Coil device, pulse transformer, and electronic component
To provide a coil device having high bonding strength and bonding reliability. The coil device 1 has a core member 10 having a winding core and a flange 12 , a wire 32 wound around the winding core, and a terminal electrode 52 connected with a lead 32 a of a wire 32 provided to the flange 12 ; and an easy bonding layer 70 is formed on the surface of the terminal electrode 52 connected with the lead 32 a in a stripe form 70 a . the stripe form each bonding layer 70 a is formed as a laser mark 71 . In the coil device 1 , a residue of coating film 78 which may be generated when the lead 32 a of the wire 32 is connected to the mounting part 65 of the terminal electrode 52 is removed by laser.
1. A coil device comprising:
a core member having a winding core and a flange;
a wire wound around the winding core; and
a terminal electrode provided to the flange and connected with a lead of the wire, wherein
the terminal electrode is a preformed metal board member,
an easy bonding layer is formed in a stripe form to a surface of the terminal electrode connected with the lead,
the terminal electrode includes, in order, a substrate, an underlayer and at least one layer above the underlayer,
the easy bonding layer is formed in an outermost layer included in the at least one layer above the underlayer of the terminal electrode, and
the underlayer is not exposed to an outermost surface of the terminal electrode.
2. The coil device according to claim 1 , wherein the easy bonding layer of the stripe form is on the surface of the terminal electrode as a laser mark.
3. The coil device according to claim 1 , wherein a longitudinal direction of the easy bonding layer of the stripe form matches with a longitudinal direction of the lead.
4. The coil device according to claim 3 , wherein the easy bonding layer is formed to both sides of the lead.
5. A pulse transformer having a coil device according to claim 1 .
6. A coil device comprising:
a core member having a winding core and a flange;
a wire wound around the winding core; and
a terminal electrode provided to the flange and connected with a lead of the wire, wherein
the terminal electrodes is directly formed to a flat and smooth outer surface of the flange,
a stripe form laser mark is formed to a surface of the terminal electrode connected with the lead,
the terminal electrode includes, in order, a substrate, an underlayer and at least one layer above the underlayer,
the stripe form laser mark is formed in an outermost layer included in the at least one layer above the underlayer of the terminal electrode, and
the underlayer is not exposed to an outermost surface of the terminal electrode.
7. An electronic component comprising:
an element body having a lead extending towards outside; and
a terminal electrode provided to an outer face of the element body, wherein
the terminal electrode is a preformed metal board member,
an easy bonding layer is formed in a stripe form to a surface of the terminal electrode connected with the lead,
the terminal electrode includes, in order, a substrate, an underlayer and at least one layer above the underlayer,
the easy bonding layer is formed in an outermost layer included in the at least one layer above the underlayer of the terminal electrode, and
the underlayer is not exposed to an outermost surface of the terminal electrode.