Abstract:
Provided is, in a microphone configured such that a microphone head including a microphone unit is attachably/detachably mounted to a microphone main body, a microphone which enables easy attachment/detachment of the microphone head, and which can perform a mute operation not only after removal of the microphone head but also in attachment/detachment of the microphone head. The microphone includes a mute circuit provided to a side of the microphone main body, and driven by an input of a mute command signal, a first mute control circuit provided to aside of the microphone head, and including a switch that switches disconnection/conduction of a wire, and a second mute control circuit provided to the side of the microphone main body, and electrically connected with the first mute control circuit and generates the mute command signal, in a state where the microphone head is coupled, and in attachment/detachment of the microphone head.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to a microphone configured such that a microphone unit that performs sound collection is attachably/detachably mounted to a microphone main body, and especially relates to a microphone that can be muted in attachment/detachment. 
         [0003]    2. Description of the Related Art 
         [0004]    Conventionally, in wired or wireless microphones, there are ones configured such that a microphone head having a microphone unit built in is attachably/detachably coupled to a microphone main body. As a coupling method thereof, a configuration to fix the microphone head and the microphone main body with a special coupling structure, or a configuration to attach/detach a microphone head  52  to a microphone main body  51 , using a screw mechanism  53 , as illustrated in  FIG. 9 , are typically employed. 
         [0005]    By the way, the microphone configured such that the microphone head is attachably/detachably coupled to the microphone main body as described above have a problem that a pop noise occurs in attachment/detachment. That is, if the microphone head is attached with/detached from a power source in a power-on state by mistake or on purpose, a large pop noise is caused, and the device may be damaged. 
         [0006]    To handle the problem, JP 2-126497 Y discloses a configuration to operate/disconnect a mute circuit, using a phenomenon that connection of a microphone socket intermits according to attachment/detachment of a microphone unit, in a microphone circuit configured from the microphone socket and a microphone first-stage amplifier. 
         [0007]    That is, by causing the mute circuit to function in a moment of insertion or removal of the microphone unit, the pop noise in attachment/detachment of the microphone unit is avoided. 
         [0008]    However, in the case of the illustrated screw-type attachment/detachment configuration, the microphone head  52  needs to be relatively rotated with respect to the microphone main body  51  a number of times. Therefore, there are problems that not only labor is required, but also a rubbing noise is output as a noise, until the mute circuit is operated. 
         [0009]    Further, there is a problem that the life of contacts becomes short or contact failure is caused due to friction of contacts, by the rotation of the microphone unit a number of times. 
       SUMMARY OF THE INVENTION 
       [0010]    The present invention has been made in view of the foregoing, and an objective is to provide, in a microphone configured such that a microphone head including a microphone unit that performs sound collection is attachably/detachably mounted to a microphone main body, a microphone that enables easy attachment/detachment of the microphone head, and which can perform a mute operation not only after removal of the microphone head but also in attachment/detachment of the microphone head. 
         [0011]    To solve the above-described problem, a microphone according to the present invention is a microphone having a microphone head attachably/detachably mounted to a microphone main body, the microphone head including a microphone unit that performs sound collection, and the microphone includes: a mute circuit provided to a side of the microphone main body, and configured to be driven by an input of a mute command signal; a first mute control circuit provided to a side of the microphone head, and including a switch that switches disconnection/conduction of a wire; and a second mute control circuit provided to the side of the microphone main body, and configured to be electrically connected with the first mute control circuit, and to generate the mute command signal, in a state where the microphone head is coupled, and in attachment/detachment of the microphone head, wherein the second mute control circuit outputs the mute command signal, in a state where the first mute control circuit and the second mute control circuit are electrically connected, and the wire of the first mute control circuit is conducted by the switch, or in a state where the first mute control circuit and the second mute control circuit are electrically disconnected. 
         [0012]    With such a configuration, the mute circuit can be always driven by the switch during attachment/detachment. Therefore, occurrence of the pop noise can be prevented not only after removal of the microphone head from the microphone main body, but also in attachment/detachment of the microphone head. 
         [0013]    Incidentally, it is desirable that the microphone head and the microphone main body are coupled by a bayonet-type coupling mechanism. 
         [0014]    With such a bayonet-type coupling system, attachment/detachment of the microphone head becomes easy, and connection between the first mute control circuit and the second mute control circuit can be reliably performed. 
         [0015]    In addition, it is desirable that the microphone includes a slide member provided in the microphone head, and configured to operate switching of the switch of the first mute control circuit, wherein, in a position of the slide member, where the wire of the first mute circuit is caused to be connected by the switch, rotation of the microphone main body around an axis is locked by the slide member. 
         [0016]    By providing such a slide member, the switch needs to be slid in attachment/detachment of the microphone head. Therefore, the mute circuit can be driven in attachment/detachment of the microphone head. 
