Rotation detection mechanism and display screen assembly

Abstract

The utility model discloses a rotation detection mechanism and a display screen assembly, the rotation detection mechanism is applied to a display screen, the rotation detection mechanism comprises a magnet part and a magnetic induction part which are arranged at an interval, the magnet part comprises at least one pair of poles magnetized in the radial direction, the magnetic induction part is located on the central axis of the magnet part, and the magnet part is connected with the display screen. The magnet part is configured to rotate around the central axis along with rotation of the display screen, and the magnet part and the magnetic induction part are both located on the radial outer side of the rotation axis of the display screen. According to the scheme, the magnetic induction part is arranged on the central axis of the magnet part and is spaced from the magnet part, so that compared with the traditional magnetic ring and the magnetic induction part which are laterally arranged, the cost can be reduced, and the detection result of the rotation position of the display screen is more accurate; and the overall length of an overall structure formed by the display screen and the rotation detection mechanism in the axial direction of the display screen is not increased, so that the overall structure can be conveniently arranged in a limited space.

Description

Technical Field

[0001] The present application relates to the field of magnetic induction detection technology, and in particular to a rotation detection mechanism and a display screen assembly. Background Art

[0002] Now more and more cars are equipped with on-board motion screens, and the actuator for flipping the screen requires a drive system as a basis. This drive system not only needs to provide power and support for the flipping of the screen, but also needs to accurately control the position of the screen. The precise control of the screen position requires the use of a magnetic angle encoder.

[0003] At present, the installation structure of the magnetic angle encoder of most vehicle-mounted motion screens is as follows: the encoder is installed and fixed on the outside of the reducer housing, and then a magnetic ring is installed on the output shaft of the reducer. The sensor side of the magnetic encoder faces the magnetic ring (the sensor is located at a certain distance radially outside the magnetic ring). When the magnetic ring rotates synchronously with the output shaft, the sensor on the encoder can detect the rotation angle and rotation speed of the output shaft, thereby sensing the specific position of the screen.

[0004] This type of magnetic encoder installation has poor detection accuracy because the magnetic ring and the sensor are facing each other sideways, and the sensor is not on the central axis of the output shaft and the magnetic ring. In addition, the magnetic ring needs to be installed on the output shaft. A special magnetic ring fixing frame needs to be designed and accurately installed on the output shaft, otherwise the detection accuracy will be poor, so the processing and installation costs are relatively high. The cost of the magnetic ring itself is also relatively high compared to ordinary magnets. Utility Model Content

[0005] The present application provides a rotation detection mechanism and a display screen assembly to solve the problems of high magnetic ring installation cost and poor detection accuracy due to the side alignment of the magnetic ring and the sensor in the existing magnetic encoder installation method.

[0006] In order to solve the above technical problems, the technical solution provided by this application is:

[0007] A rotation detection mechanism is applied to a display screen. The rotation detection mechanism includes a magnet part and a magnetic induction part which are arranged at intervals. The magnet part includes at least one pair of radially magnetized poles. The magnetic induction part is located on the central axis of the magnet part. The magnet part is connected to the display screen. The magnet part is configured to rotate around the central axis as the display screen rotates. The magnet part and the magnetic induction part are both located radially outside the rotation axis of the display screen.

[0008] Furthermore, the rotation detection mechanism also includes a driven shaft, which includes a first connecting portion and a second connecting portion arranged along its axial direction, the first connecting portion is used to be fixedly connected to the display screen, and the axis of the driven shaft coincides with the rotation axis of the display screen, and the magnet part rotates with the rotation of the driven shaft.

[0009] Furthermore, the rotation detection mechanism also includes a first gear fixedly mounted on the driven shaft and a second gear located radially outside the driven shaft, the second gear is engaged with the first gear, and the magnet portion is coaxially fixed to the second gear.

