TW202001193A - Encoder and servomotor - Google Patents

Abstract

An encoder according to the present invention includes a substrate fixing portion (3) and a protrusion (3c) axially extending from a corner (31) of the substrate fixing portion (3). The encoder has a substrate (1) having a recess (1d) recessed from a substrate outer peripheral portion (1c) toward the inner side in the radial direction of the substrate fixing portion (3) to allow the protrusion (3c) to be fit therein, and an adhesive (11) provided in a gap formed between the protrusion (3c) and the recess (1d). A wall surface (10) forming the recess (1d) has a first positioning surface (1d1) in contact with any one of a first end surface (3c1) of the protrusion (3c) in the circumferential direction of the substrate fixing portion (3) and a second end surface (3c2) opposite to the first end surface (3c1) to determine the circumferential position of the substrate (1), and a second positioning surface (1d2) in contact with an inner surface (3c3) of the projection (3c) in the radial direction to determine the radial position of the substrate (1).

Description

Encoder and servo motor

The invention relates to an encoder and a servo motor for detecting the rotational position of the rotor.

Patent Document 1 discloses a technique for fixing an encoder substrate to a housing using an adhesive. In the encoder substrate disclosed in Patent Document 1, a plurality of through-holes for filling the adhesive are spaced apart from each other and arranged in a ring-like manner, and in the case where the encoder substrate is to be provided, they penetrate Plural holes are formed at positions corresponding to the holes. In addition, in the housing, a plurality of positioning protrusions are arranged separately from each other for aligning the substrate provided on the housing. In the encoder configured in this way, when the through-hole and the hole are axially communicated with each other and the encoder substrate is provided in the housing, the encoder substrate is held by the plurality of positioning protrusions. In addition, after the encoder substrate is provided in the housing, the through hole and the hole are filled with an adhesive to fix the encoder substrate to the housing. [Patent Literature]

Patent Document 1: Japanese Patent Laid-Open No. 2008-309675

[Problems to be solved by the invention]

However, in the encoder disclosed in Patent Document 1, a plurality of holes must be provided in the housing to attach the encoder substrate to the housing. Furthermore, in order to compensate for the loss of the surface of the substrate due to the provision of through holes, it is necessary to add Large substrate. Therefore, there is a limit to reducing the diameters of the housing and the board in order to reduce the size of the encoder. Therefore, there is a problem that the size of the entire encoder cannot be further reduced.

The present invention was invented in view of the above circumstances, and its object is to obtain an encoder that can be miniaturized even when the substrate in the state where positioning has been performed is fixed to the housing. [Means to solve the problem]

In order to solve the above problems and achieve the objective, the encoder of the present invention includes: a cylindrical substrate fixing portion; and a protrusion provided at an angle formed by the axial end of the substrate fixing portion and the peripheral portion of the substrate fixing portion Part, and extends axially from the corner. The encoder is provided with a substrate and a fixing member, the substrate having: a substrate surface in contact with the end; and a pit formed in a peripheral portion of the substrate surrounding the substrate surface and recessed radially inward from the peripheral portion of the substrate toward the substrate fixing portion The protrusion is embedded; the fixing member is provided in the gap formed between the protrusion and the recess. The wall surface constituting the pit is provided with: a first positioning surface, which contacts the first end surface protruding in the circumferential direction of the substrate fixing portion and the second end surface opposite to the first end surface to determine the circumferential direction of the substrate And the second positioning surface is in contact with the inner surface of the protrusion in the radial direction to determine the radial position of the substrate. [Effect of the invention]

The encoder of the present invention can achieve the effect that it can be miniaturized even when the substrate in the state where positioning has been performed is fixed to the housing.

Hereinafter, the encoder and the servo motor according to the embodiment of the present invention will be described in detail based on the drawings. Furthermore, the invention is not limited to this embodiment. [First embodiment]

Fig. 1 is a perspective view of an encoder according to a first embodiment of the present invention. Figure 2 is an enlarged view of the pits and protrusions shown in Figure 1. The encoder 100 of the first embodiment includes a substrate 1, an electronic component 2, and a cylindrical substrate fixing portion 3, wherein the substrate 1 has a first substrate surface 1a and a second substrate opposite to the first substrate surface 1a side In the surface 1b, the electronic component 2 is provided on the second substrate surface 1b. The substrate fixing portion 3 has an end portion 3a in contact with the first substrate surface 1a, and the substrate 1 is fixed to the end portion 3a. In addition, the encoder 100 includes a bottomed cylindrical cover 5 having a bottom 5a facing the electronic component 2 and a cylindrical portion rotatably fitted into the outer peripheral portion 3b of the substrate fixing portion 3 5b.

