WO2022264735A1 - 受光素子及び回転検出器 - Google Patents
受光素子及び回転検出器 Download PDFInfo
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- WO2022264735A1 WO2022264735A1 PCT/JP2022/020502 JP2022020502W WO2022264735A1 WO 2022264735 A1 WO2022264735 A1 WO 2022264735A1 JP 2022020502 W JP2022020502 W JP 2022020502W WO 2022264735 A1 WO2022264735 A1 WO 2022264735A1
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- light
- light receiving
- receiving
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- receiving element
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- 238000001514 detection method Methods 0.000 claims abstract description 66
- 238000000926 separation method Methods 0.000 claims description 18
- 238000011000 absolute method Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 239000000470 constituent Substances 0.000 description 6
- 239000000758 substrate Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/347—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells using displacement encoding scales
- G01D5/34707—Scales; Discs, e.g. fixation, fabrication, compensation
- G01D5/34715—Scale reading or illumination devices
Definitions
- the present disclosure relates to light receiving elements and rotation detectors.
- a rotation detector in Japanese Patent Application Laid-Open No. 2002-200003 uses a light receiving element having an absolute detection section and an incremental detection section arranged on a circumference centered on the rotation axis.
- the present disclosure has been made to solve such problems, and aims to provide a light-receiving element capable of increasing the degree of freedom in designing an incremental light-receiving unit, and a rotation detector including the same.
- one aspect of the light receiving element is a plurality of first absolute light receiving units arranged on a first circumference having a first radius and outputting detection signals in an absolute manner; and a plurality of light-receiving unit groups that output detection signals in a manner.
- the plurality of light-receiving part groups are selectively arranged in an area having a radius larger than the first circumference, and are concentric with the first circumference and having a second radius larger than the first radius.
- the plurality of first absolute light-receiving portions and the plurality of light-receiving portion groups arranged on a circumference do not overlap.
- One aspect of the rotation detector according to the present disclosure includes the light-receiving element and a rotating plate that is irradiated with light and rotates about a rotating shaft, and the light is transmitted to the light-receiving element via the rotating plate. be irradiated.
- FIG. 1 is a cross-sectional view showing the configuration of an electric motor provided with a rotation detector according to an embodiment.
- FIG. 2 is a plan view of a rotating plate included in the rotation detector according to the embodiment.
- FIG. 3 is an enlarged view of a part of the pattern portion of the rotating plate included in the rotation detector according to the embodiment.
- FIG. 4 is a plan view of the light receiving element according to the embodiment.
- FIG. 5 is a plan view showing the configuration of a light receiving section group included in the light receiving element according to the embodiment.
- FIG. 6 is a diagram showing a state in which the first main body portion and the first separating portion of the first light receiving portion included in the light receiving element according to the embodiment are arranged on the same circumference.
- FIG. 1 is a cross-sectional view showing the configuration of an electric motor provided with a rotation detector according to an embodiment.
- FIG. 2 is a plan view of a rotating plate included in the rotation detector according to the embodiment.
- FIG. 3 is an enlarged view
- FIG. 7 is a schematic cross-sectional view showing the positional relationship between the light-emitting portion of the light-receiving element, the light-receiving element, and the rotating plate according to the embodiment.
- FIG. 8 is a schematic cross-sectional view showing the positional relationship between the light-emitting portion of the light-receiving element, the light-receiving element, and the rotating plate according to the comparative example.
- each figure is a schematic diagram and is not necessarily strictly illustrated. Also, in each figure, the same reference numerals are assigned to substantially the same components as those in other figures, and duplicate descriptions will be omitted or simplified.
- FIG. 1 is a cross-sectional view showing the configuration of an electric motor 1 including a rotation detector 10 according to this embodiment.
- a cross section passing through the rotation axis A of the electric motor 1 is shown.
- the electric motor 1 mainly includes a motor frame 2, a stator 3, a rotor 4, a rotating shaft 5, bearings 7, and a rotation detector 10.
- the motor frame 2 is a housing that houses the stator 3, the rotor 4, and the like.
- a stator 3 is fixed to the inner surface of the motor frame 2 .
- the rotor 4 is provided on the motor frame 2 via bearings 7 so as to be rotatable with respect to the stator 3 .
- the rotating shaft 5 is a rod-shaped member fixed to the inner surface of the rotor 4 and rotates around the rotation axis A.
- the rotary shaft 5 is rotatably fixed to the motor frame 2 via bearings 7 .
- a rotation detector 10 is provided at one axial end of the rotating shaft 5 .
