Abstract: This application provides an adhesive film and a preparation method thereof, a composite assembly, and an electronic device. The adhesive film is prepared through a cross-linking reaction of a prepolymer. The prepolymer includes an alkyl acrylate soft monomer and an acrylate polar monomer. A mass fraction of the alkyl acrylate soft monomer in the prepolymer is greater than or equal to 60 wt %. A mass fraction of the acrylate polar monomer in the prepolymer is less than 30 wt %. The adhesive film provided in this application has an excellent low modulus at a low temperature and a high creep recovery rate, and can be used to improve a service life of a foldable electronic device in repeated folding processes.

Abstract: The present invention relates to the technical field of electronic music instruments, and provides an electronic cymbal which comprises a support piece and a cymbal body made of a soft elastic material. A through hole is disposed in the center of the cymbal body. A connection portion for connecting the cymbal body is disposed at an upper end of the support piece. The connection portion comprises a head portion and a support rod portion which are disposed from top down and integrally formed with the support piece. A size of an outer diameter of the support rod portion is less than sizes of outer diameters of the head portion and the support piece, and a limiting step is formed at a lower end of the support rod portion. The disclosed electronic cymbal provides a better beat feel, simple structure and ease of mounting.