Magnet fixing member

Abstract

The present application can provide a thin magnet fixing member with versatility, which can easily and reliably fix a magnet to a rotation center portion of a pointer in a state where the center of the magnet coincides with the rotation center of the pointer. The magnet fixing member is a magnet fixing member that is fitted to a rotation center portion of a pointer of an analog meter for fixing a magnet for rotation angle detection, and includes a main body portion, a magnet holding portion provided on an upper surface of the main body portion to hold the magnet on the rotation center of the pointer, a slit portion formed in the main body portion into a planar shape orthogonal to the rotation center to accommodate the rotation center portion of the pointer, a rotation shaft holding portion provided on the main body portion on a lower side of the slit portion to hold a rotation shaft portion of the pointer, and a pointer restricting portion provided protruding outward from an outer peripheral edge portion of the main body portion to restrict rotation of the pointer relative to the main body portion.

Description

Technical Field

[0001] This invention relates to magnet fasteners. Background Technology

[0002] Patent Document 1 discloses a magnet holder that is mounted on the rotation center of a pointer of a pressure gauge to hold a magnet used to detect the rotation angle of the pointer.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Utility Model Registration No. 3161399 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] However, the magnet holder disclosed in Patent Document 1 has a protective cover on the upper side of the magnet, making it difficult to thin the magnet holder and impossible to install when the gap between the pressure gauge pointer and the transparent plate is narrow. In addition, the magnet holder disclosed in Patent Document 1 requires that the dimensions of each part match the pointer of a specific size, so it cannot be universally installed for pointers of various sizes.

[0008] Furthermore, the technology disclosed in Patent Document 1 requires a replacement transparent plate with the same shape as the pressure gauge's transparent plate, thus incurring additional costs for parts, molds, etc., for this replacement transparent plate. Additionally, the technology disclosed in Patent Document 1 requires preparing the replacement transparent plate according to the outer diameter of the instrument, making it difficult to easily handle various types of instruments with different outer diameters. Moreover, conventionally, a method of assembling a magnetic sensor at the center position of the analog instrument has been used to determine this position, but this method is time-consuming.

[0009] Solution for solving the problem

[0010] One embodiment of the magnet holder is a magnet holder that is mounted on the rotation center of a pointer of an analog instrument to fix a magnet used for detecting rotation angle. The magnet holder includes: a main body; a magnet holding part provided on the upper surface of the main body to hold the magnet at the rotation center of the pointer; a slit part formed in the main body as a plane orthogonal to the rotation center to accommodate the rotation center of the pointer; a rotation axis holding part provided on the lower side of the slit part in the main body to hold the rotation axis of the pointer; and a pointer limiting part provided protruding outward from the outer periphery of the main body to limit the rotation of the pointer relative to the main body.

[0011] Furthermore, one embodiment of the positioning device is a positioning device for positioning a sensor unit at the center of the surface of a generally circular and transparent protective cover member covering the display surface of an analog instrument. The positioning device includes: a pair of clamping members disposed opposite each other in a first direction to clamp the outer peripheral surface of the outer frame of the protective cover member; a rack disposed extending in the first direction to connect the pair of clamping members in a manner that allows adjustment of the separation distance between the pair of clamping members; a center block disposed on the back side of the protective cover member and disposed at the middle position of the pair of clamping members regardless of the separation distance between the pair of clamping members; and a positioning member disposed on the surface side of the protective cover member and disposed at the middle position of the pair of clamping members regardless of the separation distance between the pair of clamping members, holding the sensor unit and positioning the sensor unit at the center of the surface of the protective cover member.

[0012] Invention Effects

[0013] According to one embodiment, a versatile, thin magnet holder can be provided that can easily and reliably fix a magnet to the center of rotation of a pointer while aligning the center of the magnet with the center of rotation of the pointer.

[0014] Furthermore, according to one embodiment of the positioning device, the magnetic sensor can be easily positioned at the center of the instrument for various types of instruments with different outer diameters. Attached Figure Description

[0015] Figure 1 This is a perspective view of the magnet fastener according to the first embodiment.

[0016] Figure 2 This is a top view of the magnet fastener according to the first embodiment.

[0017] Figure 3 This is a side view of the magnet fastener according to the first embodiment.

[0018] Figure 4 This is a front view of the magnet fastener according to the first embodiment.

[0019] Figure 5 This is a bottom view of the magnet fastener according to the first embodiment.

[0020] Figure 6 This is a perspective sectional view showing the magnet fastener of the first embodiment based on the A-A section line.

[0021] Figure 7 This is an exploded perspective view of the structure according to the first embodiment.

[0022] Figure 8 This is a diagram illustrating the assembly method of the magnet fastener according to the first embodiment.

[0023] Figure 9 This is a diagram illustrating the assembly method of the magnet fastener according to the first embodiment.

[0024] Figure 10 This is a diagram illustrating the assembly method of the magnet according to the first embodiment.

[0025] Figure 11 This is a diagram illustrating the assembly method of the magnet according to the first embodiment.

[0026] Figure 12 for Figure 11 The diagram shows a cross-sectional view of the structure along line A-A.

[0027] Figure 13 This diagram illustrates the insertion action of the long needle portion of the pointer relative to the magnet fixing member of the first embodiment.

[0028] Figure 14 This diagram illustrates the insertion action of the long needle portion of the pointer relative to the magnet fixing member of the first embodiment.

[0029] Figure 15 This diagram illustrates a configuration example of the rotation angle detection system according to the first embodiment.

[0030] Figure 16 This is a perspective view of the positioning device as seen from above in the second embodiment.

[0031] Figure 17 This is a perspective view of the positioning device as seen from below in the second embodiment.

[0032] Figure 18 This is a top view showing an example of the sensor unit of the second embodiment being installed in an analog instrument.

[0033] Figure 19 This is a side view showing an example of the sensor unit of the second embodiment being installed in an analog instrument.

[0034] Figure 20 This diagram illustrates an extended example of the positioning device according to the second embodiment. Detailed Implementation

[0035] [First Implementation]

[0036] Hereinafter, the first embodiment will be described with reference to the accompanying drawings.

[0037] (Composition of the magnet fastener 100)

[0038] Figure 1 This is a perspective view of the magnet fastener 100 according to the first embodiment. Figure 2 This is a top view of the magnet fastener 100 according to the first embodiment. Figure 3 This is a side view of the magnet fastener 100 according to the first embodiment. Figure 4 This is a front view of the magnet fastener 100 according to the first embodiment. Figure 5 This is a bottom view of the magnet fastener 100 according to the first embodiment. Figure 6 To show the magnet fastener 100 of the first embodiment, a cross-sectional line based on A-A (refer to...) Figure 3 A three-dimensional sectional view of the cross section of ).

