Abstract:
The invention discloses a a Bluetooth earset comprising: a main body portion which has a built-in microphone; an earphone portion which is attached to the main body portion; and a connecting device which connects the main body portion to the earphone portion, wherein the earphone portion is held on the main body portion by the connecting device and the connecting device has a rotating or twisting mechanism which changes state of the earphone portion by causing the earphone portion to be rotated or twisted between a store state and a using state with respect to the main body portion.

Description:
FIELD OF THE INVENTION  
       [0001]    The invention relates to a Bluetooth earset which can be used operatively with a mobile phone. 
       BACKGROUND OF THE INVENTION 
       [0002]    The Bluetooth earset in the prior art is non ideal in the aspect of convenience for a user to use it. For example, firstly, an orientation of an earphone can not be rotated, and secondly, the Bluetooth earset can not be attached with a clamp so that when the earset is not being used, it can not be clamped at an expediently and easily available position, so it is necessary to make an improved design thereto. 
       SUMMARY OF THE INVENTION 
       [0003]    An object of the present invention is to provide an improved Bluetooth earset which can overcome the disadvantages mentioned above. The Bluetooth earset includes: a main body portion which has a built-in microphone; an earphone portion which is attached to the main body portion; and a connecting device which connects the main body portion to the earphone portion, wherein, the earphone portion is held on the main body portion by the connecting device, and the connecting device has a rotating mechanism which cause the earphone portion to be rotated between a store state and a using state with respect to the main body portion. 
         [0004]    In the Bluetooth earset according to the invention, a Y-shaped frame is provided in an end of the main body portion, a space which accommodates the earphone in the store state is provided between two Y-shaped arms of the Y-shaped frame, the connecting device is constituted by axle-bearing holes in an end of the Y-shaped arms and a rotating shaft of the earphone portion, and the earphone portion can be rotated around the rotating shaft so that a longitudinal axis of the main body portion and that of the earphone portion form an angle of about 0°˜180°. 
         [0005]    In the Bluetooth earset according to the invention, the earphone portion can be rotated around the rotating shaft into the using state in which the longitudinal axis of the main body portion and that of the earphone portion form an angle of about 90°, and the connecting device is provided within a range of the rotation angle thereof with built-in position limiting or angle limiting mechanisms and a number of groove-protruding stops which may come to a stop in midway in this range. 
         [0006]    In the Bluetooth earset according to the invention, a bevel is formed in an upper end of the main body portion, another bevel is formed in a lower end of the earphone portion, the longitudinal axes of the main body portion and the earphone portion coincide into a straight line when the two bevels are kept close to each other in the store state, the connecting device is constituted by a rotating shaft which is on one of the bevels and an axle-bearing cavity that is in the other bevel and corresponds to the rotating shaft, and the two bevels can be rotated while being kept close to each other so that the earphone portion can be rotated by about 180° from the store state in which the two longitudinal axes coincide into a straight line to the using state in which the two longitudinal axes form an angle of about 90°. 
         [0007]    In the Bluetooth earset according to the invention, the main body portion and the earphone portion have an angle of 30°˜45° between the respective bevels and the respective longitudinal axes. 
         [0008]    In the Bluetooth earset according to the invention, the connecting device is provided at two extreme ends of the range of the rotation angle thereof with built-in position limiting or angle limiting mechanisms. 
         [0009]    In the Bluetooth earset according to the invention, the Bluetooth earset is attached with a spring clamp. 
         [0010]    In the Bluetooth earset according to the invention, a rotating shaft for opening and closing the spring clamp is located in a position near a lower end of the main body portion, and a clamp mouth end of the spring clamp is located in a position near the earphone portion. 
         [0011]    In the Bluetooth earset according to the invention, a rotating shaft for opening and closing the spring clamp is located in a position near an upper end of the main body portion, and a clamp mouth end of the spring clamp is located in a position away from the earphone portion. 
         [0012]    In the Bluetooth earset according to the invention, a hollow hole is provided in a clamping face of the spring clamp. 
         [0013]    In the Bluetooth earset according to the invention, the spring clamp is in a hollow frame shape. 
