Patent Publication Number: US-9888321-B2

Title: Loudspeaker, electronic apparatus using same, and mobile apparatus

Description:
BACKGROUND 
     1. Technical Field 
     The present disclosure relates to a loudspeaker having an illuminating function, and an electronic apparatus and a mobile apparatus using same. 
     2. Background Art 
     A conventional loudspeaker is described below. The conventional loudspeaker includes a loudspeaker unit and an illumination part. The illumination part has a ring shape and includes a light-emitting element. The illumination part is attached to a front face of the loudspeaker unit. The illumination part is formed of transparent resin to guide light emitted from the light-emitting element. 
     Known patent literatures related to the present disclosure include Unexamined Japanese Patent Publication No. 119-212107. 
     SUMMARY 
     A loudspeaker of the present disclosure includes a frame, a magnetic circuit provided with a magnetic gap, a cone-shaped diaphragm, a voice coil, and an LED. The magnetic circuit is connected to a lower part of the frame. The diaphragm has a front face and a rear face. The rear face of the diaphragm is connected to an outer periphery of the frame. The voice coil has a first end and a second end. The first end of the voice coil is connected to the diaphragm. The second end of the voice coil is inserted into the magnetic gap. The LED outputs light toward the center of the diaphragm, and is provided on an upper part of the frame such that the light is reflected on the front face of the diaphragm. 
     With the above structure, light output from the LED is reflected at multiple points on the front surface of the diaphragm. Accordingly, a complicated light pattern appears on the diaphragm. Furthermore, since the diaphragm has a cone shape, the pattern looks three-dimensional by mutual interference of lights reflected on the surface of the diaphragm. As a result, the loudspeaker of the present disclosure can be decorated with illumination of an extremely complicated light pattern, and furthermore an image with three-dimensional appearance. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a sectional view of a loudspeaker in accordance with an exemplary embodiment of the present disclosure. 
         FIG. 2  is a front view of the loudspeaker in accordance with the exemplary embodiment of the present disclosure. 
         FIG. 3  is a schematic diagram of a light pattern that appears on the loudspeaker in a light-emitting state in accordance with the exemplary embodiment of the present disclosure. 
         FIG. 4  is a photo observation view of the loudspeaker in the light-emitting state taken from the front in accordance with the exemplary embodiment of the present disclosure. 
         FIG. 5  is a magnified sectional view of a key part of the diaphragm in accordance with the exemplary embodiment of the present disclosure. 
         FIG. 6  is a magnified sectional view of a key part of the diaphragm including a reflective material in accordance with the exemplary embodiment of the present disclosure. 
         FIG. 7  is a magnified sectional view of a key part of the diaphragm in which convex parts are formed on its surface in accordance with the exemplary embodiment of the present disclosure. 
         FIG. 8  is a magnified sectional view of a key part of the diaphragm in which the convex parts are disposed away from each other in accordance with the exemplary embodiment of the present disclosure. 
         FIG. 9  is a magnified sectional view of a key part of the diaphragm in which the convex parts have linear shapes in accordance with the exemplary embodiment of the present disclosure. 
         FIG. 10  is a magnified sectional view of a key part of the diaphragm in which concave parts are formed on a front face in accordance with the exemplary embodiment of the present disclosure. 
         FIG. 11  is a front view of the diaphragm on which a spiral convex part is formed in accordance with the exemplary embodiment of the present disclosure. 
         FIG. 12  is a front view of the diaphragm on which concentric convex parts are formed in accordance with the exemplary embodiment of the present disclosure. 
         FIG. 13  is a conceptual diagram illustrating reflection of light on the diaphragm in accordance with the exemplary embodiment of the present disclosure. 
         FIG. 14  is a conceptual diagram of the loudspeaker seen from the front face in the light-emitting state in accordance with the exemplary embodiment of the present disclosure. 
         FIG. 15  is a conceptual diagram illustrating reflection of light on the diaphragm in accordance with the exemplary embodiment of the present disclosure. 