[0039] Figures 1-6 The magnet holder 100 shown is a component with a relatively thin and generally disc-shaped main body 100A. This is for mounting a disc-shaped magnet 20 (see reference 100A) used for rotation angle detection. Figures 7-9 The pointer 30 of the analog instrument is fixed (refer to...). Figures 7-9 The magnet holder 100 is fitted to the rotation center 30A (the part where the rotation shaft 32 is provided) of the pointer 30. The magnet holder 100 is formed, for example, by injection molding of an elastic resin material such as PP (polypropylene) resin. In the following description, for convenience, the direction along the rotation center AX2 of the rotation shaft 32 is defined as the up-down direction and the Z-axis direction, the length direction of the long needle portion 36 of the pointer 30 is defined as the front-back direction and the X-axis direction, and the width direction of the long needle portion 36 of the pointer 30 is defined as the left-right direction and the Y-axis direction.

[0040] like Figures 1-6 As shown, the main body 100A of the magnet holder 100 has a certain height at its center in the vertical direction (Z-axis direction) and has a slit 102 parallel to the XY plane. The slit 102 is a portion that accommodates a part of the pointer 30 centered on the rotation center AX2. The slit 102 has an opening 102A at its end on the positive Y-axis side. Thus, the slit 102 allows the rotation center 30A of the pointer 30 to be slidably inserted through the opening 102A. The upper surface 102B and lower surface 102C of the opening 102A have a tapered shape that gradually increases in height as it moves outward (towards the positive Y-axis side). Thus, the slit 102 allows the rotation center 30A of the pointer 30 to be easily inserted through the opening 102A. The main body 100A of the magnet fastener 100 has an upper sidewall 110 (positive Z-axis side) and a lower sidewall 120 (negative Z-axis side) of the slit 102 by forming a slit 102. Both the upper sidewall 110 and the lower sidewall 120 are parallel to the XY plane and have a thin, flat plate shape.

[0041] On the upper sidewall portion 110, in the central portion along the front-rear direction (X-axis direction), an upper groove 111 is formed from the left end (positive Y-axis side) toward the center AX1. This upper groove 111 has a certain width in the front-rear direction (X-axis direction) and is formed by cutting grooves extending in the left-right direction (Y-axis direction). The upper groove 111 is formed such that when the pointer 30 slides in the slit portion 102, a cylindrical portion 34 (see reference) protrudes upward from the rotation center portion 30A of the pointer 30. Figure 7 as well as Figure 8 It does not interfere with the upper sidewall portion 110. Therefore, the width of the upper groove 111 in the front-back direction (X-axis direction) is larger than the diameter of the cylindrical portion 34.

[0042] Furthermore, an annular magnet holding portion 112 of a certain height is formed on the upper surface of the upper sidewall portion 110. The magnet holding portion 112 is the part that holds the disc-shaped magnet 20 inside it. The height of the magnet holding portion 112 from the upper surface of the upper sidewall portion 110 is approximately the same as the thickness of the magnet 20, and the inner diameter of the magnet holding portion 112 is approximately the same as the outer diameter of the magnet 20. Thus, the magnet holding portion 112 is the minimum size required, thereby contributing to the miniaturization of the main body portion 100A. The inner diameter of the inner peripheral edge portion 112A (i.e., the upper opening) at the upper end of the magnet holding portion 112 is slightly smaller than the maximum outer diameter of the magnet 20. Therefore, the magnet holding portion 112 can be pressed into the magnet 20 from above, and the magnet 20 is embedded while the inner peripheral edge portion 112A is compressed and expanded. Moreover, the magnet holding portion 112 can hold the magnet 20 in a manner that makes it difficult for the magnet 20 to fall out due to the inner peripheral edge portion 112A.

[0043] A guide portion 121 is formed at the center of the lower side wall portion 120 in the front-rear direction (X-axis direction), extending from the left end (positive Y-axis side) towards the center AX1. This guide portion 121 is formed by cutting a groove extending in the left-right direction (Y-axis direction). When the pointer 30 slides in the slit portion 102, the guide portion 121 guides the rotation axis portion 32 of the pointer 30 (see reference AX1). Figure 7 It does not interfere with the lower sidewall portion 120 and is configured to guide the rotation shaft portion 32 toward the rotation shaft holding portion 122. Therefore, the width of the guide portion 121 in the front-back direction (X-axis direction) is not only larger than the rotation shaft holding portion 122 and the rotation shaft limiting portion 124, but also larger than the diameter of the rotation shaft portion 32.

[0044] A rotation shaft holding portion 122 is formed at the center AX1 of the guide portion 121 to hold the rotation shaft portion 32, which is provided protruding downward from the rotation center portion 30A of the pointer 30. The rotation shaft holding portion 122 is circular when viewed from above. The inner diameter of the rotation shaft holding portion 122 is smaller than the diameter of the rotation shaft portion 32.

[0045] A rotation shaft limiting part 124 is formed at the entrance of the rotation shaft holding part 122 of the guide part 121 to prevent the rotation shaft part 32 from disengaging from the rotation shaft holding part 122. The width of the rotation shaft limiting part 124 is smaller than the diameter of the rotation shaft part 32 and smaller than the diameter of the rotation shaft holding part 122.

[0046] Here, the guide portion 121 is a space sandwiched between a first elastic beam portion 123A disposed on the front side (positive X-axis side) of the guide portion 121 and a second elastic beam portion 123B disposed on the rear side (negative X-axis side) of the guide portion 121. That is, the wall surface of the front side (positive X-axis side) of the guide portion 121 is formed on the first elastic beam portion 123A, and the wall surface of the rear side (negative X-axis side) of the guide portion 121 is formed on the second elastic beam portion 123B.

[0047] The first elastic beam portion 123A and the second elastic beam portion 123B are capable of elastic deformation in the front-back direction (X-axis direction), and their two ends in the left-right direction (Y-axis direction) are supported by the lower side wall portion 120.

[0048] Thus, the magnet fixing member 100 of the first embodiment can insert the rotating shaft portion 32 into the rotating shaft retaining portion 122 while the rotating shaft portion 32 is pressed and expanded by the rotating shaft portion 32 in the guide portion 121 when the rotating shaft portion 32 slides toward the rotating shaft holding portion 122.

[0049] At this time, the magnet fixing member 100 of the first embodiment can compress and expand the rotating shaft holding portion 122 by the rotating shaft portion 32, thereby adjusting the rotating shaft holding portion 122 to a size corresponding to the diameter of the rotating shaft portion 32. As a result, the magnet fixing member 100 of the first embodiment can reliably hold the rotating shaft portion 32 by the rotating shaft holding portion 122 without loosening between the rotating shaft holding portion 122 and the rotating shaft portion 32.

[0050] Furthermore, the diameter of the rotating shaft holding part 122 centered on the center AX1 can be varied by the elastic deformation generated by the first elastic beam part 123A and the second elastic beam part 123B. Therefore, the rotating shaft part 32 can be clamped in accordance with various thicknesses of the rotating shaft part 32.

