WO2023008259A1 - Codeur - Google Patents

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Publication number
WO2023008259A1
WO2023008259A1 PCT/JP2022/028074 JP2022028074W WO2023008259A1 WO 2023008259 A1 WO2023008259 A1 WO 2023008259A1 JP 2022028074 W JP2022028074 W JP 2022028074W WO 2023008259 A1 WO2023008259 A1 WO 2023008259A1
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WO
WIPO (PCT)
Prior art keywords
light receiving
light
curvature
radial
encoder
Prior art date
Application number
PCT/JP2022/028074
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English (en)
Japanese (ja)
Inventor
秀一 永井
大 白石
Original Assignee
パナソニックＩｐマネジメント株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by パナソニックＩｐマネジメント株式会社 filed Critical パナソニックＩｐマネジメント株式会社
Priority to JP2023538458A priority Critical patent/JPWO2023008259A1/ja
Priority to CN202280049430.5A priority patent/CN117642606A/zh
Publication of WO2023008259A1 publication Critical patent/WO2023008259A1/fr

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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

Definitions

  • the present disclosure relates to encoders.
  • Patent Literature 1 discloses a movement information measuring device that includes a light source, a moving body that has a curved surface in the movement direction, and a light receiving element that receives reflected light or transmitted light collected from the curved surface. It is
  • the present disclosure has been made to solve such problems, and aims to provide an encoder that can easily detect the position of a detection target.
  • An encoder includes a rotating rotating plate, an irradiation unit that emits light to the rotating plate, receives the light emitted from the emitting unit and passes through the rotating plate, and receives the light a light-receiving unit that outputs a signal corresponding to the rotating plate, wherein the rotating plate has a plurality of reflecting surfaces arranged in the rotating direction of the rotating plate, and each of the plurality of reflecting surfaces is centered on the rotation axis of the rotating plate. and reflects the light emitted from the irradiation unit to the reflecting surface toward the light receiving unit, and the plurality of reflecting surfaces are two or more different from each other has the radial curvature of
  • an encoder includes a substrate that moves linearly, an irradiation unit that irradiates the substrate with light, and receives the light that is irradiated from the irradiation unit and passes through the substrate, and receives the light.
  • a light-receiving part that outputs a signal according to light;
  • the substrate has a plurality of reflective surfaces arranged in a movement direction of the substrate; and reflects light emitted from the irradiation unit to the reflecting surface toward the light receiving unit, and the plurality of reflecting surfaces have two or more orthogonal directions different from each other. have curvature.
  • FIG. 1 is a perspective view showing an encoder according to the first embodiment.
  • FIG. 2A and 2B are diagrams showing radial progress of light reflected by the first reflecting surface and radial progress of light reflected by the second reflecting surface of the encoder of FIG. 3A and 3B are diagrams showing the traveling state of the light reflected by the first reflecting surface of the encoder in FIG. 1 in the rotating direction and the traveling state of the light reflected by the second reflecting surface in the rotating direction.
  • FIG. 4 is a perspective view showing an encoder according to the second embodiment.
  • FIG. 5 is a diagram showing a light receiving section of an encoder according to the third embodiment.
  • FIG. 6 is a diagram showing a light receiving section of an encoder according to the fourth embodiment.
  • FIG. 7 is a diagram showing a light receiving section of an encoder according to the fifth embodiment.
  • FIG. 8 is a diagram showing a light receiving section of an encoder according to the sixth embodiment.
  • FIG. 9 is a diagram showing a light receiving section of an encoder according to the seventh embodiment.
  • FIG. 10 is a perspective view showing an encoder according to the eighth embodiment.
  • each figure is a schematic diagram and is not necessarily strictly illustrated. Therefore, scales and the like are not always the same in each drawing. Moreover, in each figure, the same code
  • FIG. 1 is a perspective view showing an encoder 10 according to the first embodiment.
  • (b) of FIG. 1 is an enlarged view of a portion surrounded by a two-dot chain line in (a) of FIG.
  • illustration of a part of the plurality of reflecting surfaces 21 is omitted.
  • 2A and 2B are diagrams showing radial progress of light reflected by the first reflecting surface 22 and radial progress of light reflected by the second reflecting surface 23 of the encoder 10 of FIG.
  • FIG. 2(a) is an end view of the first reflecting surface 22 viewed in the rotational direction
  • FIG. 2(b) is an end view of the second reflecting surface 23 viewed in the rotational direction.
  • FIG. 1 is a perspective view showing an encoder 10 according to the first embodiment.
  • (b) of FIG. 1 is an enlarged view of a portion surrounded by a two-dot chain line in (a) of FIG.
  • illustration of a part of the plurality of reflecting surfaces 21 is omitted.
