Patent Publication Number: US-2021165301-A1

Title: Flip device and camera with flip device

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is a continuation of International Application No. PCT/CN2018/103653, filed on Aug. 31, 2018, the entire content of which is incorporated herein by reference. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to the field of cameras and, more particularly to a flip device and a camera with the flip device. 
     BACKGROUND 
     In the camera industry, when a screen is used for view finding, in order to facilitate users to view from different shooting angles, the camera is provided with a flip-screen, and a certain angle can be formed between the flip screen and the camera body. However, usually the flip-screen can only be fixed at a certain angle. When the user uses the camera screen to check the view and requires viewing from multiple angles, the user cannot look straight at the camera screen at this angle, therefore the visual effect and user experience are poor. 
     SUMMARY 
     In accordance with the disclosure, there is provided a flip device including a bracket including a first limit member, a positioning and connection assembly including a second limit member, and a rotation-shaft rocker arm rotatably connected to the bracket through the positioning and connection assembly. The first limit member and the second limit member are configured to mate with each other to enable the rotation-shaft rocker arm and the bracket to be fixed relative to each other at a preset angle. 
     Also in accordance with the disclosure, there is provided a camera including a camera body, a screen, and a flip device. The flip device includes a bracket connected to the screen and including a first limit member, a positioning and connection assembly including a second limit member, and a rotation-shaft rocker arm connected to the camera body and rotatably connected to the bracket through the positioning and connection assembly. The first limit member and the second limit member are configured to mate with each other to enable the rotation-shaft rocker arm and the bracket to be fixed relative to each other at a preset angle. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above-described and/or additional aspects and advantages of this disclosure will become obvious and easy to understand from the description of the embodiments with reference to the following accompanying drawings. 
         FIG. 1  is a schematic structural diagram of a flip device according to an embodiment of the disclosure. 
         FIG. 2  is a schematic exploded view of the flip device in  FIG. 1 . 
         FIG. 3  is a schematic structural diagram showing shapes of a first hole, a second hole, a third hole, and a fourth hole according to an embodiment of the disclosure. 
         FIG. 4  is a schematic enlarged structural diagram of a part of the flip device in  FIG. 2 . 
         FIG. 5  is a schematic structural diagram of a camera according to an embodiment of the disclosure. 
         FIGS. 6-8  are schematic diagrams showing application scenarios of the camera at different angles according to embodiments of the disclosure. 
     
    
    
     REFERENCE NUMERALS 
       100 —Flip Device  10 —Bracket  11 —First Limit Member  111 —Third Hole  112 —First Limit Portion  1121 —Limit Slot  113 —First Limit Surface  12 —Body  121 —First Side  122 —Second Side  13 —Accommodation Slot  20 —Rotation-Shaft Rocker Arm  21 —One End  22 —Other End  23 —Side Wall  24 —Connection Portion  25 —Fourth Hole  30 —Positioning and Connection assembly  31 —Second Limit Member  311 —Second Hole  312 —Second Limit Portion  3121 —Protrusion  313 —Second Limit Surface  32 —Fastener  321 —Shaft Portion  322 —End Portion  33 —Elastic Member  331 —Elastic Sheet  332 —First Hole  1000 —Camera  200 —Camera Body  201 —Receiving Slot  300 —Screen 
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     The embodiments of the present disclosure are described as follows in detail, and examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. The following embodiments described with reference to the accompanying drawings are exemplary, and are only used to explain the disclosure and should not be understood as a limitation to the disclosure. 
     Referring to  FIGS. 1 and 2 , a flip device  100  according to an embodiment of the disclosure includes a bracket  10 , a rotation-shaft rocker arm  20  and a positioning and connection assembly  30 . The bracket  10  include a first limit member  11 . The positioning and connection assembly  30  includes a second limit member  31  for mating with the first limit member  11 . The rotation-shaft rocker arm  20  is rotatably connected with the support  10  through the positioning and connection assembly  30 . The first limit member  11  mates with the second limit member  31  to enable the rotation-shaft rocker arm  20  and the bracket  10  to be fixed relative to each other at a preset angle. 
     Specifically, the flip device  100  of the embodiments of the present disclosure can be applied to a structure that requires angle adjustment, such as an angle adjustment between a camera body  200  and a screen  300  of a camera  1000  shown in  FIG. 5 , and an angle adjustment between a display screen of a display and a base, and so on. The camera  1000  is used as an example in this disclosure. 
     The first limit member  11  is disposed at the bracket  10 . The first limit member  11  is fixedly connected to the bracket  10 , for example, by welding or integral molding. The bracket  10  includes a body  12 , and the body  12  includes a first side  121  (as shown in  FIG. 4 ) and a second side  122  opposite to each other. The first side  121  of the body  12  can be used to carry objects, such as the screen  300  of the camera  1000  shown in  FIG. 5 , so as to adjust the angle between the screen  300  and the camera body  200 . When the bracket  10  is connected to the rotation-shaft rocker arm  20 , the rotation-shaft rocker arm  20  may be disposed at the second side  122 . 
     The rotation-shaft rocker arm  20  includes two opposite ends. One end  21  is rotatably connected to the bracket  10 , and the other end  22  can be a free end, or can be fixedly connected to other devices, such as the camera body  200  of the camera  1000  shown in  FIG. 4 . The rotation-shaft rocker arm  20  may be in a shape of a separate rod or in a shape of a flat plate. In the embodiments, the rotation-shaft rocker arm  20  includes two side walls  23  and a connection portion  24  connecting the two side walls  23 . 