[0051] Furthermore, the magnet retainer 100 of the first embodiment can prevent the rotating shaft portion 32 held by the rotating shaft retainer 122 from easily coming off the rotating shaft retainer 122 by means of the rotating shaft limiting portion 124 provided at the entrance of the rotating shaft retainer 122.

[0052] Furthermore, the centers of the rotation shaft holding portion 122 and the magnet holding portion 112 are both aligned with the center AX1 of the magnet fixing member 100. Moreover, regardless of the diameter of the rotation shaft portion 32, the center of the rotation shaft holding portion 122 is aligned with the rotation center AX2 of the rotation shaft portion 32. Therefore, regardless of the diameter of the rotation shaft portion 32, the magnet fixing member 100 of the first embodiment can ensure that the rotation center AX2 of the rotation shaft portion 32 is aligned with the center AX1 of the magnet fixing member 100, that is, it can ensure that the rotation center AX2 of the rotation shaft portion 32 is aligned with the center of the magnet 20. Thus, the magnet fixing member 100 of the first embodiment can suppress the rotational offset of the magnet 20 associated with the rotation of the rotation shaft portion 32.

[0053] In addition, the magnet fixing member 100 has a pointer limiting part 130, which is provided outward (in the positive direction of the X-axis) from the outer periphery of the main body part 100A (upper side wall part 110) to limit the rotation of the pointer 30 relative to the main body part 100A (upper side wall part 110).

[0054] Specifically, the pointer limiting part 130 has: a protrusion 131, which protrudes forward (positive X-axis direction) from the outer periphery of the front side (positive X-axis side) of the upper sidewall part 110 toward the front of the long needle part 36 of the pointer 30 in the longitudinal dimension direction; and a tongue part 132, which extends to the right (negative Y-axis direction) of the long needle part 36 of the pointer 30 in the width direction from the upper surface of the protrusion 131. The tongue part 132 is capable of elastic deformation in a direction parallel to the rotation center AX2 (Z-axis direction), pressing the long needle part 36 of the pointer 30 disposed below the tongue part 132 from above.

[0055] Furthermore, the tongue portion 132 is inclined from the protrusion 131, with the gap 130A between it and the protrusion 131 gradually widening downwards (in the negative Z-axis direction). Thus, the pointer limiting portion 130 can hold both ends of the long needle portion 36 of the pointer 30 disposed in the gap 130A in the width direction through the first abutting surface 131A exposed in the gap 130A of the protrusion 131 and the second abutting surface 132A exposed in the gap 130A of the tongue portion 132.

[0056] (The composition of structure 10)

[0057] Figure 7 This is an exploded perspective view of the structure 10 according to the first embodiment. Figure 7As shown, the structure 10 of the first embodiment includes a magnet holder 100, a magnet 20, and a pointer 30. The magnet holder 100 is assembled to the pointer 30 by inserting the pointer 30 into the slot 102, such that the center AX1 of the magnet holder 100 is aligned with the rotation center AX2 of the rotation axis 32 of the pointer 30.

[0058] Magnet 20 is mounted on magnet holding part 112 of magnet holder 100 for detecting the rotation angle of pointer 30. Magnet 20 is mounted on magnet holding part 112 such that its center 20A coincides with the center AX1 of magnet holder 100 and the center of magnet 20 used for rotation angle detection. Magnet 20 has a thin, disc-shaped structure. When viewed from above, magnet 20 is magnetized with N and S poles along a boundary line 20B passing through its center 20A.

[0059] (Assembly method for Construct 10)

[0060] Next, refer to Figures 8-12 The assembly method of the structure 10 of the first embodiment will be described. Figure 8 as well as Figure 9 This is a diagram illustrating the assembly method of the magnet fastener 100 according to the first embodiment. Figure 10 as well as Figure 11 This is a diagram illustrating the assembly method of the magnet 20 in the first embodiment. Figure 12 for Figure 11 The diagram shows a cross-sectional view of structure 10 along line A-A.

[0061] First, such as Figure 8 As shown, the rotation center portion 30A of the pointer 30 is inserted into the slit portion 102 through the opening 102A formed on the positive side of the Y-axis of the magnet fixing member 100, causing the rotation center portion 30A of the pointer 30 to slide in the negative Y-axis direction within the slit portion 102. At this time, the rotation axis portion 32 of the pointer 30 slides in the negative Y-axis direction within the guide portion 121 between the first elastic beam portion 123A and the second elastic beam portion 123B. Furthermore, at this time, the cylindrical portion 34 of the pointer 30 slides in the negative Y-axis direction within the upper sliding groove 111 formed on the upper sidewall portion 110.

[0062] Furthermore, when the rotation axis portion 32 of the pointer 30 abuts against the rotation axis limiting portion 124 in the guide portion 121, which is narrower than the width of the rotation axis portion 32, the rotation center portion 30A of the pointer 30 is further pressed into the negative Y-axis direction. Thus, while the rotation axis limiting portion 124 is expanded by the rotation axis portion 32 of the pointer 30, the rotation axis portion 32 of the pointer 30 can be inserted into the rotation axis holding portion 122.

[0063] As a result, Figure 9As shown, the magnet fixing member 100 is assembled to the pointer 30 in such a way that the center AX1 of the magnet fixing member 100 coincides with the rotation center AX2 of the rotation shaft portion 32 of the pointer 30.

[0064] Furthermore, by performing the action of inserting the rotating shaft portion 32 into the rotating shaft holding portion 122, the insertion action of the pointer 30, described later, is performed simultaneously. Thus, as... Figure 9 As shown, the long needle portion 36 of the pointer 30 is inserted into the gap 130A of the pointer limiting portion 130, which protrudes forward (in the positive X-axis direction) from the main body portion 100A of the magnet fixing member 100. As a result, the rotation of the pointer 30 relative to the main body portion 100A of the magnet fixing member 100 is restricted.

[0065] Moreover, such as Figure 10 as well as Figure 11 As shown, the magnet 20 for detecting the rotation angle is embedded in the magnet holding part 112 of the magnet fixing member 100. Thus, as... Figure 11 As shown, the magnet holder 100 is used to assemble the magnet 20 into the magnet holding part 112 in such a way that the center AX1 of the magnet holder 100 is aligned with the rotation center AX2 of the rotation shaft 32 of the pointer 30 and the center of the magnet 20 used for rotation angle detection.

[0066] Furthermore, the description is based on the sequence of inserting the rotation axis portion 32 of the pointer 30 into the rotation axis holding portion 122 and then inserting the magnet 20 for detecting the rotation angle into the magnet holding portion 112 of the magnet holder 100. However, it is also possible to insert the magnet 20 for detecting the rotation angle into the magnet holding portion 112 of the magnet holder 100 before inserting the rotation axis portion 32 of the pointer 30 into the rotation axis holding portion 122.

