Patent Publication Number: US-2003223598-A1

Title: Sound picking device for microphones

Description:
FIELD OF THE INVENTION  
       [0001] The present invention relates to a sound picking device including two transferring devices which generate two opposite signals for an income noise and the two opposite signals are eliminated so that no noise is generated.  
       BACKGROUND OF THE INVENTION  
       [0002] A conventional microphone  1  is shown in FIG. 1 and generally includes head  12  and a shank  11 . The head  12  includes a casing  121  with a plurality of apertures  122  defined therethrough and a sound picking device  124  is received in an interior  123  of the casing  121 . An amplifier  111  is received in the shank  11  and a switch  13  is connected to the shank  11 . An emitting member  2  is connected to the bottom of the shank  11  so as to send a signal therefrom which is then transferred into a sound by a proper machine. However, an inherent problem for the conventional microphone is that when the microphone is hit unintentionally, a huge noise generates. This is because the impact to the microphone is picked by the sound picking device  124  and is amplified by the amplifier  111 . Although some manufacturers mount a spring or a rubber pad connected to the sound picking device to reduce the vibration to reduce noise, it is not satisfied by the users.  
       SUMMARY OF THE INVENTION  
       [0003] In accordance with one aspect of the present invention, there is provided a microphone that has two transferring members respectively located in two chambers of the microphone. Each transferring member has a positive output terminal and a negative output terminal. The two positive output terminals are connected to each other and the two negative output terminals are connected to each other. The sound caused by touching the microphone activates the two transferring members which generate two reverse signals which are eliminated eventually.  
       [0004] The primary object of the present invention is to provide a microphone generates no noise when the microphone is touched or scraped.  
       [0005] The present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, a preferred embodiment in accordance with the present invention. 
     
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
     [0006]FIG. 1 shows a conventional microphone which shows a sound picking device;  
     [0007]FIG. 2 is a cross sectional view to show the microphone of the present invention;  
     [0008]FIG. 3 shows the circuit of the transferring members, the sound picking devices and the output terminals of the microphone of the present invention, and  
     [0009]FIG. 4 shows an amplifier received in the microphone of the present invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT  
     [0010] Referring to FIGS.  2  to  4 , the microphone of the present invention comprises a head  3  and a shank  31 . A plurality of output terminals  311  are connected to a bottom of the shank  31 . A separation board  41  is connected between the head  3  and the shank  31  so as to define a first chamber  322  in the head  3  and a second chamber  312  in the shank  31 .  
     [0011] A casing  32  having a plurality of apertures  321  is connected to the head  3  and encloses the first chamber  322  so that sound may enter in the first chamber  322  via the apertures  321 . A circuit board  44  is engaged with a hole  411  defined through the separation board  41 .  
     [0012] A first transferring member  42  is received in the first chamber  322  and has a first sound picking device  421  which is connected to a first positive output terminal  422  and a first negative input terminal  423  on the circuit board  44 . The first sound picking device  421  is a coil type sound picking device and includes a casing  424  and a vibration film  425  which is connected to a top of the casing  424 . A magnet  426  is received in the casing  424  and located beneath the vibration film  425 . A coil  427  is mounted to the magnet  426  and connected to the first positive output terminal  422  and the first negative output terminal  423  so as to transfer a sound into a signal.  
     [0013] A second transferring member  43  is received in the second chamber  312  and has a second sound picking device  431  which is connected to a second positive output terminal  432  and a second negative input terminal  433  on the circuit board  44 . The second picking device  431  has the same structure as the first sound picking device  421 .  
     [0014] The first positive output terminal  422  is connected to the second positive output terminal  432 , and the first negative input terminal  423  is connected to the second negative input terminal  433 . The two connections form a first output unit  44   a  and a second output unit  44   b  which is connected to the earth. The circuit is then connected to an amplifier which can be located at the microphone or outside of the microphone.  
     [0015] The first sound picking device  421  and the second sound picking device  431  are activated by the same sound and transfer the sound into the same signal. The circuit board  44  seals the hole  411  of the separation board  41  so that a sound coming from outside of the microphone can only enter the first chamber  322 . Only a sound that is caused by hitting the microphone can enter both the first chamber  322  and the second chamber  312 .  
     [0016] When a noise caused by hitting or scraping the shank  31  or the casing  32  of the microphone, the sound activates the vibration film  425  on the casing  424  of the first sound picking device  421  and the vibration film on the casing of the second sound picking device  431 . The two coils  427  and  437  are activated to generate a current which is transferred into a signal by the two transferring members  42 ,  43  simultaneously. The two respective position output terminals  422 ,  432  both output the same signals to the first output unit  44   a  so that the two signals are eliminated to each other so as to avoid a noise from being generated.  
     [0017] When a sound coming from outside of the microphone, only the first sound picking device  421  is activated and a signal is sent to the first output unit  44   a  and amplified via the output terminals  311 .  
     [0018] By this arrangement, the microphone will not generate any noise caused by scraping or hitting the microphone. FIG. 5 shows that the amplifier  51  can be received in the shank  31  of a cordless microphone.  
     [0019] While we have shown and described the embodiment in accordance with the present invention, it should be clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.