, and a fixed section provided with a single magnetic circuit having a magnetic gap, the focusing coil and the tracking coils being disposed in the magnetic gap. The point of application of a tracking-driving force, the point of application of a result force of focusing-driving forces occurring in and outside the magnetic gap, and the position of the center of gravity of the movable section are made to substantially coincide with each other. In addition, the objective lens and the magnetic circuit are disposed within an area of a window in a lower shell of a optical disk. Further, a through hole for accommodating a lower portion of a yoke of the magnetic circuit is provided in a mounting base on which the objective-lens driving device is mounted.Type: GrantFiled: February 27, 1997Date of Patent: March 3, 1998Assignee: TDK CorporationInventors: Noriyuki Kawano, Kouichi Ogura, Yoshio Saito, Mitsuru Kinouchi, Nobuo Uekusa, Hiroyuki Matsuura
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Patent number: 5508992Abstract: A light source for generating light beams, a diffraction grating for splitting the light beam emitted from the light source into at least three light beams, and an objective lens for receiving the reflecting light beams from the recording medium, the magnification of the objective lens being -6.0 to -12.0, make up a collimatorless optical system. The reflecting light beams emanating from the objective lens are split by a beam splitter, these split light beams are each split into at least three light beams by a Wollaston prism, and are incident on a photo detecting element. A tracking error signal, a focusing error signal, and a magneto-optical signal are generated using the light beams received by the photo detecting element. The beam splitter and the Wollaston prism may be substituted by a multifunctional Wollaston prism. If the nine split light beams are all received by the photo detecting element, the signals produced by the photo detecting element are large in amplitude.Type: GrantFiled: September 29, 1994Date of Patent: April 16, 1996Assignee: TDK CorporationInventors: Kazunori Hirose, Mitsuru Kinouchi
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Patent number: RE38648Abstract: A light source for generating light beams, a diffraction grating for splitting the light beam emitted from the light source into at least three light beams, and an objective lens for receiving the reflecting light beams from the recording medium, the magnification of the objective lens being −6.0 to less than −12.0, make up a collimatorless optical system. The reflecting light beams emanating from the objective lens are split by a beam splitter, these split light beams are each split into at least three light beams by a Wollaston prism, and are incident on a photo detecting element. A tracking error signal, a focusing error signal, and a magneto-optical signal are generated using the light beams received by the photo detecting element. The beam splitter and the Wollaston prism may be substituted by a multifunctional Wollaston prism. If the nine split light beams are all received by the photo detecting element, the signals produced by the photo detecting element are large in amplitude.Type: GrantFiled: April 16, 1998Date of Patent: November 9, 2004Assignee: TDK CorporationInventors: Kazunori Hirose, Mitsuru Kinouchi
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Patent number: RE40928Abstract: An optical pickup comprises an objective-lens driving device including a movable section provided with an objective lens, a focusing coil, and tracking coils, and a fixed section provided with a single magnetic circuit having a magnetic gap, the focusing coil and the tracking coils being disposed in the magnetic gap. The point of application of a tracking-driving force, the point of application of a result force of focusing-driving forces occurring in and outside the magnetic gap, and the position of the center of gravity of the movable section are made to substantially coincide with each other. In addition, the objective lens and the magnetic circuit are disposed within an area of a window in a lower shell of a optical disk. Further, a through hole for accommodating a lower portion of a yoke of the magnetic circuit is provided in a mounting base on which the objective-lens driving device is mounted.Type: GrantFiled: December 26, 2006Date of Patent: October 6, 2009Assignee: TDK CorporationInventors: Noriyuki Kawano, Kouichi Ogura, Yoshio Saito, Mitsuru Kinouchi