BOJ’s Yamaguchi : BOJ’s policy doesn’t directly aim to influence FX

Policies may however indirectly weaken the yen; Will consider prices and economy before deciding on further stimulus; BOJ will guide policy under its own judgement, responsibility; Decisive action doesn’t immediately mean BOJ will ease more frequently or powerfully; Reuters

More: 
BOJ’s Yamaguchi : BOJ’s policy doesn’t directly aim to influence FX