Browse Prior Art Database

INFRA-RED TEMPERATURE SENSOR

IP.com Disclosure Number: IPCOM000024750D
Original Publication Date: 1981-Dec-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 81K

Publishing Venue

Xerox Disclosure Journal

Abstract

There are some specific applications ,.1 xerographic copiers for a non-contacting temperature sensor. The most obvious is for fuser roll temperature control. A non-contact temperature sensor is described using a thinistor infra-red detector. The non-contact temperature sensor consists of the following: (1) VECO Thinistor Infra-Red Detector mounted in a 6-pin TO5 type header; (2) electronic circuit for amplification and ambient temperature compensation; and (3) plastic housing with heat shield to enclose the detector and electronics and to provide a more stable environment.

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Page 1 of 2

XEROX DISCLOSURE JOURNAL

Volume 6 Number 6 November/December 1981 359

Proposed Classification
U.S. C1. 355/3FU Int. C1. G03g 15/00

I IRD SENSOR

INFRA-RED TEMPERATURE SENSOR

Edward J. Majewicz Ralph Shoemaker

PLASTIC HCUSIF3C

I

IRD SENSOR

i

MOUNTING HOLE

'PC. BOARD

'FRONT, W/HEAT

SHIELD

FIG. 2

There are some specific applications ,.1 xerographic copiers for a non-contacting temperature sensor. The most obvious is for fuser roll temperature control. A non-contact temperature sensor is described using a thinistor infra-red detector. The non-contact temperature sensor consists of the following: (1) VECO Thinistor Infra-Red Detector mounted in a 6-pin TO5 type header; (2) electronic circuit for amplification and ambient temperature compensation; and (3) plastic housing with heat shield to enclose the detector and electronics and to provide a more stable environment.

The figure shows a temperature sensor consisting of two free standing thermistor flakes. One detects the infra-red energy of the surface being measured and the other detects the ambient temperature for compensation. The thermistor flakes are mounted in a 6-pin TO5 type header.

The TO5 header is enclosed in a cylindrical plastic housing. The front surface of the housing has a heat shield of aluminized mylar to keep the housing temperature at a minimum. In this way, the sensor detects only radiant energy. The housing also encloses electronics which amplify the signal and provides for additional temperature c...