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Laser beam scanning by rotary mirrors. II. Conic-section scan patterns.

|November 10, 2010

Summary

This study applies scanning theory to galvanometer, paddle, and polygon scanners. It analyzes scan patterns like circles and ellipses, considering factors such as input offset and curved surfaces.

Area of Science:

Optical Engineering
Mechanical Engineering
Physics

Background:

Part I established a general theory for optical scanners.
Understanding scanner performance is crucial for various imaging applications.

Purpose of the Study:

To apply the general theory to specific scanner types: galvanometer-based, paddle, and regular polygon scanners.
To analyze the resulting scan patterns and their characteristics.
To investigate special topics including input offset and scanning on curved surfaces.

Main Methods:

Application of theoretical framework from Part I.
Analysis of scan field geometry, approximating a circular cone.
Examination of conic sections (circle, ellipse, parabola, hyperbola) as scan patterns.

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Investigating specific parameters like input offset and scan center locus.

Main Results:

The scan field for these scanners approximates a circular cone.
Scan patterns on an observation plane can form circles, ellipses, parabolas, or hyperbolas.
Effects of input offset and the locus of the instantaneous scan center were analyzed.
Generalization of the scan-field expression was developed.

Conclusions:

The study provides a comprehensive analysis of galvanometer, paddle, and polygon scanners based on general scanning theory.
Understanding the conic section scan patterns is essential for predicting scanner performance.
Further research will explore X-Y scanning in Part III.