[0067] Here, as Figure 12 As shown, the height of the magnet holding part 112 is approximately the same as the thickness of the magnet 20, and the inner diameter of the magnet holding part 112 is approximately the same as the outer diameter of the magnet 20. Therefore, the magnet holding part 112 is made to the minimum required size, which helps to miniaturize the main body 100A.

[0068] In addition, such as Figure 12As shown, the inner diameter of the inner peripheral edge portion 112A (i.e., the upper opening) at the upper end of the magnet holding portion 112 is slightly smaller than the maximum outer diameter of the magnet 20. Therefore, the magnet holding portion 112 allows the magnet 20 to be pressed in from above, and the magnet 20 is embedded while the inner peripheral edge portion 112A is expanded. Furthermore, the magnet holding portion 112 can hold the magnet 20 in a manner that prevents it from easily falling out due to the inner peripheral edge portion 112A. In particular, the inner peripheral edge portion 112A has a shape that holds the curved upper corner of the outer peripheral edge of the magnet 20; therefore, a protective cover for the magnet 20 is not required, and the magnet holding portion 112 has a height that is the same as the thickness of the magnet 20. Thus, the magnet fixing member 100 of the first embodiment is thinner and smaller. For example, in this embodiment, the magnet 20 has a thickness of 1 mm and a diameter of 20 mm. In contrast, the magnet fixing member 100 has a thickness of approximately 3 mm and a length of approximately 23 mm for one side.

[0069] Furthermore, the magnet fastener 100 of the first embodiment can accommodate various magnets 20 with different diameters or thicknesses by changing the shape of the magnet holding part 112.

[0070] (The insertion action of the long needle part 36 of pointer 30)

[0071] Figure 13 as well as Figure 14 This is a diagram illustrating the insertion action of the long needle portion 36 of the pointer 30 relative to the magnet fixing member 100 of the first embodiment.

[0072] like Figure 13 As shown, when the rotation center 30A of the pointer 30 slides in the negative Y-axis direction within the slit 102 and the rotation shaft 32 of the pointer 30 is inserted into the rotation shaft holding part 122, the long needle part 36 of the pointer 30 abuts against the inclined bottom surface 131B of the protrusion 131 of the pointer limiting part 130, which is provided protruding forward (positive X-axis direction) from the main body 100A of the magnet fixing member 100.

[0073] If the rotation center 30A of the pointer 30 is further slid in the negative Y-axis direction within the gap 102, the long needle 36 of the pointer 30 will elastically deform downward along the bottom surface 131B while moving in the negative Y-axis direction.

[0074] Furthermore, if the long hand 36 of pointer 30 crosses the bottom surface 131B, then as Figure 14 As shown, the long needle portion 36 of the pointer 30 presses the tongue portion 132 of the pointer limiting portion 130 upward, thereby being positioned in the gap 130A between the tongue portion 132 and the protrusion 131.

[0075] Therefore, as Figure 14 As shown, the two ends of the long needle portion 36 of the pointer 30 in the width direction (Y-axis direction) are held by a first abutting surface 131A exposed to the gap 130A of the protrusion 131 and a second abutting surface 132A exposed to the gap 130A of the tongue portion 132.

[0076] Furthermore, the tongue portion 132 of the pointer limiting portion 130 undergoes elastic deformation, thereby making the width and height position of the gap 130A variable. Therefore, the two ends of the long needle portion 36 in the width direction can be maintained in accordance with the various widths and thicknesses of the long needle portion 36.

[0077] (Example of the configuration of the rotation angle detection system 200)

[0078] Figure 15 This diagram illustrates a configuration example of the rotation angle detection system 200 according to the first embodiment. Figure 15 As shown, the rotation angle detection system 200 includes an analog instrument 210, a rotation angle detection device 220, and a rotation angle transmitter 230.

[0079] The analog instrument 210 includes a pointer 30 and a glass cover 211. In the embodiment, the magnetic retainer 100 is mounted on the pointer 30. The analog instrument 210 is, for example, a water meter, an electricity meter, a gas meter, etc.

[0080] A rotation angle detection device 220 is mounted at the center of the surface of the glass cover 211 (i.e., the rotation center AX2 of the pointer 30). The rotation angle detection device 220 magnetically detects the rotation angle of the pointer 30 by means of a rotation angle detection sensor (not shown) disposed opposite to the magnet 20 mounted on the magnet holder 100. Then, the rotation angle detection device 220 transmits the detected rotation angle detection signal, representing the rotation angle, to the rotation angle transmitter 230 via cable or wireless communication (e.g., Bluetooth wireless communication). For example, the rotation angle detection device 220 continuously detects the rotation angle of the pointer 30 at predetermined time intervals (e.g., n-second intervals) and continuously transmits the rotation angle detection signal to the rotation angle transmitter 230 at predetermined time intervals (e.g., n-second intervals).

[0081] The rotation angle transmitter 230 receives a rotation angle detection signal from the rotation angle detection device 220 and performs prescribed processing using the rotation angle of the pointer 30 represented by the rotation angle detection signal (e.g., monitoring display, anomaly detection, recording, data transmission to other devices, etc.). For example, the rotation angle transmitter 230 transmits the detected rotation angle detection signal, representing the rotation angle, to a gateway or cloud via wireless communication (e.g., Bluetooth wireless communication, Sigfox wireless communication).

[0082] Furthermore, the rotation angle detection device 220 can be powered, for example, by a battery provided with the rotation angle transmitter 230 via a cable. In this case, the rotation angle detection sensor attached to the rotation angle detection device 220 can be configured to the minimum required specifications, allowing the rotation angle detection device 220 to be configured to be smaller.

[0083] As described above, the magnet fixing member 100 of the first embodiment is a magnet fixing member 100 mounted on the rotation center portion 30A of the pointer 30 of an analog instrument for fixing a disc-shaped magnet 20 for detecting rotation angle. The magnet fixing member 100 includes: a main body portion 100A; a magnet holding portion 112 provided on the upper surface of the main body portion 100A, which holds the magnet 20 at the rotation center AX2 of the pointer 30 in a state orthogonal to the rotation center AX2; a slit portion 102 formed on the main body portion 100A in a planar shape orthogonal to the rotation center AX2, which accommodates the rotation center portion 30A of the pointer 30; a rotation shaft holding portion 122 provided on the lower side of the slit portion 102 on the main body portion 100A, which holds the rotation shaft portion 32 of the pointer 30; and a pointer limiting portion 130 provided protruding outward from the outer periphery of the main body portion 100A, which limits the rotation of the pointer 30 relative to the main body portion 100A.

