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Browse Prior Art Database

IMPROVED MOTOR POLYGON ASSEMBLY

IP.com Disclosure Number: IPCOM000026179D
Original Publication Date: 1990-Oct-31
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 64K

Publishing Venue

Xerox Disclosure Journal

Abstract

In an Image Output Terminal (IOT) Raster Output Scanner (ROS) there are three problems that plague the ROS. They are: (1) high temperature of the motor assembly, (2) contamination of the polygon facets, (3) noisy operation of the motor polygon assembly.

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XEROX DISCLOSURE JOURNAL

IMPROVED MOTOR POLYGON Proposed Classification ASSEMBLY US. C1.355/006.7 Robert E. Hewitt Int. C1. G02b 26/08

In an Image Output Terminal (IOT) Raster Output Scanner (ROS) there are three problems that plague the ROS. They are: (1) high temperature of the motor assembly, (2) contamination of the polygon facets, (3) noisy operation of the motor polygon assembly.

A solution to these problems exists if the polygon and its bearings were isolated in an evacuation chamber and magnetically coupled to the motor shaft through one of the walls of the evacuation chamber. The operation of the polygon in a vacuum would solve the problems in the following ways. First, running the polygon at 22,500 RPM in air at standard atmospheric pressure creates a very high aerodynamic drag which must be overcome by the polygon motor. In a vacuum, the aerodynamic drag is reduced to zero and the only work which the motor must do is to overcome the friction of -he bearings. Thus, the power input to the motor can be reduced significaitly and the operating temperature of the motor will be reduced. Secondly, contamination of the facets is caused by airborn dirt in the vicinity of the polygon. In a vacuum there is no air to act as the transporter of the contamination. And thirdly, one of the major contributions to the noise of the ROS is the whirring noise of the polygon spinning. Running in a vacuum will eliminate all the noise due to the polygon.

XEROX DISCLOSURE JOURNA...