     The one end  21  of the rotation-shaft rocker arm  20  is rotatably connected with the bracket  10  through the positioning and connection assembly  30 . Specifically, the positioning and connection assembly  30  includes a second limit member  31  for mating with the first limit member  11 . The first limit member  11  mates with the second limit member  31  to enable the rotation-shaft rocker arm  20  and the bracket  10  to be fixed relative to each other at a preset angle. The mating manner of the first limit member  11  and the second limit member  31  may include snapping, screwing, or the like. The second limit member  31  can rotate synchronously with the rotation-shaft rocker arm  20 . When the rotation-shaft rocker arm  20  rotates relative to the bracket  10 , the second limit member  31  also rotates relative to the bracket  10 . 
     In this embodiment, the preset angle can be any angle between 0 degrees and 180 degrees (including 0 degrees and 180 degrees). There may be a single preset angle. For example, the preset angle is 0 degrees, 30 degrees, 53 degrees, 107 degrees, or 120 degrees. By rotating the rotation-shaft rocker arm  20  or the bracket  10 , the positioning and connection assembly  30  can make the rotation-shaft rocker arm  20  and the bracket  10  be fixed relative to each other at 0 degrees, 30 degrees, 53 degrees, 107 degrees, or 120 degrees. Among them, when the preset angle is 0 degrees, the rotation-shaft rocker arm  20  fits the body  12  of the bracket  10 , when the preset angle is 53 degrees, the angle formed between the rotation-shaft rocker arm  20  and the bracket  10  is 53 degrees, and when the preset angle is 107 degrees, the angle formed between the rotation-shaft rocker arm  20  and the bracket  10  is 107 degrees. 
     There may be multiple preset angles. The multiple preset angles are non-uniformly distributed along a rotation plane (a plane perpendicular to the Z axis as shown in  FIG. 1 ) of the rotation-shaft rocker arm  20  and the bracket  10 , or the preset angles are uniformly distributed along the rotation plane. For example, there are three preset angles: 0 degrees, 53 degrees and 107 degrees. When the rotation-shaft rocker arm  20  rotates relative to the bracket  10 , the first limit member  11  mates with different limit portions of the second limit member  31 , or the second limit member  31  mates with different first limit members  11 , thereby achieving a switch between multiple preset angles. In an optional embodiment, the second limit member  31  has different limit portions. These limit portions are arranged radially with respect to a preset axis of the second limit member  31  and the positions of the limit portions are relatively fixed, so that when the first limit portion rotates, a rotation relative to it can be generated, therefore the first limit member  11  and the second limit member  31  can realize a switch between different angles during the rotation. For example, when the preset angle is switched from 53 degrees to 107 degrees, a certain external force is applied to the rotation-shaft rocker arm  20  or the bracket  10  to make the rotation-shaft rocker arm  20  rotate relative to the bracket  10  and drive the second limit member  31  to rotate relative to the first limit member  11  until the second limit member  31  and the first limit member  11  mate again, so that the angle between the rotation-shaft rocker arm  20  and the bracket  10  is changed from 53 degrees to 107 degrees. With the mate of the first limit member  11  and the second limit member  31 , the rotation-shaft rocker arm  20  and the bracket  10  can be fixed relative to each other at multiple different preset angles. Even if there is a shaking or a small external force, the angle between the rotation-shaft rocker arm  20  and the bracket  10  will not be easily changed, which ensures a stability of a fixed object on the bracket  10 . 
     In summary, the flip device  100  of the embodiments of the present disclosure is provided with the first limit member  11  and the positioning and connection assembly  30 . When the first limit member  11  mates with the second limit member  31  of the positioning and connection assembly  30 , the rotation-shaft rocker arm  20  and the bracket  10  are fixed relative to each other at a preset angle relative, therefore, it is not easy to shake. In addition, the rotation-shaft rocker arm  20  or the bracket  10  can be continuously rotated, so that the rotation-shaft rocker arm  20  and the bracket  10  are fixed relative to each other at multiple different preset angles. The switching operation among the preset angles is simple. 
     Referring to  FIG. 2 , in this embodiment, there may be a single first limit member  11 , or multiple first limit members  11 . When there is a single first limit member  11 , the single first limit member  11  is used to mate with the single second limit member  31 . The single first limit member  11  may be disposed at any end of the body  12  of the bracket  10 , for example, a left end or a right end of the body  12  shown in  FIG. 2 . When there are multiple first limit members  11 , the multiple first limit members  11  are connected to at least two ends of the body  12 , and the multiple first limit members  11  are all used to mate with the second limit member  31 . In the embodiment shown in  FIG. 2 , two first limit members  11  are sequentially connected to the left end and the right end of the body  12  and respectively mate with the second limit member  31  at the left end and the second limit member  31  at the right end. 
     Referring to  FIG. 2 , in this embodiment, the positioning and connection assembly  30  further includes a fastener  32 . The fastener  32  is used for fixedly connecting the rotation-shaft rocker arm  20  and the second limit member  31 . Under the restriction of the fastener  32 , the fastener  32  and the second limit member  31  form a revolute joint. When the rotation-shaft rocker arm  20  rotates relative to the bracket  10 , the fastener  32  drives the second limit member  31  to rotate along with the rotation-shaft rocker arm  20 , thereby causing the second limit member  31  to rotate relative to the first limit member  11 . Further, in this embodiment, the rotation-shaft rocker arm  20  can rotate around a preset axis (such as a Z axis in  FIG. 1 ) relative to the bracket  10 , and the fastener  32  is used to fix the rotation-shaft rocker arm  20 , the first limit member  11  and the second limit member  31  in an axial direction along the preset axis. In this embodiment, the preset axis at the left end may be collinear with the preset axis at the right end, and the positioning and connection assembly  30  and the bracket  10  at the left end, and the positioning and connection assembly  30  and the bracket  10  at the right end are disposed in mirror symmetry. When the flip device  100  is assembled, the fastener  32  at the left end passes through the second limit member  31 , the first limit member  11 , and the rotation-shaft rocker arm  20  in turn toward the left, and the fastener  32  at the right end passes through the second limit member  31 , the first limit member  11 , and the rotation-shaft rocker arm  20  in turn toward the right. The fastener  32  in this embodiment may be a rivet, a screw, a bolt, etc. 