[0084] Therefore, the magnet retainer 100 of the first embodiment can fix the magnet 20 to the rotation center 30A of the pointer 30 with different diameters of the rotating shaft portion 32, simply by being fitted to the rotation center 30A of the pointer 30, with the center of the magnet 20 aligned with the rotation center AX2 of the pointer 30. Furthermore, since the magnet retainer 100 of the first embodiment holds the magnet 20 by the upper surface of the main body portion 100A, a protective cover for the upper surface of the magnet 20 is not required, allowing for a thinner main body portion 100A. Therefore, according to the magnet retainer 100 of the first embodiment, a versatile, thin magnet retainer 100 can be provided that can easily and reliably fix the magnet 20 to the rotation center 30A of the pointer 30 with the center of the magnet 20 aligned with the rotation center AX2 of the pointer 30.

[0085] Furthermore, in the magnet fastener 100 of the first embodiment, the main body 100A has a first elastic beam portion 123A and a second elastic beam portion 123B arranged opposite to each other on the lower side of the gap portion 102. The rotation shaft holding portion 122 is provided between the first elastic beam portion 123A and the second elastic beam portion 123B, and the rotation shaft portion 32 is clamped by the first elastic beam portion 123A and the second elastic beam portion 123B, thereby holding the rotation shaft portion 32.

[0086] Therefore, regardless of the diameter of the rotating shaft portion 32, the magnet fixing member 100 of the first embodiment can keep the center of the magnet 20 aligned with the rotation center AX2 of the pointer 30 simply by holding the rotating shaft portion 32 with the rotating shaft holding portion 122.

[0087] Furthermore, in the magnet fastener 100 of the first embodiment, the main body 100A has a guide portion 121 between the first elastic beam portion 123A and the second elastic beam portion 123B. The guide portion extends in such a way that its width gradually narrows from the outer periphery of the main body 100A toward the rotation shaft holding portion 122, guiding the rotation shaft portion 32 toward the rotation shaft holding portion 122.

[0088] Therefore, the magnet fastener 100 of the first embodiment can easily and reliably assemble the rotating shaft portion 32 relative to the rotating shaft holding portion 122.

[0089] Furthermore, in the magnet fixing member 100 of the first embodiment, the pointer limiting part 130 has: a protrusion 131, which is provided to protrude from the outer periphery of the main body part 100A toward the long dimension direction of the pointer 30; and a tongue part 132, which is provided extending from the protrusion 131 in the width direction of the pointer 30, and can generate elastic deformation in a direction parallel to the rotation center AX2 to press the pointer 30.

[0090] Thus, the magnet fixing member 100 of the first embodiment can adjust the height position of the tongue portion 132 that presses the pointer 30 according to the various thicknesses of the pointer 30 by elastically deforming the tongue portion 132.

[0091] Furthermore, in the magnet retainer 100 of the first embodiment, the tongue portion 132 is inclined from the protrusion 131 in such a way that the gap 130A between it and the protrusion 131 gradually widens in a direction parallel to the rotation center AX2. The pointer limiting portion 130 retains the two ends of the pointer 30 disposed in the gap 130A in the width direction through the first abutting surface 131A of the protrusion 131 exposed to the gap 130A and the second abutting surface 132A of the tongue portion 132 exposed to the gap 130A.

[0092] Thus, the magnet retainer 100 of the first embodiment can adjust the width of the gap 130A according to the various widths of the pointer 30 by elastically deforming the tongue portion 132, thereby retaining both ends of the pointer 30.

[0093] Furthermore, in the magnet fixing member 100 of the first embodiment, the slit portion 102 has an opening portion 102A on the outer periphery of the main body portion 100A, so that the rotation center portion 30A of the pointer 30 can slide from the opening portion 102A in a direction orthogonal to the rotation center AX2, thereby enabling the rotation center portion 30A of the pointer 30 to be accommodated in the slit portion 102.

[0094] Thus, the magnet holder 100 of the first embodiment can easily and reliably accommodate the rotation center portion 30A of the pointer 30 within the slit portion 102.

[0095] Furthermore, the magnet fastener 100 of the first embodiment is integrally formed using an elastic resin material.

[0096] Therefore, the magnet fastener 100 of the first embodiment can easily and reliably form the part that undergoes elastic deformation into one piece.

[0097] Furthermore, the magnet fastener 100 of the first embodiment is formed by injection molding of resin raw materials.

[0098] Therefore, the magnet fastener 100 of the first embodiment can be formed with higher precision.

[0099] [Second Implementation]

[0100] The second embodiment will now be described with reference to the accompanying drawings.

[0101] (Composition of positioning device 100)

[0102] Figure 16 This is a perspective view of the positioning device 100 as seen from above in the second embodiment. Figure 17 This is a perspective view of the positioning device 100 as seen from below in the second embodiment. In the following description, for convenience, the direction orthogonal to the surface 210A of the protective glass 210 of the analog instrument 200 is defined as the vertical direction (Z-axis direction). Furthermore, the surface 210A side of the protective glass 210 is designated as the upper side (positive Z-axis side), and the back side of the protective glass 210 is designated as the lower side (negative Z-axis side).

[0103] Figure 16The positioning device 100 shown is a device for positioning the sensor unit 300 relative to the center of the surface 210A of the generally circular and transparent protective glass 210 (an example of a "protective component") covering the display surface of the analog instrument 200.

[0104] like Figure 16 As shown, the positioning device 100 includes: a pair of clamping members 111 and 112, two racks 121 and 122, a pinion 123, a center block 130, a positioning plate 140, and two pins 151 and 152. Furthermore, all the constituent parts of the positioning device 100 are formed using relatively hard materials (e.g., resin or metal).

[0105] A pair of clamping members 111 and 112 are arranged opposite each other in the X-axis direction (an example of the "first direction"). The pair of clamping members 111 and 112 clamp the outer peripheral surface 212A of the outer frame 212 of the protective glass 210 of the analog instrument 200. The pair of clamping members 111 and 112 are so-called V-blocks, having V-shaped support surfaces 111A and 112A when viewed from above. The support surfaces 111A and 112A are opposite each other. Figure 16 as well as Figure 17 As shown, a pair of clamping components 111 and 112 press against the outer peripheral surface 212A of the outer frame 212 through each of the support surfaces 111A and 112A, thereby clamping the outer peripheral surface 212A.

[0106] Furthermore, the clamping member 111 has a first through hole 111B and a second through hole 111C that are parallel to each other and extend through the clamping member 111 in the X-axis direction. The first through hole 111B is provided on the positive Y-axis side of the clamping member 111, through which the positive X-axis end of the rack 121 is inserted. For the clamping member 111, by threading two screws 113 provided near the first through hole 111B, the inner diameter of the first through hole 111B is narrowed, and the positive X-axis end of the rack 121 is fixed. The second through hole 111C is provided on the negative Y-axis side of the clamping member 111, through which the positive X-axis end of the rack 122 is slidably inserted.