         [0017]    Further, it is desirable that the microphone main body includes a main body member including the second mute control circuit connectable with the microphone head-side first mute control circuit and a cover member that covers the main body member, and the cover member is coupled to the microphone head side in a state of covering the slide member provided to the microphone head side. 
         [0018]    As described above, the slide member is usually covered with the cover member, so that careless sliding of the slide member can be prevented. 
         [0019]    In a microphone configured such that a microphone head including a microphone unit that performs sound collection is attachably/detachably mounted to a microphone main body, a microphone which enables easy attachment/detachment of the microphone head, and which can perform a mute operation not only after removal of the microphone head but also in attachment/detachment of the microphone head can be obtained. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWING 
         [0020]      FIG. 1  is a plan view of a microphone according to the present invention; 
           [0021]      FIG. 2  is a side view of the microphone of  FIG. 1 ; 
           [0022]      FIG. 3  is a sectional view illustrating an enlarged tip end side of the microphone of  FIG. 1 ; 
           [0023]      FIG. 4  is a perspective view illustrating a lower end side of a microphone head; 
           [0024]      FIG. 5  is a perspective view of a main body member included in a microphone main body; 
           [0025]      FIG. 6  is a perspective view of an exploded lower end side of the microphone head; 
           [0026]      FIG. 7  is a microphone-side mute control circuit and a main body-side mute control circuit; 
           [0027]      FIGS. 8A to 8C  are side views for describing an operation of a mute control circuit associated with attaching/detaching work of the microphone head to/from the microphone main body; and 
           [0028]      FIG. 9  is a perspective view illustrating an example of a coupling system of a microphone head and a microphone main body in a conventional microphone. 
       
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0029]    Hereinafter, embodiments of the present invention will be described based on the drawings.  FIG. 1  is a plan view of a microphone according to the present invention, and  FIG. 2  is a side view of the microphone. Further,  FIG. 3  is a sectional view illustrating an enlarged tip end side of the microphone. 
         [0030]    An illustrated microphone  1  is configured from a microphone head  2  having a microphone unit (not illustrated) built in, the microphone unit performing sound collection, and a microphone main body  3  attachably/detachably provided to the microphone head  2 . Note that, in the present embodiment, the microphone  1  illustrated in  FIG. 1  is a wireless microphone, and provided with an antenna section  30  at a rear end portion of the microphone main body  3 , and a display  26  on an peripheral surface. 
         [0031]    The microphone main body  3  is configured from, as illustrated in  FIGS. 1 to 3 , an audio substrate (not illustrated), an antenna substrate (not illustrated), a main body member  4  made of a battery and the like, a cylindrical cover member  5  made of metal, which houses the main body member  4 , and a grip end member  25  coupled to a rear portion of the cover member  5 . The main body member  4  and the cover member  5  are coupled with a side of the microphone head  2  independently of each other. 
         [0032]    The main body member  4  includes, as illustrated in the perspective view of  FIG. 5 , a disk-like contact substrate  6  for transmitting/receiving an audio signal to/from the side of the microphone head  2 , and a bayonet-type main body-side coupling portion  7  for being mechanically coupled with the side of the microphone head  2 , in a tip end of the main body member  4 . The main body-side coupling portion  7  includes three bayonet claws  7   a  formed to protrude outward around the contact substrate  6 . 
         [0033]    Further, a plurality of print patterns  6   a  (including main body-side terminals B 1  and B 2  described below) made of an ark-shaped copper wire is formed in the contact substrate  6  along a circumferential direction. Tip portions of a plurality of (five in the drawing) contact pins  8  (including microphone-side pins M 1  and M 2  described below) protruding to a lower end of the microphone head  2  and illustrated in the perspective view of  FIG. 4  abut on these print patterns  6   a,  respectively, when the microphone head  2  is coupled with the main body member  4 , and the contact pins  8  are slidable. 
         [0034]    Further, as illustrated in  FIG. 4 , a head-side coupling portion  9  that is to be engaged with the main body-side coupling portion  7  provided in the tip end side of the main body member  4  is provided in a peripheral edge portion of the lower end of the microphone head  2 . The head-side coupling portion  9  includes, for example, three bayonet claws  9   a  formed to protrude inward along the circumferential direction. 
         [0035]    As described above, the microphone head  2  and the main body member  4  include the bayonet-type coupling portions  7  and  9  that can be coupled with each other. After a bayonet claw  8   a  is inserted into a space between the adjacent bayonet claws  7   a,  the microphone head  2  is rotated around an axis with respect to the main body member  4  by a predetermined angle (60 degrees in the present embodiment), so that the bayonet claws  7   a  and  8   a  are engaged with each other, and the microphone head  2  and the main body member  4  can be easily coupled. 