[0010] Furthermore, the rotation detection mechanism also includes a shell mounted on the driven shaft, the magnet part, the magnetic induction part, the first gear and the second gear are all located in the shell, the magnetic induction part is fixed in the shell, the second gear is rotatably connected in the shell, the driven shaft passes through the shell, the first connecting part of the driven shaft is located outside the shell, and the second connecting part of the driven shaft is located in the shell and is rotatably connected to the shell.

[0011] Furthermore, the rotation detection mechanism also includes an encoder fixing seat, a first positioning sleeve and a PCB board, the first positioning sleeve is fixed to the inner wall of the shell, the encoder fixing seat is fixed to the first positioning sleeve and together with the first positioning sleeve defines a cavity, the PCB board is positioned in the cavity and fixed to the encoder fixing seat, the encoder fixing seat is provided with a through hole, the magnetic induction part is fixed to the PCB board and exposed to the through hole to be opposite to the magnetic part.

[0012] Furthermore, a second positioning sleeve is provided on the end surface of the second gear facing the magnetic induction part, and the magnet part is positioned on the second positioning sleeve.

[0013] Furthermore, a third positioning sleeve is provided at the through hole of the encoder fixing seat, the magnetic induction part is located on the central axis of the third positioning sleeve, the second positioning sleeve and the third positioning sleeve are coaxially sleeved, and a fourth positioning sleeve is also provided in the shell body. The end face of the second gear facing away from the first positioning sleeve is coaxially fixedly connected with a positioning column, and the positioning column is positioned on the fourth positioning sleeve and can rotate relative to the fourth positioning sleeve.

[0014] Further, the magnet part and the magnetic induction part are located on a side of the second gear that is closer to the first connecting portion of the driven shaft along the axial direction of the second gear.

[0015] Furthermore, two ends of the display screen along its rotation axis direction include a driving end and a driven end, the driving end is used to connect to an external driving mechanism to rotate the display screen, and the rotation detection mechanism is arranged at the driven end of the display screen.

[0016] The present application also provides a display screen assembly, including a display screen and the above-mentioned rotation detection mechanism.

[0017] The beneficial effects of this application are:

[0018] The rotation detection mechanism provided by the present application is applied to a display screen, and includes a magnet part and a magnetic induction part. The magnet part is used to generate magnetic flux lines, and the magnetic induction part is used to detect the rotation position of the magnet part according to the magnetic flux lines. Since the magnet part includes at least one pair of radially magnetized poles, and the magnetic induction part is located on the central axis of the magnet part, when the magnet part rotates, the magnetic induction part can respond to the change in the direction of the magnetic flux lines of the magnet part to detect the rotation position of the magnet part, and the rotation of the magnet part is driven by the rotation of the display screen, so the rotation position of the display screen can be indirectly measured by measuring the rotation position of the magnet part. The present application improves the traditional magnetic ring into a magnet including at least one pair of radially magnetized poles, and its cost is reduced, and the lateral arrangement of the traditional magnetic ring and the sensor is improved to axial alignment, and the rotation position of the magnet part can be detected by sensing the change in the direction of the magnetic flux lines of the magnet part, and the detection result is more accurate. In addition, since the magnet part and the magnetic sensing part are both located radially outside the rotation axis of the display screen, the overall length of the overall structure composed of the display screen and the rotation detection mechanism along the axial direction of the display screen will not be increased, which facilitates the arrangement of the overall structure in a limited space. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0020] Figure 1 is a cross-sectional schematic diagram of an embodiment of a rotation detection mechanism provided by the present application;

[0021] Figure 2 This is an assembly diagram of a first embodiment of a rotation detection mechanism provided by the present application installed on a display screen;

[0022] Figure 3 This is an assembly diagram of a second embodiment of the rotation detection mechanism provided by the present application being installed on a display screen;

[0023] Figure 4 yes Figure 1 The enlarged image in the middle dashed box;

[0024] Figure 5 yes Figure 4 A three-dimensional schematic diagram of the middle magnet part and the magnetic induction part;

[0025] Figure 6 This is a front view of an embodiment of the rotation detection mechanism provided by the present application installed on a display screen;

[0026] Figure 7yes Figure 6 A three-dimensional schematic diagram of

[0027] Figure 8 is a three-dimensional schematic diagram of another embodiment of the rotation detection mechanism provided by the present application;

[0028] Fig. 9 yes Figure 8 A three-dimensional schematic diagram of the internal structure of the rotation detection mechanism.

