Miniature incremental encoder

Abstract

The present application relates to the field of encoders, and provides a miniature incremental encoder, including: a signal terminal body and a brush body, the side wall of the brush body is spaced apart with ball contacts, the signal terminal body is provided with a columnar receiving groove, the ball contact is arranged in the columnar receiving groove and point-contacts with the side wall of the columnar receiving groove, the side wall of the columnar receiving groove is spaced apart with signal terminals, and when the brush body rotates, the ball contact alternately point-contacts with the signal terminal for conduction. Since the ball contacts spaced apart on the brush body and the signal terminals spaced apart and embedded in the side wall of the columnar receiving groove are point-contacted, it is possible to avoid the precision error between the brush and the signal terminal after they are manufactured, which causes the deviation when the brush and the signal terminal are in contact, thereby improving the stability and accuracy of the output signal.

Description

Technical Field

[0001] The present application relates to the field of encoders, and in particular to a miniature incremental encoder. Background Art

[0002] An encoder is a mechanical rotating electrical signal generating device. It is an electronic component that directly converts the angular displacement of the rotation into a digital signal. An encoder is a device that compiles and converts signals or data into a signal form that can be used for communication, transmission and storage. It is mainly used in smart watches, Bluetooth headsets, Bluetooth speakers, game console control handles, drone remote controls and other fields. It has the characteristics of high frequency of use and high flexibility in operation.

[0003] The signal terminal of the existing micro incremental encoder is a disc structure, the brush and the signal terminal are end-face contact and conduction, and the end faces of the brush and the signal terminal are in line contact. Since both the brush and the signal terminal are metal stamping parts, they are constrained by the stamping process, which inevitably causes precision errors in the brush and the signal terminal after they are manufactured, causing deviations when the end faces of the brush and the signal terminal are in line contact, thereby affecting the stability and accuracy of the output signal. In addition, the area swept by the end faces of the brush and the signal terminal is a fan-shaped contact surface. As long as there is a slight deviation in the inner and outer contact areas of the fan-shaped contact surface, it will affect the stability and accuracy of the output signal.

[0004] In the Chinese invention patent application with application number "202210737085.6" and titled "A micro encoder with an incremental lateral drive structure", a micro encoder with an incremental lateral drive structure is disclosed, including a plastic base, a plastic positioning column is inserted into the interior of the plastic base, a stainless steel clip spring is sleeved on the outside of the plastic positioning column, and the stainless steel clip spring is located inside the plastic base, the plastic base is rotatably connected to a plastic gear handle, and a hardware contact spring is sleeved on the outside of the plastic gear handle, and the hardware contact spring is located inside the plastic base; the present invention solves the problem of the shielding wire on the data head being easy to loosen and fall off through the mutual cooperation and transmission between the reinforcement mechanism and the self-locking mechanism structure.

[0005] However, in the invention patent application, since the hardware terminal and the hardware contact spring cooperate with each other, the end surface line contact is still in the form, and there is also contact deviation caused by the line contact between the end surface of the hardware terminal and the hardware contact spring, thereby affecting the stability and accuracy of the output signal. Summary of the invention

[0006] In order to solve the problem that the brush of the existing micro incremental encoder generates deviation when in line contact with the end surface of the signal terminal, thereby affecting the stability and accuracy of the output signal, the present application provides a micro incremental encoder.

[0007] The micro incremental encoder provided in this application adopts the following technical solution:

[0008] A miniature incremental encoder comprises: a signal terminal body and a brush body, the side walls of the brush body are spaced apart with ball contacts, the signal terminal body is provided with a columnar receiving groove, the ball contacts are arranged in the columnar receiving groove and point-contact with the side walls of the columnar receiving groove, the side walls of the columnar receiving groove are inlaid with signal terminals at intervals, and when the brush body rotates, the ball contacts alternately point-contact with the signal terminals for conduction.

