Collision Detection Sensor Rotational Mounting for Multi-Axis Acceleration
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Solution Overview
Problem
Existing collision detection sensors for airbag systems require multiple types of sensor modules to detect acceleration in different directions, leading to increased production costs and complexity, as they cannot utilize identically shaped terminals and modules across directions due to limitations in wiring patterns and terminal connections.
Innovation Solution
A collision detection sensor design that uses identically shaped terminals and modules by rotating the sensor module by 90° to accommodate different detection directions, allowing a single set of terminals to be used for multiple types of sensors, and incorporating a cuboid-shaped sensor module with specific terminal configurations to enable detection in x-, y-, and z-axis directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different elements are prepared for respective detection directions, then acceleration detection in multiple directions is achieved, but the number of types of elements increases and production complexity increases
Solution Approach 1:
The patent applies universality by designing a single type of sensor module that can detect acceleration in multiple directions (x-axis, y-axis, and z-axis) through rotational mounting. The identically shaped terminals and lands are arranged symmetrically on the back surface, allowing the same module to be mounted at different orientations to detect acceleration in different directions, thereby reducing the number of element types while maintaining multi-directional detection capability.
2Ease of manufacture
If identically shaped terminals are used without printed board, then manufacturing is simplified, but wiring patterns cannot be changed to accommodate different detection directions
Solution Approach 1:
The patent resolves this contradiction by introducing asymmetry in the rotational orientation of the sensor module while maintaining symmetry in the terminal design. The identically shaped terminals are arranged in a specific asymmetric pattern relative to the acceleration detection direction, allowing the same symmetric terminal structure to support multiple detection directions through rotational mounting. This enables wiring pattern flexibility without requiring a printed board.
3Device complexity
If sensor modules are rotated by 90° to use identically shaped terminals, then the number of module types is reduced, but terminal and land alignment must be precisely controlled
Solution Approach 1:
The patent applies preliminary action by pre-configuring the identically shaped terminals and lands in a symmetric arrangement on the sensor module back surface before mounting. This pre-configuration ensures that when the module is rotated by 90°, the terminals automatically align with the corresponding lands in the correct orientation, reducing the precision control burden during assembly while enabling the use of identically shaped terminals for multiple detection directions.
Data Source
AI summary
A collision detection sensor includes a sensor module which includes a first surface and a second surface facing each other. The first surface includes an acceleration detection element detecting a vehicle acceleration in one direction parallel thereto, and the second surface is formed with a first land and a second land. Among four corners of the second surface, one corner in a first pair of opposing corners is provided with the first land, and the other corner in the first pair of opposing corners is provided with the second land.