         [0014]    In the Bluetooth earset according to the invention, the spring clamp is in a grid shape. 
         [0015]    In the Bluetooth earset according to the invention, the main body portion is also attached with an interface which receives and stores external information in a wired manner. 
         [0016]    In the Bluetooth earset according to the invention, the earphone portion can be rotated by an angle of at least 90° with respect to the main body portion. 
         [0017]    In the Bluetooth earset according to the invention, the connecting device is provided with a rotating shaft. 
         [0018]    In the Bluetooth earset according to the invention, the connecting device is provided with a knob. 
         [0019]    In the Bluetooth earset according to the invention, the connecting device is provided within the range of the rotation angle thereof with a number of groove stops. 
         [0020]    In the Bluetooth earset according to the invention, the connecting device is provided with a structure which is machined and fitted precisely. 
         [0021]    The Bluetooth earset of the invention has the following advantages: (1) an orientation of the earphone can be rotated. When the orientation of the earphone is rotated to coincide with a direction of a main body of the earset, the earset takes a long bar shape with a small transverse size, which can decrease package volume of the product and reduce cost of manufacture and management. In addition, the earset is convenient to be stored, and can be placed into a pocket or a wallet. When a call is made, the earphone can be rotated to form an angle which is about 90° with respect to the main body of the earset and is adapted to be held into a user&#39;s ears. Further, the earphone can be rotated to an angle suitable for it to be held into ears when a call is made so that it is convenient to make a talk. (2) the earset can be attached with a spring clamp. When not in use, the earset can be clamped at an expediently and easily available position. When the earset is to be used, it can be found at any moment so as not to be placed everywhere so that it is hard to find the earset quickly. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0022]      FIGS. 1(   a ) to  1 ( e ) are schematic diagrams showing a Bluetooth earset which is not attached with a spring clamp according to a first embodiment of the invention, wherein,  FIG. 1(   a ) is an inner face diagram showing a store state of the Bluetooth earset,  FIG. 1(   b ) is a side face diagram showing the store state of the Bluetooth earset,  FIG. 1(   c ) is a side face diagram showing a using state of the Bluetooth earset,  FIG. 1(   d ) is an outer face diagram showing the using state of the Bluetooth earset, and  FIG. 1(   e ) is a perspective diagram showing the store state of the Bluetooth earset. 
           [0023]      FIGS. 2(   a ) and  2 ( b ) are schematic diagrams showing a spring clamp attached to the Bluetooth earset according to the first embodiment of the invention, wherein,  FIG. 2(   a ) is an inner face diagram of the spring clamp, and  FIG. 2(   b ) is a side face diagram of the spring clamp. 
           [0024]      FIGS. 3(   a ) to  3 ( g ) are schematic diagrams showing a Bluetooth earset which is attached with a spring clamp according to the first embodiment of the invention, wherein,  FIG. 3(   a ) is an inner face diagram showing a store state of the Bluetooth earset with the spring clamp,  FIG. 3(   b ) is a partially enlarged diagram of the Bluetooth earset shown in  FIG. 3(   a ),  FIG. 3(   c ) is a side face diagram showing a using state of the Bluetooth earset with the spring clamp,  FIG. 3(   d ) is a side face diagram showing the store state of the Bluetooth earset with the spring clamp,  FIG. 3(   e ) is an outer face diagram showing the store state of the Bluetooth earset with the spring clamp,  FIG. 3(   f ) is a perspective diagram showing the store state of the Bluetooth earset with the spring damp, and  FIG. 3(   g ) is a perspective diagram showing the using state of the Bluetooth earset with the spring clamp. 