[0009] Therefore, the spherical contacts distributed at intervals on the brush body and the signal terminals embedded in the side walls of the columnar receiving grooves at intervals are in point contact with each other, which can avoid precision errors between the brush and the signal terminal after they are manufactured, resulting in deviations when the brush and the signal terminal are in contact, thereby improving the stability and accuracy of the output signal; in addition, the signal terminal is embedded in the side walls of the columnar receiving grooves, so that the brush body and the signal terminal body are in side contact and conduction, which subverts the traditional line contact and conduction method between the brush body and the end face of the signal terminal body, and the contact surface between the spherical contact and the signal terminal is a cylindrical surface, so there is no contact deviation, which can further improve the stability and accuracy of the output signal.

[0010] Preferably, the brush body includes a brush and a brush plastic body, the brush is fixed on the brush plastic body, the brush has extended arms extending obliquely outward along the side walls of the brush plastic body and are arranged at intervals, and the ball contacts are correspondingly arranged on the extended ends of the extended arms.

[0011] Therefore, the brush is provided with an extended support arm, and the ball contact is correspondingly arranged on the extended end of the extended support arm. The extended support arm can provide reliable lateral force for the ball contact, so that the ball contact can reliably contact and conduct with the signal terminal point.

[0012] Preferably, the brush comprises a base body and the extending arms, the extending arms are fixedly connected to the base body, the extending arms are equally spaced along the side wall of the base body, and the base body is fixed on the brush plastic package.

[0013] Preferably, the signal terminal body comprises a signal terminal plastic package, the middle portion of which is recessed inward to form the columnar receiving groove, the brush body is entirely disposed in the columnar receiving groove, and the signal terminal is entirely plastic-coated in the signal terminal plastic package.

[0014] Therefore, by disposing the brush body as a whole in the columnar receiving groove, the volume of the encoder can be reduced, the structure of the encoder can be made more compact, and the miniaturization of the encoder can be achieved.

[0015] Preferably, the signal terminal includes an A-pin terminal, a B-pin terminal and a C-pin terminal, and the A-pin terminal, the B-pin terminal and the C-pin terminal are all arranged along the contour of the cylindrical side wall of the columnar receiving groove, wherein the A-pin terminal is provided with a plurality of equally divided and alternately arranged first contact pillars and a first notch, the B-pin terminal is provided with a plurality of equally divided and alternately arranged second contact pillars and a second notch, and the C-pin terminal is in the shape of an overall strip; the side walls of the columnar receiving groove are respectively provided with an A-pin terminal inlay groove, a B-pin terminal inlay groove and a C-pin terminal inlay groove that match the shapes of the A-pin terminal, the B-pin terminal and the C-pin terminal.

[0016] Therefore, the A-pin terminal, the B-pin terminal and the C-pin terminal are all arranged along the cylindrical side wall contour of the columnar receiving groove, so that the contact surfaces of the A-pin terminal, the B-pin terminal and the C-pin terminal with the ball contact are all cylindrical surfaces; the A-pin terminal is provided with a plurality of equally divided and alternately arranged first contact columns and a first notch, and the B-pin terminal is provided with a plurality of equally divided and alternately arranged second contact columns and a second notch, which can realize multi-regular coding signal output.

[0017] Preferably, the A-pin terminal, B-pin terminal and C-pin terminal are respectively provided with an A-pin terminal pin, a B-pin terminal pin and a C-pin terminal pin, and the A-pin terminal pin, the B-pin terminal pin and the C-pin terminal pin are all arranged in the signal terminal plastic package, and one end extends out from the signal terminal plastic package.

[0018] Therefore, the A-pin terminal pin, the B-pin terminal pin and the C-pin terminal pin can be connected to external devices to facilitate the output of the encoding signal.

[0019] Preferably, it also includes a positioning rotor, which is coaxially fixedly connected to the brush body, and a shaft hole is provided through the middle of the positioning rotor and the brush body; a positioning plate is provided on the end surface of the positioning rotor away from the brush body, and a plurality of positioning teeth and grooves are distributed circumferentially on the positioning plate.

