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US-11981138-B2 · May 14, 2024 · US
Setting start voltage for driving actuating elements
US9399342B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9399342-B2 |
| Application number | US-201514850303-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 10, 2015 |
| Priority date | Sep 10, 2014 |
| Publication date | Jul 26, 2016 |
| Grant date | Jul 26, 2016 |
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Abstract
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A printhead provides actuation pulses for driving actuating elements from a common drive waveform via respective switching circuits, the waveform having a pre-charge ramp followed by a steeper slope. A start voltage of a leading edge of the actuation pulse is set by opening the switching circuit to decouple the common drive waveform from its actuating element part way along the pre-charge ramp. After the pre-charge ramp the actuating element is coupled again to the common drive waveform, so that the voltage across the actuating element follows the steeper slope to form the leading edge. Adjusting the timing of the decoupling adjusts the start voltage, enables trimming relative to other actuating elements. The gentle slope of the pre-charge ramp enables the precision of timing of switching to be more relaxed, so that trigger circuitry for controlling the switching circuit can be simpler, smaller, cheaper and thermally more efficient.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method of operating a printhead to provide actuation pulses for driving actuating elements for ejecting droplets from an actuator and having steps of: providing a common drive waveform for coupling to the actuating elements via respective switching circuits, the common drive waveform having a pre-charge ramp followed by a steeper slope, setting a start voltage of a leading edge of an actuation pulse according to a trim input by opening a first of t…
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Operations & Transport · mapped topic
- B41J2/04541Primary
Operations & Transport · mapped topic
Operations & Transport · mapped topic
Operations & Transport · mapped topic
Operations & Transport · mapped topic
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Frequently asked questions
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- What does patent US9399342B2 cover?
- A printhead provides actuation pulses for driving actuating elements from a common drive waveform via respective switching circuits, the waveform having a pre-charge ramp followed by a steeper slope. A start voltage of a leading edge of the actuation pulse is set by opening the switching circuit to decouple the common drive waveform from its actuating element part way along the pre-charge ramp.…
- Who is the assignee on this patent?
- Xaar Technology Ltd
- What technology area does this patent fall under?
- Primary CPC classification B41J2/04541. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Jul 26 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).