Acoustic speaker device

#The present invention relates to an acoustic speaker device, and particularly relates to an acoustic speaker device having enhanced ability to reproduce bass range.

#Recently, downsizing of an acoustic device is progressed, and downsizing and/or reduction of thickness (hereinafter, referred to as “downsizing and the like”) is also progressed for an acoustic speaker device. However, it is known that the reproduction of the bass range is difficult since the acoustic speaker device with the downsizing and the like has smaller volume of the cabinet.

#More specifically, a general acoustic speaker device is configured to include a speaker unit incorporated in a cabinet. When electric signal is applied to the speaker unit, air in the cabinet is compressed by vibration of the speaker, which serves as an air spring to disturb the movement of the speaker. Smaller volume of the cabinet exhibits larger influence for preventing the movement of the speaker, and therefore this reduces the sound pressure level particularly in the bass region, increasing the lowest resonance frequency. Consequently, in order to enhance the ability to reproduce the bass range, it is necessary to increase the volume of the cabinet, and nevertheless, the increased volume would disturb the downsizing and the like of the acoustic speaker device.

#FIG. 1 is a schematic cross-sectional view, showing a schematic configuration of an acoustic speaker device according to an embodiment of the present invention.

#FIG. 2 is a schematic cross-sectional view, showing an example of a configuration of a sheet-like moisture adsorbing material included in the acoustic speaker device shown in FIG. 1.

#FIG. 3 is a graph, showing moisture adsorption isotherm for an activated carbon which a hydrophobizing treatment is made and an activated carbon which a hydrophobizing treatment is not made in a reference example of the present invention.

#Hereinafter, preferable Embodiments of the present invention will be described in reference to the annexed figures. Hereinafter, same reference numeral is assigned to same or corresponding element in all diagrams, and the duplicated description is not given. Also, it is not intended to limit the present invention by the present embodiment.

#[Configuration of Acoustic Speaker Device]

#First of all, an example of a configuration of an acoustic speaker device according to the present embodiment will be specifically described in reference to FIG. 1. As shown in FIG. 1, an acoustic speaker device 10 is a closed type speaker device, which includes a cabinet 12, a speaker unit 13, a porous carbon material package unit 14A, and a sheet-like moisture adsorbing material 14B.