Abstract:
A mouse device with a movable button is provided. The mouse device includes a mouse body for supporting a user&#39;s palm, a first casing, and a first button covering the first casing. The first casing is connected with a body front end of the mouse body, and movable with respect to the mouse body along the body front end. As such, the position of the first button with respect to the mouse body is adjustable. According to the size of the user&#39;s palm, the position of the button is determined.

Description:
FIELD OF THE INVENTION 
     The present invention relates to a mouse device, and more particularly to a mouse device with a movable button. 
     BACKGROUND OF THE INVENTION 
     As known, the common computer input device includes for example a mouse device, a keyboard, a trackball, a touchpad, and the like. Among these input devices, the mouse device is the most prevailing because it complies with the usual practices of most users. When a mouse device is held by a user&#39;s palm, the user may move the mouse device to control movement of the cursor shown on the computer screen. 
       FIG. 1  is a schematic diagram illustrating the connection between a conventional mouse device and a computer system. The computer system  2  comprises a computer host  21  and a computer monitor  22 . The computer host  21  is in communication with a wheel mouse device  1  and the computer monitor  22 . A cursor  221  is displayed on the computer monitor  22 . The wheel mouse device  1  is used for controlling the cursor  221  to have the computer host  21  execute a corresponding instruction. The wheel mouse device  1  comprises a mouse body  10 , a left button  11  and a right button  12 . The mouse body  10  is used for supporting a user&#39;s palm. When the mouse body  10  is moved by the user to result in a displacement amount, the computer host  21  correspondingly moves the cursor  221  shown on the computer monitor  22  according to the displacement amount. By clicking the left button  11  or the right button  12 , a control signal is issued to the computer host  21 . In response to the control signal, the computer host  21  executes a corresponding instruction. The basic functions of the wheel mouse device have been described above. 
     Generally, for different users, the size of the palms and the length of the fingers are different. Since the mouse body of the common mouse device has a fixed size, the mouse device may only comply with the palms and fingers of specified users. In other words, the size of the mouse body of such a mouse device fails to comply with the palms and fingers of some other users. If the unsuitable mouse device is used for a long time period, the procedure of operating the mouse device usually incurs unacceptable fatigue of the user&#39;s hand. 
     Therefore, there is a need of providing a mouse device for complying with various-sized palms. 
     SUMMARY OF THE INVENTION 
     It is an object of the present invention to provide a mouse device with a movable button in order to comply with various-sized palms. 
     In accordance with an aspect of the present invention, there is provided a mouse device with a movable button. The mouse device is in communication with a computer host. The mouse device includes a mouse body, a first casing, a first button, a first circuit board and a first switch. The mouse body includes a body base and a body upper cover. The body base is covered by the body upper cover. The body upper cover has a body front end and a body rear end. The first casing is connected with the body front end of the mouse body, and movable with respect to the mouse body along the body front end. The first button is disposed on the first casing and covers the first casing. The first circuit board is disposed within the first casing. The first switch is mounted on the first circuit board to be triggered by the first button. The first casing is separated from the body rear end of the mouse body. 
     In an embodiment, the mouse body further includes a first fixing hole and a first sliding groove. In addition, the first casing includes a first rotating part and a first sliding part. The first rotating part is inserted within the mouse body through the body front end, and coupled with the first fixing hole. The first sliding part is arranged between the first button and the first rotating part, inserted within the mouse body through the body front end, and coupled with the first sliding groove. The first rotating part is rotatable with respect to the first fixing hole, so that the first casing is movable with respect to the mouse body. 
     In an embodiment, the first rotating part has a first protrusion inserted into the first fixing hole, so that the first casing and the mouse body are combined together. In addition, the first protrusion is rotatable with respect to the first fixing hole, so that the first casing is movable with respect to the mouse body. 
     In an embodiment, the first sliding groove further includes a first saw-toothed structure, and the first sliding part further includes a first salient. When the first casing is moved with respect to the mouse body, the first sliding part is moved in the first sliding groove, and the first salient is engaged with the first saw-toothed structure to fix the first casing. 
     In an embodiment, the first rotating part includes a first coupling hole and a first rotating shaft. A first end of the first rotating shaft is inserted into the first fixing hole. A second end of the first rotating shaft is inserted into the first coupling hole. The first end of the first rotating shaft and the first fixing hole are connected with each other to be synchronously rotated. The second end of the first rotating shaft and the first coupling hole are connected with each other to be synchronously rotated. The second end of the first rotating shaft is rotatable with respect the first end of the first rotating shaft, so that the first casing is movable with respect to the mouse body. 
