设|AB|=2c,则在椭圆中,有c+ 3 c=2a,∴ 1 e1 = a c = 1+ 3 2 ,而在双曲线中,有 3 c-c=2a,∴ 1 e2 = a c = 3 ?1 2 ,∴ 1 e1 + 1 e2 = 1+ 3 2 + 3 ?1 2 = 3 .故答案为: 3 .