Patents by Inventor Mitoru Yabe
Mitoru Yabe 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: 7031234Abstract: An objective lens driving apparatus includes a lens holder 1 that holds an objective lens 2, and a stationary base 9 that supports the lens holder 1 by a support shaft 3 parallel to an optical axis of the objective lens 2. A stationary yoke 11 and the magnet 8 are mounted to the stationary base 9. A focusing coil 4 and the tracking coils 5a and 5b are mounted to the lens holder 1. The interaction between the current in the focusing coil 4 and the magnetic field caused by the magnet 8 generates an electromagnetic force that moves the lens holder 1 along the support shaft 3. The interaction between the current in the tracking coils 5a and 5b and the magnetic field caused by the magnet 8 generates an electromagnetic force that rotates the lens holder 1 about the support shaft 3.Type: GrantFiled: April 15, 2004Date of Patent: April 18, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Keiji Nakamura, Mitoru Yabe
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Patent number: 7016125Abstract: An objective lens driving apparatus is used for accurately positioning an abject to focus a light spot on an optical recording medium. A lens holder holds the objective lens and has a bearing hole through which a shaft extends in a direction parallel to the optical axis so that the lens holder is rotatably supported on the shaft. Two magnets are supported on the lens holder so that the shaft is between the magnets. A base has two magnetic members disposed such that each of the two magnets exerts an attraction force on a corresponding one of the two magnetic members to urge the lens holder in a direction of the optical axis and in a direction perpendicular to the optical axis. A first coil set of first focusing and tracking coils and a second coil set of focusing and tracking coils are mounted to the two magnetic members.Type: GrantFiled: August 20, 2003Date of Patent: March 21, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Keiji Nakamura, Mitoru Yabe
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Publication number: 20050243442Abstract: A lens holder (1) is so supported that the lens holder (1) is movable along a supporting shaft (6) in parallel to an optical axis of the object lens (3), and rotatable about the supporting shaft (6). Magnets (41, 42) are mounted on the lens holder (1). Focusing coils (71, 72) and tracking coils (81, 82) having sides facing the magnets (41, 42) are mounted on a base (5) on which the supporting shaft (6) is planted. Yokes (91, 92) are so provided that the yokes (91, 92) and the magnets (41, 42) respectively sandwich the focusing coils (71, 72) and the tracking coils (81, 82). The yokes (91, 92) have facing portions (91a, 92a) that face respective magnetic poles of the magnets (41, 42) and extending portions (91b, 92b) extending in the directions away from the magnets (41, 42).Type: ApplicationFiled: September 16, 2003Publication date: November 3, 2005Inventors: Mitoru Yabe, Keiji Kamura
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Patent number: 6894850Abstract: An objective lens driving apparatus includes a lens holder 1 that holds an objective lens 2, and a stationary base 9 that supports the lens holder 1 by a support shaft 3 parallel to an optical axis of the objective lens 2. A stationary yoke 11 and the magnet 8 are mounted to the stationary base 9. A focusing coil 4 and the tracking coils 5a and 5b are mounted to the lens holder 1. The interaction between the current in the focusing coil 4 and the magnetic field caused by the magnet 8 generates an electromagnetic force that moves the lens holder 1 along the support shaft 3. The interaction between the current in the tracking coils 5a and 5b and the magnetic field caused by the magnet 8 generates an electromagnetic force that rotates the lens holder 1 about the support shaft 3.Type: GrantFiled: January 6, 2003Date of Patent: May 17, 2005Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Keiji Nakamura, Mitoru Yabe
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Patent number: 6888689Abstract: An objective lens driving apparatus includes a lens holder 1 that holds an objective lens 2, and a stationary base 9 that supports the lens holder 1 by a support shaft 3 parallel to an optical axis of the objective lens 2. A stationary yoke 11 and the magnet 8 are mounted to the stationary base 9. A focusing coil 4 and the tracking coils 5a and 5b are mounted to the lens holder 1. The interaction between the current in the focusing coil 4 and the magnetic field caused by the magnet 8 generates an electromagnetic force that moves the lens holder 1 along the support shaft 3. The interaction between the current in the tracking coils 5a and 5b and the magnetic field caused by the magnet 8 generates an electromagnetic force that rotates the lens holder 1 about the support shaft 3.Type: GrantFiled: April 15, 2004Date of Patent: May 3, 2005Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Keiji Nakamura, Mitoru Yabe