           [0025]      FIGS. 4(   a ) to  4 ( g ) are schematic diagrams showing a Bluetooth earset with a bevel according to a second embodiment of the invention, wherein,  FIG. 4(   a ) is an outer face diagram showing a store state of the Bluetooth earset with the bevel,  FIG. 4(   b ) is a side face diagram showing a store state of the Bluetooth earset with the bevel,  FIG. 4(   c ) is a side face diagram showing a store state of the Bluetooth earset with the bevel,  FIG. 4(   d ) is a side face diagram showing the using state of the Bluetooth earset with the bevel,  FIG. 4(   e ) is a perspective diagram showing the store state of the Bluetooth earset with the bevel,  FIG. 4(   f ) is a perspective diagram showing the using state of the Bluetooth earset with the bevel, and  FIG. 4(   g ) is a perspective diagram showing the store state of the Bluetooth earset with the bevel. 
           [0026]      FIGS. 5(   a ) to  5 ( c ) illustrate the situation when a Bluetooth earset according to a third embodiment of the invention is being used, wherein,  FIG. 5(   a ) is an outer face diagram of the Bluetooth earset according to the third embodiment of the invention,  FIG. 5(   b ) is a side face diagram of the Bluetooth earset shown in  FIG. 5(   a ), and  FIG. 5(   c ) is a schematic diagram of a clamp. 
           [0027]      FIGS. 6(   a ) and  6 ( b ) illustrate the situation when the Bluetooth earset according to the third embodiment of the invention is being stored, wherein,  FIG. 6(   a ) is an outer face diagram of the Bluetooth earset according to the third embodiment of the invention, and  FIG. 6(   b ) is a side face diagram of the Bluetooth earset according to the third embodiment. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0028]    Exemplary embodiments of the invention will be described below with reference to the accompanying drawings. 
       First Embodiment  
       [0029]    A Bluetooth earset which is not attached with a spring clamp according to a first embodiment of the invention will be described with reference to  FIGS. 1(   a ) to  1 ( e ). 
         [0030]      FIG. 1(   a ) is an inner face diagram showing the store state of a Bluetooth earset which is not attached with a spring clamp. In  FIG. 1(   a ), a reference numeral  2  denotes a Bluetooth earset which is not attached with a spring clamp according to the first embodiment of the invention. The figure shows an “inner face” of a main body portion  3 , i.e. the face which is kept close to a user&#39;s ears and cheek in use. A reference numeral  4  denotes an earphone portion which is stored in a space  9  embraced by two Y-shaped arms  7  of a Y-shaped frame located in an upper portion of the main body  3 . A rotating shaft is provided in the bottom (an end away from an earphone head  10 ) of the earphone portion  4  and is rotated in axle-bearing holes located in both ends of the Y-shaped arms  7 . A reference numeral  6  in the figure denotes a clamp shaft which is used to support the spring clamp when the spring clamp is attached. A reference numeral  8  denotes a lower end of the main body portion  3 . 
         [0031]      FIG. 1(   b ) is a right side view of the Bluetooth earset shown in  FIG. 1(   a ). A reference numeral  11  denotes a switch button which is provided on an outer face (the face which is not kept close to a user&#39;s ears and cheek in use) of the main body portion  3 . A reference numeral  12  denotes a volume button (another volume button not shown in the figure is provided on the side opposite to that of the volume button  12 ; one of the two buttons is used to increase volume, and the other button is used to decrease volume). A reference numeral  13  denotes a socket for charging the Bluetooth earset. Other reference numerals in the figure respectively denote the same part as in the preceding figure. A dotted line and the reference numeral  10  indicate that the earphone portion  4  has been rotated to a position where the Bluetooth earset is in the store state within the space  9  embraced by the two Y-shaped arms  7 . 
         [0032]      FIG. 1(   c ) is a side face diagram showing a using state of the Bluetooth earset, whereupon the earphone portion  4  has been rotated outside the space  9  embraced by the two Y-shaped arms  7  and the Bluetooth earset is in the using state. Axes of the earphone portion  4  and the main body portion  3  form an angle A and an arched arrow near the angle denotes a direction of the rotating action. Other reference numerals in the figure respectively denote the same part as the above. With regard to the angle A, generally, it ranges from 60° to 90°. The user may select the most convenient and comfortable angle so that the main body portion  3  is kept comfortably close to a user&#39;s ear and cheek when the earphone head  10  is inserted into an earhole. 
