Hinged bonding of micromechanical devices

• US 7,319,260 B1
• Filed: 10/16/2003
• Issued: 01/15/2008
• Est. Priority Date: 10/17/2002
• Status: Expired due to Fees

• Current Assignee: United States Of America As Represented By The Secretary Of The Air Force
• Original Assignee: United States Of America As Represented By The Secretary Of The Air Force
• Inventors: Michalicek, Mark A.
• Primary Examiner(s): Le; Thao P.
• Application Number:
  US10/690,159
• Time in Patent Office: 1,552 Days
• Field of Search: 257/415, 257/204, 257/E27.046, 257/E21.632
• US Class Current: 257/415
• CPC Class Codes: B81B 2201/047 Optical MEMS not provided for in B81B2201/042 - B81B2201/045
• CPC Class Codes: B81C 1/0023 Packaging together an electronic processing unit die and a micromechanical structure die MEMS packages B81B7/0032; MEMS packaging processes B81C1/00261
• CPC Class Codes: B81C 2201/019 Bonding or gluing multiple substrate layers
• CPC Class Codes: B81C 3/008 Aspects related to assembling from individually processed components, not covered by groups B81C3/001 - B81C3/002

Abstract

A locked hinge based technique for controllably holding surface-micromachined modules off the edge of a substrate for subsequent processing. The mechanism enables reliable, accurate, and low-cost fabrication of even complex multi layer flip-chip MEMS devices using for example only a simple two-layer module processing sequence, a sequence involving materials already in use in the process. The sequence is also free from the interference of an alignment-hindering sacrificial substrate member. The technique is disclosed by way of a micromirror example and is arranged for convenient bypassing where use of another bonding technique is desired.

Claims

1. A partially completed electronic circuit controllable MEMS device comprising the combination of:

an edge hinges-inclusive multi layer covered sacrificial first substrate member;

a MEMS module protective shield member pivotally received on said sacrificial first substrate edge hinges;

a MEMS module suspended from said MEMS module protective shield member by a plurality of severable tether members;

a MEMS module protective shield member latch assembly supporting said MEMS module protective shield member and said MEMS module in a selected substrate-removed location; and

a second substrate member-received MEMS controller electronic circuit die located in said selected substrate-removed location within severable tether members distance of a said latch assembly-stabilized MEMS module protective shield member in an orientation of subsequently-electable aligned physical unification engagement with said MEMS module;

said MEMS module protective shield member enabling safe manipulative positioning and safe liquid bath-engagement of said MEMS module during removed substrate, tethered, handling, positioning and processing of said module.

2. The partially completed electronic-circuit controllable MEMS device of claim 1 wherein said MEMS controller electronic circuit die comprises a CMOS electronic circuit.

3. The partially completed electronic circuit controllable MEMS device of claim 1 wherein said multi layer covered sacrificial first substrate member includes first and second polysilicon layers covering said substrate.

4. The partially completed electronic circuit controllable MEMS device of claim 3 wherein said MEMS module protective shield member, said MEMS module protective shield member latch assembly and said severable tether members are comprised of said polysilicon layer material.

5. The partially completed electronic circuit controllable MEMS device of claim 3 further including a plurality of protective shield member lifting beam members also comprised of said polysilicon layer material.

6. The partially completed electronic circuit controllable MEMS device of claim 1 wherein said MEMS module protective shield member latch assembly includes a sliding latch member held captive by a plurality of first substrate-attached rail members comprised of said polysilicon layer material.

7. The partially completed electronic circuit controllable MEMS device of claim 1 wherein said sacrificial first substrate member and said second substrate member are comprised of different-semiconductor materials.

8. The partially completed electronic circuit controllable MEMS device of claim 1 wherein said selected substrate-removed location of said MEMS module protective shield member latch assembly, said MEMS module protective shield member and said MEMS module is a position of one hundred eighty degrees rotation with respect to a planar surface of said sacrificial first substrate member.