Patents by Inventor Yuji Sako
Yuji Sako 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).
-
Publication number: 20240113208Abstract: A semiconductor device according to an aspect of the present disclosure, includes a semiconductor layer in which a trench is formed, a buried electrode provided inside the trench, an upper electrode provided above the buried electrode inside the trench, an insulating film provided inside the trench, a first electrode provided on an upper surface of the semiconductor layer, and a second electrode provided on a lower surface of the semiconductor layer, wherein the insulating film includes a first portion between the buried electrode and a side wall of the trench, a second portion between the upper electrode and the side wall of the trench, and a third portion between the buried electrode and the upper electrode, and a lower surface of the upper electrode has a dent in a central portion.Type: ApplicationFiled: March 8, 2023Publication date: April 4, 2024Applicant: Mitsubishi Electric CorporationInventors: Kohei SAKO, Yuji EBIIKE, Kazuya INOUE
-
Patent number: 5767762Abstract: An accelerating mechanism in an overcurrent relay for accelerating the speed of moving operation of a resetting bar or the speed of motion in a normally closed contact caused by the resetting bar. In the application of the relay to any resetting mechanism, which effects resetting with a movement of the resetting bar, the relay can eliminate a very hazardous abnormal operation that a resetting operation is stored in a toggle mechanism, thus improving the safety of the resetting mechanism.Type: GrantFiled: March 9, 1994Date of Patent: June 16, 1998Assignees: Mitsubishi Denki Engineering Kabushiki Kaisha, Mitsubishi Denki Kabushiki KaishaInventor: Yuji Sako
-
Patent number: 5535083Abstract: A magnetic coil assembly with a connector arrangement which prevents explosion or other accident due to the mismatch of voltage rating between a surge absorber and a magnetic coil, allows only the surge absorber to be changed easily if it has been damaged, and ensures ease of automatically assembling the surge absorber into the magnetic coil assembly. The magnetic coil assembly includes a coil spool, a winding wound around the coil spool, and coil terminals mounted on the coil spool and electrically connected with the winding. The surge absorber is connected mechanically and removably with the coil spool or coil terminals, using connectors that may uniquely relate to the ratings of the absorber and coil, and the absorber terminals of the surge absorber are brought into contact with, and therefore are electrically connected with, the coil terminals.Type: GrantFiled: January 28, 1993Date of Patent: July 9, 1996Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yuji Sako, Shigeharu Ootsuka
-
Patent number: 5376024Abstract: The present invention relates to a terminal connecting device which simplifies and facilitates achieving the proper alignment between a male-threaded portion of a terminal screw and a female-threaded hole of a stationary terminal, and moreover, which assures that a fastening operation is easily performed. The terminal connecting device includes a terminal screw guiding member adapted to be displaced along a side wall, the terminal screw being engaged with the terminal screw guiding member. The terminal screw or the terminal screw guiding member may also be supported by the resilient action of an elastic member of which one end is supported by the side wall. Alternatively, the terminal screws may be housed in a housing which is slidably attached to the side wall and which may be locked in place with the aid of a resilient member and latching apparatus.Type: GrantFiled: June 30, 1993Date of Patent: December 27, 1994Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yuji Sako, Shigeharu Ohtsuka, Hiroyuki Okado, Naoki Itoh
-
Patent number: 5266058Abstract: The present invention relates to a terminal connecting device which simplifies and facilitates achieving the proper alignment between a male-threaded portion of a terminal screw and a female-threaded hole of a stationary terminal, and moreover, which assures that a fastening operation is easily performed. The terminal connecting device includes a terminal screw guiding member adapted to be displaced along a side wall, the terminal screw being engaged with the terminal screw guiding member. The terminal screw or the terminal screw guiding member may also be supported by the resilient action of an elastic member of which one end is supported by the side wall. Alternatively, the terminal screws may be housed in a housing which is slidably attached to the side wall and which may be locked in place with the aid of a resilient member and latching apparatus.Type: GrantFiled: September 30, 1992Date of Patent: November 30, 1993Assignee: Mitsubishi Denki K.K.Inventors: Yuji Sako, Shigeharu Ohtsuka, Hiroyuki Okado, Naoki Itoh
-
Patent number: 5264985Abstract: Electrical equipment coupled to a printed circuit board provides insulation ribs projecting from a face between terminal plates provided on an upper face of the electrical equipment. The insulation ribs are inserted into oblong holes of the printed circuit board when the electrical equipment is coupled to the printed circuit board. As a result, insulation distances, namely creepage distance, between the terminal plates are along the height of the insulation ribs projecting from the upper face of the terminal plates.Type: GrantFiled: November 5, 1991Date of Patent: November 23, 1993Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yuji Sako, Shigeharu Ootsuka
-
