# Optics : Polygonal mirrors

1. Jul 1, 2009

### anita1984

Hello Forum , i have a Polygonal mirror with 6 facets of mirrors , i am working in a project for a scan system without lens . I would like to ask you about a document or books to find the formulas of : Scan Angle,The distance between the polygon and the scan plane in a system without a scan lens,The total length of the scan line in the scan plane.
Moreover, he notes that becasue the rotation axis does not pass through a surface, the scanned beam translates as well as pivots during a line. So-called f-$$\theta$$ lenses are used to convert constant angular velocity scans to constant linear velocity scans by use of distortion.