  • FIG. 3 is a diagram showing a traveling state of light reflected by the first reflecting surface 22 of the encoder 10 of FIG. 1 in the rotating direction and a traveling state of the light reflected by the second reflecting surface 23 in the rotating direction.
  • 3A is a view of the light receiving section 40 viewed from the axial direction
  • FIG. 3B is an end view of the first reflecting surface 22 and the second reflecting surface 23 viewed from the radial direction.
  • dots are attached to portions of the light receiving unit 40 where the light is irradiated. The same applies to FIGS. 5 to 9, which will be described later.
  • An encoder 10 according to a first embodiment will be described with reference to FIGS. 1 to 3.
  • the axial direction is the direction in which the rotation axis A extends (see arrow X in FIG. 1 etc.), and the rotation direction is the direction of rotation about the rotation axis A (arrow Y in FIG. 1 etc.). ), and the radial direction is a radial direction around the rotation axis A (see arrow Z in FIG. 1, etc.).
  • the encoder 10 is an optical rotary encoder. Specifically, the encoder 10 is a light reflective rotary encoder.
  • the encoder 10 detects rotation of a detection target. Specifically, for example, the encoder 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 rotary shaft 1 of the motor. That is, the encoder 10 detects the position of the rotary shaft 1, the direction of rotation of the rotary shaft 1, the number of revolutions of the rotary shaft 1, and the like.
  • the encoder 10 includes a rotating plate 20 , an irradiation section 30 and a light receiving section 40 .
  • the rotating plate 20 is a rotating substrate.
  • the rotating plate 20 is attached to the end of the rotating shaft 1 and rotates about the rotating axis A together with the rotating shaft 1 .
  • the rotating plate 20 has a plate-like shape whose thickness direction is the axial direction, and extends in a direction perpendicular to the rotation axis A. As shown in FIG.
  • the rotating plate 20 rotates both clockwise and counterclockwise when viewed from the axial direction.
  • the rotating plate 20 may rotate only clockwise or counterclockwise when viewed from the axial direction.
  • the rotating plate 20 is made of metal, resin, glass, ceramic, or the like.
  • the rotating plate 20 has a plurality of reflecting surfaces 21 .
  • the multiple reflecting surfaces 21 are arranged in the rotation direction of the rotating plate 20 .
  • a plurality of reflecting surfaces 21 are provided over the entire circumference of the rotating plate 20 in the rotating direction. That is, the plurality of reflecting surfaces 21 are arranged in the circumferential direction around the rotation axis A and are provided over the entire circumference in the circumferential direction.
  • each of the plurality of reflecting surfaces 21 is formed by chrome plating or the like.
  • Rotating plate 20 is provided at a position different from that of irradiating unit 30 and light receiving unit 40 in the axial direction. ing.
  • Each of the plurality of reflective surfaces 21 reflects the light emitted from the irradiation section 30 to the reflective surface toward the light receiving section 40 .
  • the light emitted from the irradiation unit 30 does not irradiate all of the plurality of reflective surfaces 21 at the same time, but irradiates some of the plurality of reflective surfaces 21 at the same time.
  • the reflecting surface 21 irradiated with the light emitted from the irradiation unit 30 differs depending on the rotational position of the rotating plate 20 .
  • Each of the plurality of reflecting surfaces 21 reflects the light applied to the reflecting surface 21 toward the light receiving unit 40 when the reflecting surface 21 is irradiated with light from the irradiation unit 30 .
  • Each of the plurality of reflecting surfaces 21 has a radial curvature that is a curvature in the radial direction.
  • the multiple reflective surfaces 21 have two or more radial curvatures different from each other.
  • the plurality of reflecting surfaces 21 have two different radial curvatures. That is, in the present embodiment, the plurality of reflecting surfaces 21 are composed of the first reflecting surface 22 having the first radial curvature and the second reflecting surface 23 having the second radial curvature different from the first radial curvature. , and each of the plurality of reflecting surfaces 21 is either one of the first reflecting surface 22 and the second reflecting surface 23 .
  • the first radial curvature is greater than 0%
  • the first reflecting surface 22 has a concave shape that is concave in the axial direction in a cross section perpendicular to the direction of rotation. It is a curved surface.
  • the first reflecting surface 22 reflects the light emitted from the irradiation section 30 toward the light receiving section 40 and irradiates a predetermined range of the light receiving section 40 with the light.
  • the second radial curvature is greater than 0%
  • the second reflecting surface 23 has a concave shape that is concave in the axial direction in a cross section orthogonal to the direction of rotation. It is a curved surface.
  • the second radial curvature is greater than the first radial curvature.
  • the second reflecting surface 23 is more steeply curved than the first reflecting surface 22 .