Patent number: 4969844Abstract: An electromagnetic contactor comprises a resin-molded housing for accommodating a fixed contact member in its inner space; resin-molded terminal covers, each being capable of insertion from the outside for assembly along a guide portion of a recess or boss formed in the housing and of passing through the housing up to its inner space, each terminal cover having a slit opened to the outside; and fixed-contact-member connection conductors, each formed of a bent metal plate having a contact of the fixed contact member at one end and the plug-in connection type male terminal at the other end, the plug-in connection type male terminal being projected from the slit, the fixed-contact-member connection conductor being further provided with a mating portion which mates with the terminal cover in such a manner that the conductor in combination with the terminal cover can be assembled in the housing.Type: GrantFiled: September 29, 1989Date of Patent: November 13, 1990Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yuji Sako, Shigeharu Ootsuka
-
Patent number: 4954668Abstract: In a resetting apparatus having an inner cable one end of which confronts a reset button of an appliance mounted inside a control panel and the other end of which is connected with a push button protruded outside the control panel, and an outer cable which envelops the inner cable and which is fixed to a front of the control panel at one end therof and to the appliance at the other end thereof, the push button being depressed thereby to depress the reset button of the appliance; an apparatus for resetting an appliance characterized in that the inner cable is made of an optical conductor, and that a light emitting device is mounted in the reset button of the appliance.Type: GrantFiled: July 22, 1988Date of Patent: September 4, 1990Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Yuji Sako
-
Patent number: 4845455Abstract: Disclosed herewith is a thermally-sensible overcurrent protective relay, which comprises normally-closed contact means, operation means, a plurality of bimetals, a communicating plate, a heater mounted on each bimetal and electrically coupled to at least one of main circuit terminals for a power-source side and a load side, a bimetal retainer electrically coupled to the other main circuit terminal, a first groove, a second groove and a heater holder having a pin fitted in a through hole formed in the bimetal retainer. The operation means opens or closes the normally-closed contact means. The same current as flows through a main circuit to be controlled flows through the bimetals. The communicating plate transmits mechanical deforming force of the bimetals to the operation means so as to open the normally-closed contact means. The heater, when generating heat, causes a mechanical deformation on the bimetals. The bimetal retainer secures one end of each bimetal.Type: GrantFiled: November 24, 1987Date of Patent: July 4, 1989Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yuji Sako, Shigeharu Ootsuka
-
Patent number: 4808961Abstract: In an overcurrent protective relay thermally operable by a bimetal, a movable contact mechanism is employed by utilizing a snap inversion mechanism. A normally-closed contact is employed with having an overtravel to achieve the reliable contacting. A manually resettable lever is also employed to open the normally-closed contact after the overcurrent protective relay has been actuated.Type: GrantFiled: October 16, 1987Date of Patent: February 28, 1989Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yuji Sako, Kiyohide Tsutsumi, Shigeharu Ootsuka
-
Patent number: 4788518Abstract: A thermally-sensitive overcurrent protective relay includes a housing case, a bimetal strip bendable in response to an operating current flowing through a control circuit of the overcurrent protective relay, and a movable contact biased by a spring to form a toggle mechanism operable in response to the bending action of the bimetal. A lever supporting bracket mechanically supports the movable contact at a fulcrum portion and electrically connects the movable contact to a terminal. The terminal is mounted in the housing case to conduct current to the control circuit through a contact spring for electrically connecting the lever supporting bracket. This lever supporting member includes a trip current adjusting mechanism adapted to be rotated at its end portion by turning an adjusting screw for adjustment of the operation current.Type: GrantFiled: October 16, 1987Date of Patent: November 29, 1988Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yuji Sako, Haruhiko Ito, Mineo Sano
-
Patent number: 4785274Abstract: A thermally-sensible overcurrent protective relay comprising a toggle mechanism operable in connection with the bending operation of a bimetal bendable in response to current flowing through a main circuit a normally-open contact having a normally-open fixed contact element and a normally-open movable contact element both formed by a resilient conductive thin plate having a contact portion at one end thereof a normally-closed contact having a normally-closed fixed contact element and a normally-closed movable contact element both formed by a resilient conductive thin plate having a contact portion at one end thereof, and a mechanism adapted to be selected to an automatic resetting position and a manual resetting position in such a manner as to contact one surface of the contact portion of the normally-open fixed contact element at one end of a changeover lever pivotally rotatable to displace the normally-open fixed contact element toward the normally-open movable contact element and retain the normally-open cType: GrantFiled: October 16, 1987Date of Patent: November 15, 1988Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yuji Sako, Haruhiko Ito, Mineo Sano
-