The first substrate surface 1a is the end surface of the substrate 1 facing the substrate fixing portion 3. The second substrate surface 1b is an end surface of the substrate 1 facing the bottom 5a of the lid 5. The cover 5 is an element for suppressing the deterioration of the insulation performance caused by the intrusion of dust into the encoder 100 or the metal sheet or the like.

The axial direction extending through the central axis AX of the radial center of the substrate fixing portion 3 is equivalent to the direction indicated by symbol D1 in FIG. 1. The circumferential direction of the board fixing portion 3 is equivalent to the direction indicated by symbol D2 in FIG. 1. The radial direction of the board fixing portion 3 is equal to the direction indicated by symbol D3 in the second drawing.

The electronic component 2 may be, for example, a signal generating circuit that generates a signal indicating the rotation position of the rotor, or a signal output circuit that outputs the signal to an unillustrated encoder lead, or may be configured to be The power provided by the servo amplifier outside the encoder 100 is supplied to the components of the power supply circuit such as the position detection unit. The electronic component 2 is, for example, an IC (integrated circuit), resistor, coil, capacitor, or the like. There may be one or more electronic components 2. In order to simplify the description, the electronic component 2 is simulated with a cylindrical structure in FIGS. 1 and 2.

The board fixing portion 3 uses a screw 7 and is detachably fixed to the bracket 8. The bracket 8 is a member that closes the axial end of the motor housing (not shown). The substrate fixing portion 3 is manufactured using an insulating material separately from the bracket 8 before being attached to the bracket 8, but it may also be manufactured integrally using the insulating material and the bracket 8. The insulating material is, for example, polybutylene terephthalate, polyphenylene sulfide, liquid crystal polymer, or the like. Using an insulating resin and manufacturing the substrate fixing portion 3 by die casting, it is possible to inexpensively manufacture the substrate fixing portion 3 having a complicated shape.

Three protrusions 3c are formed in the board fixing portion 3. The protrusion 3c is provided at the corner portion 31 formed by the axial end portion 3a of the substrate fixing portion 3 and the peripheral portion 3b of the substrate fixing portion 3, and is a protruding member extending from the corner portion 31 in the axial direction. The end portion 3a of the board fixing portion 3 is the end portion on the opposite side to the bracket 8 side of the board fixing portion 3. The three protrusions 3c are arranged apart from each other in the circumferential direction. The protrusion 3c is embedded in the recess 1d formed in the substrate 1. The dimple 1d is formed in the substrate peripheral portion 1c surrounding the first substrate surface 1a and the second substrate surface 1b. The dimple 1d is a recessed portion that is recessed radially inward from the peripheral portion 1c of the substrate. The plurality of dimples 1d are provided corresponding to the plurality of protrusions 3c, respectively. In FIG. 1, three pits 1d are provided on the substrate 1. When there are three protrusions 3c, as compared with, for example, two protrusions 3c, since the substrate 1 is stably fixed, the circumferential width of the protrusions 3c can be shortened. Since the width of the protrusion 3c is shortened, the width of the dimple 1d in the circumferential direction can be correspondingly shortened, so that the component mounting area of the substrate 1 can be widened.

On the upper side of FIG. 2, it shows the dimple 1 d and the protrusion 3 c viewed from the axial direction extending from the central axis AX. The lower side of FIG. 2 shows the protrusion 3c viewed from the substrate peripheral portion 1c side of the substrate 1. The wall surface 10 constituting the dimple 1d includes a first positioning surface 1d1 and a second positioning surface 1d2.

The first positioning surface 1d1 is a positioning surface that determines the position of the substrate 1 in the circumferential direction by contact with the first end surface 3c1 of the protrusion 3c in the circumferential direction. Since the first end surface 3c1 of the protrusion 3c is in contact with the first positioning surface 1d1, the movement of the substrate 1 in the circumferential direction is suppressed. Moreover, in the second figure, although the first end surface 3c1 of the protrusion 3c is in contact with the first positioning surface 1d1 of the recess 1d, as long as either one of the first end surface 3c1 and the second end surface 3c2 of the protrusion 3c is in contact with the concave structure The contact of the wall surface 10 of the pit 1d can suppress the movement of the substrate 1 in the circumferential direction. Therefore, the second end surface 3c2 of the protrusion 3c may be in contact with the end surface of the wall surface 10 constituting the recess 1d on the opposite side to the first positioning surface 1d1 in the circumferential direction. The second end surface 3c2 is an end surface on the opposite side to the first end surface 3c1 of the protrusion 3c.