[0020] Therefore, a shaft hole is provided on the positioning rotor, and the shaft can be inserted into the shaft hole. The brush body is rotated by rotating the shaft, so that the ball contacts are alternately contacted with the signal terminal points to output the coded signal. The positioning disk is provided with a plurality of positioning teeth and grooves distributed in a circle, which can realize the positioning of the rotation of the positioning rotor.

[0021] Preferably, it further comprises a bracket, wherein the bracket comprises a top plate and side plates arranged around the top plate, the top plate and the side plates enclose a cavity, and the signal terminal body and the brush body are integrally arranged in the cavity.

[0022] Preferably, an elastic clamping body is provided on the top plate at a position close to the positioning disk, and the elastic clamping body is correspondingly clamped in the positioning tooth groove.

[0023] Therefore, the rotation of the positioning rotor is positioned by correspondingly engaging the elastic engaging body in the positioning tooth groove.

[0024] Preferably, it also includes a switch terminal body, which is arranged on a side of the signal terminal body away from the brush body, and the switch terminal body includes a switch terminal overmolding body and a switch terminal, and the switch terminal is integrally injection-molded on the switch terminal overmolding body.

[0025] Therefore, the on / off function of the application equipment can be realized through the switch terminal body.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. Since the spherical contacts distributed at intervals on the brush body and the signal terminals embedded in the side walls of the columnar receiving grooves are in point contact, the precision error between the brush and the signal terminal after manufacturing can be avoided, which causes the deviation when the brush and the signal terminal contact, thereby improving the stability and accuracy of the output signal.

[0028] 2. Since the signal terminal is embedded in the side wall of the columnar receiving groove, the brush body and the signal terminal body are in side contact and conduction, which subverts the traditional way of end face contact and conduction between the brush body and the signal terminal body. In addition, the contact surface between the ball contact and the signal terminal is a cylindrical surface, and there is no contact deviation, which can further improve the stability and accuracy of the output signal.

[0029] 3. Since the A-pin terminal, the B-pin terminal and the C-pin terminal are all arranged along the cylindrical side wall contour of the columnar receiving groove, the contact surfaces of the A-pin terminal, the B-pin terminal and the C-pin terminal with the ball contact are all cylindrical surfaces; the A-pin terminal is provided with a plurality of equally divided and alternately arranged first contact columns and a first notch, and the B-pin terminal is provided with a plurality of equally divided and alternately arranged second contact columns and a second notch, which can realize multi-regular coding signal output. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the micro incremental encoder of the present application.

[0031] Figure 2 It is a schematic diagram of the exploded view of the micro incremental encoder of the present application.

[0032] Figure 3 It is a schematic diagram of the structure of the signal terminal plastic package of the micro incremental encoder of the present application.

[0033] Figure 4 It is a schematic diagram of the structure of the A-pin terminal of the micro incremental encoder of the present application.

[0034] Figure 5It is a schematic diagram of the structure of the B-pin terminal of the micro incremental encoder of the present application.

[0035] Figure 6 It is a schematic diagram of the mechanism of the C-pin terminal of the micro incremental encoder of the present application.

[0036] Description of reference numerals: 1, signal terminal body; 10, columnar receiving groove; 11, signal terminal plastic package; 111, A-pin terminal embedding groove; 112, B-pin terminal embedding groove; 113, C-pin terminal embedding groove; 12, A-pin terminal; 121, first contact column; 122, first notch; 123, A-pin terminal pin; 13, B-pin terminal; 131, second contact column; 132, second notch; 133, B-pin terminal pin; 14. C-foot terminal; 141. C-foot terminal pin; 2. Brush body; 21. Brush; 211. Seat; 212. Extended arm; 213. Ball contact; 22. Brush plastic package; 3. Positioning rotor; 31. Shaft hole; 32. Positioning plate; 33. Positioning tooth groove; 4. Bracket; 41. Top plate; 42. Side plate; 43. Elastic snap-on body; 5. Switch terminal body; 51. Switch terminal plastic package; 52. Switch terminal. DETAILED DESCRIPTION

[0037] The following is combined with Figures 1 to 6 This application is described in further detail.

