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Optical encoder

A technology of optical encoders and light sources, applied in the field of optical encoders, can solve the problems of incomplete INC patterns, lossy and accurate detection, etc.

Pending Publication Date: 2020-10-20
MITUTOYO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, when a single composite track composed of an INC track and an ABS track is used (such as in the absolute position measuring device described in Japanese Patent Laid-Open Publication No. H5-71984), the INC pattern may be with omitted scale marks Incomplete INC pattern
Therefore, accurate detection may be impaired compared to the case of using a conventional INC pattern

Method used

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no. 1 example

[0034] Reference below Figure 1 to Figure 5 A first embodiment of the present invention is described.

[0035] In each drawing, the long direction of the scale 2 of the optical encoder 1 is shown as the X direction, the short direction is shown as the Y direction, and the height direction is shown as the Z direction. The description below may be provided simply using the terms X-direction, Y-direction and Z-direction. figure 1 is a perspective view of the optical encoder 1 according to the first embodiment of the present invention.

[0036] Such as figure 1 As shown, the optical encoder 1 comprises a long scale 2 and a head 3 which faces the scale 2 and is displaced relative to the scale 2 along the X direction (measurement direction). The optical encoder 1 is a linear encoder used in a linear scale which is a measuring device not shown in the figure. Optical encoder 1 is provided inside the linear scale. The linear scale detects the position of the head 3 relative to th...

no. 2 example

[0059] Reference below Image 6 A second embodiment of the present invention is described. In the following description, those parts that have been described previously are assigned the same reference numerals, and descriptions thereof are omitted. Image 6 is a perspective view showing an optical encoder 1A according to a second embodiment of the present invention. The optical encoder 1A of the second embodiment has a basically similar configuration to the optical encoder 1 of the first embodiment, except that the optical encoder 1A includes a head portion 3A.

[0060] The head 3 of the optical encoder 1 of the first embodiment includes a light source 4 and an image capturer 5, and as figure 1 As shown, the light source 4 includes a first light source 41 and a second light source 42 . The head 3A of the optical encoder 1A of the second embodiment is different from the first embodiment in that the head 3A further includes a single light source 4A, and the light arriving via...

no. 3 example

[0065] Reference below Figure 7 A third embodiment of the present invention is described. In the following description, those parts that have been described previously are assigned the same reference numerals, and descriptions thereof are omitted. Figure 7 is a perspective view showing an optical encoder 1B according to a third embodiment of the present invention. The optical encoder 1B of the third embodiment has a basically similar configuration to the optical encoder 1A of the second embodiment except that the optical encoder 1B includes a head 3B.

[0066] The head 3A of the optical encoder 1A of the second embodiment includes a single light source 4A and a dispersion component 10, such as Image 6 shown. The head 3B of the optical encoder 1B of the third embodiment differs from the second embodiment in that the head 3B does not include the dispersion component 10, and in that the first image capturing section 51B of the image capture 5B and the second image capturin...

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Abstract

Scale pattern in a scale of an optical encoder includes a first scale mark that blocks a first light from being guided to an image capturer and guides a second light to the image capturer, and a second scale mark that guides the first light and the second light to the image capturer. Second scale mark is arranged in an ABS pattern and the first scale mark is arranged in an INC pattern by incorporating the second scale mark. Image capturer includes a first image capturing section that captures an image of the ABS pattern from the first light that arrives via the second scale mark, and a secondimage capturing section that captures an image of the INC pattern from the second light that arrives via the first scale mark and the second scale mark. Calculator calculates a position of a head relative to the scale.

Description

[0001] Cross References to Related Applications [0002] This application claims priority from Japanese Application No. 2019-071201 filed April 3, 2019, the disclosure of which is hereby expressly incorporated by reference in its entirety. technical field [0003] The invention relates to an optical encoder. Background technique [0004] Conventionally, there is known an optical encoder comprising a scale, a head having a scale pattern arranged along a measuring direction, a head facing the scale and being displaced relative to the scale along the measuring direction, and a calculator calculating A signal based on the relative displacement between the scale and the head. The head includes a light source that emits light at the scale and an image capturer that captures an image of light arriving from the light source via the scale pattern. [0005] In this example, as a method of detecting the relative displacement amount between the scale and the head, for an optical encod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/347
CPCG01D5/347G01D5/34792G01D5/34746G01D5/34715
Inventor 加藤庆显
Owner MITUTOYO CORP
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