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Optical coder

An optical encoder and spectrum technology, applied in the field of optical encoders, can solve the problems of unfavorable cost, peeling off of bonded parts, etc., and achieve the effect of excellent resistance performance

Active Publication Date: 2004-10-27
FANUC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such an adhesive structure is disadvantageous in cost, and in addition, the bonded part may also come off

Method used

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Examples

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Embodiment Construction

[0022] figure 2 It is a schematic view to illustrate an embodiment of the structure of the optical encoder used in the present invention. like figure 2 As explained in, the optical encoder according to the present embodiment is a rotary encoder, which consists of an encoder disc 1, a rotating shaft 2, a fixed slit member 3, a light receiving unit 4, and a light emitting unit 5 as basic components. In the light emitting unit 5, one or more light emitting elements are provided, and if necessary, a lens and the like for parallelizing the light beams are provided. Here, an infrared light-emitting diode with an emission wavelength in the range of 800 to 1000 nm is used as the light-emitting element. A code disc 1 is provided with a code grating whose features will be described later. The encoder disc 1 mounted on the rotary shaft 2 is positioned such that its encoder grating can be constantly inserted between the light emitting unit 5 and the light receiving unit 4 .

[0023...

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Abstract

An optical encoder whose environmental resistance is improved by increasing the variety of options of materials for a resin-made code plate thereof. Used as material for at least a code pattern of the code plate of the optical encoder is one which meets the condition that the material has spectral transmittance of 70% or more with respect to detection light and that of 50% or less with respect to partial light (for example blue light) of visible wavelengths in translucent sections. If infrared light having wavelengths between 800 nm and 1000 nm is used as detection light, it is preferable to apply polyetherimide, polyethersulfone or polyphenylsulfone as a colored resin material. These materials are excellent in heat resistance, oil resistance, etc., compared to transparent and colorless materials (PMMA, PC, glass, etc.) which have been conventionally used, and hardly cause melting, deformation, white turbidity, etc., in a harsh environment.

Description

technical field [0001] The present invention relates to an optical encoder for use in combination with a rotating shaft such as a motor or the like, and more particularly to an optical encoder employing an encoder disk made of a resin material. Background technique [0002] Usually, a code disc made of transparent glass equipped with a grating made by chromium deposition and etching technology is used as a code disc for optical encoders requiring high precision. However, in recent years, due to improvements in molding and transferring technologies, it is very likely that colorless and transparent photoresins will be used instead of glass materials. The main reason for this is that, generally speaking, a resin material is excellent in mass production due to ease of molding, which has an advantage of low manufacturing cost, compared with glass. There are many different types of well-known constructions of transparent resin code discs. exist figure 1 An example of such a str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/347
CPCG01D5/34707
Inventor 今井圭介寺嶋洋也
Owner FANUC LTD
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