Pressure sensor

• US 20030107491A1
• Filed: 08/21/2002
• Published: 06/12/2003
• Est. Priority Date: 12/10/2001
• Status: Active Grant

• Current Assignee: Fujikoki Corporation
• Original Assignee: Fujikoki Corporation
• Inventors: Sasaki, Keiji, Okura, Isao, Nagase, Hitoshi
• Granted Patent: US 6,745,633 B2
• Time in Patent Office: Days
• US Class Current: 340/626
• CPC Class Codes: F25B 2309/06 Compression machines, plants or systems characterised by the refrigerant being carbon dioxide
• CPC Class Codes: G01L 19/0084 to the outside of the housing other details about the housing see G01L19/14
• CPC Class Codes: G01L 19/143 Two part housings
• CPC Class Codes: G01L 19/147 Details about the mounting of the sensor to support or covering means

Abstract

A pressure sensor 1′ comprising a housing 10′ having a pressure introduction hole 12, a pressure sensing element 22 composed of a semiconductor element having piezoresistance effect, a holder 30 having fixed thereto the pressure sensing element 22, a guide member 98, a seal member 99 and a connector case 70, the pressure sensor element 22 and holder 30 joined in airtight manner to create a reference pressure chamber 72. On the holder 30 of the pressure sensor body is mounted a circuit board 40 having electrode pads, the electrode pads connected to connectors 80 fixed to the connector case 70 via conductive spring bodies 50. The guide member 98 supports holder 30, and in the opening 100 of the guide member 98 is placed the seal member 99.

Claims

1. A pressure sensor comprising:

a housing having a pressure introduction hole;

a pressure sensing element composed of a semiconductor element having piezoresistance effect;

a holder to which said pressure sensing element is fixed;

a connector case;

a pressure sensor body creating a reference pressure chamber with said pressure sensing element and said holder bonded in an airtight manner;

a circuit board having electrode pads mounted on the holder of said pressure sensor body; and

electrically conductive spring bodies having elasticity for connecting connectors fixed to said connector case to said electrode pads.

2. A pressure sensor according to claim 1, wherein one end of each said spring body for connecting the connector to the electrode pad is fixed to the lower end of each connector, the other end being bent downward and the tip of said end forming a curved portion.

3. A pressure sensor according to claim 1, wherein one end of each said spring body for connecting the connector to the electrode pad is fixed to the lower end of each connector, the other end being bent downward and the tip of said other end forming a curved portion, and the area of the spring body from the portion fixed to the lower end of the connector to the area being bent downward is supported by the bottom portion of the inner chamber of the connector case.

4. A pressure sensor according to claim 1, wherein said pressure sensor is a gauge-pressure-type pressure sensor.

5. A pressure sensor according to claim 1, wherein the reference pressure chamber is formed in an airtight manner using a pressure case, and the pressure sensor is either an absolute-pressure-type or a sealed-gauge-pressure-type pressure sensor.

10. A pressure sensor according to claim 1, wherein said pressure sensor is a gauge pressure type pressure sensor.

11. A pressure sensor according to claim 1, wherein the reference pressure chamber is formed in an airtight manner using a pressure case, and the pressure sensor is either an absolute pressure type or a sealed gauge pressure type pressure sensor.

6. A pressure sensor comprising:

a housing having a pressure introduction hole;

a pressure sensing element composed of a semiconductor element having piezoresistance effect;

a holder to which said pressure sensing element is fixed;

a connector case;

a pressure sensor body creating a reference pressure chamber with said pressure sensing element and said holder bonded in an airtight manner;

a circuit board having electrode pads mounted on the holder of said pressure sensor body;

electrically conductive spring bodies having elasticity for connecting connectors fixed to said connector case to said electrode pads; and

a seal member mounted between said pressure sensing element and said housing, the size of said seal member determined so as to adjust the load received by said pressure sensing element.

7. A pressure sensor according to claim 6, further comprising a guide member having an opening formed to the center thereof mounted between said housing and said holder, said seal member disposed within said opening of the guide member.

8. A pressure sensor according to claim 6, wherein one end of each said spring body for connecting the connector to the electrode pad is fixed to the lower end of each connector, the other end being bent downward and the tip of said end forming a curved portion.

9. A pressure sensor according to claim 6, wherein one end of each said spring body for connecting the connector to the electrode pad is fixed to the lower end of each connector, the other end being bent downward and the tip of said other end forming a curved portion, and the area of the spring body from the portion fixed to the lower end of the connector to the area being bent downward is supported by the bottom portion of the inner chamber of the connector case.