The second positioning surface 1d2 is a positioning surface that determines the position of the substrate 1 in the radial direction by contact with the inner side surface 3c3 of the protrusion 3c in the radial direction. Since the inner side surface 3c3 of the protrusion 3c is in contact with the second positioning surface 1d2, the movement of the substrate 1 in the radial direction is suppressed.

An adhesive 11 as a fixing member is provided in the gap a between the surface 10A facing the second end surface 3c2 of the protrusion 3c and the second end surface 3c2 of the protrusion 3c in the wall surface 10 constituting the recess 1d. The gap a is a space formed between the wall surface 10 constituting the recess 1d and the second end surface 3c2 of the protrusion 3c in order to provide the adhesive 11. By providing the adhesive 11 in the gap a, the substrate 1 is connected to the second end surface 3c2 of the protrusion 3c via the adhesive 11. Therefore, the substrate 1 in the state where positioning has been performed is fixed to the substrate fixing portion 3.

In addition, according to the encoder 100 of the first embodiment, since the gap a for providing the adhesive 11 is formed in the fitting portion where the protrusion 3c fits with the substrate 1, it is not necessary to provide the substrate 1 for filling and bonding Plural through holes of the agent 11. In addition, it is not necessary to provide a plurality of holes for filling the adhesive 11 in the substrate fixing portion 3. Therefore, compared with the case where a plurality of through holes are formed in the substrate 1, the element mounting area of the substrate 1 becomes larger, and the mounting area of the pattern wiring on the substrate 1 can be increased. In addition, since it is not necessary to provide a plurality of holes for filling the adhesive 11 in the substrate fixing portion 3, the diameter of the substrate fixing portion 3 can be reduced accordingly, and the overall encoder 100 can be miniaturized.

Furthermore, by using the adhesive 11 with a low viscosity, the adhesive 11 can be prevented from dripping onto the electronic component 2 of the substrate 1 when the adhesive 11 is filled. In addition, in order to prevent the adhesive 11 from dripping onto the electronic component 2, a UV (UltraViolet) hardening type adhesive can be used. The so-called UV-curable adhesive is an adhesive formed by resin hardened by ultraviolet irradiation.

In addition, the protrusion 3c may be configured such that the axial height H is equal to the thickness T of the substrate 1 in the axial direction, or may be configured such that the axial height H is higher than the thickness T of the substrate 1 in the axial direction. The height H of the protrusion 3c in the axial direction is equal to the width in the axial direction from the end portion 3a of the substrate fixing portion 3 to the front end portion 3c4 of the protrusion 3c. The thickness T of the substrate 1 in the axial direction is equal to the width in the axial direction from the first substrate surface 1a to the second substrate surface 1b. When the height H of the protrusion 3c in the axial direction is configured to be higher than the thickness T of the substrate 1 in the axial direction, as shown in FIG. 2, it is preferable to apply the adhesive 11 also to the second end surface 3c2 of the protrusion 3c The portion protruding from the second substrate surface 1b of the substrate 1. By applying the adhesive 11 in this way, the area where the adhesive 11 is applied to the protrusion 3c will be increased as compared with the case where the height H of the protrusion 3c in the axial direction is equal to the thickness T of the substrate 1 in the axial direction. Therefore, the substrate 1 can be more firmly fixed to the substrate fixing portion 3.

In addition, the adhesive 11 may be provided between the end 3 a of the substrate fixing portion 3 and the substrate 1. By providing the adhesive 11 between the end portion 3a of the substrate fixing portion 3 and the substrate 1, the substrate 1 can be more than the case where the adhesive 11 is not provided between the end portion 3a of the substrate fixing portion 3 and the substrate 1 It is firmly fixed to the substrate fixing portion 3.