     Referring to  FIG. 2 , in this embodiment, the positioning and connection assembly  30  further includes an elastic member  33 . The elastic member  33  is disposed between the fastener  32  and the second limit member  31 . The elastic member  33  is used for applying elastic force to the second limit member  31  along an axial direction of a preset axis, so that the second limit member  31  abuts against the first limit member  11 . Specifically, the fastener  32 , the elastic member  33  and the second limit member  31  form a revolute joint. The fastener  32  abuts against the elastic member  33 , the elastic member  33  abuts against the second limit member  31 , and the second limit member  31  abuts against the first limit member  11 . Therefore, the first limit member  11  and the second limit member  31  fit more closely, and the connection between the rotation-shaft rocker arm  20  and the bracket  10  is more reliable. In this embodiment, the elastic member  33  is made of elastic material, for example, a metal elastic piece, a spring member, an elastic rubber member, etc. The shape of the first limit member  11  and the second limit member  31  may be consistent with the shape of the elastic member  33 , for example, the elastic member  33  is round, and the first limit member  11  and the second limit member  31  may also be round. 
     Further, referring to  FIG. 3 , in this embodiment, the elastic member  33  is an elastic sheet  331 . The number of the elastic sheets  331  may be one or at least two, such as two, three, four, five, more than five, and so on. The number of elastic sheets  331  can be specifically set according to a thickness of the elastic sheet  331  on a preset axis, and an elastic force need of the second limit member  31  and the first limit member  11 . A larger number of elastic sheets can provide a larger amount of elastic force under a same rotation angle. When the number of the elastic sheets  331  is one, the single elastic sheet  331  may be disposed between the fastener  32  and the second limit member  31 , and in turn abut against the fastener  32  and the second limit member  31 . When the number of elastic sheets  331  is at least two, the at least two elastic sheets  331  are disposed between the fastener  32  and the second limit member  31 . In the embodiment of  FIG. 2 , the number of elastic sheets  331  is three, and the three elastic sheets  331  are sequentially stacked and disposed between the fastener  32  and the second limit member  31 . The elastic sheets  331  can also be disposed between the first limit member  11  and the rotation-shaft rocker arm  20 . 
     Referring to  FIGS. 2 and 3 , in this embodiment, the elastic member  33  is provided with a first hole  332 , the second limit member  31  is provided with a second hole  311 , the first limit member  11  is provided with a third hole  111 , and the rotation-shaft rocker arm  20  is provided with a fourth hole  25 . The fastener  32  includes a shaft portion  321 , and the shaft portion  321  passes through the first hole  332 , the second hole  311 , the third hole  111  and the fourth hole  25  in sequence. Under the restriction of the shaft portion  321 , the rotation-shaft rocker arm  20  can rotate about the shaft portion  321  relative to the bracket  10 , that is, the preset axis coincides with the shaft portion  321  (as shown in  FIG. 2 , the Z axis coincides with the shaft portion  321 ). In addition, the fastener  32  also includes an end portion  322 , and the end portion  322  is connected to the shaft portion  321 . When the elastic member  33 , the second limit member  31 , the first limit member  11 , and the rotation-shaft rocker arm  20  are disposed around the shaft portion  321 , the end portion  322  abuts against the elastic member  33  to prevent the elastic member  33 , the second limit member  31 , the first limit member  11 , and the rotation-shaft rocker arm  20  from escaping along the direction of the preset axis. Therefore, under the restriction of the shaft portion  321  and the end portion  322  of the fastener  32 , the fastener  32  can fix the rotation-shaft rocker arm  20  and the second limit member  31  in the direction of the preset axis and the direction of rotation around the preset axis. 
     Referring to  FIG. 3 , in this embodiment, the shape of the shaft portion  321  of the fastener  32  matches the shapes of the second hole  311  provided at the second limit member  31  and the fourth hole  25  provided at the rotation-shaft rocker arm  20 . For example, the shaft portion  321  is in contact with an outer contour of the second hole  311 , and the shaft portion  321  is in contact with an outer contour of the fourth hole  25 . When the shaft portion  321  passes through the first hole  332 , the second hole  311 , the third hole  111  and the fourth hole  25 , because the shape of the shaft portion  321  matches the shape of the second hole  311  and the fourth hole  25 , the fastener  32  and the second limit member  31  do not rotate relative to the shaft portion  321 , however the shaft portion  321  rotates with the rotation-shaft rocker arm  20  to drive the second limit member  31  to rotate, thereby causing the elastic sheet  331  and the second limit member  31  to rotate relative to the first limit member  11 . 
     Further, in this embodiment, a cross-section of the shaft portion  321  of the fastener  32 , the second hole  311  provided at the second limit member  31 , and the fourth hole  25  provided at the rotation-shaft rocker arm  20  have a same first shape. Among them, the first shape may be one of a racetrack shape, a rectangle, a triangle, an ellipse, a regular pentagon, a regular hexagon, or the like. For example, the cross-section of the shaft portion  321  is racetrack-shaped, and the second hole  311  provided at the second limit member  31  is also racetrack-shaped. Furthermore, the same first shape causes the fastener  32  to rotate when the rotation-shaft rocker arm  20  rotates, thereby driving the second limit member  31  to rotate. Specifically, when the fastener  32  rotates relative to the first limit member  11 , the shaft portion  321  can drive the second limit member  31  to rotate. For another example, the cross-section of the shaft portion  321  is racetrack-shaped, and the fourth hole  25  provided at the rotation-shaft rocker arm  20  is also racetrack-shaped, so that when the rotation-shaft rocker arm  20  rotates relative to the bracket  10 , the rotation-shaft rocker arm  20  can drive the shaft portion  321  to rotate. 
