Input Device Elastic Support Mechanism for Sensor Protection
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Solution Overview
Problem
Existing input devices with pressure sensors have a limited operation stroke and poor operating feel due to the direct pressure on the actuator, which restricts the detection range and accuracy of pressing operations.
Innovation Solution
An input device design featuring an operation body with a first elastic support member and a detection member, where the operation body is supported by a case with an opening, allowing the pressure sensors to be elastically deformed during operation, enhancing the detection range and accuracy while preventing excessive pressure on the sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the actuator of the pressure sensor is directly pressed by the panel, then the detection range is limited, but the operating stroke is small and operating feeling is poor
Solution Approach 1:
The patent introduces an elastic support member as an intermediary between the operation body and the pressure sensor actuator. This elastic member transmits the pressing force while allowing the operation body to travel a longer distance, thereby resolving the contradiction between extended operation stroke and adequate detection range.
2Ease of operation
If the operation body is directly supported without elastic elements, then the structure is simple, but the operating feeling is poor and detection accuracy is limited
Solution Approach 1:
The patent changes the mechanical parameters of the support system by introducing elastic support members with specific elasticity coefficients. This allows optimization of the operation stroke and operating feeling while maintaining reasonable structural complexity through careful selection of elastic properties.
3Volume of stationary object
If the pressure sensor is directly mounted on the panel, then the device is compact, but excessive pressure may damage the sensor
Solution Approach 1:
The elastic support member serves as a cushioning element that is pre-installed between the operation body and the pressure sensor. It absorbs excessive pressing forces before they reach the sensor, protecting the sensor from damage while maintaining a compact device structure.
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
The design provides a larger operation stroke with improved operating feel, accurate detection of pressing positions, and reduced risk of sensor damage, enabling a wider dynamic range and more precise pressure detection.
Implementation Method 1
a first elastic support member which elastically supports the operation body
Implementation Method 2
a second elastic support member which supports the detection member that is pressed by the operation body and is elastically deformed when the operation surface is operated
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A rear operation body (32) is attached on a rear portion of a front case (10) via a pair of front supporting plate springs (40, 40). A front operation body (31) is provided in a frontward of the front case (10) and the front operation body (31) and the rear operation body (32) are connected via a penetration portion (14). A rear case (20) is provided in a rearward of the front case (10), and a rear supporting plate spring (50) is provided in the rear case (20). A flexible print substrate (60) is provided in a frontward thereof and a plurality of detection members (70) are mounted on the flexible print substrate (60). When an operation surface (31a) of the front operation body (31) is pressed, the front supporting plate springs (40, 40) are deformed. Thereby, the rear operation body (32) is moved such that any of the plurality of detection members (70) is operated.