         [0036]    Further, as illustrated in the exploded diagram of  FIG. 6 , the microphone head  2  includes a head case  10  that houses the microphone unit (not illustrated) that performs sound collection, and a lower end side of the head case  10  is open. An annular receiving portion  10   a  for holding ring-like bayonet members  9 A,  9 B and  9 C in a layered manner is provided to a peripheral edge portion of the lower end-side opening, and a plurality of screw holes  10   b  is formed in the receiving portion  10   a  along the circumferential direction. The bayonet members  9 A,  9 B, and  9 C are formed into a ring shape with flat upper and lower surfaces, and are used in a mutually layered manner. 
         [0037]    To be specific, the bayonet claws  9   a  are formed inside the bayonet members  9 A and  9 B, and further, the annular bayonet member  9 C is layered thereon, so that a gap is formed in a rear side of the bayonet claws  9   a.  A plurality of through holes is formed in these bayonet members  9 A,  9 B, and  9 C in the circumferential direction, and screws  13  are inserted into the through holes, screwed into the screw holes  10   b  of the receiving portion  10   a,  and attached to the receiving portion  10   a.    
         [0038]    Further, a contact substrate  11  in which the contact pins  8  are installed in a protruding manner can be attached to a side of the lower end-side opening of the head case  10 , in a state of being covered with a cap member  12 . A plurality of through holes  12   a  is formed in the cap member  12 , and tip end sides of the contact pins  8  are allowed to protrude through these through holes  12   a.    
         [0039]    Further, a microphone-side mute control circuit  20  (first microphone mute control circuit) as illustrated in  FIG. 7  is provided on the contact substrate  11 . The mute control circuit  20  includes a microphone-side pin M 1  hung on high (H) through a resistance R 1 , and a microphone-side pin M 2  connected with the microphone-side pin M 1  through a switch SW 1 . 
         [0040]    As illustrated in  FIG. 6 , the switch SW 1  is installed on the contact substrate  11 . An ON/OFF operation of the switch SW 1  is performed such that a slidably provided slide member  23  presses (SW 1  is ON) or releases (SW 1  is OFF) a guide portion  2 A 1  provided in a peripheral edge of a lower end portion of the head case  2 A, with a sliding operation thereof. 
         [0041]    The slide member  23  includes a spring support pin  23   a  protruding to a microphone tip end side, a pressing pin  23   b  that can abut on the switch SW 1 , and an attachment/detachment lock pin  23   c  protruding to a side of the microphone main body  3 . 
         [0042]    The spring support pin  23   a  is inserted into a spring  22  and supports the spring  22 . When the slide member  23  is slid to the side of the microphone head  2 , the spring  22  is compressed. Therefore, the slide member  23  is energized in an extending direction (to the side of the microphone main body  3 ). 
         [0043]    Further, the pressing pin  23   b  is arranged at a side of the switch SW 1 , and the slide member  23  is slid to the side of the microphone head  2 , so that the pressing pin  23   b  presses and causes the switch SW 1  to be in a switch-ON state. 
         [0044]    Further, as described above, when the slide member  23  is slid to the side of the microphone head  2 , the slide member  23  is energized to the side of the microphone main body  3 . Therefore, by releasing of a finger from the slide member  23 , the slide member  23  is slid to the side of the microphone main body  3 , and the pressing pin  23   b  is separated from the switch SW 1 . 
         [0045]    Further, the attachment/detachment lock pin  23   c  is inserted into (locked with) an engaging hole  27  provided in the side of the microphone main body  3 , when the microphone head  2  is coupled with the microphone main body  3 , as illustrated in  FIG. 3 . Therefore, when the microphone head  2  is detached from the microphone main body  3 , the slide member  23  is slid to the side of the microphone head  2 , the attachment/detachment lock pin  23   c  is caused to be in a pulled out state from the engaging hole  27 , and the microphone head  2  needs to be rotated around the axis. 
         [0046]    Further, the approximately cylindrical grip end member  25  made of metal (for example, made of brass) is rotatably fit to a rear end of the cover member  5  around the axis, and a screw groove (not illustrated) is formed in an inner peripheral surface of the grip end member  25 . 
         [0047]    Meanwhile, a screw groove (not illustrated) that can be screwed with the screw hole of the side of the grip end member  25  is formed in a rear portion of the main body member  4 , which is covered with the cover member  5 . 
         [0048]    Coupling of the cover member  5  and the microphone head  2  is performed such that the grip end member  25  and the rear portion side of the main body member  4  are screwed with each other, so that a front end of the cover member  5  abuts on and is fixed to a rear end side of the microphone head  2 . 