     In this embodiment, the first shape is inscribed in the first hole  332 , that is, the opening size of the first hole  332  provided at the elastic member  33  is larger than the cross-section size of the shaft portion  321 , so that when the fastener  32  rotates, the shaft portion  321  can rotate relative to the elastic member  33 . For example, the first shape is a racetrack shape, and the shape of the first hole  332  is a circle. When the rotation-shaft rocker arm  20  rotates relative to the bracket  10 , the shaft portion  321  rotates along the rotation-shaft rocker arm  20 , however the elastic member  33  may not follow the shaft portion  321  to rotate. In addition, the first shape is inscribed in the third hole  111 , that is, the opening size of the third hole  111  provided at the first limit member  11  is larger than the cross-section size of the shaft portion  321 , so that when the fastener  32  rotates, the shaft portion  321  can rotate relative to the first limit member  11 . For example, the first shape is a racetrack shape, and the shape of the third hole  111  is a circle. When the rotation-shaft rocker arm  20  rotates relative to the bracket  10 , the shaft portion  321  rotates along the rotation-shaft rocker arm  20 , however the first limit member  11  may not follow the shaft portion  321  to rotate. 
     Referring to  FIGS. 3 and 4 , in this embodiment, a first limit portion  112  is formed at the first limit member  11 , and a second limit portion  312  is formed at the second limit member  31  to fit with the first limit portion  112 . Specifically, the first limit member  11  includes a first limit surface  113 , and the first limit portion  112  is formed at the first limit surface  113 . The second limit member  31  includes a second limit surface  313 , and the second limit portion  312  is formed at the second limit surface  313 . When the first limit member  11  and the second limit member  31  fit together, the first limit surface  113  and the second limit surface  313  abut against each other, and the first limit portion  112  and the second limit portion  312  fit together. 
     Referring to  FIGS. 3 and 4 , in this embodiment, the first limit portion  112  may be a limit slot  1121  and the second limit portion  312  may be a protrusion  3121 . That is, the limit slot  1121  is formed at the first limit member  11 , and the protrusion  3121  is formed at the second limit member  31 . When the first limit member  11  and the second limit member  31  mate, the protrusion  3121  extends into the limit slot  1121 . Under the restriction of a side wall  23  of the limit slot  1121 , it is difficult for the protrusion  3121  to move out of the limit slot  1121  in a circumferential direction of the first limit member  11  under shaking or a small external force. In an example, the protrusion  3121  and the limit slot  1121  are in an interference fit, and the idle part of the rotation of the rotation-shaft rocker arm  20  and the bracket  10  is small. In this way, the first limit member  11  and the second limit member  31  fit closely. In another embodiment, the first limit portion  112  may also be a protrusion, and the second limit portion  312  may be a limit slot, that is, the protrusion is formed at the first limit member  11 , and the limit slot is formed at the second limit member  31 . 
     Referring to  FIGS. 3 and 4 , in this embodiment, there are multiple first limit portions  112 . There may be single or multiple second limit portions  312 . When there is a single second limit portion  312 , the single second limit portion  312  mates with one first limit portion  112  of the multiple first limit portions  112  to enable the rotation-shaft rocker arm  20  and the bracket  10  to be fixed relative to each other at different preset angles. When the rotation-shaft rocker arm  20  rotates about a preset axis relative to the bracket  10 , the single second limit portion  312  can sequentially mate with one first limit portion  112 , so as to realize a multi-gear (preset angles) switch. At this time, the number of preset angles is the same as the number of the first limit portions  112 . When there are multiple second limit portions  312 , the second limit portions  312  mate with different first limit portions  112  of the multiple first limit portions  112 , so that the rotation-shaft rocker arm  20  and the bracket  10  can be fixed relative to each other at different preset angles. For example, there are two second limit portions  312 . When the rotation-shaft rocker arm  20  rotates about a preset axis relative to the bracket  10 , the two second limit portions  312  can sequentially mate with the two first limit portions  112  to achieve a multi-gear (preset angles) switch. In addition, the mate of the multiple second limit portions  312  and the multiple first limit portions  112  can increase a mating force of the second limit member  31  and the first limit member  11 , so that the first limit member  11  and the second limit member  31  fit more closely and reliably. 
     Referring to  FIGS. 2 and 4 , in this embodiment, a plurality of sets of radially paired first limit portions  112  are distributed at the first limit member  11  in a circumferential direction of a preset axis. When there are multiple second limit portions  312 , the multiple first limit portions  112  are distributed at the first limit member  11  in the circumferential direction of the preset axis. In a radial direction of the preset axis, the two opposite first limit portions  112  constitute a set of first limit portions  112 . The plurality of sets of first limit portions  112  form at least two sets of different preset angles. The multiple second limit portions  312  mate with at least one set of first limit portions  112  so that the rotation-shaft rocker arm  20  and the bracket  10  can be fixed relative to each other at a preset angle. 