         FIG. 16  is a conceptual diagram of an electronic apparatus in accordance with the exemplary embodiment of the present disclosure. 
         FIG. 17  is a conceptual diagram of a mobile apparatus in accordance with the exemplary embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
     Prior to describing loudspeaker  11  in accordance with the exemplary embodiment, a disadvantage of a conventional loudspeaker is described. 
     In the conventional loudspeaker, just an illumination part shines. Accordingly, a light pattern that appears on the loudspeaker is simple. An object of the loudspeaker in accordance with the exemplary embodiment is to decorate the loudspeaker with illumination of a complicated light pattern and image. 
     The loudspeaker in accordance with the exemplary embodiment is described below with reference to drawings.  FIG. 1  is a sectional view of loudspeaker  11 .  FIG. 2  is a front view of loudspeaker  11 .  FIG. 1  shows the view taken along line  1 - 1  in  FIG. 2 . 
     Loudspeaker  11  includes frame  12 , magnetic circuit  13  provided with magnetic gap  13 A, cone-shaped diaphragm  14 , voice coil  15 , and light-emitting diode  16  (hereinafter referred to as “LED  16 ”). Frame  12  includes an upper part and a lower part opposite to the upper part. Diaphragm  14  includes a front face and a rear face opposite to the front face. Loudspeaker  11  further preferably includes dust cap  17 . 
     Magnetic circuit  13  is connected to the center of the lower part of frame  12 . Diaphragm  14  is connected to an outer periphery of frame  12 . Voice coil  15  includes a first end and a second end. The second end is formed on the opposite side of the first end. The first end of voice coil  15  is connected to diaphragm  14 . Specifically, the first end of voice coil  15  is connected to the rear face of diaphragm  14 . The first end of voice coil  15  may alternatively be connected to the side face of an inner periphery or the front face of diaphragm  14 , besides the configuration of connecting the first end to the rear face of diaphragm  14 . On the other hand, the second end of voice coil  15  is inserted into magnetic gap  13 A. 
     LED  16  is disposed on the upper part of frame  12 , and faces the center of diaphragm  14 . With this configuration, LED  16  outputs light toward the center of diaphragm  14 . In this case, LED  16  is disposed such that light output from LED  16  is reflected on the front face of diaphragm  14 . 
       FIG. 3  is a schematic diagram of a light pattern that appears on loudspeaker  11  in the light-emitting state.  FIG. 4  is a photo observation view of loudspeaker  11  in the light-emitting state taken from the front face. 
     A general small light bulb diffuses and outputs light in all directions from the light bulb. Accordingly, if a small light bulb is used as a light source instead of LED  16 , it just makes the entire front face of diaphragm  14  bright. On the other hand, LED  16  can output light with higher linearity than general small light bulbs. Accordingly, linear pattern  31  can be formed on diaphragm  14  by the light output from LED  16 . 
     With the above configuration, the light output from LED  16  is reflected at multiple points on the front surface of diaphragm  14 . Accordingly, complicated light pattern  31  formed of multiple straight portions appears on diaphragm  14 . Still more, cone-shaped diaphragm  14  makes pattern  31  look like a three-dimensional light image by mutual interference of lights reflected on the surface of diaphragm  14 . As a result, loudspeaker  11  can be decorated with illumination of extremely-complicated light pattern  31 , and furthermore an image with three-dimensional appearance. 
     Next, loudspeaker  11  is described in detail. The shape of diaphragm  14  when seen from the front face is preferably round (a circle). In case of round diaphragm  14 , an outer shape of loudspeaker  11  is also preferably round. Meanwhile, the shape of diaphragm  14  seen from the front face is not limited to round. For example, an oval, rectangular, or track type diaphragm is also acceptable. 
     As shown in  FIG. 1 , LED fixing part  18  is provided on the upper part of frame  12 . LED fixing part  18  has an annular shape. With this configuration, LED fixing part  18  can also serve as a gasket. LED  16  is placed on the inner periphery of LED fixing part  18 . In a case where diaphragm  14  is round seen from the front face, LED fixing part  18  preferably has an annular shape. 
