Door Handle Recess Structure for Precise Pressure Detection
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Solution Overview
Problem
Existing door handle technologies face challenges in reliably detecting pressure applied to the handle due to the small deformation of substrates, making it difficult to accurately sense user interaction.
Innovation Solution
A door handle design featuring an inner case with a recess and a pressure detector that detects displacement of a first inner wall surface within the recess, amplifying pressure detection through a pillar and base configuration, allowing for more precise pressure detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the pressure sensor detects deformation of the substrate in the center portion of the door handle, then the device complexity is reduced, but the measurement precision deteriorates due to small deformation amount
Solution Approach 1:
The door handle is divided into multiple sections including an outer case, inner case, and recess portion. The pressure detection function is specifically localized to the recess portion where the inner case can deform more significantly, rather than using the entire door handle substrate as the detection area.
Solution Approach 2:
The recess portion is designed with specific structural characteristics that differ from the main door handle body. This recess creates a localized area where the inner case has greater flexibility and can undergo larger deformation when pressure is applied, thereby improving measurement precision in that specific location.
2Ease of operation
If the substrate deformation is detected at the center portion of the door handle, then the ease of operation is maintained, but the reliability of pressure detection deteriorates
Solution Approach 1:
The recess portion acts as an intermediary structure between the user's finger pressure and the pressure sensor. When the user presses the door handle, the force is transmitted through the inner case to the recess portion, which amplifies the deformation before it reaches the sensor, thereby improving detection reliability without changing the user's pressing action.
3Device complexity
If the pressure detector is positioned on the substrate center portion, then the device complexity is simplified, but the measurement precision deteriorates due to insufficient deformation
Solution Approach 1:
Instead of relying on deformation in the main plane of the door handle substrate, the invention utilizes the third dimension by creating a recess portion that allows the inner case to deform inward. This vertical/displacement dimension provides greater measurable deformation for the pressure sensor while keeping the overall structure relatively simple.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances the reliability of pressure detection within the door handle, enabling accurate sensing of user interaction and smooth operation of door mechanisms.
Implementation Method 1
a pressure detector configured to detect pressure applied to the inner case. The inner case includes a recess in proximity to an end portion in a longitudinal direction, and the pressure detector detects a displacement of a first inner wall surface on a center portion side of the inner case in the recess, caused by the pressure applied to the inner case
Data Source
AI summary
A door handle, to be attached to a door, includes an outer case, an inner case integrated with the outer case, and a pressure detector configured to detect pressure applied to the inner case. The inner case includes a recess in proximity to an end portion in a longitudinal direction, and the pressure detector detects a displacement of a first inner wall surface on a center portion side of the inner case in the recess, caused by the pressure applied to the inner case.