Rotating Prism Beam Scanner for Laser Skin Treatment
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Solution Overview
Problem
Existing devices face challenges in scanning large surface areas efficiently for laser-induced optical breakdown (LIOB) treatments, leading to high treatment times due to difficulties in achieving high scan speeds without mechanical vibrations and ineffective use of laser capabilities.
Innovation Solution
A device with a rotating optical system that scans the laser beam along a curved path, avoiding sharp turns and linear movement reversals, allowing for increased scan speeds while maintaining control and reducing vibrations, and incorporating adjustable lenses for aberration compensation and focus depth control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If linear scanning with sharp turns and reversals is used, then the scanning system is simple to implement, but mechanical vibrations increase and scan speed is limited
Solution Approach 1:
The patent applies curved scanning paths (circular or arc trajectories) instead of linear scanning with sharp turns. The beam scanner rotates the focused beam along a curved path, eliminating abrupt direction changes and reversals. This curvature principle reduces mechanical vibrations and allows higher scan speeds while maintaining beam control precision.
2Productivity
If high scan speeds are achieved with linear scanning, then treatment time is reduced, but mechanical vibrations and loss of control increase
Solution Approach 1:
The curved scanning path eliminates sharp turns and reversals that cause vibrations and control loss at high speeds. The continuous rotational motion along a circle or arc provides smooth beam delivery, maintaining stability and reliability even at increased scan speeds, thereby improving treatment efficiency without sacrificing control.
3Area of stationary object
If the focusing system is stationary, then the optical system is simpler, but large surface areas cannot be scanned efficiently
Solution Approach 1:
The patent introduces a beam scanner that dynamically rotates the focused beam along a curved path, enabling the stationary focusing system to cover large surface areas. The dynamic scanning mechanism allows efficient treatment of extensive regions without requiring physical movement of the entire optical system, balancing coverage capability with system simplicity.
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 efficient scanning of large surface areas at high speeds with reduced vibrations and improved control, resulting in faster treatment times and effective LIOB treatments for skin rejuvenation and hair removal.
Implementation Method 1
the power and pulse duration of the laser and the dimension of the focal spot are selected such that a laser induced optical breakdown (LIOB) phenomenon affects the skin
Implementation Method 2
when the power density (W/cm2) of the laser beam in the focal spot exceeds a threshold value which is characteristic for the particular medium... Above the threshold value, the medium has strongly non-linear absorption properties for the particular wavelength of the laser beam, which are the result of ionization of the medium and the formation of plasma
Implementation Method 3
a focusing system for focusing the incident light beam of the light source in a focal spot located outside the device
Data Source
AI summary
A pulsed laser skin treatment device is for laser induced optical breakdown of hair or skin tissue. A beam scanning system scans the beam to define a circular or arc path, using a rotated prism which implements a lateral shift to the beam. A focusing system at the output side of the beam scanning system focuses the incident light beam into a focal spot in the hair or skin tissue, and it rotates with the prism.