Browse Prior Art Database

Compact Prism Alignment Mechanism

IP.com Disclosure Number: IPCOM000111860D
Original Publication Date: 1994-Apr-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Hernandez, B: AUTHOR [+5]

Abstract

The tool is used to align and place surface mount technology using an optical prism having a coating. The mechanism allows simultaneous viewing of components and a location on a printed circuit board. Commercial hardware is too large to accommodate compact tooling. This idea provides the listed features at a fraction of the size. Multiple prisms can be used for fine-pitch components having large dimensional perimeters.

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Compact Prism Alignment Mechanism

      The tool is used to align and place surface mount technology
using an optical prism having a coating.  The mechanism allows
simultaneous viewing of components and a location on a printed
circuit board.  Commercial hardware is too large to accommodate
compact tooling.  This idea provides the listed features at a
fraction of the size.  Multiple prisms can be used for fine-pitch
components having large dimensional perimeters.

      The Figure shows a conceptual view of the disclosure, which is
capable of viewing two opposing corners on a large outlined package.
The eyeballs (1) can be either a microscope or small video cameras.
The prisms (2) must be in alignment with the package corners.  Each
prism (2) has three counterbored clearance holes set in a triangular
pattern (4).  Between the holders (3) and the common toll-mounting
plate (5) is a thickness of closed cell silicone rubber (6).
Clearance holes are provided in the silicone rubber (6) that align
with the adjustment screws.  The two prism holders (3) are secured to
the common tool-mounting plate (5), by tightening the adjustment
screws (7) and compressing the silicone (6) to 25% of its original
thickness.  This will then allow the prisms to remain secure while
permitting individual screw movements to control yaw on each prism.