Abstract:
A speaker module is disposed on the top casing and includes at least one first vent. A printed circuit board is disposed between the top casing and the bottom casing and includes at least one second vent corresponding to the first vent.

Description:
BACKGROUND 
     The invention relates to an electronic device with audio capability, and in particular to a notebook computer with improved audio output. 
     Conventionally, a notebook computer provides speakers to output sound. The speakers are often disposed in a host of the notebook computer. Specifically, the host of the notebook computer comprises a top casing and a bottom casing. The speakers are disposed on the top casing, and a printed circuit board (or a main board) is disposed between the top casing and the bottom casing. As bottom ends of the speakers are often separated from the printed circuit board by a small distance, the space of a sound box between each speaker and the printed circuit board is small or air elasticity therebetween poor. Accordingly, when the speakers operate, a diaphragm in each speaker is not easily vibrated due to the insufficient space of the sound box or air elasticity. Namely, resonance is not easily generated between the diaphragm in each speaker and air. Sound magnitude from the speakers and audio quality provided thereby are thus adversely affected. 
     To increase volume from the speakers, portions, under and corresponding to the speakers, of the printed circuit board are removed. Accordingly, the space of the sound box or air elasticity under the speakers is increased, increasing the volume from the speakers. 
     Nevertheless, in the limited space provided by the host of the notebook computer, arrangement of the printed circuit board and electronic members is difficult. Layout of circuits on the printed circuit board is further complicated when portions thereof are removed. 
     Hence, there is a need for a notebook computer with improved audio output or an electronic device with audio capability. Volume from a speaker module of the notebook computer or electronic device is increased when layout of circuits on a printed circuit board thereof is less influenced. 
     SUMMARY 
     Accordingly, an exemplary embodiment of the invention provides a notebook computer with improved audio output. The notebook computer comprises a monitor, a host, a speaker module, and a printed circuit board. The host pivots the monitor and comprises a top casing and a bottom casing opposite thereto. The speaker module is disposed on the top casing and comprises at least one first vent. The printed circuit board is disposed between the top casing and the bottom casing and comprises at least one second vent corresponding to the first vent. 
     The projected size of the first vent on the printed circuit board is substantially equal to the size of the second vent. 
     The projected size of the first vent on the printed circuit board is less than the size of the second vent. 
     The projected profile of the first vent on the printed circuit board is substantially equal to the profile of the second vent. 
     The speaker module further comprises a speaker body opposing the printed circuit board. 
     The notebook computer further comprises a sound box body disposed between the second vent and the bottom casing. 
    
    
     
       DESCRIPTION OF THE DRAWINGS 
       The invention can be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein: 
         FIG. 1  is a schematic perspective view of a notebook computer with improved audio output; 
         FIG. 2  is a partial cross section taken along line A-A of  FIG. 1 ; 
         FIG. 3  is a schematic bottom view of a speaker module of the notebook computer with improved audio output; and 
         FIG. 4  is a schematic bottom view of a printed circuit board of the notebook computer with improved audio output. 
     
    
    
     DETAILED DESCRIPTION 
     Referring to  FIG. 1  and  FIG. 2 , an embodiment of an electronic device with audio capability may be a notebook computer  100  with improved audio output. The notebook computer  100  comprises a monitor  110 , a host  120 , two speaker modules  130 , and a printed circuit board (or main board)  140 . 
     The host  120  pivots the monitor  110  and comprises a top casing  121  and a bottom casing  122  opposite thereto. The speaker modules  130  are disposed on the top casing  121  of the host  120 . As shown in  FIG. 2  and  FIG. 3 , each speaker module  130  comprises a speaker body  131  and two first vents  132 . The speaker body  131  opposes the printed circuit board  140 . As shown in  FIG. 2  and  FIG. 4 , the printed circuit board  140  is disposed between the top casing  121  and the bottom casing  122  of the host  120  and comprises two second vents  141  formed thereon and corresponding to each speaker module  130 . Specifically, the second vents  141  of the printed circuit board  140  oppose the first vents  132  of the speaker module  130 , and the projected size of each first vent  132  on the printed circuit board  140  is substantially equal to the size of each second vent  141 . The profiles of the first vents  132  and second vents  141  can be determined according to the configuration of the speaker module  130 , and the projected profile of the first vents  132  on the printed circuit board  140  substantially equal to the profile of the second vents  141 . In this embodiment, the profiles of the first vents  132  and second vents  141  are substantially rectangular. 
     Accordingly, even though a bottom end of the speaker module  130  (or speaker body  131 ) is separated from the printed circuit board  140  by a small distance, flow of air is enhanced by the second vent  141  on the printed circuit board  140 . Namely, air elasticity between the speaker module  130  and the printed circuit board  140  is enhanced. Additionally, by the second vents  141  on the printed circuit board  140 , a sound box under the speaker module  130  is extended to the bottom casing  122  of the host  120 . Accordingly, when the speaker module  130  operates, a diaphragm (not shown) in the speaker body  131  is easily vibrated because of the increased space of the sound box or air elasticity. Namely, resonance is easily generated between the diaphragm in the speaker body  131  and air, increasing volume from the speaker module  130  and promoting audio quality provided thereby. 
     Moreover, as shown in  FIG. 2 , a sound box body  150  can be, if possible, disposed between the second vent  141  of the printed circuit board  140  and the bottom casing  122  of the host  120 . Accordingly, resonance is also easily generated between the diaphragm in the speaker body  131  and the air, further promoting the audio quality provided by the speaker module  130 . 
     The disclosed electronic device with audio capability is not limited to a notebook computer, and may be a PDA or MP3 having only a host. The structure of the host of the PDA or MP3 can be the same as that of the host  120  of the notebook computer  100 . 
     In conclusion, volume from the speaker module  130  of the notebook computer  100  with improved audio output or electronic device with audio capability is increased when layout of circuits on the printed circuit board  140  thereof is less influenced. 
     While the invention has been described by way of examples and in terms of preferred embodiment, it is to be understood that the invention is not limited thereto. To the contrary, it is intended to cover various modifications and similar arrangements (as would be apparent to those skilled in the art). Therefore, the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements.