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Top camera inspection and side camera

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#61545

Top camera inspection and side camera | 2 April, 2010

Hi, I think concept of inspection through AOI is changing. I am struck in confusion.Because some manufacturer say 3D inspection, with 1+4 cameras is ultimate solution. Orbotech also came with 13 cameras at once!Now some say, all these are eyewashing techniques. Only top camera will serve complete purpose of inspection.

Can anybody answer me,in detail, with the comparision between top camera AOI and side camera AOIs.

Thanx, Manjunath Bhatt

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#61547

Top camera inspection and side camera | 2 April, 2010

Manjunath

The top camera will be used for probably 90-95% of your inspection needs. However, without side cameras that 5-10% of uninspected parts can be a real pain to manually verify.

What you need to figure out is what is your product to inspect? Is it very simple parts or are there parts that will be hidded from a top down camera? Then you need to decide what is your future path of products. What works today may not work tomorrow.

Then need to decide if you are High Mix/Low Volume or Low Mix/High Volume. (Programming time and complexity)

Then where do you want to put system? Pre or Post reflow. Some systems are advertised as Post or Pre. I personally would not want to be "stuck" with one or the other. You may find later on what you chose to start with is not optimal and need to change where system is.

Next choice is price range and service.

Then after these questions are answered you should have a matrix of a few systems that fit all or most of the paramters. Ask the AOI provider for references that you can contact.

If possible ask to eval a system at your facility? (not always possible but preferable.)

If not then take a set of good boards and bad boards and have the provider program them and then see how long this takes and what defects are caught when inspecting them.

Now to answer your question of Top vs. Side. Because the cost of cameras and computing power continues to drop providers will continually upgrade their systems to give maximum value. It is always better to have more and not need it then to have less and need more.

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#61549

Top camera inspection and side camera | 2 April, 2010

Manjunath,

I prefer orthogonal systems. In my experience they are actually better at detecting coplanarity and HIP defects than multi camera systems. They are obviously limited, in that they can not inspect a component under another component, but the image acquired from an angled camera usually isn't suitable for a complete inspection anyways. Our multi camera systems had big problems with boards that had any warpage. The multi camera systems were much more programming intensive. My advice is, if possible, go with a single camera, but like fishingfool said, you have to evaluate each type based on the product you have inspect.

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