Abstract: A method of forming micro/nano channels and a method of forming micro/nano structures are provided which can easily form micro- and nano-sized channels and structures through simple processes. UV curable polymer patterns are formed on a first substrate, and the UV curable polymer patterns and a second substrate are sealed together by an electrostatic attraction. Then, a channel is formed by irradiating UV light. Also, after reversibly sealing the polymer patterns and a third substrate, prepolymer patterns are formed on the third substrate by flowing prepolymer. Then, the third is removed to form a fine structure. The nano-sized channels as well as the micro-sized channels can be formed through the substantially equal processes. Also, the reversible sealing or the irreversible sealing can be freely selected according to the coating of the curable polymer and UV irradiation time.

Abstract: A speaker system for a portable electrical equipment includes: a wireless receiving pack receiving an audio signal from the portable electrical equipment; and a speaker unit receiving the audio signal from the wireless receiving pack and outputting the audio signal as a sound, the speaker unit connected to the wireless receiving pack.