Abstract: A wireless earphone includes: a sensor which serves as both of an antenna configured to transmit and receive a radio signal wirelessly to and from an external device and a pad configured to receive an input manipulation of a wearer; a radio circuit configured to perform various kinds processing relating to the radio signal; and a control circuit configured to perform various kinds processing on the basis of the input manipulation. The wireless earphone further includes a capacitance element connected between the radio circuit and the sensor and between the control circuit and the sensor, the capacitance element being connected to a ground conductor in series to pass only the radio signal.

Abstract: A wireless earphone includes: a sensor which serves as both of an antenna configured to transmit and receive a radio signal wirelessly to and from an external device and a pad configured to receive an input manipulation of a wearer; a radio circuit configured to perform various kinds processing relating to the radio signal; and a control circuit configured to perform various kinds processing on the basis of the input manipulation. The wireless earphone further includes a capacitance element connected between the radio circuit and the sensor and between the control circuit and the sensor, the capacitance element being connected to a ground conductor in series to pass only the radio signal.

Abstract: An imaging apparatus includes a camera which images a person, a first sensor which outputs a first signal according to infrared light, a second sensor which outputs a second signal according to infrared light, and controller which starts imaging the person by the camera based on magnitudes of the first signal and the second signal. An infrared light detection area of the first sensor is far from an entrance of a building in comparison with an infrared light detection area of the second sensor, and the infrared light detection area of the second sensor is close to the entrance of the building in comparison with the infrared light detection area of the first sensor.

Abstract: An imaging apparatus includes a camera which images a person, a first sensor which outputs a first signal according to infrared light, a second sensor which outputs a second signal according to infrared light, and controller which starts imaging the person by the camera based on magnitudes of the first signal and the second signal. An infrared light detection area of the first sensor is far from an entrance of a building in comparison with an infrared light detection area of the second sensor, and the infrared light detection area of the second sensor is close to the entrance of the building in comparison with the infrared light detection area of the first sensor.

Abstract: An imaging apparatus which is installed on the outside of a building, and is installed so that a front of the imaging apparatus faces a person who comes to an entrance of the building includes a first sensor element which outputs a first signal according to infrared light, a second sensor element which outputs a second signal of which a polarity is inverted to a polarity of the first signal according to the infrared light, and a camera which starts imaging a person based on magnitudes of the first signal and the second signal. The first sensor element is disposed over the second sensor element in front view of the imaging apparatus.

Abstract: The invention includes a first antenna section, a second antenna section, a transmitting signal generating section configured to generate a predetermined transmitting signal for a wireless tag, a transmitting section configured to transmit the transmitting signal generated by the transmitting signal generation section from the first antenna section, and a receiving section configured to receive a response signal from the wireless tag through the second antenna section. Furthermore, the invention is constituted to include an error detecting section configured to detect a predetermined error in the response signal sent from the wireless tag and received by the antenna section, and an antenna switching section configured to carry out switching for receiving the response signal sent from the tag through the first antenna section and transmitting the predetermined transmitting signal through the second antenna section based on a result of the detection obtained by the error detecting section.

Abstract: An antenna device includes: a radiator having a meander portion; and a conductor shorter than the radiator which is disposed opposite to the radiator. A coaxial cable is connected to the radiator and conductor. Respective line lengths of the radiator and conductor satisfy a predetermined relation with respect to a wavelength of a signal to be transmitted and received. The antenna device achieves at least one of improved antenna characteristics, downsizing, and improved mechanical strength.

Abstract: An antenna device includes: a radiator having a meander portion; and a conductor shorter than the radiator which is disposed opposite to the radiator. A coaxial cable is connected to the radiator and conductor. Respective line lengths of the radiator and conductor satisfy a predetermined relation with respect to a wavelength of a signal to be transmitted and received. The antenna device achieves at least one of improved antenna characteristics, downsizing, and improved mechanical strength.

Abstract: An antenna includes a grounding plate and a plurality of radiator elements in rectangular shape. The elements are disposed on the grounding plate with its one end being electrically coupled to the grounding plate. Longitudinal lengths of the elements are set within a range of &lgr;/8-3&lgr;/8 so that working frequencies are adjusted at given frequencies. Accordingly, this one antenna can transmit and receive frequencies in a desired frequency band. A coupler is disposed between the plurality of elements, and only one element is fed with power, while the other elements are fed indirectly, so that numbers of feeding points and feed lines are reduced. Further, a distance between the grounding plate and the elements is adjusted to a 0.5-3 inch range, whereby a thin and low antenna is obtainable.