Patent · US Expired

Motorized instrument for the examination of human eyes

US5648833A · kind A · utility

5Cited by

2References

14Claims

0Family size

Assignee

Block Medizintechnik GmbH · DE

Inventors

Manfred Doms · Saalfeld, DE
Ulrich Fischer · Ditzingen, DE

Key dates

Filing date	Jul 13, 1995
Grant date	Jul 15, 1997
Priority date	—
Expiry date	Jul 13, 2015

Classification

Technology area (CPC H)Electricity
CPC primaryH02N2/0025
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A phoropter comprises two observation channels, in each of said observation channels a plurality of disk-shaped mounts, rotatably seated about at least one axis, for mounting optically effective members and drive means for rotating said mounts. The drive means are piezoelectric motors, each of which is, on the one hand, connected to a base and, on the other hand, provided with a driving end portion, preferably a driven member which executes a rotating motion. The driven member is, compared to the piezoelectric motor, of small design.

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