[0107] Furthermore, the clamping member 112 has a first through hole 112B and a second through hole 112C that are parallel to each other and extend through the clamping member 112 in the X-axis direction. The first through hole 112B is provided on the negative Y-axis side of the clamping member 112, through which the negative X-axis end of the rack 122 is inserted. For the clamping member 112, by threading two screws 113 provided near the first through hole 112B, the inner diameter of the first through hole 112B is narrowed, and the negative X-axis end of the rack 122 is fixed. The second through hole 112C is provided on the positive Y-axis side of the clamping member 112, through which the negative X-axis end of the rack 121 is slidably inserted.

[0108] Two racks 121 and 122 are arranged parallel to each other in the X-axis direction. The two racks 121 and 122 connect the pair of clamping members 111 and 112 in a manner that allows adjustment of the separation distance between them. Both racks 121 and 122 are rod-shaped components extending linearly in the X-axis direction. The inner portions of each rack 121 and 122 have a plurality of rack teeth 121A and 122A continuously formed in the X-axis direction.

[0109] The rack 121 is located on the positive side of the Y-axis. The end of the rack 121 on the positive side of the X-axis is fixed to the clamping member 111 in a state where it is inserted through the first through hole 111B of the clamping member 111. The end of the rack 121 on the negative side of the X-axis is slidably inserted through the second through hole 112C of the clamping member 112.

[0110] The rack 122 is located on the negative side of the Y-axis. The end of the rack 122 on the negative side of the X-axis is fixed to the clamping member 112 in a state where it is inserted through the first through hole 112B of the clamping member 112. The end of the rack 122 on the positive side of the X-axis is slidably inserted through the second through hole 111C of the clamping member 111.

[0111] A pinion 123 is disposed within a circular receiving space 131 formed on the back side of the central block 130 and between two racks 121 and 122. The pinion 123 is capable of rotating within the receiving space 131 of the central block 130. The pinion 123 meshes with the rack teeth 121A of rack 121 and the rack teeth 122A of rack 122, respectively. Thus, as the pinion 123 rotates, it causes the two racks 121 and 122 to move equally in different directions along the X-axis.

[0112] Specifically, pinion 123 is able to... Figure 17When rotated clockwise (arrow D1) as shown when viewed from the bottom side, rack 121 moves in the negative X-axis direction, and rack 122 moves in the positive X-axis direction in an equal amount with rack 121. In this case, the clamping member 111 fixed to rack 121 and the clamping member 112 fixed to rack 122 move in equal amounts toward each other. Therefore, the center block 130 remains in the intermediate position between the pair of clamping members 111 and 112.

[0113] Conversely, pinion 123 is able to... Figure 17 When rotated counterclockwise (arrow D2) as shown when viewed from the bottom side, rack 121 moves in the positive X-axis direction, and rack 122 moves in the negative X-axis direction by an equal amount to rack 121. In this case, the clamping member 111 fixed to rack 121 and the clamping member 112 fixed to rack 122 move in equal amounts in the direction separating from each other. Therefore, the center block 130 remains in the intermediate position between the pair of clamping members 111 and 112.

[0114] The center block 130 is a block-shaped component extending in the Y-axis direction. The center block 130 is orthogonal to each of the two racks 121 and 122, and extends outward beyond each of the two racks 121 and 122. The center of the center block 130 coincides with the center of the positioning device 100. The center of the center block 130 remains aligned with the center of the positioning device 100 regardless of changes in the separation distance between the pair of clamping members 111 and 112. Furthermore, the "center of the positioning device 100" is the position between the pair of clamping members 111 and 112 in the X-axis direction and the two racks 121 and 122 in the Y-axis direction.

[0115] like Figure 17 As shown, the center block 130 has a circular receiving space 131 in the center of the back side. The receiving space 131 accommodates the pinion 123 so that it can rotate about the center of the positioning device 100.

[0116] Furthermore, the center block 130 has a first through hole 132A and a second through hole 132B that are parallel to each other and extend through the center block 130 in the X-axis direction. The first through hole 132A is provided on the positive Y-axis side of the center block 130, through which the rack 121 can be slidably inserted. The first through hole 132A has an opening on the receiving space 131 side. Thus, the rack teeth 121A of the rack 121 that are inserted through the first through hole 132A can mesh with the pinion 123. The second through hole 132B is provided on the negative Y-axis side of the center block 130, through which the rack 122 can be slidably inserted. The second through hole 132B has an opening on the receiving space 131 side. Thus, the rack teeth 122A of the rack 122 that are inserted through the second through hole 132B can mesh with the pinion 123.

[0117] Positioning plate 140 is an example of a "positioning component". Positioning plate 140 is a flat plate extending in the Y-axis direction, disposed opposite to the upper surface of center block 130. Positioning plate 140 is orthogonal to each of the two racks 121, 122, and extends outward beyond each of the two racks 121, 122. The center of positioning plate 140 coincides with the center of positioning device 100. The center of positioning plate 140 remains in a state of coincidence with the center of positioning device 100 regardless of changes in the separation distance between the pair of clamping components 111, 112.

[0118] A retaining hole 141 is formed at the center of the positioning plate 140. The retaining hole 141 has the same shape as the protrusion 301A of the sensor housing 301 of the sensor unit 300. The positioning plate 140 can hold the sensor unit 300 such that the center of the positioning plate 140 is aligned with the center of the sensor housing 301 by inserting the protrusion 301A of the sensor housing 301 into the retaining hole 141. That is, the positioning plate 140 can position the magnetic sensor 302 located at the center of the sensor unit 300 relative to the center of the surface 210A of the protective glass 210 by holding the sensor unit 300.

[0119] Furthermore, the positioning plate 140 has a groove 143 formed by cutting a groove from the outer periphery of the positioning plate 140 to the retaining hole 141. The groove 143 is configured to pull the cable 303 of the sensor unit 300 out of the retaining hole 141 to the outside of the positioning plate 140 when the positioning plate 140 is removed from the sensor unit 300 after the sensor unit 300 is assembled onto the surface 210A of the protective glass 210.

[0120] Two pins 151 and 152 engage with both the center block 130 and the positioning plate 140, positioning the positioning plate 140 at the center of a pair of clamping members 111 and 112. As already explained, the center of the center block 130 is always aligned with the center of the positioning device 100 (i.e., the center of the surface 210A of the protective glass 210) regardless of changes in the separation distance between the center block 130 and the pair of clamping members 111 and 112. In this embodiment, the positioning device 100 positions the positioning plate 140 relative to the center block 130 using two pins 151 and 152. Thus, the positioning device 100 of this embodiment can, in the same way as the center block 130, position the center of the positioning plate 140 in alignment with the center of the positioning device 100 (i.e., the center of the surface 210A of the protective glass 210).

[0121] In this embodiment, as an example, two rod-shaped pins 151 and 152 are used. Pin 151 is located on the positive side of the Y-axis. The lower end of pin 151 is fixed by being inserted into a support hole 133A formed at the end of the center block 130 on the positive side of the Y-axis. The upper end of pin 151 is inserted into a support hole 142A formed at the end of the positioning plate 140 on the positive side of the Y-axis. Thus, pin 151 positions the positioning plate 140 on the positive side of the Y-axis.

