Patent Publication Number: US-11051098-B2

Title: Electronic apparatus

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     This application is based on and claims priority under 35 U.S.C. § 119 to Korean Patent Application No. 10-2019-0000516, filed on Jan. 3, 2019 in the Korean Intellectual Property Office, the disclosure of which is incorporated by reference herein in its entirety. 
     BACKGROUND 
     1. Field 
     The disclosure relates to an electronic apparatus, and more particularly, to an electronic apparatus with a loudspeaker. 
     2. Description of Related Art 
     Recently, there has been a lot of changes in design of a loudspeaker with the demands for a slim/bezel-less design of an electronic apparatus including the loudspeaker (e.g., a television (TV), a smartphone, an artificial intelligence (AI) loudspeaker, etc.) and a design of a sound system suitable for a certain space, and changes in a listening style such as casual listening, an ambient mode, etc. Among such changes in the loudspeaker, the most salient change is that a slot is formed in front of a diaphragm in a loudspeaker (i.e. a so-called “slot-type loudspeaker”), thereby not only making the electronic apparatus, such as TV, having a slim structure but also making it possible to dispose the loudspeaker behind a panel of the TV. 
     Referring to  FIG. 32 , as compared with a loudspeaker  3201 , a slot-type loudspeaker  3202  has a peak and a dip in a frequency-response characteristic because resonance and sound tube phenomena occur in the slot, thereby degrading sound quality. As shown in the graph  3210 , the peak and the dip of the slot-type loudspeaker  3202  are significantly different by more than 10 dB from an average sound pressure level of the loudspeaker  3201  in a usable frequency band. In particular, the peak and the dip of the slot-type loudspeaker  3202  extend over several kHz in mid-range and tweeter frequency bands, and therefore it is desirable to solve the problem of degrading the sound quality due to the peak and the dip. 
     SUMMARY 
     According to an embodiment, there is provided an electronic apparatus including a loudspeaker. The loudspeaker may include an enclosure; a first driver disposed in the enclosure and configured to output a sound based on an input audio signal; a unit accommodator having a hole in which the first driver is disposed, and extending toward an inside of the enclosure; a space forming portion extended from an outer edge of the unit accommodator, surrounding a back of the first driver to form a space with the unit accommodator, and spaced apart from an inner edge of the unit accommodator; a slot forming portion extending from the space forming portion, and having an inner surface spaced apart from an outer surface of the unit accommodator to form a first sound output passage; and a sound absorber disposed at at least one of the outer surface of the unit accommodator and the inner surface of the slot forming portion. 
     The first driver may be configured to generate a back wave toward the space forming portion where the back wave may travel through the first sound output passage. 
     The sound absorber may seal the first sound output passage. 
     The sound absorber may include at least one of an uneven portion and a plurality of slits on the outer surface of the unit accommodator along the first sound output passage. 
     The unit accommodator may include at least one of a flat plate shape, a polygonal shape, and a rounded flat plate shape. 
     The unit accommodator may be curved with the first sound output passage. 
     The enclosure may further include a protrusion extending from the inner surface of the space forming portion, and the protrusion may be a flat plate and may have an end portion of the protrusion spaced apart from the inner edge of the unit accommodator. 
     The enclosure may further include a port forming a second sound output passage in an area of the space forming portion behind the first driver. 
     The loudspeaker may include a second driver provided adjacent to the first driver. 
     The loudspeaker may include a second space forming portion surrounding a back of the second driver. 
     The electronic apparatus may further include a second driver, and the unit accommodator may further include: a first unit accommodator provided with the first driver to face toward a first inner surface of a first slot forming portion forming the first sound output passage therebetween; and a second unit accommodator comprising a second inner edge spaced apart from a first inner edge of the first unit accommodator, and provided with the second driver to face toward a second inner surface of a second slot forming portion. The second inner surface of the second slot forming portion may form a third sound output passage in an opposite direction to the first sound output passage. 
     The first driver may be spaced apart at a predetermined distance from the outer edge of the unit accommodator. 
     The electronic apparatus may further include a third driver provided in a second hole of the space forming portion. 
     The electronic apparatus may further include a third space forming portion surrounding the back of the first driver, and a second port through which the third space forming portion is connected to the first sound output passage. 
