ROBERT L HENNESSEY
Broker in Walpole, MA
License number
Massachusetts 9532152
Issued Date
Jun 5, 2014
Expiration Date
Aug 28, 2018
Type
Salesperson
Address
Address
Walpole, MA 02032
Professional information
Nestless Plunge Mechanism For Semiconductor Testing
US Patent:
6864678, Mar 8, 2005
Filed:
Jul 16, 2003
Appl. No.:
10/621955
Inventors:
Charlie Ryder - Walpole MA, US
John A. Heald - Billerica MA, US
Robert Hennessey - East Walpole MA, US
John A. Heald - Billerica MA, US
Robert Hennessey - East Walpole MA, US
Assignee:
Delta Design, Inc. - Littleton MA
International Classification:
G01R031/02
US Classification:
3241581, 758765
Abstract:
A plunge mechanism includes an elongated, hollow probe that vacuum grips at its free end, and carries, without relative movement therebetween, an electronic device under test (DUT) to a test site on a board, or socket, of a test circuit. A reciprocating drive plunges the DUT in a first direction to a test site where the leads of the DUT each align with and connect electrically to an associated electrical contact. The drive uses a high-precision linear slide to maintain the alignment of the probe with the test site during the plunging movement. The probe materials and dimensions provide sufficient stiffness to resist a shift of the IC out of alignment due to the weight of the gripped DUT, vibrations, or contact forces between the DUT and the board or socket. The diameter of the probe is preferably smaller than the x-y dimensions of the DUT. No DUT alignment members are used on the test board or socket that limit the physical proximity of the DUT to its preferred test position with respect to the test circuit.