专利名称：Lar-trimmed resistor 发明人：Kenneth Roger Bube
申请号：US05/543622
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公开号：US03947801Ae p
公开日：
19760330
专利内容由知识产权出版社提供
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摘要：A lar-trimmed film resistor wherein the lar kerf terminates in an area outside the electrical current path across the resistor.
< P> FIELD OF THE INVENTION
This invention relates to film resistors. More particularly, this invention relates to lar- trimmed thin and thick film resistors containing a lar kerf which terminates outside the electrical current path across the resistor.< P>
BACKGROUND OF THE INVENTION
< P>Film resistors are commonly ud in hybrid circuits and include thick film resistors which are conventionally formed by screen-printing a resistive material on an insulating substrate and then firing the material, and thin film resistors which are conventionally formed by sputtering or vacuum- depositing a resistive material on an insulating substrate.
< P>In hybrid circuits it is often necessary to adjust the resistance of the film resistors in the circuit. To increa the resistance of a film resistor the resistor is "trimmed" by forming a kerf, i.e., a cut or ditch, across the electrical current path in the resistor to make the effective width of the resistor smaller and thereby increa the resistance. The kerf
may be formed by mechanical abrasion, chemical etching, or lar vaporization of the resistor material. The advantages of lar-trimming over mechanical- or chemical-trimming include very high production rates, greater flexibility in functional trimming, and tighter tolerances.如何画彩妆
The greatest disadvantage of lar-trimmed resistors with conventional kerf configurations (which will be described hereinafter) is that they exhibit appreciably greater drift, i.e., change in resistance per unit time or temperature, than mechanically- or chemically-trimmed resistors. Conquently, the inherent advantages of lar-trimming can be outweighed by the undesirable drift characteristics of the lar-trimmed resistor. Therefore, it is important to develop lar-trimmed resistors with low resistor drift.
SUMMARY OF THE INVENTION
< P>I have discovered that directing the terminus of a lar kerf in a lar-trimmed film resistor into an area outside the electrical current path across the resistor results in less resistor drift.
申请人：RCA CORPORATION
代理人：Glenn H. Bruestle,Donald S. Cohen
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