[0029] Description of reference numerals:

[0030] Display 100

[0031] Drive end 101

[0032] Driven end 102

[0033] Rotation detection mechanism 200

[0034] Magnet part 2101

[0035] Magnetic induction part 2102

[0036] Gap 2103

[0037] Driven shaft 211

[0038] First connection portion 211a

[0039] Second connection portion 211b

[0040] Bearing 2110

[0041] First gear 212

[0042] Second gear 213

[0043] PCB board 214

[0044] Encoder fixing seat 215

[0045] First positioning sleeve 216

[0046] Second positioning sleeve 217

[0047] The third positioning sleeve 218

[0048] Positioning column 219

[0049] Fourth positioning sleeve 220

[0050] Housing 221

[0051] Cover 222

[0052] Cover 223

[0053] Connecting frame 202

[0054] Lamination Department 2021

[0055] Fixing hole 2021a

[0056] Bending section 2022

[0057] External drive mechanism 300

[0058] Fixing member 400

[0059] Rotation axis R1

[0060] Center axis R 21

[0061] Center axis R 22 DETAILED DESCRIPTION

[0062] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0063] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0064] This application provides a rotation detection mechanism, see Figure 1 , Figure 1 is a cross-sectional schematic diagram of an embodiment of a rotation detection mechanism provided by the present application. The rotation detection mechanism 200 is applied to a display screen. Figure 2 and Figure 3 , Figure 2 is an assembly diagram of a first embodiment of a rotation detection mechanism provided by the present application installed on a display screen, Figure 3 1 is an assembly diagram of a second embodiment of the rotation detection mechanism provided by the present application installed on a display screen. The display screen 100 is a rotatable display screen, exemplarily, a vehicle-mounted folding screen, or any other rotatable screen with a display function. The rotation detection mechanism 200 is used to detect the rotation position (i.e., the rotation angle) of the display screen 100.

[0065] See also Figure 4 , Figure 4 yes Figure 1The enlarged image in the dashed box, combined with Figure 2 and Figure 3 The rotation detection mechanism 200 includes a magnet portion 2101 and a magnetic induction portion 2102 arranged at intervals. The magnet portion 2101 includes at least one pair of radially magnetized poles. The magnetic induction portion 2102 is located at the central axis R of the magnet portion 2101. 22 The magnet part 2101 is connected to the display screen 100, and the magnet part 2101 is configured to rotate with the display screen 100 around the central axis R 22 The magnet part 2101 and the magnetic induction part 2102 are both located radially outside the rotation axis R1 of the display screen 100, that is, the central axis R1 of the magnet part 2101. 22 It is arranged parallel to the rotation axis R1 of the display screen 100 .

[0066] It can be seen that the rotation detection mechanism 200 in the present application includes a magnet part 2101 and a magnetic induction part 2102. The magnet part 2101 is used to generate magnetic flux lines, and the magnetic induction part 2102 is used to detect the rotation position (i.e., rotation angle) of the magnet part 2101 according to the magnetic flux lines. Since the magnet part 2101 includes at least one pair of radially magnetized poles, and the magnetic induction part 2102 is located at the central axis R of the magnet part 2101 22 Therefore, when the magnet part 2101 rotates relative to the magnetic sensing part 2102, the magnetic sensing part 2102 can respond to the change in the direction of the magnetic flux lines of the magnet part 2101 to detect the rotation position of the magnet part 2101, and the rotation of the magnet part 2101 is driven by the rotation of the display screen 100, so the rotation position of the display screen 100 can be indirectly measured by measuring the rotation position of the magnet part 2101. The present application improves the traditional magnetic ring into a magnet including at least one pair of poles with radial magnetization, and its cost is reduced, and the lateral arrangement of the traditional magnetic ring and the sensor (such as the Hall element) (the Hall element is located radially outside the magnetic ring) is improved to axial alignment, and the rotation position of the magnet part 2101 can be detected by sensing the change in the direction of the magnetic flux lines of the magnet part 2101, and the detection result is more accurate. In addition, since the magnet part 2101 and the magnetic sensing part 2102 are both located radially outside the rotation axis R1 of the display screen 100, the overall length of the overall structure formed by the display screen 100 and the rotation detection mechanism 200 along the axial direction of the display screen 100 will not be increased, which facilitates the arrangement of the overall structure in a limited space.

