Electronic Pen Rotating Body Movement Detection
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Solution Overview
Problem
Existing electronic pens struggle to detect the position of a pen tip on surfaces with black color or no surface unevenness, as the light-receiving section cannot receive reflected light, leading to undetectable pen tip movement.
Innovation Solution
An electronic pen design featuring a rotating body with a light source, first and second detection members, and a control unit that uses a branching light system to detect movement of both the rotating body and the object, ensuring continuous detection even when one is not in contact, by employing a diffraction element and photoreceptor arrays to analyze speckle patterns for movement and direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a light-receiving section is used to detect pen tip position by receiving reflected light, then position detection is enabled, but detection fails on black surfaces or surfaces with no unevenness where reflected light cannot be received
Solution Approach 1:
The detection system is segmented into two independent detection paths: one using a light-receiving section to detect reflected light patterns, and another using a rotation detection section to detect rotating body movement. Each path can operate independently or complementarily, ensuring detection reliability across different surface types.
Solution Approach 2:
A rotating body is introduced as an intermediary element between the pen tip and the detection system. The rotating body converts pen tip movement into rotational motion, which can be detected independently of surface optical properties, thereby mediating the detection process for surfaces that do not reflect light properly.
2Device complexity
If a single detection method is used, then device complexity is reduced, but detection capability is lost on surfaces where the detection method fails
Solution Approach 1:
The detection system is designed with multi-functionality by incorporating both a light-receiving section for optical detection and a rotation detection section for mechanical detection. This universal detection capability allows the system to adapt to different surface types (light-reflecting and non-reflecting surfaces) without requiring separate devices.
Solution Approach 2:
The system dynamically switches between or combines two detection methods based on surface conditions. The control unit can select which detection result to prioritize or combine both results, making the detection system flexible and adaptive rather than static and single-purpose.
3Reliability
If only the rotating body movement is detected, then detection works on all surfaces, but movement of the object itself (such as the medium being written on) cannot be distinguished
Solution Approach 1:
The detection system segments the measurement into two components: rotating body movement detected by the rotation detection section, and object movement detected by the light-receiving section. By segmenting these measurements, the system can distinguish between pen tip movement (via rotation) and medium movement (via light reflection patterns), preserving both pieces of information.
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
Enables reliable detection of pen tip movement on various surfaces, preventing the pen-type input device from being undetectable, and automatically switching detection priority based on movement amounts to ensure continuous operation.
Implementation Method 1
a light source configured to emit light, wherein the first detection member includes a first photoreceptor element that receives light reflected by the rotating body
Data Source
AI summary
An electronic pen includes a rotating body rotatably supported on an object, a first detection member configured to detect movement of the rotating body, and a second detection member configured to detect movement of the object.