Surface-mounted resistor
AssigneeKoa Corporation
InventorsDaigo Hayashi, Jun Ito, Yuko Tezuka
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Abstract
A highly reliable surface-mounted resistor, which prevents a problem of disconnection between an electrode and a terminal of a chip resistor when heating during mounting, is disclosed. The surface-mounted resistor includes a chip resistor comprising a plate-shaped substrate, a resistance body formed on an upper surface of the substrate, and an electrode connected the resistance body and drawn from the upper surface of the substrate to a lower surface via an end surface, a plate-shaped lead terminal connected to the electrode of the chip resistor, the plate-shaped lead terminal being fixed to the electrode of the substrate on the lower surface side, and an exterior member covering an entire chip resistor and a part of the lead terminal.
Claims3
A surface-mounted resistor comprising:
- a chip resistor comprising a plate-shaped substrate, a resistance body formed on an upper surface of the substrate, and an electrode connected the resistance body and drawn from the upper surface of the substrate to a lower surface of the substrate via an end surface;
- a plate-shaped lead terminal connected to the electrode, the lead terminal comprising a chip-resistor-connecting portion;
- and
- a molded exterior member,
- wherein the chip-resistor-connecting portion has an L-shape extending along the electrode on the lower surface side and the end surface side of the substrate, and is fixed by an L-shaped solder formed along the electrode on the lower surface side and the end surface side of the substrate,
- wherein the exterior member covers an entire chip resistor including the electrode on the lower surface side and the end surface side of the substrate, the chip-resistor-connecting portion of the lead terminal, and the solder, and
- wherein the lead terminal comprises:
- a lead-terminal-connecting portion that extends from the chip-resistor-connecting portion to an outside of the exterior member, and bends downward, and extends along a side surface of the exterior member;
- and
- a printed-substrate-connecting portion that extends from the lead-terminal-connecting portion to a lower side of the exterior member, bends downward, and extends along a lower surface of the exterior member.
A method for manufacturing of a surface-mounted resistor comprising:
- preparing a lead frame and processing the lead frame into a pair of comb shape to form a comb-teeth portion;
- arranging the lead frame so that tip sides of the comb-teeth portion faces inward;
- bending the comb-teeth portion to form an L-shaped chip-resistor-connecting portion along an electrode on a lower surface side and an end surface side of a substrate for placing a chip resistor;
- applying a solder material to the chip-resistor-connecting portion, and placing the electrode of the chip resistor on the chip-resistor-connecting portion to solder the electrode on the lower surface side and the end surface side of the substrate and the chip-resistor-connecting portion in an L-shape by heating;
- covering an entire chip resistor, the chip-resistor-connecting portion of the comb-teeth portion, and the solder with a molded exterior member to protrude a portion of the comb-teeth portion not covered by the exterior member from a side surface of the exterior member;
- cutting and bending the comb-teeth portion downward along the side surface of the exterior member to form a portion protruding from the lower surface of the exterior member;
- and
- bending the portion protruding from the lower surface of the exterior member to form a printed-substrate-connecting portion extending along the lower surface of the exterior member.
Dependencies are inferred from the claim text.