     Frame  12  may include LED fixing part  18 . In this case, LED fixing part  18  is preferably molded integrally with frame  12 . This configuration eliminates the need of assembling LED fixing part  18  and frame  12  separately. Accordingly, an assembly man-hour of loudspeaker  11  can be reduced. 
     Shielding  18 A and LED fixing part  18  are integrally formed. However, the configuration is not limited. Shielding  18 A and LED fixing part  18  may also be formed separately. 
     LED  16  is placed such that an optical axis of LED  16  crosses central axis  15 A of voice coil  15  shown in  FIG. 1  at right angles. Alternatively, LED  16  may also be placed on a tilt such that its tip faces toward the front face of diaphragm  14 . The shape and brightness of pattern  31  shown in  FIG. 3  can be adjusted by adjusting an angle between the optical axis of LED  16  and central axis  15 A. 
     As shown in  FIG. 3 , multiple LEDs  16  are provided on LED fixing part  18 . This configuration enables to form complicated pattern  31  using multiple light rays on diaphragm  14 . In this case, LEDs  16  are preferably disposed away from each other. This configuration enables to suppress shining of entire diaphragm  14 . In other words, a bright area and dark area can be formed on diaphragm  14 . Accordingly, light pattern  31  and image formed on diaphragm  14  look sharper and brighter. 
     Multiple LEDs  16  are preferably disposed away from each other at equal intervals. This configuration enables to form beautiful geometric pattern  31  on diaphragm  14 . In this case, the shape of diaphragm  14  seen from the front face is preferably round. This configuration enables to form rotationally-symmetric pattern  31  with respect to the center of diaphragm  14 . 
     As shown in  FIG. 1 , LED fixing part  18  may include shielding  18 A. LEDs  16  are disposed between shielding  18 A and diaphragm  14 . Shielding  18 A blocks light output toward the opposite side of diaphragm  14  in lights output from LEDs  16 . This configuration enables to suppress the direct incidence of lights emitted from LEDs  16  into eyes when diaphragm  14  is seen from the front face. Accordingly, light pattern  31  and image look sharper and brighter. Shielding  18 A can also serve as a gasket. 
     Shielding  18 A is preferably integrally molded with LED fixing part  18 . This configuration enables to reduce an assembly man-hour of LED fixing part  18 . However, the structure of shielding  18 A and LED fixing part  18  is not limited to integral molding. Shielding  18 A and LED fixing part  18  may be formed separately. 
     LED fixing part  18  preferably has a color darker than that of the front face of diaphragm  14 . In other words, LED fixing part  18  preferably has a color with a reflectivity lower than that of the front face of diaphragm  14 . The most preferable color for LED fixing part  18  is black. Still more, the surface of LED fixing part  18  preferably has unevenness. For example, the surface of LED fixing part  18  is embossed. This configuration can make the surface of LED fixing part  18  less glossy. Accordingly, LED fixing part  18  can suppress reflection of light output from LEDs  16 . As a result, light pattern  31  and image shown in  FIG. 3  look sharper and brighter. 
     Dust cap  17  is provided at the center of diaphragm  14 . Dust cap  17  is preferably protruded from diaphragm  14  toward magnetic circuit  13 . Dust cap  17  having this configuration does not block light emitted from LED  16 . Accordingly, pattern  31  shown in  FIG. 3  can be formed on a bonded part of diaphragm  14  and dust cap  17  and also on dust cap  17 . The rear face of dust cap  17  is disposed facing the front face of diaphragm  14 . 
     A cross-sectional shape of dust cap  17  when cut along the axis of voice coil  15  is preferably curved. In particular, dust cap  17  is preferably arc-shaped in cross section. This configuration enables to clearly form light pattern  31  shown in  FIG. 3  also on the front face of dust cap  17 . Still more, assembly  19  formed of diaphragm  14  and dust cap  17  has a cone shape. The surface of assembly  19  thus serves as a concave mirror. As a result, an image formed by lights output from LEDs  16  looks three-dimensional. In other words, a light image looks as if it is protruding and positioned closer than the front face of diaphragm  14 , or farther than the front face. 
