Patent Publication Number: US-2023138376-A1

Title: Portable electronic device

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the priority benefit of Taiwan Application Serial No.  110140925 , filed on Nov. 3, 2021. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of the specification. 
     BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The disclosure relates to a portable electronic device. 
     Description of the Related Art 
     In recent years, as mobile communication technologies are highly developed, many novel applications have been created. In addition, various novel portable electronic devices are continuously brought forth. Through continuous improvement, central processing units (CPUs) of existing portable electronic devices have considerable computing power, and support a plurality of software operations while providing excellent use convenience. However, generally, for the convenience of users to carry and use portable electronic devices, the design of integrating a fan in a portable electronic device, such as a smart phone, a tablet computer, or a wearable device, is relatively rare because the fan has a large volume and generates some noise during operation. Therefore, to enable CPUs of portable devices to maintain operating at relatively high power and efficiency, it is necessary to provide additional heat dissipation capabilities for the portable devices. 
     BRIEF SUMMARY OF THE INVENTION 
     According to an aspect of the disclosure, a portable electronic device includes a housing, a heat dissipation element, a bracket, a drive connecting rod, and a door cover structure. The housing includes a heat dissipation opening. The heat dissipation element is disposed in the housing and corresponds to the heat dissipation opening. The bracket is disposed in the housing and frames the heat dissipation element. The drive connecting rod is pivotally connected to the bracket and is adapted to be driven to rotate. The door cover structure is coupled to the bracket, and the drive connecting rod is pivotally connected to the door cover structure to drive the door cover structure to move to cover or expose the heat dissipation opening. 
     Based on the above, a housing of a portable electronic device disclosed in the disclosure includes a heat dissipation opening, used to expose at least a part of the heat dissipation element in the housing. The portable electronic device further includes a door cover structure, and drives the door cover structure to move through a drive connecting rod pivotally connected between the bracket and the door cover structure to cover or expose the heat dissipation opening. Elements, such as the door cover structure and the drive connecting rod, are assembled in the portable electronic device in a modular manner through the bracket. With this configuration, when the portable electronic device has a high heat dissipation requirement, the door cover structure is opened manually or automatically to facilitate heat dissipation. Therefore, the portable electronic device has higher heat dissipation efficiency. In addition, the modular design also simplifies cumbersome assembly steps. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a schematic diagram of a portable electronic device according to an embodiment of the disclosure; 
         FIG.  2    is a schematic cross-sectional diagram of a portable electronic device cooperating with a fan module according to an embodiment of the disclosure; 
         FIG.  3    is a schematic diagram of a door cover structure of a portable electronic device in a closed position according to an embodiment of the disclosure; 
         FIG.  4    is a schematic diagram of a door cover structure of the portable electronic device in  FIG.  3    in an open position; 
         FIG.  5    is another schematic diagram of a door cover structure of the portable electronic device in  FIG.  3    in a closed position; 
         FIG.  6    is a schematic diagram of a door cover structure of a portable electronic device in a closed position according to another embodiment of the disclosure; 
         FIG.  7    is a schematic diagram of a door cover structure of the portable electronic device in  FIG.  6    in an open position; 
         FIG.  8    is another schematic diagram of a door cover structure of the portable electronic device in  FIG.  6    in a closed position; 
         FIG.  9    is a partial cross-sectional schematic diagram of the door cover structure of the portable electronic device in  FIG.  6    in a closed position; 
         FIG.  10    is a schematic diagram of a door cover structure of a portable electronic device in a closed position according to still another embodiment of the disclosure; 
         FIG.  11    is a schematic diagram of a door cover structure of the portable electronic device in  FIG.  10    in an open position; 
         FIG.  12    is another schematic diagram of the door cover structure of the portable electronic device in  FIG.  11    in an open position; 
         FIG.  13    is a schematic diagram of a door cover structure of a portable electronic device in a closed position according to an embodiment of the disclosure; 
         FIG.  14    is a schematic exploded view of some elements of the portable electronic device in  FIG.  13   ; 
         FIG.  15    is a schematic diagram of an adapter of the portable electronic device in  FIG.  13   ; 
         FIG.  16    is a schematic partial cross-sectional diagram of the portable electronic device in  FIG.  13   ; 
         FIG.  17    is a schematic diagram of the door cover structure of the portable electronic device in  FIG.  13   ; 
         FIG.  18    is a schematic partial enlarged diagram of the portable electronic device in  FIG.  13   ; and 
         FIG.  19    is another schematic partial enlarged diagram of the portable electronic device in  FIG.  13   . 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     Referring to  FIG.  1    to  FIG.  3   , in an embodiment, a portable electronic device  100  includes a housing  110 , a heating element (not shown), a heat dissipation element  130 , a bracket  140 , a drive connecting rod  160 , and a door cover structure  150 . The housing  110  is used to define an accommodating space, and includes a heat dissipation opening  112  on a surface thereof. It should be noted that although a smart phone is always used below as an example to describe the content of the disclosure. A person of ordinary skill in the art should understand that the smart phone is replaceable with another portable electronic device. In this embodiment, the heat dissipation opening  112  is, in an embodiment, located on the back of the portable electronic device  100 . The heating element is disposed in the accommodating space defined by the housing  110 . In some embodiments, the heating element is, in an embodiment, a CPU or another type of heating element of the portable electronic device  100 , and is configured on a circuit board in the housing  110 . The heat dissipation element  130  includes a cooling fin assembly, thermally coupled to the heating element. In another embodiment, the heat dissipation element  130  is alternatively configured around a heat generating element. The heat dissipation element  130  and the heat generating element are connected by elements such as a vapor chamber to facilitate heat dissipation. In some embodiments, a contact surface between the heat dissipation element  130  and the heating element or the vapor chamber is coated with a heat conductive paste to enhance the heat transfer efficiency, but the disclosure is not limited thereto. 