         [0033]      FIG. 1(   d ) shows an outer face of the Bluetooth earset shown in  FIG. 1(   a ). As described above, the reference numeral  11  denotes the switch button of the Bluetooth earset  2 . 
         [0034]    In connection with  FIGS. 1(   a ) to  1 ( d ), it can be seen that the Y-shaped frame which has two Y-shaped arms  7  is provided in the upper portion of the main body portion  3  of the Bluetooth earset  2 , and the rotating shaft passes through the axle-bearong holes (not shown in the figures) of the Y-shaped arms  7  at two sides of the earphone portion  4 . In actual fabrication, position limiting (or angle limiting) mechanisms (not shown in the figures) are provided on two extreme ends of a range of the rotation angle of the earphone portion  4 . Meanwhile, a number of groove-protruding stops can be provided in the midway of the rotation so that the earphone portion  4  can come to a stop at any one groove-protruding stop in the whole range of rotation angle so as to keep the rotation angle constant, thus, the earphone portion  4  is located. When pushed again, the earphone portion  4  can be pushed to rotate to the next groove-protruding stop and to the remaining groove-protruding stops in an analogous way. The number of the groove-protruding stops may be from two to several tens (not shown in the figures) so that the user can select the most appropriate angle A therefrom. 
         [0035]      FIG. 1(   e ) shows an additional solution of the embodiment. A reference numeral  21  denotes a USB interface which is attached in the lower end  8  of the main body and which is used to receive and store external information in a wired manner. 
         [0036]    A spring clamp  31  to be attached to the Bluetooth earset  2  will be described below with reference to  FIGS. 2(   a ) and  2 ( b ). 
         [0037]      FIG. 2(   a ) shows an inner face of the spring clamp  31  to be attached to the Bluetooth earset  2 . A reference numeral  33  denotes a hollow hole which is provided to be fitted with the switch button  11  of the main body portion  3  and through which the user can press the switch button  11 . A reference numeral  35  denotes axle-bearing holes which are used to attach the clamp  31  to the main body portion  3 . A reference numeral  36  denotes a press-down portion of the clamp  31 , which is pressed down to open the clamp  31 . A reference numeral  37  denotes a clamp mouth end of the clamp. A reference numeral  34  denotes a notch for leaving a spare space for the rotation of the earphone portion  4 . 
         [0038]      FIG. 2(   b ) is a side face diagram of the spring clamp shown in  FIG. 2(   a ) and the reference numerals in the figure respectively denote the same part as the above. 
         [0039]    The Bluetooth earset which is attached with the spring clamp  31  according to the first embodiment of the invention will be described below with reference to  FIGS. 3(   a ) to  3 ( g ). 
         [0040]      FIG. 3(   a ) is a schematic diagram showing that the Bluetooth earset  2  shown in  FIG. 1(   a ) and the spring clamp  31  shown in  FIG. 2(   a ) are attached together. A reference numeral  1  denotes a Bluetooth earset attached with the spring clamp  31 . Other reference numerals in the figure respectively denote the same part as the above. 
         [0041]      FIG. 3(   b ) is a partially enlarged diagram of the Bluetooth earset shown in  FIG. 3(   a ). A clamp shaft  6  of the Bluetooth earset  2  has penetrated into the axle-bearing holes  35  of the spring clamp  31  and the spring clamp  31  is supported. A reference numeral  14  denotes a position where a spring (not shown in the figure) can be mounted. 
         [0042]      FIG. 3(   c ) is a side face diagram of the Bluetooth earset  1  with the spring clamp  31 , at this time, the Bluetooth earset  1  is in the talking (using) state. In this state, the earphone portion  4  has been rotated outside the space  9  embraced by the two Y-shaped arms  7  from the store position thereof and the earphone head  10  can be inserted into a users ear for a talk. Other reference numerals in the figure respectively denote the same part as the above. 