     The electronic apparatus may further include a display. 
     According to another embodiment, there is provided a loudspeaker including a driver configured to emit sound; a unit accommodator including the driver and a back slot portion adjacent to the driver; a space forming portion connected to an outer edge of the unit accommodator; a slot forming portion connected to the space forming portion. The slot forming portion may be spaced apart from the unit accommodator and an inner surface of the slot forming portion may face a front side of the driver. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other aspects, features, and advantages of certain embodiments of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings, in which: 
         FIG. 1  illustrates an electronic apparatus according to an embodiment; 
         FIG. 2  illustrates a perspective view of a loudspeaker according to an embodiment; 
         FIG. 3  illustrates a perspective view of a loudspeaker without a slot forming portion according to an embodiment; 
         FIG. 4  illustrates a lateral cross-section view of a loudspeaker according to an embodiment; 
         FIG. 5  illustrates a lateral cross-section view of a loudspeaker according to another embodiment; 
         FIG. 6  illustrates a plan cross-section view of a loudspeaker according to another embodiment; 
         FIG. 7  illustrates a lateral cross-section view of a loudspeaker according to still another embodiment; 
         FIG. 8  illustrates a plan cross-section view of a loudspeaker according to still another embodiment; 
         FIG. 9  illustrates a lateral cross-section view of a loudspeaker according to still another embodiment; 
         FIG. 10  shows graphs illustrating effects according to embodiments; 
         FIG. 11  shows graphs illustrating effects according to embodiments; 
         FIG. 12  illustrates a lateral cross-section view of a loudspeaker according to an another embodiment; 
         FIG. 13  illustrates a plan cross-section view of the embodiment shown in  FIG. 12 ; 
         FIG. 14  illustrates a lateral cross-section view of a loudspeaker according to another embodiment; 
         FIG. 15  illustrates a plan cross-section view of the embodiment shown in  FIG. 14 ; 
         FIG. 16  illustrates a lateral cross-section view of a loudspeaker according to still another alternative embodiment; 
         FIG. 17  illustrates a plan cross-section view of the embodiment shown in  FIG. 16 ; 
         FIG. 18  illustrates a perspective view of a unit accommodator in a triangular flat plate shape according to an embodiment; 
         FIG. 19  illustrates a perspective view of a unit accommodator in a rounded flat plate shape according to an embodiment; 
         FIG. 20  illustrates a plan view of the unit accommodator shown in  FIG. 19 ; 
         FIG. 21  illustrates a perspective view of a unit accommodator implemented in the embodiment shown in  FIGS. 14 and 15 ; 
         FIG. 22  illustrates a perspective view of a unit accommodator according to another embodiment; 
         FIG. 23  illustrates a plan view of the embodiment shown in  FIG. 22 ; 
         FIG. 24  shows graphs illustrating effects of variable lengths of a back slot portion of a loudspeaker according to various embodiments; 
         FIG. 25  illustrates a lateral cross-section view of a loudspeaker including a protrusion according to an embodiment; 
         FIG. 26  illustrates a lateral cross-section view of a loudspeaker including another port according to another embodiment; 
         FIG. 27  illustrates a lateral cross-section view of a loudspeaker including a second driver according to another embodiment; 
         FIG. 28  illustrates a plan view of the embodiment shown in  FIG. 27 ; 
         FIG. 29  illustrates a lateral cross-section view of a loudspeaker including a second driver with a second output according to another embodiment; 
         FIG. 30  illustrates a lateral cross-section view of a loudspeaker including a slot portion disposed below a plurality of drivers according to another embodiment; 
         FIG. 31  illustrates a lateral cross-section view of a loudspeaker including a second slot portion channeled to a first slot portion disposed below a plurality of drivers according to another embodiment; and 
         FIG. 32  illustrates embodiments and effects of a related art. 
     
    
    
     DETAILED DESCRIPTION 
     Embodiments will be described in detail with reference to accompanying drawings. In the drawings, like numerals or symbols may refer to like elements having substantially the same function, and the size of each element may be exaggerated for clarity and convenience of description. However, the configurations and functions illustrated in the following embodiments are not construed as limiting the present disclosure and the key configurations and functions. In the following descriptions, details about publicly known functions or features will be omitted when it is determined that they cloud the gist of the present disclosure. 