     In an embodiment, the heat dissipation element  130  is disposed in the housing  110  and corresponds to the heat dissipation opening  112 . In other words, the heat dissipation opening  112  of the housing  110  exposes at least a part of the heat dissipation element  130  (in an embodiment, cooling fins), so as to improve the heat dissipation efficiency of the heat dissipation element  130 . In this embodiment, the heat dissipation element  130  is a passive heat dissipation element, but the disclosure is not limited thereto. In an embodiment, a material of the heat dissipation element (fin)  130  is the same as a material of the housing  110 . Moreover, the heat dissipation element  130  is a portion extending from the housing  110 . Certainly, in another embodiment, the heat dissipation element  130  is alternatively a separate heat dissipation (fin) part, and is fixed in the portable electronic device  100 , in an embodiment, in a manner such as welding. 
     Referring to both  FIG.  3    and  FIG.  4   , in some embodiments, the bracket  140  is disposed in the housing  110  and frames the heat dissipation element  130 . In an embodiment, the bracket  140  is locked on, in an embodiment, a bottom plate of the housing  110  through a locking member  146 , but the disclosure is not limited thereto. In this embodiment, the bracket  140  includes a framing portion  142  and a fixing portion  144 . The framing portion  142  is configured to frame the heat dissipation element  130  and define a bracket opening  148 . The bracket opening  148  corresponds to the heat dissipation opening  112  of the housing  110  to jointly expose the heat dissipation element  130 . The fixing portion  144  is disposed around the framing portion  142  and includes a locking hole for the locking member  146  to lock. 
     In an embodiment, the door cover structure  150  is coupled to the bracket  140  and corresponds to the heat dissipation opening  112 . In this embodiment, the door cover structure  150  is configured to be driven to move relative to the bracket  140  (in an embodiment, linearly moves, rotates, and/or rolls) to cover and/or expose the heat dissipation opening  112 . In this embodiment, the drive connecting rod  160  is pivotally connected between the bracket  140  and the door cover structure  150 , and is driven to rotate, to drive the door cover structure  150  to move between a closed position (the closed position shown in  FIG.  3   ) for covering the heat dissipation opening  112  and an open position (the open position shown in  FIG.  4   ) for exposing the heat dissipation opening  112  and the heat dissipation element  130  below. 
     In an embodiment, the portable electronic device  100  further includes a push rod  172  and a drive roller  174  connected to the drive connecting rod  160 . In an embodiment, the drive connecting rod  160  further includes an axle end  162  and a pivot end  164  opposite to each other, where the drive roller  174  is connected to the axle end  162 , to drive the axle end  162  to rotate, and the pivot end  164  is pivotally connected to the door cover structure  150 , to drive the door cover structure  150  to move (rise or fall and rotate). Further, the drive connecting rod  160  further includes a driver  166  engaged with the axle end  162 , and a protruding portion  1661  of the driver  166  passes through an axis of the drive roller  174 . In some embodiments, the driver  166  and the axle end  162  are engaged with each other through a form-fitting engagement structure (in an embodiment, the axle end  162  includes a cross engaging groove, and the driver  166  include a cross engaging rib, which are not limited thereto). Directions of an engaging groove and an engaging rib are different from a rotation direction R 1  to prevent engagement between the driver  166  and the axle end  162  from being loosened due to reciprocating rotation. The push rod  172  further includes a stressed portion  1721  and a slope portion  1722 . In such configuration, to cause the door cover structure  150  to expose the heat dissipation opening  112  for heat dissipation, an external force F is applied to the stressed portion  1721  of the push rod  172 , to move the push rod  172  in a moving direction D 1  toward the drive roller  174 , so as to further force the drive roller  174  to lift upward along the slope portion  1722  to a position shown in  FIG.  4   . Therefore, a protruding portion  1661  is pulled up to drive the axle end  162  of the drive connecting rod  160  to rotate in a rotation direction R 1 , so as to further lift the door cover structure  150  upward. 