- a load such as a blade, a gear, or a wheel, which is rotationally driven by the rotation of the rotating shaft 5, is attached to the other end of the rotating shaft 5 in the axial direction.
- the rotating shaft 5 is made of magnetic metal such as iron.
- the bearing 7 is a member that is fixed to the motor frame 2 and supports the rotating shaft 5 rotatably with respect to the motor frame 2 .
- the bearing 7 is arranged near one end of the rotating shaft 5 in FIG. 1 , a bearing may also be arranged near the other end of the rotating shaft 5 .
- the rotation detector 10 detects the rotation of the detection target. Specifically, the rotation detector 10 detects the position (rotational position) of the detection target, the rotation direction of the detection target, the rotation speed of the detection target, and the like.
- the object to be detected is the rotating shaft 5 . That is, the rotation detector 10 detects the position of the rotating shaft 5, the rotating direction of the rotating shaft 5, the rotation speed of the rotating shaft 5, and the like.
- the rotation detector 10 is provided at one end of the rotating shaft 5 as described above.
- the rotation detector 10 includes a light receiving element 20 , a light emitting section 14 and a rotating plate 40 .
- rotation detector 10 further includes substrate 12 , frame 6 , bosses 8 , bolts 9 and screws 13 .
- the frame 6 is a cylindrical member attached to the motor frame 2 so as to cover one axial end of the rotating shaft 5, the rotating plate 40, and the like.
- the frame 6 is fixed to the motor frame 2 together with the board 12 by screws 13 .
- the rotating plate 40 is a plate that is fixed to the rotating shaft 5 via the boss 8 and rotates about the rotation axis A, and has a main body 42 and a pattern portion 50 .
- the main body 42 has a plate-like shape whose thickness direction is the direction along the rotation axis A. As shown in FIG. Further, the main body 42 has an annular shape when viewed in a direction along the rotation axis A. As shown in FIG. The main body 42 is attached to one axial end of the rotating shaft 5 and rotates about the rotating axis A together with the rotating shaft 5 . The axis of the main body 42 and the rotation axis A are aligned.
- the pattern section 50 is an optical modulation section arranged on the path of light propagating from the light emitting section 14 to the light receiving element 20 (that is, the optical path).
- the pattern portion 50 is arranged between the edge of the main body 42 and the rotation axis A and at a position facing the light emitting portion 14 and the light receiving element 20 .
- a light modulation pattern is formed on the circumference of the pattern portion 50 with the rotation axis A as the center.
- the pattern portion 50 is formed with a predetermined pattern of portions having a high reflectance and portions having a low reflectance with respect to the light from the light emitting portion 14 .
- the rotating plate 40 is made of, for example, stainless steel, and a low-reflectance coating is formed on the low-reflectance portion of the pattern section 50 . A detailed configuration of the pattern unit 50 will be described later.
- the boss 8 is a member to which the rotating plate 40 is fixed.
- a through hole is formed in the central portion of the boss 8 .
- the boss 8 is fixed to the rotating shaft 5 by a bolt 9 inserted into the through hole, and rotates together with the rotating shaft 5 about the rotation axis A. As shown in FIG.
- the bolt 9 is a member that fixes the boss 8 to the rotating shaft 5.
- the bolt 9 is a hexagon socket bolt.
- the substrate 12 is a plate-like member arranged at a position facing the rotating plate 40 and separated from the rotating plate 40 .
- the light receiving element 20 and the light emitting section 14 are arranged on the main surface of the substrate 12 facing the rotating plate 40 .
- the substrate 12 is fixed to the motor frame 2 via the frame 6 by screws 13 .
- the light emitting unit 14 is a light source that emits light.
- the light emitting portion 14 is arranged at a position facing the pattern portion 50 of the rotating plate 40 .
- the configuration of the light emitting unit 14 is not particularly limited as long as it can emit light.
- the light-emitting part 14 is a light-emitting diode and is arranged on the substrate 12 . More specifically, the light emitting section 14 is arranged on the light receiving element 20 arranged on the substrate 12 .
- the light emitting section 14 may be included in the light receiving element 20 . That is, the light receiving element 20 may include the light emitting section 14 .
- the light receiving element 20 is an element that receives light from the light emitting section 14 .
- the light from the light emitting section 14 is applied to the light receiving element 20 through the rotating plate 40 .
- the light from the light emitting section 14 is reflected by the pattern section 50 of the rotary plate 40 and is irradiated onto the light receiving element 20 .
- a detailed configuration of the light receiving element 20 will be described later.
- FIG. 2 is a plan view of rotating plate 40 included in rotation detector 10 according to the present embodiment.
