Thermal-type air flow meter
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United States of America Patent
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Apr 17, 2018
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N/A
app pub date -
Feb 3, 2014
filing date -
Jul 24, 2013
priority date (Note) -
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Abstract
An object of the present invention is to provide a thermal-type air flow meter with a high measurement accuracy by reducing influence of a thermal stress generated in a resistor in an LSI while securing a high positioning accuracy flow rate detection unit. Thus, a thermal-type air flow meter is provided with: a sensor assembly 100 including an LSI 3 having a resistor 7 and a flow rate detection unit 4a which are configured by insert molding so as to expose at least a part of the flow rate detection unit 4a, a housing 301 which has secondary passages 305i, 305o and 305s, and houses the sensor assembly 100 by allowing the flow rate detection unit 4a to be arranged in the secondary passage 305s, the sensor assembly 100 being molded using a first resin, and the housing 301 being molded using a second resin, the sensor assembly 100 being fixed to the housing 301 using the second resin; and resin structures 20 and 21 which cause a tensile stress in a direction parallel to a surface on which the flow rate detection unit 4a is exposed with respect to the sensor assembly 100.
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