     In the following embodiments, terms ‘first’, ‘second’, etc. are used to distinguish one element from another, and singular forms may include plural forms unless otherwise stated in the context. In the following embodiments, it may be understood that terms ‘comprise’, ‘include’, ‘have’, etc. do not preclude the presence or addition of one or more other features, numbers, steps, operations, elements, components or combination thereof. In addition, it will be understood in the following embodiments that terms ‘upper’, ‘lower’, ‘left’, ‘right’, ‘inward’, ‘outward’, ‘inside’, ‘outside’, ‘front’, ‘back’, etc. are defined with reference to the accompanying drawings and do not limit the shape or position of the elements. Further, in the following embodiments, at least one among a plurality of elements may refer to not only all of the plurality of elements, but also each element among the plurality of elements excluding the other elements or a combination of the plurality of elements. 
       FIG. 1  illustrates an electronic apparatus  100  according to an embodiment. As shown in  FIG. 1 , the electronic apparatus  100  may be a display apparatus, for example, a television (TV), a smartphone, a notebook computer, a tablet computer, etc. However, the electronic apparatus  100  is not limited to the display apparatus, but may include any apparatus with a loudspeaker to output a sound, for example, an artificial intelligence (AI) loudspeaker, etc. Further, the electronic apparatus  100  may include electronic circuits necessary to provide image and acoustic signals to the display apparatus and one or more loudspeakers, respectively. 
     The electronic apparatus  100  includes a loudspeaker  200 . The loudspeaker provided in the electronic apparatus  100  may include a slot-type loudspeaker. Here, the slot-type loudspeaker may refer to a loudspeaker of which an opening for outputting a sound may be smaller than a diaphragm, without being restricted by the terms. The loudspeaker  200  may be positioned in a lower portion of the electronic apparatus  100  and output a sound in a downward direction from the bottom of the electronic apparatus  100 . However, there are no limits to the position of the loudspeaker  200  provided in the electronic apparatus  100  and the sound output direction of the loudspeaker  200 . 
       FIGS. 2, 3, and 4  illustrate a loudspeaker according to an embodiment.  FIG. 2  is a perspective view of a loudspeaker  200  according to an embodiment,  FIG. 3  is a perspective view of the loudspeaker  200  without a slot forming portion according to an embodiment, and  FIG. 4  is a lateral cross-section view of the loudspeaker  200  according to an embodiment. 
     The loudspeaker  200  may include an enclosure  210  and a driver  220 . 
     The enclosure  210  may refer to a structure forming a shape of the loudspeaker  200 , and may accommodate the driver  220 . There are no specific limits to the shape and material of the enclosure  210 . 
     The driver  220  may output a sound based on an input audio signal. Here, the driver  220  may also be called a unit or a driver unit. The driver  220  may be provided inside the enclosure  210  or along the enclosure  210 . Further, there may be a single or a plurality of drivers  220 . The drivers  220  may be called a first driver, a second driver, etc. to distinguish among the plurality of drivers  220 . The driver  220  may include a diaphragm  221 , a driving circuit, etc., to output a sound based on an input audio signal. 
     The enclosure  210  may include a unit accommodator  211 , a space forming portion  212 , and a slot forming portion  213 . 
     The unit accommodator  211  accommodates the driver unit  220 . The unit accommodator  211  may be a flat plate, but there are no limits to the shape of the unit accommodator  211 . For example, the unit accommodator  211  may be a curved plate. The unit accommodator  211  may extend toward the inside of the enclosure  210 . The unit accommodator  211  may include a hole in which the first driver  220  may be disposed. There are no limits to the position of the first driver  220  in the hole of the unit accommodator  211 . For example, the first driver  220  may be positioned close to an outer edge  211   a  of the unit accommodator  211 . In such case, an area of the unit accommodator  211 , in which the first driver  220  is not accommodated, is biased toward an inner edge  211   b  of the unit accommodator  211 . Alternatively, the first driver  220  may be spaced at a predetermined distance from the outer edge  211   a  of the unit accommodator  211 . Herein, a portion of the unit accommodator  211  between the inner edge  211   b  of the unit accommodator  211  and the first driver  220  will be called a back-slot portion  211   c . Further, a portion of a first sound output passage A, which corresponds to the back-slot portion  211   c , will be called a ‘back-slot’  320 . 
