Toshiba Corp. on Tuesday reported a group net loss of ¥12.11 billion for the April-June quarter, against a year-earlier profit of ¥470 million, due to the yen's appreciation and one-time restructuring costs.

Consolidated sales in the first quarter of fiscal 2012 fell 4.3 percent from a year earlier to ¥1.27 trillion, Toshiba said.

The yen's appreciation and market environment deterioration affected sales of digital products and electronic devices, while social infrastructure sales were brisk.

Toshiba left unchanged its earnings estimates for this fiscal year. It anticipates group net profit will expand 92.7 percent from the past year to ¥135 billion, on sales of ¥6.4 trillion, up 4.9 percent.