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Resistor Fabrication

IP.com Disclosure Number: IPCOM000093471D
Original Publication Date: 1967-Oct-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Smith, GW: AUTHOR [+2]

Abstract

Single strip or rod construction provides automation capability in the fabrication of precision resistor devices. Strip resistor 10 is laid down on flat substrate 12 shown as a printed circuit board. Substrate 12 is lapped and polished to minimize surface irregularities in the area at which the resistor is to be laid. Resistive material and a suitable binder are mixed to provide a homogeneous resistance characteristic with respect to volume. This mixture is bonded to the polished surface of substrate 12.

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Resistor Fabrication

Single strip or rod construction provides automation capability in the fabrication of precision resistor devices. Strip resistor 10 is laid down on flat substrate 12 shown as a printed circuit board. Substrate 12 is lapped and polished to minimize surface irregularities in the area at which the resistor is to be laid. Resistive material and a suitable binder are mixed to provide a homogeneous resistance characteristic with respect to volume. This mixture is bonded to the polished surface of substrate 12.

The sides and ends of the strip are controlled by masking when the material is laid down or by milling the edges afterwards. The upper surface of the resistive material is then lapped and polished to remove any surface irregularities. The strip resistor is now ready for use in a linear potentiometer or like device in conjunction with an available variable tapping element. The same linearity affords uniform accurate tapping of a resistor strip with fixed tapping elements 14.

Rod resistors 20 and 30 are similarly laid down on prismatic, cylindrical or tubular substrates. The resistors with cylindrical peripheral surfaces as shown are simplest to make and easiest to mount. Alternatively, a rod resistor 40 is made of suitable resistive material without a substrate.

The interdependent elements of a resistance network, a ladder type for example, are made from a single strip or rod. The film of resistive material is cut into the component resistance...