Patent · US Active

Dynamic adjustable focus for LED writing bars using piezoelectric stacks

US9201335B2 · kind B2 · utility

2Cited by

1References

7Claims

0Family size

Assignee

Xerox Corporation · US

Inventors

Derek William Judd · Stevenage, GB
Brian Noel Reid · Carnduff, GB
Michael John Wilsher · Letchworth, GB

Key dates

Filing date	Nov 21, 2013
Grant date	Dec 1, 2015
Priority date	—
Expiry date	Dec 25, 2033

Classification

Technology area (CPC G)Physics
CPC primaryG03G15/04054
WIPO fieldOptics
WIPO sectorInstruments

Abstract

According to aspects of the embodiments, there is provided methods of dynamically focusing an LED print bar or printhead using piezoelectric stacks. The stack is mounted on either end of the LED bar to adjust the focus of the bar against the photoreceptor surface. The piezo level could be either controlled through active feedback of some description such as optical or electrical, or as a service or manufacturing input. With electronic control, focus adjustments can be made by the machine, and dynamically, if needed. In one embodiment, a flextensional cell structure is employed to amplify the movement of the piezo stack to move the LED bar in the order of >50 microns closer or away from the photoreceptor surface.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.