     Next, diaphragm  14  is described in detail. In general, a diaphragm made of paper has pin holes and uneven surface due to fibers. The front face of paper diaphragm thus diffusely reflects light. Accordingly, the paper diaphragm becomes just bright as a whole. In other words, it is difficult to form a clear pattern or image on diaphragm  14  if diaphragm  14  is made of paper. Therefore, diaphragm  14  is made of resin and preferably made by resin molding. The surface of diaphragm  14  made by resin molding is smoother than that of the diaphragm made of paper. Accordingly, diffused reflection of lights output from LEDs  16  on the front face of diaphragm  14  can be suppressed. As a result, pattern  31  and image shown in  FIG. 3  look sharp and bright. 
     The front face of diaphragm  14  preferably has a color brighter than that of the rear face. In other words, the front face of diaphragm  14  preferably has a reflectivity higher than that of the rear face. This configuration achieves a high light reflectivity on the front face of diaphragm  14 . Accordingly, light pattern  31  and image shown in  FIG. 3  look sharper and brighter. In particular, the color of the front face of diaphragm  14  is preferably silver. In this case, a color to be output from LED  16  can be selected from a broad range. For example, LED  16  may emit white, green, blue, or red light. The color of the front face of diaphragm  14  may also be white. In this case, the color of LED  16  is preferably other than white. 
       FIG. 5  is a magnified sectional view of a key part of diaphragm  14 . Diaphragm  14  preferably includes base layer  14 A and reflective material layer  14 B. Reflective material layer  14 B is formed on the front face of diaphragm  14 . Reflective material layer  14 B preferably has a color brighter than that of base layer  14 A. In other words, the front face of diaphragm  14  has a higher reflectivity than that of the rear face. This configuration improves reflectivity of light output from LED  16  on the front face of diaphragm  14 . Reflective material layer  14 B can be formed by attaching, painting, depositing, or plating a reflective material on base layer  14 A. 
     Reflective material layer  14 B is preferably metal. This configuration can form reflective material layer  14 B with a high light reflectivity on the front face of diaphragm  14 . Since hardness of metal reflective layer  14 B is high, elastic modulus of diaphragm  14  can be increased. Accordingly, the sound pressure of diaphragm  14  can be increased. Metal reflective material layer  14 B may be formed by deposition. However, reflective material layer  14 B is not limited to metal. It may also be fluorescent paint. In this case, fluorescent paint is applied to the front face of diaphragm  14 . 
     Reflective material layer  14 B is also preferably formed on the front face of dust cap  17 . This configuration makes a light image further brighter. 
       FIG. 6  is a sectional view of a key part of diaphragm  14  including a reflective material. Diaphragm  14  may include sub-material  14 D in main material  14 C. Main material  14 C is resin. Main material  14 C is, for example, polypropylene. This configuration achieves lightweight diaphragm  14 . Sub-material  14 D is a reflective material. In this case, the reflectivity of sub-material  14 D is preferably higher than that of main material  14 C. Sub-material  14 D is also preferably resin. Still more, a powder fluorescent substance may be used for sub-material  14 D. 
       FIG. 7  is a magnified sectional view of a key part of diaphragm  14  in which convex parts  21  are formed on its front face. The front face of diaphragm  14  preferably includes convex parts  21 . This configuration makes the reflecting direction of light different, depending on the exposure area to the light. Accordingly, invisibility of pattern  31  shown in  FIG. 3  can be suppressed when the place (viewpoint) of listener changes. Convex part  21  may also be formed on dust cap  17 . 
