Browse Prior Art Database

Spring Contact Z Height Scanner

IP.com Disclosure Number: IPCOM000049304D
Original Publication Date: 1982-Apr-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Jayne, JR: AUTHOR [+2]

Abstract

A traveling probe with a series of sensitive fingers built into a movable housing is provided which can travel on and in a rail system to detect the high spring contacts and their location on the printed circuit board. After the spring contacts are soldered into place and the board stiffener bonded to the board, the rails are placed on locating pads and secured. The locating pads are part of the board from which the spring contact height is dimensioned. The traveling probe is then placed on the rail and travels through a complete row of contacts in the card sight and in the I/O site.

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Spring Contact Z Height Scanner

A traveling probe with a series of sensitive fingers built into a movable housing is provided which can travel on and in a rail system to detect the high spring contacts and their location on the printed circuit board. After the spring contacts are soldered into place and the board stiffener bonded to the board, the rails are placed on locating pads and secured. The locating pads are part of the board from which the spring contact height is dimensioned. The traveling probe is then placed on the rail and travels through a complete row of contacts in the card sight and in the I/O site.

The probes, both card and I/O, consist of sensitive blades or fingers that are charged electrically when a positive-pole sensing blade stubs against a high spring contact, forcing it back against e stationary negative charged blade, thus causing a switch-like action. This action is then noted on a graduated-scaled rail and a console box with lights that indicate exactly what position is over the maximum allowable height. At this point, the high spring contact is marked for removal and/or reheated for a lower setting.

The probe is a series of thin metallic blades with protruding fingers, wired and insulated from each other and of proper length and used in conjunction with the rails to detect excessive contact height. The fingers on the probe, being much more sensitive than the soldered contacts, can move back and forth over the high position with no det...