  • the first reflecting surface 22 is curved more gently than the second reflecting surface 23 .
  • the second reflecting surface 23 reflects the light emitted from the irradiation section 30 toward the light receiving section 40 and irradiates a predetermined range of the light receiving section 40 with the light.
  • the radial range of the light-receiving section 40 irradiated with the light reflected by the second reflecting surface 23 is the first reflecting surface 22 is smaller than the radial extent over which the light reflected by is irradiated.
  • the radial range of the light-receiving section 40 irradiated with light can be changed according to the rotational position of the rotating plate 20. can be different.
  • each of the plurality of reflecting surfaces 21 has a radial curvature, the light emitted to each of the plurality of reflecting surfaces 21 can be efficiently condensed on the light receiving section 40 .
  • each of the plurality of reflective surfaces 21 has a curvature in the rotational direction of the rotating plate 20 .
  • the multiple reflecting surfaces 21 have a single rotational curvature. That is, in the present embodiment, the rotational curvature of each of the plurality of reflecting surfaces 21 is equal to the rotational curvature of the reflecting surfaces 21 other than the reflecting surface 21 among the plurality of reflecting surfaces 21 .
  • the rotational curvature of the first reflecting surface 22 is equal to the rotational curvature of the second reflecting surface 23 .
  • the curvature in the rotational direction is greater than 0%
  • each of the first reflecting surface 22 and the second reflecting surface 23 is a concave curved surface concave in the axial direction in a cross section perpendicular to the radial direction.
  • each of the plurality of reflecting surfaces 21 has a curvature in the rotational direction, so that the range in the rotational direction of the light receiving section 40 irradiated with light can be made smaller.
  • each of the plurality of reflecting surfaces 21 has a curvature in the rotational direction, the light emitted to each of the plurality of reflecting surfaces 21 can be efficiently condensed on the light receiving section 40 .
  • the irradiation unit 30 irradiates the rotating plate 20 with light.
  • the irradiation unit 30 is configured by a light-emitting element such as an LED (Light Emitting Diode).
  • the light emitted from the irradiation unit 30 is visible light such as white light, infrared light, or the like.
  • the light receiving unit 40 receives light emitted from the irradiation unit 30 and passed through the rotating plate 20, and outputs a signal corresponding to the received light. Specifically, the light receiving section 40 receives light reflected by each of the plurality of reflecting surfaces 21 and outputs a signal corresponding to the received light. As shown in (a) of FIG. 3, the light receiving section 40 has a plurality of area rows in which a plurality of light receiving areas are arranged in the rotational direction, and the plurality of area rows are arranged in the radial direction.
  • the multiple area rows include a first area row, a second area row, and a third area row.
  • the first region row is composed of a plurality of first light receiving regions 41a, 41b, 41c arranged in the rotational direction.
  • the light receiving section 40 outputs a signal corresponding to the intensity of light received by each of the plurality of first light receiving regions 41a, 41b, and 41c.
  • each of the plurality of first light receiving regions 41a, 41b, 41c is a light receiving region of a light receiving element such as a photodiode.
  • each of the plurality of first light receiving regions 41a, 41b, and 41c may be a light receiving region of an image sensor.
  • the respective dimensions of the plurality of first light receiving regions 41a, 41b, 41c in the rotational direction are the respective dimensions of the plurality of second light receiving regions 42a, 42b, 42c and the respective dimensions of the plurality of third light receiving regions 43a, 43b, 43c. smaller than each dimension.
  • the second region row is configured by arranging a plurality of second light receiving regions 42a, 42b, 42c in the rotational direction.
  • the second row of regions is aligned with the first row of regions in the radial direction.
  • the second light receiving region 42a is aligned with the first light receiving region 41a
  • the second light receiving region 42b is aligned with the first light receiving region 41b
  • the second light receiving region 42c is aligned with the first light receiving region 41c.
  • the light receiving section 40 outputs a signal corresponding to the intensity of light received by each of the plurality of second light receiving regions 42a, 42b, 42c.
  • each of the plurality of second light receiving regions 42a, 42b, 42c is a light receiving region of a light receiving element such as a photodiode.
  • each of the plurality of second light receiving regions 42a, 42b, 42c may be a light receiving region of an image sensor.
  • the third region row is composed of a plurality of third light receiving regions 43a, 43b, 43c arranged in the rotational direction.
  • the third region row is aligned with the first region row and the second region row in the radial direction.
  • the third light receiving region 43a is aligned with the first light receiving region 41a and the second light receiving region 42a
  • the third light receiving region 43b is aligned with the first light receiving region 41b and the second light receiving region 42b
  • the third light receiving region 43c is aligned with the first light receiving region 41b and the second light receiving region 42b. It is aligned with the first light receiving region 41c and the second light receiving region 42c.
