Browse Prior Art Database

NON-CONTACT TEMPERATURE SENSOR

IP.com Disclosure Number: IPCOM000023849D
Original Publication Date: 1979-Feb-28
Included in the Prior Art Database: 2004-Apr-01
Document File: 2 page(s) / 222K

Publishing Venue

Xerox Disclosure Journal

Abstract

In many applications, it is desirable to have a temperature-sensing device wherein the actual temperature measuring apparatus is not in contact with the material being heated or cooled. For example, in some xerographic copy machines, it is desirable to bring the photoreceptor to a certain temperature level to assure

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 83% of the total text.

Page 1 of 2

XEROX DISCLOSURE JOURNAL

NON-CONTACT TEMPERATURE SENSOR Proposed Classification

U.S. CL 355/30R

mt. CL G03g 15/00

In many applications, it is desirable to have a temperature-sensing device wherein

the actual temperature measuring apparatus is not in contact with the material being heated or cooled. For example, in some xerographic copy machines, it is desirable to bring the photoreceptor to a certain temperature level to assure

optimum copy quality from the photoreceptor. The photoreceptor may be heated by directing a stream of warm air through the interior of the photoreceptor drum.

To accurately measure the temperature of the rotating drum, a patch of material may be provided on the inside surface of the drum which will change its reflectance

or opacity under the influence of heat, such as a liquid crystal or other similar temperature marking stick. A thermostatic bi-metalic strip coul& also be used

since temperature would cause movement of the strip which would change the position of the strip surface as the temperature changed. By shining a beam of

light at the material and sensing its reflectance, a determination of the desired temperature can be obtained (he., by a reflectance or non-reflectance signal). A more sophisticated system could include several temperature chemical sensors, each for a different temperature range with all sensors being photoelectrically scanned. This would either expand the range of temperatures controlled or allow for a variable te...