Electronic Pen Strain Gauge Miniaturization via Orthogonal Planar Arrangement
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Solution Overview
Problem
Conventional electronic pens using strain gauges face challenges in miniaturization, leading to increased casing thickness, making it difficult to achieve thin and compact designs while maintaining effective force detection capabilities.
Innovation Solution
The electronic pen incorporates a strain generating body with a planar portion orthogonal to the axial direction, featuring strain sensitive elements and a control circuit connected via an electrical conductor, allowing for efficient signal processing and force detection while minimizing casing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional force detecting sensor using a strain gauge is used, then accurate force detection is achieved, but the electronic pen becomes thick and difficult to miniaturize
Solution Approach 1:
The strain sensitive elements are arranged on a planar portion that extends in a direction orthogonal to the axial direction of the casing. This dimensional reorientation allows the sensing elements to be positioned perpendicular to the main axis, reducing the axial thickness required for force detection while maintaining detection accuracy through the planar configuration of the strain gauge.
Solution Approach 2:
The electrical conductor is configured to extend in the axial direction and electrically connect the strain sensitive elements arranged on the planar portion to the control circuit. This integrated conductor design combines the electrical connection function with the compact structural arrangement, eliminating the need for separate connection components and enabling miniaturization of the overall sensor assembly.
2Length of moving object
If the electronic pen is thinned and miniaturized, then compact design is achieved, but it becomes difficult to accommodate a three-axis force detecting sensor
Solution Approach 1:
By arranging strain sensitive elements on a planar portion orthogonal to the axial direction, the invention enables three-axis force detection within a reduced axial thickness. The planar configuration allows multiple sensing elements to be positioned in different orientations on the same plane, providing three-axis detection capability without increasing the axial dimension of the casing.
Solution Approach 2:
The force detecting sensor is designed with a compact configuration that can detect forces in three different directions using strain sensitive elements arranged on a planar portion. This multi-functional sensor design enables three-axis force detection while maintaining a compact form factor suitable for thin electronic pens, eliminating the need for separate sensors for each axis.
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
This configuration enables the electronic pen to be thinned and miniaturized while maintaining accurate force detection capabilities, facilitating thinner and more compact designs suitable for mass production.
Implementation Method 1
The semiconductor strain gauge is a strain gauge that utilizes a piezoresistive effect in which the electric resistivity of a semiconductor changes according to stress
Implementation Method 2
The semiconductor strain gauge is a strain gauge that utilizes a piezoresistive effect in which the electric resistivity of a semiconductor changes according to stress or a piezoelectric effect in which polarization (surface charge) proportional to an applied pressure appears
Data Source
AI summary
An electronic pen includes a tubular casing, a core body having an end that protrudes from opening in the casing, a strain generating body that receives a force applied to the core body, a plurality of strain sensitive elements arranged on a planar portion of the strain generating body, a control circuit that performs control based on a signal sensed using the plurality of strain sensitive elements, and an electrical conductor that extends in the axial direction of the casing and is electrically connected to a plurality of terminals of the plurality of strain sensitive elements. The plurality of strain sensitive elements is electrically connected to the control circuit via the electrical conductor.