Micro Needle Driving Device Cam Mechanism Noise Reduction
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Solution Overview
Problem
Existing micro needle driving devices are complex, prone to noise, and have durability issues due to their intricate structures and high component tolerances, which affect precision and longevity.
Innovation Solution
A micro needle driving device with a simple structure featuring a rotating unit and a moving cam unit that linearly moves the micro needle part on the same axis as the rotary shaft of the driving motor, eliminating the need for complex linkages and reducing noise and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an eccentric structure or spring structure with driving motor and link is used to automatically reciprocally move the micro needle, then the micro needle can be driven reciprocally, but the device has a large number of components, deteriorates precision due to tolerances, and generates much noise
Solution Approach 1:
The patent extracts and eliminates the unnecessary link components from the traditional eccentric mechanism. By using a cam mechanism where the cam profile itself directly guides the reciprocating motion, the intermediate links are removed, reducing component count while maintaining automatic reciprocation functionality
Solution Approach 2:
Instead of using an eccentric mechanism that converts rotation to reciprocation through multiple links, the patent inverts the approach by using a cam mechanism where the rotating cam profile directly dictates the reciprocating motion path, fundamentally changing the mechanical transmission approach
2Ease of operation
If an eccentric structure with links is used to convert rotations into reciprocations, then the micro needle can be driven, but the device generates much noise
Solution Approach 1:
By removing the intermediate links from the mechanical transmission chain, the patent eliminates the multiple contact points and joints that generate noise. The direct cam-follower contact reduces vibration and noise while maintaining the rotation-to-reciprocation conversion function
3Productivity
If the inclined plate repeatedly reciprocates at high speed, then the micro needle can be driven efficiently, but the spring structure deteriorates durability and restoring force
Solution Approach 1:
The patent removes the spring component from the high-speed reciprocating mechanism. By using a cam mechanism where the cam profile directly controls the motion, the system eliminates the spring's repeated compression and expansion cycles, thereby preventing fatigue and durability issues while maintaining high-speed operation
Solution Approach 2:
Instead of relying on spring elasticity to drive reciprocation, the patent inverts the approach by using a rigid cam profile that passively guides the follower through the reciprocating path, eliminating the need for elastic energy storage and release that causes spring deterioration
4Ease of operation
If a complex linkage structure is used to drive the micro needle, then the device can function, but it deteriorates precision due to tolerances between components
Solution Approach 1:
By extracting the intermediate links from the mechanism, the patent reduces the number of component interfaces where tolerances can accumulate. The direct cam-follower connection minimizes tolerance stacking, thereby improving control precision while maintaining mechanical drive functionality
Solution Approach 2:
The patent inverts the traditional approach by using a cam mechanism where the motion is defined by the cam profile geometry rather than by linkage dimensions. This shifts the precision requirement from multiple component fits to a single cam profile, improving overall control precision
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 design enables precise control, reduces noise, improves durability, and stabilizes operation by minimizing component errors and wear, making the device more economical and efficient.
Implementation Method 1
a guide boss on an outer peripheral surface of the rotating unit... to which the guide boss is slidably connected
Implementation Method 2
a moving cam unit to which the micro needle part is coupled on one side thereof and in which the rotating unit is accommodated, which has a guide which has a shape that is curved along a lengthwise direction
Data Source
AI summary
A micro needle driving device comprises: a main body having a receiving space formed therein; a drive motor provided in the receiving space; a rotating unit axially coupled to and rotating with the rotating shaft of the drive motor and having a guide projection formed on an outer peripheral side surface thereof; and a moving cam unit having the micro needle unit coupled to a side thereof and the rotating unit received therein, having a guide portion formed in a curved line along a lengthwise direction on an inner peripheral side surface thereof, and reciprocally and linearly moved according to the rotation of the rotating unit. The guide portion has the guide projection connected thereto in a slidably movable manner.