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Encoder device

A technology of encoders and optical encoders, applied in the direction of instruments, measuring instrument components, conversion sensor output, etc.

Active Publication Date: 2021-04-13
RENISHAW PLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Accordingly, the position and movement of the scale signal receiver 6 is constrained by the scale 4 except along the measurement dimension (along the x-axis in the illustrated embodiment)

Method used

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  • Encoder device
  • Encoder device
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Embodiment Construction

[0085] refer to Figure 2a to Figure 2d, there is a sealed encoder module 102 according to the invention. Sealed encoder module 102 includes a scale 104 having a number of features (not shown) and a readhead assembly 103 that includes a scale signal receiver 106 for receiving signals from the scale. In the depicted embodiment, sealed encoder module 102 is an optical encoder in which readhead assembly 103 utilizes electromagnetic radiation (EMR) in the infrared to ultraviolet range to read scale 104 . In particular, in this described embodiment the position measuring encoder device is an optical absolute encoder. Accordingly, the scale includes a continuous series of uniquely identifiable features (eg, a code) that can be read and processed by readhead assembly 103 to determine a unique position along the length of scale 104 . However, as will be appreciated, the position measuring encoder device is not necessarily an absolute encoder. For example, it may be an incremental o...

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Abstract

An encoder device includes a scale and a read head assembly including a scale signal receiver. the scale and the scale signal receiver are located within a protective housing configured to protect the scale and the scale signal receiver from contamination external to the protective housing and include a seal, the scale signal receiver A portion of the protective housing exterior is connectable through the seal. The arrangement of the scale signal receiver inside the protective housing is independent of the scale and the protective housing.

Description

technical field [0001] The invention relates to an encoder device. For example, what the present invention relates to is usually called a closed encoder, and is usually also called a sealed encoder. Background technique [0002] Encoders are used in many industries to provide position (or derivatives thereof, such as velocity and / or acceleration) feedback to a machine's control system, eg, feedback control of the position / motion of one part of a machine relative to another part of the machine. As will be appreciated, typically a scale is provided on one part of the machine, and a readhead for reading the scale is provided on another part of the machine, so that the relative positions of the scale and readhead, and thus of the machine parts, can be Detection is carried out along the encoder measurement dimension by the read head. [0003] The technology used by such encoders may require that the environment in which they are used be clean and free from contamination such as...

Claims

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Application Information

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IPC IPC(8): G01D5/347
CPCG01D5/34753G01D5/34761G01D11/245G01D5/34715G01D5/34776
Inventor 芬利·乔纳森·埃文斯詹姆斯·雷诺兹·亨肖史蒂芬·林德西·托克奈尔
Owner RENISHAW PLC
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