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Position measuring device

A technology of measuring equipment and equipment, which is applied in the direction of measuring devices, instruments, and conversion sensor outputs, etc., and can solve problems such as high computing power and difficulties in realizing real-time processing

Active Publication Date: 2011-04-27
DR JOHANNES HEIDENHAIN GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The disadvantage here is that the Fourier analysis in turn leads to a periodic arrangement of the symbols
In addition, relatively high computing power is required and real-time processing is difficult to implement

Method used

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Embodiment Construction

[0023] figure 1 A position-measuring device configured according to the invention is shown schematically. According to the figure 1 , to illustrate the principle of the present invention, more specifically, for ease of understanding, first only the generation of a single analog sinusoidal periodic incremental signal IN from the serial code 1 is illustrated. The position-measuring device works according to the optical scanning principle, in which the code 1 is scanned by means of a light beam in the light transmission method. The scanning unit 10 is used for scanning the code 1 , and the scanning unit 10 is arranged to be movable relative to the code 1 in a measuring direction X for position measurement. Code 1 consists of a sequence of code elements C of length equal to width B arranged consecutively in the measurement direction X, where in figure 1 The symbols C are denoted by indices 1 to 8 in . Symbols C1, C4, C5, C6, C8 with the first characteristic and symbols C2, C3,...

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Abstract

The invention relates to a position measuring device, wherein, on the one hand, a code word (CW) defining the absolute position and, on the other hand, a periodic incremental signal (IN) are derived from a serial code (1). In order to generate an incremental signal (IN), an arrangement (11) is provided which converts the scanning signals (A1 to A8) in such a manner that the incremental signal (IN) is produced by adding up the converted scanning signals (TA1 to TA8). Advantageously, this conversion leads to the formation of a difference signal by comparison of the scanning signal (A1 to A8) to a reference signal and to a rectification of the difference signal.

Description

technical field [0001] The invention relates to a position-measuring device for measuring a position according to claim 1 and a method for position measurement according to claim 11 . Background technique [0002] In many fields, absolute position measuring devices are increasingly being used, in which absolute position information is derived from a code track with symbols arranged consecutively in the measuring direction. In this case, the symbols are arranged in a pseudo-random distribution, so that a certain number of successive symbols each form a bit pattern. In the case of moving the scanning device by a single symbol relative to the code track, a new bit pattern is already formed and provides a sequence of different bit patterns within the total measurement range to be detected in an absolute manner. [0003] Such sequential codes are called chain codes or pseudo-random codes. [0004] The resolution of the absolute position generated with absolute codes is insuffic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/245G01D5/249G01D5/347
CPCG01D5/2454G01D5/2495G01D5/34792G01D2205/85G01D5/34794
Inventor J·布拉希W·霍尔扎普费尔U·本纳R·伯恩哈德E·迈耶M·塞克特G·埃加特纳
Owner DR JOHANNES HEIDENHAIN GMBH