  • the light receiving section 40 outputs a signal corresponding to the intensity of light received by each of the plurality of third light receiving regions 43a, 43b, 43c.
  • each of the plurality of third light receiving regions 43a, 43b, 43c is a light receiving region of a light receiving element such as a photodiode.
  • each of the plurality of third light receiving regions 43a, 43b, and 43c may be a light receiving region of an image sensor.
  • the plurality of reflective surfaces 21 have a curvature in the rotational direction so that the light receiving section 40 outputs incremental signals.
  • the rotation direction curvature can narrow the range in the rotation direction in which light is emitted from the light receiving unit 40 .
  • the plurality of reflecting surfaces 21 have two radial curvatures so that the light receiving section 40 outputs an absolute signal.
  • the first reflecting surface 22 has a first radial curvature such that the light reflected by the first reflecting surface 22 is irradiated onto the first row of regions, the second row of regions, and the third row of regions.
  • the second reflective surface 23 has a second diameter so that the light reflected by the second reflective surface 23 illuminates the first row of regions without irradiating the second row of regions and the third row of regions. It has directional curvature.
  • all of the plurality of second light receiving areas 42a, 42b, 42c can be irradiated with light at the same time.
  • the plurality of second light receiving regions 42a and 42c can be simultaneously irradiated with light, and the second light receiving regions 42a and 42c can be irradiated with light simultaneously.
  • the light-receiving region 42b can be prevented from being irradiated with light.
  • the signal output from the light receiving section 40 becomes an absolute signal. This makes it possible to detect the absolute position of the detection target.
  • the second light receiving region 42a and the second light receiving region 42c are not irradiated with light, and the second light receiving region 42b is irradiated with light.
  • “0" is output for the second light receiving region 42a
  • "1" is output for the second light receiving region 42b
  • "0" is output for the second light receiving region 42c.
  • the combination of these signals output by the light receiving section 40 is a signal that can specify the absolute position of the detection target, and is an absolute signal.
  • the third light receiving region 43a and the third light receiving region 43c are not irradiated with light, and the third light receiving region 43b is irradiated with light.
  • “0" is output for the third light receiving region 43a
  • "1" is output for the third light receiving region 43b
  • "0" is output for the third light receiving region 43c.
  • the combination of these signals output by the light receiving section 40 is a signal that can specify the absolute position of the detection target, and is an absolute signal.
  • the encoder 10 according to the first embodiment has been described above.
  • the encoder 10 includes a rotary plate 20 that rotates, an irradiation unit 30 that irradiates the rotary plate 20 with light, and receives the light that is emitted from the irradiation unit 30 and passes through the rotary plate 20,
  • the rotating plate 20 has a plurality of reflecting surfaces 21 arranged in the rotating direction of the rotating plate 20, and each of the plurality of reflecting surfaces 21 corresponds to the rotating plate.
  • the reflective surface 20 has a radial curvature that is a curvature in a radial direction centered on the rotation axis A of the reflective surface 20, and reflects the light emitted from the irradiation unit 30 to the reflective surface toward the light receiving unit 40, and the plurality of reflective surfaces 21 , have two mutually different radial curvatures.
  • the plurality of reflecting surfaces 21 have two mutually different radial curvatures, the amount of light irradiated to the light receiving section 40 is suppressed from decreasing, and the rotation position of the rotating plate 20 is adjusted. Accordingly, it is possible to easily change the radial range of the light-receiving unit 40 irradiated with light, so that the position of the detection target can be easily detected.
  • each of the plurality of reflecting surfaces 21 has a rotational curvature that is a curvature in the rotational direction.
  • the multiple reflecting surfaces 21 have a single curvature in the rotational direction.
  • the light receiving section 40 can be regularly irradiated with light, so that the position of the detection target can be detected more easily.
  • the light receiving section 40 has a plurality of area rows in which a plurality of light receiving areas are arranged in the rotational direction, and the plurality of area rows are arranged in the radial direction.
  • the light receiving section 40 it is possible to cause the light receiving section 40 to output various patterns of signals by irradiating only one of the plurality of area rows with light or all of the plurality of area rows with light. Therefore, the position of the detection target can be detected more easily.
  • the plurality of reflecting surfaces 21 have two or more radial curvatures so that the light receiving section 40 outputs an absolute signal.
  • the absolute position of the detection target can be specified, so the position of the detection target can be detected more easily.
  • FIG. 4 is a perspective view showing an encoder 10a according to the second embodiment.
  • (b) of FIG. 4 is an enlarged view of a portion surrounded by a two-dot chain line in (a) of FIG. 4 .
  • illustration of some of the plurality of reflecting surfaces 21a is omitted.
