Electronic Ink Cartridge With Pressure Sensor For Position Pointer
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Solution Overview
Problem
Conventional position pointers face challenges in mass production due to complex assembly requirements, susceptibility to positional displacement of components, and difficulty in miniaturization, leading to unreliable pressure detection characteristics and low productivity.
Innovation Solution
The introduction of an electronic ink cartridge that encapsulates the core member and pressure sensor within a tubular member, with a connection member locking the pressure sensor in place, allowing for stable and reliable pressure sensing and easy integration into a housing, facilitating mass production and miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional position pointers use multiple separate components (core member, ferrite chip, O-snap ring, coil, printed board, board holder, cap), then pressure detection function can be achieved, but assembly complexity increases and manufacturing productivity decreases
Solution Approach 1:
The patent combines the core member, pressure sensor, and electronic ink cartridge into an integrated electronic ink cartridge assembly. This merging of previously separate components simplifies the overall structure, reduces the number of parts, and enables easier mass production while maintaining pressure detection functionality through the integrated design.
Solution Approach 2:
The electronic ink cartridge serves multiple functions: it acts as both the housing for the pressure sensing mechanism and the functional pressure sensor itself. The tubular member provides structural support while the integrated pressure sensor within it performs pressure detection, eliminating the need for separate structural and sensing components.
2Ease of manufacture
If multiple components are assembled in housing, then pressure sensor can be integrated, but positional displacement of components occurs leading to unreliable characteristics
Solution Approach 1:
By merging the pressure sensor with the core member and electronic ink cartridge into a single integrated assembly, the patent eliminates the need for precise positioning of multiple separate components during assembly. The integrated design ensures fixed relative positions, preventing positional displacement and maintaining manufacturing precision.
3Device complexity
If conventional assembly methods are used, then components can be accommodated, but device size cannot be minimized
Solution Approach 1:
The patent implements a nested structure where the pressure sensor is positioned within the tubular member of the electronic ink cartridge, and the core member extends through the assembly. This nesting of components within each other reduces the overall volume and enables miniaturization of the position pointer while maintaining all necessary functional elements.
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 enhances the reliability of pressure sensing, simplifies assembly, and enables the production of thinner, more reliable position pointers with improved productivity.
Implementation Method 1
pressure sensors of various sensing types are available including those of a type wherein pressure applied to the core member is sensed as a variation of the inductance, and those of another type wherein pressure applied to the core member is sensed as a variation of the capacitance
Implementation Method 2
pressure applied to a core member is sensed as a variation of the inductance
Data Source
AI summary
An electronic ink cartridge is provided, which improves the mass productivity of a position pointer and which ensures reliability of a characteristic of a pressure sensor to detect writing pressure. The electronic ink cartridge includes a core member provided so as to extend outwardly from a distal end portion of a tubular member in a direction of a center axis of the tubular member, a pressure sensor accommodated in a hollow portion of the tubular member to sense pressure applied to the core member, a connection member provided fixedly on the tubular member to interpose the pressure sensor between the connection member and the core member along the direction of the center axis of the tubular member, and a connection terminal, which is formed on a proximal end face of the connection member and from which an electric characteristic corresponding to the pressure sensed by the pressure sensor is extracted.