Electric Device Including Microspeaker Module with Vibration Function
An electric device includes a microspeaker module including an enclosure having a rectangular shape and serving as a sound box for generating sound pressure therein, a microspeaker installed on an upper surface of the enclosure for changing an electrical signal into sound pressure to generate vibration of air, and a subordinate vibration unit installed within the enclosure for vibrating, and a control unit for applying the electric signal to the microspeaker module to perform a vibration function and a sound emission function.
1 . An electric device, comprising:
a microspeaker module including a microspeaker;
a function unit configured to perform a function intrinsic to the electric device; and
a control unit configured to control the function unit to generate an electric signal and apply the generated electric signal to the microspeaker so as to simultaneously or selectively perform a vibration mode and a sound reproduction mode.
2 . The electric device of claim 1 , wherein the microspeaker module comprises:
an enclosure having an internal space and having a first opening provided on a first side surface to allow the microspeaker to be installed therein, and a second opening provided on a second side surface to allow a subordinate vibration unit to be installed therein;
a microspeaker configured to emit a sound through the first opening under the control of the control unit; and
a subordinate vibration unit configured to alleviate stiffness of air in the internal space of the enclosure.
3 . The electric device of claim 2 , wherein the control unit is configured to generate an electric signal including a vibration frequency region having a resonance frequency of the subordinate vibration unit, and to apply the generated electric signal to the microspeaker so as to perform a vibration mode.
4 . The electric device of claim 3 , wherein the vibration frequency region includes a frequency ranging from 150 to 250 Hz.
5 . The electric device of claim 2 , wherein the subordinate vibration unit comprises:
a vibration plate including an installation portion attached to a lower surface of the second side surface, a central portion on which a main body portion is installed, and a dome portion connecting the installation portion and the central portion,
wherein the main body portion increases the weight of the vibration plate.
6 . The electric device of claim 5 , wherein the main body portion is formed of a metal.
7 . The electric device of claim 5 , wherein the dome portion and the main body portion are positioned within a second opening when the subordinate vibration unit has a maximum amplitude.
8 . The electric device of claim 5 , wherein a resonance frequency of the subordinate vibration unit is lower than that of the microspeaker
9 . The electric device of claim 5 , wherein a stiffness of the subordinate vibration unit is higher than that of the microspeaker.
10 . The electric device of claim 5 , wherein the dome portion has a comb-pattern structure.