     The space forming portion  212  extends from the outer edge  211   a  of the unit accommodator  211 . For example, the space forming portion  212  and the unit accommodator  211  may be formed as a single body, and the space forming portion  212  may be bent and extend from the outer edge  211   a  of the unit accommodator  211 . Alternatively, the extension of the space forming portion  212  from the unit accommodator  211  may mean that the space forming portion  212  and the unit accommodator  211  are separately provided and coupled to each other at the outer edge  211   a . The space forming portion  212  may form a space together with an inner surface of the unit accommodator  211 , while enclosing the first driver  220 . That is, the back of the first driver  220  may be attached to the inner surface of the unit accommodator  211  and protrude toward the space forming portion  212 . The space formed between the space forming portion  212  and the inner surface of the unit accommodator  211  will be called a chamber  330 . The shape of the space forming portion  212  is not limited to a specific shape. For example, the space forming portion  212  may be a flat plate, a curved plate, etc. 
     The space forming portion  212  may be spaced apart from the inner edge  211   b  of the unit accommodator  211 . Therefore, a space is formed between the space forming portion  212  and the inner edge  211   b  of the unit accommodator  211 . In this space, any sound generated from the driver  220  (e.g., back wave) may travel from the chamber  330  through the back-slot  320 . 
     The slot forming portion  213  may extend from the space forming portion  212 . For example, the slot forming portion  213  and the space forming portion  212  may be formed as a single body, and the slot forming portion  213  may be bent and extend from the end of the space forming portion  212 . Alternatively, the extension of the slot forming portion  213  from the space forming portion  212  may be extended such that the slot forming portion  213  and the space forming portion  212  are separately provided and coupled to each other by the extension. The slot forming portion  213  may be disposed in front of the first driver  220 . Further, the slot forming portion  213  may be spaced apart from and disposed in parallel to the outer surface of the unit accommodator  211 . Therefore, the first sound output passage A, through which a sound is output, may be formed between the slot forming portion  213  and the unit accommodator  211 . A portion of the first sound output passage A, which corresponds to the diaphragm  221  of the driver  220 , will be called a ‘slot’  310 . The shape of the slot forming portion  213  is not limited to a specific shape. For example, the slot forming portion  213  may be a flat plate, a curved plate, etc. 
     In the foregoing structure of a loudspeaker  200 , the back-slot  320  may be disposed between the chamber  330  and the slot  310 , and the sound may travel from the chamber  330  through the back-slot  320  toward the slot  310  as shown in  FIG. 4 . Thus, a sound output from the driver  220  may have an additional sound path of the back-slot  320  and the chamber  330  in addition to the slot  310 , and therefore sound-quality degradation caused by a peak and a dip may be further mitigated than that of the slot-type loudspeaker having only the sound path similar to that of the slot  310 . 
     Further, a sound wave generated in back of the driver  220  (hereinafter, referred to as a ‘back wave’) may pass through the first sound output passage A. Specifically, the back wave generated from the driver  220  may pass through the chamber  330  and the back-slot  320 , and combine with a sound wave output in front of the diaphragm of the driver  220  (hereinafter, referred to as a ‘front wave’) in the slot  310 , so that a higher-quality sound may be output from the loudspeaker  200 . Thus, a sound output from the loudspeaker  200  may be improved in bass-range sound quality. 
       FIGS. 5 to 9  illustrate a loudspeaker  200  according to embodiments.  FIG. 5  is a lateral cross-section view of a loudspeaker according to another embodiment,  FIG. 6  is a plan cross-section view of the loudspeaker according to another embodiment,  FIG. 7  is a lateral cross-section view of a loudspeaker according to still another embodiment,  FIG. 8  is a plan cross-section view of the loudspeaker according to still another embodiment, and  FIG. 9  is a lateral cross-section view of a loudspeaker according to still another embodiment. 