     If convex part  21  is too short, diffused reflection of light increases on the front face of diaphragm  14 . In this case, the entire front face of diaphragm  14  becomes brighter. As a result, a difference between luminance of pattern  31  shown in  FIG. 3  and luminance of the front face of diaphragm  14  becomes small. On the other hand, if convex part  21  is too tall, convex part  21  itself may block light, depending on the position of listener. Therefore, the height of convex part  21  is preferably in a range from 1% to 50% of the thickness of diaphragm  14 , inclusive. The height of convex part  21  is further preferably in a range from 0.01 mm to 0.07 mm, inclusive. This configuration enables the listeners to clearly see pattern  31  and image shown in  FIG. 3  from a broader area. In particular, convex part  21  is preferably arc-shaped in cross section. This configuration can broaden a range of viewpoint where the pattern shown in  FIG. 3  can be seen clearly.  FIG. 8  is a magnified sectional view of a key part of diaphragm  14  in which convex parts  21  are provided away from each other. Convex parts  21  may be placed away from each other. 
       FIG. 9  is a magnified sectional view of a key part of diaphragm  14  in which convex parts have linear shapes in cross section. The cross-sectional shape of convex part  21  may be configured with straight lines. A tip of convex part  21  may be chamfered. For chamfering, either R-chamfering or C-chamfering is acceptable. 
     More specifically, convex part  21  preferably includes at least first reflective part  21 A and second reflective part  21 B. First reflective part  21 A is disposed so as to be tilted for a first angle with respect to the front face of diaphragm  14 . On the other hand, second reflective part  21 B is disposed at a second angle with respect to the front face of diaphragm  14 . Note that the first angle is different from the second angle. Alternatively, first reflective part  21 A may be disposed so as to be tilted for the first angle with respect to the rear face of diaphragm  14 . Second reflective part  21 B may be disposed at the second angle with respect to the rear face of diaphragm  14 . The second angle may be 0 degree. 
     Arc convex part  21  has numerous reflective parts at the micro level. This means that arc convex part  21  also has first reflective part  21 A and second reflective part  21 B. 
       FIG. 10  is a magnified sectional view of a key part of diaphragm  14  in which concave parts  22  are formed on the front face. Concave part  22  may be formed on the front face of diaphragm  14 . In this case, the bottom face of concave part  22  serves as first reflective part  21 A. On the other hand, the surface of the front face of diaphragm  14  serves as second reflective part  21 B. Accordingly, concave parts  22  are disposed away from each other. Note that it is not limited to a configuration in which the surface of the front face of diaphragm  14  serves as second reflective parts  21 B. Alternatively, first reflective part  21 A and second reflective part  21 B may be formed on concave part  22 . In this case, adjacent concave parts  22  may be provided in a connected manner. 
       FIG. 11  is a front view of diaphragm  14  on which spiral convex part  21  is formed. The shape of convex part  21  seen from the front face is spiral. In other words, a distance from the center to convex part  21  gradually reduces from the outer periphery to the center of diaphragm  14 . This configuration facilitates formation of convex part  21  by the molds when diaphragm  14  is made by resin molding. Spiral convex part  21  is formed on diaphragm  14 , but this is not limited. Spiral concave part  22  may be formed on diaphragm  14 . Still more, spiral convex part  21  or concave part  22  may also be formed on dust cap  17 . 
       FIG. 12  is a front view of diaphragm  14  on which concentric convex parts  21  are formed. Multiple convex parts  21  may be disposed so as to make a circuit of the front face of diaphragm  14 . Convex parts  21  are preferably concentric with diaphragm  14 . Concentric convex parts  21  are formed on diaphragm  14 , but this is not limited. Concentric concave parts  22  may be formed on diaphragm  14 . Still more, concentric convex parts  21  or concave parts  22  may also be formed on dust cap  17 . 
     Hereinafter, the pattern formed on diaphragm  14  is described in detail with reference to drawings.  FIG. 13  is a conceptual diagram illustrating reflection of light on diaphragm  14 .  FIG. 13  shows the case of looking at diaphragm  14  in a direction of arrow A in  FIG. 15 . In other words, diaphragm  14  is seen on an extended line of the front face of diaphragm  14  in  FIG. 13 .  FIG. 13  shows the case of emitting light only from LED  16 A. 