     By changing the distribution of the multiple first limit portions  112  at the first limit member  11 , the preset angle can be changed. For example, the number of the second limit portions  312  is two, the number of the first limit portions  112  is six (as shown in  FIG. 2 ), the number of the sets of the first limit portions  112  is three, and the number of the first limit portions  112  in each set is two. Each set of the first limit portions  112  is evenly distributed at the first limit member  11  in the axial direction of the preset axis, and the preset angle may be 0 degrees, 60 degrees, or 120 degrees. When the rotation-shaft rocker arm  20  rotates about a preset axis relative to the bracket  10 , the two second limit portions  312  can mate with a set of first limit portions  112  in sequence, so that the rotation-shaft rocker arm  20  and the bracket  10  can be fixed relative to each other in turn at 0 degrees, 60 degrees or 120 degrees, thereby achieving a multi-gear switch. In other embodiments, the number of the second limit portions  312  is two, the number of the first limit portions  112  is six, the number of the sets of the first limit portions  112  is three, and the number of the first limit portions  112  in each set is two. Each set of the first limit portions  112  is randomly distributed at the first limit member  11  in the axial direction of the preset axis, and the preset angle formed may be 0 degrees, 53 degrees, or 107 degrees. 
     Referring to  FIGS. 3 and 4 , in this embodiment, one set of the plurality of sets of radially paired first limit portions  112  is at a small angle α to a plane of the bracket  10 . When the second limit portion  312  and the first limit portion  112  mate, there is a prestress between the bracket  10  and the rotation-shaft rocker arm  20 . 
     Specifically, a connection line between one set of the first limit portions  112  of the plurality of sets of radially paired first limit portions  112  forms a small angle α with a plane where the body  12  is located. When the second limit portion  312  mates with the first limit portion  112  to enable the rotation-shaft rocker arm  20  and the bracket  10  to be fixed relative to each other at 0 degrees, the first limit member  11  applies to the second limit member  31  a force toward a first side  121 . Therefore, the body  12  applies to the rotation-shaft rocker arm  20  a prestress toward the first side  121 , so that the rotation-shaft rocker arm  20  and the body  12  are in a mutually clamped state. In this embodiment, a range of the small angle α is (0, 3] degrees, such as 0.5 degrees, 1.5 degrees, 2 degrees, 2.5 degrees, 3 degrees, etc. The larger the small angle α, the greater the prestress between the rotation-shaft rocker arm  20  and the body  12 . 
     Referring to  FIG. 2 , in this embodiment, an accommodation slot  13  recessed inward from a side of the body  12  is formed at the body  12 . The first limit member  11  extends along the side of the body  12  and partially covers a gap of the accommodation slot  13 . The first limit member  11  and a plane where the body  12  of the bracket  10  is located form an included angle that is not zero degrees. When the rotation-shaft rocker arm  20  is connected to the bracket  10  through the positioning and connection assembly  30 , the positioning and connection assembly  30  is at least partially accommodated inside the accommodation slot  13 . When the flip device  100  is assembled, the rotation-shaft rocker arm  20  is arranged close to one side of the first limit member  11 , the second limit member  31  is arranged close to the other side of the first limit member  11 , the elastic member  33  is arranged close to the second limit member  31 , the fastener  32  is arranged close to the elastic member  33 , and the shaft portion  321  sequentially passes through the first hole  332  at the elastic member  33 , the second hole  311  at the second limit member  31 , the third hole  111  at the first limit member  11 , and the fourth hole  25  at the rotation-shaft rocker arm  20 . The first limit member  11  can also extend from the body  12  along a direction of the first side  121  pointing to a second side  122 . In this way, the body  12  does not need to form the accommodation slot  13  for accommodating the positioning and connection assembly  30 . 
     In this embodiment, the second limit member  31  may also be disposed at the rotation-shaft rocker arm  20 . When the flip device  100  is assembled, the fastener  32  passes through the first hole  332  at the elastic member  33 , the fourth hole  25  (that is, the second hole  311  at the second limit member  31 ) at the rotation-shaft rocker arm  20 , and the third hole  111  at the first limit member  11  to realize a connection between the rotation-shaft rocker arm  20  and the bracket  10 . 
     Referring to  FIG. 5 , a camera  1000  according to an embodiment of the disclosure includes a camera body  200 , a screen  300  and a flip device  100 . The other end  22  of the rotation-shaft rocker arm  20  is connected to the camera body  200 , and the screen  300  is fixed at the bracket  10 . 
     The camera  1000  of the embodiments of the disclosure may be a film camera, a digital camera, a single-lens reflex camera, or the like. The camera body  200  is provided with a viewfinder such as a lens for shooting a target object. Referring to  FIG. 2 , one end  21  of the rotation-shaft rocker arm  20  is connected to the bracket  10 , and the other end  22  is connected to the camera body  200 . The screen  300  is fixed at the bracket  10  of the flip device  100 . The screen  300  may be a display screen, a touch screen, or the like, and the screen  300  can display the content of a view taken by the camera  1000 . 
     Under a scenario where a relative position of the other end  22  of the rotation-shaft rocker arm  20  and the camera body  200  remains unchanged, the mate of the first limit member  11  and the second limit member  31  can realize that the bracket  10  and the rotation-shaft rocker arm  20  are fixed relative to each other at a preset angle, so that the screen  300  and the bracket  10  can also be fixed relative to each other at the preset angle. Specifically, for example, there are three preset angles of 0 degrees, 53 degrees and 107 degrees. When the bracket  10  and the rotation-shaft rocker arm  20  are fixed relative to each other at 0 degrees, the screen  300  and the rotation-shaft rocker arm  20  are fixed relative to each other at 0 degrees and form an included angle with the camera body  200 . When the bracket  10  and the rotation-shaft rocker arm  20  are fixed relative to each other at 53 degrees, the screen  300  and the rotation-shaft rocker arm  20  are fixed relative to each other at 53 degrees and form another included angle with the camera body  200 . When the bracket  10  and the rotation-shaft rocker arm  20  are fixed relative to each other at 107 degrees, the screen  300  and the rotation-shaft rocker arm  20  are fixed relative to each other at 107 degrees and form another included angle with the camera body  200 . Therefore, a user can adjust the angle between the screen  300  and the camera body  200  by adjusting the angle between the bracket  10  and the rotation-shaft rocker arm  20 , and the user can look directly at the screen  300  of the camera  1000 , thereby facilitating the user shooting from different shooting angles. 
