Browse Prior Art Database

Polygon Scanner

IP.com Disclosure Number: IPCOM000036773D
Original Publication Date: 1989-Oct-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 2 page(s) / 69K

Publishing Venue

IBM

Related People

Nard, ME: AUTHOR

Abstract

The scanner assembly shown in the figure was designed to provide precise rotation of a polygon mirror at speeds between 18,000 and 36,000 rpm for high resolution electrophotographic laser printers. The rotor is a cylinder 1 with a plug in one end. The rotor fits over a fixed central shaft 2. The rotor is supported in the radial direction by spiral groove hydrodynamic air bearings 3. The rotor is supported in the axial direction by repulsion forces from two pairs of permanent magnets 4. The polygon mirror 5 is mounted to a flange on the rotor and is tapered to reduce aerodynamic drag. The rotor is driven by an integral brushless DC motor 6. Advantages of this scanner design include low acoustic noise, low vibration levels, long life, and no lubricant contamination of optical surfaces.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Polygon Scanner

The scanner assembly shown in the figure was designed to provide precise rotation of a polygon mirror at speeds between 18,000 and 36,000 rpm for high resolution electrophotographic laser printers. The rotor is a cylinder 1 with a plug in one end. The rotor fits over a fixed central shaft 2. The rotor is supported in the radial direction by spiral groove hydrodynamic air bearings 3. The rotor is supported in the axial direction by repulsion forces from two pairs of permanent magnets 4. The polygon mirror 5 is mounted to a flange on the rotor and is tapered to reduce aerodynamic drag. The rotor is driven by an integral brushless DC motor 6. Advantages of this scanner design include low acoustic noise, low vibration levels, long life, and no lubricant contamination of optical surfaces.

1

Page 2 of 2

2

[This page contains 6 pictures or other non-text objects]