Browse Prior Art Database

MEANS OF IMPLEMENTING ASYNCHRONOUS RIS/ROS IN A XEROGRAPHIC COPIER/INPUT-OUTPUT TERMINAL

IP.com Disclosure Number: IPCOM000024609D
Original Publication Date: 1981-Apr-30
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 111K

Publishing Venue

Xerox Disclosure Journal

Abstract

The concept of adding a raster input scanning function to a machine already possessing dual function capability; i.e., an optical copying system and a raster output scanner, is of interest, particularly for use in a communications network system.

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XEROX DISCLOSURE JOURNAL

MEANS OF IMPLEMENTING ASYNCHRO- NOUS RIS/ROS IN A XEROGRAPHIC COPIER/INPUT-OUTPUT TERMINAL Martin E. Bant'on

Proposed Classification
U.S. CI. 358/288 Int. C1. H04n 1/17

The concept of adding a raster input scanning function to a machine already possessing dual function capability; i.e., an optical copying system and a raster output scanner, is of interest, particularly for use in a communications network system.

In such a system, a variety of machines are typically connected to a single coaxial cable with provision made to permit only one machine to send information over the network at a time. Data is transmitted over the network in packets. On the scale of a digitized 8.5" by 14" page (20 million bits at 480 lpi), the packets are small to minimize time lost to transmission errors and to facilitate real-time sharing of the network. However, where multiple machines are utilizing the line, it could require over a minute to transmit a document which could not match the process speed of typical present day copiers. This means that one must either: 1) provide buffer memories at both sender and receiver or 2) operate sender and receiver asynchro- nously; i.e., not at a constant process speed. To provide memories would substantially increase cost. Due to the high cost penalty of providing large buffer memories, it is desirable instead to utilize the asynchronous capability.

Volume 6 Number 2 March/April 1981 93

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MEANS OF IMPLEMENTING ASYNCHRONOUS RIS/ROS IN A XEROGRAPHIC COPIER/INPUT-OUTPUT TERMINAL (Cont'd)

Referring to the Figure, a simplified representation of a raster output scanner is there shown as applied to a copier 5 having a moving photoreceptor 6. A movable deflector 7 provides the X-direction motion of the beam 8 from laser 10 (in the fast scan direction) while movement of the photoreceptor 6 provid...