         [0043]      FIG. 3(   d ) shows the state in which the Bluetooth earset  1  is not used and is ready to be stored. In the figure, the earphone portion  4  has been rotated to the store position thereof, i.e. inside the space  9  embraced by the two Y-shaped arms  7 . The lower end  8  of the main body portion  3  and the press-down portion  36  of the clamp  31  are pressed by two fingers (as shown by two arrows opposite in direction), then the clamp mouth end  37  of the spring clamp  31  is opened (as shown by an arched arrow) so that the Bluetooth earset  1  can be stored at an appropriate place. Other reference numerals in the figure respectively denote the same part as the above. 
         [0044]    As shown in  FIGS. 3(   c ) and  3 ( d ), the clamp shaft  6  of the main body portion  3  is located in a position near the lower end of the main body portion  3  and the clamp mouth end  37  of the clamp  31  is located in a position near the earphone portion  4 . 
         [0045]      FIG. 3(   e ) shows another face of the Bluetooth earset shown in  FIG. 3(   a ). The hollow hole  33  in the spring clamp  31  provides a due position for the switch button  11  so that the button can be operated conveniently. Other reference numerals in the figure respectively denote the same part as the above. 
         [0046]      FIGS. 3(   f ) and  3 ( g ) are perspective diagrams of the Bluetooth earset  1  with the spring clamp  31 , further showing the store state and the using state of the Bluetooth earset  1  respectively. 
       Second Embodiment  
       [0047]    A Bluetooth earset which is attached with a spring clamp according to a second embodiment of the invention will be described below with reference to  FIGS. 4(   a ) to  4 ( g ). 
         [0048]    In  FIG. 4(   a ), a reference numeral  1 ′ denotes a Bluetooth earset which is attached with a spring clamp, a numeral  4 ′ denotes an earphone portion, a numeral  10 ′ denotes an earphone head, a numeral  31 ′ denotes a spring clamp, a numeral  6 ′ denotes a clamp shaft, a numeral  36 ′ denotes a press-down portion of the clamp, a numeral  11 ′ denotes a switch button of the Bluetooth earset, and a numeral  33 ′ denotes a hollow hole provided in the surface of the clamp for the switch button  11 ′. 
         [0049]      FIG. 4(   b ) is a left side view of  FIG. 4(   a ). A reference numeral  3 ′ denotes a main body portion, a numeral  12 ′ denotes a volume button, a numeral  13 ′ denotes a socket for charging the Bluetooth earset, a numeral  8 ′ denotes a lower end of the main body portion  3 ′, and a numeral  35 ′ denotes axle-bearing holes for the clamp shaft  6 ′ to pass through. A reference numeral  18  denotes a bevel formed in an upper end of the main body portion  3 ′, and a reference numeral  18 ′ denotes a bevel formed in a lower end of the earphone  4 ′. Each of these two bevels deflects from a longitudinal axis thereof by the same angle shown by a sign B, and the suitable angle B ranges from 30° to 45°. The two bevels  18  and  18 ′ are kept close to each other (as shown in the figure) to constitute a rotation surface in which the earphone portion  4 ′ is rotatable with respect to the main body portion  3 ′. A connecting device for the earphone portion  4 ′ and the main body portion  3 ′ includes a rotating shaft which is on one of the bevels and an axle-bearing cavity being in the other bevel and corresponding to the rotating shaft (both the rotating shaft and the axle-bearing cavity are not shown in the figure). The earphone  4 ′ shown in  FIG. 4(   b ) is in a store position, whereupon the longitudinal axes of the earphone portion  4 ′ and the main body portion  3 ′ coincide into a straight line. If the earphone portion  4 ′ is rotated by 180° in a direction shown by an arched arrow in the upper left portion in the figure, the longitudinal axes of the earphone portion  4 ′ and the main body portion  3 ′ form an angle of about 90° as shown in  FIG. 4(   d ). When the angle B=45°, the angle of the two longitudinal axes is 90°. When the angle B=30°, the angle of the two longitudinal axes is 60°. The angle of the two longitudinal axes may be deduced by reference to the angle B in the same way. In manufacture, magnitude of the angle B is selected so that the angle of the two longitudinal axes makes the user comfortable. Position limiting (or angle limiting) mechanisms (not shown in the figure) are provided on two extreme ends of a rotatable range (180°) of the rotation surface constituted by the bevels  18  and  18 ′. Other reference numerals in the figure respectively denote the same part as the above. 