     In summary, in the camera  1000  of the embodiments of the present disclosure, the flip device  100  is provided with the first limit member  11  and the positioning and connection assembly  30 . When the first limit member  11  mates with the second limit member  31  of the positioning and connection assembly  30 , the rotation-shaft rocker arm  20  and the bracket  10  are fixed relative to each other at a preset angle, therefore, it is not easy to shake, which facilitates the user looking directly at the screen  300  of the camera  1000  at the preset angle and provides a good visual effect. In addition, the user can continue to rotate the rotation-shaft rocker arm  20  or the bracket  10  so that the rotation-shaft rocker arm  20  and the bracket  10  are fixed at multiple different preset angles. The switching operation between the multiple preset angles is simple, and the user experience is good. 
     Referring to  FIG. 5 , in this embodiment, a receiving slot  201  is formed at the camera body  200 . The other end  22  of the rotation-shaft rocker arm  20  is connected in the receiving slot  201 . The rotation-shaft rocker arm  20  can rotate relative to the camera body  200  so that a side wall  23  of the rotation-shaft rocker arm  20  extends into or out of the receiving slot  201 . Specifically, in the embodiment of  FIG. 2 , the rotation-shaft rocker arm  20  includes two side walls  23  and a connection portion  24 , and the connection portion  24  connects the two side walls  23 . The shape and number of the receiving slot  201  correspond to the shape and number of the side wall  23 . In other examples, the shape of the receiving slot  201  corresponds to the overall shape of the rotation-shaft rocker arm  20 , that is, the receiving slot  201  can not only accommodate the two side walls  23  of the rotation-shaft rocker arm  20 , but also the connection portion  24 . The other end  22  of the rotation-shaft rocker arm  20  is rotatably connected with the camera body  200 , such as hinged. The side wall  23  includes two opposite ends. One end  21  is rotatably connected to the bracket  10  through the positioning and connection assembly  30 , and the other end  22  is rotatably connected to the camera body  200 . 
     The other end  22  of the side wall  23  can rotate relative to the camera body  200  to any angle from 0 degrees to 180 degrees (including 0 degrees and 180 degrees). Referring to  FIG. 6 , specifically, when the other end  22  of the side wall  23  rotates to 0 degrees or 180 degrees relative to the camera body  200 , and the rotation-shaft rocker arm  20  and the bracket  10  are fixed relative to each other at 0 degrees through the positioning and connection assembly  30  (that is, the rotation-shaft rocker arm  20  and the bracket  10  are in a clamped state), the two side walls  23  both extend into the receiving slot  201 , and the connection portion  24  fit the camera body  200  so that the screen  300  is folded to fit the camera body  200  and the appearance of the camera body  200  is beautiful. 
     The user can adjust the preset angle between the rotation-shaft rocker arm  20  and the bracket  10 , and the angle between the rotation-shaft rocker arm  20  and the camera body  200 , so as to perform multi-angle shooting. In addition, the user can look directly at the screen  300  at the preset angle and the visual effect is good. For example, referring to  FIG. 6 , the user can look directly at the screen  300  when the screen  300  is folded to fit the camera body  200 , so as to shoot a target object directly in front of the user (the direction in which the user looks directly at). Referring to  FIG. 7 , the user can adjust the angle between the screen  300  and the camera body  200 , so that the user can look directly at the screen  300  when looking up and shoot a target object above the user (above the user&#39;s eyes, and in a direction that the user needs to look up), such as shooting fruits on a tree. Referring to  FIG. 8 , the user can adjust the angle between the screen  300  and the camera body  200 , so that the user can look directly at the screen  300  when looking down and shoot a target object below the user (below the user&#39;s eyes, and in a direction that the user needs to look down), such as shooting flowers on the ground. 
     Referring to  FIGS. 1 and 2 , a flip device  100  according to an embodiment of the present disclosure includes a bracket  10 , a rotation-shaft rocker arm  20 , and a positioning and connection assembly  30 . The rotation-shaft rocker arm  20  is rotatably connected with the bracket  10  through the positioning and connection assembly  30 , and can switch between a rotation state and a fixation state with a change of the rotation angle. 
     The flip device  100  according to the embodiments of the present disclosure includes the positioning and connection assembly  30 . The rotation-shaft rocker arm  20  and the bracket  10  can be fixed relative to each other at a preset angle through the positioning and connection assembly  30 , therefore, it is not easy to shake. In addition, the rotation-shaft rocker arm  20  or the bracket  10  can be continuously rotated, so that the rotation-shaft rocker arm  20  and the bracket  10  are fixed relative to each other at multiple different preset angles. The switching operation between the multiple preset angles is simple. 