In addition, in the encoder 100 of the first embodiment, although the fitting structure of three projections 3c shown in FIG. 2 and the dimples 1d of the substrate 1 is used, the configuration example of the encoder 100 is not limited to this. For example, two of the three fitting structures may be replaced with the first end surface 3c1 of the protrusion 3c and the recess 1d at one end in the circumferential direction, so that the second end surface 3c2 of the protrusion 3c and the recess 1d A fitting structure that contacts the other end in the circumferential direction. When configured in this way, compared with the case where three fitting structures shown in FIG. 2 are used, the component mounting area of the substrate 1 can be enlarged, and the mounting area of the pattern wiring on the substrate 1 can be enlarged.

FIG. 3 is a diagram showing a substrate provided on the encoder of the first modification of the first embodiment. Figure 4 is a cross-sectional view of the IV-IV arrow shown in Figure 3. The substrate 1A shown in FIGS. 3 and 4 is provided with pits 1dA instead of the pits 1d. The dimple 1dA is formed in a shape in which the width of the wall surface 10 constituting the dimple 1dA in the circumferential direction is gradually narrowed radially inward. The first end surface 3c1 of the protrusion 3c is in contact with the first positioning surface 1d1 of the recess 1dA. A part of the inner surface 3c3 of the protrusion 3c is in contact with the second positioning surface 1d2 of the recess 1dA.

The adhesive 11 is provided in the gap a1 between the surface 10A and the second end surface 3c2, and is provided in the gap a2 between the surface 10B and the non-contact surface 3c3A. The surface 10A is a surface facing the second end surface 3c2 of the protrusion 3c in the wall surface 10 constituting the recess 1dA. The non-contact surface 3c3A is a surface of the inner side surface 3c3 of the protrusion 3c that is not in contact with the second positioning surface 1d2 of the recess 1dA. The surface 10B is a surface facing the non-contact surface 3c3A of the wall surface 10 constituting the recess 1dA.

By using the substrate 1A shown in FIGS. 3 and 4, the area of the wall surface 10 constituting the pit 1dA is larger than the area of the wall surface 10 constituting the pit 1d shown in FIG. 2, so the adhesive 11 is increased The coating area applied on the substrate 1A, and the adhesive 11 is not easily peeled off from the substrate 1A. In addition, since the adhesive 11 is also in contact with a part of the inner surface 3c3 of the protrusion 3c, the adhesive 11 is not easily peeled off from the protrusion 3c. Therefore, the substrate 1A can be more firmly fixed to the substrate fixing portion 3.

FIG. 5 is a diagram showing a substrate of an encoder provided in a second modification of the first embodiment. A pit 1 dB is formed in the substrate 1B shown in FIG. 5. The pit 1dB is formed in a shape in which the width in the circumferential direction of the wall surface 10 constituting the pit 1dB gradually narrows toward the radially inner side. In the recess 1 dB, a recess 40 is formed at the center of the second positioning surface 1d2 in the circumferential direction. The recess 40 is a recess recessed radially inward. The first end surface 3c1 of the protrusion 3c is in contact with the first positioning surface 1d1 of the recess 1dB. A part of the inner surface 3c3 of the protrusion 3c is in contact with the second positioning surface 1d2 of the recess 1dB. The second end surface 3c2 of the protrusion 3c is in contact with the third positioning surface 1d3. The third positioning surface 1d3 is a surface on the opposite side to the first positioning surface 1d1 in the circumferential direction of the wall surface 10 constituting the recess 1dB. The adhesive 11 is provided in the gap a between the wall surface 40A forming the recess 40 and the inner side surface 3c3.

By using the substrate 1B shown in FIG. 5, the third positioning surface 1d3 of the recess 1dB is brought into contact with the second end surface 3c2 of the protrusion 3c, so when the substrate 1B is mounted on the substrate fixing portion 3, the substrate can be suppressed 1B The filling operation is performed on the concave portion 40 in a state of moving clockwise and counterclockwise. Therefore, the adhesive 11 can be filled without worrying about the deviation of the substrate 1B in the circumferential direction, and the assembly work time of the encoder 100 can be shortened.

Fig. 6 is a diagram showing protrusions provided on an encoder according to a third modification of the first embodiment. In the protrusion 3cA shown in FIG. 6, a recess 50 is formed in the center of the inner surface 3c3 of the protrusion 3cA in the circumferential direction. The concave portion 50 is a concave recessed outward in the radial direction. The first end surface 3c1 is in contact with the first positioning surface 1d1. The inner surface 3c3 of the protrusion 3cA is in contact with the second positioning surface 1d2. The second end surface 3c2 of the protrusion 3cA is in contact with the third positioning surface 1d3 of the recess 1d. The adhesive 11 is provided in the gap a between the wall surface 50A constituting the recess 50 and the second positioning surface 1d2.

