已知\(f(x)= \dfrac {x}{4x+1}\)，数列\(\{a _{n} \}\)的首项\(a_{1}=1,a_{n+1}=f(a_{n})(n∈N^{*})\)
\((1)\)求数列\(\{a _{n} \}\)的通项公式；
\((2)\)设\(b_{n}= \dfrac {2^{n}}{a_{n}}\)，数列\(\{b _{n} \}\)的前\(n\)项和为\(S _{n}\)，求使\(S _{n} > 2012\)的最小正整数\(n\)．