     In an embodiment, the first sliding part includes a first slot, and the first sliding groove includes a first fixing post. When the first casing is moved with respect to the mouse body and the first sliding part is moved in the first sliding groove, the first fixing post is inserted into the first slot, so that the first sliding part is fixed in the first sliding groove. 
     In an embodiment, the mouse device further includes a second casing, a second button, a second circuit board and a second switch. The second casing is connected with the body front end of the mouse body, arranged beside the first casing, and movable with respect to the mouse body along the body front end. The second button is disposed on the second casing and covers the second casing. The second circuit board is disposed within the second casing. The second switch is mounted on the second circuit board to be triggered by the second button. The second casing is separated from the body rear end of the mouse body. 
     In an embodiment, the mouse body further includes a second fixing hole and a second sliding groove. In addition, the second casing includes a second rotating part and a second sliding part. The second rotating part is inserted within the mouse body through the body front end, and coupled with the second fixing hole. The second sliding part is arranged between the second button and the second rotating part, inserted within the mouse body through the body front end, and coupled with the second sliding groove. The second rotating part is rotatable with respect to the second fixing hole, so that the second casing is movable with respect to the mouse body. 
     In an embodiment, the second rotating part has a second protrusion inserted into the second fixing hole, so that the second casing and the mouse body are combined together. In addition, the second protrusion is rotatable with respect to the second fixing hole, so that the second casing is movable with respect to the mouse body. 
     In an embodiment, the second sliding groove further includes a second saw-toothed structure, and the second sliding part further includes a second salient. When the second casing is moved with respect to the mouse body, the second sliding part is moved in the second sliding groove, and the second salient is engaged with the second saw-toothed structure to fix the second casing. 
     In an embodiment, the second rotating part includes a second coupling hole and a second rotating shaft. A first end of the second rotating shaft is inserted into the second fixing hole. A second end of the second rotating shaft is inserted into the second coupling hole. The first end of the second rotating shaft and the second fixing hole are connected with each other to be synchronously rotated. The second end of the second rotating shaft and the second coupling hole are connected with each other to be synchronously rotated. The second end of the second rotating shaft is rotatable with respect the first end of the second rotating shaft, so that the second casing is movable with respect to the mouse body. 
     In an embodiment, the second sliding part includes a second slot, and the second sliding groove includes a second fixing post. When the second casing is moved with respect to the mouse body and the second sliding part is moved in the second sliding groove, the second fixing post is inserted into the second slot, so that the second sliding part is fixed in the second sliding groove. 
     In an embodiment, the mouse body further includes a mouse body circuit board and an optical displacement sensing module. The optical displacement sensing module is mounted on the mouse body circuit board for detecting a motion of the mouse body, thereby generating a cursor signal. The first casing further includes a first connecting wire. A first terminal of the first connecting wire is connected to the first circuit board. A second terminal of the first connecting wire is connected to the mouse body circuit board. The first switch generates a first triggering signal when the first button is pressed to trigger the first switch. The first triggering signal is transmitted to the mouse body circuit board through the first connecting wire. The second casing further includes a second connecting wire. A first terminal of the second connecting wire is connected to the second circuit board. A second terminal of the second connecting wire is connected to the mouse body circuit board. The second switch generates a second triggering signal when the second button is pressed to trigger the second switch. The second triggering signal is transmitted to the mouse body circuit board through the second connecting wire. 
     In an embodiment, the mouse body further includes a mouse body connecting wire, which is arranged between the first casing and the second casing. The mouse body connecting wire is connected to a computer host, so that the first triggering signal, the second triggering signal and the cursor signal are transmitted to the computer host through the mouse body connecting wire. 
     In an embodiment, the mouse body further includes a wireless signal transmitter for outputting the first triggering signal, the second triggering signal and the cursor signal. In addition, a wireless signal receiver is connected to the computer host for receiving the first triggering signal, the second triggering signal and the cursor signal. 