     Further, the bracket  140  further includes a slide rail  147 . The door cover structure  150  includes a slider  152  and a pivot portion  154 . The slider  152  is slidably disposed in the slide rail  147  to move (in an embodiment, linearly move, rotate, and/or roll) along the slide rail  147 . The pivot portion  154  is pivotally connected to the drive connecting rod  160 . In this embodiment, the door cover structure  150  includes a first end E 1  and a second end E 2  opposite to each other. The slider  152  is disposed at the first end E 1 . The pivot portion  154  is located between the first end E 1  and the second end E 2 , to serve as a pivot point. In this way, when the drive connecting rod  160  drives the pivot portion  154  of the door cover structure  150  to lift (rotate) upward (away from the bracket), the slider  152  at the first end E 1  moves along the slide rail  147  in a moving direction D 1 , to further cause the pivot portion  154  of the door cover structure  150  to rotate relative to the drive connecting rod  160  to open the door cover structure  150 . In some embodiments, the drive connecting rod  160 , the slide rail  147 , and the push rod  172  are symmetrically disposed on two opposite sides of the bracket  140  to improve the smoothness of a stroke of the door cover structure  150  between a closed position shown in  FIG.  3    and an open position shown in  FIG.  4   . 
     In this embodiment, the portable electronic device  100  includes a temperature sensor, disposed on the heating element to sense a temperature of the heating element. When the temperature sensor detects that a temperature of the heating element is higher than a warning temperature, a prompt pops up on a display of the portable electronic device  100 , in an embodiment, so that a user manually opens the door cover structure  150  (in an embodiment, apply an external force F to push the push rod  172 ) to expose the heat dissipation element  130  and help the heat dissipation element  130  dissipate heat. In some embodiments, when the temperature sensor detects that a temperature of the heating element is higher than a warning temperature, the portable electronic device  100  alternatively opens or closes the door cover structure by cooperating with another device (in an embodiment, a heat dissipation kit such as a fan module). In another embodiment, the portable electronic device  100  alternatively automatically controls the door cover structure  150  to change from a closed position to an open position, to facilitate heat dissipation. The disclosure is not limited thereto. 
     Referring to  FIG.  2   , in some embodiments, the portable electronic device  100  cooperates with another heat dissipation kit, to further help the heating element and the heat dissipation element  130  dissipate heat. In this embodiment, the portable electronic device  100  includes a fan module  200  sleeved on the housing  110 . In this way, when there is a relatively high need for heat dissipation, the fan module  200  is sleeved on the housing  110 , to be combined with the portable electronic device  100  and help the portable electronic device  100  dissipate heat. The fan module  200  includes a base  210  and a fan assembly  220 . The base  210  is in a shape fit with at least a part of the housing  110 , to be sleeved on the housing  110  of the portable electronic device  100 . In addition, the base  210  includes an air outlet  216  corresponding to the heat dissipation opening  112  of the housing  110 . In some embodiments, the fan module  200  includes a drive rod (not shown), which is, in an embodiment, a protruding rod disposed on an inner surface of the base  210  to form a shape fit with at least a part of the housing  110  on the base  210 . While being sleeved on the housing  110  of the portable electronic device  100 , the drive rod of the fan module  200  pushes against the push rod  172 , to push the push rod  172  inward in the moving direction D 1 , thereby driving the door cover structure  150  to rotate and lift upward to an open position. 
     In an embodiment, the fan assembly  220  includes at least one fan. When the fan module  200  is sleeved on the portable electronic device  100 , the door cover structure  150  is in an open position. In this case, an air outlet  222  of the fan assembly  220  faces the heat dissipation element  130 , and the door cover structure  150  extends between the air outlet  222  and the heat dissipation element  130 . Therefore, the door cover structure  150  in the open position also has a flow guiding function. In addition, an air inlet  224  of the fan assembly  220  is located on a surface of the fan away from the back of the portable electronic device  100 . In such configuration, when the fan module  200  is sleeved on the housing  110 , the door cover structure  150  is opened simultaneously for heat dissipation, and the fan assembly  220  provides a cooling air flow, which is guided by the door cover structure  150  to flow to the heat dissipation element  130 , to help the heat dissipation element  130  dissipate heat. 