[0038] Combination Figure 1 and Figure 2 As shown, the micro incremental encoder disclosed in the embodiment of the present application includes: a signal terminal body 1 and a brush body 2, the side walls of the brush body 2 are spaced apart with ball contacts 213, a columnar receiving groove 10 is provided on the signal terminal body 1, the columnar receiving groove 10 is cylindrical, and the side walls of the columnar receiving groove 10 are cylindrical surfaces, the ball contacts 213 are arranged in the columnar receiving groove 10 and point-contact with the side walls of the columnar receiving groove 10, signal terminals are inlaid on the side walls of the columnar receiving groove 10 at intervals, the signal terminals are exposed from the side walls of the columnar receiving groove 10, the exposed parts are similar in shape to the cylindrical surfaces of the side walls of the columnar receiving groove 10, forming a complete cylindrical surface, and when the brush body 2 rotates, the ball contacts 213 alternately point-contact with the signal terminals to be conducted, thereby outputting a coded signal.

[0039] Since the ball contact 213 and the signal terminal are in point contact, the distance between the contact point between the ball contact 213 and the signal terminal and the rotation center of the brush body 2 is always kept constant, and there is no sudden change in the contact point position. Therefore, it will not be affected by process errors. It can avoid precision errors between the brush body 2 and the signal terminal after manufacturing, which will cause deviations when the brush body 2 contacts the signal terminal, thereby improving the stability and accuracy of the output signal.

[0040] In addition, the signal terminal is embedded in the side wall of the columnar receiving groove 10, so that the brush body 2 and the signal terminal body 1 are in side contact and conduction, which subverts the traditional way of end line contact and conduction between the brush body 2 and the signal terminal body 1, and the contact surface between the ball contact 213 and the signal terminal is a cylindrical surface, which also ensures that the distance between the contact point of the ball contact 213 and the signal terminal and the rotation center of the brush body 2 always remains constant, and there is no contact deviation, which can further improve the stability and accuracy of the output signal.

[0041] like Figure 2 As shown, the brush body 2 includes a brush 21 and a brush plastic package 22. The brush 21 is made of hardware stamping, and the brush plastic package 22 is made of plastic. The brush 21 and the brush plastic package 22 can be integrally formed by injection molding, or the brush 21 can be fixed to the brush plastic package 22 by fasteners. The brush 21 is provided with extension arms 212 extending outwardly along the side wall of the brush plastic package 22 and spaced apart, and the ball contacts 213 are correspondingly arranged on the extension ends of the extension arms 212.

[0042] More specifically, the brush 21 includes a base body 211 and an extension arm 212. The extension arm 212 is fixedly connected to the base body 211 and can be integrally stamped by hardware or fixedly connected by fasteners. The extension arm 212 is evenly spaced along the side wall of the base body 211, and the base body 211 is fixed on the brush plastic body 22.

[0043] Since the brush 21 is provided with an extension arm 212, the ball contact 213 is correspondingly arranged on the extension end of the extension arm 212. The extension arm 212 extends outward at an angle and has a tendency to return to its original shape when squeezed. Therefore, a reliable lateral force can be provided for the ball contact 213, so that the ball contact 213 can reliably contact and conduct with the signal terminal point.

[0044] like Figure 3 As shown, the signal terminal body 1 includes a signal terminal plastic package 11, which is made of plastic material by injection molding and has good insulation. The middle part of the signal terminal plastic package 11 is recessed inward to form a columnar receiving groove 10. The signal terminal is made by integrally stamping hardware. The signal terminal and the signal terminal plastic package 11 can be integrally molded by injection molding so that the signal terminal is integrally molded in the signal terminal plastic package 11. The brush body 2 is arranged as a whole in the columnar receiving groove 10, thereby reducing the volume of the encoder, making the structure of the encoder more compact, and realizing the miniaturization of the encoder.

