Physical Quantity Detection Device With Notched Circuit Board
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Solution Overview
Problem
Conventional air flow rate measuring devices for internal combustion engines have a large mounting height, which increases pressure loss and affects the reliability of the connecting portion, and do not contribute to a downsized structure.
Innovation Solution
A physical quantity detecting device with a support body and a circuit board accommodating part of the support body, reducing the mounting height of the chip package and improving the reliability of the connection portion by incorporating a flow rate detection unit and processing unit on the support body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the memory LSI package is mounted in the recessed portion of the wiring board in two layers, then the mounting area is increased, but the device size is not reduced
Solution Approach 1:
The support body is inserted into a recessed portion of the circuit board, creating a nested structure where the support body is housed within the board's thickness. This allows the sensors to be mounted on the support body while the overall device height is reduced, as the support body utilizes the recessed space rather than adding to the external dimensions.
2Ease of operation
If the mounting height of the chip package is increased, then the mounting is easier, but the reliability of the connecting portion is reduced
Solution Approach 1:
The circuit board has different local heights: a recessed portion for housing the support body and connecting portions that extend at a higher level. This local variation in height allows the connecting portions to maintain sufficient height for reliable electrical connections while the overall device height is reduced by the recessed mounting of the support body.
3Volume of moving object
If the device size is reduced, then the pressure loss is reduced, but the mounting height must be reduced
Solution Approach 1:
The support body is oriented such that its thickness direction corresponds to the height direction of the circuit board. By utilizing the thickness dimension of the support body and inserting it into the recessed portion of the board, the design transitions from a vertical stacking approach to a horizontal integration approach, reducing the overall height while maintaining functional integrity.
4Volume of moving object
If the mounting height is reduced, then the device is downsized, but the connection portion reliability must be maintained
Solution Approach 1:
The circuit board is segmented into different functional zones: a recessed portion for mounting the support body and separate connecting portions that extend to a higher level. This segmentation allows the connecting portions to maintain sufficient height for reliable electrical connections while the overall device height is reduced by the recessed mounting of the support body.
Data Source
AI summary
A compact physical quantity detecting device is provided since it is possible to lower the mounting height of a chip package by accommodating the chip package in a notched board. In the physical quantity detecting device of the present invention, a part in a thickness direction of a support body on which a flow rate detection unit and a processing unit are mounted is accommodated in a notch provided in a printed board.