Browse Prior Art Database

Precision Resist Or Manufacturing

IP.com Disclosure Number: IPCOM000096930D
Original Publication Date: 1962-Feb-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Hubacher, EM: AUTHOR

Abstract

This apparatus for manufacturing precision resistors reduces tailoring time, lowers resistor tolerances and eliminates potential hot spots in resistors after fabrication.

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Precision Resist Or Manufacturing

This apparatus for manufacturing precision resistors reduces tailoring time, lowers resistor tolerances and eliminates potential hot spots in resistors after fabrication.

The apparatus is arranged for assembly line operation. Coarse and fine sandblast nozzles abrade a resistor to a particular value, while the resistance value is measured on a bridge or like apparatus. The resistors are silk screened alloys applied to a substrate 20. This apparatus, however, is suitable for other two-dimensional resistors.

The individual resistors are placed on an assembly line, not shown, and successively pass beneath the coarse and fine nozzles. Attached to each resistor are electrodes 22 and 24. These contact a resistance sensing servomechanism
26. This controls the length of operation for the coarse and fine nozzles. The two nozzles differ in size and shape, one being rectangular, the other is annular. Each nozzle connects through a separate solenoid cutoff which regulates the emission of sand through the nozzle. The resistor bridge or other device measures the value of the resistor while tailoring occurs.

When the resistor value is 4% or 5% above the final tailoring value, the servomechanism turns off the coarse nozzle. The fine sandblast nozzle, however, continues to operate until the resistor is tailored to the final value. When the final resistor value is reached, the fine nozzle turns off and the tailoring is complete.

Use of coarse and f...