Since the third positioning surface 1d3 of the recess 1d is brought into contact with the second end surface 3c2 of the projection 3cA by using the projection 3cA shown in FIG. 6, when the substrate 1 is mounted on the substrate fixing portion 3, the substrate can be suppressed 1 Carry out the filling operation to the recess 50 in a state of moving clockwise and counterclockwise. Therefore, the adhesive mixture 11 can be filled without worrying about the displacement of the substrate 1 in the circumferential direction, and the assembly work time of the encoder 100 can be shortened.

FIG. 7 is a diagram showing protrusions provided on an encoder according to a fourth modification of the first embodiment. The protrusion 3cB shown in FIG. 7 is formed in a shape in which the width in the circumferential direction gradually narrows toward the radially inner side. The first end surface 3c1 of the protrusion 3cB is in contact with the first positioning surface 1d1 of the recess 1d. A part of the inner surface 3c3 of the protrusion 3cB is in contact with the second positioning surface 1d2 of the recess 1d.

The adhesive 11 is provided in the gap a1 between the surface 10A and the second end surface 3c2, and in the gap a2 between the surface 10B and the non-contact surface 3c3A. The surface 10A is a surface facing the second end surface 3c2 of the protrusion 3cB in the wall surface 10 constituting the recess 1d. The non-contact surface 3c3A is a surface of the inner side surface 3c3 of the protrusion 3cB that is not in contact with the second positioning surface 1d2 of the recess 1d. The surface 10B is a surface facing the non-contact surface 3c3A of the wall surface 10 constituting the recess 1d.

By using the protrusion 3cB shown in FIG. 7, the contact area of the adhesive 11 on the protrusion 3cB is larger than the contact area of the adhesive 11 on the protrusion 3c shown in FIG. 2, so the adhesive 11 is not easily peeled off from the protrusion 3cB . Therefore, the substrate 1 can be more firmly fixed to the substrate fixing portion 3.

FIG. 8 is a diagram showing a modification of the fitting structure of the substrate and three protrusions shown in FIG. 2. In the encoder 100 shown in FIG. 8, the first end surface 3c1 of the first protrusion 3c-1 among the three protrusions corresponds to the first pit corresponding to the first protrusion 3c-1 among the three pits The first positioning surface 1d1 of 1d-1 contacts. In addition, in the encoder 100 shown in FIG. 8, the second end surface 3c2 of the second protrusion 3c-2 of the three protrusions corresponds to the second end of the three protrusions corresponding to the second protrusion 3c-2 The third positioning surface 1d3 of the recess 1d-2 contacts. In the encoder 100 shown in FIG. 8, the adhesive 11 is provided at positions facing the first end face 3c1 and the second end face 3c2 of the third protrusion 3c-3, respectively.

According to the encoder 100 shown in FIG. 8, in a state where the movement of the substrate 1 in the clockwise and counterclockwise directions is suppressed by the first protrusion 3c-1 and the second protrusion 3c-2, the adhesive 11 can be implemented Of filling operations. Therefore, the adhesive 11 can be filled without worrying about the deviation of the substrate 1 in the circumferential direction, and the assembly work time of the encoder 100 can be shortened.

Fig. 9 is a diagram showing a modification example of the protrusion shown in Fig. 2. In the protrusion 300 shown in FIG. 9, a slope 70 is formed at the front end in the axial direction. The inclined surface 70 has a function of guiding the substrate peripheral portion 1 c of the substrate 1 toward the radial center of the substrate fixing portion 3. By providing the inclined surface 70, when the substrate 1 is inserted into the space surrounded by the three projections 3c, the substrate 1 is less likely to be caught by the front end portion of the projection 3c, and the assembly work of the encoder 100 can be facilitated. [Second Embodiment Type]

Fig. 10 is an external view of a servo motor of a second embodiment. The servo motor 200 shown in FIG. 10 is, for example, a machine tool used in a machining center, an NC lathe, a laser processing machine, an electrical discharge machining machine, or the like. The servo motor 200 includes a motor 150 and the encoder 100 of the first embodiment. The motor 150 includes an outer box 301, a bracket 8 provided at an end of the outer box 301, a rotor (not shown) provided inside the outer box 301, and a rotating shaft 302 provided in the rotor. For the servo motor 200, since the first real-type encoder 100 is used, the diameters of the substrate fixing portion 3 and the substrate 1 will become smaller, and the diameter of the cover 5 will be reduced accordingly, so that the entire servo motor can be further sought 200 is more compact.

