A micro-speaker includes a frame body, a diaphragm arranged on the frame body, a magnetic structure and a voice coil arranged in the frame body. An upper end of the voice coil is fixed to the diaphragm. The magnetic structure is arranged under the voice coil. A voice coil balancing system is provided in the frame body, which is composed of two symmetrically arranged dampers and two symmetrically arranged elastic members, which are paired and respectively arranged at mounting portions under two opposite ends of a long axis of the frame body and fixed with glue. Each of the two dampers is made of a flexible circuit board, including a first end, a second end and a cantilever connecting the first end and the second end. A ratio of a length L of the cantilever to a distribution distance D of the cantilever is between 2-15.

Disclosed is a sound transducer, which can be assembled, integrated or installed primarily in the consumer, pro audio, installation and automotive sectors on land, water and air with minimal space requirements, use of materials and weight. The transducer includes a ring sound wave shaper having a very flat, thin multi-layered, flexible membrane, which generates point-shaped or ring-shaped sound within the membrane diameter.

Disclosed are a voice coil assembly and a loudspeaker, comprising a main voice coil and a connecting coil connected to the main voice coil, the main voice coil is connected to an external circuit, and comprises a first voice coil and a second voice coil, the first voice coil is formed by winding a conductive first wire with self-bonding coating, the second voice coil is formed by winding a second wire with self-bonding coating, the first voice coil and the second voice coil are positioned close to each other and bonded together, the first voice coil and the second voice coil are connected in series or in parallel, the connecting coil is formed by winding a third wire, and the density of the third wire is less than or equal to that of the first wire and the second wire.

Disclosed are a voice coil assembly and a loudspeaker, comprising a main voice coil and a connecting coil connected to the main voice coil, the main voice coil is connected to an external circuit, and comprises a first voice coil and a second voice coil, the first voice coil is formed by winding a conductive first wire with self-bonding coating, the second voice coil is formed by winding a second wire with self-bonding coating, the first voice coil and the second voice coil are positioned close to each other and bonded together, the first voice coil and the second voice coil are connected in series or in parallel, the connecting coil is formed by winding a third wire, and the density of the third wire is less than or equal to that of the first wire and the second wire.

A display apparatus according to an embodiment of the present disclosure includes: a display cell that displays an image and has a thin-plate shape; one or more vibration exciters that are disposed on rear-surface side of the display cell and cause the display cell to vibrate; and an opposing plate opposed to the display cell with an air gap in between. The display apparatus further includes a sound-spreading adjustment member that is disposed between the display cell and the two or more vibration exciters, and controls spreading of a sound generated by vibration caused by the two or more vibration exciters.

The present invention provides an acrylic damping adhesive. The acrylic damping adhesive comprises a crosslinked structure of a carboxy-containing acrylic polymer with a glass transition temperature less than or equal to −20° C. and a carboxy-containing acrylic polymer with a glass transition temperature ranging from 20° C. to 50° C. The acrylic damping adhesive according to technical solutions of the present invention exhibits double damping peaks in a rheological curve, and thus has a wider damping temperature range (the damping temperature range is greater than or equal to 50° C., and preferably greater than or equal to 90° C.), a higher frequency response of damping, and higher system stability.

The present invention provides an acrylic damping adhesive. The acrylic damping adhesive comprises a crosslinked structure of a carboxy-containing acrylic polymer with a glass transition temperature less than or equal to −20° C. and a carboxy-containing acrylic polymer with a glass transition temperature ranging from 20° C. to 50° C. The acrylic damping adhesive according to technical solutions of the present invention exhibits double damping peaks in a rheological curve, and thus has a wider damping temperature range (the damping temperature range is greater than or equal to 50° C., and preferably greater than or equal to 90° C.), a higher frequency response of damping, and higher system stability.

A micro-speaker includes a frame body, a diaphragm arranged on the frame body, a magnetic structure and a voice coil arranged in the frame body. An upper end of the voice coil is fixed to the diaphragm. The magnetic structure is arranged under the voice coil. A monolithic, one-piece voice-coil balancing system is fixed under the frame body. The monolithic, one-piece voice coil balancing system is composed of two symmetrically arranged dampers connected to an integrally formed support frame. The two dampers and the support frame are made of a flexible circuit board. Each of the two dampers comprises a first end, a second end and a cantilever connecting the first end and the second end. A ratio of a length L of the cantilever to a distribution distance D of the cantilever is between 2-15.

A micro-speaker includes a frame body, a diaphragm arranged on the frame body, a magnetic structure and a voice coil arranged in the frame body. An upper end of the voice coil is fixed to the diaphragm. The magnetic structure is arranged under the voice coil. A monolithic, one-piece voice-coil balancing system is fixed under the frame body. The monolithic, one-piece voice coil balancing system is composed of two symmetrically arranged dampers connected to an integrally formed support frame. The two dampers and the support frame are made of a flexible circuit board. Each of the two dampers comprises a first end, a second end and a cantilever connecting the first end and the second end. A ratio of a length L of the cantilever to a distribution distance D of the cantilever is between 2-15.

Provided is a bone conduction hearing aid device, including: a housing, a piezoelectric vibration assembly and a vibration transmission element, the piezoelectric vibration assembly and the vibration transmission element are both arranged in the housing, a first end of the vibration transmission element is connected with the piezoelectric vibration assembly, a second end of the vibration transmission element is connected with the housing, and the housing includes a vibration output portion that outputs vibration through contact.