| 摘要 |
A foldable portable telephone set is foldable so as to be conveniently carried, and allows a speech communication when it is open. A light-emitting portion which emits light when an incoming call is received, and a light-detecting portion which detects light from the light-emitting portion. When the telephone set is folded, the light-detecting portion can detect light from the light-emitting portion. When the telephone set is open, the light-detecting portion cannot detect light from the light-emitting portion. This foldable portable telephone set includes an automatic off-hook function. Hence, after light emission of the light-emitting portion is started when an incoming call is received, if light from the light-emitting portion is detected once by the light-detecting portion but is not detected by the light-detecting portion again immediately thereafter, the foldable portable telephone set automatically shifts to a speech communication mode even if speech communication start operation is not performed.
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