[0067] See also Figure 5 , Figure 5A three-dimensional schematic diagram of a magnet part 2101 and a magnetic induction part 2102 is shown. The magnet part 2101 is in the shape of an oblate cylinder. The magnet part 2101 is a pair of radially magnetized magnets. The magnetic induction part 2102 is preferably a magnetic induction chip (IC). For example, a chip of the MT6835 model can be selected. The chip is an angle encoder chip based on anisotropic magnetoresistive (AMR) technology. The magnetic induction part 2102 can respond to changes in the direction of a magnetic field parallel to its surface. Therefore, when the magnet part 2101 rotates, the magnetic induction part 2102 can detect the angular position of the magnet part 2101.

[0068] The diameter (Dmag) of the magnet part 2101 is 4-16mm, preferably 10mm; the thickness (Tmag) of the magnet part 2101 is 1-4mm, preferably 2.5mm; the input magnetic field (Bpk) of the magnet part 2101 is 30-1000mT, wherein the input magnetic field is parallel to the horizontal direction of the surface of the magnetic induction part 2102, and is measured on the surface of the magnetic induction part 2102; the rotation speed (RS) of the magnet part 2101 is at most 120000RPM (revolutions per minute); the temperature coefficient (TCmag) of the magnet part 2101, the neodymium iron boron magnet is preferably -0.12% / ℃, and the samarium cobalt magnet is preferably -0.035% / ℃.

[0069] The gap 2103 (AG) between the magnet part 2101 and the magnetic sensing part 2102 is 1-3 mm, preferably 1 mm, and the maximum is 3 mm. The gap 2103 should be as small as possible to obtain the best detection performance. When the gap 2103 is large, the magnetic field is weakened, thereby deteriorating the detection performance. The central axis R of the magnet part 2101 22 The sensing center of the magnetic sensing part 2102 should be aligned, and the eccentricity (DISP) of the two should not exceed 0.3mm. Avoid eccentricity as much as possible during installation. The deterioration of detection performance caused by larger eccentricity and larger gap 2103 is more obvious for magnets with smaller diameters.

[0070] The relative connection position between the rotation detection mechanism 200 and the display screen 100 is described in detail below.

[0071] See also Figure 6 and Figure 7 , Figure 6 yes Figure 1 A front view of an embodiment of a rotation detection mechanism mounted on a display screen, Figure 7 yes Figure 6 3D schematic diagram, the two ends of the display screen 100 along the direction of the rotation axis R1 include a driving end 101 and a driven end 102, the driving end 101 is used to connect to the external driving mechanism 300 to rotate the display screen 100, and the rotation detection mechanism 200 is arranged at the driven end 102 of the display screen 100, Figure 2 and Figure 3 Two different structures are shown in which the rotation detection mechanism 200 is arranged at the driven end 102 of the display screen 100. Optionally, the external driving mechanism 300 uses a structure in which a motor and a gear reduction mechanism cooperate to drive the display screen 100 to rotate. The present application is not limited to the rotation detection mechanism 200 being arranged at the driven end 102 of the display screen 100. According to the aforementioned principle that the rotation of the display screen 100 drives the magnet part 2101 to rotate, as long as the function of the display screen 100 driving the magnet part 2101 can be realized, the position of the magnet part 2101 relative to the display screen 100 can be arbitrary, that is, the position of the rotation detection mechanism 200 relative to the display screen 100 is arbitrary.

