Linear drive for machining of an optical workpiece

Patent metadata

Field	Value
Publication number	US-9895782-B2
Application number	US-201314376188-A
Country	US
Kind code	B2
Filing date	Feb 6, 2013
Priority date	Feb 6, 2012
Publication date	Feb 20, 2018
Grant date	Feb 20, 2018

Abstract

A linear drive and its use for machining an optical workpiece are proposed, the linear drive having a linear movable rotor, a linearly movable compensating body and an electrical compensating drive for movement of the compensating body opposite to the rotor and the rotor extending into the compensating drive and/or a first bearing arrangement mounting the rotor in a torsionally stiff manner and a second bearing arrangement pivotally mounting the rotor.

First claim

The invention claimed is:

1. A linear drive for machining of an optical workpiece by means of a tool, comprising
a linearly movable rotor which bears or forms a fixture for the tool, and
an electrical rotor linear drive for moving the rotor,
wherein the electrical rotor linear drive has a first bearing arrangement and an axially spaced second bearing arrangement for the rotor, the first bearing arrangement mounting the rotor in a manner preventing rotation thereof, but permitting axial movement, and the second bearing arrangement mounting the rotor in a manner permitting axial and twisting movements, and
wherein the first bearing arrangement mounts an at least essentially square cross section of the rotor in a region of two diametrically opposite corner regions.

2. The linear drive as claimed in claim 1 , wherein at least a coil of the electrical rotor linear drive is located between the bearing arrangements.

3. The linear drive as claimed in claim 1 , wherein the rotor has a rotor section and an axially connecting guide section that has a smaller diameter or cross section than the rotor section.

4. The linear drive as claimed in claim 3 , wherein the rotor section bears at least one of a coil of the rotor drive and the fixture for the tool.

5. The linear drive as claimed in claim 3 , wherein the rotor section has an at least essentially polygonal cross section.

6. The linear drive as claimed in claim 3 , wherein the guide section has at least one of an essentially round cross section and a cylindrical shape.

7. The linear drive as claimed in claim 1 , wherein the rotor is air-cushioned.

8. The linear drive as claimed in claim 1 , wherein the electrical rotor linear drive has a coil which is connected to the rotor, and a stationary magnet arrangement.

9. The linear drive as claimed in claim 8 , wherein the rotor extends into or through the magnet arrangement.

10. The linear drive as claimed in claim 1 , wherein the electrical rotor linear drive has a linearly moveable compensating body and an electrical compensating linear drive motor for movement of the compensating body in a direction opposite to the rotor.

11. A linear drive for machining of an optical workpiece by means of a tool, comprising
a linearly movable rotor which bears or forms a fixture for the tool, and
an electrical rotor linear drive for moving the rotor,
wherein the linear drive has a first bearing arrangement and an axially spaced second bearing arrangement for the rotor, the first bearing arrangement mounting the rotor in a manner preventing rotation thereof, but permitting axial movement, and the second bearing arrangement mounting the rotor in a manner permitting axial and twisting movements,
wherein the linear drive has a third bearing arrangement for axially moveable support of the compensating body,
wherein the compensating body is air-cushioned and

wherein the air-cushioned bearing elements of the third bearing arrangement are moveable together with the compensating body.

Assignees

• Schneider Gmbh & Co Kg

Inventors

• Schneider Gunter
• Boerner Ulf
• Hofmann Klaus

Classifications

• H02K41/035

  DC motors; Unipolar motors · CPC title

• B23Q5/34 Primary

  Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission · CPC title

• B24B13/06

  grinding of lenses, the tool or work being controlled by information-carrying means, e.g. patterns, punched tapes, magnetic tapes · CPC title

• B24B47/04

  by mechanical gearing only · CPC title

• B23Q11/0035

  by adding or adjusting a mass, e.g. counterweights · CPC title