Bone conduction sound transmission devices

A bone conduction sound transmission device, comprising:

• a laminated structure formed by a vibration unit and an acoustic transducer unit;
• and
• a base structure configured to load the laminated structure, and at least one side of the laminated structure being physically connected to the base structure;
• wherein
• the base structure vibrates based on an external vibration signal, and the vibration unit deforms in response to the vibration of the base structure;
• and the acoustic transducer unit generates an electrical signal based on the deformation of the vibration unit, wherein
• the vibration unit includes at least one support arm and a mass element, the mass element is connected to the base structure through the at least one support arm
• the at least one support arm includes a first bar-shaped part and a second bar-shaped part, one end of the first bar-shaped part is connected to the mass element, an other end of the first bar-shaped part is connected to one end of the second bar-shaped part;
• a length of the first bar-shaped part is within a range of 20 μm-200 μm, and a width of the first bar-shaped part is within a range of 50 μm-400 μm;
• or
• a length of the second bar-shaped part is within a range of 500 μm-1300 μm, and a width of the second bar-shaped part is within a range of 50 μm-400 μm.