     The above objects and advantages of the present invention will become more readily apparent to those ordinarily skilled in the art after reviewing the following detailed description and accompanying drawings, in which: 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic diagram illustrating the connection between a conventional mouse device and a computer system; 
         FIG. 2  is a schematic perspective view illustrating the outward appearance of a mouse device with a movable button according to a first embodiment of the present invention; 
         FIG. 3  is a schematic exploded view illustrating the mouse device with a movable button according to the first embodiment of the present invention; 
         FIG. 4  is a schematic perspective view illustrating the first casing and the second casing of the mouse device with a movable button according to the first embodiment of the present invention, which is taken in another viewpoint; 
         FIG. 5  is a schematic top view illustrating the internal components of the mouse device with a movable button according to the first embodiment of the present invention, in which the mouse device is in a first operating status; 
         FIG. 6  is a schematic top view illustrating the outward appearance of the mouse device with a movable button according to the first embodiment of the present invention, in which the mouse device is in the first operating status; 
         FIG. 7  is a schematic top view illustrating the internal components of the mouse device with a movable button according to the first embodiment of the present invention, in which the mouse device is in a second operating status; 
         FIG. 8  is a schematic top view illustrating the outward appearance of the mouse device with a movable button according to the first embodiment of the present invention, in which the mouse device is in the second operating status; 
         FIG. 9  is a schematic exploded view illustrating the mouse device with a movable button according to a second embodiment of the present invention; 
         FIG. 10  is a schematic perspective view illustrating the first casing and the second casing of the mouse device with a movable button according to the second embodiment of the present invention, which is taken in another viewpoint; 
         FIG. 11  is a schematic top view illustrating the internal components of the mouse device with a movable button according to the second embodiment of the present invention, in which the mouse device is in a first operating status; and 
         FIG. 12  is a schematic top view illustrating the internal components of the mouse device with a movable button according to the second embodiment of the present invention, in which the mouse device is in a second operating status. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     For obviating the drawbacks encountered from the prior art, the present invention provides a mouse device with a movable button.  FIG. 2  is a schematic perspective view illustrating the outward appearance of a mouse device with a movable button according to a first embodiment of the present invention. As shown in  FIG. 2 , the mouse device  3  is in communication with a computer host  41 . A wireless signal receiver  306  is connected with the computer host  41 . The mouse device  3  comprises a mouse body  30 , a first casing  31 , a first button  32 , a second casing  35  (see  FIG. 3 ) and a second button  36 . The mouse body  30  comprises a body base  301  and a body upper cover  302 . The body upper cover  302  is disposed on the body base  301  and covers the body base  301 . The body upper cover  302  has a body front end  3021  and a body rear end  3022 . The first casing  31  is connected with the body front end  3021  of the mouse body  30 . In addition, the first casing  31  is movable with respect to the mouse body  30  along the body front end  3021 . The first button  32  is disposed on the first casing  31  and covers the first casing  31 . The second casing  35  is connected with the body front end  3021  of the mouse body  30 , and arranged beside the first casing  31 . In addition, the second casing  35  is movable with respect to the mouse body  30  along the body front end  3021 . The second button  36  is disposed on the second casing  35  for covering the second casing  35 . 
     Hereinafter, the internal structures of the mouse device  3  will be illustrated with reference to  FIGS. 3 and 4 .  FIG. 3  is a schematic exploded view illustrating the mouse device with a movable button according to the first embodiment of the present invention.  FIG. 4  is a schematic perspective view illustrating the first casing and the second casing of the mouse device with a movable button according to the first embodiment of the present invention, which is taken in another viewpoint. As shown in  FIG. 3 , the mouse device  3  further comprises a first circuit board  33 , a first switch  34 , a second circuit board  37  and a second switch  38 . The mouse body  30  comprises a mouse body circuit board  303 , an optical displacement sensing module  304  and a wireless signal transmitter  305 . The displacement sensing module  304  and the wireless signal transmitter  305  are disposed on the mouse body circuit board  303 . The displacement sensing module  304  is used for detecting the motion of the mouse body  30 , thereby generating a cursor signal. The wireless signal transmitter  305  is used for emitting the cursor signal to the wireless signal receiver  306 . As such, the cursor signal is transmitted to the computer host  41 . 