[0072] Figure 6 and Figure 7 The structure of the rotation detection mechanism 200 disposed at the driven end 102 of the display screen 100 is shown. This embodiment uses this structure to specifically explain the principle that the display screen 100 rotates around its rotation axis R1 to drive the magnet part 2101 to rotate to achieve the angular position detection of the display screen 100. Figure 1 and Figure 4 The rotation detection mechanism 200 of the present embodiment further includes a driven shaft 211, the driven shaft 211 includes a first connecting portion 211a and a second connecting portion 211b arranged along its axial direction, the first connecting portion 211a of the driven shaft 211 is used to be fixedly connected to the driven end 102 of the display screen 100, and the central axis R of the driven shaft 211 21 The magnet part 2101 coincides with the rotation axis R1 of the display screen 100, and rotates with the rotation of the driven shaft 211. The display screen 100 is fixedly connected to the driven shaft 211, and the magnet part 2101 is driven to rotate by the driven shaft 211, which facilitates the installation of the magnet part 2101 and the magnetic induction part 2102, and can prevent the magnet part 2101 and the magnetic induction part 2102 from affecting the rotation of the display screen 100.

[0073] The present application does not specifically limit the method of fixed connection between the driven shaft 211 and the display screen 100. The fixed connection method can be bonding or connecting with fasteners such as screws. The driven shaft 211 and the display screen 100 can be directly connected or connected through an intermediate connecting member.

[0074] The present embodiment does not specifically limit the relative position between the driven shaft 211 and the display screen 100. The end surface of the driven shaft 211 may be fixedly connected to the end surface of the display screen 100 along the rotation axis R1. Figure 3 The structure shown in FIG. 1 may also be that the orthographic projection of the driven shaft 211 on the display screen 100 partially or completely overlaps with the display screen 100 ( Figure 2Furthermore, the rotation detection mechanism 200 may be located as a whole on the outside of the display screen 100 in the direction of the rotation axis R1, or the orthographic projection of the rotation detection mechanism 200 as a whole on the display screen 100 may partially or completely overlap with the display screen 100. In order to reduce the axial dimension of the overall structure formed by the display screen 100 and the rotation detection mechanism 200, the portion of the rotation detection mechanism 200 located on the outside of the display screen 100 in the direction of the rotation axis R1 may be reduced as much as possible.

[0075] Below Figure 8 and Fig. 9 The embodiment of the connection structure of the driven shaft 211 installed on the driven end 102 of the display screen 100 is specifically introduced. In this embodiment, the rotation detection mechanism 200 also includes a connecting frame 202, and the connecting frame 202 includes a fitting portion 2021 and a bending portion 2022. The fitting portion 2021 is used to fit and fix the display screen 100. The bending portion 2022 is bent in a direction perpendicular to the rotation axis R1 relative to the fitting portion 2021 in a direction away from the display screen 100. The driven shaft 211 (specifically, the first connecting portion 211a of the driven shaft 211) is fixedly connected to the bending portion 2022. The fitting portion 2021 is provided with a fixing hole 2021a, and a fastener is inserted through the fixing hole 2021a and connected to the display screen 100 to achieve the connection and fixation between the fitting portion 2021 and the display screen 100. The fastener can be a screw or a bolt. In other embodiments, the fitting portion 2021 can also be fixed to the display screen 100 by other methods such as bonding or welding. It should be noted that the display screen 100 usually includes a front side and a back side, the front side is the display surface, and the bonding portion 2021 can be fixed on the back side of the display screen 100 to avoid affecting the display effect on the front side of the display screen 100. Of course, the situation where the bonding portion 2021 is fixed on the front side of the display screen 100 is not ruled out.

