Title:
PHYSICAL QUANTITY DETECTION DEVICE
Document Type and Number:
WIPO Patent Application WO/2022/264498
Kind Code:
A1
Abstract:
This invention provides a physical quantity detection device that is capable of suppressing positional deviation of reflow soldering between a chip package comprising a flow rate detection unit and a circuit board. This physical quantity detection device comprises a circuit board 140 and a chip package 150. The circuit board 140 comprises a plurality of lands 145 and a fixing land 146. The chip package 150 comprises a flow rate detection unit for detecting the flow rate of a gas under measurement, a plurality of outer leads 155 that protrude from both sides of the chip package 150 in the width direction Dw, and a fixing lead 156 that protrudes from the chip package 150. The distal ends of the outer leads 155 are joined via solder S to the lands 145, which are larger. The distal end of the fixing lead 156 is joined via solder S to the fixing lead 156. In the width direction Dw, the difference in length between the distal end of the fixing lead 156 and the fixing land 146 is smaller than the difference in length between the distal ends of the outer leads 155 and the lands 145.
Inventors:
SHIBATA MIZUKI (JP)
YOGO TAKAYUKI (JP)
ZHANG LINLIN (JP)
YOGO TAKAYUKI (JP)
ZHANG LINLIN (JP)
Application Number:
PCT/JP2022/005450
Publication Date:
December 22, 2022
Filing Date:
February 10, 2022
Export Citation:
Assignee:
HITACHI ASTEMO LTD (JP)
International Classes:
G01F1/684
Domestic Patent References:
| WO2019049513A1 | 2019-03-14 |
Foreign References:
| JP2015149328A | 2015-08-20 | |||
| JP2010258178A | 2010-11-11 | |||
| JP2001007491A | 2001-01-12 | |||
| JPH06252326A | 1994-09-09 |
Attorney, Agent or Firm:
HIRAKI & ASSOCIATES (JP)
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