     Please refer to  FIGS. 3 and 4 . The body base  301  comprises a first fixing hole  3011 , a first sliding groove  3012 , a second fixing hole  3013  and a second sliding groove  3014 . The first sliding groove  3012  comprises a first fixing post  3012 A and a first saw-toothed structure  3012 B. The first casing  31  comprises a first rotating part  311 , a first sliding part  312  and a first connecting wire  313 . The first sliding part  312  is arranged between the first button  32  and the first rotating part  311 . The first rotating part  311  is inserted within the mouse body  30  through the body front end  3021 , and coupled with the first fixing hole  3011 . Especially, the first rotating part  311  has a first protrusion  3111 . The first protrusion  3111  is inserted into the first fixing hole  3011 , so that the first casing  31  and the body base  301  are combined together. The first sliding part  312  has a first slot  3121  and a first salient  3122 . The first slot  3121  is used for accommodating the first fixing post  3012 A. The first salient  3122  is engaged with the first saw-toothed structure  3012 B. In this embodiment, the first saw-toothed structure  3012 B has four indentations. 
     The second sliding groove  3014  comprises a second fixing post  3014 A and a second saw-toothed structure  3014 B. The second casing  35  comprises a second rotating part  351 , a second sliding part  352  and a second connecting wire  353 . The second sliding part  352  is arranged between the second button  36  and the second rotating part  351 . The second rotating part  351  is inserted within the mouse body  30  through the body front end  3021 , and coupled with the second fixing hole  3013 . Especially, the second rotating part  351  has a second protrusion  3511 . The second protrusion  3511  is inserted into the second fixing hole  3013 , so that the second casing  35  and the body base  301  are combined together. The second sliding part  352  has a second slot  3521  and a second salient  3522 . The second slot  3521  is used for accommodating the second fixing post  3014 A. The second salient  3522  is engaged with the second saw-toothed structure  3014 B. In this embodiment, the second saw-toothed structure  3014 B has four indentations. 
     The relationships between the internal components of the mouse device  3  will be illustrated with reference to  FIG. 5 .  FIG. 5  is a schematic top view illustrating the internal components of the mouse device with a movable button according to the first embodiment of the present invention, in which the mouse device is in a first operating status. The first circuit board  33  is disposed within the first casing  31 . The first switch  34  is mounted on the first circuit board  33  to be triggered by the first button  32 . A first terminal of the first connecting wire  313  is connected to the first circuit board  33 . A second terminal of the first connecting wire  313  is connected to the mouse body circuit board  303 . The first rotating part  311  of the first casing  31  is inserted within the mouse body  30  through the body front end  3021 , and the first protrusion  3111  of the first rotating part  311  is inserted into the first fixing hole  3011 , so that the first casing  31  and the mouse body  30  are combined together. In addition, the first sliding part  312  is coupled with the first sliding groove  3012 , the first salient  3122  is engaged with the first saw-toothed structure  3012 B, and the first fixing post  3012 A is inserted into the first slot  3121 . As a consequence, the first sliding part  312  is fixed in the first sliding groove  3012  to avoid detachment of the first sliding part  312  from the first sliding groove  3012 . 
     On the other hand, the second circuit board  37  is disposed within the second casing  35 . The second switch  38  is mounted on the second circuit board  37  to be triggered by the second button  36 . A first terminal of the second connecting wire  353  is connected to the second circuit board  37 . A second terminal of the second connecting wire  353  is connected to the mouse body circuit board  303 . The second rotating part  351  of the second casing  35  is inserted within the mouse body  30  through the body front end  3021 , and the second protrusion  3511  of the second rotating part  351  is inserted into the second fixing hole  3013 , so that the second casing  35  and the mouse body  30  are combined together. In addition, the second sliding part  352  is coupled with the second sliding groove  3014 , the second salient  3522  is engaged with the second saw-toothed structure  3014 B, and the second fixing post  3014 A is inserted into the second slot  3521 . As a consequence, the second sliding part  352  is fixed in the second sliding groove  3014  to avoid detachment of the second sliding part  352  from the second sliding groove  3014 . 
     In a case that the mouse device  3  is in a first operating status, the first casing  31  and the second casing  35  are contacted with each other. Meanwhile, as shown in  FIG. 5 , the first sliding part  312  is arranged at the rightmost position of the first sliding groove  3012 , and the first fixing post  3012 A is arranged at the leftmost position of the first slot  3121 . In addition, the second sliding part  352  is arranged at the leftmost position of the second sliding groove  3014 , and the second fixing post  3014 A is arranged at the rightmost position of the second slot  3521 . Afterwards, the body base  301  is covered by the body upper cover  302 . 