- FIG. 2 is a plan view of the surface of the rotary plate 40 facing the light receiving element 20 as viewed from the direction along the rotation axis A.
- FIG. 3 is an enlarged view of part of the pattern portion 50 of the rotating plate 40 included in the rotation detector 10 according to the present embodiment.
- 3 is an enlarged view of the inside of the dashed frame III shown in FIG. 2.
- the pattern portion 50 is arranged on the surface of the rotary plate 40 facing the light receiving element 20 .
- the pattern portion 50 is arranged on a circle around the rotation axis A.
- the pattern portion 50 has a first pattern portion 51 , a second pattern portion 52 , a third pattern portion 53 and a fourth pattern portion 54 .
- the first pattern portion 51 , the second pattern portion 52 , the third pattern portion 53 and the fourth pattern portion 54 are arranged in this order from the edge side of the rotary plate 40 .
- the first pattern portion 51 includes a plurality of low reflection areas 51a.
- the plurality of low-reflection areas 51a are formed of, for example, a film having a low reflectance with respect to the light from the light-emitting section 14. As shown in FIG. A plurality of low reflection areas 51a form an incremental pattern.
- the plurality of low-reflection regions 51a have the same rectangular (or fan-shaped) shape, and are arranged at equal intervals on a circumference around the rotation axis A. As shown in FIG.
- the number of low reflection regions 51a is not particularly limited, but is 512 in the present embodiment.
- the second pattern portion 52 includes a plurality of low reflection areas 52a.
- the plurality of low-reflection areas 52a are formed of, for example, a film having a low reflectance with respect to the light from the light-emitting section 14. As shown in FIG. A plurality of low reflection areas 52a form an absolute pattern. In the present embodiment, the plurality of low-reflection areas 52a are randomly arranged on the circumference centered on the rotation axis A on the rotor plate 40. As shown in FIG.
- the light-receiving element 20 receives light from the light-emitting section 14 modulated by the plurality of low-reflection regions 52a, thereby identifying the absolute position of the rotating plate 40 in the circumferential direction about the rotation axis A.
- the third pattern portion 53 includes a plurality of low reflection areas 53a.
- the plurality of low-reflection areas 53a are formed of, for example, a film having a low reflectance with respect to the light from the light-emitting section 14. As shown in FIG. A plurality of low reflection areas 53a form an absolute pattern.
- the plurality of low-reflection regions 53a are randomly arranged on the circumference centered on the rotation axis A on the rotating plate 40, similarly to the plurality of low-reflection regions 52a of the second pattern portion 52. be.
- the fourth pattern portion 54 includes a plurality of low reflection areas 54a.
- the plurality of low-reflection areas 54a are formed of, for example, a film having a low reflectance with respect to the light from the light-emitting section 14. As shown in FIG.
- the fourth pattern portion 54 is used to detect the number of rotations of the rotating plate 40 .
- the plurality of low reflection areas 54a have an arcuate shape extending in the circumferential direction about the rotation axis A on the rotor plate 40. As shown in FIG.
- Each of the plurality of low reflection regions 54a has an arcuate shape with a central angle of 180 degrees.
- the number of the plurality of low-reflection regions 54a is not particularly limited, in the present embodiment, there are four low-reflection regions 54a having arcuate shapes with mutually different radii.
- the four low-reflection regions 54a are arranged at positions different by 90 degrees with the rotation axis A as the center.
- FIG. 4 is a plan view of light receiving element 20 according to this embodiment.
- FIG. 4 is a plan view of the surface of the light receiving element 20 facing the rotary plate 40 as viewed in the direction along the rotation axis A. As shown in FIG.
- the light-receiving element 20 is an element having a plurality of light-receiving portions, each of which is an area for detecting light.
- the light receiving element 20 is, for example, a plate-shaped element having a semiconductor layer.
- Each of the plurality of light receiving portions of the light receiving element 20 is formed, for example, by adding an impurity to a semiconductor layer.
- the light receiving element 20 includes incremental detection units 21 a and 21 b and a first absolute detection unit 23 .
- the light receiving element 20 further includes a second absolute detection section 22 and a rotational speed detection section 24 .
- the increment detection units 21a and 21b are light detection units that output detection signals in an incrementing manner. Light from the light emitting unit 14 is mainly applied to the increment detecting units 21 a and 21 b through the first pattern portion 51 of the rotating plate 40 .
- Each of the increment detection units 21a and 21b includes a plurality of light receiving unit groups 21g arranged in a predetermined array direction at a predetermined array pitch P0.
- the plurality of light receiving portion groups 21g included in the increment detecting portion 21a are arranged on a circle around the rotation axis A. As shown in FIG.
