| 摘要 |
The headphone comprises a body forming an ear chamber. The periphery 7 of the chamber has a substantially straight portion 20 in front of the ear and a curved portion 22 substantially conforming to the shape of the helix and lobe parts of the ear. The two portions 20, 22 join at first upper and lower points 25, 26 of the periphery 7. The body has a first side face 6 engaging with the head of the wearer and having a radial width which gradually decreases along both portions 20, 22 of the chamber periphery 7 from a maximum value r1 in the vicinity of the first upper point 25. EEG sensors (43, fig 9) in the headband detect the sleep state of the wearer and the headphone is turned off when the wearer is asleep. |