[0122] Pin 152 is located on the negative side of the Y-axis. The lower end of pin 152 is fixed by being inserted into a support hole 133B formed on the negative side of the Y-axis of the center block 130. The upper end of pin 152 is inserted into a support hole 142B formed on the negative side of the Y-axis of the positioning plate 140. Thus, pin 152 positions the negative side of the Y-axis of the positioning plate 140.

[0123] (Assembly method of sensor unit 300)

[0124] Next, the assembly method of the sensor unit 300 using the positioning device 100 will be described.

[0125] (1) First, the operator pulls a pair of clamping parts 111 and 112 in a direction that separates them from each other, thereby widening the gap between the pair of clamping parts 111 and 112 and forming a space on the upper surface of the center block 130 for the protective glass 210 and the outer frame 212 to be placed. At this time, the center of the center block 130 is kept in the same state as the center of the positioning device 100.

[0126] (2) Next, the operator places the protective glass 210 and the outer frame 212 on the upper surface of the center block 130. Since the protective glass 210 and the outer frame 212 can be placed on the center block 130, the positioning device 100 of the second embodiment can more easily perform clamping by the subsequent pair of clamping members 111, 112.

[0127] (3) Next, the operator presses a pair of clamping parts 111 and 112 closer together, thereby narrowing the gap between the pair of clamping parts 111 and 112 and causing the support surfaces 111A and 112A to abut against the outer peripheral surface of the outer frame 212. Thus, corresponding to the outer diameter of the outer frame 212, the outer frame 212 is clamped by the pair of clamping parts 111 and 112, and the center of the positioning device 100 coincides with the center of the surface 210A of the protective glass 210.

[0128] (4) Next, the operator places the support holes 142A and 142B of the positioning plate 140 onto the upper ends of the pins 151 and 152. Thus, the center of the positioning device 100 is aligned with the center of the surface 210A of the protective glass 210 and the center of the positioning plate 140.

[0129] (5) Next, the operator peels off the release paper of the double-sided adhesive tape attached to the bottom surface of the sensor housing 301 and inserts the protrusion 301A of the sensor housing 301 into the holding hole 141 of the positioning plate 140. As a result, the center of the sensor housing 301 is aligned with the center of the surface 210A of the protective glass 210.

[0130] (6) Next, the operator presses the sensor housing 301 against the surface 210A of the protective glass 210. Thus, with the center of the sensor housing 301 aligned with the center of the surface 210A of the protective glass 210, the sensor housing 301 is fixed to the surface 210A of the protective glass 210.

[0131] (7) Next, the operator pulls the positioning plate 140 upward and pulls the cable 303 out to the outside of the positioning plate 140 through the groove 143 from the retaining hole 141 of the positioning plate 140, thereby removing the positioning plate 140.

[0132] (8) Next, the operator removes the protective glass 210 and the outer frame 212 from the positioning device 100 and assembles them into the housing 201 of the analog instrument 200.

[0133] (9) Next, the operator fixes the protective glass 210 and the outer frame 212 to each other by means of transparent tape or other fixing methods so that the protective glass 210 does not rotate.

[0134] Following the above sequence, the operator can assemble the sensor unit 300 onto the surface 210A of the protective glass 210 of the analog instrument 200, with the center of the surface 210A of the protective glass 210 aligned with the center of the sensor housing 301. Therefore, according to the positioning device 100 of the second embodiment, the magnetic sensor 302 can be easily positioned at the center of the analog instrument 200 for various types of analog instruments 200 with different outer diameters.

[0135] (Example of sensor unit 300 setup)

[0136] Figure 18 This is a top view showing an example of the sensor unit 300 of the second embodiment being installed in the analog instrument 200. Figure 19 This is a side view showing an example of the sensor unit 300 of the second embodiment being installed in the analog instrument 200. Additionally, in Figure 19 In the image, a cross-section of sensor unit 300 is shown.

[0137] Figure 18 The simulated instrument 200 shown is, for example, a water meter, electricity meter, gas meter, etc. Figure 18 As shown, the analog instrument 200 includes a housing 201, a display surface 202, a pointer 203, a magnet 204, a protective glass 210, and an outer frame 212. The housing 201 is a cylindrical component with a closed bottom forming the shape of the analog instrument 200. The display surface 202 is a horizontal plane located inside the housing 201, facing the space above the analog instrument 200. The display surface 202 is circular when viewed from above. The display surface 202 has scales continuously printed along its circumference, representing various measured values. The pointer 203 has a rotation axis 203A, and by rotating around the rotation axis 203A as the center of rotation, it indicates the scales printed on the display surface 202 corresponding to various measured values. The magnet 204 is disc-shaped and mounted at the center of rotation of the pointer 203. When viewed from above, the magnet 204 is magnetized with N and S poles along a boundary line passing through its center. The protective glass 210 is an example of a "generally circular and transparent protective cover component, which is a transparent and disc-shaped glass component covering the display surface 202." The term "generally circular and transparent protective cover component" is not limited to glass; it can also be made of resin. The outer frame 212 is a circular frame-shaped component that is fitted into the opening edge on the upper side (positive Z-axis side) of the housing 201. The outer frame 212 holds the outer periphery of the protective glass 210 disposed inside it.

[0138] like Figure 18 as well as Figure 19As shown, the sensor unit 300 is mounted at the center of the surface 210A of the protective glass 210 of the analog instrument 200 (i.e., the rotation center of the pointer 203) using the positioning device 100. For the sensor unit 300, a magnet 204 is positioned at the center inside the sensor housing 301, facing the analog instrument 200 side (negative Z-axis side). With the sensor unit 300 mounted at the center of the surface 210A of the protective glass 210, the magnetic sensor 302 is positioned opposite the magnet 204 mounted at the rotation center of the pointer 203 of the analog instrument 200. Thus, the magnetic sensor 302 can magnetically detect the rotation angle of the pointer 203. Then, the sensor unit 300 transmits the rotation angle detection signal, representing the rotation angle detected by the magnetic sensor 302, to the rotation angle transmitter 230 via the cable 303 and the wireless communication device 220. For example, the sensor unit 300 continuously detects the rotation angle of the pointer 203 at a predetermined time interval (e.g., n-second interval) and continuously sends rotation angle detection signals to the rotation angle transmitter 230 at a predetermined time interval (e.g., n-second interval).

[0139] The rotation angle transmitter 230 receives a rotation angle detection signal from the sensor unit 300 and performs prescribed processing using the rotation angle of the pointer 203 represented by the rotation angle detection signal (e.g., monitoring display, anomaly detection, recording, data transmission to other devices, etc.). For example, the rotation angle transmitter 230 transmits the detected rotation angle detection signal, representing the rotation angle, to a gateway or cloud via wireless communication (e.g., Bluetooth wireless communication, Sigfox wireless communication).

