Method of manufacturing a lead frame
AssigneeSharp Kabushiki Kaisha
InventorsHideya Takakura, Kazuo Kusuda, Hiroyuki Shoji
Life of this patent
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Abstract
A manufacturing method of an optical coupling device includes, preparing an elongated lead frame on which a plurality of tie bars are placed between a pair of side rails that are mutually in parallel with each other so as to orthogonally cross the tie bars, with a plurality of lead terminals being placed in a staggered form in a manner so as to orthogonally cross the tie bars, and laterally cutting the elongated lead frame to prepare a plurality of strap-shaped lead frames, in such a manner that the length of protrusion of a cut end of each of the side rails from each of the tie bars is made longer than the length of protrusion of a lead terminal from each of the tie bars.
Claims9
A manufacturing method of an optical coupling device, comprising:
- preparing an elongated lead frame on which a plurality of tie bars are placed between a pair of side rails that are mutually in parallel with each other so as to orthogonally cross the tie bars, with a plurality of lead terminals being placed in a staggered form in a manner so as to orthogonally cross the tie bars;
- and
- laterally cutting the elongated lead frame to prepare a plurality of strap-shaped lead frames, in such a manner that the length of protrusion of a cut end of each of the side rails from each of the tie bars is made longer than the length of protrusion of a lead terminal from each of the tie bars.
A manufacturing method of an optical coupling device, comprising:
- preparing an elongated lead frame on which a plurality of tie bars are placed between a pair of side rails that are mutually in parallel with each other so as to orthogonally cross the tie bars, with a plurality of lead terminals being placed in a staggered form in a manner so as to orthogonally cross the tie bars;
- laterally cutting the elongated lead frame to prepare a plurality of strap-shaped lead frames, in such a manner that the length of protrusion of a cut end of each of the side rails from each of the tie bars is made longer than the length of protrusion of a lead terminal from each of the tie bars;
- mounting a semiconductor element on a said strap-shaped lead frame;
- and
- sealing the resultant with a resin.
A manufacturing method of an optical coupling device, comprising:
- preparing an elongated lead frame on which a plurality of tie bars are placed between a pair of side rails that are mutually in parallel with each other so as to orthogonally cross the tie bars, with a plurality of lead terminals being placed in a staggered form in a manner so as to orthogonally cross the tie bars;
- laterally cutting the elongated lead frame to prepare a plurality of strap-shaped lead frames, in such a manner that the length of protrusion of a cut end of each of the side rails from each of the tie bars is made longer than the length of protrusion of a lead terminal from each of the tie bars;
- mounting a light-emitting element and a light-receiving element on a said strap-shaped lead frame;
- bending a tip of the lead frame, mounting thereon the light-emitting element and the light-receiving element, downward to form an obtuse angle with respect to the tie bars;
- and
- sealing the light-emitting element and the light-receiving element with a resin.
Dependencies are inferred from the claim text.