     According to embodiments, the loudspeaker  200  may include a sound absorber  400 , which is not included in the embodiments described in  FIGS. 2 to 4 . The sound absorber  400  is not specially restricted in terms of material, shape, form, composition, configuration, etc. For example, the sound absorber  400  may include a sound absorption material or a sound metamaterial. Alternatively, the sound absorber  400  may be embodied as an object having an uneven portion, a slit, or the like shape. However, when the sound absorber  400  is embodied as an object having an uneven portion, a slit, or the like shape, the sound absorber  400  may serve as a means for controlling a frequency characteristic of a space in which the sound absorber  400  is placed, instead of or in addition to a function of absorbing a sound. 
     A sound wave, which may have a wavelength not longer than twice a total length of the back-slot  320  and the slot  310 , among sound waves generated in the back of the driver  220  may easily pass through the back-slot  320  and the slot  310 , and may be distorted by a standing wave generated inside the back-slot  320  and the slot  310 . On the other hand, according to an embodiment with the sound absorber  400 , such distortion of sound quality due to the standing wave may be reduced, and thus the quality of sound output from the loudspeaker  200  may be improved. 
     The sound absorber  400  may be provided in at least one of the outer surface of the unit accommodator  211  or the inner surface of the slot forming portion  213 . When the sound absorber  400  may be provided in at least one of the outer surface of the unit accommodator  211  or the inner surface of the slot forming portion  213 , there are no specific limits to the position and shape of the sound absorber  400 . For example, as shown in  FIGS. 5 and 6 , the sound absorber  400  may be provided as two sound absorbers  401  and  402  having the same length as the back-slot  320  and respectively contacting the opposite sides of the first sound output passage A. Alternatively, as shown in  FIGS. 7 and 8 , a sound absorber  403  may be provided to seal up the first sound output passage A. In the latter case, the first sound output passage A is sealed up with the sound absorber  403  as compared with the former case where the sound absorbers  401  and  402  do not seal up the first sound output passage A, thereby further reducing the distortion of the sound quality due to the standing wave. Here, ‘sealing up’ the sound output passage with the sound absorber  403  may mean that the sound output passage is blocked by the shape of the sound absorber  403 . Therefore, for example, when the sound absorber  403  itself is permeable, air can pass through the sound output passage via the sound absorber  403  even though the sound output passage is sealed up with the sound absorber  403 . That is, flow of air is not completely prevented in the sound output passage even though the sound output passage is sealed up with the sound absorber  403 . 
     Further, as shown in  FIG. 9 , the loudspeaker  200  may additionally include a port  500  in a certain area of the space forming portion  212 , to form a second sound output passage B. The port  500  allows the back wave sound in the chamber to be emitted toward the outside through the second sound output passage B in addition to the first sound output passage A. However, there are no limits to the position or orientation of the port  500 . For example, as shown in  FIG. 26 , the port  500  may be provided in a certain area behind the first driver  220  of the space forming portion  212 , unlike that of  FIG. 9 , and oriented in an opposite direction to that of  FIG. 9 , thereby forming the second sound output passage B in the opposite direction to that of  FIG. 9 . 
     The bass-range sound quality of the sound output from the loudspeaker  200  is generally improved by the port  500 , and thus the back-slot  320  may contribute to reducing the distortion of the sound due to the slot-type loudspeaker structure and the port  500  improving the bass-range sound quality, thereby improving the overall sound quality. 
       FIGS. 10 and 11  show graphs illustrating effects according to embodiments. 
       FIG. 10  is a graph  1010  showing a response characteristic in a frequency domain and a graph  1020  showing a response characteristic in a time domain for comparison between a conventional slot-type loudspeaker and a loudspeaker according to an embodiment of the disclosure. It may be appreciated that a loudspeaker  1002  according to an embodiment may improve sound quality with respect to the response characteristics in the frequency and time domains as compared with those of a conventional slot-type loudspeaker  1001  having no additional sound path of the back-slot  320  and the chamber  330 . 
     In particular, a peak/dip decreasing rate in the embodiment with the sound absorber  400  may be less than that of a loudspeaker with no sound absorber, and this is illustrated in  FIG. 11 .  FIG. 11  is a graph  1110  showing a comparison in an output sound between a loudspeaker  1101  without a sound absorber, and loudspeakers  1102  and  1103  with the sound absorber  400 . In the graph  1110 , it may be seen that the peak/dip of the loudspeakers  1102  and  1103  vary less than that of the loudspeaker  1101 . Thus, it may be appreciated that a peak/dip decreasing rate in the loudspeakers  1102  and  1103  with the sound absorber  400  is less than that of the loudspeaker  1101  without a sound absorber. 