  • the encoder 10a is mainly different from the encoder 10 in that it has a rotating plate 20a different from the rotating plate 20.
  • the rotating plate 20a is mainly different from the rotating plate 20 in that it has a plurality of reflecting surfaces 21a different from the plurality of reflecting surfaces 21.
  • the plurality of reflecting surfaces 21 a mainly differs from the plurality of reflecting surfaces 21 in that it has a third reflecting surface 24 instead of the first reflecting surface 22 .
  • the third reflecting surface 24 has a radial curvature of 0%. That is, in this embodiment, the two radial curvatures include 0% curvature.
  • the third reflecting surface 24 is not curved in a cross section perpendicular to the direction of rotation.
  • the third reflecting surface 24 has a rotational curvature of 0%. That is, in the present embodiment, the plurality of reflecting surfaces 21a have two curvatures in the rotational direction, and the two curvatures in the rotational direction include a curvature of 0%.
  • the third reflecting surface 24 is not curved in a cross section perpendicular to the radial direction.
  • the third reflecting surface 24 is flat.
  • the plurality of reflecting surfaces 21 a may include the first reflecting surface 22 , the second reflecting surface 23 and the third reflecting surface 24 .
  • the encoder 10a according to the second embodiment has been described above.
  • the two radial curvatures include 0% curvature.
  • FIG. 5 is a diagram showing a light receiving section 50 of an encoder according to the third embodiment. An encoder according to the third embodiment will be described with reference to FIG.
  • the encoder according to the third embodiment includes a light receiving section 50 different from the light receiving section 40 and a plurality of reflecting surfaces (not shown) different from the plurality of reflecting surfaces 21.
  • the main difference from the encoder 10 is that
  • the light receiving section 50 mainly differs from the light receiving section 40 in that it does not have the third region row.
  • the plurality of reflecting surfaces in the third embodiment have two or more radial curvatures so that the light receiving section 50 outputs incremental signals.
  • the plurality of reflective surfaces include a reflective surface having a radial curvature so that the second row of regions is irradiated with light, and a reflective surface having a radial curvature so that the second row of regions is not irradiated with light. are arranged alternately.
  • the plurality of reflecting surfaces have two or more radial curvatures so that the light receiving section 50 outputs incremental signals.
  • the relative position of the detection target can be specified, the position of the detection target can be detected more easily.
  • FIG. 6 is a diagram showing a light receiving section 60 of an encoder according to the fourth embodiment. An encoder according to the fourth embodiment will be described with reference to FIG.
  • the encoder according to the fourth embodiment includes a light receiving section 60 different from the light receiving section 40 and a plurality of reflecting surfaces (not shown) different from the plurality of reflecting surfaces 21.
  • the main difference from the encoder 10 is that
  • the light receiving section 60 is mainly different from the light receiving section 40 in that it has more rows of regions than the light receiving section 40 does. Specifically, the light receiving section 60 includes a first row of areas, a second row of areas, a third row of areas, a fourth row of areas, a fifth row of areas, a sixth row of areas, and a seventh row of areas. and
  • the first region row is configured by arranging a plurality of first light receiving regions 61 in the rotational direction.
  • the second region row is configured by arranging a plurality of second light receiving regions 62 in the rotational direction.
  • the third region row is configured by arranging a plurality of third light receiving regions 63 in the rotational direction.
  • the fourth area row is configured by arranging a plurality of fourth light receiving areas 64 in the rotational direction.
  • the fifth area row is configured by arranging a plurality of fifth light receiving areas 65 in the rotational direction.
  • the sixth area row is formed by arranging a plurality of sixth light receiving areas 66 in the rotational direction.
  • the seventh area row is formed by arranging a plurality of seventh light receiving areas 67 in the rotational direction.
  • the plurality of reflecting surfaces in the fourth embodiment are mainly different from the plurality of reflecting surfaces 21 in that they have four or more radial curvatures.
  • the first reflecting surface has a radial curvature so as to irradiate the first to seventh area rows with light.
  • the second reflective surface has a radial curvature so as to irradiate light to the first to fifth area rows and not to irradiate the sixth and seventh area rows.
  • the third reflecting surface has a radial curvature so as to irradiate light to the first to third area rows and not to irradiate light to the fourth to seventh area rows.
  • the four reflective surfaces have radial curvatures so as to irradiate the first row of regions with light and not irradiate the second to seventh row of regions with light.
  • the light receiving section 60 may have four or more area rows, and the plurality of reflecting surfaces may have four or more radial curvatures.
  • the encoder according to the fourth embodiment has been described above.
  • FIG. 7 is a diagram showing a light receiving section 70 of an encoder according to the fifth embodiment. An encoder according to the fifth embodiment will be described with reference to FIG.
