Patents by Inventor Mitsuaki Wada
Mitsuaki Wada 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: 11414304Abstract: In this boom slewing angle detection device, a slewing angle detecting gear is attached to an end of a shaft of a pinion gear that meshes with a ring gear formed on a slewing bearing rotatably supporting a crane boom, and the amount of rotation of the slewing angle detecting gear is detected by a slewing-angle-detecting proximity sensor. The slewing angle detecting gear is not meshed with the ring gear or the pinion gear, which compose a slewing force transmission mechanism; thus, grease, and the like, do not adhere to the slewing angle detecting gear, and external teeth for detection of the slewing angle detecting gear are not subject to wear, so accurate slewing angle detection is possible.Type: GrantFiled: December 14, 2017Date of Patent: August 16, 2022Assignee: MAEDA SEISAKUSHO CO., LTD.Inventors: Shinya Tokutome, Mitsuaki Wada, Takahisa Karasawa
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Patent number: 10988355Abstract: A crawler crane includes: a seating switch that detects whether an operator is in a driver seat; a turn angle potentiometer that detects the turn position of a boom; and a controller. The controller is provided with a boom turn restriction control unit for performing a boom turn-restricting control whereby the boom is not allowed to turn within a predetermined angular range above the driver seat on the basis of the output from the turn angle potentiometer. The boom turn restriction control unit includes a restriction-canceling unit that cancels the boom turn-restricting control performed by a turn-restricting unit if a preset restriction-canceling condition is met. The boom turn restriction control unit cancels the boom turn-restricting control if the seating switch does not detect an operator. Ease of operation and work can thus be improved in a remote operation mode and the like.Type: GrantFiled: December 16, 2016Date of Patent: April 27, 2021Assignee: MAEDA SEISAKUSHO CO., LTD.Inventors: Shinya Tokutome, Tatsufumi Tomura, Ryosuke Nakamura, Eiji Ichimura, Mitsuaki Wada
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Publication number: 20200331729Abstract: In this boom slewing angle detection device, a slewing angle detecting gear is attached to an end of a shaft of a pinion gear that meshes with a ring gear formed on a slewing bearing rotatably supporting a crane boom, and the amount of rotation of the slewing angle detecting gear is detected by a slewing-angle-detecting proximity sensor. The slewing angle detecting gear is not meshed with the ring gear or the pinion gear, which compose a slewing force transmission mechanism; thus, grease, and the like, do not adhere to the slewing angle detecting gear, and external teeth for detection of the slewing angle detecting gear are not subject to wear, so accurate slewing angle detection is possible.Type: ApplicationFiled: December 14, 2017Publication date: October 22, 2020Applicant: MAEDA SEISAKUSHO CO., LTD.Inventors: Shinya TOKUTOME, Mitsuaki WADA, Takahisa KARASAWA
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Publication number: 20200283273Abstract: A crawler crane includes: a seating switch that detects whether an operator is in a driver seat; a turn angle potentiometer that detects the turn position of a boom; and a controller. The controller is provided with a boom turn restriction control unit for performing a boom turn-restricting control whereby the boom is not allowed to turn within a predetermined angular range above the driver seat on the basis of the output from the turn angle potentiometer. The boom turn restriction control unit includes a restriction-canceling unit that cancels the boom turn-restricting control performed by a turn-restricting unit if a preset restriction-canceling condition is met. The boom turn restriction control unit cancels the boom turn-restricting control if the seating switch does not detect an operator. Ease of operation and work can thus be improved in a remote operation mode and the like.Type: ApplicationFiled: December 16, 2016Publication date: September 10, 2020Applicant: Maeda Seisakusho Co., Ltd.Inventors: Shinya TOKUTOME, Tatsufumi TOMURA, Ryosuke NAKAMURA, Eiji ICHIMURA, Mitsuaki WADA
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Patent number: 10710847Abstract: In a crawler crane, while a fly jib is in use, the fly jib is suspended from a coupling flange by a jib raising/lowering wire rope that is wound around a sheave, the sheave being slidably attached to a tip end side section of the fly jib. If the sheave is caused to slide by a jib raising/lowering cylinder attached to the fly jib, the fly jib suspended from the coupling flange by the jib raising/lowering wire rope inclines with respect to a boom. The raising/lowering mechanism of the fly jib is installed on the fly jib side, thus making it possible to easily perform work to extract/store the fly jib.Type: GrantFiled: June 17, 2016Date of Patent: July 14, 2020Assignee: MAEDA SEISAKUSHO CO., LTD.Inventors: Shinya Tokutome, Tatsufumi Tomura, Ryosuke Nakamura, Eiji Ichimura, Mitsuaki Wada
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Publication number: 20190300340Abstract: In a crawler crane, while a fly jib is in use, the fly jib is suspended from a coupling flange by a jib raising/lowering wire rope that is wound around a sheave, the sheave being slidably attached to a tip end side section of the fly jib. If the sheave is caused to slide by a jib raising/lowering cylinder attached to the fly jib, the fly jib suspended from the coupling flange by the jib raising/lowering wire rope inclines with respect to a boom. The raising/lowering mechanism of the fly jib is installed on the fly jib side, thus making it possible to easily perform work to extract/store the fly jib.Type: ApplicationFiled: June 17, 2016Publication date: October 3, 2019Applicant: Maeda Seisakusho Co., Ltd.Inventors: Shinya TOKUTOME, Tatsufumi TOMURA, Ryosuke NAKAMURA, Eiji ICHIMURA, Mitsuaki WADA