       FIG. 6  is a schematic top view illustrating the outward appearance of the mouse device with a movable button according to the first embodiment of the present invention, in which the mouse device is in the first operating status. The mouse device  3  in the first operating status is feasible to a female user. For operating the mouse device  3  by a female user, the palm P of the female user is placed on the body upper cover  302  of the mouse body  30  such that the palm P is supported by the mouse body  30 , and a first finger F 1  and a second finger F 2  of the female user are respectively placed on the first casing  31  and the second casing  35 . When the mouse body  30  is moved by the palm P, the optical displacement sensing module  304  issues a cursor signal in response to the motion of the mouse body  30 . When the first button  32  is pressed by the first finger F 1 , the first switch  34  is triggered by the first button  32  to generate a first triggering signal. The first triggering signal will be transmitted from the first circuit board  33  to the mouse body circuit board  303  through the first connecting wire  313 . Whereas, when the second button  36  is pressed by the second finger F 2 , the second switch  38  is triggered by the second button  36  to generate a second triggering signal. The second triggering signal will be transmitted from the second circuit board  37  to the mouse body circuit board  303  through the second connecting wire  353 . The first triggering signal, the second triggering signal and the cursor signal are transmitted from the wireless signal transmitter  305  (see  FIG. 5 ), which is mounted on the mouse body circuit board  303 , to the wireless signal receiver  306  (see  FIG. 2 ). As such, the first triggering signal, the second triggering signal and the cursor signal could be transmitted to the computer host  41 . 
     However, the mouse device  3  in the first operating status is not feasible to a male user because the male user has a larger palm P′, a longer first finger F 1 ′ and a longer second finger F 2 ′ when compared with the female user. When the palm P′ of the male user is placed on the mouse body  30  and the first finger F 1 ′ and the second finger F 2 ′ are respectively placed on the first casing  31  and the second casing  35  to operate the mouse device  3  in the first operating status, the palm P′ of the male user may be supported by the mouse body  30 . However, the first finger F 1 ′ and the second finger F 2 ′ should be excessively bent to be respectively placed on the first casing  31  and the second casing  35  because the mouse device  3  in the first operating status is only feasible to the smaller palm P, the shorter first finger F 1  and the shorter second finger F 2 . In other words, the use of the improper mouse device may incur hand fatigue of the male user. 
     For facilitating the male user to operate the mouse device  3 , the male user may move the first casing  31  and the second casing  35 . As such, the first rotating part  311  and the second rotating part  351  are respectively rotated with respect to the first fixing hole  3011  and the second fixing hole  3013 , and the first sliding part  312  and the second sliding part  351  are respectively slid in the first sliding groove  3012  and the second sliding groove  3014 . Since the first casing  31  and the second casing  35  are moved with respect to the mouse body  30  along the body front end  3021  of the mouse body  30 , the mouse device  3  is switched from the first operating status to the second operating status (see  FIG. 7 ). As shown in  FIG. 7 , the mouse device  3  is in a second operating status. Meanwhile, the first casing  31  and the second casing  35  are separated from each other. That is, the first sliding part  312  is arranged at the leftmost position of the first sliding groove  3012 , the first fixing post  3012 A is arranged at the rightmost position of the first slot  3121 , the second sliding part  352  is arranged at the rightmost position of the second sliding groove  3014 , and the second fixing post  3014 A is arranged at the leftmost position of the second slot  3521 . Since the first salient  3122  is moved from the rightmost indentation of the first saw-toothed structure  3012 B to the leftmost indentation of the first saw-toothed structure  3012 B, the first casing  31  is fixed at a specified position. In addition, since the second salient  3522  is moved from the leftmost indentation of the second saw-toothed structure  3014 B to the rightmost indentation of the second saw-toothed structure  3014 B, the second casing  35  is fixed at another specified position. 
       FIG. 8  is a schematic top view illustrating the outward appearance of the mouse device with a movable button according to the first embodiment of the present invention, in which the mouse device is in the second operating status. When the mouse device  3  is in the second operating status, the first finger F 1 ′ and the second finger F 2 ′ of the male user may be slightly bent to be placed on the first casing  31  and the second casing  35 . In addition, the palm P′ could be supported on the mouse body  30 , and the gesture of the palm P′ is not altered in response to the movement of the first casing  31  and the second casing  35 . In other words, the male user may feel more comfortable when the mouse device  3  is used. 
     From the above embodiments, the mouse device with a movable button according to the present invention may comply with different users of various-sized palms. Moreover, since each of the first saw-toothed structure  3012 B and the second saw-toothed structure  3014 B has four indentations, the first casing  31  and the second casing  35  could be respectively switched between four different positions of the body front end  3021 . In other words, the outward profile of the mouse device may comply with different users of various-sized palms. 