     In an embodiment, the heat dissipation element  130  includes an arc-shaped flow guide groove  132 . The bracket  140  further includes an arc-shaped flow guide surface  141  facing the heat dissipation element  130 , to define an arc-shaped flow path together with the arc-shaped flow guide groove  132 , so that cold air flows into and out of the housing  110  along the arc-shaped flow path without staying in a dead-angle (right-angle) region in the housing  110 , thereby further improving the heat dissipation efficiency. 
     In some embodiments, the drive connecting rod  160  further includes at least one elastic restoring member  168  (which is shown as one, but is not limited thereto), connected between the drive connecting rod  160  and the bracket  140 , so that after an external force of pushing the push rod  172  disappears, the drive connecting rod  160  is pulled back to the closed position shown in  FIG.  3    by an elastic restoring force of the elastic restoring member. In some embodiments, the elastic restoring member  168  is a tension spring, but is not limited thereto. In some embodiments, the portable electronic device  100  further includes at least one first magnetic element  149  and a second magnetic element  169 , where the first magnetic element  149  is disposed on the bracket  140 , and the second magnetic element  169  is correspondingly disposed on the drive connecting rod  160  or the door cover structure  150 , and corresponds to the first magnetic element  149  when being disposed in a closed position, so that when the door cover structure  150  is in the closed position, a closed state of the door cover structure  150  is further stabilized by the property of mutual attraction between the first magnetic element  149  and the second magnetic element  169 . In this embodiment, the second magnetic element  169  is correspondingly disposed on the drive connecting rod  160 , but this embodiment is not limited thereto. 
     Referring to  FIG.  5   , in some embodiments, the portable electronic device  100  further includes a waterproof elastic element  1471  disposed in the slide rail  147 . In this embodiment, the waterproof elastic element  1471  includes material such as rubber and foam, but the disclosure is not limited thereto. In some embodiments, the waterproof elastic element  1471  is disposed in the slide rail  147  from the outside of the bracket, and the waterproof elastic element  1471  is disposed in interference with the slide rail  147  to prevent water or moisture that permeates into the housing  110  through a bracket opening  148  from permeating to another place (in an embodiment, a circuit board) in the housing  110  through openings such as the slide rail  147  of the bracket  140 . In an embodiment, a waterproof elastic element is further disposed at a bottom portion of the bracket  140 , so that the bracket  140  is disposed in an interference fit between the bracket  140  and an element below the bracket (in an embodiment, a bottom plate of the portable electronic device  100 ), to prevent water and moisture that permeate into the housing  110  through the bracket opening  148  from permeating to another place in the housing  110  through the lower part of the bracket  140 . In another embodiment, in the disclosure, an interface between each movable element and another element (in an embodiment, a pivot joint between the drive connecting rod  160  and the bracket  140 ) is coated with high-viscosity lubricating oil, to fill up a gap between elements while lubricating, thereby achieving a waterproof effect. 
     Referring to  FIG.  6    to  FIG.  9   , this embodiment is similar to the above embodiments. Therefore, this embodiment follows the element symbols and partial contents of the above embodiments, same symbols are used for representing same or similar elements, and the descriptions of the same technical contents are omitted. 
     Referring to  FIG.  6    and  FIG.  7    first, in some embodiments, elements of the portable electronic device  100  are further modularized, that is, the door cover structure  150 , the drive connecting rod  160 , and other related heat dissipation components are assembled on the bracket  140 , and then are modularized and assembled into the portable electronic device  100  through the bracket  140  (in an embodiment, a bottom plate or a middle plate in the portable electronic device  100 ), so that complex assembly steps are simplified. Moreover, the modular design allows an entire module to be tested (in an embodiment, be subject to an operation test) before being assembled in the portable electronic device  100 , thereby improving the product yield. In this embodiment, the portable electronic device  100  includes a push rod  172  movably disposed on the bracket  140  and a linkage rod  176 . The linkage rod  176  is pivotally connected between the push rod  172  and the drive connecting rod  160 . Further, the drive connecting rod  160  further includes a driver  166  engaged with an axle end  162  of the drive connecting rod  160 . In such configuration, to cause the door cover structure  150  is to expose the heat dissipation opening  112  for heat dissipation, an external force F is applied to the stressed portion  1721  of the push rod  172  (manually or through a device such as the fan module  200 ), to move the push rod  172  in a moving direction D 1  toward the drive connecting rod  160 , so as to drive the linkage rod  176  to rotate and shift to a position shown in  FIG.  7   . Therefore, the driver  166  is pulled up to drive the axle end  162  of the drive connecting rod  160  to rotate in a rotation direction R 1 , so as to lift the door cover structure  150  upward. In this way, when the drive connecting rod  160  drives the door cover structure  150  to lift upward, the slider  152  of the door cover structure  150  moves (in an embodiment, roll) along the slide rail  147  of the bracket  140  in a moving direction D 1 , to further cause the door cover structure  150  to rotate and slide relative to the drive connecting rod  160  to open the door cover structure  150 , thereby improving the smoothness of the operation of the door cover structure  150 . 
