Demountable 50x50 pad grid-array interconnect system

Laurence A. Daane; Michael Greenstein

doi:10.1117/12.271320

10 April 1997 Demountable 50x50 pad grid-array interconnect system

Laurence A. Daane, Michael Greenstein

Proceedings Volume 3037, Medical Imaging 1997: Ultrasonic Transducer Engineering; (1997) https://doi.org/10.1117/12.271320
Event: Medical Imaging 1997, 1997, Newport Beach, CA, United States

Abstract

Interconnecting a microminiature coaxial cable to a fully populated two-dimensional transducer array for diagnostic ultrasound is a significant challenge due to high element counts and termination densities. Pad grid array (PGA) structures allow inline interconnect to array contacts, but have not been previously demonstrated to allow elements to be interconnected at spacing matching the pitch of transducer arrays typical of 2.5 to 7.5 MHz diagnostic imaging (300 to 100 mm). PGAs provide a capable platform for experimentation and to allow transducer replacement because they are demountable. This paper reports on such a structure to allow a cabled 50 by 50 contact PGA to be connected by means of an anisotropic elastomeric anisotropic material to a 50 by 50 element transducer backing structure at 300 micron pitch, the acoustic half-wavelength normally used for 2.5 MHz imaging. Multiple flexible printed circuits provide the interconnect between coaxial cabling and a precision- drilled monolithic alumina substrate. The substrate is finished to provide a planar array of contact pads, each of which is used to contact gold wires embedded in a silicone medium which in turn connect to the backing electrodes of the transducer module. Using this approach, 97% of targeted interconnects were successfully accomplished. Acceptable pulse echo performance was demonstrated, suitable for diagnostic imaging.

Citation Download Citation

Laurence A. Daane and Michael Greenstein "Demountable 50x50 pad grid-array interconnect system", Proc. SPIE 3037, Medical Imaging 1997: Ultrasonic Transducer Engineering, (10 April 1997); https://doi.org/10.1117/12.271320

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available