     The present invention further provides a second embodiment of the mouse device.  FIG. 9  is a schematic exploded view illustrating the mouse device with a movable button according to a second embodiment of the present invention. As shown in  FIG. 9 , the mouse device  5  comprises a mouse body  50 , a first casing  51 , a first button  52 , a first circuit board  53 , a first switch  54 , a second casing  55 , a second button  56 , a second circuit board  57  and a second switch  58 . The mouse body  50  comprises a body base  501 , a body upper cover  502 , a mouse body circuit board  503 , an optical displacement sensing module  504  and a mouse body connecting wire  505 . The body upper cover  502  is disposed on the body base  501  and covers the body base  501 . The body upper cover  502  has a body front end  5021  and a body rear end  5022 . The displacement sensing module  504  is disposed on the mouse body circuit board  503 . The displacement sensing module  504  is used for detecting the motion of the mouse body  50 , thereby generating a cursor signal. The mouse body connecting wire  505  is connected to a computer host (not shown). Via the mouse body connecting wire  505 , associated signals could be transmitted from the mouse device  3  to the computer host. The body base  501  comprises a first fixing hole  5011 , a first sliding groove  5012 , a second fixing hole  5013  and a second sliding groove  5014 . In addition, the first sliding groove  5012  comprises a first fixing post  5012 A, and the second sliding groove  5014  comprises a second fixing post  5014 A. 
       FIG. 10  is a schematic perspective view illustrating the first casing and the second casing of the mouse device with a movable button according to the second embodiment of the present invention, which is taken in another viewpoint. Please refer to  FIGS. 9 and 10 . The first casing  51  comprises a first rotating part  511 , a first sliding part  512  and a first connecting wire  513 . The first sliding part  512  is arranged between the first button  52  and the first rotating part  511 . The first rotating part  511  comprises a first coupling hole  5111  and a first rotating shaft  5112 . The first sliding part  512  comprises a first slot  5121 . The second casing  55  comprises a second rotating part  551 , a second sliding part  552  and a second connecting wire  553 . The second rotating part  551  comprises a second coupling hole  5511  and a second rotating shaft  5512 . The second sliding part  552  comprises a second slot  5521 . 
     Hereinafter, the internal structures of the mouse device  5  will be illustrated in more details with reference to  FIG. 11 .  FIG. 11  is a schematic top view illustrating the internal components of the mouse device with a movable button according to the second embodiment of the present invention, in which the mouse device is in a first operating status. The first circuit board  53  is disposed within the first casing  51 . The first switch  54  is mounted on the first circuit board  53  to be triggered by the first button  52 . A first terminal of the first connecting wire  513  is connected to the first circuit board  53 . A second terminal of the first connecting wire  513  is connected to the mouse body circuit board  503 . The first rotating part  511  of the first casing  51  is inserted within the mouse body  50  through the body front end  5021 . A first end  5112 A of the first rotating shaft  5112  is inserted into the first fixing hole  5011 , and a second end  5112 B of the first rotating shaft  5112  is inserted into the first coupling hole  5111 . The first end  5112 A of the first rotating shaft  5112  and the first fixing hole  5011  are connected with each other to be synchronously rotated. The second end  5112 B of the first rotating shaft  5112  and the first coupling hole  5111  are connected with each other to be synchronously rotated. In addition, the second end  5112 B of the first rotating shaft  5112  is rotatable with respect to the first end  5112 A. As such, the first casing  51  is movable with respect to body front end  5021  of the mouse body  50 . When the first casing  51  and the mouse body  50  are combined together, the first sliding part  512  is coupled with the first sliding groove  5012 , and the first fixing post  5012 A is inserted into the first slot  5121 . As a consequence, the first sliding part  512  is fixed in the first sliding groove  5012  to avoid detachment of the first sliding part  512  from the first sliding groove  5012 . 