     Referring to  FIG.  8   , in some embodiments, the portable electronic device  100  further includes a limiting member  145 , disposed on the bracket  140  to cover and fix at least a part of the drive connecting rod  160  and the linkage rod  176 , to prevent the drive connecting rod  160  and the linkage rod  176  from falling off during rotation, and to provide the effect of protecting movable elements. In some embodiments, the limiting member  145  is, in an embodiment, a cover body such as a stamped steel sheet, which is fixed on the bracket  140  by screwing. In some embodiments, the drive connecting rod  160 , the linkage rod  176 , and the push rod  172  are symmetrically disposed on two opposite sides of the bracket  140  to improve the smoothness of a stroke of the door cover structure  150  between a closed position shown in  FIG.  6    and an open position shown in  FIG.  7   . 
     Referring to  FIG.  8    and  FIG.  9   , in some embodiments, the drive connecting rod  160  further includes at least one elastic restoring member  168 , connected between the push rod  172  and the bracket  140 , so that after an external force of pushing the push rod  172  disappears, the push rod  172  and the door cover structure  150  are pulled back to the closed position shown in  FIG.  6    by an elastic restoring force of the elastic restoring member. In some embodiments, the portable electronic device  100  further includes at least one first magnetic element  149  and a second magnetic element  169 . The first magnetic element  149  is disposed on the bracket  140 , and the second magnetic element  169  is correspondingly disposed on the door cover structure  150 , and corresponds to the first magnetic element  149 , so that when the door cover structure  150  is in a closed position, a closed state of the door cover structure  150  is further stabilized by the property of mutual attraction between the first magnetic element  149  and the second magnetic element  169 . Further, the first magnetic element  149  is horizontally disposed on the bracket  140 , in an embodiment, and the second magnetic element  169  forms an acute angle with a vertical direction VL, that is, the second magnetic element  169  is not disposed perpendicular to the first magnetic element  149 , but is slightly inclined. In this configuration, when the second magnetic element  169  rotates with the door cover structure  150  from a closed position (shown in solid lines) to an open position (shown in dashed lines), it is ensured that the second magnetic element  169  is attracted by the first magnetic element  149  throughout the entire movement stroke, so that the stability of the door cover structure  150  during the movement is maintained. 
     Referring to  FIG.  10    to  FIG.  12   , this embodiment follows the element symbols and partial contents of the above embodiments, same symbols are used for representing same or similar elements, and the descriptions of the same technical contents are omitted. 
     In this embodiment, the portable electronic device  100  further includes a motor  180 , which is disposed on the bracket  140  and coupled to the drive connecting rod  160  to drive the drive connecting rod  160  to rotate between the closed position shown in  FIG.  10    and the open position shown in  FIG.  11   . In an embodiment, the motor  180  includes a driving gear  182 , and the drive connecting rod  160  correspondingly includes a driven gear  167 , where the driving gear  182  of the motor  180  structurally matches the driven gear  167  f the drive connecting rod  160 , to drive the drive connecting rod  160  to rotate. In such configuration, the motor  180  drives the driving gear  182  to rotate, to drive the drive connecting rod  160  to rotate through engagement between the driving gear  182  and the driven gear  167 , thereby driving the door cover structure  150  move between the closed position shown in  FIG.  10    and the open position shown in  FIG.  11   . In such configuration, when sensing that a temperature of the heating element is higher than a warning temperature, a temperature sensor of the portable electronic device  100  sends a heat dissipation signal to a controller, and the controller accordingly starts the motor  180  to drive the door cover structure  150  to automatically change from a closed position to an open position to facilitate heat dissipation. In another embodiment, driving of the motor  180  also cooperates with the above-mentioned fan module  200  to control opening and closing of the door cover structure  150 . In an embodiment, the portable electronic device  100  includes a sensing element (in an embodiment, a magnetic field sensing element or a pressure/contact sensing element), which is used to sense whether the fan module  200  is mounted on the portable electronic device  100 . When sensing that the fan module  200  is mounted on the portable electronic device  100 , the sensing element transmits a sensing signal to the controller, and the controller accordingly starts the motor  180  to drive the door cover structure  150  to automatically change from the closed position to the open position to facilitate heat dissipation. In this embodiment, the motor  180  is locked to the bracket  140  by a locking member  184 , and then, the bracket  140 , together with the motor, is locked in the housing  110  (in an embodiment, on a bottom plate in the housing  110 ) by a locking member  146  to achieve modular assembly. In some embodiments, the driving gear  182  and the driven gear  167  respectively include corresponding teeth to engage with each other and drive each other to rotate. In another embodiment, the driving gear  182  and the driven gear  167  are alternatively friction gears that drive each other to rotate through a friction force therebetween. This embodiment is not limited thereto. 