       FIGS. 12 to 31  illustrate various embodiments. 
     The sound absorber  400  according to an embodiment may be provided on the outer surface of the unit accommodator  211  to form at least one of an uneven portion or a slit along the first sound output passage A. In this regard, description will be made with reference to  FIGS. 12 to 17 . 
       FIGS. 12 and 13  illustrate an embodiment in which an uneven portion  1200  is formed on the outer surface of the unit accommodator  211  along the first sound output passage A ( FIG. 12  is a lateral cross-section view, and  FIG. 13  is a plan cross-section view).  FIGS. 12 and 13  illustrate an embodiment that the uneven portions  1200  are repetitively formed at regular intervals, but the disclosure is not limited hereto. Alternatively, the uneven portion may be formed at irregular intervals or without repetition. 
       FIGS. 14 and 15  illustrate an embodiment in which slits  1400  are formed on the outer surface of the unit accommodator  211  along the first sound output passage A ( FIG. 14  is a lateral cross-section view, and  FIG. 15  is a plan cross-section view).  FIGS. 14 and 15  illustrate an embodiment that the slits  1400  are formed at regular intervals, but the disclosure is not limited to this embodiment. Further, FIGS.  14  and  15  illustrate that the slits are formed along the first sound output passage A, in a direction perpendicular to the longitudinal direction of the first sound output passage A. However, there are no limits to the position and direction of the slits  1400 . For example, the slits formed on the outer surface of the unit accommodator  211  may have the shape as shown in  FIG. 21 . 
       FIGS. 16 and 17  illustrate an embodiment in which a predetermined pattern  1700  is formed on the outer surface of the unit accommodator  211  along the first sound output passage A ( FIG. 16  is a lateral cross-section view, and  FIG. 17  is a plan cross-section view).  FIGS. 16 and 17  illustrate an embodiment in which the patterns  1700  are repetitively formed having a straight or bent shape, but the disclosure is not limited to this embodiment. Alternatively, a predetermined pattern may be formed having a curved shape or without repetition. 
     Although  FIGS. 12 to 17  illustrate the embodiments in which uneven portions, slits or patterns are formed on the outer surface of the unit accommodator  211 , the disclosure is not limited to these embodiments. Alternatively, the uneven portions, slits or patterns may be formed on any place in contact with or near the first sound output passage A. For example, the uneven portion, slits, patterns, etc. may be formed on the inner surface of the slot forming portion  213 . 
     Thus, as compared with the loudspeaker in which the outer surface of the unit accommodator  211 , the inner surface of the slot forming portion  213 , etc. are flat without the uneven portions, the slits, the patterns, etc., the loudspeaker  200  may be configured in various forms to generate various sound modes in the back-slot portion  211   c , thereby further reducing a distortion of sound quality. That is, when the sound absorber  400  is embodied as an object shaped to have the uneven portions, the slit, various patterns, etc., the sound absorber  400  may serve as a means for controlling a frequency characteristic of a space in which the sound absorber  400  is placed, instead of or in addition to a function of merely absorbing a sound. 
     The unit accommodator  211  may be shaped like a polygonal or rounded flat plate. In this regard, descriptions will be made with reference to  FIGS. 18 to 21 . 
       FIG. 18  illustrates an embodiment in which a portion  1800  of the unit accommodator  211  is shaped like a triangular flat plate. However, the disclosure is not limited hereto. Alternatively, for example, the unit accommodator  211  itself may be a triangular flat plate, or may be formed as a triangular flat plate aligned in a different direction from that of  FIG. 18 , or may be embodied as a flat plate having other polygonal shapes other than the triangular shape. 
       FIGS. 19 and 20  illustrate an embodiment in which the unit accommodator  211  has a rounded flat plate ( FIG. 19  is a perspective view without the slot forming portion  213 , and  FIG. 20  is a plan view). Further,  FIGS. 19 and 20  illustrate an embodiment in which the unit accommodator  211  includes not a single flat plate but three partitioned flat plates. However, the disclosure is not limited to this embodiment. For example, the unit accommodator  211  may include a different rounded plate from that of  FIGS. 19 and 20 , partitioned into another number of flat plates, or include unpartitioned flat plates. 
