Inkjet printhead with metal alloy shim attachment of printhead chips
An inkjet printhead includes: a manifold having a plurality of ink outlets defined in a manifold surface; a shim adhesively bonded to the manifold surface, the shim having apertures aligned with the ink outlets; at least one row of printhead chips adhesively bonded to the shim. The shim and the manifold are each comprised of an Invar metal alloy.
1. An inkjet printhead comprising:
a manifold having a plurality of ink outlets defined in a manifold surface;
first and second longitudinal shim portions adhesively bonded to the manifold surface, the first and second longitudinal shim portions having apertures aligned with the ink outlets; and
first and second rows of printhead chips adhesively bonded to respective first and second longitudinal shim portions; and
wherein:
the first and second longitudinal shim portions and the manifold are each comprised of an Invar metal alloy.
2. The inkjet printhead of claim 1 , wherein the first and second longitudinal shim portions have a thickness in the range of 100 to 1000 microns.
3. The inkjet printhead of claim 1 , wherein the first and second longitudinal shim portions are interconnected via a plurality of trusses.
4. The inkjet printhead of claim 1 , wherein the manifold is a monolithic structure having a length suitable for pagewide printing onto A3-sized media.
5. The inkjet printhead of claim 1 , wherein the manifold comprises a plurality of longitudinally-extending ink supply channels.
6. The inkjet printhead of claim 5 , wherein the ink supply channels are arranged in pairs, each pair delivering two colors of ink to a respective row of printhead chips via respective ink outlets.
7. The inkjet printhead of claim 6 comprising at least two pair of ink supply channels and at least two rows of printhead chips.
8. The inkjet printhead of claim 1 , wherein one row comprises a plurality of printhead chips butted together in a line.