     In an embodiment, the portable electronic device  100  further includes a limiting member  145 , which is disposed on the bracket  140  to cover and fix the driving gear  182  and the driven gear  167 , to prevent the driving gear  182  and the driven gear  167  from falling off during rotation, and to provide the effect of protecting movable elements. In some embodiments, the limiting member  145  is, in an embodiment, a cover body such as a stamped steel sheet, which is fixed on the bracket  140  by screwing. 
     Referring to  FIG.  13    to  FIG.  19   , this embodiment is similar to the portable electronic device of the above embodiments. Therefore, this embodiment follows the element symbols and partial contents of the above embodiments, same symbols are used for representing same or similar elements, and the descriptions of the same technical contents are omitted. 
     Referring to  FIG.  13    to  FIG.  14    first, in some embodiments, the portable electronic device  100  further includes a magnetic element  192  and a magnetic field sensor  194 . The magnetic element  192  is disposed on the drive connecting rod  160  and is adapted to rotate with the drive connecting rod  160 . The magnetic field sensor  194  is disposed on a circuit board  191 , in an embodiment, and is configured to determine a state of the door cover structure  150  according to a change in a magnetic field of the magnetic element  192 . In this embodiment, the magnetic field sensor  194  is, in an embodiment, a Hall sensor or the like. Further, the portable electronic device  100  further includes a processor coupled to the magnetic field sensor  194 . In this way, when a state of the door cover structure  150  changes (in an embodiment, when the door cover structure  150  is opened or closed), the magnetic member  192  rotates with the drive connecting rod  160 , the magnetic field sensor  194  senses a change in a magnetic field of the magnetic member  192  and transmits a sensing signal to a processor accordingly. The processor determines a state of the door cover structure  150  accordingly. In such configuration, the processor determines whether the door cover structure  150  is in an open or a closed state according to a rotation angle of the drive connecting rod  160 , and even calculates any position of the door cover structure  150  in an opening or closing stroke. Therefore, when the door cover structure  150  is abnormally opened due to an impact, an improper operation, or another accident, the processor learns this situation using this mechanism (the cooperation between the magnetic element  192  and the magnetic field sensor  194 ), and closes the door cover structure  150 . When mounting accessories such as the fan module  200 , a user detects, by using this mechanism, whether the door cover structure  150  is fully opened. Moreover, this mechanism also controls the door cover structure  150  to stay at any angle to achieve operations such as a half-open state. 
     In an embodiment, the drive connecting rod  160  is coupled to a main connecting rod  161  of the driven gear  167 , where the driven gear  167  structurally matches the driving gear  182  of the motor  180  as described above, to be driven by the driving gear  182  to rotate. The main connecting rod  161  connects two opposite sides of the door cover structure  150 . In such configuration, when the driven gear  167  is driven by the motor  180  to rotate, the driven gear  167  drives the main connecting rod  161  of the drive connecting rod  160  to move (rotate to lift upward or downward), and further simultaneously drives the two opposite sides of the door cover structure  150  to move (upward or downward) together. That is, in this embodiment, the main connecting rod  161  connecting the two opposite sides of the door cover structure  150  is used, to directly transfer a driving force of the motor  180  in an axial direction of the main connecting rod  161  to the other side of the door cover structure  150 , thereby reducing the delay of transmission between parts due to an assembly gap. Therefore, the deflection of the door cover structure  150  is avoided, so that the operation of opening and closing the door cover structure  150  is smoother. 
     In an embodiment, the drive connecting rod  160  further includes an adapter  163  and a locking member  165 . The adapter  163  is coupled between the driven gear  167  and the main connecting rod  161 . The driven gear  167  rotates in an axial direction A 1 . The locking member  165  locks the adapter  163  on the main connecting rod  161  in a direction parallel to a radial direction A 2  of the driven gear  167 . The axial direction A 1  and the radial direction A 2  are substantially perpendicular to each other. Such a locking method (compared to a locking method in an axial direction of the driven gear  167 ) avoids the problem of loosening of the locking member  165  due to reciprocating rotation between the driven gear  167  and the main connecting rod  161 . The locking member  165  is, in an embodiment, a proper locking member such as a screw. 