[0076] In some embodiments, the rotation detection mechanism 200 further includes a first gear 212 fixedly mounted on the driven shaft 211 and a second gear 213 located radially outside the driven shaft 211, the second gear 213 is engaged with the first gear 212, and the magnet part 2101 is coaxially fixed to the second gear 213. When the driven shaft 211 rotates with the display screen 100, the first gear 212 fixed on the driven shaft 211 is driven to rotate, and the second gear 213 is driven to rotate by the engagement of the first gear 212 and the second gear 213, thereby driving the magnet part 2101 coaxially fixed with the second gear 213 to rotate. In this embodiment, the magnet part 2101 and the magnetic induction part 2102 are arranged radially outside the driven shaft 211, which can reduce the overall length of the overall structure formed by the display screen 100 and the rotation detection mechanism 200 along the axial direction of the display screen 100, and facilitate the arrangement of the overall structure in a limited space.

[0077] The second gear 213 is engaged with the first gear 212. Preferably, the first gear 212 and the second gear 213 are directly meshed to reduce the number of parts of the present application and save costs, but it is not limited to the structure in which the two are directly meshed. The two can also be meshed through a number of intermediate gears.

[0078] The rotational angular speeds of the first gear 212 and the second gear 213 are preferably the same, that is, the transmission ratio of the first gear 212 and the second gear 213 is one. When the first gear 212 and the second gear 213 are directly meshed, the gear diameters of the two are the same, so the rotational angular speeds of the two are the same, that is, when the display screen 100 rotates by one angle, it can drive the magnet part 2101 to rotate by the same angle, so the measured rotation angle of the magnet part 2101 is the rotation angle of the display screen 100. The gear diameters of the first gear 212 and the second gear 213 can also be different. When the first gear 212 rotates, it drives the second gear 213 to speed up or slow down, that is, when the display screen 100 rotates by one angle, the corresponding rotation angle of the magnet part 2101 is greater than or less than the rotation angle of the display screen 100. It is necessary to convert the actual rotation angle of the display screen 100 according to the ratio of the gear diameters of the first gear 212 and the second gear 213.

[0079] For further information, see Figure 4 as well as Figures 6 to 9 The rotation detection mechanism 200 further includes a housing 221 sleeved on the driven shaft 211, and the housing 221 is used to be fixed to a fixed member, which may be Figure 6 and Figure 7 The fixed member 400 is a member fixed relative to the display screen 100. For example, the fixed member 400 may be a car chassis, and the display screen 100 may rotate relative to the fixed member 400. The magnet part 2101, the magnetic induction part 2102, the first gear 212 and the second gear 213 are all located in the housing 221. The housing 221 can surround the magnet part 2101, the magnetic induction part 2102, the first gear 212 and the second gear 213 to prevent them from being exposed. The magnetic induction part 2102 is fixed in the housing 221, and the magnet part 2101, the first gear 212 and the second gear 213 are all rotatably connected relative to the housing 221.

[0080] The driven shaft 211 (specifically, the second connection portion 211b of the driven shaft 211) passes through the housing 221 and can rotate relative to the housing 221. The first connection portion 211a of the driven shaft 211 is located outside the housing 221, and the second connection portion 211b is the portion of the driven shaft 211 located in the housing 221. Since the driven shaft 211 is rotatably connected to the housing 221, the housing 221 can be used as a supporting component of the driven shaft 211 to prevent the end of the driven shaft 211 away from the display screen 100 from being suspended in the air and increasing the deformation of the driven shaft 211. The driven shaft 211 is provided with bearings 2110 on both axial sides of the first gear 212, and the driven shaft 211 is installed in the housing 221 through the bearings 2110.

[0081] To facilitate installation of components in the housing 221 , the housing 221 includes a cover body 223 and a cover body 222 that are detachably connected. One end face of the cover body 222 is open, and the cover body 223 is arranged to cover the opening to realize assembly and disassembly of the housing 221 .

[0082] In some embodiments, the magnet portion 2101 and the magnetic induction portion 2102 are located on the side of the first connecting portion 211a of the second gear 213 that is closer to the driven shaft 211 along its axial direction, that is, the magnet portion 2101 and the magnetic induction portion 2102 are located on the side of the second gear 213 facing the cover body 223, which can further reduce the axial dimension of the rotation detection mechanism 200.

