Abstract: The present invention provides a pressure detection unit and a pressure sensor using the same that have a high degree of airtightness and that are capable of suppressing bonding defects even when the base is made of ceramics. In the pressure detection unit, a linear expansion coefficient of ceramic that forms the ceramic base 110 is set to ?1 (10?6/K) and a linear expansion coefficient of metal that forms the metal ring member 140 is set to ?2 (10?6/K), a relationship of 0.7×?2??1 exists between the linear expansion coefficients ?1 and ?2, and the metal ring member 140 is formed of a metal such as SUS420J2, SUS410, or SUS444, for example, which does not precipitate aluminum oxide on a brazing surface with a projecting portion.

Abstract: The invention prevents a pressure receiving space of a pressure sensor from being electrically charged. In a pressure sensor, a diaphragm is attached to a base which is fixed within a cover and a pressure receiving space in which an oil is sealed is formed. A semiconductor type pressure detecting device is connected to a plurality of terminal pins by a bonding wire. A neutralization plate attached to a periphery of the semiconductor type pressure detecting device or a part of the periphery thereof is connected to an earth terminal pin by an earth bonding wire, or is connected to the earth terminal pin by a soldering so as to prevent an insulative medium sealed within the pressure receiving space from being electrically charged.

Abstract: Provided is a pressure sensor that is equipped with a pressure detection element and is capable of preventing data of an EPROM from being lost by application of high-voltage pulse noise to a writing terminal. A GND terminal (21d) that is one of output terminals of the pressure detection element (21) and an EPROM drain terminal (21h) that is one of EPROM writing terminals are connected via a capacitor (60). The GND terminal (21d) is grounded via a lead pin (33A). With this configuration, even when the high-voltage pulse noise is applied to the EPROM drain terminal (21h) and a lead pin (36a) connected to the EPROM drain terminal (21h), the high-voltage pulse noise can be released to ground via the capacitor (60), and data of EPROM (21a) can be prevented from being lost.

Abstract: The invention prevents a pressure receiving space of a pressure sensor from being electrically charged. In a pressure sensor, a diaphragm is attached to a base which is fixed within a cover and a pressure receiving space in which an oil is sealed is formed. A semiconductor type pressure detecting device is connected to a plurality of terminal pins by a bonding wire. A neutralization plate attached to a periphery of the semiconductor type pressure detecting device or a part of the periphery thereof is connected to an earth terminal pin by an earth bonding wire, or is connected to the earth terminal pin by a soldering so as to prevent an insulative medium sealed within the pressure receiving space from being electrically charged.