     Thus, various sound modes may be rendered in the back-slot portion  211   c , thereby further reducing a distortion of sound quality. 
     According to an embodiment, the unit accommodator  211  may be provided with a curved first sound output passage A. In this regard, descriptions will be made with reference to  FIGS. 22 and 23 . 
       FIGS. 22 and 23  illustrate an embodiment in which the first sound output passage A may be curved toward the driver  220 . Further,  FIGS. 22 and 23  illustrate an embodiment that the first sound output passage A decreases in width toward the driver  220 , thereby gradually decreasing the cross-sectional area of the first sound output passage A. However, the disclosure is not limited to this embodiment. Alternatively, the curved direction of the first sound output passage A may be different from that of  FIGS. 22 and 23 . Further, variation in the cross-sectional area of the first sound output passage A may be rendered, different from that of  FIGS. 22 and 23 . 
     Thus, various sound modes may be rendered in the back-slot portion  211   c , thereby further reducing a distortion of sound quality. 
     According to an embodiment, the length of the back-slot portion  211   c  may vary. In this regard, descriptions will be made with reference to  FIG. 24 .  FIG. 24  illustrates a loudspeaker  2401  in which the back-slot portion  211   c  is not present, a loudspeaker  2402  in which the back-slot portion  211   c  is relatively short, a loudspeaker  2403  in which the back-slot portion  211   c  is relatively long. A graph  2410  shows a comparison in frequency-response characteristic of an output sound among the loudspeakers  2401 ,  2402 , and  2403 . Referring to  FIG. 24 , it may be understood that a degree of reducing a peak/dip and general characteristics of the output sound may vary depending on the presence of the back-slot portion  211   c  and the length of the back-slot portion  211   c . Therefore, the loudspeaker  200  may be designed by properly changing the length of the back-slot portion  211   c  according to desired sound quality. 
     Referring to  FIG. 25 , the enclosure  210  may include a protrusion  214  in a plate shape extending from the inner surface of the space forming portion  212 , and having an end portion spaced apart from the inner edge  211   b  of the unit accommodator. In comparison with the foregoing loudspeaker described with reference to  FIG. 4 , the loudspeaker of  FIG. 25  may include the protrusion  214  partially blocking a passage connecting the back-slot  320  and the chamber  330 . 
     Accordingly, various sound modes may be rendered in the back-slot portion  211   c  or around the back-slot portion  211   c , thereby further reducing a distortion of sound quality. 
     Referring to  FIG. 26 , the enclosure  210  may further include the port  500  forming the second sound output passage B, through which the back wave sound in the chamber is emitted toward the outside. The port  500  may be disposed in a region behind the first driver  220  of the space forming portion  212 . However, as described with reference to  FIG. 9 , there are no limits to the position and direction of the port  500 . 
     Thus, a sound output from the loudspeaker  200  may be improved in bass-range sound quality. 
     In addition, the unit accommodator  211  according to an embodiment may include a second driver  230  provided adjacent to the first driver  220  toward the outer edge of the unit accommodator  211 , which is illustrated in  FIG. 27 . The drivers  220  and  230  may receive audio signals of different ranges. Accordingly, the loudspeaker  200  may further include a network circuit to respectively distribute the audio signals to the drivers  220  and  230 . 
     Thus, signals of different ranges are respectively provided to the drivers to provide a sound of improved sound quality. 
     Furthermore, the unit accommodator  211  may further include a second space forming portion  231  surrounding the back of the second driver  230 . When the second space forming portion  231  is not present, the second driver  230  and the first driver  220  may share one chamber  330  with each other. On the other hand, when the second space forming portion  231  surrounding the back of the second driver  230  is present, the first driver  220  may have the first chamber  330  and the second driver  230  may have a second chamber  331 . That is, the second driver  230  may have a separate chamber  331  independently of the first driver  220 . In the latter case, a sound wave generated in back of the second driver  230 , i.e., a second back wave, does not radiate to the outside of the loudspeaker  200 , and therefore a sound output from the second driver  230  is not reinforced with respect to a bass-range sound. 
     Thus, when the sound output from the second driver  230  is not reinforced with respect to the bass-range sound, the loudspeaker  200  may provide a sound with proper sound quality and characteristic suitable for various circumstances. 
