Patent · US Expired

Binary piezoelectric drive for lens focusing system

US4342935A · kind A · utility

17Cited by

7References

8Claims

0Family size

Assignee

Discovision Associates · US

Inventors

Michael Kallmeyer · Eppelheim, DE
Hans Rosch · Aurora, US
Claus Scheuing · Lorch, DE
Bernhard Solf · Sindelfingen, DE

Key dates

Filing date	Apr 10, 1980
Grant date	Aug 3, 1982
Priority date	—
Expiry date	Apr 10, 2000

Classification

Technology area (CPC H)Electricity
CPC primaryH10N30/503
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

A deflection arrangement is described which comprises several piezocrystal elements which are separately driven by a positive or a negative voltage. In this configuration, there is no elastic hysteresis. The arrangement is particularly suitable for automatic focusing systems.

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