Browse Prior Art Database

ENHANCED CONTACT PIN

IP.com Disclosure Number: IPCOM000006400D
Original Publication Date: 1992-May-01
Included in the Prior Art Database: 2001-Dec-31
Document File: 1 page(s) / 54K

Publishing Venue

Motorola

Related People

Allen L. Christenson: AUTHOR [+2]

Abstract

Some Motorola portable radio accessories currently use a small flex circuit in the accessory connector. This flex circuit provides an interface from the accessory cable conductor wires to the contact pins located in the connector block; RF chokes are usually mounted on this flex to reduce EM1 effects on the radio. See Figure 1 below. The hand soldering processes of connecting the cable's wires to the flex, installiig sur- face mount RF chokes, and attaching the flex to the contact pins makes assembly of the connector very labor intensive. The proposed enhanced contact pin simplifies the interfacing of the cable wires to the contact pins.

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MOTOROLA INC. Technical Developments Volume 15 May 1992

ENHANCED CONTACT PIN

by Allen L. Christenson and Henry A. Bogut

  Some Motorola portable radio accessories currently use a small flex circuit in the accessory connector. This flex circuit provides an interface from the accessory cable conductor wires to the contact pins located in the connector block; RF chokes are usually mounted on this flex to reduce EM1 effects on the radio. See Figure 1 below. The hand soldering processes of connecting the cable's wires to the flex, installiig sur- face mount RF chokes, and attaching the flex to the contact pins makes assembly of the connector very labor intensive. The proposed enhanced contact pin simplifies the interfacing of the cable wires to the contact pins.

  The enhanced contact pin design utilizes a metallic, hollow, cylindrical pin with the spring loaded contact in the lower portion and incorporates a "drop in" RF choke in the upper portion of the pin. The choke is insulated from the cylinder walls by a nonconductive sleeve, and the choke and sleeve are retained inside the pin by a press on insula- tion displacing connector (IDC) cap. See Figure 2. The press together assembly of the contact pin and IDC con- nection make the wire-to-pin interfacing a solderless, simpler, less expensive process. An additional feature of the design is that the cylindrical geometry of the pin pro- vides an inherent capacitance which combines with the RF choke's inductance to form a lo...