Patent ID: 6906750

Claim:
An optical apparatus comprising: a substrate having a first surface, a second surface opposite to said first surface, and a light passage formed through said first and second surfaces; an optical semiconductor device including a semiconductor package including a base wall, a surrounding wall extending from a periphery of said base wall and cooperating with said base wall to form a chip-receiving space, and a cover member disposed opposite to said base wall and secured to said surrounding wall for closing said chip-receiving space, said cover member having a wall-connecting surface connected to said surrounding wall and a substrate-abutting surface that abuts directly against said first surface of said substrate, said cover member having a light-guiding portion that is optically aligned with said light passage to permit passage of light into said chip-receiving space, a lead frame including a chip carrier mounted on said base wall in said chip-receiving space, and a plurality of leads, each of which has a chip-connecting portion disposed in said chip-receiving space, and a substrate-connecting portion extending through said surrounding wall and mounted on said substrate to secure said optical semiconductor device on said first surface of said substrate, and an optical semiconductor chip having a carrier-mounting portion and a light-sensing portion opposite to said carrier-mounting portion, said carrier-mounting portion being mounted on said chip carrier such that said light-sensing portion is optically aligned with said light guiding portion, said optical semiconductor chip being connected electrically to said chip-connecting portions of said leads such that electrical connection between said optical semiconductor chip and said substrate is possible through said leads; and a lens assembly including a lens frame and a lens set mounted in said lens frame, said lens frame having a mounting surface mounted on said second surface of said substrate such that said lens set is optically aligned with said light passage; wherein said surrounding wall has a height and said cover member has a thickness that cooperate to form an optimum optical distance between said lens set and said light-sensing portion of said optical semiconductor chip.