     Referring to  FIG.  14    and  FIG.  15   , in some embodiments, the adapter  163  further includes a first end  1632  and a second end  1633  opposite to each other, and a buffer ring  1631  sleeved between the first end  1632  and the second end  1633 . In this embodiment, the first end  1632  is coupled to the main connecting rod  161 . The second end  1633  is coupled to the driven gear  167 , or a magnetic element  192  is disposed at the second end  1633 . The buffer ring  1631  is, in an embodiment, a rubber gasket, sleeved between the first end  1632  and the second end  1633  to provide frictional torque. In such configuration, through an interference fit between the buffer ring  1631  and the bracket  140 , the frictional torque provided by the buffer ring  1631  causes the door cover structure  150  to stay in any state (position) between opening and closing, and the door cover structure  150  does not shake or fall due to the gravity or another external force. 
     In an embodiment, the door cover structure  150  further includes an elastic member such as rubber, which is disposed on a surface of the door cover structure  150  facing the bracket  140  (in an embodiment, two opposite side surfaces). In other words, the elastic member is fitted between the door cover structure  150  and the bracket  140  to provide friction when the door cover structure  150  moves (rotate and/or shift) relative to the bracket  140 , thereby improving the stability of the door cover structure  150  during movement. In some embodiments, a body of the adapter  163  and the buffer ring  1631  include limiting structures (in an embodiment, a rib  1634  shown in  FIG.  15    or another proper limiting structure) that match each other, to prevent the body of the adapter  163  from falling off the buffer ring  1631 . In an embodiment, the buffer ring  1631  is formed by molding rubber on the metal adapter  163  through in-mold injection or injection molding, or the buffer ring  1631  is made separately and then be fitted on the adapter  163 , which is not limited in this embodiment. 
     In addition, in some embodiments, the main connecting rod  161  and the adapter  163  limiting structures (in an embodiment, the rib  1635  shown in  FIG.  15    or another proper limiting structure) that match each other, to prevent the main connecting rod  161  and the adapter  163  from being misaligned during assembly. In addition, in some embodiments, the buffer ring  1631  that is radially stressed on the adapter  163  also achieves the effect of waterproofing. In an embodiment, the buffer ring  1631  is coated with high-viscosity lubricating oil or another medium to reduce damage suffered by the buffer ring  1631  during assembly or rotation and also fill up a gap caused by an interference fit or a part tolerance, thereby achieving the effect of waterproofing. 
     Referring to  FIG.  16   , in an embodiment, the portable electronic device  100  further includes at least one first magnetic element  149  and a second magnetic element  156  that attract each other. In this embodiment, the first magnetic element  149  is disposed on the bracket  140 , and the second magnetic element  156  is correspondingly disposed on the door cover structure  150 , and corresponds to the first magnetic element  149  when being disposed in a closed position, so that when the door cover structure  150  is in the closed position, a closed state of the door cover structure  150  is further stabilized by the property of mutual attraction between the first magnetic element  149  and the second magnetic element  156 . Therefore, a risk of opening the door cover structure  150  by accident (collision or misoperation) is reduced. A plurality of attraction combinations of magnetic elements (in an embodiment, the magnetic element  149  on the bracket and the magnetic element  156  on the corresponding door cover structure  150  and/or the magnetic element  169  on the corresponding drive connecting rod  160 ) of the disclosure does not necessarily need to exist at the same time provided that an attraction force between the magnetic elements is sufficient to achieve the objective of stabilizing the door cover structure  150 . 
     Referring to  FIG.  14    and  FIG.  17   , in an embodiment, the slider  152  of the door cover structure  150  is implemented in a form of a retractable slide rod  151 , and extends through the two opposite sides of the door cover structure  150  to be slidably disposed on the slide rail  147  of the bracket  140 . Specifically, the retractable slide rod  151  is a rod with an internal compression spring, and two opposite ends of the retractable slide rod  151  (slider  152 ) are completely retracted after being stressed, and spring back to an initial state (original length) when an external force disappears. In this way, during assembly, two ends of the retractable slide rod  151  (slider  152 ) are retracted first. Then after the retractable slide rod  151  is pushed to corresponding door holes of the door cover structure  150 , the internal spring is released, so that the two opposite ends (slider  152 ) pass through the corresponding door holes and enter the slide rails  147  of the bracket  140 , thereby improving the assembly efficiency. The retractable slide rod  151  moves (roll)s in the slide rails  147 , to improve the smoothness of the operation of the door cover structure  150 . 
