1. An electronic device, comprising:
a signal converter provided with a diaphragm and configured to, when one of an acoustic signal and an electric signal is inputted, convert the inputted signal into the other signal by vibrations of the diaphragm; and
a housing provided with an internal space and configured to hold the signal converter in the internal space, wherein:
the housing is provided with an opening configured to open to an outside of the housing;
the housing has a bulkhead configured to divide the internal space into a plurality of division spaces including a first division space and a second division space;
the diaphragm configures at least part of a bulkhead forming the first division space; and
the housing is provided with a first communicating path configured to make the first division space and the opening communicate with each other and a second communicating path configured to make the second division space and the opening communicate with each other.
2. The electronic device according to Claim 1, wherein the diaphragm configures at least
part of the bulkhead forming the first division space and also configures at least part of a
bulkhead forming the second division space, and a front face that is one face of the diaphragm is
configured to adjoin the first division space and a back face that is the other face of the
diaphragm is configured to adjoin the second division space.

3. The electronic device according to Claim 2, wherein:
the plurality of division spaces further include a third division space; and the housing is further provided with a third communicating path configured to make the third division space and the opening communicate with each other.
4. The electronic device according to Claim 1, wherein:
the plurality of division spaces further include a third division space; and the diaphragm configures at least part of the bulkhead forming the first division space and also configures at least part of a bulkhead forming the third division space, and a front face that is one face of the diaphragm is configured to adjoin the first division space and a back face that is the other face of the diaphragm is configured to adjoin the third division space.
5. The electronic device according to any of Claims 1 to 4, wherein:
the housing has a sealed structure; and
a waterproof membrane configured to block liquid and allow passing of gas in the communicating path is disposed.
6. The electronic device according to any of Claims 1 to 5, wherein:
the signal converter is equipped with a driving part configured to, when the electric signal is inputted, cause the diaphragm to vibrate based on the inputted electric signal;
at least part of the driving part is disposed to a back face that is one face of the

diaphragm; and
the diaphragm is configured so that a front face that is an opposite face to the back face of the diaphragm adjoins the first division space.
7. The electronic device according to any of Claims 1 to 5, wherein:
the signal converter is equipped with a detection part configured to, when the acoustic signal is inputted, detect vibration quantity of the diaphragm corresponding to the inputted acoustic signal;
at least part of the detection part is disposed to a back face that is one face of the diaphragm; and
the diaphragm is configured so that a front face that is an opposite face to the back face of the diaphragm adjoins the first division space.
8. A mobile phone, comprising:
a signal converter provided with a diaphragm and configured to, when one of an acoustic signal and an electric signal is inputted, convert the inputted signal into the other signal by vibrations of the diaphragm; and
a housing provided with an internal space and configured to hold the signal converter in the internal space, wherein:
the housing is provided with an opening configured to open to an outside of the housing;
the housing has a bulkhead configured to divide the internal space into a plurality of division spaces including a first division space and a second division space;
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the diaphragm configures at least part of a bulkhead forming the first division space; and
the housing is provided with a first communicating path configured to make the first division space and the opening communicate with each other and a second communicating path configured to make the second division space and the opening communicate with each other.
9. The mobile phone according to Claim 8, wherein the diaphragm configures at least part of the bulkhead forming the first division space and also configures at least part of a bulkhead forming the second division space, and a front face that is one face of the diaphragm is configured to adjoin the first division space and a back face that is the other face of the diaphragm is configured to adjoin the second division space.
10. The mobile phone according to Claim 9, wherein:
the plurality of division spaces further include a third division space; and the housing is further provided with a third communicating path configured to make the third division space and the opening communicate with each other.
11. The mobile phone according to Claim 8, wherein:
the plurality of division spaces further include a third division space; and the diaphragm configures at least part of the bulkhead forming the first division space and also configures at least part of a bulkhead forming the third division space, and a front face that is one face of the diaphragm is configured to adjoin the first division space and a back face

that is the other face of the diaphragm is configured to adjoin the third division space.
12. A signal propagating method applied to an electronic device,
the electronic device including: a signal converter provided with a diaphragm and configured to, when one of an acoustic signal and an electric signal is inputted, convert the inputted signal into the other signal by vibrations of the diaphragm; and a housing provided with an internal space and configured to hold the signal converter in the internal space, and the electronic device being configured so that: the housing has a bulkhead configured to divide the internal space into a plurality of division spaces including a first division space and a second division space; and the diaphragm configures at least part of a bulkhead forming the first division space,
the signal propagating method comprising:
performing propagation of the acoustic signal between the first division space and an outside of the housing through a first communicating path formed so as to make an opening formed so as to open to the outside of the housing and the first division space communicate with each other; and
making air pass through a second communicating path formed so as to make the opening and the second division space communicate with each other.
13. The signal propagating method according to Claim 12, wherein the diaphragm
configures at least part of the bulkhead forming the first division space and also configures at
least part of a bulkhead forming the second division space, and a front face that is one face of the

diaphragm is configured to adjoin the first division space and a back face that is the other face of the diaphragm is configured to adjoin the second division space.
14. The signal propagating method according to Claim 13, wherein the plurality of division spaces further include a third division space, the signal propagating method comprising making the air pass through a third communicating path formed so as to make the opening and the third division space communicate with each other.
15. The signal propagating method according to Claim 12, wherein:
the plurality of division spaces further include a third division space; and the diaphragm configures at least part of the bulkhead forming the first division space and also configures at least part of a bulkhead forming the third division space, and a front face that is one face of the diaphragm is configured to adjoin the first division space and a back face that is the other face of the diaphragm is configured to adjoin the third division space.