     Meanwhile, the foregoing embodiments may not be applied independently of each other, but applied as a plurality of embodiments. For example, as shown in  FIG. 28 , the loudspeaker  200  may include a plurality of drivers  220  and  230 , and the unit accommodator  211  may be formed in a rounded shape to make a curved first sound output passage A. Further, the loudspeaker  200  of this embodiment may further include the sound absorber  400 . 
     Thus, it is possible to provide a sound of improved sound quality. 
     When the loudspeaker  200  includes a plurality of drivers, the drivers may be provided to output sounds through different sound output passages, respectively. In this regard, detailed descriptions about the configuration according to this embodiment will be described with reference to  FIG. 29 . 
     As described above, the loudspeaker  200  may further include the second driver  230 . The unit accommodator  211  may include a first unit accommodator  211   d  provided with the first driver  220  and facing toward a first inner surface  213   a  of the slot forming portion  213 , and a second unit accommodator  211   e  having an inner edge spaced apart from the inner edge of the first unit accommodator  211   d  and provided with the second driver  230  facing toward a second inner surface  213   b  of the slot forming portion  213 . The second inner surface  213   b  of the slot forming portion  213  may form a third sound output passage C in an opposite direction to the first sound output passage A. In this case, it is possible to reduce a distortion of sound quality due to interference between the drivers, as compared with that of the embodiment shown in  FIG. 27  where the first driver  220  and the second driver  230  are provided side by side to respectively output the sounds through one output passage. 
     In other words, the sounds respectively output from the drivers may be output through different sound output passages, thereby not only separating output sound ranges according to the drivers, but also reducing a distortion of sound quality due to interference between the drivers. 
     Further, the loudspeaker according to this embodiment may further include a barrier wall  216  connecting the inner edge of the first unit accommodator  211   d  and the first inner surface of the slot forming portion  213  and blocking the inside of the first sound output passage A. With the barrier wall  216 , the first sound output passage A and the third sound output passage C are more clearly partitioned from each other. Further, the back waves, the sound waves generated behind the drivers  220  and  230 , may radiate toward only the third sound output passage C. 
     Thus, a distortion of sound quality due to interference between the drivers may be further reduced. 
     Referring to  FIG. 30 , the space forming portion  212  may further include a hole in which a third driver  240  is provided and the third driver may output a sound toward the outside of the space forming portion  212 . On the contrary to the foregoing drawings,  FIG. 30  illustrates the loudspeaker turned upside down. That is, contrary to the foregoing drawings where the slot forming portion  213  is disposed above the space forming portion  212  and thus the first sound output passage A is also provided above the first driver  220 ,  FIG. 30  illustrates that the slot forming portion  213  is disposed below the space forming portion  212  and the first sound output passage A is also provided below the first driver  220 . In this embodiment, the operations and effects of the first driver  220  are similar to those of the foregoing embodiments, but the first sound output passage A serves as the port  500  for the third driver  240 . Further, the slot forming portion  213  may be bent along the first sound output passage A to form a space D underneath the slot forming portion  213 . In this case, both sounds output from the first driver  220  and the third driver  240  have an additional sound path. 
     Thus, it is possible to not only divide and reproduce output sound ranges according to the drivers, but also reinforce a bass sound output from the third driver  240 . 
     Further, referring to  FIG. 31 , as another alternative embodiment, the unit accommodator  211  may further include a third space forming portion  217  surrounding the back of the first driver  220 , and a second port  501  through which the back waves generated by the first driver  220  and the third driver  240  travel through the second port  501  and to the first sound output passage A. In this case, the first driver  220  and the third driver  240  respectively have chambers divided from each other, thereby decreasing interference therebetween and reinforcing a bass range with respect to the sound output from the first driver  220 . 
     Thus, it is possible to provide a higher sound quality and characteristic suitable for circumferences. 
     As described above, the electronic apparatus may provide improved sound quality. 
     According to one or more embodiments described herein, it is possible to provide an electronic apparatus with a loudspeaker with improved sound quality. 
     Although a few embodiments have been shown and described, it may be appreciated by those skilled in the art that changes and modifications may be made in these embodiments without departing from the principles and spirit of the present disclosure, the scope of which is defined in the appended claims and their equivalents.