         [0050]      FIG. 4(   c ) is a side face diagram showing the store state of the Bluetooth earset with bevels. As shown by two arrows opposite to each other in direction, the lower end  8 ′ of the main body portion  3 ′ and the press-down portion  36 ′ of the spring clamp  31 ′ are pressed by two fingers, as shown by an arched arrow in the figure, then the clamp mouth end  37 ′ of the clamp  31 ′ is opened so that the Bluetooth earset  1 ′ which in the store state can be clamped at an appropriate place. 
         [0051]      FIG. 4(   d ) shows a talking (using) state. The state shown in the figure is achieved by rotating the earphone portion  4 ′ shown in  FIG. 4(   b ) by 180° in the rotation surface constituted by the bevels  18  and  18 ′, then the earphone head  10 ′ can be inserted into a user&#39;s ear for use. If the earphone portion  4 ′ is required to be rotated into the store state, the earphone portion  4 ′ can be rotated by 180° in a direction of an arched arrow in an upper portion of the figure thereby to restore to the state shown in  FIG. 4(   b ) or  4 ( c ). 
         [0052]    As shown in  FIGS. 4(   c ) and  4 ( d ), the clamp shaft  6 ′ of the main body portion  3 ′ is located in a position near the lower end of the main body portion  3 ′ and the clamp mouth end  37 ′ of the clamp  31 ′ is located in a position near the earphone portion  4 ′. 
         [0053]      FIGS. 4(   e ) and  4 ( f ) are perspective diagrams respectively further showing the store state and the using state of the Bluetooth earset  1 ′. 
         [0054]    As in the first embodiment, in the second embodiment, as shown in  FIG. 4(   g ), an interface (USB interface)  21 ′ which receives and stores external information in a wired manner is provided in the lower end  8 ′ of the main body portion  3 ′. 
         [0055]    In the first embodiment, it is preferable that the outer shape of the Bluetooth earset be flat, and the earphone portion of the Bluetooth earset is rotated in and out at the longer side of the cross section (approximately a rectangle) of the Bluetooth earset so that the specific structure can be arranged. In the second embodiment, it is preferable that the cross section of the Bluetooth earset be approximately square so that it is convenient to rotate the earphone portion around the central axis of the Bluetooth earset. It is a matter of course that the square can be substituted by a square with four fillets or even an approximate circle, which is also possible. 
       Third Embodiment  
       [0056]    A Bluetooth earset according to a third embodiment of the invention will be described below with reference to  FIGS. 5(   a ) to  5 ( c ) and  FIGS. 6(   a ) and  6 ( b ). 
         [0057]      FIG. 5(   a ) is an outer face (the face which is not kept close to ears) diagram of a Bluetooth earset  301  according to a third embodiment of the invention. A reference numeral  302  denotes a main body portion with a built-in microphone, a numeral  303  denotes an earphone portion, a numeral  316  denotes a connecting device, a numeral  304  denotes a spring clamp (the spring clamp  304  can also be omitted), a numeral  305  denotes a portion of the clamp  304  to be pressed down by hand, and a numeral  306  denotes a pivot of the clamp  304 , the pivot being attached with a spring (not shown in the figure). A reference numeral  311  denotes a switch button, a numeral  312  denotes an indicating lamp, and a numeral  313  denotes a volume button. 