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Patent number: 8982477Abstract: Including, in order from an object side: a first lens group having positive power; a second lens group having negative power; and a third lens group having positive power, each distance between respective lens groups varying upon zooming; the third lens group including, in order from the object side, a first sub-group having positive power, a second sub-group having positive power, a third sub-group having negative power, and a fourth sub-group having positive power, the first sub-group being movable along an optical axis for focusing, the third sub-group being movable in a direction including a component perpendicular to the optical axis, thereby correcting an image blur, and a given condition being satisfied, thereby providing a compact zoom lens having high optical performance with disposing a focusing lens and a vibration reduction lens in the same lens group, an optical apparatus equipped therewith, and a method for manufacturing the zoom lens.Type: GrantFiled: May 24, 2012Date of Patent: March 17, 2015Assignee: Nikon CorporationInventor: Mitsuaki Wada
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Patent number: 8493664Abstract: Providing a close-up lens with superb optical performance capable of focusing from infinity to a close distance allowing a life-size magnification by an internal focusing system with small moving amounts of focusing lens groups, an imaging apparatus, and a method for focusing a close-up lens. The close-up lens includes four lens groups, and is able to focus an object with an imaging magnification from ?=0 through at least ?=?0.5, wherein upon focusing, a first lens group and a fourth lens group are fixed with respect to an image plane, and a second lens group and a third lens group are moved along an optical axis.Type: GrantFiled: February 17, 2011Date of Patent: July 23, 2013Assignee: Nikon CorporationInventor: Mitsuaki Wada
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Publication number: 20120300313Abstract: Including, in order from an object side: a first lens group having positive power; a second lens group having negative power; and a third lens group having positive power, each distance between respective lens groups varying upon zooming; the third lens group including, in order from the object side, a first sub-group having positive power, a second sub-group having positive power, a third sub-group having negative power, and a fourth sub-group having positive power, the first sub-group being movable along an optical axis for focusing, the third sub-group being movable in a direction including a component perpendicular to the optical axis, thereby correcting an image blur, and a given condition being satisfied, thereby providing a compact zoom lens having high optical performance with disposing a focusing lens and a vibration reduction lens in the same lens group, an optical apparatus equipped therewith, and a method for manufacturing the zoom lens.Type: ApplicationFiled: May 24, 2012Publication date: November 29, 2012Inventor: Mitsuaki WADA
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Patent number: 8238044Abstract: An imaging lens SL installed into such as an electronic still camera 1 includes, in order from an object side: a first lens group G1 having positive refractive power; a second lens group G2 having negative refractive power; a third lens group G3 having positive refractive power; and a fourth lens group G4 having positive refractive power; the second lens group G2 and the third lens group G3 move along an optical axis upon focusing from infinity to a close object, and a given conditional expression is satisfied, thereby providing a fast imaging lens capable of taking a picture from infinity to a close object with high optical performance, an optical apparatus equipped with the imaging lens, and a method for manufacturing the imaging lens.Type: GrantFiled: November 3, 2010Date of Patent: August 7, 2012Assignee: Nikon CorporationInventor: Mitsuaki Wada
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Publication number: 20110134538Abstract: Providing a close-up lens with superb optical performance capable of focusing from infinity to a close distance allowing a life-size magnification by an internal focusing system with small moving amounts of focusing lens groups, an imaging apparatus, and a method for focusing a close-up lens. The close-up lens includes four lens groups, and is able to focus an object with an imaging magnification from ?=0 through at least ?=?0.5, wherein upon focusing, a first lens group and a fourth lens group are fixed with respect to an image plane, and a second lens group and a third lens group are moved along an optical axis.Type: ApplicationFiled: February 17, 2011Publication date: June 9, 2011Inventor: Mitsuaki WADA
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Publication number: 20110109979Abstract: An imaging lens SL installed into such as an electronic still camera 1 includes, in order from an object side: a first lens group G1 having positive refractive power; a second lens group G2 having negative refractive power; a third lens group G3 having positive refractive power; and a fourth lens group G4 having positive refractive power; the second lens group G2 and the third lens group G3 move along an optical axis upon focusing from infinity to a close object, and a given conditional expression is satisfied, thereby providing a fast imaging lens capable of taking a picture from infinity to a close object with high optical performance, an optical apparatus equipped with the imaging lens, and a method for manufacturing the imaging lens.Type: ApplicationFiled: November 3, 2010Publication date: May 12, 2011Inventor: Mitsuaki WADA