[0083] Furthermore, in order to realize the installation and fixation of the magnetic sensing part 2102 in the housing 221, the rotation detection mechanism 200 of the present embodiment further includes an encoder fixing seat 215, a first positioning sleeve 216 and a PCB board 214. The first positioning sleeve 216 is fixed to the inner wall of the housing 221, and specifically, the first positioning sleeve 216 is fixed to the inner wall of the cover body 223. The encoder fixing seat 215 is clamped on the first positioning sleeve 216 and defines a cavity together with the first positioning sleeve 216. The PCB board 214 is positioned in the cavity and fixed to the encoder fixing seat 215. The encoder fixing seat 215 is provided with a through hole. The magnetic sensing part 2102 is fixed to the PCB board 214, exposed to the through hole and opposite to the magnetic part 2101 to sense the magnetic flux lines generated by the magnetic part 2101. Since the magnetic induction part 2102 is usually pre-installed on the PCB board 214 , the magnetic induction part 2102 is positioned in the housing 221 after the PCB board 214 is positioned in the first positioning sleeve 216 .

[0084] To facilitate the positioning of the magnet part 2101 on the second gear 213 , in this embodiment, a second positioning sleeve 217 is provided on the end surface of the second gear 213 facing the magnetic induction part 2102 , and the magnet part 2101 is positioned in the second positioning sleeve 217 .

[0085] In order to facilitate the installation of the second gear 213 in the housing 221, the encoder fixing seat 215 is provided with a third positioning sleeve 218 at the above-mentioned through hole, the magnetic induction part 2102 is located on the central axis of the third positioning sleeve 218, and the second positioning sleeve 217 is coaxially sleeved with the third positioning sleeve 218. A fourth positioning sleeve 220 is also provided in the housing 221. Specifically, the fourth positioning sleeve 220 is fixed to the inner wall of the cover 222, and the end surface of the second gear 213 facing away from the first positioning sleeve 216 is coaxially fixedly connected with a positioning column 219, and the positioning column 219 is positioned on the fourth positioning sleeve 220 and can rotate relative to the fourth positioning sleeve 220. Therefore, the second gear 213 along its axial side is supported at both ends by the rotational cooperation of the second positioning sleeve 217 and the third positioning sleeve 218, and the other side is supported by the rotational cooperation of the positioning column 219 and the fourth positioning sleeve 220, so as to realize the rotation of the second gear 213 relative to the housing 221. At the same time, after the PCB board 214 is installed in the first positioning sleeve 216, the magnetic induction part 2102 is exactly located on the central axis of the third positioning sleeve 218. After the magnet part 2101 is installed in the second positioning sleeve 217, the magnet part 2101 is exactly located on the central axis of the second positioning sleeve 217. The second positioning sleeve 217 and the third positioning sleeve 218 are coaxially sleeved. Therefore, when the second positioning sleeve 217 and the third positioning sleeve 218 are coaxially sleeved, the magnetic induction part 2102 and the central axis R of the magnet part 2101 are exactly located on the central axis R of the second positioning sleeve 217. 22 Automatic alignment.

[0086] In summary, the present application sets the magnetic induction part 2102 on the central axis R of the magnet part 2101. 22 The arrangement of the upper and spaced magnetic part 2101 can reduce costs and provide a more accurate detection result of the rotation position of the display screen 100 compared to the traditional lateral arrangement of the magnetic ring and the sensor.

[0087] The present application also provides a display screen assembly, which includes a display screen and the above-mentioned rotation detection mechanism. The specific structure of the rotation detection mechanism and the connection structure between the rotation detection mechanism and the display screen refer to the above-mentioned embodiment. Since the present display screen assembly adopts all the technical solutions of the above-mentioned embodiment, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiment, which will not be repeated here. Among them, the display screen can be a vehicle-mounted folding screen or any other screen that can rotate and has a display function.

