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Optical encoder with fixed slit including elastic structure

An encoder and optical technology, applied in the field of optical encoders, can solve the problems of misalignment of thermal expansion rate bonding surface, reduction of fixing effect, separation from the pedestal 210, etc.

Active Publication Date: 2018-01-23
FANUC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, since the fixing slit 200 and the pedestal 210 are often formed of different materials, there is a concern that the fixing slit 200 and the pedestal 210 may stick to each other due to the difference in their thermal expansion coefficients when the temperature changes. Misalignment of the interface, thus reducing the fixation effect
Depending on the situation, there is also a concern that the fixing slit 200 may come off the pedestal 210

Method used

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  • Optical encoder with fixed slit including elastic structure
  • Optical encoder with fixed slit including elastic structure
  • Optical encoder with fixed slit including elastic structure

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Embodiment Construction

[0031] Embodiments of the present invention will be described below with reference to the drawings. Scale scales are appropriately changed for the illustrated structural elements to facilitate understanding of the present invention.

[0032] Figure 12 It is a schematic perspective view showing a structural example of an optical encoder to which the present invention can be applied. The optical encoder 100 includes: a light emitting unit 102 that emits light; a fixed slit 104 and a rotating slit 106 that allow a part of the light emitted from the light emitting unit 102 to pass; 104 and rotating slit 106 for light.

[0033] The light emitting unit 102 functions as a light source that emits light to the fixed slit 104 and the rotating slit 106 as indicated by arrows. The light emitting unit 102 may be, for example, a light emitting diode (LED) or a laser diode (LD). In addition, the light emitting unit 102 may include a lens for converting light into parallel light. The li...

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PUM

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Abstract

Provided is an optical encoder having a fixed slit including an elastic structure portion, the optical encoder comprising: a light emitting portion that emits light; a fixed slit and a rotating slit through which a part of the light emitted from the light emitting portion passes; a portion that detects light passing through the fixed slit and the rotating slit; and a support that supports the fixed slit. The fixing slit includes: a pattern forming part formed with a plurality of slits through which light passes; a fixed part fixed to the support body; and an elastic structure part provided between the pattern forming part and the fixed part, Capable of elastic deformation. Thereby, a highly reliable fixing slit can be provided.

Description

technical field [0001] The present invention relates to an optical encoder provided with a fixed slit. Background technique [0002] Optical encoders are used to detect information related to the position, velocity, acceleration, etc. of a rotating body performing rotational motion. The information detected by the optical encoder is used, for example, to control a servo motor attached to a drive shaft of a machine tool. [0003] An optical encoder includes a fixed slit and a rotating slit through which a part of light emitted from a light source passes. A known example of an optical encoder is disclosed in Japanese JP-A-2005-274479. [0004] refer to Figure 13A with Figure 13B The structure of the fixed slit 200 in the related art will now be described. The fixing slit 200 has a plate-shaped body portion 204 formed of glass or metal. A pattern forming portion 202 in which a plurality of slits are formed in a predetermined pattern is provided at a central portion of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/32
CPCG01D5/34715G01D5/3473
Inventor 王苗苗尾高俊一谷口满幸
Owner FANUC LTD
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