Flexible printhead circuit
View Patent ↗A flexible circuit for use within a printhead assembly and to connect a printhead body to an external circuit includes a substantially planar portion having one or more layers of conductive material and having a top surface substantially parallel to a top surface of the printhead body. One or more integrated circuits can be mounted onto the planar portion. Multiple leads extend from each integrated circuit, the leads electrically connected to the printhead body. One or more arms are attached to, and substantially perpendicular to, the planar portion, each arm including one or more external connectors configured to connect to the external circuit.
1. A circuit to connect a printhead body to an external circuit, the circuit comprising:
a substantially planar portion including one or more layers of conductive material and having a top surface substantially parallel to a top surface of the printhead body, the planar portion including:
a central portion; and
two distal portions on either side of the central portion;
where the two distal portions are attached to the top surface of the printhead body and the central portion is raised from and positioned directly over the top surface of the printhead body relative to the two distal portions;
one or more integrated circuits mounted onto the planar portion;
a plurality of leads extending from each integrated circuit, the plurality of leads configured to electrically connect to the printhead body; and
one or more arms attached to the planar portion and each arm including a main portion substantially perpendicular to the planar portion and a distal end substantially parallel to the top surface of the planar portion, wherein each distal end extends toward a center of the planar portion such that the distal end is positioned over the substantially planar portion and over the printhead body, each distal end including one or more external connectors configured to connect to the external circuit.
2. The circuit of claim 1 , further comprising:
a plurality of apertures, each aperture coated with a conductive material and configured to provide an electrical connection to the printhead body;
wherein each of the plurality of leads extends from an integrated circuit to connect to one of the plurality of apertures.
3. The circuit of claim 1 , where the planar portion includes at least one layer of copper and at least one layer of polyimide.
4. The circuit of claim 1 , where the central portion is comprised of a plurality of layers including at least one conductive layer and the distal portions are comprised of a plurality of layers, including at least one conductive layer, and where the number of layers comprising the central portion and the distal portions are not equal.
5. The circuit of claim 1 , wherein:
the central portion is comprised of a first layer of polyimide coated on either side with layers of copper, a second layer of polyimide coated on either side with layers of copper, and a layer of adhesive joining the first layer to the second layer; and
the two distal portions on either side of the central portion are each comprised of a layer of polyimide coated with a layer of copper.
6. The circuit of claim 1 , where the leads comprise traces of copper affixed to a top surface of the circuit, the top surface formed from polyimide.