Camera to Nozzle Coplanar Alignment

Summary 

Step-by-step guide on how to check and adjust the Camera to Nozzle Coplanar Alignment on 3x00 and 4x00 APS

Details

For the BPM Microsystems handlers to correctly and accurately measure and align devices for accurate placement, the nozzle must be aligned perfectly perpendicular to the plane of the Cyberoptic camera.

Tools needed: Set of SAE Hex wrenches, a TSOP device, a straight or new Z Bellows (CPICROD01), and a standard nozzle tip (CPICNOZ01), with a new o-ring (CPICORING01).

Start BPWin and check the nozzle runout (this can be found in the BPWin output window or current html log file at c:\bp\datalog\blackbox.html. The nozzle runout must be less than 2 mils for the most accurate alignment. Correct or replace the Z bellows/nozzle as necessary. 

Open the interlock and move the head forward so that accessing the nozzle will be easier.

Go to Autohandler/Diagnostics/CyberView. In the Cyberview dialog window, click the Capture button. 

The Cyberoptic camera has

an laser

emitter on one side, and a detector on the other side. Each side also has a lens that must be kept clean as part of maintenance.

The blue squiggly line represents the Cyberoptic camera laser beam cast across the entire opening of the detector. The left side of the "window" is toward the back of the handler, the right side is toward the front. The height of the beam is a function of intensity. The scale on the right side shows that the unblocked laser beam is 150 units of intensity. The dip in the middle is the nozzle tip. It is casting a partial shadow. A full shadow would be indicated by an intensity of 0. At this point, the nozzle is at the home position, defined as where the nozzle tip just breaks the Cyberoptic beam. This diagram explains the Camera beam graphically:

Click the Vacuum On button, and place a TSOP (or large QFP) upside down on the nozzle. Square up the device to the Cyberoptic camera so that the longest side is facing and square to the lenses. This will cast the widest shadow.

If you click the Capture button now, you will see that the full width of the device will cast a complete shadow as in the following example.

Use the Z-axis Pick and Place Control to raise the nozzle until the bottom of the device can be seen. (

Actually

the top of the device, because it's on the nozzle upside down)

Enter a positive value

,

example: 10 mil in the Z-axis Relative Pos box, and click Move Up. Then capture. Move up more if necessary. Click capture. In the following example, the device was raised too high. 

Change the value from 10 to 2 mils and click Move Down to fine tune the Z position. Not that the Z-axis Position value changes as you move the nozzle up and down.

Keep trying until you can see the bottom of the device as in this example:

Nozzle

is not perpendicular to the camera in the example above. If it were, the device's shadow would be horizontal, and not angled.

In the W-axis (Theta) Relative Pos box, enter 180 deg, and click Rotate CW (or Rotate CCW, the effect is the same). Click Capture again and see what the image looks like. You may need to

fine tune

the nozzle height again.

The resulting 180 deg.

image

will tell a story. If the device surface is still slanted, and is slanted in the same direction, then the camera is not

coplanar,

and needs to be shimmed. If the image is slanted but in the opposite direction then the Nozzle is probably bent. Replace the nozzle and try again. 

For the 3x00 APS system,

adjustment

is made by shimming the theta motor. 

•  
  
•  
  
• 
  

For the 4x00 APS System,

adjustment

is made by shimming the camera.

• 
  

The result of the shimming is to get the device image as close to horizontal as possible. The following images show good alignments.

Although the following image is not completely horizontal, it is perfectly acceptable, good enough. The image should be good at both 0 and 180 deg.

When finished with the adjustment, remove the device from the nozzle, click the Vacuum Off button and then the Close button. The handler will initialize and home.

Because shimming will not significantly change the relative height of the Cyberoptic camera, reteaching is not required. No other calibration is necessary.

• Related Articles

• Nozzle Runout

  This test should be used to ensure that the Pick-and-Place nozzle is installed properly and that the CyberOptics Laser Align Camera will accurately measure a device during placement. A large runout can cause the CyberOptics Laser Align Camera to ...

• BPM APS Nozzle Chart

• Devices stick to Nozzle

  Symptoms When the nozzle goes down to place a device into a socket or other location, the device remains on the nozzle. As the nozzle returns to the Z home position, the device will then fall out of the nozzle. This issue can occur when changing jobs ...

• Poor Nozzle Vacuum

  If you are having issues teaching a device or location and are seeing vacuum related errors then this guide could help. In BPWin, there are some additional I/O and Sensor Diagnostics functions which should be used in this situation. BPM autohandlers ...

• BPM Automated Pick and Place Issues

  Indicators Pick errors, place errors or vision centering problems occur frequently during a job session. Troubleshoot Ensure that the stations and the package are taught correctly. This is the cause of the majority of Pick-and-Place problems. Run ...