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Displacement measurement method and displacement measurement device

A technology of displacement measurement and diffraction grating, applied in measurement devices, electrical devices, transportation and packaging, etc., can solve problems such as inability to detect correctly, regenerative braking and mechanical braking control can not be smoothly carried out, etc. simple effect

Inactive Publication Date: 2015-11-25
TAIYO YUDEN KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, although the above-mentioned mechanical brake operating point adjusted by the user is changed to P2, for example, it cannot be detected correctly, so there is a defect that the control between regenerative braking and mechanical braking cannot be performed smoothly.

Method used

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  • Displacement measurement method and displacement measurement device
  • Displacement measurement method and displacement measurement device
  • Displacement measurement method and displacement measurement device

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Embodiment 1

[0038] First, refer to figure 1 , Image 6 , Figure 7 ,as well as Figure 8 , to illustrate the basic structure of Embodiment 1 of the present invention. This embodiment is an example of applying the displacement measurement of the present invention to the measurement of the elongation and movement of the brake wire rope of an electric power-assisted bicycle. figure 1 is a schematic diagram showing the basic structure of this embodiment, Figure 7 is a diagram showing the overall configuration of an electric assist bicycle, Figure 8 It is a figure which shows the outline|summary of the brake mechanism of the said electric assist bicycle. like figure 1 As shown, the displacement measurement device 10 of the present invention includes: a laser light source 12 such as a laser diode; a collimator lens 14 that changes the laser light 13 from the laser light source 12 into straight parallel light 15; A first diffraction grating 16 , a second diffraction grating 18 , and...

Embodiment 2

[0101] Next, refer to Figure 14 and Figure 15 , to illustrate Embodiment 2 of the present invention. In addition, the same reference numerals are used for the same or corresponding constituent elements as those of the first embodiment described above. Figure 14 It is a figure which shows the modification of the wire rope elongation amount detection part of the said embodiment, Figure 14 (A) is a diagram showing the basic structure of the wire rope elongation detection part of the present embodiment, Figure 14 (B) is a diagram showing the configuration of the photodetection circuit. also, Figure 15 (A) and (B) are diagrams showing signal waveforms of the output A and the output B from the photodetection circuit, Figure 15 (C) is the signal waveform of the calculation result of the above-mentioned output A and output B. In this embodiment, a level difference is provided on the third diffraction grating side, and by dividing the output of the two-divided optical sens...

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Abstract

A technique for measuring displacement involves passing parallel laser light from a laser light source through a first diffraction grating to a semi-transparent semi-reflective mirror. A portion of the laser light is reflected as first reversed light, which passes through the first diffraction grating. The remainder of the parallel laser light proceeds to a total reflection mirror and is reflected as second reversed light that passes through the semi-transparent semi-reflective mirror and the first diffraction grating. The amount of refracted light of a predetermined order that is of the first and second reversed light and that results from the first diffraction grating is detected by a first optical sensor, and the amount of displacement is obtained from the interference band or a signal thereof corresponding to the amount of relative motion in the axial direction of the total reflection mirror with respect to the semi-transparent semi-reflective mirror.

Description

technical field [0001] The present invention relates to a displacement measurement method and a displacement measurement device utilizing optical interference, and more particularly, to expansion of a measurement range. Background technique [0002] In recent years, people who travel by car have become interested in bicycles with electric assist due to environmental protection and health concerns. Especially bicycles with electric power assist, bicycles that can travel farther on a single charge and can regenerate energy have attracted people's attention. Against such a background, in the case of regenerative charging during braking, it generally starts to respond after applying the brakes. However, it is inefficient to use regenerative charging only after applying the brakes. Therefore, it is suitable to use regenerative charging from the state before braking when the brake lever is pulled just before braking. Therefore, a device is required that detects the pre-braking s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/00B62M6/80F16D66/00G01B11/16
CPCG01B11/002B60L3/0076B60L7/12B60L7/24B60L11/007B60L2200/12B60T17/221B62K23/06B62M6/50B60L50/20G01B11/00F16D66/00G01B11/16
Inventor 小山胜弘池田正人
Owner TAIYO YUDEN KK