[0088] The terms "first", "second", "third" in this application are only used for descriptive purposes and cannot be understood as indicating the quantity of the indicated technical features. Thus, the features defined as "first", "second", "third" can expressly or implicitly include at least one of these features. In the embodiments of the present application, all directional indications (such as up, down, left, right, front, back ...) are only used to explain the relative positional relationship, motion conditions, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "include" and "have" and any of their variations are intended to cover non-exclusive inclusions. The process, method, system, product or equipment such as including a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or equipment.

[0089] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A rotation detection mechanism, It is characterized in that Applied to a display screen, the rotation detection mechanism includes a magnet part and a magnetic induction part arranged at intervals, the magnet part includes at least one pair of radially magnetized poles, the magnetic induction part is located on the central axis of the magnet part, the magnet part is connected to the display screen, the magnet part is configured to rotate around the central axis as the display screen rotates, and the magnet part and the magnetic induction part are both located radially outside the rotation axis of the display screen.

2. The rotation detection mechanism according to claim 1, It is characterized in that The rotation detection mechanism also includes a driven shaft, which includes a first connecting portion and a second connecting portion arranged along its axial direction. The first connecting portion is used to be fixedly connected to the display screen, and the axis of the driven shaft coincides with the rotation axis of the display screen. The magnet portion rotates with the rotation of the driven shaft.

3. The rotation detection mechanism according to claim 2, It is characterized in that The rotation detection mechanism further includes a first gear fixedly sleeved on the driven shaft and a second gear located radially outside the driven shaft, the second gear is engaged with the first gear, and the magnet portion is coaxially fixed to the second gear.

4. The rotation detection mechanism according to claim 3, It is characterized in that The rotation detection mechanism also includes a shell sleeved on the driven shaft, the magnet part, the magnetic induction part, the first gear and the second gear are all located in the shell, the magnetic induction part is fixed in the shell, the second gear is rotatably connected in the shell, the driven shaft penetrates into the shell, the first connecting part of the driven shaft is located outside the shell, and the second connecting part of the driven shaft is located in the shell and rotatably connected to the shell.

5. The rotation detection mechanism according to claim 4, It is characterized in that The rotation detection mechanism also includes an encoder fixing seat, a first positioning sleeve and a PCB board, the first positioning sleeve is fixed to the inner wall of the shell, the encoder fixing seat is fixed to the first positioning sleeve and defines a cavity together with the first positioning sleeve, the PCB board is positioned in the cavity and fixed to the encoder fixing seat, the encoder fixing seat is provided with a through hole, the magnetic induction part is fixed to the PCB board and exposed to the through hole to be opposite to the magnetic part.

6. The rotation detection mechanism according to claim 5, It is characterized in that A second positioning sleeve is provided on the end surface of the second gear facing the magnetic induction part, and the magnet part is positioned on the second positioning sleeve.

7. The rotation detection mechanism according to claim 6, It is characterized in that The encoder fixing seat is provided with a third positioning sleeve at the through hole, the magnetic induction part is located on the central axis of the third positioning sleeve, the second positioning sleeve is coaxially sleeved with the third positioning sleeve, and a fourth positioning sleeve is also provided in the shell. The end face of the second gear facing away from the first positioning sleeve is coaxially fixedly connected with a positioning column, and the positioning column is positioned on the fourth positioning sleeve and can rotate relative to the fourth positioning sleeve.

8. The rotation detection mechanism according to claim 4, It is characterized in that The magnet portion and the magnetic induction portion are located on a side of the second gear that is closer to the first connecting portion of the driven shaft in the axial direction of the second gear.

9. The rotation detection mechanism according to claim 1, It is characterized in that The two ends of the display screen along the rotation axis direction thereof include a driving end and a driven end. The driving end is used to connect to an external driving mechanism to rotate the display screen. The rotation detection mechanism is arranged at the driven end of the display screen.

10. A display screen assembly, It is characterized in that The invention comprises a display screen and a rotation detection mechanism as claimed in any one of claims 1 to 9.

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