Patent ID: 8733175
Filing Date: 2014-05-27
Classification: G01L

Abstract:
1. A pressure sensor comprising: a sensor chip having a support member having a gel member that continuously fills the depressed portion and at least a part of the pressure transmission passage, and that protects the diaphragm, wherein: in response to transmission of pressure of a pressure medium to the diaphragm through the gel member and deformation of the diaphragm, resistance of the gauge resistor changes; an edge of the open end of the pressure transmission passage on the mounting surface of the support member faces an surrounding region of the open end of the depressed portion on the one surface of the sensor chip; the at least part of the pressure transmission passage, which is in contact with the gel member, has minimum cross sectional area at the open end on the mounting surface and maximum cross sectional area at a place farthest from the diaphragm; the cross sectional area of the at least part of the pressure transmission passage at a given place is greater than or equal to that between the diaphragm and the given place; the support member includes a first support part having the mounting surface; the first support part further has a rear surface opposite to the mounting surface and defines a first pressure transmission passage part penetrating from the mounting surface to the rear surface; the sensor chip is bonded to the mounting surface of the first support part with an adhesive; the first pressure transmission passage part is included in the pressure transmission passage; the cross sectional area of the first pressure transmission passage part at a first location is larger than the cross sectional area of the first pressure transmission passage part at a second location; the first location is the open end of the first pressure transmission passage part on the mounting surface; the second location is a location farthest from the diaphragm among a portion of the first pressure transmission passage part contacting with the gel member; and the first support part is a part to which the sensor chip is fixed via only the adhesive.