- a plurality of light-receiving unit groups 21g included in the increment detection unit 21b are arranged on a circle centered on the rotation axis A and positioned on the inner diameter side (that is, the side closer to the rotation axis A) with respect to the increment detection unit 21a. .
- the increment detection section 21a is arranged on the outer diameter side with respect to the increment detection section 21b.
- the increment detector 21a is an example of a first increment detector
- the increment detector 21b is an example of a second increment detector.
- the light receiving element 20 since the light receiving element 20 according to the present embodiment has two increment detection units 21a and 21b, the redundancy of the increment signal can be ensured. Therefore, it is possible to obtain an increment signal that is highly resistant to positional deviation and the like.
- the first absolute detection section 23 is a detection section that outputs a detection signal in an absolute manner.
- the first absolute detection section 23 is irradiated with light from the light emitting section 14 mainly through the third pattern section 53 of the rotary plate 40 .
- the first absolute detector 23 has a plurality of first absolute light receivers 23a.
- the plurality of first absolute light-receiving portions 23a are arranged on a first circle having a first radius centered on the rotation axis A. As shown in FIG.
- the plurality of light-receiving portion groups 21g described above rotate toward the outer diameter side (that is, with respect to the plurality of first absolute light-receiving portions 23a) among the inner diameter side and the outer diameter side with respect to the plurality of first absolute light-receiving portions 23a. only on the side far from the axis A).
- the plurality of light receiving portion groups 21g are concentric with the first circumference of the first radius on which the plurality of first absolute light receiving portions 23a are arranged, and on the second circumference of the second radius larger than the first circumference. arrayed.
- the plurality of first absolute light receiving portions 23a and the plurality of light receiving portion groups 21g do not overlap.
- the increment detection units 21a and 21b are arranged on the outer diameter side of the first absolute detection unit 23, it is possible to suppress the circumferential dimension of the increment detection units 21a and 21b from being reduced. Thereby, the degree of freedom in designing the plurality of light receiving unit groups 21g included in the increment detecting units 21a and 21b can be increased. Therefore, the distortion of the detection signals from the increment detection units 21a and 21b can be reduced.
- the second absolute detection section 22 is a detection section that outputs a detection signal in an absolute manner.
- the second absolute detection section 22 is irradiated with light from the light emitting section 14 mainly through the second pattern section 52 of the rotating plate 40 .
- the second absolute detector 22 has a plurality of second absolute light receivers 22a.
- the plurality of second absolute light receiving portions 22a are arranged on a fourth circumference that is concentric with the first circumference and has a fourth radius that is larger than the first radius and smaller than the second radius.
- the plurality of second absolute light-receiving portions 22a, the plurality of light-receiving portion groups 21g and the plurality of first absolute light-receiving portions 23a do not overlap.
- the rotation speed detection unit 24 is a detection unit that outputs a detection signal corresponding to the rotation speed of the rotating plate 40 . Light emitted from the light emitting unit 14 is applied to the rotational speed detection unit 24 mainly through the fourth pattern portion 54 of the rotating plate 40 .
- the rotational speed detector 24 has one or more arcuate light receivers 24a.
- the arcuate light-receiving portion 24a is concentric with the first circumference (that is, centered on the rotation axis A) and arranged on a third circumference with a third radius smaller than the first radius.
- the one or more arcuate light receiving portions 24a have a width in the direction of the third circumference larger than the width in the direction of the first circumference in each of the plurality of first absolute light receiving portions 23a.
- the rotational speed detector 24 has four arcuate light receivers 24a with different radii. The four arcuate light receiving portions 24a do not overlap the first absolute light receiving portion 23a.
- the rotation speed detection part 24 is arranged on the innermost side among the detection parts, so the dimension in the circumferential direction is limited. However, as described above, since the width of the arc-shaped light receiving portion 24a of the rotation speed detection portion 24 can be made larger than the width of the first absolute light receiving portion 23a, sufficient light can be received to detect the rotation speed.
- the light emitting section 14 is arranged on the light receiving element 20 .
- the light emitting section 14 is arranged between the first absolute detection section 23 and the second absolute detection section 22 .
- the intensity of the light received by the first absolute detection unit 23 and the second absolute detection unit 22 can be increased. can do. Therefore, the detection accuracy of the first absolute detection section 23 and the second absolute detection section 22 can be improved.
- FIG. 5 is a plan view showing the configuration of the light receiving portion group 21g according to this embodiment.
- the light receiving portion group 21g includes the first light receiving portion 211 and the second light receiving portion 211 arranged at a position shifted in the arrangement direction by 1/4 of the arrangement pitch P0 with respect to the first light receiving portion 211. and a light receiving unit 212 .
