Method of making a wire bonded microfuse
AssigneeCooper Industries, Inc.
InventorLeon Gurevich
Life of this patent
Estimating the term…
Abstract
A microfuse (10) with a ceramic chip (12), thick film pads (14), fusible wire (16), attached to pads (14) without solder or flux, ceramic coating (18) and plastic body (20). External lead (24) configuration can be axial, radial or surface mount. The method of manufacturing the fuse (10) is improved by utilizing a wire bonding technique in order to improve the quality of the manufacturing process and increase the reliability in performance of the fuse and reduce manufacturing cost.
Claims38
A method of making a fuse element subassembly comprising the steps of:
- providing a substrate of insulating material;
- producing two separate metallized areas on the substrate;
- bonding one end of a fusible element to one of the separate metallized areas without using solder or flux;
- extending the fusible element across the substrate to the other of the separate metallized areas;
- bonding the other end of the fusible element to the other separate metallized area to electrically connect the metallized areas on the substrate;
- and
- attaching a lead to each one of the separate metallized areas without causing the lead to contact the fusible element.
A method of making a fuse comprising the steps of:
- providing a substrate of insulating material;
- producing two separate metallized areas on the substrate;
- bonding one end of a fusible element to one of the separate metallized areas without using solder of flux;
- extending the fusible element across the substrate to the other of the separate metallized areas;
- bonding the other end of the fusible element to the other separate metallized area to electrically connect the metallized areas on the substrate;
- attaching one lead to each of the metallized areas;
- coating the substrate with an insulating material;
- and
- injection molding the substrate, bonded fusible element, and leads in an insulating housing.
A method of making a fuse comprising the steps of:
- providing a substrate of insulating material;
- producing two separate metallized areas on the substrate;
- bonding one end of a fusible element to one of the separate metallized areas without using solder or flux;
- extending the fusible element across the substrate to the other of the separate metallized areas;
- bonding the other end of the fusible element to the other separate metallized area to electrically connect the metallized areas on the substrate;
- attaching one lead to each of the metallized areas;
- and
- applying an arc quenching material only to that portion of the substrate having the metallized areas and fusible element.
Dependencies are inferred from the claim text.