Laser Engraving Focus Lens Positioning With Magnetic Scale Feedback
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Solution Overview
Problem
Existing laser engraving devices face precision issues due to errors in the transmission mechanism, such as backlash in belts, affecting the accuracy of movement.
Innovation Solution
A precision-enhanced laser engraving device is developed, incorporating a magnetic scale and a reader to provide an instantaneous position signal for the focusing lens set, eliminating errors from the driver mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a transmission element (such as a belt) is used to transmit motion from the motor to the focusing lens set, then the device structure is simplified and easier to manufacture, but transmission errors (such as backlash) occur that reduce positioning precision
Solution Approach 1:
The patent replaces the mechanical transmission system (motor → transmission element → focusing lens set) with a direct measurement system. The magnetic scale and reader directly measure the position of the focusing lens set without relying on transmission elements, thereby eliminating backlash and other transmission errors while maintaining relatively simple device structure
Solution Approach 2:
The patent introduces a magnetic scale as an intermediary measurement medium between the focusing lens set and the reader. The magnetic scale provides a reference for position measurement, allowing the reader to accurately determine the position of the focusing lens set without mechanical transmission, thus resolving the contradiction between simplicity and precision
2Manufacturing precision
If the position is determined by counting motor rotations, then the device structure remains simple, but transmission errors (such as belt backlash) cause positioning inaccuracies
Solution Approach 1:
The patent replaces the indirect mechanical position determination method (counting motor rotations) with a direct measurement method using magnetic scale and reader. This directly measures the actual position of the focusing lens set, eliminating errors from transmission elements and providing reliable position signals
Solution Approach 2:
The patent implements a feedback mechanism where the reader continuously reads the magnetic scale to provide real-time position information of the focusing lens set. This feedback ensures accurate position control by directly monitoring the actual position rather than relying on theoretical motor rotation counts
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 solution ensures precise movement of the laser engraving device by directly acquiring the instantaneous position signal, thereby eliminating transmission errors and enhancing overall precision.
Implementation Method 1
a magnetic scale, which is arranged in the axial direction and is provided with graduations
Implementation Method 2
a reader, which is arranged on the focusing lens set and reads the graduations of the magnetic scale to provide an instantaneous position signal
Data Source
AI summary
A precision-enhanced laser engraving device includes a working platform, which defines at least one axial direction, a laser emission port being arranged at one side of the working platform; a magnetic scale, which is arranged in the axial direction and is provided with graduations; a focusing lens set, which is movably arranged on the magnetic scale; a driver mechanism, which drives the focusing lens set to move on the magnetic scale; and a reader, which is arranged on the focusing lens set and reads the graduations of the magnetic scale to provide an instantaneous position signal. By means of a combination of the magnetic scale and the reader, the instantaneous position signal can be acquired directly from the focusing lens set to thereby eliminate an issue of errors of the driver mechanism, such as a backlash of a belt, so as to realize precise movement of a laser engraving device.