     On the other hand, the second circuit board  57  is disposed within the second casing  55 . The second switch  58  is mounted on the second circuit board  57  to be triggered by the second button  56 . A first terminal of the second connecting wire  553  is connected to the second circuit board  57 . A second terminal of the second connecting wire  553  is connected to the mouse body circuit board  503 . The second rotating part  551  of the second casing  55  is inserted within the mouse body  50  through the body front end  5021 . A first end  5512 A of the second rotating shaft  5512  is inserted into the second fixing hole  5013 , and a second end  5512 B of the second rotating shaft  5512  is inserted into the second coupling hole  5511 . The first end  5512 A of the second rotating shaft  5512  and the second fixing hole  5013  are connected with each other to be synchronously rotated. The second end  5512 B of the second rotating shaft  5512  and the second coupling hole  5511  are connected with each other to be synchronously rotated. In addition, the second end  5512 B of the second rotating shaft  5512  is rotatable with respect to the first end  5512 A. As such, the second casing  51  is movable with respect to body front end  5021  of the mouse body  50 . When the second casing  55  and the mouse body  50  are combined together, the second sliding part  552  is coupled with the second sliding groove  5014 , and the second fixing post  5014 A is inserted into the second slot  5521 . As a consequence, the second sliding part  552  is fixed in the second sliding groove  5014  to avoid detachment of the first sliding part  552  from the second sliding groove  5014 . 
     The mouse device  5  in the first operating status is feasible to a female user that has a smaller palm. In a case that the mouse device  5  is in the first operating status, the first casing  51  and the second casing  55  are contacted with each other. Meanwhile, the first sliding part  512  is arranged at the rightmost position of the first sliding groove  5012 , and the first fixing post  5012 A is arranged at the leftmost position of the first slot  5121 . In addition, the second sliding part  552  is arranged at the leftmost position of the second sliding groove  5014 , and the second fixing post  5014 A is arranged at the rightmost position of the second slot  5521 . 
     When the mouse device  5  is operated, a cursor signal is issued in response to the motion of the mouse body  50 . When the first button  52  is pressed, the first switch  54  is triggered to generate a first triggering signal. When the second button  56  is pressed, the second switch  58  is triggered to generate a second triggering signal. The first triggering signal, the second triggering signal and the cursor signal are transmitted to the computer host through the mouse body connecting wire  505 , so that the computer host executes a corresponding instruction. 
     For facilitating the male user that has a larger palm to operate the mouse device  5 , the male user may move the first casing  51  and the second casing  55 . As such, the first rotating part  511  and the second end  5112 B of the first rotating shaft  5112  are rotated with respect to the first fixing hole  5011  and the first end  5112 A of the first rotating shaft  5112 , and the second rotating part  551  and the second end  5512 B of the second rotating shaft  5512  are rotated with respect to the second fixing hole  5013  and the first end  5512 A of the second rotating shaft  5512 . In addition, the first sliding part  512  is slid in the first sliding groove  5012 , and the second sliding part  552  is slid in the second sliding groove  5014 . Since the first casing  51  and the second casing  55  are moved with respect to the mouse body  50  along the body front end  5021  of the mouse body  50 , the mouse device  5  is switched from the first operating status to the second operating status (see  FIG. 12 ). 
     By the way, in the first rotating shaft  5112 , a viscous fluid (not shown) is filled in the region between the second end  5112 B of the first rotating shaft  5112  and the first end  5112 A of the first rotating shaft  5112  for providing a damping force between the first end  5112 A and the second end  5112 B. That is, for allowing rotation of the second end  5112 B with respect to the first end  5112 A, the external force exerted on the first rotating shaft  5112  should be large enough to overcome the damping force. That is, the first casing  51  is movable when the external force exerted on the first casing  51  is greater than the damping force. Whereas, when the first casing  51  is exerted by a force that is smaller than the damping force, the first rotating shaft  5112  fails to be rotated and the first casing  51  is maintained unchanged. In this situation, the positioning structure (e.g. the salient and the saw-toothed structure as described in the first embodiment) is no longer necessary. The operations of the second rotating shaft  5512  are similar to those of the first rotating shaft  5112 , and are not redundantly described herein. 
     From the above two embodiments, it is understood that the mouse device with a movable button according to the present invention is feasible to different users of various-sized palms. In the above embodiments, the first casing and the second casing of the mouse device are movable with respect to the body front end of the mouse body, and the first casing and the second casing are separated from the body rear end. Under this circumstance, no matter how the positions of the first casing and the second casing are adjusted, the mouse device can maintain a proper profile to be operated by the user. As a consequence, the comfort of using the mouse device is enhanced. 
     While the invention has been described in terms of what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention needs not be limited to the disclosed embodiment. On the contrary, it is intended to cover various modifications and similar arrangements included within the spirit and scope of the appended claims which are to be accorded with the broadest interpretation so as to encompass all such modifications and similar structures.