[0140] (Extended example of positioning device 100)

[0141] Figure 20 This diagram illustrates an extended example of the positioning device 100 according to the second embodiment. Figure 20 In the extended example shown, the positioning device 100 also includes a pair of V-shaped adapters 161 and 162. The pair of V-shaped adapters 161 and 162 are fitted onto the support surfaces 111A and 112A of the pair of clamping members 111 and 112, thereby reducing the minimum diameter of the outer frame that can be clamped by the pair of clamping members 111 and 112 through the V-shaped support surfaces 161A and 162A.

[0142] Furthermore, in this specification, "generally circular and transparent protective cover component" does not mean a perfect circle, but also includes cases where a portion of the circle has protrusions, depressions, cuts, etc. In short, the "protective cover component" is a shape that allows the "sensor unit" to be positioned at the center by a "positioning device".

[0143] The present invention has been described in detail above, but the present invention is not limited to these embodiments. Various modifications or alterations can be made within the scope of the spirit of the present invention as set forth in the claims.

[0144] This international application claims priority to Japanese Patent Application No. 2020-066968, filed on April 2, 2020, and Japanese Patent Application No. 2020-102578, filed on June 12, 2020, the entire contents of which are incorporated herein by reference.

[0145] Explanation of reference numerals in the attached figures

[0146] 10 Constructs

[0147] 20 magnets

[0148] 30 pointers

[0149] 30A Rotation Center

[0150] 32 Rotating shaft

[0151] 34. Cylindrical section

[0152] 100 Magnet Fixtures

[0153] 100A main body

[0154] 102 Gap

[0155] 102A Opening

[0156] 102B upper surface

[0157] 102C lower surface

[0158] 110 Upper sidewall

[0159] 111 Upper sliding groove

[0160] 112 Magnet holding part

[0161] 112A Inner peripheral region

[0162] 120 Lower side wall

[0163] 121 Guidance Department

[0164] 122 Rotary shaft retaining part

[0165] 123A First Elastic Beam

[0166] 123B Second Elastic Beam

[0167] 124 Rotation shaft limiting part

[0168] 130 Pointer Limiting Section

[0169] 130A clearance

[0170] 131 Protrusion

[0171] 131A First Abutment Surface

[0172] 132 Tongue portion

[0173] 132A Second Abutment Surface

[0174] 200° Rotation Angle Detection System

[0175] 210 Analog Instruments

[0176] 211 Glass Cover

[0177] 220° Rotation Angle Detection Device

[0178] 230° Rotation Angle Transmitter

[0179] AX1 Center

[0180] AX2 Rotation Center

[0181] 100 Positioning Device

[0182] Clamping components 111 and 112

[0183] 111A and 112A support surfaces

[0184] 111B, 112B First Through Hole

[0185] 111C, 112C Second Through Hole

[0186] 113 Screws

[0187] 121, 122 racks

[0188] 121A, 122A rack teeth

[0189] 123 Small Gear

[0190] 130 center block

[0191] 131 Capacity

[0192] 132A First Through Hole

[0193] 132B Second Through Hole

[0194] 133A, 133B Support Holes

[0195] 140 positioning plate

[0196] 141 Retaining Hole

[0197] 142A, 142B Support Holes

[0198] 143. Groove

[0199] Sales of 151 and 152

[0200] 161, 162 V-shaped bushings

[0201] 161A and 162A support surfaces

[0202] 200 Analog Instruments

[0203] 201 Casing

[0204] 202 Display Surface

[0205] 203 pointers

[0206] 203A Rotary Shaft

[0207] 204 magnet

[0208] 210 Protective Glass

[0209] 210A surface

[0210] 212 Outer Frame

[0211] 212A outer peripheral surface

[0212] 220 Wireless Communication Device

[0213] 230° Rotation Angle Transmitter

[0214] 300 sensor units

[0215] 301 Sensor Housing

[0216] 302 Magnetic Sensor

[0217] 303 cable

Claims

1. A magnet fixing component, assembled at the rotation center of a pointer in an analog instrument, for fixing a magnet used for detecting rotation angle, characterized in that, have: Main body; A magnet holding part is provided on the upper surface of the main body to hold the magnet above the pointer; The slit portion is formed in the main body as a plane orthogonal to the rotation center of the pointer, and accommodates the rotation center of the pointer. A rotation shaft retaining part, located on the lower side of the main body and the slit portion, retains the rotation shaft of the pointer; and A pointer limiting part is provided protruding outward from the outer periphery of the main body to limit the rotation of the pointer relative to the main body.

2. The magnet fastener according to claim 1, characterized in that, The main body has a first elastic beam and a second elastic beam disposed opposite to each other on the lower side of the gap. The aforementioned rotating shaft holding portion is provided between the aforementioned first elastic beam portion and the aforementioned second elastic beam portion, thereby holding the aforementioned rotating shaft portion by clamping the aforementioned rotating shaft portion between the aforementioned first elastic beam portion and the aforementioned second elastic beam portion.

3. The magnet fastener according to claim 2, characterized in that, The main body has a guide portion between the first elastic beam portion and the second elastic beam portion. The guide portion extends in such a way that its width gradually narrows from the outer periphery of the main body portion toward the rotating shaft holding portion, guiding the rotating shaft portion toward the rotating shaft holding portion.

4. The magnet fastener according to any one of claims 1 to 3, characterized in that, The aforementioned pointer limiting part has: A protrusion is provided that protrudes from the outer periphery of the main body towards the long dimension of the pointer; and The tongue portion extends from the aforementioned protrusion in the width direction of the pointer and is capable of elastic deformation in a direction parallel to the aforementioned rotation center to press the pointer firmly.

5. The magnet fastener according to claim 4, characterized in that, The aforementioned tongue portion is inclined from the aforementioned protrusion, with the gap between it and the aforementioned protrusion gradually widening in a direction parallel to the aforementioned rotation center. The pointer limiting portion holds the two ends of the pointer disposed in the gap in the width direction by the first abutting surface of the protrusion exposed in the gap and the second abutting surface of the tongue exposed in the gap.

6. The magnet fastener according to any one of claims 1 to 3, characterized in that, The aforementioned slit portion has an opening at the outer periphery of the aforementioned main body portion, which allows the rotation center portion of the aforementioned pointer to slide from the opening portion in a direction orthogonal to the aforementioned rotation center, thereby accommodating the rotation center portion of the aforementioned pointer within the slit portion.

7. The magnet fastener according to any one of claims 1 to 3, characterized in that, The magnet fastener is integrally formed using a flexible resin material.

8. The magnet fastener according to claim 7, characterized in that, The magnet fastener is formed by injection molding the aforementioned resin raw material.

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