Furthermore, in the present embodiment, although the adhesive 11 is used as a fixing member for the protrusion 3c of the substrate 1, the fixing member is not limited to the adhesive 11, as long as the fixing member is a member capable of fixing the protrusion 3c to the substrate 1 However, for example, it may be solder that significantly changes the viscosity by heat, or an elastic body such as a spring or rubber that changes shape by applying an external force.

The structure shown in the above embodiment is an example showing the contents of the present invention, and can also be combined with other conventional technologies, and a part of the structure can be omitted or changed without departing from the scope of the present invention. .

1. 1A, 1B‧‧‧ substrate 1a‧‧‧The first substrate surface 1b‧‧‧Second substrate surface 1c‧‧‧Outer part of substrate 1d, 1dA, 1dB‧‧‧Pit 1d1‧‧‧First positioning surface 1d2‧‧‧Second positioning surface 1d3‧‧‧third positioning surface 1d-1‧‧‧The first pit 1d-2‧‧‧The second pit 1d-3‧‧‧The third pit 2‧‧‧Electronic components 3‧‧‧Board fixing part 3a‧‧‧End 3b‧‧‧Outside 3c, 3cA, 3cB, 300 ‧‧‧ protrusion 3c-1‧‧‧The first protrusion 3c-2‧‧‧Second protrusion 3c-3‧‧‧The third protrusion 3c1‧‧‧1st end face 3c2‧‧‧2nd end face 3c3‧‧‧Inner side 3c3A‧‧‧non-contact surface 3c4‧‧‧ Front end 5‧‧‧cover 5a‧‧‧Bottom 5b‧‧‧Cylinder 7‧‧‧screw 8‧‧‧Bracket 10, 40A, 50A‧‧‧wall 10A, 10B‧‧‧surface 11‧‧‧ Adhesive 31‧‧‧ Corner 40, 50‧‧‧recess 70‧‧‧Bevel 100‧‧‧Encoder 150‧‧‧Motor 200‧‧‧Servo motor 301‧‧‧Outer box 302‧‧‧spindle a, a1, a2‧‧‧ gap H‧‧‧ Height T‧‧‧thickness

Fig. 1 is a perspective view of an encoder according to a first embodiment of the present invention. Figure 2 is an enlarged view of the pits and protrusions shown in Figure 1. FIG. 3 is a diagram showing the substrate of the encoder provided in the first modification of the first embodiment. Figure 4 is a cross-sectional view of the IV-IV arrow shown in Figure 3. FIG. 5 is a diagram showing a substrate provided on an encoder according to a second modification of the first embodiment. Fig. 6 is a diagram showing protrusions provided on an encoder according to a third modification of the first embodiment. FIG. 7 is a diagram showing protrusions provided on an encoder according to a fourth modification of the first embodiment. FIG. 8 is a diagram showing a modification of the fitting structure of the substrate and three protrusions shown in FIG. 2. Fig. 9 is a diagram showing a modification example of the protrusion shown in Fig. 2. Fig. 10 is an external view of the servo motor of the second embodiment.

1‧‧‧ substrate

1a‧‧‧The first substrate surface

1b‧‧‧Second substrate surface

1c‧‧‧Outer part of substrate

1d‧‧‧Pit

1d1‧‧‧First positioning surface

1d2‧‧‧Second positioning surface

3‧‧‧Board fixing part

3a‧‧‧End

3c‧‧‧protrusion

3c1‧‧‧1st end face

3c2‧‧‧2nd end face

3c3‧‧‧Inner side

3c4‧‧‧ Front end

10‧‧‧wall

10A‧‧‧Surface

11‧‧‧ Adhesive

31‧‧‧ Corner

a‧‧‧Gap

H‧‧‧ Height

T‧‧‧thickness

Claims (13)

