Printhead drop detectors
AssigneeHewlett-Packard Development Company, L.P.
InventorsFrancisco Gomez, Jose Francisco Bravo de Vega, Jordi Bas
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Abstract
In some examples, a printhead drop detector comprises a plurality of drop detection units. Each drop detection unit may comprise a radiation source and radiation detector and may be to detect a drop passing through a sampling volume between the radiation source and the radiation detector. A radiation detector of a first drop detection unit and a radiation source of a second drop detection unit is arranged on a first side of the sampling volume; and a radiation source of the first drop detection unit and a radiation detector of the second drop detection unit is arranged on the second side of the sampling volume.
Claims15
A printhead drop detector comprising:
- a first drop detection unit including a first radiation source and a first radiation detector, wherein the first drop detection unit is to detect a drop passing therethrough;
- a second drop detection unit including a second radiation source and a second radiation detector, wherein the second drop detection unit is to detect the drop passing therethrough, and wherein the first radiation source, the second radiation source, the first radiation detector, and the second radiation detector define a sampling volume, wherein
- the first radiation detector and the second radiation source are arranged on a first side of the sampling volume;
- and
- the first radiation source and the second radiation detector are arranged on a second side of the sampling volume, wherein the second side is opposite the first side.
Print apparatus comprising:
- a printhead to selectively deliver a print material;
- and
- a drop detector to monitor the ejection of print material from the printhead and comprising a plurality of drop detection units, each drop detection unit comprising an emitter and a receiver and being to detect a drop passing though a sampling volume between the emitter and the receiver, wherein the units are arranged such that, on opposed sides of the sampling volume, emitters and receivers are provided alternately.
A drop detector for use with a printhead, the drop detector comprising a first row of a first plurality of alternating radiation emitters and radiation detectors and a second row of a second plurality of alternating radiation emitters and radiation detectors, wherein each emitter of the first row is to emit radiation to be received by a paired radiation detector of the second row, and each emitter is of the second row is to emit radiation to be received by a paired radiation detector of the first row.
Dependencies are inferred from the claim text.