     In one possible embodiment, a flip device is provided and includes a bracket, a rotation-shaft rocker arm, and a positioning and connection assembly for connecting the bracket and the rotation-shaft rocker arm. The bracket includes a bracket body, and a first limit member is disposed at one side or both sides of the bracket body. The rotation-shaft rocker arm include a rocker arm portion and a body, and one end of the rocker arm portion is connected with the first limit member at a side of the bracket through the positioning and connection assembly. In addition, the rocker arm portion can rotate relative to a connection shaft formed at the connection, and rotate relative to the bracket. The positioning and connection assembly includes a second limit member. Because the first limit member is fixed relative to the bracket body and the second limit member rotates relative to the bracket body, the mate of the first limit member and the second limit member can enable the rotation-shaft rocker arm and the bracket to be fixed relative to each other at different preset angles. In this way, the bracket and the rotation-shaft rocker arm of the flip device can be relatively opened at different angles. 
     In one possible embodiment, the mate of the first limit member and the second limit member is realized by a limit portion disposed at the first limit member and the second limit member. Specifically, the limit portion can be realized by a concave-convex fit. For example, a slot is provided at the first limit member, and a protrusion is disposed at the second limit member. During a rotation, when the positions of the slot and the protrusion overlap, a mate is realized and the two parts are fixed relative to each other at an angle. When an external force is applied to a certain extent, the slot and the protrusion is separated and a new rotation occurs. Since the position of the slot is fixed, the protrusion will mate with a new slot that can be mated with. In order to ensure stability, the protrusions and slots are designed symmetrically with respect to the axis of rotation. In this way, during the rotation process, the protrusions at the symmetrical position mate with the slots at the symmetrical position at the same time, thereby greatly improving the stability degree of the fit of the limit members. The mating manner where the fixed first limit member is provided with multiple slots and the relatively rotating second limit member is provided with protrusions has an advantage that the angle between the slots can be set freely in a circumferential direction, so that the angle during the rotation process can be set according to the preset slot positions, such as 53 degrees, 107 degrees, etc. Therefore, by setting the slot positions, the bracket and the rotation-shaft rocker arm can be set at different angles relative to each other. In another manner, the limit portion at the fixed first limit member is provided as a protrusion, and the limit portion at the second limit member is a slot. At this time, during the rotation process, because the protrusion provides a support effect on a plane where the slot is located, the numbers of slots and protrusions need to be the same, and the slots and protrusions need to be disposed at equal angle intervals. For example, the slots and protrusions are provided at a circumferential interval of 60 degrees, or a circumferential interval of 30 degrees. In this way, the bracket and the rotation-shaft rocker arm of the flip device adjust the angle at equal intervals. Without loss of generality, the first limit member and the second limit member can also be friction surfaces with greater damping. 
     In one possible embodiment, a pressure needs to be applied between the first limit member and the second limit member to ensure that there is a prestress between the first limit member and the second limit member, thereby ensuring stability of the relative fixation of the first limit member and the second limit member. Therefore, an elastic member may be added to the positioning and connection assembly, and the elastic member may be disposed between a fastener and the second limit member. Thereby, an elastic force is applied to the second limit member along an axial direction of a preset axis, so that the second limit member abuts against the first limit member. The elastic member can be an elastic rubber, a spring, or an elastic sheet. The elastic sheet can be single or multiple stacked. When the stacked elastic sheets are used, because the force on the elastic sheets is a resultant force generated by each elastic sheet, the elastic force generated by the stacked elastic sheets can be fine-tuned by increasing or decreasing the number of the elastic sheets, so as to ensure that the elastic force generated by the elastic member is not too large or too small. Too large elastic force is likely to cause elastic fatigue and shorten the life of the elastic member. Too small elastic force is disadvantageous to the compression of the limit member during rotation. 
     In one possible embodiment, a fastener includes a shaft portion and an end, and the shaft portion sequentially passes through a hole at the elastic member, a hole at the second limit member, a hole at the first limit member, and a hole at the rotation-shaft rocker arm. The end abuts against the elastic member. 
     In one possible embodiment, the fastener is in an interference fit with the second limit member and the rotation-shaft rocker arm, and is inscribed in the holes at the elastic member and a first limit member, so that the rotation-shaft rocker arm can drive the second limit member to rotate through the fastener, and further generate relative rotation with the elastic sheet and the first limit member. One manner to achieve the interference fit is to make the cross-section of the shaft portion of the fastener, the hole at the second limit member, and the hole at the rotation-shaft rocker arm have the same opening shape, and the shape of the opening hinders the relative rotation. For example, the shape of the opening may be one of a racetrack shape, an oval shape, a square, a rectangle, or the like. 
     In one possible embodiment, since the bracket and the rotation-shaft rocker arm rotate relatively, a relative rotation limit of the bracket and the rotation-shaft rocker arm is at a position where the two coincide. Because of the stress at the rotation shaft, it is difficult for the bracket and the rotation-shaft rocker arm to keep a close coincidence on a plane, which is true even if a limit portion is set at the position of the coincident plane to ensure that the two coincide. In order to make the bracket and the rotation-shaft rocker arm able to fit closely, the limit portion is set at an “over-coincidence” position. One manner to achieve the over-coincidence is to make an angle between the limit portion and the coincident plane be a small negative angle, instead of being 0 degrees. For example, the angle can be selected between −1 degrees and −3 degrees. In this way, a pressure can be applied between the rotation-shaft rocker arm and the bracket through the limit member, so as to ensure that the two can fit closely. 
     In one possible embodiment, the bracket further includes a body, and the first limit member is connected to the body. There is one single first limit member, and the single first limit member mates with the second limit member. Or, there are multiple first limit members, the multiple first limit members are connected to at least two ends of the body, and the multiple first limit members all mate with the second limit member. 
     In one possible embodiment, the bracket includes a body, and an accommodation slot recessed inward from a side of the body is provided at the body. The positioning and connection assembly is at least partially accommodated in the accommodation slot. 
