Patent ID: 9560457
Date: 2017-01-31
CPC Classifications: H04R

Claim:
1. A plug connector, comprising: a jack portion into which a pin of a microphone-equipped headphone plug, in which one or more speaker contact portions connected to one or more speakers, respectively, of a headphone, a ground contact portion connected to a ground wire of the headphone, and a microphone contact portion connected to a microphone of the headphone are sequentially formed in an axial direction starting from a tip end of the pin while insulating portions are interposed respectively between the contact portions, is to be inserted, the jack portion having one or more first contacts respectively in contact with the one or more speaker contact portions, a second contact which is in contact with the ground contact portion, and a third contact which is in contact with the microphone contact portion, in a state where the pin is inserted in the jack portion, the jack portion including a switch in which, when the tip end of the pin is separated from one of the one or more first contacts, ON/OFF states are switched; a bias circuit which is configured to supply a bias voltage to the third contact through a resistor; and a control circuit which is configured to detect that the pin is extracted from the jack portion when detecting a change of a potential of the third contact before the ON/OFF states of the switch are switched, the control circuit being further configured to detect that the pin is extracted from the jack portion when detecting switching of the ON/OFF states of the switch before the potential of the third contact is changed,