[0045] Combination Figures 3 to 6As shown, the signal terminal includes an A-pin terminal 12, a B-pin terminal 13 and a C-pin terminal 14, wherein the C-pin terminal 14 is a common pin, the A-pin terminal 12 and the C-pin terminal 14 are combined to form an AC signal output pin, outputting an AC signal, and the B-pin terminal 13 and the C-pin terminal 14 are combined to form a BC signal output pin, outputting an output BC signal. The exposed portions of the A-pin terminal 12, the B-pin terminal 13 and the C-pin terminal 14 on the side wall of the columnar receiving groove 10 are all arranged along the contour of the cylindrical side wall of the columnar receiving groove 10, so that the A-pin terminal 12, the B-pin terminal 13 and the C-pin terminal 14 form a complete cylindrical surface with the side wall of the columnar receiving groove 10. The contact surfaces of the A-pin terminal 12, the B-pin terminal 13 and the C-pin terminal 14 with the ball contact 213 are all cylindrical surfaces, ensuring that the distance between the contact points of the ball contact 213 and the A-pin terminal 12, the B-pin terminal 13 and the C-pin terminal 14 and the rotation center of the brush body 2 always remains constant, and there is no sudden change in the contact point position, thereby improving the stability and accuracy of the output signal.

[0046] The A-pin terminal 12 is provided with a plurality of equally spaced and alternately arranged first contact pillars 121 and a first notch 122, the B-pin terminal 13 is provided with a plurality of equally spaced and alternately arranged second contact pillars 131 and a second notch 132, and the C-pin terminal 14 is in the shape of an entire belt. The side walls of the columnar receiving groove 10 are respectively provided with an A-pin terminal embedding groove 111, a B-pin terminal embedding groove 112, and a C-pin terminal embedding groove 113 that match the shapes of the A-pin terminal 12, the B-pin terminal 13, and the C-pin terminal 14.

[0047] Specifically, the A-pin terminal embedding groove 111 is provided with a first receiving groove matching the shape of the first contact column 121, and a first protrusion matching the shape of the first notch 122. The first contact column 121 is filled in the first receiving groove, and the first protrusion is filled in the first notch 122, forming a mutual fit. When the brush body 2 drives the ball contact 213 to rotate, the ball contact 213 is alternately contacted and abutted with the first contact column 121 and the first protrusion, respectively, to form a connection and disconnection with the A-pin terminal 12. Similarly, the B-pin terminal embedding groove 112 is provided with a second receiving groove matching the shape of the second contact column 131, and a second protrusion matching the shape of the second notch 132. The second contact column 131 is filled in the second receiving groove, and the second protrusion is filled in the second notch 132, forming a mutual fit. When the brush body 2 drives the ball contact 213 to rotate, the ball contact 213 is alternately contacted and abutted with the second contact column 131 and the second protrusion, respectively, to form a connection and disconnection with the B-pin terminal 13.

[0048] Since the A-pin terminal 12 is provided with a plurality of equally spaced and alternately arranged first contact columns 121 and first notches 122, and the B-pin terminal 13 is provided with a plurality of equally spaced and alternately arranged second contact columns 131 and second notches 132, the number of settings can be determined according to actual conditions, and multiple regular coding signal outputs can be realized.

[0049] The A-pin terminal 12, the B-pin terminal 13 and the C-pin terminal 14 are provided with an A-pin terminal pin 123, a B-pin terminal pin 133 and a C-pin terminal pin 141 respectively. The A-pin terminal pin 123, the B-pin terminal pin 133 and the C-pin terminal pin 141 are all arranged in the signal terminal plastic package 11, and one end thereof extends out from the signal terminal plastic package 11. The A-pin terminal pin 123, the B-pin terminal pin 133 and the C-pin terminal pin 141 are arranged in parallel and alternately, and are all located on the same side of the signal terminal plastic package 11. One end of the A-pin terminal pin 123, the B-pin terminal pin 133 and the C-pin terminal pin 141 extends out from the same side wall of the signal terminal plastic package 11. The A-pin terminal pin 123, the B-pin terminal pin 133 and the C-pin terminal pin 141 can be connected to an external device to facilitate the output of the coded signal.