     Light output from LED  16 A has high linearity. However, the light output from LED  16 A still spreads as it travels away from LED  16 A. As shown in  FIG. 3 , however, pattern  31  that appears on diaphragm  14  is thinner toward center  14 E of diaphragm  14  and thicker toward outer periphery  14 F of diaphragm  14 . This is because a curvature radius of diaphragm  14  gradually increases toward outer periphery  14 F. 
     Light output from LED  16 A reaches eye  51  via, for example, route  55  and route  56 . In route  55 , light output from LED  16 A is reflected in an area near outer periphery  14 F of diaphragm  14 . On the other hand, in route  56 , light output from LED  16 A is reflected in an area near center  14 E of diaphragm  14 . However, light output from LED  16 A that passes a point farther away from a line connecting the center of light of LED  16  and eye  51  than route  56  may go through, for example, route  57 . In route  57 , light output from LED  16 A is reflected in an area near center  14 E of diaphragm  14 . As a result, the light passing route  57  does not reach eye  51 . 
     Accordingly, in the area near center  14 E of diaphragm  14 , the width of reflected light entering eye  51  becomes narrow. Conversely, in the area near outer periphery  14 F of diaphragm  14 , the width of reflected light entering eye  51  becomes wide. With the above configuration, the width of pattern  31  changes. 
       FIG. 14  is a conceptual diagram of loudspeaker  11  in the light-emitting state when seen from its front face.  FIG. 14  shows pattern  31  when only LED  16 A is illuminated.  FIG. 15  is a conceptual diagram of light reflected on diaphragm  14  when seen from its side face. Light emitted from LED  16 A reaches eye  51  via, for example, first route  52 , second route  53 , and third route  54 . 
     In first route  52 , light output from LED  16 A is reflected on point  52 A. Point  52 A is located on a face close to LED  16 A in diaphragm  14 . In other words, point  52 A is provided at a position in front of the center of diaphragm  14 . 
     First pattern  31 A shown in  FIG. 14  is formed in an area closer to LED  16 A than to the center of diaphragm  14  by this reflected light. Since first pattern  31 A is located at a position closer to LED  16 A than to the center of diaphragm  14 , first pattern  31 A is longer and brighter than second pattern  31 B, second pattern  31 C, third pattern  31 D, and third pattern  31 E. In addition, first pattern  31 A is thicker than third patterns  31 D and  31 E. An outer periphery of first pattern  31 A is brighter and thicker than the center thereof. When diaphragm  14  is seen from the front face of loudspeaker  11 , first pattern  31 A and LED  16 A are on the same straight line. 
     Next, in second route  53 , light output from LED  16 A is reflected on point  53 A. Point  53 A is located on a face farther from LED  16 A than the center of diaphragm  14 . 
     Second patterns  31 B and  31 C shown in  FIG. 14  are formed by these reflected lights in areas on the opposite side of LED  16 A with respect to the center of diaphragm  14 . When diaphragm  14  is seen from the front face of loudspeaker  11 , second patterns  31 B and  31 C are formed deviated from the line connecting LED  16 A and the center of diaphragm  14 . However, second pattern  31 B and second pattern  31 C are formed bilaterally symmetric with respect to the line connecting LED  16 A and the center of diaphragm  14 . 
     Diaphragm  14  has a cone shape. Accordingly, second pattern  31 B can be seen with left eye  51 . On the other hand, second pattern  31 C can be seen with right eye  51 . This configuration thus makes pattern  31  look like a three-dimensional image by parallax of second pattern  31 B and second pattern  31 C when the patterns are seen with both eyes  51 . 