     In one possible embodiment, the flip device includes a bracket, where the bracket includes a connection member and a limit slot is formed at a side wall of the connection member, and a rotation-shaft rocker arm. The rotation-shaft rocker arm includes a rocker arm and a limit protrusion. One end of the rocker arm is rotatably connected with the connection member, and the rocker arm can rotate relative to the connection member around a preset axis and drive the limit protrusion to rotate relative to the limit slot. When the rocker arm rotates to a preset angle relative to the connection member, the limit protrusion mates with the limit slot to keep the angel between the rocker arm and the bracket at the preset angle. 
     In one possible embodiment, the rotation-shaft rocker arm further includes a fastener and a rotation member. The limit protrusion is formed at the rotation member, and the fastener is used for fixing the rocker arm, the rotation member and the connection member in an axial direction of the preset axis. The rotation of the rocker arm can drive the fastener and the rotation member to rotate. 
     In one possible embodiment, the rotation-shaft rocker arm further includes an elastic member and the elastic member is disposed between the fastener and the rotation member. The elastic member is used for applying an elastic force to the rotation member in the axial direction of the preset axis, so that the limit protrusion abuts against the connection member. 
     In one possible embodiment, there are multiple elastic members, and the multiple elastic members are stacked and disposed between the fastener and the rotation member. 
     In one possible embodiment, a first hole is provided at the elastic member, a second hole is provided at the rotation member, a third hole is provided at the connection member, and a fourth hole is provided at the rocker arm. The fastener passes through the first hole, the second hole, the third hole, and the fourth hole in sequence and fixes the elastic member, the rotation member, the connection member, and the rocker arm in the axial direction of the preset axis. 
     In one possible embodiment, the fastener includes an end portion and a shaft portion that are fixedly connected. The end portion abuts against the elastic member, and the shaft portion passes through the first hole, the second hole, the third hole and the fourth hole. The shape of the shaft portion matches the shape of the second hole and the fourth hole, so that the fastener, the rotation member, and the rocker arm rotate synchronously. 
     In one possible embodiment, the opening size of the first hole is larger than the size of the cross-section of the shaft portion, so that the shaft portion can rotate relative to the elastic member. 
     In one possible embodiment, the opening size of the third hole is larger than the size of the cross-section of the shaft portion, so that the shaft portion can rotate relative to the connection member. 
     In one possible embodiment, there are multiple limit slots, and the multiple limit slot are distributed at the connection member at intervals around the preset axis. The limit protrusion can mate with different limit slots to keep the rocker arm and the bracket at different preset angles. 
     In one possible embodiment, there are multiple limit protrusions. At least two limit protrusions and an orthographic projection point of the preset axis on the rotation member are located at a same line. The included angles between lines connecting at least two limit slots and the orthographic projection point of the preset axis on the connection member are acute angles, and the included angle range is (0, 3] degrees. 
     In one possible embodiment, the bracket further includes a body, and the connection member is connected to the body. There is one single connection member, and the limit slot at the single connection member mates with the limit protrusion. Or, the bracket further includes a body, and there are multipole connection members. The multiple connection members are connected to at least two ends of the body. Each of the connection members is provided with the limit slot and the limit slots at the multiple connection members mate with the limit protrusions. 
     In one possible embodiment, the bracket further includes a body, and the connection member is connected to a side of the body. A receiving slot recessed inward from the side is formed at the body, and the rotation-shaft rocker arm is at least partially received in the receiving slot. 
     In one possible embodiment, the limit protrusion is disposed at a side wall of the rocker arm. 
     In one possible embodiment, a camera is provided and includes a camera body, a screen, and a flip device. The other end of the rocker arm is connected to the camera body, and the screen is fixed at the bracket. A receiving slot is formed at the camera body, and the other end of the rocker arm is connected in the receiving slot. The rocker arm can rotate relative to the camera body so that the side wall of the rocker arm can extend in or out of the receiving slot. 
     In one possible embodiment, the preset angles are non-uniformly distributed along a rotation plane of the rotation-shaft rocker arm and the bracket (as shown in  FIG. 1 , a plane perpendicular to the Z axis), or the preset angles are uniformly distributed along the rotation plane. 
     In one possible embodiment, the rotation-shaft rocker arm has a U-shaped or H-shaped structure. The two arms of the U-shaped or H-shaped form the two arms of the rotation-shaft rocker arm. The U-shaped or H-shaped two arms are rotatably connected with the bracket body. 
     In the description of the embodiments of the present disclosure, it should be understood that the terms “first” and “second” are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Therefore, the features defined with “first” and “second” may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, “multiple” means two or more, unless otherwise clearly and specifically defined. Those skilled in the art can know that, because the components in the flip device in the disclosure generate a relative rotational movement, therefore there are two directions. One direction is along the axial direction and the other direction is perpendicular to the axial direction. 
     In the description of the embodiments of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms “mounting,” “connecting,” and “connected” should be understood in a broad way. For example, it can be a fixed connection or a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection, or it can communicate with each other. It can be directly connected, or indirectly connected through an intermediate medium. It can be an internal communication of two components or an interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above-described terms in the embodiments of this disclosure can be understood according to specific scenarios. 
     In the description of this disclosure, the description with reference to the terms “one embodiment,” “some embodiments,” “exemplary embodiments,” “examples,” “specific examples” or “some examples,” etc. means that the specific features, structures, materials, or characteristics described in the embodiments or examples are included in at least one embodiment or example in this disclosure. In this disclosure, the schematic representations of the above-described terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in an appropriate manner. 
     Although the embodiments of this disclosure have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limitations to this disclosure. Those of ordinary skill in the art can make changes, modifications, replacements and modifications on the above embodiments within the scope of this disclosure.