LAYER RESISTANCE UNIT FOR VOLTAGE DIVIDERS

• US 3,602,867 A
• Filed: 11/26/1968
• Issued: 08/31/1971
• Est. Priority Date: 12/01/1967
• Status: Expired due to Term

• Current Assignee: Josef Kohler
• Original Assignee: Josef Kohler
• Inventors: Kohler, Josef
• Primary Examiner(s): Kozma, Thomas J.
• Application Number:
  US04/779,010
• Time in Patent Office: 1,008 Days
• Field of Search: 338/120,195,121,122,123,129,126,128,138,14L
• US Class Current: 338/120
• CPC Class Codes: H01C 10/16 including plural resistive elements
• CPC Class Codes: H01C 10/20 Contact structure or movable resistive elements being ganged
• CPC Class Codes: H01C 10/22 resistive element dimensions changing gradually in one direction, e.g. tapered resistive element H01C10/04 takes precedence
• CPC Class Codes: H01C 10/48 including contact movable in an arcuate path
• CPC Class Codes: H01C 17/22 adapted for trimming

Abstract

A layer resistance unit for voltage dividers adapted particularly for tuning or adjusting high frequency circuits capacitance diodes, said unit comprising series-connected main resistance elements at least some of which are connected in parallel with a side resistor and the latter being adapted to be varied so as to adjust the resistivity of the resistance unit to a desired characteristic, said main resistance elements and said side resistors being interconnected by conducting transverse or cross strips of conducting material. Said side resistors are adapted to have their resistance varied by progressively reducing the width of their current conductive layer surface. At least one main resistor having in addition to its side resistor connected to it in parallel a further layer resistance, all resistance layers of the unit i.e. main resistors, side resistors and parallel resistors having the same specific surface resistivity.

Claims

1. In a layer resistance unit for nonlinear ohmic voltage dividers, in which the divisional voltage is picked up by a wiper moving across a layer track, a. a wiper, b. a plurality of series connected main resistors, of layer construction and in tandem relationship, positioned on an insulating base, said main resistors being of nonuniform width, said wiper movable across said main resistors, c. at least one side resistor, of layer construction, connected in parallel with each said main resistor, said side resistors having severing lines to thereby admit of the removal of portions with consequent increase in electrical resistance thereof, d. a conducting cross-strip between each of the said main resistors and extending across and contacting the entire width of said main resistors except for an interruption at its intersection with the path of travel with said wiper, layer resistance material extending through said interruption, said side resistors connected between adjacent cross-strips to effect said parallel connection, e. the length of the cross-strips being greater than the width of the main or side resistors.

2. The layer resistance unit of claim 1 wherein the width of the cross-strips is smallest adjacent their intersection with the path of travel of said wiper.

3. The layer resistance element of claim 1 wherein at least one of said main resistors has, in addition to its side resistance, connected in parallel a further layer resistance.

4. The layer resistance of claim 1 wherein the said side resistors are comprised of material having the same specific surface resistivity as said main resistors.

5. The layer resistance unit of claim 1 wherein said severing lines are straight lines.

6. The layer resistance unit of claim 1 wherein said severing lines are segments of a circle.

7. The layer resistance unit of claim 1 wherein said main resistors are shaped as annular segments.

8. The layer resistance unit of claim 1 including a second wiper, independently adjustable of said first wiper on said main resistors.