     Second patterns  31 B and  31 C are thicker than first pattern  31 A, but their luminance is slightly low. The outer peripheries of second pattern  31 B and second pattern  31 C are thicker than the centers thereof. A reflecting surface of second route  53  is far from LED  16 A. Accordingly, portions of second patterns  31 B and  31 C close to the outer periphery of diaphragm  14  are darker than portions close to the center of diaphragm  14 . Still more, outer ends of second patterns  31 B and  31 C are positioned closer to the center than the outer end of first pattern  31 A. 
     Diaphragm  14  is preferably curved so as to protrude toward the front face, as shown in  FIG. 15 . This configuration makes diaphragm  14  itself block light passing first route  52  near the center of diaphragm  14 . The inner ends closer to the center of diaphragm  14  in ends of second patterns  31 B and  31 C are thus positioned closer to the center than the inner end of first pattern  31 A. Accordingly, pattern  31  with an extremely complicated shape is formed on diaphragm  14 . Still more, an angle of diaphragm  14  crossing voice coil  15  shown in  FIG. 1  can be made larger. Accordingly, loudspeaker  11  can reproduce up to high-frequency sounds. 
     In third route  54 , light output from LED  16 A is reflected on two points, i.e., point  54 A and point  54 B, and reaches eye  51 . Point  54 A is located on a surface closer to the LED  16 A than the center of diaphragm  14 . Point  54 B is located on a surface farther from LED  16 A than the center of diaphragm  14 . In other words, light output from LED  16 A is reflected in front of the center of diaphragm  14 , and then is reflected again at back of the center of diaphragm  14  again. The reflected lights form third pattern  31 D and third pattern  31 E in an area on the opposite side of LED  16 A with respect to the center of diaphragm  14 . 
     When diaphragm  14  is seen from the front face, third patterns  31 D and  31 E are also formed bilaterally symmetric with respect to a line connecting LED  16 A and the center of diaphragm  14 . Third pattern  31 D can be seen with left eye  51 . On the other hand, third pattern  31 E can be seen with right eye  51 . Accordingly, pattern  31  looks like a three-dimensional image by parallax of third patterns  31 D and  31 E when they are seen with both eyes  51 . 
     However, since third pattern  31 D and third pattern  31 E are formed by lights reflected twice, they are darker than first pattern  31 A, second pattern  31 B, and second pattern  31 C. Third pattern  31 D and third pattern  31 E are also shorter and thinner than first pattern  31 A, second pattern  31 B, and second pattern  31 C. Still more, outer peripheral ends of third patterns  31 D and  31 E are darker than their centers. Meanwhile, third patterns  31 D and  31 E are formed near the center of diaphragm  14 . Accordingly, widths of the outer peripheral ends and inner peripheral ends of third patterns  31 D and  31 E are almost same. 
     As described above, the outer peripheral end of pattern  31  is darker than the center, except for first pattern  31 A. In other words, luminance of second pattern  31 B, second pattern  31 C, third pattern  31 D, and third pattern  31 E gradually darkens from the center of pattern  31  toward outside. 
     For the listener, a bright part and thick part of pattern  31  look closer to the listener. On the other hand, a dark part and thin part of pattern  31  look farther away from the listener. Since the above configuration gives gradation and different width to pattern  31 , depending on areas in diaphragm  14 , pattern  31  looks further three-dimensional. 
     Since a light image is formed by light reflected on the surface of diaphragm  14 , the image has a shape along the surface shape of diaphragm  14 . In general, the surface of diaphragm  14  is curved. Accordingly, when the light image is seen from a position deviated from the front of diaphragm  14 , the light image looks curved. Accordingly, loudspeaker  11  can be decorated with an extremely complicated shape. 
     Since light of LED  16 A reaches eye  51  via multiple routes, extremely complicated pattern  31  can be formed on diaphragm  14  even with only LED  16 A. Therefore, if multiple LEDs  16  are disposed and illuminated, complicated geometric light pattern  31 , as shown in  FIG. 3 , can be formed on diaphragm  14 . For example, by illuminating the “n” number of LEDs, “n” pieces of first pattern  31 A, second pattern  31 B, second pattern  31 C, third pattern  31 D, and third pattern  31 E can be formed. 
