Abstract: A blood pressure measurement device is characterized in that the said device is designated to arithmetically apply to the computed blood pressure value a correction value that is in accordance with the difference in atmospheric pressure between the position of the blood pressure transmitting part and the position of the heart of the subject wearing the blood pressure transmitting part as obtained from the sensor signal, on the basis of the internal pressure variation of the blood pressure transmitting part.

Abstract: A pressure detecting device includes: a resonator whose oscillation frequency varies depending on a pressure; a first oscillation circuit that oscillates the resonator and outputs a signal of a frequency corresponding to the pressure; an AT-cut quartz crystal resonator; a second oscillation circuit that oscillates the AT-cut quartz crystal resonator and outputs a reference clock signal; a measuring unit that measures the reference clock signal by the use of a reciprocal counting method; a temperature detecting unit that detects a temperature of the resonator; and a storage unit that stores coefficients of a first approximating polynomial for calculating a first correction value used to compensate for a frequency-temperature characteristic of the measuring unit, wherein the frequency-temperature characteristic of the value measured by the measuring unit includes a frequency-temperature characteristic of the AT-cut quartz crystal resonator and a frequency-temperature characteristic of the resonator.

Abstract: A pressure detecting device includes: a resonator whose oscillation frequency varies depending on a pressure; a first oscillation circuit that oscillates the resonator and outputs a signal of a frequency corresponding to the pressure; an AT-cut quartz crystal resonator; a second oscillation circuit that oscillates the AT-cut quartz crystal resonator and outputs a reference clock signal; a measuring unit that measures the reference clock signal by the use of a reciprocal counting method; a temperature detecting unit that detects a temperature of the resonator; and a storage unit that stores coefficients of a first approximating polynomial for calculating a first correction value used to compensate for a frequency-temperature characteristic of the measuring unit, wherein the frequency-temperature characteristic of the value measured by the measuring unit includes a frequency-temperature characteristic of the AT-cut quartz crystal resonator and a frequency-temperature characteristic of the resonator.

Abstract: A blood pressure measurement device is characterized in that the said device is designated to arithmetically apply to the computed blood pressure value a correction value that is in accordance with the difference in atmospheric pressure between the position of the blood pressure transmitting part and the position of the heart of the subject wearing the blood pressure transmitting part as obtained from the sensor signal, on the basis of the internal pressure variation of the blood pressure transmitting part.

Abstract: A pressure sensor includes: a diaphragm having a pressure-receiving portion receiving a pressure and a thick portion adjacent to the pressure-receiving portion; and a pressure sensitive element having a first and a second ends facing each other. The pressure sensitive element extends in a direction intersecting the thick portion and the first end of the pressure sensitive element is bonded to a pressure-receiving surface of the pressure-receiving portion, and a central portion of a portion at which the pressure-receiving portion and the first end are bonded is positioned at a side closer to the second end of the pressure sensitive element than a center of the pressure-receiving portion.

Abstract: A pressure detection unit includes: a first piezoelectric resonator element having a vibrating portion and a pair of base portions connected to both ends of the vibrating portion; a second piezoelectric resonator element having a resonating arm and a base portion integrated with one end of the resonating arm; a diaphragm having a pair of supporting portions to which the base portions of the first piezoelectric resonator element are bonded; and a base disposed to be opposed to the diaphragm. In the pressure detection unit, the base portion of the second piezoelectric resonator element is joined to one of the base portions of the first piezoelectric resonator element in an identical plane.

Abstract: A pressure sensor includes: a diaphragm having a pressure-receiving portion receiving a pressure and a thick portion adjacent to the pressure-receiving portion; and a pressure sensitive element having a first and a second ends facing each other. The pressure sensitive element extends in a direction intersecting the thick portion and the first end of the pressure sensitive element is bonded to a pressure-receiving surface of the pressure-receiving portion, and a central portion of a portion at which the pressure-receiving portion and the first end are bonded is positioned at a side closer to the second end of the pressure sensitive element than a center of the pressure-receiving portion.