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MISSING SOLDER/EPOXY DETECTOR USING REFLECTIVE SENSOR FOR DISPENSING SYSTEM

IP.com Disclosure Number: IPCOM000009036D
Original Publication Date: 1999-Jan-01
Included in the Prior Art Database: 2002-Aug-02
Document File: 2 page(s) / 84K

Publishing Venue

Motorola

Related People

Azman Mohamed: AUTHOR

Abstract

This paper presents a method of detecting the presence of a solder paste deposit by a solder paste deposit dispensing machine using a reflective sen- sor. An advantage of this method is that it can also be used with dispensing needles that have a foot, unlike conductive or capacitive methods. Also with this method each solder paste deposit can be checked in accordance with a software program.

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MOTOROLA Technical Developments

MISSING SOLDER/EPOXY DETECTOR USING ~REFLE~TIVE SENSOR FOR DISPENSING SYSTEM

by Azman Mohamed

  This paper presents a method of detecting the presence of a solder paste deposit by a solder paste deposit dispensing machine using a reflective sen- sor. An advantage of this method is that it can also be used with dispensing needles that have a foot, unlike conductive or capacitive methods. Also with this method each solder paste deposit can be checked in accordance with a software program.

  In Figure 1, a solder deposit dispensing head has a reflective sensor integrally mounted thereto. The dispensing head moves a solder deposit dispensing needle to a dispensing location. After dispensing a solder deposit, the sensor is moved to the dispensing location to check for the presence of the solder deposit.

  In Figure 2, light is directed at the solder deposit and is reflected at various angles and some of the light is absorbed by the solder deposit. The sensor detects the light from the dispensing location and provides an output signal to a sensor amplifier which, in turn, provides either a logic 1 or 0 signal to a logic controller. When the solder deposit is missing from the dispensing location, the sensor detects a high level of reflected light and the output signal of the sensor amplifier is logic 1, indicating

the solder deposit was not detected. The logic con- troller will then cause the dispenser to stop and an alarm to sound. When th...