Printhead having capped fluid passages
View Patent ↗A printhead is provided having a casing mounted on a molding to define a fluid reservoir and a first passage in fluid communication between the fluid reservoir, a wafer at least defining at least a part of a channel spaced from the first passage and at least a part of a second passage arranged to provide fluid communication between the first passage and channel, a plurality of ink ejection devices in fluid communication with the channel, and a metal cap portion which encloses the casing and molding.
1. A printhead comprising:
a casing mounted on a moulding to define a fluid reservoir and a first passage in fluid communication with the fluid reservoir;
a first wafer defining at least a part of a channel spaced from the first passage and at least a part of a second passage, the second passage providing fluid communication between the first passage and the channel;
a plurality of ink ejection devices in fluid communication with the channel; and
a metal cap portion which encloses the casing and moulding.
2. A printhead according to claim 1 , wherein the channel is of smaller width than the first passage.
3. A printhead according to claim 1 , further comprising a second wafer at least defining a third passage and a remaining part of the channel, the third passage being arranged to provide the fluid communication between the channel and the ink ejection devices.
4. A printhead according to claim 3 , wherein the channel extends along a face of the first wafer, the first and second wafers being joined at said face.
5. A printhead according to claim 1 , wherein the moulding further defines a remaining part of the second passage.
6. A printhead according to claim 5 , wherein the second passage opens at a face of the first wafer, the first wafer and the moulding being joined at said face.