Method for manufacturing sensor device
AssigneeDenso Corporation
InventorsMichitake Kuroda, Kiyoshi Otsuka
Life of this patent
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Abstract
A pressure sensor includes a sensing element in a sensing chamber defined by two cases, one of which is crimped to the other. An internal pressure of the chamber is affected by a crimping force. In the manufacturing process of the pressure sensor, the internal pressure is monitored during crimping the cases. To monitor the internal pressure, the sensing element of the pressure sensor is used. An output signal of the sensing element is sent to a crimping machine. The crimping machine controls a crimping force based on the output signal.
Claims11
A method for manufacturing a sensor device having a sensing chamber defined by a first case and a second case, one of which is crimped to the other, and a sensing portion in the sensing chamber, wherein an internal pressure of the sensing chamber is affected by a crimping force applied to the case crimped to the other, comprising:
- arranging the sensing portion in a well formed in the first case;
- introducing a pressure transmission medium in the well;
- fitting the first case and the second case together;
- applying the crimping force to one of the first and the second cases for crimping the one of the first and the second cases to the other of the first and the second cases;
- monitor the internal pressure of the sensing chamber by monitoring an output signal of the sensing portion during the application of the crimping force;
- and
- controlling the crimping force based on the monitored output signal to adjust the internal pressure of the sensing chamber to a predetermined level.
The method according to clam 1, wherein:
- the sensing chamber contains a pressure transmission medium;
- the pressure transmission medium includes oil;
- the sensing portion includes a pressure sensor;
- and
- the pressure sensor detects a pressure of the oil that varies according to the crimping force.
A method for manufacturing a sensor device having a sensing chamber defined by a first case and a second case, one of the first case and the second case crimped to the other of the first case and the second case, and a sensing portion in the sensing chamber, wherein an internal pressure of the sensing chamber is affected by a crimping force applied to the one of the first case and the second case, the method comprising:
- arranging the sensing portion in a well formed in the first case;
- introducing a pressure transmission medium into the well;
- fitting the first case and the second case together;
- applying the crimping force to the one of the first and the second cases for crimping the one of the first and the second cases to the other thereof;
- monitoring a pressure associated with the pressure transmission medium during the application of the crimping force, the pressure varying according to the crimping force;
- and
- controlling the crimping force based on the monitored pressure.
Dependencies are inferred from the claim text.