Abstract: An input terminal that includes a casing defining an opening; a holding member; a piezoelectric sensor; and an adhesive material adhering an outer peripheral edge portion of the holding member to an end edge portion of an opening of the casing. The adhesive material includes a first portion and a second portion. The first portion and the second portion differ from each other in at least one of modulus of elasticity, thickness or width.

Abstract: A biological sensor capable of improving the signal to noise ratio of a detection signal obtained by a light-receiving element and amplified by an amplifier is provided. The biological sensor includes a microcontroller that generates a driving signal, a light-emitting element that emits light in accordance with the driving signal, a light-receiving element that outputs a current detection signal based on an intensity of received light, and an amplifying circuit that converts the current detection signal into a voltage detection signal, amplifies an alternating current component of the voltage detection signal, and outputs an amplified detection signal. Furthermore, the microcontroller generates an offset signal that is applied to an offset circuit to offset the direct current component of the voltage detection signal and to obtain biological information by processing the amplified detection signal.

Abstract: A piezoelectric sensor that includes a piezoelectric film, first and second adhesive layers, first and second plate electrodes and a glass plate. The piezoelectric film includes first and second principal surfaces. The first adhesive layer attaches the first plate electrode to the first principal surface. The second adhesive layer attaches the second plate electrode to the second principal surface. The second plate electrode is attached to the glass plate such that the second adhesive layer and the second plate electrode are interposed between the piezoelectric film and the glass plate. The glass plate is distorted by being pushed. The second adhesive layer is thicker than the first adhesive layer.

Abstract: A biological sensor capable of improving the signal-to-noise ratio of a detection signal obtained by a light-receiving element and amplified by an amplifier is provided. The biological sensor includes a driving signal generating unit that generates a pulse-form driving signal, a light-emitting element that emits light in response to the generated driving signal, a light-receiving element that outputs a detection signal based on an intensity of received light, an amplifying unit including first and second operational amplifiers that amplify the outputted detection signal, an offset signal generating unit and a voltage dividing resistor group that generate a pulse-form offset voltage for offsetting a reference potential of the first operational amplifier when amplifying the detection signal and apply the offset voltage to the first operational amplifier, and a computation unit that obtains biological information by processing the detection signal amplified by the amplifying unit.

Abstract: A pressure sensor includes a piezoelectric detection electrode, an insulating substrate, a piezoelectric base film, a piezoelectric detection electrode and an insulating substrate. The insulating substrate includes a top face and a bottom face on which the piezoelectric detection electrode is formed. The insulating substrate includes a top face and a bottom face on which the piezoelectric detection electrode is formed. The pressure sensor includes the piezoelectric film whose opposite principal surfaces are provided with respective piezoelectric detection electrodes. When viewed from a direction orthogonal to the principal surfaces, an opening is provided in a center region of one of the piezoelectric detection electrodes provided on at least one of the principal surfaces.

Abstract: An input terminal that includes a casing defining an opening; a holding member; a piezoelectric sensor; and an adhesive material adhering an outer peripheral edge portion of the holding member to an end edge portion of an opening of the casing. The adhesive material includes a first portion and a second portion. The first portion and the second portion differ from each other in at least one of modulus of elasticity, thickness or width.

Abstract: A pressure sensor includes a piezoelectric detection electrode, an insulating substrate, a piezoelectric base film, a piezoelectric detection electrode and an insulating substrate. The insulating substrate includes a top face and a bottom face on which the piezoelectric detection electrode is formed. The insulating substrate includes a top face and a bottom face on which the piezoelectric detection electrode is formed. The pressure sensor includes the piezoelectric film whose opposite principal surfaces are provided with respective piezoelectric detection electrodes. When viewed from a direction orthogonal to the principal surfaces, an opening is provided in a center region of one of the piezoelectric detection electrodes provided on at least one of the principal surfaces.

Abstract: A piezoelectric sensor that includes a piezoelectric film, first and second adhesive layers, first and second plate electrodes and a glass plate. The piezoelectric film includes first and second principal surfaces. The first adhesive layer attaches the first plate electrode to the first principal surface. The second adhesive layer attaches the second plate electrode to the second principal surface. The second plate electrode is attached to the glass plate such that the second adhesive layer and the second plate electrode are interposed between the piezoelectric film and the glass plate. The glass plate is distorted by being pushed. The second adhesive layer is thicker than the first adhesive layer.

Abstract: A biological sensor capable of improving the signal to noise ratio of a detection signal obtained by a light-receiving element and amplified by an amplifier is provided. The biological sensor includes a microcontroller that generates a driving signal, a light-emitting element that emits light in accordance with the driving signal, a light-receiving element that outputs a current detection signal based on an intensity of received light, and an amplifying circuit that converts the current detection signal into a voltage detection signal, amplifies an alternating current component of the voltage detection signal, and outputs an amplified detection signal. Furthermore, the microcontroller generates an offset signal that is applied to an offset circuit to offset the direct current component of the voltage detection signal and to obtain biological information by processing the amplified detection signal.

Abstract: A biological sensor capable of improving the signal-to-noise ratio of a detection signal obtained by a light-receiving element and amplified by an amplifier is provided. The biological sensor includes a driving signal generating unit that generates a pulse-form driving signal, a light-emitting element that emits light in response to the generated driving signal, a light-receiving element that outputs a detection signal based on an intensity of received light, an amplifying unit including first and second operational amplifiers that amplify the outputted detection signal, an offset signal generating unit and a voltage dividing resistor group that generate a pulse-form offset voltage for offsetting a reference potential of the first operational amplifier when amplifying the detection signal and apply the offset voltage to the first operational amplifier, and a computation unit that obtains biological information by processing the detection signal amplified by the amplifying unit.

Abstract: A blanking plate is attached to the bottom surfaces of a split board and a remaining board, which are separated from one bare board. After depositing solder paste on a back electrode of the split board, a solder ball is attached on the solder paste. The split board is then heated to melt the solder ball. The molten solder flows along the back electrode and an edge electrode into a through-hole. A portion of the molten solder swells out of the bottom surface of the bare board, and solidifies and bonds to the back electrode and the edge electrode.

Abstract: End-face through holes each comprising a concave-curved end-face opening groove and an end-face electrode covering the inner wall of the groove are formed in the end-faces of a substrate. Furthermore, a solder having a semi-circular shape is attached to the end-face electrode. The solder comprises an electrode facing portion facing the end-face electrode in the end-face groove, and a protuberant portion elongated from the electrode facing portion to protrude on the back-surface side of the substrate. Thereby, even if the substrate or the like is warped, a gap between the end-face electrode and the electrode pad of a mother board can be filled with the protuberant portion of the solder to connect the end-face electrode and the electrode pad to each other.

Abstract: A blanking plate is attached to the bottom surfaces of a split board and a remaining board, which are separated from one bare board. After depositing solder paste on a back electrode of the split board, a solder ball is attached on the solder paste. The split board is then heated to melt the solder ball. The molten solder flows along the back electrode and an edge electrode into a through-hole. A portion of the molten solder swells out of the bottom surface of the bare board, and solidifies and bonds to the back electrode and the edge electrode.