Electronic Pen Battery Layout for Shock-Resistant Solder Joints
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Solution Overview
Problem
Electronic pens with built-in batteries face challenges in shock resistance and stress reduction on positive and negative electrode conductors due to their slim design, particularly with lithium-ion batteries.
Innovation Solution
The electronic pen is designed with a tubular casing containing a circuit board and a columnar battery where positive and negative electrode conductors protrude from one end, forming a separation space with the circuit board, and are connected via soldered portions, allowing force distribution and shock resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the battery is made small and slim to fit the electronic pen, then the device size is reduced, but shock resistance and stress resistance of electrode conductors deteriorate
Solution Approach 1:
A cushioning member is provided between the battery and the circuit board to absorb shock forces before they reach the battery and electrode conductors. This preemptive cushioning protects the delicate components during drops or impacts while maintaining the battery's compact size for the slim electronic pen design.
2Volume of moving object
If the battery is made small and slim, then the device size is reduced, but stress on positive and negative electrode conductors increases
Solution Approach 1:
The cushioning member is positioned to protect the electrode conductors before stress is applied during impacts. It absorbs and distributes forces, preventing concentrated stress on the delicate conductors while maintaining the battery's compact dimensions.
Solution Approach 2:
The cushioning member acts as an intermediary between the battery and the external environment, mediating the transmission of shock forces. It provides a buffer zone that reduces stress on the electrode conductors while allowing the battery to maintain its small, slim form factor.
3Volume of moving object
If the battery is disposed close to the circuit board for compactness, then device size is reduced, but shock resistance deteriorates
Solution Approach 1:
Even with minimal spacing between the battery and circuit board, the cushioning member is inserted to provide shock absorption. This allows compact device design while maintaining reliability during impacts, as the cushioning member compensates for the reduced distance between components.
Data Source
AI summary
An electronic pen includes a circuit board disposed such that an axial direction of a casing is aligned with a longitudinal direction of the circuit board, an electronic circuit on the circuit board, and a battery having a columnar shape disposed on a side of the circuit board opposite to a pen tip side of the circuit board inside a hollow portion of the casing such that positive and negative electrode conductors protruding from an end surface of the battery extend toward the circuit board. The battery is disposed such that a separation space is formed between the end surface and an end portion of the circuit board and such that tip portions of the positive and negative electrode conductors are in contact with the circuit board. The circuit board and the tip portions of the positive and negative electrode conductors are electrically connected to each other by soldered portions.