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Scale assembly for optical encoder having affixed optical reference markers

An optical marker, encoder technology, applied in the direction of instruments, conversion sensor output, measurement devices, etc., to achieve the effect of simple application and low cost

Inactive Publication Date: 2009-09-16
THE GSI GRP LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It should be noted that this approach is not fully customizable as the customer's choice of marking location is limited to the predetermined location selected by the dial manufacturer

Method used

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  • Scale assembly for optical encoder having affixed optical reference markers
  • Scale assembly for optical encoder having affixed optical reference markers
  • Scale assembly for optical encoder having affixed optical reference markers

Examples

Experimental program
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Embodiment Construction

[0022] figure 1 A linear optical position encoder consisting of a scale assembly 10 and a light source / detector assembly 13 is shown. Linear optical encoders are used in applications that require knowing the exact relative position between two objects undergoing relative linear motion. The dial assembly 10 is installed or fixed on one object, and the light source / detector assembly 13 is installed or fixed on the other object. As an example, the dial assembly 10 may be mounted to a relatively stationary frame along which a tool or other object moves during manufacturing or assembly. A light source / detector assembly 13 is mounted on the tool or other object. As known to those skilled in the art, the dial assembly 10 includes a dial pattern, such as a series of relatively finely spaced cross-distributed marks (ie, perpendicular to one of the long sides of the dial assembly 10 ). In operation, the dial pattern is irradiated with light from the light source / detector assembly 13 ...

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PUM

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Abstract

A flexible optical marker is applied to an optical scale substrate to make an optical scale assembly for an optical position encoder. The marker may be a limit marker, index marker, or other type of marker. The marker substrate may be a plastic film such as polyester, singulated from a 'recombine' roll created by a web process. The marker has a microstructured pattern on one surface that is covered with a reflective metal coating. The marker also has an adhesive layer and is affixed to the optical scale substrate by a process of aligning the marker to an edge of the scale and then applying pressure to the upper surface of the marker. The marker may be applied with a handle portion that is separated from the marker after the marker is affixed. The marker may be especially useful with a flexible scale substrate such as a metal tape substrate. By affixing the marker to the scale substrate as a separate step of making an encoder scale, various benefits such as reduced inventory, cost, and lead time may be achieved.

Description

technical field [0001] The invention relates to the field of optical position encoders, in particular to a scale assembly used for an optical encoder pasted with optical reference marks. Background technique [0002] In the field of optical position encoders (e.g. incremental optical position encoders), marking is affixed to or used in conjunction with an optical scale used to derive fine-grained position information approach is widely known. For example, the markings may include index markings that establish an encoder "home" or index position as a reference for all position measurements or indications. So-called "limit" flags have been used especially in linear encoders to provide an indication when the encoder has reached a propagation limit. Other types of markers have also been used. [0003] Alternative techniques also exist that use markers in combination with optical scales. In a typical approach, the markings are just a special feature of the optical scale itsel...

Claims

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Application Information

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IPC IPC(8): G01D5/347
CPCG01D5/34707G01D5/347G01D5/366G01D5/34746
Inventor 唐纳德·K·迈克尔唐纳德·L·格兰姆斯威廉·G·索伯恩斯图亚特·A·道德森二世基思·M·辛里奇斯安德鲁·高曼约耳·M·皮特森克利斯朵夫·C·瑞奇
Owner THE GSI GRP LLC