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Patent number: 7898744Abstract: Providing a close-up lens with superb optical performance capable of focusing from infinity to a close distance allowing a life-size magnification by an internal focusing system with small moving amounts of focusing lens groups, an imaging apparatus, and a method for focusing a close-up lens. The close-up lens includes four lens groups, and is able to focus an object with an imaging magnification from ?=0 through at least ?=?0.5, wherein upon focusing, a first lens group and a fourth lens group are fixed with respect to an image plane, and a second lens group and a third lens group are moved along an optical axis.Type: GrantFiled: March 13, 2008Date of Patent: March 1, 2011Assignee: Nikon CorporationInventor: Mitsuaki Wada
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Publication number: 20080225406Abstract: Providing a close-up lens with superb optical performance capable of focusing from infinity to a close distance allowing a life-size magnification by an internal focusing system with small moving amounts of focusing lens groups, an imaging apparatus, and a method for focusing a close-up lens. The close-up lens includes four lens groups, and is able to focus an object with an imaging magnification from ?=0 through at least ?=?0.5, wherein upon focusing, a first lens group and a fourth lens group are fixed with respect to an image plane, and a second lens group and a third lens group are moved along an optical axis.Type: ApplicationFiled: March 13, 2008Publication date: September 18, 2008Inventor: Mitsuaki WADA
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Patent number: 7411745Abstract: The purpose is to provide a large-aperture-ratio internal focusing telephoto lens applicable to a wider photographing area by equipping a vibration reduction function capable to satisfactorily correct a camera shake and the like with securing superb optical performance. The large-aperture-ratio internal focusing telephoto lens includes, in order from an object, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, and a third lens group G3 having positive refractive power. The second lens group G2 is moved along an optical axis upon changing focus from infinity to a close-range object. The first lens group G1 has at least two cemented lenses and satisfies a given conditional expression. Either one of the cemented lens satisfies a given conditional expression.Type: GrantFiled: May 3, 2005Date of Patent: August 12, 2008Assignee: Nikon CorporationInventor: Mitsuaki Wada
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Publication number: 20050248857Abstract: The purpose is to provide a large-aperture-ratio internal focusing telephoto lens applicable to a wider photographing area by equipping a vibration reduction function capable to satisfactorily correct a camera shake and the like with securing superb optical performance. The large-aperture-ratio internal focusing telephoto lens includes, in order from an object, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, and a third lens group G3 having positive refractive power. The second lens group G2 is moved along an optical axis upon changing focus from infinity to a close-range object. The first lens group G1 has at least two cemented lenses and satisfies a given conditional expression. Either one of the cemented lens satisfies a given conditional expression.Type: ApplicationFiled: May 3, 2005Publication date: November 10, 2005Inventor: Mitsuaki Wada
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Patent number: 6705728Abstract: In order to observe a front eye portion of an eye (E) to be examined, when a frame is moved to within a first region to approach the eye E to be examined, a stereo angle converting portion as means for shifting an optical path and a color temperature converting element (61) as optical converting means are removed from right and left optical axes (L1 and L2). On the other hand, in order to observe an eye fundus portion of the eye (E) to be examined, when the frame is moved to within a second region to leave the eye (E) to be examined, the stereo angle converting portion and the color temperature converting element (61) are disposed on the right and left optical axes (L1 and L2).Type: GrantFiled: March 30, 2001Date of Patent: March 16, 2004Assignee: Kabushiki Kaisha TopconInventors: Tadashi Okamoto, Mitsuaki Wada, Takeyuki Kato, Masaki Ohno
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Publication number: 20010028441Abstract: In order to observe a front eye portion of an eye (E) to be examined, when a frame is moved to within a first region to approach the eye E to be examined, a stereo angle converting portion as means for shifting an optical path and a color temperature converting element (61) as optical converting means are removed from right and left optical axes (L1 and L2). On the other hand, in order to observe an eye fundus portion of the eye (E) to be examined, when the frame is moved to within a second region to leave the eye (E) to be examined, the stereo angle converting portion and the color temperature converting element (61) are disposed on the right and left optical axes (L1 and L2).Type: ApplicationFiled: March 30, 2001Publication date: October 11, 2001Applicant: KABUSHIKI KAISHA TOPCONInventors: Tadashi Okamoto, Mitsuaki Wada, Takeyuki kato, Masaki Ohno