Abstract: The present invention provides a contact mechanism that is capable of, without enlarging the entire configuration thereof, preventing the generation of an electromagnetic repulsion that opens a movable contact upon application of a current, and also provides an electromagnetic contactor that uses this contact mechanism. A contact mechanism (CM) has a fixed contact (2) and a movable contact (3) that are inserted in a current-carrying path. In the contact mechanism (CM), at least either the fixed contact (2) or the movable contact (3) is formed into an L-shape or a U-shape so as to generate a Lorentz force that acts against an electromagnetic repulsion in an opening direction, which is generated between the fixed contact (2) and the movable contact (3) upon application of a current.

Abstract: There is provided an electromagnetic contactor unit capable of firmly connecting electromagnetic contactors without influencing outer dimensions when the electromagnetic contactors are connected to each other. The electromagnetic contactor unit connected at least two juxtaposed electromagnetic contactors (2a, 2b) with a connection piece (42). The electromagnetic contactor includes an attachment hole (41a) formed in each corner of an attachment plate portion, a piece accommodation concave portion (43) fitting a half portion of the connection piece formed above the attachment hole and accommodating within an outer dimension, and is opened to a connection surface with the adjacent electromagnetic contactor, and a locking portion (44) locking the connection piece formed in the piece accommodation concave portion.

Abstract: An electromagnetic contactor has a contact device including a contact housing for housing a pair of fixed contact pieces and a movable contact piece disposed to contact with and separate away from the pair of fixed contact pieces, a pair of arc-extinguishing inner permanent magnets disposed on inner peripheral surfaces of the contact housing, and a pair of arc-extinguishing outer permanent magnets disposed on outer peripheral surfaces of the contact housing at a section facing the arc-extinguishing inner permanent magnets. Magnetic pole surfaces of the arc-extinguishing inner permanent magnets are arranged in a close vicinity of the movable contact piece and are magnetized to have the same polarity facing each other. The arc-extinguishing outer permanent magnets are magnetized in the same direction as the arc-extinguishing inner permanent magnets disposed nearby and coercive force of the arc-extinguishing outer permanent magnets is greater than of that the arc-extinguishing inner permanent magnets.

Abstract: The present invention provides a contact device capable of narrowing a gap between a fixed contactor and a movable contactor and reducing the number of parts and the production costs, and an electromagnetic switch that uses the contact device. The contact device has a pair of columnar fixed contactors (6a, 6b) which are fixed to a surface of an insulation airtight container (4) while keeping a predetermined space therebetween, each having at least a tip end contact surface protruding into the insulation container; a movable contactor (11) that is disposed so as to be capable of contacting with and separating from the pair of fixed contactors (6a, 6b); and a pair of arc extinguishing annular permanent magnets (9a, 9b) which is respectively attached to outer circumferential surfaces of the pair of fixed contactors (6a, 6b) and drives an arc outwardly.

Abstract: There is provided a drive lever incorrect assembly detection portion (9d) and (14) which causes another end portion (9a) of a drive lever (9) to protrude to a position, of a case (4), to which a cover (5) is attached such that the cover (5) cannot be attached to the case (4) in a state where the drive lever (9) is assembled in an incorrect direction.

Abstract: There is provided a drive lever incorrect assembly detection portion (9d) and (14) which causes another end portion (9a) of a drive lever (9) to protrude to a position, of a case (4), to which a cover (5) is attached such that the cover (5) cannot be attached to the case (4) in a state where the drive lever (9) is assembled in an incorrect direction.

Abstract: A life prediction method of an electronic device in which the life prediction accuracy is more improved than that in a related art technique, and a design method of an electronic device based on the above method, are established. Life prediction is performed by incorporating either of a change in a physical property of a solder joint portion and a change in the fatigue life of a solder, the changes occurring when left at a high temperature. The change in a physical property of the solder joint portion or the change in the fatigue life of the solder is determined from the relationship between a heat treatment temperature and a heat treatment time. These changes are then formulated to be incorporated into the life prediction.

