Patent · US Expired

Circuit for supplying power to a dental photopolymerizing apparatus

US4839566A · kind A · utility

55Cited by

13References

7Claims

0Family size

Assignee

ESPE Stiftung & Co. Produktions-und Vertriebs KG · DE

Inventors

Wolf-Dietrich Herold · Hechendorf, DE
Karl L. Grafwallner · Munich, DE
Michael Keller · Washington, US

Key dates

Filing date	Feb 19, 1987
Grant date	Jun 13, 1989
Priority date	—
Expiry date	Feb 19, 2007

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S315/07
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

An electric lamp for the photopolymerization of dental materials is supplied with constant electric power so that constant light output is obtained. The control circuit used to this end operates with a triac (3) connected between an a.c. voltage supply (2) and the lamp (1), said triac being controlled by signal values stored in a read-only memory of a microprocessor (4). Said stored values are respectively allocated to pairs of instantaneous values of lamp current and lamp voltage, the instantaneous values being detected in each cycle of the a.c. supply voltage and being utilized to address the read-only memory.

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