     When the “m” number, exceeding the “n” number, of LEDs  16  are disposed, the “n” number out of the “m” number of LEDs  16  may be illuminated. By selecting and illuminating the “n” number of LEDs  16  in the “m” number of LEDs  16  as required, diversifying patterns  31  can be formed on diaphragm  14 . In addition, by disposing LEDs  16  with multiple colors, and illuminating them as required, diversifying patterns  31  with multiple colors can be formed on diaphragm  14 . Furthermore, light emission from LEDs  16  may be linked to music. This configuration enables to form pattern  31  linked to music on diaphragm  14 . 
       FIG. 16  is a conceptual diagram of electronic apparatus  61  in accordance with the exemplary embodiment. Electronic apparatus  61  includes casing  62 , signal processor  63 , and loudspeaker  11 . Signal processor  63  and loudspeaker  11  are housed in casing  62 . Signal processor  63  is electrically connected to loudspeaker  11 . Signal processor  63  supplies signals to voice coil  15  and LEDs  16  shown in  FIG. 1 . With the above configuration, the listener listening to music output from loudspeaker  11  can visually enjoy music in addition to sound. 
     Signal processor  63  preferably supplies to LEDs  16  shown in  FIG. 1  signals linked to signals supplied to voice coil  15 . This configuration changes pattern  31  shown in  FIG. 3  in line with sound. Signal processor  63  can also preferably stop supplying signals to voice coil  15  shown in  FIG. 1 . In this case, signal processor  63  supplies signals only to LEDs  16  in  FIG. 1 . This configuration enables to decorate loudspeaker  11  with pattern  31  shown in  FIG. 3  even when the listener enjoys music using earphone or headphone. 
     Signal processor  63  may also include a reproducer for sound source and an amplifier. Still more, electronic apparatus  61  may include display part  64 , such as a liquid crystal display. Electronic apparatus  61  having display part  64  can display a pattern linked to music on display part  64 . However, power consumption becomes large if display part  64  is operated. On the other hand, since loudspeaker  11  can produce complicated pattern  31  just with a few LEDs, power consumption can be reduced. 
     Electronic apparatus  61  is, for example, a personal computer (PC). However, electronic apparatus  61  is not limited to PCs. For example, electronic apparatus  61  may be a smartphone, mobile phone, mobile apparatus such as tablet terminal, audio apparatus such as mini stereo audio system, or image apparatus such as a television set. 
     Hereinafter, a mobile apparatus in accordance with the exemplary embodiment is described with reference to  FIG. 17 .  FIG. 17  is a conceptual diagram of mobile apparatus  76 . Mobile apparatus  76  is, for example, a vehicle. However, mobile apparatus  76  is no limited to vehicle. It may also be motorcycle, bus, train, ship, airplane or the like. 
     Mobile apparatus  76  includes main body  74 , driving unit  75 , and loudspeaker  11 . Driving unit  75  and loudspeaker  11  are installed to main body  74 . Main body  74  preferably includes a body and chassis. Driving unit  75  includes power generator  71 , power transmitter  72 , and steering part  73 . Steering part  73  includes a handle. Steering part  73  may also include tires. Power generator  71  is, for example, a motor or an engine. Power transmitter  72  transmits power generated in power generator  71  to the tires. 
     Loudspeaker  11  can be, for example, built in a rear tray. However, loudspeaker  11  may be installed in a front panel, door, ceiling, pillar, instrument panel, floor, or other place, besides the rear tray. Loudspeaker  11  can configure a part of car navigation system or car audio system. 
     Also in this example, same as electronic apparatus  61 , power consumption of mobile apparatus  76  can be reduced, and thus fuel efficiency of mobile apparatus  76  can be improved. Accordingly, mobile apparatus  76  can contribute to global environmental protection. 
     As described above, the loudspeaker of the present disclosure has an effect that it can be decorated with illumination of a beautiful light pattern and/or image, and is applicable to, for example, electronic apparatuses and mobile apparatuses.