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Publication number: 20050076353Abstract: An objective lens driving apparatus is used for accurately positioning an abject to focus a light spot on an optical recording medium. A lens holder holds the objective lens and has a bearing hole through which a shaft extends in a direction parallel to the optical axis so that the lens holder is rotatably supported on the shaft. Two magnets are supported on the lens holder so that the shaft is between the magnets. A base has two magnetic members disposed such that each of the two magnets exerts an attraction force on a corresponding one of the two magnetic members to urge the lens holder in a direction of the optical axis and in a direction perpendicular to the optical axis. A first coil set of first focusing and tracking coils and a second coil set of focusing and tracking coils are mounted to the two magnetic members.Type: ApplicationFiled: August 20, 2003Publication date: April 7, 2005Inventors: Keiji Nakamura, Mitoru Yabe
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Patent number: 6839899Abstract: Tracking coils are fixed on side surfaces of a lens holder and a magnetic substance of axisymmetric shape is fixed on a lower surface of the lens holder, being sandwiched by a focusing coil. Moreover, end portions of the magnetic substance are opposed to respective N-pole surfaces of permanent magnets serving as a focusing driving device and a tracking driving device together with the above coils. As a result, a neutral position holding system for an objective lens can be formed of these permanent magnets and the magnetic substance.Type: GrantFiled: October 7, 2002Date of Patent: January 4, 2005Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Nobuo Takeshita, Mitoru Yabe
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Publication number: 20040190163Abstract: An objective lens driving apparatus includes a lens holder 1 that holds an objective lens 2, and a stationary base 9 that supports the lens holder 1 by a support shaft 3 parallel to an optical axis of the objective lens 2. A stationary yoke 11 and the magnet 8 are mounted to the stationary base 9. A focusing coil 4 and the tracking coils 5a and 5b are mounted to the lens holder 1. The interaction between the current in the focusing coil 4 and the magnetic field caused by the magnet 8 generates an electromagnetic force that moves the lens holder 1 along the support shaft 3. The interaction between the current in the tracking coils 5a and 5b and the magnetic field caused by the magnet 8 generates an electromagnetic force that rotates the lens holder 1 about the support shaft 3.Type: ApplicationFiled: April 15, 2004Publication date: September 30, 2004Applicant: Mitsubishi Denki Kabushiki KaishaInventors: Keiji Nakamura, Mitoru Yabe
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Publication number: 20040190403Abstract: An objective lens driving apparatus includes a lens holder 1 that holds an objective lens 2, and a stationary base 9 that supports the lens holder 1 by a support shaft 3 parallel to an optical axis of the objective lens 2. A stationary yoke 11 and the magnet 8 are mounted to the stationary base 9. A focusing coil 4 and the tracking coils 5a and 5b are mounted to the lens holder 1. The interaction between the current in the focusing coil 4 and the magnetic field caused by the magnet 8 generates an electromagnetic force that moves the lens holder 1 along the support shaft 3. The interaction between the current in the tracking coils 5a and 5b and the magnetic field caused by the magnet 8 generates an electromagnetic force that rotates the lens holder 1 about the support shaft 3.Type: ApplicationFiled: April 15, 2004Publication date: September 30, 2004Applicant: Mitsubishi Denki Kabushiki KaishaInventors: Keiji Nakamura, Mitoru Yabe
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Patent number: 6775207Abstract: An objective lens (1) for focusing light on an optical recording medium (not shown) and irradiating the same with the focused light is held on a lens holder (2). A support member (10) is provided on a base member (9) as a foundation of a device for driving optical system. The lens holder (2) is supported on the support member (10). Six linear elastic bodies (7a through 7f) of the same length are cylindrically shaped. The lens holder (2) is supported on the support member (10) by the linear elastic bodies (7a through 7f). A center of a circle formed by the ends of the linear elastic bodies (7a through 7f) is an axis of point symmetry thereof. Distances between adjacent ones of the ends of the linear elastic bodies (7a through 7f) are all the same.Type: GrantFiled: November 13, 2002Date of Patent: August 10, 2004Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Nobuo Takeshita, Mitoru Yabe