- the light receiving portion group 21g further includes a third light receiving portion 213 and a fourth light receiving portion 214. As shown in FIG.
- the third light receiving section 213 is shifted in the arrangement direction by 1/2 of the arrangement pitch P0 with respect to the first light receiving section 211, and is shifted in the arrangement direction by 1/4 of the arrangement pitch P0 with respect to the second light receiving section 212. Placed in a shifted position.
- the fourth light receiving section 214 is shifted in the arrangement direction by 3/4 of the arrangement pitch P0 with respect to the first light receiving section 211, and is shifted in the arrangement direction by 1/4 of the arrangement pitch P0 with respect to the third light receiving section 213. Placed in a shifted position.
- the light-receiving portion group 21 g is irradiated mainly with the light from the light-emitting portion 14 via the first pattern portion 51 of the rotating plate 40 .
- the light from the light emitting section 14 is periodically intensity-modulated by the first pattern section 51 when the rotary plate 40 rotates. For this reason, the intensity of the light with which the light receiving portion group 21g is irradiated periodically fluctuates.
- the phases of the intensity modulation of the light irradiated to the second light receiving portion 212, the third light receiving portion 213, and the fourth light receiving portion 214 are each 90 degrees from the phase of the intensity modulation of the light irradiated to the first light receiving portion 211. , 180 degrees and 270 degrees.
- the first light receiving section 211 is separated into a first main body section 211a and a first separation section 211b, the width of which in the arrangement direction D1 is less than 1/4 of the arrangement pitch P0.
- the first main body portion 211a and the first separation portion 211b are arranged apart from each other in a vertical direction D2 perpendicular to the arrangement direction D1.
- the arrangement direction D1 is a direction along the circumference centered on the rotation axis A and passing through the plurality of light receiving unit groups 21g.
- the vertical direction D2 is the radial direction of a circle centered on the rotation axis A. As shown in FIG.
- the second light receiving portion 212 is separated into a second main body portion 212a and a second separation portion 212b, the width of which in the arrangement direction D1 is less than 1/4 of the arrangement pitch P0, and the second main body portion 212a and the second separation portion 212b are spaced apart in the vertical direction D2.
- the third light receiving portion 213 is separated into a third main body portion 213a and a third separation portion 213b, the width of which in the arrangement direction D1 is less than 1/4 of the arrangement pitch P0, and the third main body portion 213a and the third separation portion 213b are spaced apart in the vertical direction D2.
- the fourth light receiving portion 214 is separated into a fourth main body portion 214a and a fourth separation portion 214b, the width of which in the arrangement direction D1 is less than 1/4 of the arrangement pitch P0, and the fourth main body portion 214a and the fourth separation portion 214b are spaced apart in the vertical direction D2.
- FIG. 6 is a diagram showing a state in which the first main body portion 211a and the first separating portion 211b of the first light receiving portion 211 according to the present embodiment are arranged on the same circumference.
- the first light receiving portion 211 has the first main phase portion 211m and a first sub-phase portion 211s.
- the first main phase portion 211m has a width of 1 ⁇ 3 of the arrangement pitch P0 in the arrangement direction D1.
- the first sub phase portion 211s has a width of 1 ⁇ 3 of the arrangement pitch P0 in the arrangement direction D1.
- the first sub phase portion 211s is located at a position shifted in the arrangement direction D1 by 1/12 of the arrangement pitch P0 with respect to the first main phase portion 211m, and is adjacent to the first main phase portion 211m in the vertical direction D2. It is placed in the position where
- the first main phase portion 211m of the first light receiving portion 211 has a width of 1 ⁇ 3 of the arrangement pitch P0 in the arrangement direction D1, when the rotating plate 40 rotates, the first main phase portion 211m has a trapezoidal wave-like period. output a typical signal. Similarly, the first sub-phase portion 211s also outputs a trapezoidal periodic signal. Further, since the first sub phase portion 211s is arranged at a position shifted in the arrangement direction D1 by 1/12 of the arrangement pitch P0 with respect to the first main phase portion 211m, the first sub phase portion 211s outputs The output signal is phase-shifted by 30 degrees (that is, 360 degrees/12) with respect to the signal output by the first main phase section 211m.
- the signal output by the first light receiving section 211 is the sum of the signal output by the first main phase section 211m and the signal output by the first sub phase section 211s. Therefore, the waveform of the signal output by the first light receiving section 211 is a waveform obtained by combining two trapezoidal waves, and is closer to a sine wave than a trapezoidal wave, that is, a waveform with less distortion.
