Browse Prior Art Database

SOLDERLESS TRIMMER CAPACITOR

IP.com Disclosure Number: IPCOM000006000D
Original Publication Date: 1990-Oct-01
Included in the Prior Art Database: 2001-Nov-23
Document File: 2 page(s) / 88K

Publishing Venue

Motorola

Related People

Andy Cowdery: AUTHOR

Abstract

The solderless trimmer capacitor is similar to a standard trimmer capacitor but is attached without solder to the circuit board.

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Technical Developments Volume 11 October 1990 SOLDERLESS TRIMMER CAPACITOR

by Andy Cowdery

ABSTRACT

The solderless trimmer capacitor is similar to a standard trimmer capacitor but is attached without solder to the circuit board.

BENEFITS

-The lack of solder joints offers a reduction in opportunities for a defect. -The solderless trimmer capacitor will be more ewnomical than a standard component because of the lack of a lead frame and outer case.
- The tuning range may be easily varied by altering the size of the land on land on the circuit board.
- The solderless trimmer capacitor will have a lower profile as compared to a standard component of similar capacitance range.

DESCRIPTION

   The circuit board has a printed land on the surface to act as one or two plates of the capacitor. This plate may vary in size to yield a change in the capacitance tuning window. The hole through the board may or may not be plated but if plated must not be in touch (continuity) with the capacitance plate on the surface of the board. The driver shaft is inserted into the hole of the board and the rotor is permanently affixed to one end of the shaft. One or bdh ends of the shaft may have a slot to accommodate tuning. There is a groove about the end of the shaft to which the snap ring is assembled. The rotor is a ceramic washer on which a semicircular metallic land acts as the second plate of the capacitor. The rotor is rigidly and electrically attached to the shaft and turns as...