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Patent number: 6687062Abstract: An objective lens driving apparatus is used for accurately positioning an abject to focus a light spot on an optical recording medium. A lens holder holds the objective lens and has a bearing hole through which a shaft extends in a direction parallel to the optical axis so that the lens holder is rotatably supported on the shaft. Two magnets are supported on the lens holder so that the shaft is between the magnets. A base has two magnetic members disposed such that each of the two magnets exerts an attraction force on a corresponding one of the two magnetic members to urge the lens holder in a direction of the optical axis and in a direction perpendicular to the optical axis. A first coil set of first focusing and tracking coils and a second coil set of focusing and tracking coils are mounted to the two magnetic members.Type: GrantFiled: September 19, 2002Date of Patent: February 3, 2004Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Keiji Nakamura, Mitoru Yabe
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Publication number: 20030218963Abstract: An objective lens (1) for focusing light on an optical recording medium (not shown) and irradiating the same with the focused light is held on a lens holder (2). A support member (10) is provided on a base member (9) as a foundation of a device for driving optical system. The lens holder (2) is supported on the support member (10). Six linear elastic bodies (7a through 7f) of the same length are cylindrically shaped. The lens holder (2) is supported on the support member (10) by the linear elastic bodies (7a through 7f). A center of a circle formed by the ends of the linear elastic bodies (7a through 7f) is an axis of point symmetry thereof. Distances between adjacent ones of the ends of the linear elastic bodies (7a through 7f) are all the same.Type: ApplicationFiled: November 13, 2002Publication date: November 27, 2003Inventors: Nobuo Takeshita, Mitoru Yabe
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Publication number: 20030179686Abstract: Tracking coils are fixed on side surfaces of a lens holder and a magnetic substance of axisymmetric shape is fixed on a lower surface of the lens holder, being sandwiched by a focusing coil. Moreover, end portions of the magnetic substance are opposed to respective N-pole surfaces of permanent magnets serving as a focusing driving device and a tracking driving device together with the above coils. As a result, a neutral position holding system for an objective lens can be formed of these permanent magnets and the magnetic substance.Type: ApplicationFiled: October 7, 2002Publication date: September 25, 2003Inventors: Nobuo Takeshita, Mitoru Yabe
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Publication number: 20030179471Abstract: An objective lens driving apparatus includes a lens holder 1 that holds an objective lens 2, and a stationary base 9 that supports the lens holder 1 by a support shaft 3 parallel to an optical axis of the objective lens 2. A stationary yoke 11 and the magnet 8 are mounted to the stationary base 9. A focusing coil 4 and the tracking coils 5a and 5b are mounted to the lens holder 1. The interaction between the current in the focusing coil 4 and the magnetic field caused by the magnet 8 generates an electromagnetic force that moves the lens holder 1 along the support shaft 3. The interaction between the current in the tracking coils 5a and 5b and the magnetic field caused by the magnet 8 generates an electromagnetic force that rotates the lens holder 1 about the support shaft 3.Type: ApplicationFiled: January 6, 2003Publication date: September 25, 2003Inventors: Keiji Nakamura, Mitoru Yabe
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Publication number: 20030090816Abstract: An objective lens driving apparatus is used for accurately positioning an abject to focus a light spot on an optical recording medium. A lens holder holds the objective lens and has a bearing hole through which a shaft extends in a direction parallel to the optical axis so that the lens holder is rotatably supported on the shaft. Two magnets are supported on the lens holder so that the shaft is between the magnets. A base has two magnetic members disposed such that each of the two magnets exerts an attraction force on a corresponding one of the two magnetic members to urge the lens holder in a direction of the optical axis and in a direction perpendicular to the optical axis. A first coil set of first focusing and tracking coils and a second coil set of focusing and tracking coils are mounted to the two magnetic members.Type: ApplicationFiled: September 19, 2002Publication date: May 15, 2003Inventors: Keiji Nakamura, Mitoru Yabe
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Patent number: 5218597Abstract: A thruhole 23 is provided with a movable member so that a light beam irradiated from an LED passes through the thruhole and is received by a photo detector for positional detection whereby the position of an objective lens relative to the light receiving groove of an information recording medium is detected. At the same time, a light beam passing through the thruhole 46 and reflected by the information recording medium is received by a photo detector for inclination detection whereby the inclination angle of the objective lens against the information recording medium is detected.Type: GrantFiled: July 14, 1992Date of Patent: June 8, 1993Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Mitoru Yabe