- the second light receiving portion 212 also has a second main phase portion and a second sub and a phase portion.
- the second main phase portion has a width of 1/3 of the arrangement pitch P0 in the arrangement direction D1.
- the second sub-phase portion has a width of 1 ⁇ 3 of the arrangement pitch P0 in the arrangement direction D1.
- the second sub phase portion is located at a position shifted in the arrangement direction D1 by 1/12 of the arrangement pitch P0 with respect to the second main phase portion and adjacent to the second main phase portion in the vertical direction D2. placed.
- the third light receiving section 213 also has a third main phase section and a third sub phase section.
- the fourth light receiving section 214 similarly has a fourth main phase section and a fourth sub phase section.
- each of the plurality of light receiving unit groups 21g can suppress distortion of the output signal. Therefore, the light receiving element 20 can detect the position of the rotating plate 40 in the rotational direction with higher accuracy.
- the first main body portion 211a and the first separation portion 211b of the first light receiving portion 211 are integrated as shown in FIG.
- the second light receiving unit 212 in order for the second light receiving unit 212 to output a signal whose phase is shifted by 90 degrees with respect to the signal output by the first light receiving unit 211, the second light receiving unit 212 must be shifted in the arrangement direction D1 by 5/4 of the arrangement pitch P0. For this reason, there is a wasted space between the first light-receiving part 211 and the second light-receiving part 212 over a length of 11/12 of the arrangement pitch P0 where no light-receiving part is arranged.
- the first light-receiving portion 211 has a width in the arrangement direction D1 of less than 1/4 of the arrangement pitch P0.
- the first body portion 211a and the first separation portion 211b are separated from each other in the vertical direction D2.
- the second light receiving portion 212 is separated into a second main body portion 212a and a second separation portion 212b, the width of which in the arrangement direction D1 is less than 1/4 of the arrangement pitch P0.
- the two-separation part 212b is spaced apart in the vertical direction D2.
- the second main body portion 212a can be arranged at a position shifted from the position of the first main body portion 211a by 1/4 of the arrangement pitch P0 in the arrangement direction D1.
- the second separating portion 212b can be arranged at a position shifted from the position of the first separating portion 211b by 1/4 of the arrangement pitch P0 in the arrangement direction D1.
- the first main body portion 211a and the second main body portion 212a are arranged in the arrangement direction D1, and the gap between the first main body portion 211a and the second main body portion 212a is less than 1/4 of the arrangement pitch P0.
- first separating portion 211b and the second separating portion 212b are arranged in the arrangement direction D1, and the gap between the first separating portion 211b and the second separating portion 212b is less than 1/4 of the arrangement pitch P0. be. Therefore, useless space between the first light receiving section 211 and the second light receiving section 212 can be reduced.
- the third light receiving section 213 and the fourth light receiving section 214 also have the same configuration as the first light receiving section 211 and the second light receiving section 212 . Therefore, the third light receiving section 213 and the fourth light receiving section 214 also have the same effect as the first light receiving section 211 and the second light receiving section 212.
- FIG. 7 is a schematic cross-sectional view showing the positional relationship between the light emitting portion 14 of the light receiving element 20, the light receiving element 20, and the rotating plate 40 according to this embodiment.
- FIG. 8 is a schematic cross-sectional view showing the positional relationship between the light emitting portion 14 of the light receiving element 920, the light receiving element 920, and the rotating plate 40 according to the comparative example. 7 and 8 are sectional views seen from a direction perpendicular to the rotation axis A.
- FIG. 7 and 8 are sectional views seen from a direction perpendicular to the rotation axis A.
- the light emitting section 14 has a light emitting surface 14s for emitting light.
- Each of the plurality of first absolute light receiving portions 23a has a light receiving surface 23s for receiving light, and the light emitting surface 14s is arranged on the same plane as the light receiving surface 23s.
- the arc-shaped light receiving portion 24a has a light receiving surface 24s, and the light emitting surface 14s is arranged on the same plane as the light receiving surface 24s.
- the main surface 20a of the light receiving element 20 facing the rotating plate 40, the light emitting surface 14s, the light receiving surface 23s, and the light receiving surface 24s are arranged on the same plane.
- the light receiving surfaces of the plurality of second absolute light receiving portions 22a and the plurality of light receiving portion groups 21g are also arranged on the same plane as the main surface 20a.
- the light emitting surface 14s of the light emitting section 14 according to the comparative example is not arranged on the same plane as the light receiving surfaces 23s and 24s. That is, the light emitting surface 14s is arranged at a position protruding from the main surface 920a of the light receiving element 920. As shown in FIG.