         [0049]    Further, at this time, the slide member  23  is covered with the cover member  5 , and is not exposed outside. Accordingly, an accident of careless sliding of the slide member  23  can be prevented. 
         [0050]    Further, a main body-side mute control circuit  21  (second mute control circuit) as illustrated in  FIG. 7  is provided on the contact substrate  6  of the main body member  4 , which is connected with the microphone-side pins M 1  and M 2 . 
         [0051]    The main body-side mute control circuit  21  includes a main body-side terminal B 1  that comes in contact with the microphone-side pin M 1  when the microphone head  2  is coupled, a main body-side terminal B 2  that comes in contact with the microphone-side terminal M 2 , an npn-type transistor T 1  as a switching element, and a microprocessor unit (called MPU)  29  that causes an audio mute circuit to operate. The main body-side terminal B 1  is connected to a base of the npn-type transistor T 1 , a collector is hung on high (H) through a resistance R 3 , and an emitter is connected to the main body-side terminal B 2 . Further, a resistance R 2  is provided between the main body-side terminal B 1  and the main body-side terminal B 2 . 
         [0052]    Next, operations of the mute control circuits  20  and  21  associated with attaching/detaching work of the microphone head  2  to the microphone main body  3  will be described. 
         [0053]    When the microphone head  2  is detached from the microphone main body  3 , first, the screwed grip end member  25  and main body member  4  are released, and as illustrated in  FIG. 8A , the microphone head  2  and the cover member  5  are separated, and the slide member  23  is exposed. 
         [0054]    Next, as illustrated in  FIG. 8B , the slide member  23  is slid to the side of the microphone head  2  as shown by an arrow. Accordingly, the attachment/detachment lock pin  23   c  is pulled out from the engaging hole  27 , and the switch SW 1  is turned ON. In this state, connection between the microphone-side pins M 1  and M 2 , and the main body-side terminals B 1  and B 2  is maintained. Accordingly, the base and the emitter of the transistor T 1  become the same potential, and the transistor T 1  is turned from ON to OFF. Therefore, an input port of the MPU  29  become high (H) from low (L) by the collector of the transistor T 1 , and the mute circuit is driven having the state as a mute command signal. 
         [0055]    Next, as illustrated in  FIG. 8C , the microphone head  2  is rotated around the axis with respect to the main body member  4  by a predetermined angle as shown by an arrow, and the microphone head  2  is separated from the main body member  4 . At this time, the microphone-side pins M 1  and M 2  and the main body-side terminals B 1  and B 2  are separated. However, the high (H) signal of the input port of the MPU  29  is maintained by the main body-side mute circuit  21 , and the mute circuit is kept driven. 
         [0056]    Meanwhile, when the microphone head  2  is attached to the microphone main body  3 , the microphone head  2  and the main body member  4  are coupled in a state where the slide member  23  is slid to the side of the microphone head  2 . 
         [0057]    At this time, the switch SW 1  is ON, and even when the microphone-side pins M 1  and M 2  and the main body-side terminals B 1  and B 2  are brought to come in contact with other, the high (H) signal of the input port of the MPU  29  is maintained, and the mute circuit is kept driven. 
         [0058]    Then, when the microphone head  2  and the main body member  4  are completely coupled, and the attachment/detachment lock pin  23   c  of the slide member  23  is inserted into the engaging hole  27  provided in the side of the microphone main body, the switch SW 1  is turned OFF. Further, when the switch SW 1  is turned OFF, the transistor T 1  is turned from OFF to ON, the collector of the transistor T 1  supplies a low (L) signal to the input port of the MPU  29 , and the driving of the mute circuit is stopped (mute operation is released). 
         [0059]    Finally, the rear portion of the main body member  4  and the grip end member  25  are screwed, so that the main body member  4  is completely covered with the cover member  5  (that is, the slide member  23  is covered with the cover member  5 ), coupling of the microphone head  2  and the microphone main body  3  is completed. 
         [0060]    As described above, according to an embodiment of the present invention, as the coupling system of the microphone head  2  and the main body member  4 , the bayonet-type coupling has been employed. Therefore, the microphone head  2  is rotated around the axis with respect to the main body member  4  by the predetermined angle, so that the microphone head  2  and the main body member  4  can be easily attached/detached. 
         [0061]    Further, the mute control circuits  20  and  21  are separately provided to the contact substrate  11  of the microphone head  2  and to the contact substrate  6  of the microphone main body  3 , and the mute circuit is always driven during the attaching/detaching operation. Therefore, not only after the microphone head  2  is detached from the microphone main body  3 , but also during the attaching/detaching operation, occurrence of the pop noise can be prevented. 
         [0062]    Note that, in the above embodiment, the wireless microphone has been exemplarily described as the microphone. However, the microphone according to the present invention can be also applied to a wired microphone.