Sound device
Provided is a sound device having a membrane attached between a case and an electro-acoustic transducer using an adhesive foam tape, thereby enabling the prevention of a deterioration of vibration amplitude-related properties of the membrane, and the prevention of a distortion of sound that is being delivered. The sound device includes: a waterproof air-permeable membrane permeating gas entering and exiting an electro-acoustic transducer disposed inside the sound-transmitting hole and blocking the inflow of water; and a first adhesive foam tape having one side adhered to the membrane and the other side adhered to the case to adhere an edge of the membrane to a periphery of the sound-transmitting hole of the case. The first adhesive foam tape is provided with a plurality of pores formed on adhesive surfaces of the one side and the other side respectively bonded to the membrane and the case and filled with an adhesive material.
1. A sound device having a sound-transmitting hole, the sound device comprising:
a case having a sound-transmitting hole formed therein, an electro-acoustic transducer being disposed inside the case;
a waterproof air-permeable membrane bonded inside the case to cover the sound-transmitting hole, wherein the waterproof air-permeable membrane allows gas to pass the sound-transmitting hole, but blocks inflow of water; and
a first adhesive foam tape bonding the waterproof air-permeable membrane to the inside of the case, wherein the first adhesive foam tape includes: a body; a first adhesive surface formed in one side of the body and bonded to the inside of the case; a second adhesive surface formed in the other side thereof and bonded to the waterproof air-permeable membrane; pores formed in the body; and an adhesive material filled inside the pores,
wherein the pores are open in the first adhesive surface and the second adhesive surface, but not interconnected with each other.
2. The sound device of claim 1 , further comprising: a second adhesive foam tape bonding the waterproof air-permeable membrane to the electro-acoustic transducer.
3. The sound device of claim 1 , wherein the pores comprises: first pores open to the first adhesive surface and second pores open to the second adhesive surface, and the first pores and the second pores are not interconnected with each other.
4. The sound device of claim 1 , wherein the first adhesive foam tape is formed of an elastic material and has a compressibility in a range of 20% to 70%.
5. The sound device of claim 4 , wherein the compressibility is in a range of 20% to 40%.
6. The sound device of claim 1 , wherein the waterproof air-permeable membrane is formed of elecrospun and accumulated polymer fibers.
7. The sound device of claim 6 , wherein the waterproof air-permeable membrane has a plurality of pores.
8. The sound device of claim 7 , wherein the waterproof air-permeable membrane has a porosity in a range of 20% to 90%.
9. The sound device of claim 8 , wherein the porosity is in a range of 20% to 50%.
10. The sound device of claim 6 , wherein the waterproof air-permeable membrane is a non-porous film.
11. The sound device of claim 6 , wherein the elecrospun and accumulated polymer fibers have a diameter in a range of 0.1 μm to 2 μm and the waterproof air-permeable membrane has a thickness in a range of 4 μm to 12 μm.
12. The sound device of claim 1 , wherein the first adhesive foam tape has a thickness in a range of 50 μm to 250 μm.
13. The sound device of claim 1 , wherein the first adhesive foam tape is formed of any one of an acrylic foam, a urethane foam, and a polyethylene (PE) foam.
14. The sound device of claim 1 , further comprising: a cushion member disposed between the waterproof air-permeable membrane and the electro-acoustic transducer.