Quick change precisor
AssigneeMicron Technology, Inc.
InventorsRich Fogal, Michael B. Ball, Ronald W. Ellis
Life of this patent
Estimating the term…
Abstract
A precisor plate for an automatic wire bonder having a heat block attachment portion thereon to precisely attach a heat block thereto provides a simple and quickly adjustable precisor plate and method of alignment. The precisor plate includes fixed alignment pins to align the precisor plate relative to a lead frame in an automatic wire bonding machine. In a preferred embodiment, the heat block is integral with the precisor plate and includes internal bores and or passageways for receiving a heating element, a thermocouple, and/or a vacuum source.
Claims20
A work holder in a wire bonding machine, comprising:
- a bottom plate having a first rail guide at a first side thereof and a second, parallel rail guide at a second side thereof;
- a first side rail and a second side rail, said first side rail engaging said first rail guide and said second side rail engaging said second rail guide, said second side rail defining a precisor plate-receiving opening therethrough;
- a top plate having a bottom surface received on said first and second side rails;
- a vertical slide positioned proximate said second side rail;
- a precisor plate attached to said vertical slide and extending through said precisor plate-receiving opening;
- and
- a heat block attached to said precisor plate having a top surface positioned below said bottom surface of said top plate.
A heat block for a wire bonding machine having a precisor plate attached thereto comprising:
- a heat block having an attachment surface defining at least one precisor alignment member-receiving portion and an abutment surface for abutting a surface of the precisor plate.
A kit for a precisor plate used in a wire bonding machine, comprising:
- a precisor plate having a heat block attachment portion thereon;
- a heat block for attaching to said heat block attachment portion;
- and
- a pair of alignment pins to be fixedly attached to said precisor plate and spaced to engage tooling holes in a lead frame.
A method of wire bonding a first plurality of lead frames and a second plurality of lead frames, each having indexing holes therein, comprising:
- wire bonding the first plurality of lead frames with a wire bonding machine having a precisor plate in a first position, the precisor plate having at least two alignment pins attached thereto;
- changing the position of the precisor plate by loosening the precisor plate from the wire bonding machine so that the precisor plate can be moved relative to a slider;
- raising the precisor plate until the at least two alignment pins of the precisor plate engage the indexing holes of a lead frame of a second plurality of lead frames;
- moving the precisor plate relative to the second plurality of lead frames until the at least two alignment pins precisely engage the indexing holes of the lead frame of the second plurality of lead frames without substantial contact therewith;
- fastening the precisor plate to the wire bonding machine;
- and
- wire bonding the second plurality of lead frames.
Dependencies are inferred from the claim text.