  • the encoder according to the fifth embodiment includes a light receiving section 70 different from the light receiving section 40 and a plurality of reflecting surfaces (not shown) different from the plurality of reflecting surfaces 21.
  • the main difference from the encoder 10 is that
  • the light receiving section 70 has a first row of regions, a second row of regions, and a third row of regions.
  • the first row of regions includes a plurality of first light receiving regions 71 aligned in the rotational direction
  • the second row of regions includes a plurality of second light receiving regions 72 aligned in the direction of rotation
  • the third The row of regions is formed by arranging a plurality of third light receiving regions 73 in the rotational direction.
  • the first region row in the light receiving section 40 is characterized in that the dimension of each of the plurality of first light receiving regions 71 in the rotational direction is smaller than the dimension of each of the plurality of first light receiving regions 41a, 41b, and 41c. differ mainly from
  • the second region row in the light receiving section 40 is characterized in that the dimension of each of the plurality of second light receiving regions 72 in the rotational direction is smaller than the dimension of each of the plurality of second light receiving regions 42a, 42b, and 42c. differ mainly from
  • the third region row in the light receiving section 40 is characterized in that the dimension of each of the plurality of third light receiving regions 73 in the rotational direction is smaller than the dimension of each of the plurality of third light receiving regions 43a, 43b, and 43c. differ mainly from
  • the position of the detection target can be detected more finely than the encoder 10.
  • the light receiving section 70 may output a signal indicating the received light intensity of the light received by each of the plurality of first light receiving regions 71 .
  • the rotating plate rotates from a state in which light is applied to one of the first light receiving regions 71 of the plurality of first light receiving regions 71, and (b) of FIG. ), as shown in FIG. 7C, the first light receiving region 71 adjacent to the first light receiving region 71 among the plurality of first light receiving regions 71 is irradiated with light. In this state, the position of the detection target can be detected more finely based on the intensity of light received by these two first light receiving regions 71 .
  • FIG. 8 is a diagram showing a light receiving section 80 of an encoder according to the sixth embodiment. An encoder according to the sixth embodiment will be described with reference to FIG.
  • the encoder according to the sixth embodiment is mainly different from the encoder according to the fifth embodiment in that it includes a light receiving section 80 different from the light receiving section 70. different.
  • the light receiving section 80 is mainly different from the light receiving section 70 in that it has a second region row different from the second region row of the light receiving section 70 .
  • the second region row is configured by arranging a plurality of first light receiving regions 81a, 81b, 81c, 81d, 81e, and 81f in the rotational direction.
  • the first light receiving area 81a is provided so that the dimension in the radial direction gradually decreases toward one side in the rotation direction.
  • the first light receiving region 81b is provided so that the dimension in the radial direction gradually increases toward one side in the rotation direction.
  • the first light receiving region 81a and the first light receiving region 81b face each other in the radial direction.
  • the first light receiving area 81c is provided so that the dimension in the radial direction gradually decreases toward one side in the rotation direction.
  • the first light receiving area 81d is provided so that the dimension in the radial direction gradually increases toward one side in the rotation direction.
  • the first light receiving region 81c and the first light receiving region 81d face each other in the radial direction.
  • the first light receiving area 81e is provided so that the dimension in the radial direction gradually decreases toward one side in the rotation direction.
  • the first light receiving region 81f is provided so that the dimension in the radial direction gradually increases toward one side in the rotation direction.
  • the first light receiving region 81e and the first light receiving region 81f face each other in the radial direction.
  • the position of the detection target can be detected based on the ratio of the light receiving intensity of the light received by the first light receiving region 81a and the light receiving intensity of the light received by the first light receiving region 81b.
  • the encoder according to the sixth embodiment has been described above.
  • FIG. 9 is a diagram showing a light receiving section 90 of an encoder according to the seventh embodiment. An encoder according to the seventh embodiment will be described with reference to FIG.
  • the encoder according to the seventh embodiment includes a light receiving portion 90 different from the light receiving portion 40, and a plurality of reflecting surfaces (not shown) different from the plurality of reflecting surfaces 21.
  • the main difference from the encoder 10 is that it is provided with
  • the light receiving section 90 has a first row of regions, a second row of regions, and a third row of regions.
  • the first row of regions is configured by arranging a plurality of first light receiving regions 91 in the direction of rotation
  • the second row of regions is configured by arranging a plurality of second light receiving regions 92a, 92b, 92c, and 92d in the direction of rotation
  • the third region row is configured by arranging a plurality of third light receiving regions 93a, 93b, 93c, and 93d in the rotational direction.
  • the plurality of third light receiving regions 93a, 93b, 93c and 93d are arranged shifted in the rotational direction with respect to the plurality of second light receiving regions 92a, 92b, 92c and 92d.
