A pressure intensifier for generating relatively large output force includes a piston driven in an advancing and a retracting direction. In an embodiment, logic redirects one or more navigational hints to one or more trembler devices instead of a display device andor speakers of the mobile computing device in response to a request to provide haptic directional cues. The spacer includes ribs defining the spiral grooves. The invention also describes a method of treatment for such diseases. A metal material is used as the thermal connecting member, and an adhesion preventing member is provided so as to be separated from the electronic component, the adhesion preventing member being configured to prevent the metal material molten and flowing at a heating time being adhered to the electronic component.