- the distance between the light receiving element 20 and the rotating plate 40 can vary, as shown in FIG.
- the light emitting surface 14s is not arranged on the same plane as the light receiving surfaces 23s and 24s. , the positions at which the light from the light emitting section 14 is incident on each of the light receiving surfaces 23s and 24s fluctuate. Therefore, the phase of the detection signal from each light receiving section fluctuates. Therefore, the detection accuracy of the rotation detector is lowered.
- the light-emitting surface 14s is arranged on the same plane as the light-receiving surfaces 23s and 24s.
- the incident position on each of the surfaces 23s and 24s does not change. Therefore, the light-receiving element 20 according to the present embodiment can output a highly accurate detection signal even when the distance between the light-receiving element 20 and the rotating plate 40 varies.
- the rotating plate 40 has a pattern portion that reflects part of the light from the light emitting portion 14, but the configuration of the pattern portion is not limited to this.
- the pattern portion may be a slit or the like that transmits part of the light from the light emitting portion 14 .
- a rotating plate is arranged between the light emitting section 14 and the light receiving section.
- the technology of the present disclosure can be used for a rotation detector that detects the amount of rotation of an electric motor or the like.
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Abstract
Description
実施の形態に係る受光素子及び回転検出器について説明する。
まず、本実施の形態に係る受光素子及び回転検出器の全体の構成について、図1を用いて説明する。
本実施の形態に係る回転検出器10が備える回転板40のパターン部50の詳細構成について図2及び図3を用いて説明する。図2は、本実施の形態に係る回転検出器10が備える回転板40の平面図である。図2は、回転板40の受光素子20と対向する面を回転軸線Aに沿った方向から見た平面図である。図3は、本実施の形態に係る回転検出器10が備える回転板40のパターン部50の一部を拡大した図である。図3は、図2に示される破線枠IIIの内部の拡大図である。
受光素子20の構成について、図4を用いて説明する。図4は、本実施の形態に係る受光素子20の平面図である。図4は、受光素子20の回転板40と対向する面を回転軸線Aに沿った方向から見た平面図である。
受光素子20の複数の受光部グループ21gについて、図5を用いて説明する。図5は、本実施の形態に係る受光部グループ21gの構成を示す平面図である。
次に、発光部14の構成について図7及び図8を用いて、比較例と比較しながら説明する。図7は、本実施の形態に係る受光素子20の発光部14と、受光素子20及び回転板40との位置関係を示す模式的な断面図である。図8は、比較例に係る受光素子920の発光部14と、受光素子920及び回転板40との位置関係を示す模式的な断面図である。図7及び図8は、回転軸線Aに垂直な方向から見た断面図である。
以上、本開示に係る受光素子及び回転検出器について、実施の形態に基づいて説明したが、本開示は、上記実施の形態に限定されるものではない。
2 モータフレーム
3 固定子
4 回転子
5 回転軸
6 フレーム
7 軸受け
8 ボス
9 ボルト
10 回転検出器
12 基板
13 ネジ
14 発光部
14s 発光面
20、920 受光素子
20a、920a 主面
21a、21b インクリメント検出部
21g 受光部グループ
22 第二アブソリュート検出部
22a 第二アブソリュート受光部
23 第一アブソリュート検出部
23a 第一アブソリュート受光部
23s、24s 受光面
24 回転数検出部
24a 円弧状受光部
40 回転板
42 本体
50 パターン部
51 第一パターン部
51a、52a、53a、54a 低反射領域
52 第二パターン部
53 第三パターン部
54 第四パターン部
211 第一受光部
211a 第一本体部