  • the plurality of second light receiving regions 92b and 92c are irradiated with light, and the plurality of second light receiving regions 92a and 92d are not irradiated with light.
  • the light receiving section 90 outputs “0” for the second light receiving region 92a, outputs “1” for the second light receiving region 92b, outputs “1” for the second light receiving region 92c, and outputs “1” for the second light receiving region 92d. Output "0".
  • the third light receiving region 93b is irradiated with light, and the plurality of third light receiving regions 93a, 93c, and 93d are not irradiated with light.
  • 90 outputs "0" for the third light receiving region 93a, "1” for the third light receiving region 93b, "0” for the third light receiving region 93c, and "0" for the third light receiving region 93d. ' is output.
  • the logical AND with the signal “0” obtained is “0".
  • the logical product with is "1".
  • the logical product with is “0".
  • the logical product with is "0".
  • the plurality of reflecting surfaces have two or more radial curvatures so that the four signals "0", “1”, “0”, and "0" obtained by logical AND are absolute signals. You may have
  • the intensity of light received by the second light receiving region 92b, the intensity of light received by the second light receiving region 92c, and The light receiving intensity of the received light may be compared, and the signal output from the light receiving unit 90 based on the light received by the area row associated with the highest light receiving intensity may be used as the absolute signal.
  • the encoder according to the seventh embodiment has been described above.
  • FIG. 10 is a perspective view showing an encoder 100 according to the eighth embodiment.
  • (b) of FIG. 10 is an enlarged view of a portion surrounded by a two-dot chain line in (a) of FIG. 10 .
  • illustration of some of the plurality of reflecting surfaces 121 is omitted.
  • An encoder 100 according to the eighth embodiment will be described with reference to FIG.
  • the encoder 100 is an optical linear encoder. Specifically, the encoder 100 is a light reflective linear encoder.
  • the encoder 100 detects movement of a detection target. Specifically, for example, the encoder 100 detects the position of the detection target, the moving direction of the detection target, and the like.
  • the detection target is a linear motor.
  • the encoder 100 includes a substrate 120 , an irradiation section 30 and a light receiving section 40 .
  • the substrate 120 is a substrate that moves linearly.
  • the substrate 120 is attached to a linear motor and moves with the linear motor.
  • substrate 120 is made of metal, resin, glass, ceramic, or the like.
  • the substrate 120 has multiple reflective surfaces 121 .
  • the plurality of reflective surfaces 121 are arranged in the moving direction of the substrate 120 (see arrow Y1 in FIG. 10).
  • each of the plurality of reflecting surfaces 121 is formed by chrome plating or the like.
  • a plurality of reflecting surfaces 121 are provided on the main surface of the substrate 120 on the side of the irradiation unit 30 and the light receiving unit 40 .
  • Each of the plurality of reflective surfaces 121 reflects the light emitted from the irradiation section 30 to the reflective surface toward the light receiving section 40 .
  • the light emitted from the irradiation unit 30 does not irradiate all of the plurality of reflective surfaces 121 at the same time, but irradiates some of the plurality of reflective surfaces 121 at the same time.
  • the reflecting surface 121 irradiated with the light emitted from the irradiation unit 30 differs depending on the position of the substrate 120 .
  • Each of the plurality of reflecting surfaces 121 reflects the light applied to the reflecting surface 121 toward the light receiving unit 40 when the reflecting surface 121 is irradiated with light from the irradiation unit 30 .
  • Each of the plurality of reflective surfaces 121 has an orthogonal direction curvature that is a curvature in an orthogonal direction (see arrow Z1 in FIG. 10) perpendicular to the moving direction of the substrate 120 .
  • the multiple reflective surfaces 121 have two or more orthogonal curvatures that are different from each other.
  • the plurality of reflective surfaces 121 have two mutually different curvatures in orthogonal directions. That is, in the present embodiment, the plurality of reflecting surfaces 121 are composed of the first reflecting surface 122 having the first orthogonal curvature and the second reflecting surface 123 having the second orthogonal curvature different from the first orthogonal curvature.
  • each of the plurality of reflective surfaces 121 is either one of the first reflective surface 122 and the second reflective surface 123 .
  • the first orthogonal direction curvature is greater than 0%
  • the first reflecting surface 122 is a concave curved surface that is concave in a cross section orthogonal to the movement direction.
  • the first reflecting surface 122 reflects the light emitted from the irradiation section 30 toward the light receiving section 40 and irradiates a predetermined range of the light receiving section 40 with the light.
  • the second orthogonal direction curvature is greater than 0%
  • the second reflecting surface 123 is a concave curved surface that is concave in a cross section orthogonal to the movement direction.
  • the second orthogonal curvature is greater than the first orthogonal curvature.
