Browse Prior Art Database

SONIC VELOCITY MEASUREMENT

IP.com Disclosure Number: IPCOM000025223D
Original Publication Date: 1984-Feb-29
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 47K

Publishing Venue

Xerox Disclosure Journal

Abstract

In the scanning optics of a photocopier, either the document platen moves through a scanning zone or the carriage-mounted optics is adapted to scan in a parallel path beneath the platen. It is desirable in such systems to measure the velocity of the platen or carriage. The figure shows one method of measuring a platen velocity during a scan cycle.

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

XEROX DISCLOSURE JOURNAL

SONIC VELOCITY MEASUREMENT Proposed Classification John C. Townsend U.S. C1. 355/8

Int. C1. G03g 15/28

//O /4

In the scanning optics of a photocopier, either the document platen moves through a scanning zone or the carriage-mounted optics is adapted to scan in a parallel path beneath the platen. It is desirable in such systems to measure the velocity of the platen or carriage. The figure shows one method of measuring a platen velocity during a scan cycle.

As shown, document platen 10 is adapted for movement in the direction shown. A sonic transmitter 12 and microphone 14 are used to measure platen velocity making use of the acoustic doppler effect. Transmitter 12, attached to the end of the platen, is a lightweight piezoelectric crystal set which produces a pure tone at a fixed frequency above the human audible range. Microphone 14 is positioned in the scan direction to receive this tone. An output signal from the microphone can then be amplified and conditioned and used in a feedback control system.

Volume 9 Number 1 January/February 1984 57

[This page contains 1 picture or other non-text object]

Page 2 of 2

    XEROX DISCLOSURE JOURNAL Volume 9 Number 1 January/February 1984

[This page contains 1 picture or other non-text object]