Patent number: 4671697Abstract: An apparatus for mounting an electromagnetic unit on a frame includes a mounting recess at the bottom of the main body of the electromagnetic unit, a guide recess which is communicated with the mounting recess at one side thereof so that it is normal to the mounting recess, and a slidable member which is slidably inserted into the guide recess and normally biased toward the mounting recess by means of a spring supported by a projection disposed in the guide recess, the improvement comprising a stopper disposed in a hole formed in the slidable member, which opposes the spring bearing in the guide recess. The stopper in the hole also serves as a spring guide.Type: GrantFiled: May 7, 1985Date of Patent: June 9, 1987Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Isao Ando, Hiroaki Tazawa, Yuji Sako, Shigeharu Ootsuka, Yuji Mizuno, Kosaku Ikeda
-
Patent number: 4654744Abstract: An electromagnetic contactor for controlling the opening and closing of an electric circuit for an electric motor or the like, including a mounting pedestal including a rectifier circuit therein, a stationary iron core disposed thereon and having an operating coil wound around the same, and a movable iron core disposed oppositely to this stationary iron core to be spaced therefrom by a predetermined spacing thereby to change an AC voltage applied to the operating coil to a direct current. The stationary iron core is composed of a bar-shaped magnetic member while the movable iron core is substantially U-shaped.Type: GrantFiled: May 2, 1984Date of Patent: March 31, 1987Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Hiroyuki Okado, Shizutaka Nishizako, Yuji Sako, Masahiro Kakizoe
-
Patent number: 4652847Abstract: In the thermal-type overload relay such a construction that a bimetallic strip deforms due to heat produced by an excessive amount of current to actuate a normally closed movable contact which constitutes a normally closed contact, and an operating rod is moved in a predetermined direction to thereby close a normally open contact comprising a normally open fixed contact and a normally open movable contact, there is provided a reset rod moving in the direction perpendicular to the operating rod so that when the reset rod is moved in the direction perpendicular to the operating rod, the normally open fixed contact are caused to move toward the normally open movable contact, whereby the normally open contact is returned to the original position, and the normally closed contact is also returned to the original position by a returning movement of the normally closed movable contact due to the returning movement of the operating rod.Type: GrantFiled: March 24, 1986Date of Patent: March 24, 1987Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Yuji Sako
-
Patent number: 4642597Abstract: An overcurrent relay comprises a housing having an external portion, an overcurrent responsive mechanism, disposed within the housing, for opening or closing a pair of contacts in response to an overcurrent, an adjusting screw device for adjusting the operating current of the overcurrent responsive mechanism, the adjusting screw device being rotatably supported by the housing and having serrations on the periphery thereof, and an engaging member mounted on the external portion of the housing for engaging with a serration of the adjusting screw device for preventing an unintentional rotation of the adjusting screw device.Type: GrantFiled: December 5, 1985Date of Patent: February 10, 1987Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Yuji Sako
-
Patent number: 4642429Abstract: A switch characterized by a stationary contact element joined to a stationary contact, a movable contact element joined to a movable contact in a facing relationship to said stationary contact element, a first metallic arc extinguishing plate formed of a U-shaped vertical wall and disposed with its open end facing toward a tip of said stationary contact and which surround said stationary contact element, and a second metallic arc extinguishing plate disposed in parallel to and at the remote side from said contact elements of said first metallic arc extinguishing plate, said first metallic arc extinguishing plates being disposed at predetermined gaps relative to said stationary contact.Type: GrantFiled: July 2, 1984Date of Patent: February 10, 1987Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Teijiro Mori, Yuichi Wada, Yuji Sako, Hiroaki Tazawa, Hiroyuki Okado
-
Patent number: 4635020Abstract: A thermal-type over load relay having an improved contact operating mechanism whereby testing of the operation of the relay is made easy, malfunctions due to mechanical shock or the like are substantially eliminated, and the overall size of the relay is reduced. A thermal element is provided for opening normally closed contacts of the relay in response to heat produced by a heater through which a main circuit current flows. An operating rod is provided for closing the normally open contacts in response to the operation of a normally closed contact mechanism when the normally closed contacts are opened by the operation of the thermal element. The operating rod may be operated from the exterior of the housing of the relay for testing purposes.Type: GrantFiled: June 6, 1985Date of Patent: January 6, 1987Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Yuji Sako
-
Patent number: 4506243Abstract: The disclosed electromagnetic contactor has a base including a lateral opening and an internal space, and two rails disposed at the bottom of the internal space. A U-shaped stationary iron core including two guides on both sides is assembled into a coil holder so that one leg of the "U" is surrounded by an operating coil held by the coil holder. Then the coil holder is inserted into the internal space in the base through the lateral opening with the guides engaging the rails until it is removably positioned in the internal space.Type: GrantFiled: May 24, 1982Date of Patent: March 19, 1985Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Hiroyuki Okado, Masahiro Kakizoe, Shigeharu Otsuka, Yuji Sako
-
Patent number: D317438Type: GrantFiled: December 9, 1988Date of Patent: June 11, 1991Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Yuji Sako