Abstract: The present invention provides a contact device capable of narrowing a gap between a fixed contactor and a movable contactor and reducing the number of parts and the production costs, and an electromagnetic switch that uses the contact device. The contact device has a pair of columnar fixed contactors (6a, 6b) which are fixed to a surface of an insulation airtight container (4) while keeping a predetermined space therebetween, each having at least a tip end contact surface protruding into the insulation container; a movable contactor (11) that is disposed so as to be capable of contacting with and separating from the pair of fixed contactors (6a, 6b); and a pair of arc extinguishing annular permanent magnets (9a, 9b) which is respectively attached to outer circumferential surfaces of the pair of fixed contactors (6a, 6b) and drives an arc outwardly.

Abstract: Two electromagnetic contact devices 1a, 1b are arranged adjacently, a reversible unit 2 is detachably mounted on these electromagnetic contact devices, and two auxiliary contact point units 4a, 4b are detachably mounted on the reversible unit. In addition, two surge absorption units 3a, 3b are detachably mounted on the electromagnetic contact devices.

Abstract: In a state where an adhesive tape is attached onto a main surface of a semiconductor wafer, a trench is formed in a rear surface of the semiconductor wafer. For forming the trench in the rear surface of the semiconductor wafer, after coating a resist film on the rear surface of the semiconductor wafer, the resist film is patterned by using the photolithography technology. The patterning of the resist film is performed so as not to leave the resist film in the region where the trench is to be formed. Then, the trench is formed in a predetermined region of the semiconductor wafer by the dry etching technology using the patterned resist film as a mask. Specifically, the trench is formed in the region near the dicing line.

Abstract: A plurality of terminal chambers (20a) to (20e) is formed in a housing (16) by using a plurality of partition walls (24a) to (24e) to partition. In the terminal chambers, fixed contactors (31) each having a fixed contact point (31d) and a terminal screw (31a) are mounted. Engaged portions (31b) are formed integrally with the fixed contactors. Further, a press-fit engaging portion (26) is provided in each of the terminal chambers. The terminal chamber is formed as a space different from a space accommodating a movable contact point support, and the press-fit engaging portion is engaged by the engaged portion by press-fitting.

Abstract: A reversible unit (10) is attached by being mounted over a pair of adjacently disposed electromagnetic contactors (1a) and (1b). The reversible unit (10) includes a pair of interlock plates (11) and (12), a lock piece (13), and a unit case (10b) accommodating the pair of interlock plates (11) and (12) and the lock piece (13). The lock piece (13) rotates in a first direction with the movement of one of the interlock plates (12) in a turn-on operation of one of the electromagnetic contactors (1a) to prevent the movement of the other interlock plate (11), and rotates in a second direction different from the first direction with the movement of the other interlock plate (11) in a turn-on operation of the other electromagnetic contactor (1b) to prevent the movement of one of the interlock plates (12). The unit case (10b) is provided with a lock piece display window (10g) which allows determination of the rotation of the lock piece (13) in the first direction or the second direction.

Abstract: An electromagnetic switch has a contact device having a pair of fixed contacts fixed thereof and maintaining a predetermined interval inside an arc-extinguishing chamber receptacle, and a movable contact disposed to be connectable with the pair of fixed contacts; and an electromagnetic device driving the movable contact. The electromagnetic device has a cylindrical exciting coil, a fixed core passing through center of the exciting coil, a magnetic yoke covering an outer side of the exciting coil, and a movable core facing the fixed core and the magnetic yoke, and armature surfaces of the fixed core and the magnetic yoke are formed on a side of the contact device than the exciting coil.

Abstract: A wafer (or a circuit board), which is used to perform three-dimensional mounting, has protrusion 20 which is provided in low melting point metal 15 for electrically connecting mutually joined wafers 61 and 62, and which defines an interval between mutually joined wafers 61 and 62 without being deformed at the time when low melting point metal 15 is melted. A joining structure of wafers 61 and 62 is manufactured by using wafers 61 and 62, at least one of which has protrusion 20. In the manufactured joining structure of wafers 61 and 62, wafers 61 and 62 are electrically connected to each other by low melting point metal 15, and protrusion 20, which defines the interval between wafers 61 and 62 without being deformed at the time when low melting point metal 15 is melted, is provided in low melting point metal 15.