An encoder with: Cylindrical substrate fixing part; The protrusion is provided at a corner formed by an axial end portion of the substrate fixing portion and a peripheral portion of the substrate fixing portion, and extends from the corner portion to the axial direction; The substrate has: a substrate surface in contact with the end portion; and a pit formed in a peripheral portion of the substrate surrounding the substrate surface, recessed radially inward from the peripheral portion of the substrate to the substrate fixing portion for the protrusion to be embedded; and The fixing member is provided in the gap formed between the protrusion and the recess; Among them, the wall surface constituting the pit is provided with: The first positioning surface is in contact with any one of the first end surface of the protrusion protruding in the circumferential direction of the substrate fixing portion and the second end surface opposite to the first end surface to determine the circumferential position of the substrate; and The second positioning surface is in contact with the inner surface of the protrusion in the radial direction to determine the radial position of the substrate. The encoder as described in item 1 of the patent application scope, wherein the first end surface is in contact with the first positioning surface; the gap is formed in the second end surface and the wall surface constituting the recess and the second end surface Between facing faces. The encoder as described in item 1 of the patent application scope, wherein the pit is formed in a shape in which the width of the circumferential surface constituting the wall surface of the pit gradually decreases toward the radially inner side; The gap is formed between the second end face and the face opposite to the second end face of the wall surface forming the recess, And it is formed between the non-contact surface that is not in contact with the second positioning surface in the inner side surface and the surface that faces the non-contact surface in the wall surface that constitutes the recess. The encoder as described in item 1 of the patent application scope, wherein a concave portion recessed toward the inner side in the radial direction is formed on the second positioning surface; The second end surface is in contact with a third positioning surface provided on the side opposite to the first positioning surface in the circumferential direction of the wall surface constituting the recess; The gap is formed between the wall surface constituting the recess and the inner side surface. The encoder as described in item 1 of the patent application scope, wherein a concave portion is formed on the inner side surface which is recessed toward the outer side in the radial direction; The second end surface is in contact with a third positioning surface provided on the opposite side to the first positioning surface in the circumferential direction among the wall surfaces constituting the recess; The gap is formed between the wall surface constituting the recess and the second positioning surface. The encoder as described in item 1 of the patent application scope, wherein the protrusion is formed in a shape in which the width in the circumferential direction gradually decreases toward the inner side in the radial direction; The gap is formed between the second end surface and the surface facing the second end surface of the wall surface forming the recess, And it is formed between the non-contact surface that is not in contact with the second positioning surface in the inner side surface and the surface that faces the non-contact surface in the wall surface that constitutes the recess. The encoder as described in any one of claims 1 to 6, wherein three protrusions are provided on the substrate fixing portion; 3 of the protrusions are separated from each other in the circumferential direction; Three recesses corresponding to three protrusions are provided on the substrate; The three pits are separated from each other in the circumferential direction. The encoder as described in item 7 of the patent application range, wherein the first end face of the first protrusion among the three protrusions corresponds to the first pit corresponding to the first protrusion among the three pits The first positioning surface is in contact; The second end surface of the second protrusion among the three protrusions is a third positioning surface on the opposite side to the first positioning surface of the second recess corresponding to the second protrusion of the three recesses contact. The encoder according to any one of claims 1 to 6, wherein an inclined surface is formed at the axial front end of the protrusion, and the inclined surface is used to connect the peripheral portion of the substrate to the substrate fixing portion The radial center guide. The encoder as described in item 7 of the patent application scope, wherein a slope is formed at the front end of the protrusion in the axial direction, and the slope is used to guide the peripheral portion of the substrate toward the radial center of the substrate fixing portion . The encoder as described in item 8 of the patent application range, wherein a slope is formed at the front end of the protrusion in the axial direction, and the slope is used to guide the peripheral portion of the substrate toward the radial center of the substrate fixing portion . An encoder with: Cylindrical substrate fixing part; The protrusion is provided at a corner formed by an axial end portion of the substrate fixing portion and a peripheral portion of the substrate fixing portion, and extends from the corner portion to the axial direction; The substrate has: a substrate surface in contact with the end portion; and a pit formed in a peripheral portion of the substrate surrounding the substrate surface, recessed radially inward from the peripheral portion of the substrate to the substrate fixing portion for the protrusion to be embedded; and The fixing member is provided in the gap formed between the protrusion and the recess; Among them, the wall surface constituting the pit is provided with: The first positioning surface is in contact with any one of a first end surface of the protrusion protruding in the circumferential direction of the substrate fixing portion and a second end surface opposite to the first end surface; and The second positioning surface is in contact with the inner surface of the protrusion in the radial direction. A servo motor is equipped with the encoder described in any one of patent application items 1 to 12.

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