Vibration Actuator Contact Surface Structure for Stable Holding Force

The patent utilizes a sintered product with controlled porosity as the contact body. The porous structure allows resin to be impregnated into the void spaces, creating a composite material that combines the mechanical strength of the sintered metal with the friction properties of the resin. This approach enables the resin to be distributed throughout the contact body in a controlled manner, improving holding force while maintaining manufacturing precision through controlled impregnation processes.

The patent creates a composite contact body by combining a sintered metal product with resin material. The sintered product provides structural integrity and mechanical strength, while the resin fills the porous spaces to enhance friction characteristics and holding force. This composite structure resolves the contradiction by integrating two materials with complementary properties, achieving both high holding force and controlled resin distribution through the sintering and impregnation process.

The patent divides the contact body into distinct functional zones: a sintered metal product with controlled porosity and resin-impregnated regions. The segmentation is achieved through the natural porous structure of the sintered material, which creates numerous small void spaces throughout the body rather than requiring large external grooves. This segmented internal structure allows resin to be distributed uniformly throughout the contact body, improving holding force while simplifying the overall geometry and reducing manufacturing complexity.

The patent employs a porous sintered metal product as the base structure, eliminating the need for additional groove formation. The porous network provides inherent pathways for resin impregnation, allowing the resin to distribute itself throughout the contact body during the impregnation process. This approach simplifies the contact body structure by using the material's internal porosity rather than adding external geometric features, thereby reducing device complexity while maintaining enhanced holding force.

The patent uses a sintered metal product with controlled porosity as the foundation, which provides a rigid framework that prevents collapse during molding and resin impregnation. The porous structure allows for high resin content in the final composite without compromising structural integrity during manufacturing, because the sintered metal skeleton maintains shape stability. This approach enables increased resin proportion at the contact surface for higher holding force while avoiding the collapse issues associated with high-resin formulations in conventional molding processes.

The patent creates a composite structure where a sintered metal product serves as the structural framework and resin is impregnated into the porous spaces. This composite approach allows for high resin content in the final product because the sintered metal provides mechanical support during manufacturing. The two materials work together synergistically: the metal framework prevents collapse during molding and handling, while the resin fills the pores to provide the desired friction and holding characteristics, enabling high resin proportion without manufacturing difficulty.