     Referring to  FIG.  18   , in some embodiments, the portable electronic device  100  further includes a pivot member  198  pivotally connected between the drive connecting rod  160  (in an embodiment, the main connecting rod  161 ) and the door cover structure  150 . The pivot member  198  respectively passes through the drive connecting rod  160  and the door cover structure  150  and includes a neck with a smaller outer diameter for a fastener  1981  to be buckled on the neck, thereby preventing the pivot member  198  from falling off. In addition, other parts of the pivot member  198  are respectively pivotally connected to the drive connecting rod  160  and the door cover structure  150  to rotate relative to each other. 
     In an embodiment, the design of the buckle ring  1981  provide friction and torque for a pivot connection between the drive connecting rod  160  and the door cover structure  150 , to increase the stability of the door cover structure  150  during operation. In addition, in another embodiment, the pivot member  198  is alternatively directly welded to one of the drive connecting rod  160  or the door cover structure  150 . In another embodiment, the pivot member is alternatively, in an embodiment, a stamped cylindrical structure that respectively passes through the drive connecting rod  160  and the door cover structure  150  and that has limiting side skirts manufactured by riveting. The disclosure does not limit a form of the pivot member. 
     Referring to  FIG.  14    and  FIG.  19   , in an embodiment, the portable electronic device  100  further includes an intermediate gear  188 , disposed between the driving gear  182  and the driven gear  167 , and configured to respectively match the driving gear  182  and the driven gear  167  structure, so that the driving gear  182  drives the driven gear  167  to rotate through the intermediate gear  188 . In this configuration, the center distance and the gear size of the intermediate gear  188  are designed to reduce the individual volumes of individual gears, so that a gear set (the driving gear  182 , the intermediate gear  188 , and the driven gear  167 ) is completely accommodated between the body of the bracket  140  and a limiting member (the limiting member  145  shown in  FIG.  12   ). 
     In addition, in some embodiments, the driving gear  182  includes an elastic core portion  1821  engaged with a drive shaft of the motor  180  and a gear portion  1822  surrounding the elastic core portion  1821 . The elastic core portion  1821  and the gear portion  1822  are made of different materials. In an embodiment, the material of the elastic core portion  1821  include plastic materials such as polyoxymethylene (POM), and the material of the gear portion  1822  includes metal materials such as stainless steel and iron-nickel alloy. In this way, the property that the elastic core portion  1821  is prone to deform locally is used, so that the driving gear  182  and the drive shaft of the motor  180  are tightly matched, to reduce an idle stroke in the transmission. The gear portion  1822  is made of materials with higher breaking strength, such as metal, to achieve wear resistance. In this embodiment, a buckle position is designed between the elastic core portion  1821  and the gear portion  1822 . After being machined, metal is placed in a plastic injection mold, and is then manufactured through embedding and injection. In another embodiment, the driving gear  182  is alternatively entirely made of plastic materials such as POM. This method reduces running noise of the driving gear  182  and costs of parts. Referring to  FIG.  14    again, in some embodiments, the portable electronic device  100  further includes a ball bearing  186 , which is assembled at a junction of the bracket  140  and the motor  180 . The ball bearing  186  is used to surround a drive shaft of the rotating motor  180 , so that the drive shaft of the motor  180  rotates stably, and further has the function of stabilizing the rotation of the driving gear  182 . 
     In summary, a housing of a portable electronic device disclosed in the disclosure includes a heat dissipation opening, used to expose at least a part of the heat dissipation element in the housing. In addition, the portable electronic device further includes a door cover structure, and drives the door cover structure to move (shift and/or rotate) through a drive connecting rod pivotally connected between the bracket and the door cover structure to cover or expose the heat dissipation opening. Elements, such as the door cover structure and the drive connecting rod, are assembled in the portable electronic device in a modular manner through the bracket. When the portable electronic device has a relatively high heat dissipation requirement, the door cover structure is opened manually or automatically to enhance heat dissipation efficiency. Moreover, the modular design not only simplifies cumbersome assembly steps, but also allows an entire module to be tested (in an embodiment, be subject to an operation test) before being assembled in the portable electronic device, thereby improving the product yield. 
     In addition, the portable electronic device further includes a fan module sleeved on the housing. In this way, when there is a relatively high need for heat dissipation, the fan module is sleeved on the housing to be combined with the portable electronic device and help the portable electronic device dissipate heat. In addition, in some embodiments, the portable electronic device drives the door cover structure to rotate to an open position while assembling the fan module on the housing, thereby improving the operating convenience of the device.