Variable resistance device having a resistance element with lase

Details Variable resistance device having a resistance element with lase Variable resistance device having a resistance element with lase

1980-09-12

1982-08-17

Albritton, C. L.

Electrical resistors

Mechanically variable

Movable contact electrically adjustable over length of...

29620, 338180, 338195, 338202, H01C 1038

Patent

active

043452353

ABSTRACT:
An electrical resistance element for a variable resistance device, such as a thick film resistance element, and a method of making the element and a device utilizing the element, such as a potentiometer, is described. The resistance element comprises a single resistance material for use as a resistance path for a contact wiper in a variable resistance device and has a selected series of generally transverse cuts made in at least one section of the resistance material of the element. The cut section(s) provides an increased current path length through the element whereby the total resistance of the element is increased. Also, the cut section(s) provides the resistance element with a resistance function which can be adjusted to vary over a wide range of resistance values depending on the length, width, and number of the cuts.

REFERENCES:
patent: 3379567 (1968-04-01), Wright
patent: 3601744 (1971-08-01), Zandman
patent: 4032881 (1977-06-01), Singleton
patent: 4051453 (1977-09-01), Barden
patent: 4150366 (1979-04-01), Price
patent: 4159461 (1979-06-01), Kost et al.
patent: 4197521 (1980-04-01), Rovynyak
patent: 4205296 (1980-05-01), Frey, Jr.
patent: 4243969 (1981-01-01), Steigerwald
patent: 4274074 (1981-06-01), Sakamoto
An Introduction to Laser Trimming, "Laser Trim System--An Overview", Chicago Laser Systems, Inc., Approx. 8/79.
Pertinent Pages of Chicago Laser Systems, Inc., Sales Brochure entitled "An Introduction to Laser Trimming".

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