  • the second reflecting surface 123 is more steeply curved than the first reflecting surface 122 .
  • the first reflecting surface 122 is more gently curved than the second reflecting surface 123 .
  • the second reflecting surface 123 reflects the light emitted from the irradiation section 30 toward the light receiving section 40 and irradiates a predetermined range of the light receiving section 40 with the light.
  • each of the plurality of reflecting surfaces 121 may have a curvature in the moving direction.
  • the second orthogonal direction curvature is larger than the first orthogonal direction curvature. is smaller than the orthogonal extent to which the light reflected by is illuminated.
  • the plurality of reflecting surfaces 121 have two mutually different curvatures in the orthogonal direction, so that the range in the orthogonal direction in which the light is irradiated in the light receiving section 40 can be varied.
  • each of the plurality of reflecting surfaces 121 has a curvature in the orthogonal direction, the light irradiated to each of the plurality of reflecting surfaces 121 can be efficiently condensed on the light receiving section 40 .
  • the irradiation unit 30 irradiates the substrate 120 with light.
  • the light receiving unit 40 receives the light emitted from the irradiation unit 30 and passed through the substrate 120, and outputs a signal corresponding to the received light.
  • the encoder 100 according to the eighth embodiment has been described above.
  • the encoder 100 includes a substrate 120 that moves linearly, an irradiation unit 30 that irradiates the substrate 120 with light, and receives the light that is irradiated from the irradiation unit 30 and passes through the substrate 120,
  • the substrate 120 has a plurality of reflective surfaces 121 arranged in the movement direction of the substrate 120, and each of the plurality of reflective surfaces 121 is orthogonal to the movement direction. and reflects light emitted from the irradiation unit 30 to the reflecting surface toward the light receiving unit 40, and the plurality of reflecting surfaces 121 has two mutually different orthogonal directions. have curvature.
  • the plurality of reflecting surfaces 121 have two mutually different curvatures in the orthogonal direction, the amount of light irradiated to the light receiving unit 40 is suppressed from decreasing, and the light intensity is adjusted according to the position of the substrate 120 . Since the range in the orthogonal direction in which the light is irradiated in the light receiving section 40 can be easily changed, the position of the detection target can be easily detected.
  • the multiple reflective surfaces may have three or more radial curvatures that are different from each other.
  • the plurality of reflecting surfaces 21 have a single curvature in the rotational direction, but the present invention is not limited to this.
  • the plurality of reflective surfaces 21 may have two or more different rotational curvatures.
  • the plurality of reflective surfaces may not have curvature in the rotational direction.
  • the present invention is not limited to this.
  • the multiple reflective surfaces may have three or more orthogonal curvatures that are mutually different.
  • the light receiving section 40 has a plurality of area rows
  • the present invention is not limited to this.
  • the light receiver may have one array of areas instead of multiple arrays.
  • the encoder according to the present disclosure is useful for devices and devices such as motors that rotate or move linearly.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optical Transform (AREA)

Abstract

Un codeur (10) comprend : une plaque rotative (20) qui tourne ; une unité de rayonnement (30) qui irradie une lumière vers la plaque rotative (20) ; et une unité de réception de lumière (40) qui reçoit la lumière qui a été émise par l'unité de rayonnement (30) et qui est passée à travers la plaque rotative (20), et qui délivre un signal correspondant à la lumière reçue. La plaque rotative (20) présente une pluralité de surfaces réfléchissantes (21) agencées dans la direction de rotation de la plaque rotative (20). Chaque surface réfléchissante de la pluralité de surfaces réfléchissantes (21) présente une courbure radiale qui est la courbure dans une direction radiale autour d'un axe de rotation (A) de la plaque rotative (20). La lumière émise par l'unité de rayonnement (30) sur les surfaces réfléchissantes est réfléchie vers l'unité de réception de lumière (40), et la pluralité de surfaces réfléchissantes (21) présentent deux ou plus de deux courbures radiales qui sont différentes les unes des autres.
PCT/JP2022/028074 2021-07-27 2022-07-19 Codeur WO2023008259A1 (fr)

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CN202280049430.5A CN117642606A (zh) 2021-07-27 2022-07-19 编码器

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JP2021-122828 2021-07-27

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11153453A (ja) * 1997-11-21 1999-06-08 Asmo Co Ltd 回転角度検出装置
JP2018511030A (ja) * 2015-03-05 2018-04-19 アップル インコーポレイテッド 方向依存光学特性を有する光学エンコーダ

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11153453A (ja) * 1997-11-21 1999-06-08 Asmo Co Ltd 回転角度検出装置
JP2018511030A (ja) * 2015-03-05 2018-04-19 アップル インコーポレイテッド 方向依存光学特性を有する光学エンコーダ

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