Abstract: Within a case (4), are accommodated an electromagnet (8) having a fixed core (8c) and a movable core (8d) capable of contacting and separating from the fixed core (8c); a movable contact point support (7a) which moves in parallel with the movable core; a return spring (7b) which causes the movable contact point support to return to an initial position; and a driving lever (9) which rotates with a rotation support point portion (9a) provided on one end thereof as a support point, and which transmits attraction movement and release movement of the movable core to the movable contact point support. The rotation support point portion of the driving lever is fitted into and supported by a support point recess (5a) provided in an inner face of an extinction cover (5) mounted on the case.

Abstract: An electromagnetic contactor (1a) is provided with an erroneous mounting prevention unit (8) which permits an entry of a connection piece when a connection piece (6f) of a reversible unit (6) attempts to enter a normal position (NP) inside a display window (3a) where the connection piece is connectable to an operation display piece (4a), and prevents the entry of the connection piece when the connection piece attempts to enter a position inside the display window (3a) deviated from the normal position (NP).

Abstract: A reversible unit (20) has a pair of interlock plates (21, 22) detachably connected to operation indication pieces (4a, 4b) of a pair of electromagnetic contactors (1a, 1b) and moving in the same direction as the moving direction of the operation indication pieces, a lock piece (23) connecting with the pair of interlock plates (21, 22), a first normally-closed contact (24), and a second normally-closed contact (25). In a closing operation of one of the electromagnetic contactors (1a), the lock piece (23) moves one of the interlock plates (21) and prohibits the movement of the other interlock plate (22). The first normally-closed contact (24) is connected in series in a power supply circuit to an exciting coil (6b) of the other electromagnetic contactor (1b). One of the interlock plates (21) has a first opening operation engagement portion (34) releasing the first normally-closed contact (24) when the interlock plate (21) moves.

Abstract: A mounting unit for an electromagnetic contactor can prevent erroneous mounting of a non-mountable unit in a state in which a mountable unit is mounted on a case-side mounting portion, and a connection structure of an electromagnetic contactor uses the mounting unit. A mounting unit (3) for an electromagnetic contactor can be mounted on electromagnetic contactors (2a, 2b) having on a unit attaching portion (6b) a contactor-side mounting preventing portion (6f) that prevents mounting by engagement when a non-mountable unit, which cannot be mounted, is mounted. In the mounting unit (3), a unit main body (39) is provided with a mounting preventing transfer member (51) that forms a unit-side mounting preventing portion (54) that engages with a contactor-side mounting preventing portion (6f) when mounted on the electromagnetic contactors (2a, 2b) and prevents mounting of the non-mountable unit on a unit mounting portion (3g) onto which the non-mountable units (5a, 5b) are mounted.

Abstract: The electromagnetic contactor enables a reliable return to a pole open position without increasing the spring force of a return spring. In an electromagnetic contactor, an electromagnetic device having an exciting coil and a contact mechanism having a return spring are disposed in parallel, and the electromagnetic device and contact mechanism are linked by a drive lever. The electromagnetic device has a polarized electromagnet having a magnetic circuit that includes a permanent magnet generating a suction force that moves the contact mechanism to a pole open position side when the exciting coil is not energized. The drive lever is fixed to either one of the electromagnetic device or contact mechanism and contacts with the other with no gap at least when the contact mechanism is moved to the pole open position side. The return force of the contact mechanism is covered by the suction force of the permanent magnet.

Abstract: There is provided an electromagnetic contactor unit capable of firmly connecting electromagnetic contactors without influencing outer dimensions when the electromagnetic contactors are connected to each other. The electromagnetic contactor unit connected at least two juxtaposed electromagnetic contactors (2a, 2b) with a connection piece (42). The electromagnetic contactor includes an attachment hole (41a) formed in each corner of an attachment plate portion, a piece accommodation concave portion (43) fitting a half portion of the connection piece formed above the attachment hole and accommodating within an outer dimension, and is opened to a connection surface with the adjacent electromagnetic contactor, and a locking portion (44) locking the connection piece formed in the piece accommodation concave portion.