To provide a speaker device to make the area of a sound exit port in a sound guiding tube smaller than the vibration area of a speaker, while securing acoustic reproduction equivalent or nearly equivalent to the conventional one.
Firstly, the opening area of the sound exit port 3b is made to be smaller than the opening area of a sound entrance port 3a with regard to the sound guiding tube 3. Secondly, a position of the sound exit port 3b of the sound guiding tube 3 is set as the position where a central axis of radiation of the sound to be radiated from the speaker 2 is not blocked. Thirdly, the entire length L of the sound guiding tube 3 is made to be equal to or less than 370 mm. Fourthly, each of vertical cross-sectional area from the sound entrance port 3a to the sound exit port 3b is reduced to be the one prescribed by a fixed rule.
SHIODA TOMIO
HARADA SEIJI
