Browse Prior Art Database

Top Side Probe Head Fixture for Laser Trimmer Systems

IP.com Disclosure Number: IPCOM000044110D
Original Publication Date: 1984-Nov-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 2 page(s) / 71K

Publishing Venue

IBM

Related People

Christensen, DN: AUTHOR [+2]

Abstract

A top side probe head fixture for laser trimmer systems allows top side probing of pinless substrates without modifying existing laser system substrate parts handlers. Existing laser trimmer systems use bottom side probing to make contact to the substrate or module I/O pins. Standard equipment is an eight-position substrate parts handler. To convert the systems to top side probing, the standard substrate parts handler is removed and replaced with a two-position top side probing parts handler. Use of the two-position parts handler reduces the machine loading and unloading times and has a probe alignment problem. Since top side probing is needed to make contact to the new pinless generation of substrates, a new design probe head fixture is needed to utilize the throughput of the eight-position parts handler. The fixture (Fig.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 52% of the total text.

Page 1 of 2

Top Side Probe Head Fixture for Laser Trimmer Systems

A top side probe head fixture for laser trimmer systems allows top side probing of pinless substrates without modifying existing laser system substrate parts handlers. Existing laser trimmer systems use bottom side probing to make contact to the substrate or module I/O pins. Standard equipment is an eight- position substrate parts handler. To convert the systems to top side probing, the standard substrate parts handler is removed and replaced with a two-position top side probing parts handler. Use of the two-position parts handler reduces the machine loading and unloading times and has a probe alignment problem. Since top side probing is needed to make contact to the new pinless generation of substrates, a new design probe head fixture is needed to utilize the throughput of the eight-position parts handler. The fixture (Fig. 1) consists of a substrate 1 which is placed into one of the eight substrate holder positions 2 and positioned under the new probe head 3. The probe head contains a number of spring- loaded probe tips or equivalent probe tips 4 which make contact with the substrate 1 when the voltage-controlled solenoid 5 is turned on. The laser beam 10 trims the cermet resistors, which are located on the top side of the substrate, through the laser trim ports 6 or open area in the probe head 3. Signals are sent to and from the substrate through the contact probe tips and the signal cable 7 between the pro...