Abstract: The present disclosure provides a linear vibration motor. The linear vibration motor comprises a shell having a housing space, a vibration unit housed in the housing space, an elastic member suspending the vibration unit in the housing space, and a driving unit driving the vibration unit to vibrate. The vibration unit comprises a housing portion recessed inwardly on two sides perpendicular to the vibration direction. The housing portion includes respective inner walls constituting the housing portion. The linear vibration motor further includes a blocking piece housing in the housing portion and fixedly connected to the inner wall, and a foamed cotton fixedly connected to the blocking piece and at least partially received in the housing portion, the blocking piece carrying and supporting the foamed cotton, and the blocking piece cooperating with the foamed cotton to limit the displacement of the vibration unit in the vibration direction.

Abstract: The present disclosure discloses a camera optical lens. The camera optical lens includes, in an order from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The camera optical lens further satisfies specific conditions.

Abstract: A micro speaker is disclosed. The micro speaker includes a vibration system including a diaphragm and a voice coil for driving the diaphragm, the diaphragm including a conductive dome a suspension surrounding the conductive dome; a magnetic circuit system including a lower plate, a first magnetic part on the lower plate, a second magnetic part on the lower plate, a pole plate attached to the first magnetic part and including a plurality of units, one of the first and second magnetic part being a permanent magnet for forming a magnetic gap; capacitors formed by the conductive dome and the units of the pole plate for outputting electrical signals according to vibrations of the diaphragm and for detecting real-time replacement of the diaphragm.