Absolute position measurement system and method of producing material measure for the same

• US 20070074416A1
• Filed: 09/07/2006
• Published: 04/05/2007
• Est. Priority Date: 09/30/2005
• Status: Abandoned Application

• Current Assignee: Bosch Rexroth Mechatronics GmbH (Robert Bosch GmbH)
• Original Assignee: Bosch Rexroth Mechatronics GmbH (Robert Bosch GmbH)
• Inventors: Reusing, Guenter
• Application Number:
  US11/516,936
• Publication Number:
  US 20070074416A1
• Time in Patent Office: Days
• US Class Current: 33/706
• CPC Class Codes: G01D 5/2455 with incremental and absolute tracks on the same encoder
• CPC Class Codes: G01D 5/2457 Incremental encoders having reference marks
• CPC Class Codes: G01D 5/2492 Pulse stream
• CPC Class Codes: G01D 5/2495 Pseudo-random code

Abstract

A position measurement system has a material measure provided with incremental and absolute markings, and a scanner movable relative to the markings, wherein the incremental markings are formed by periodically located recesses on the material measure, and the absolute marking are located between the recesses of the material measure.

Claims

1. A position measurement system, comprising a material measure provided with incremental and absolute markings;

a scanner movable relative to said markings, said incremental markings being formed by periodically located recesses on said material measure, said absolute marking being located between said recesses of said material measure.

2. A position measurement system as defined in claim 1, wherein said recesses are identical to one another and located in a row.

3. A position measurement system as defined in claim 2, wherein said recesses that are identical to one another are configured as rectangular recesses.

4. A position measurement system as defined in claim 1, wherein said markings and recesses are arranged so that one of said absolute markings is located between each recess.

5. A position measurement system as defined in claim 1, wherein said absolute marking carries binary information configured so that the information of a plurality of adjacent ones of said absolute markings together yield unambiguous absolute position information.

6. A position measurement system as defined in claim 1, wherein said incremental markings and said absolute markings are configured so that said incremental markings are scanned inductively and said absolute markings are scanned noninductively by the scanner.

7. A position measurement system as defined in claim 6, wherein said absolute markings and said scanner are configured so that said absolute markings are scanned noninductively in a fashion selected from the group consisting of magnetically and optically.

8. A position measurement system as defined in claim 6, wherein said scanner has two separate sensors which are configured for scanning said incremental markings and said absolute markings and located one after another in a measurement direction.

9. A method for producing a material measure of a position measurement system, comprising the steps of providing incremental and absolute markings in the material measure, which markings are scannable by a scanner movable relative to the markings;

forming the incremental markings by periodically located recesses on the material measure; and

locating the absolute markings between the recesses of the material measure.

10. A method as defined in claim 9;

and further comprising scanning the incremental markings during a production of the absolute markings.

11. A method as defined in claim 9;

and further comprising scanning the absolute markings during a production of the incremental markings.