[0050] like Figure 2 As shown, the micro incremental encoder of this embodiment also includes a positioning rotor 3, which is integrally injection-molded from a plastic material. The positioning rotor 3 is coaxially fixedly connected to the brush body 2. A shaft hole 31 is provided through the middle of the positioning rotor 3 and the brush body 2. The shaft can be inserted into the shaft hole 31, and the brush body 2 is rotated by rotating the shaft to make the ball contact 213 alternately contact and conduct with the signal terminal point to output a coding signal. A positioning plate 32 is provided on the end face of the positioning rotor 3 away from the brush body 2, and a plurality of positioning tooth grooves 33 are provided on the positioning plate 32 in a circumferential distribution, so as to realize the positioning of the rotation of the positioning rotor 3.

[0051] The micro incremental encoder of this embodiment also includes a bracket 4, which is stamped integrally from hardware. The bracket 4 includes a top plate 41 and a side plate 42 arranged around the top plate 41. The top plate 41 and the side plate 42 form a cavity. The signal terminal body 1 and the brush body 2 are arranged as a whole in the cavity. The bracket 4 forms a protective shell for the signal terminal body 1 and the brush body 2, and protects the signal terminal body 1 and the brush body 2.

[0052] An elastic clamping body 43 is provided on the top plate 41 of the bracket 4 near the positioning disk 32. The elastic clamping body 43 is correspondingly clamped in the positioning tooth groove 33. When the positioning rotor 3 rotates, the elastic clamping body 43 alternately slides out and clamps in different positioning tooth grooves 33, and is clamped with the positioning tooth groove 33 to position the rotation position of the positioning rotor 3. The elastic clamping body 43 can be a cantilever stamped out from the top plate 41 of the bracket 4, and a bent portion that cooperates with the positioning tooth is stamped on the free end of the cantilever. When the cantilever is squeezed, a restoring force is generated, so that the bent portion always maintains a tendency to be clamped in the positioning tooth groove 33.

[0053] The elastic snap-in body 43 can also be formed by assembling a spring and an ejection block. A mounting hole can be set on the top plate 41 of the bracket 4, and the elastic snap-in body 43 is set in the mounting hole. The spring is compressed in the mounting hole, and the ejection block is ejected from the mounting hole by the spring and is snapped into the positioning tooth groove 33.

[0054] Combination Figure 1 and Figure 2 As shown, the micro incremental encoder of this embodiment also includes a switch terminal body 5, which is arranged on the side of the signal terminal body 1 away from the brush body 2. A hook is provided on the end of the side plate 42 of the bracket 4 close to the switch terminal body 5 to clamp and fix the switch terminal body 5. The switch terminal body 5 includes a switch terminal plastic package 51 and a switch terminal 52. The switch terminal 52 is integrally injection molded on the switch terminal plastic package 51, and the switch terminal body 5 can be used to realize the power on and off function of the application equipment.

[0055] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A micro incremental encoder, characterized in that: include: A signal terminal body (1) and a brush body (2), wherein the side walls of the brush body (2) are spaced apart with ball contacts (213), the signal terminal body (1) is provided with a columnar receiving groove (10), the ball contacts (213) are arranged in the columnar receiving groove (10) and are in point contact with the side walls of the columnar receiving groove (10), the side walls of the columnar receiving groove (10) are spaced apart with signal terminals, and when the brush body (2) rotates, the ball contacts (213) are alternately in point contact with the signal terminals to achieve conduction.