211b 第一分離部
211m 第一主位相部
211s 第一副位相部
212 第二受光部
212a 第二本体部
212b 第二分離部
213 第三受光部
213a 第三本体部
213b 第三分離部
214 第四受光部
214a 第四本体部
214b 第四分離部
Claims (8)
- 第一半径の第一円周上に配列され、アブソリュート方式で検出信号を出力する複数の第一アブソリュート受光部と、
インクリメント方式で検出信号を出力する複数の受光部グループと、を備え、
前記複数の受光部グループは、前記第一円周より大きい半径の領域に選択して配置され、かつ、前記第一円周と同心であって、前記第一半径より大きい第二半径の第二円周上に配列され、
前記複数の第一アブソリュート受光部と、前記複数の受光部グループとは、重ならない
受光素子。 - 前記第一円周と同心であり、前記第一半径よりも小さい第三半径の第三円周上に配置される円弧状受光部をさらに備え、
前記円弧状受光部は、前記第三円周の方向における幅が前記複数の第一アブソリュート受光部の各々における前記第一円周の方向に対する幅より大きく、
前記複数の第一アブソリュート受光部と、前記円弧状受光部とは、重ならない
請求項1に記載の受光素子。 - 前記第一円周と同心であり、前記第一半径よりも大きくかつ前記第二半径よりも小さい第四半径の第四円周上に配列され、アブソリュート方式で検出信号を出力する複数の第二アブソリュート受光部をさらに備え、
前記複数の第一アブソリュート受光部と、前記複数の第二アブソリュート受光部とは、重ならない
請求項1又は2に記載の受光素子。 - 光を出射する発光部をさらに備える
請求項1~3のいずれか1項に記載の受光素子。 - 前記複数の第一アブソリュート受光部と前記複数の第二アブソリュート受光部との間に配置され、光を出射する発光部をさらに備える
請求項3に記載の受光素子。 - 前記発光部は、前記光を出射する発光面を有し、
前記複数の第一アブソリュート受光部の各々は、前記光を受光する受光面を有し、
前記発光面は、前記受光面と同一平面上に配置される
請求項4又は5に記載の受光素子。 - 前記複数の受光部グループは、所定の配列ピッチで前記第二円周に沿った配列方向に配列され、
前記複数の受光部グループの各々は、第一受光部と、前記第一受光部に対して前記配列ピッチの1/4だけ前記配列方向にシフトされた位置に配置される第二受光部と、を有し、
前記第一受光部は、
前記配列方向に前記配列ピッチの1/3の幅を有する第一主位相部と、
前記配列方向に前記配列ピッチの1/3の幅を有し、前記第一主位相部に対して前記配列ピッチの1/12だけ前記配列方向にシフトされた位置であって、前記配列方向に対して垂直な垂直方向において前記第一主位相部と隣接する位置に配置される第一副位相部と、を有し、
前記第二受光部は、
前記配列方向に前記配列ピッチの1/3の幅を有する第二主位相部と、
前記配列方向に前記配列ピッチの1/3の幅を有し、前記第二主位相部に対して前記配列ピッチの1/12だけ前記配列方向にシフトされた位置であって、前記垂直方向において前記第二主位相部と隣接する位置に配置される第二副位相部と、を有し、
前記第一受光部は、前記配列方向における幅が前記配列ピッチの1/4未満である、第一本体部及び第一分離部に分離されており、前記第一本体部と前記第一分離部とは、前記垂直方向に離隔して配置され、
前記第二受光部は、前記配列方向における幅が前記配列ピッチの1/4未満である第二本体部及び第二分離部に分離されており、前記第二本体部と前記第二分離部とは、前記垂直方向に離隔して配置され、
前記第一本体部と前記第二本体部とは、前記配列方向に配列され、かつ、前記第一本体部と前記第二本体部との隙間は、前記配列ピッチの1/4未満であり、
前記第一分離部と前記第二分離部とは、前記配列方向に配列され、かつ、前記第一分離部と前記第二分離部との隙間は、前記配列ピッチの1/4未満である
請求項1~6のいずれか1項に記載の受光素子。 - 請求項4~6のいずれか1項に記載の受光素子と、
前記光が照射され、回転軸を中心に回転する回転板と、を備え、
前記光は、前記回転板を介して前記受光素子に照射される
回転検出器。
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JP2005121593A (ja) * | 2003-10-20 | 2005-05-12 | Sendai Nikon:Kk | アブソリュートエンコーダ |
JP4273442B2 (ja) | 1999-04-08 | 2009-06-03 | 株式会社安川電機 | 光学式エンコーダ |
JP2015090303A (ja) * | 2013-11-05 | 2015-05-11 | 株式会社安川電機 | エンコーダ、エンコーダ付きモータ、サーボシステム |
JP2015090300A (ja) * | 2013-11-05 | 2015-05-11 | 株式会社安川電機 | エンコーダ、エンコーダ付きモータ、サーボシステム |
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JP4273442B2 (ja) | 1999-04-08 | 2009-06-03 | 株式会社安川電機 | 光学式エンコーダ |
JP2005121593A (ja) * | 2003-10-20 | 2005-05-12 | Sendai Nikon:Kk | アブソリュートエンコーダ |
JP2015090303A (ja) * | 2013-11-05 | 2015-05-11 | 株式会社安川電機 | エンコーダ、エンコーダ付きモータ、サーボシステム |
JP2015090300A (ja) * | 2013-11-05 | 2015-05-11 | 株式会社安川電機 | エンコーダ、エンコーダ付きモータ、サーボシステム |
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