Browse Prior Art Database

CAMERA / OPTICS ALIGNMENT TOOL

IP.com Disclosure Number: IPCOM000009847D
Original Publication Date: 2000-May-01
Included in the Prior Art Database: 2002-Sep-23
Document File: 1 page(s) / 61K

Publishing Venue

Motorola

Related People

Kevin M. Reinhart: AUTHOR

Abstract

Machine vision assisted optical alignment is a common practice in manufacturing. Nonnally, the cameras are aligned to fiducial/locating marks that are on the same focal plane as the object being assembled. However, when the objects to be aligned are not on the same focal plane, the nonnality of the camera and optics to the object being aligned become of utmost importance.

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MOTOROLA

Technical Developments

CAMERA / OPTICS ALIGNMENT TOOL

by Kevin M. Reinhart

PROBLEM TO BE SOLVED

Machine vision assisted optical alignment is a common practice in manufacturing. Nonnally, the cameras are aligned to fiducial/locating marks that are on the same focal plane as the object being assembled. However, when the objects to be aligned are not on the same focal plane, the nonnality of the camera and optics to the object being aligned become of utmost importance.

The manual alignment of Flat Panel Displays uses multiple camera/lens assemblies which simultaneously image the parts to be aligned (the Anode and Cathode). Since there is a cell gap between these two plates, the aforementioned scenario is replicated multiple times within the same work station. So, the alignment of the cameras to one another and normal to the reference plane is critical.

SOLUTION

Typically, cameras and lenses are aligned using dial indicators or other mechanical methods to align the outer body of the lens to the reference plane.

However, this relies on the accuracy of the manufacture of the outer lens body being relative to the position of the lenses. Since the objective is to be able to image orthogonal points at the same point on the camera, a method was developed that used the camera as the alignment device.

To affect this alignment a tool was developed (see figure 1) with a sharpened pin affixed in a base.

Immediately above the pin, but approaching from

Motorola. Inc. 2000

the opposi...