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Optical encoder

An optical and encoder technology, applied in the field of optical encoders, can solve problems such as difficulty in miniaturization

Active Publication Date: 2010-09-15
YASKAWA DENKI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to achieve miniaturization because the two detection parts are arranged at positions separated from each other.

Method used

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Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0059] (Structure of the first embodiment)

[0060] figure 1 It is a side view showing the optical encoder according to the first embodiment of the present invention, figure 2 is the floor plan. in, figure 2 The floor plan is viewed from the underside of the paper figure 1 And the obtained figure.

[0061] Such as figure 1 and figure 2 As shown, the optical encoder 1 of the present embodiment is roughly divided and includes: a rotating shaft 11 , a turntable 13 , an annular slit 25 , a light source 16 , a detection unit 12 , and a signal processing device 170 .

[0062] One end of the rotating shaft 11 is connected to a rotating body (not shown) whose rotation angle is to be measured, and the rotating shaft 11 rotates around a rotation center 100 in the longitudinal direction of the rotating shaft 11 as the rotating body rotates.

[0063] The turntable 13 is connected to the rotation shaft 11 and formed to be rotatable around the rotation center 100 as the rotation s...

no. 2 Embodiment approach

[0136] (Structure of the second embodiment)

[0137] Figure 15 It is a side view showing the optical encoder according to the second embodiment of the present invention.

[0138] The main difference from the first embodiment lies in the configuration of the reflective optical system to which the principle of three gratings is applied. In addition, since the signal processing part 17 of this embodiment can employ|adopt the same structure as the said 1st Embodiment or the 3rd Embodiment mentioned later, it is abbreviate|omitted for convenience of description.

[0139] In the optical encoder 2 of this embodiment, the light source 16 is arranged on the same surface side as the first light receiving element 22A and the second light receiving element 22B of the turntable 13, and the light source slit 40 is arranged on the optical path of the light source 16. , and instead of the first fixed slit 21A and the second fixed slit 21B, the first index slit 41A and the second index slit...

no. 3 Embodiment approach

[0168] (Structure of the third embodiment)

[0169] Figure 21 It is a side view showing an optical encoder according to a third embodiment of the present invention, Figure 22 is the floor plan. This embodiment can solve the above-mentioned problems. in, Figure 22 The floor plan is viewed from the underside of the paper Figure 21 And the obtained figure. Components that are the same as those of the encoder of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

[0170] Such as Figure 21 As shown, the optical encoder 3 of the present embodiment includes a third annular slit 25C and a third detection unit 12C in addition to the configuration of the encoder 1 of the first embodiment.

[0171] The third annular slit 25C has a plurality of concentric circular slit patterns similarly to the first annular slit 25A and the second annular slit 25B. On the other hand, the third annular slit 25C is formed such that the cente...

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Abstract

The present invention provides an optical encoder. The optical encoder includes a rotation disc arranged on a rotary shaft; a first annular slit arranged on the rotation disc and eccentric relative to a rotation center of the rotation shaft; a second annular slit arranged on the rotation disc and being eccentric in a different direction relative the first annular slit; a first detection part used to detect the displacement of the first annular slit; a second detection part used to detect the displacement of the second annular slit; and a signal processing device used to detect an absolute rotational angle of the rotation disc based on the detected signal output from the first and second detection parts.

Description

technical field [0001] The present invention relates to an optical encoder used as a positioning sensor for a rotating body such as a motor. Background technique [0002] Conventionally, there is an optical encoder in which a plurality of concentric circles eccentric with respect to the rotation center of the rotation shaft are formed on a turntable in order to detect the absolute angle of the rotation shaft of a rotating body with high resolution. The eccentricity of the concentric circular slits is detected, and the absolute angle of the turntable is detected based on the eccentricity (for example, refer to Japanese Patent Application No. 2007-223499 (Japanese Patent Application Laid-Open No. 2009-058243 )). That is, since the concentric circular slits are formed eccentrically with respect to the rotating shaft, when the concentric circular slits rotate around the rotating shaft, the distance from the rotating shaft to the detection position of the concentric circular slit...

Claims

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Application Information

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IPC IPC(8): G01D5/26G01D21/02
CPCG01D5/34792G01D5/3473G01D5/36G01D5/34794
Inventor 吉田康山口阳介铃木嚆二
Owner YASKAWA DENKI KK
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