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Browse Prior Art Database

SINGLE ACTION TAB TO PCB CLAMPING AND ALIGNING FIXTURE

IP.com Disclosure Number: IPCOM000007752D
Original Publication Date: 1996-Aug-01
Included in the Prior Art Database: 2002-Apr-19
Document File: 5 page(s) / 268K

Publishing Venue

Motorola

Related People

Duane J. Enck: AUTHOR [+3]

Abstract

Clamping and aligning of the LCD tab to the PC board requires that multiple manual operations be performed in the correct order to insure that the bonded assembly is not damaged due to the align- ment fixture. The design of the Single Action Tab To PCB Clamping And Aligning Fixture incorpo- rates the sequential order required to clamp, align, bond, and de-clamp, the LCD module to the PC board.

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MOlDROLA Technical Developments

SINGLE ACTION TAB TO PCB CLAMPING AND ALIGNING FIXTURE

by Duane J. Enck, Michael J. Rolfe and David S. Narducci

retracted back to the alignment position. The LCD clamping and aligning fixture must now be moved away horn the completed assembly in order to remove it from the board nest and ready the fixture for the next assembly process. In order to minimize the chances of damage to the board or LCD module, the tab clamp must be completely retracted from the assembly prior to moving the LCD nest away from the board and module. The LCD nest must also be moved far enough away from the board nest so that the completed assembly can be safely removed from the fixture. Finally the fixture had to be easy to use and robust enough to withstand many cycles without failure of any of its components.

ABSTRACT:

  Clamping and aligning of the LCD tab to the PC board requires that multiple manual operations be performed in the correct order to insure that the bonded assembly is not damaged due to the align- ment fixture. The design of the Single Action Tab To PCB Clamping And Aligning Fixture incorpo- rates the sequential order required to clamp, align, bond, and de-clamp, the LCD module to the PC board.

PROBLEM:

  Proper clamping to the PC board and alignment of the LCD module are essential to reducing the defects associated with the hot bar process, The LCD tab must be firmly clamped in order to reduce the chances that movement of the tab will occur while the clamped assembly is being shuttled into the bonding area. After the bond has been completed the fixture must be retracted away from the PC board/LCD assembly without damaging either the bond or the assembly. In order to achieve a high degree of reliability and repeatability the fixture must be designed to allow both the PC board and the LCD module to be loaded onto their nests without interference from any other parts of the lixturing. AAer the components have been loaded on their respective nests, the parts are then moved into the correct position and orientation for the final align- ment procedure, prior to bonding the LCD tab to the PC board. Final alignment of the tab to the PC board is performed and the aligned assembly is shut- tled into position for the bond. The bond is made by pressing a resistive heating element against the two surfaces to be bonded. The element is then heated to sufficient temperature to cause a pre-deposited amount of solder to reflow between the two bonding surfaces. Once the solder has been reflowed the entire bond area is cooled and the heating element is released from the bonded surfaces. Aher the heating element has been released, the bonded assembly is

  The Single Action Tab To PCB Clamping And Aligning Fixture 100 shown in Figure 1 is mounted on a standard Hot Bar/HSC bonding frame, (not shown), which includes the horizontal cylinder for shuttling the aligned components into the bond area and the vertical cylinder holding the hea...