2. The micro incremental encoder according to claim 1, characterized in that: The brush body (2) comprises a brush (21) and a brush plastic body (22), wherein the brush (21) is fixed on the brush plastic body (22), and the brush (21) is provided with extension arms (212) extending outwardly along the side wall of the brush plastic body (22) and arranged at intervals, and the ball contact (213) is correspondingly arranged on the extension end of the extension arm (212).

3. The micro incremental encoder according to claim 2, characterized in that: The brush (21) comprises a base body (211) and an extension arm (212), wherein the extension arm (212) is fixedly connected to the base body (211), the extension arm (212) is arranged at equal intervals along the side wall of the base body (211), and the base body (211) is fixed on the brush plastic package (22).

4. The micro incremental encoder according to claim 1, characterized in that: The signal terminal body (1) comprises a signal terminal plastic package (11), the middle portion of the signal terminal plastic package (11) is recessed inward to form the columnar receiving groove (10), the brush body (2) is entirely disposed in the columnar receiving groove (10), and the signal terminal is entirely plastic packaged in the signal terminal plastic package (11).

5. The micro incremental encoder according to claim 1 or 4, characterized in that: The signal terminal comprises an A-pin terminal (12), a B-pin terminal (13) and a C-pin terminal (14), wherein the A-pin terminal (12), the B-pin terminal (13) and the C-pin terminal (14) are all arranged along the cylindrical side wall contour of the columnar receiving groove (10), wherein the A-pin terminal (12) is provided with a plurality of first contact pillars (121) and a first notch (122) which are equally spaced and arranged alternately, the B-pin terminal (13) is provided with a plurality of second contact pillars (131) and a second notch (132) which are equally spaced and arranged alternately, and the C-pin terminal (14) is in the shape of an entire belt; and the side walls of the columnar receiving groove (10) are respectively provided with an A-pin terminal embedding groove (111), a B-pin terminal embedding groove (112) and a C-pin terminal embedding groove (113) which are matched in shape with the A-pin terminal (12), the B-pin terminal (13) and the C-pin terminal (14).

6. The micro incremental encoder according to claim 5, characterized in that: The A-pin terminal (12), the B-pin terminal (13) and the C-pin terminal (14) are respectively provided with an A-pin terminal pin (123), a B-pin terminal pin (133) and a C-pin terminal pin (141); the A-pin terminal pin (123), the B-pin terminal pin (133) and the C-pin terminal pin (141) are all arranged in the signal terminal plastic package (11), and one end thereof extends out from the signal terminal plastic package (11).

7. The micro incremental encoder according to claim 1, characterized in that: The brush body (2) further comprises a positioning rotor (3), the positioning rotor (3) being coaxially fixedly connected to the brush body (2), a rotating shaft hole (31) being provided through the middle of the positioning rotor (3) and the brush body (2); a positioning disc (32) being provided on the end surface of the positioning rotor (3) away from the brush body (2), and a plurality of positioning tooth grooves (33) being provided on the positioning disc (32) in a circumferentially distributed manner.

8. The micro incremental encoder according to claim 7, characterized in that: The invention also comprises a bracket (4), wherein the bracket (4) comprises a top plate (41) and a side plate (42) arranged around the top plate (41), wherein the top plate (41) and the side plate (42) enclose a cavity, and the signal terminal body (1) and the brush body (2) are arranged as a whole in the cavity.

9. The micro incremental encoder according to claim 8, characterized in that: An elastic clamping body (43) is provided on the top plate (41) at a position close to the positioning disk (32), and the elastic clamping body (43) is correspondingly clamped in the positioning tooth groove (33).

10. The incremental encoder according to claim 1, characterized in that: It also comprises a switch terminal body (5), the switch terminal body (5) being arranged on a side of the signal terminal body (1) away from the brush body (2), the switch terminal body (5) comprising a switch terminal overmolding body (51) and a switch terminal (52), the switch terminal (52) being integrally injection-molded on the switch terminal overmolding body (51).

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