Sony Corp. Vice President Yutaka Nakagawa apologized Tuesday for causing concern among customers over problems with its lithium-ion batteries that have led to a massive worldwide recall.

"We take this opportunity to apologize for causing safety concerns about our lithium-ion batteries and inconvenience over their recall and exchange," Nakagawa said at a news conference.

But Naofumi Hara, a senior vice president with the company, said Sony has not considered firing or reprimanding CEO Howard Stringer, President Ryoji Chubachi or other top executives.