         [0058]      FIG. 5(   b ) is a side face diagram of  FIG. 5(   a ). It can be seen from the figure that the earphone  303  and the main body  302  form an angle of about 90° which is a commonly used angle (the rotation angle may ranges from 0° to 300°, not shown in the figure). An arrow near the earphone  303  denotes a direction in which the earphone can be rotated. In order to achieve the function of rotating the earphone, the rotation angle should be made as large as possible in manufacture and it should be ensured that the earphone can be rotated by at least 90°. For convenient use, a number of groove-protruding stops can be fabricated in the connecting device  316  in manufacture (for example, when plastic material is molded). Thus, in the whole range of the rotation angle, the earphone portion  303  can come to a stop at any one groove-protruding stop to keep the rotation angle constant, and when pushed again, the earphone portion  303  can be rotated to the next groove-protruding stop and to the remaining groove-protruding stops in an analogous way. The number of the groove-protruding stops may be from two to several tens (not shown in the figures). The connecting device  316  can also be provided with a rotating shaft (not shown in the figures). Thus, in the whole range of the rotation angle, the earphone portion  303  can come to a stop at any angle so as to keep the rotation angle constant, and when pushed again, the earphone portion  303  can be rotated to the next angle and to the remaining angles in an analogous way. The connecting device  316  can also be provided with a knob. Thus, the earphone portion  303  can come to a stop at any angle so as to keep the rotation angle constant, and when pushed again, the earphone portion  303  can be rotated to the next angle and to the remaining angles in an analogous way (not shown in the figures). The connecting device  316  can also provided within the range of the rotation angle thereof with built-in position limiting (or angle limiting) mechanisms (not shown in the figures). Thus, the earphone portion  303  can come to a stop at any angle so as to keep the rotation angle constant, and when pushed again, the earphone portion  303  can be rotated to the next angle and to the remaining angles in an analogous way (not shown in the figures). The connecting device  316  can also provided within the range of the rotation angle thereof with a number of groove stops (not shown in the figures), and the number of the groove stops may be from two to several tens. Thus, the earphone portion  303  can come to a stop at any angle so as to keep the rotation angle constant, and when pushed again, the earphone portion  303  can be rotated to the next angle and to the remaining angles in an analogous way. The connecting device  316  can also provided within the range of the rotation angle thereof with a structure (not shown in the figures) which is machined and fitted precisely and which realizes rotation and location by means of frictional force, and a friction agent can be applied to friction surfaces, for example. Thus, the earphone portion  303  can come to a stop at any angle so as to keep the rotation angle constant, and when pushed again, the earphone portion can be rotated to the next angle and to the remaining angles in an analogous way. 
         [0059]    A side face of the spring clamp  304  and the press-down portion  305  of the clamp can be seen from  FIG. 5(   b ), and the clamp  304 ′ and the press-down portion  305 ′ shown by a dotted line indicate that the clamp is pressed down by hand at the position of  305 ′ and is opened at the position of  304 ′. As shown in  FIG. 5(   b ), the pivot  306  of the clamp  304  is located in a position near an upper end of the main body portion  302  and a clamp mouth end of the clamp  304  is located in a position away from the earphone  303 . Bidirectional arched arrows near the reference numerals  304 ,  304 ′ and  305 ,  305 ′ denote a direction in which the clamp is opened or closed and a direction in which the pressing is performed by hand, respectively. A reference numeral  314  denotes an opening provided for the built-in microphone. A reference numeral  315  denotes a socket provided for charging the Bluetooth earset. Other reference numerals in the figure respectively denote the same part as the above. 
         [0060]      FIG. 5(   c ) is a schematic diagram individually showing the spring clamp  304  and the press-down portion  305 . It can be seen from the figure that the spring clamp  304  is in a hollow frame shape. Since the clamp  304  is in a frame shape, it will not shield the switch button  311  and the indicating lamp  312 . The frame shape is not limited to the shape shown in the figure and the frame shape should be a shape suitable for the Bluetooth earset  301 . The spring clamp  304  attached to the main body portion  302  may also be in a grid shape or a conventional shape (not shown in the figure). 
         [0061]      FIGS. 6(   a ) and  6 ( b ) shows that the earphone  303  shown in  FIGS. 5(   a ) and  5 ( b ) has been rotated above the main body  302  into an approximately same direction as the main body  302 . In this case, the Bluetooth earset  301  is in the store state. Other reference numerals in the figure respectively denote the same part as the above. 
         [0062]    While the exemplary embodiments of the invention have been described in detail with reference to the drawings, the invention is not restricted to the above specific embodiments. It is apparent for those skilled in the art to make various changes and modifications to the invention without departing from the spirit and scope of the invention. The scope of the invention is defined by the following claims and equivalents thereof.