EARPHONE
FIG5 is a cross-sectional view of the right unit taken along line A-A in FIG2
FIG5 is a cross-sectional view of the right unit 1R taken along line A-A in FIG2. The cord bush 30 prevents, for example, disconnection due to bending of a signal line. The inside of the cord bush 30 is hollow. The signal line inputs the audio signal from the music player to the electroacoustic transducer. The signal line is inserted through the cord bush 30. A space inside the cord bush 30 communicates with a rear space S2 (see FIG5) within the rear housing 20. The material of the cord bush 30 is, for example, silicon. The front housing 10 is an output surface (sound emission surface) of the sound waves output from the electroacoustic transducer. The front housing 10 is disposed on a front side of a vibration direction of a diaphragm 14 (see FIG5) constituting the electroacoustic transducer. More specifically, the front housing 10 (the sound emission surface) is spaced away from a front surface of the diaphragm 14. The front housing 10 includes the sound passing hole 11 and the vent hole 12. The sound passing hole 11 and the vent hole 12 are disposed on the front housing 10 (sound emission surface). The sound waves output from the electroacoustic transducer will be output (emitted) from the sound passing hole 11 and the venting vent hole 12. More specifically, the sound waves output from the electroacoustic transducer is partially output from the right unit 1R without being blocked by the front housing 10. Thus, among the sound waves output from the electroacoustic transducer, sound waves in the high-frequency range hardly cause loss.
cross-sectional view
14
diaphragm
12
vent hole
11
sound passing hole
20
rear housing
16
protector
10
front housing
15
support
13
driver unit
['1. An earphone comprising: a diaphragm (14); and a sound emission surface (10) that is spaced away from a front surface of the diaphragm (14), wherein the sound emission surface (10) comprises a sound passing hole (11) and a vent hole (12) that sound waves generated by vibration of the diaphragm (14) pass through, the sound emission surface (10) is bulbous or dome shaped with a peripheral edge extending to a top part, the sound passing hole (11) is disposed closer to the peripheral edge of the sound emission surface (10) as compared to the vent hole (12), and the vent hole (12) is disposed closer to the top part of the sound emission surface (10) as compared to the sound passing hole (11).']