Registration of a Test Head Assembly in a Single Disk Test Manufacturing Certifier
Original Publication Date: 2001-Aug-01
Included in the Prior Art Database: 2003-Jun-18
Disclosed is a device for aligning a test head assembly to a single disk test (S.D.T.) manufacturing certifier. The device under disclosure utilizes a spring-loaded cam lock registration device which guarantees that the test heads assembly is properly registered within the S.D.T. manufacturing certifier, and eliminates problems associated with the current industry standard head registration systems. An S.D.T. manufacturing certifier is a device used in the rigid media (disk) industry to certify the media prior to shipmet. Certification is achieved by flying test head assemblies over the disk to reject defects. It is these test head assemblies which must be replaced on a frequent basis, and it is the registration of these test head assemblies within the S.D.T. manufacturing certifier that this device addresses. The current industry standard head attachment/registration system typically uses one of the following two methods: 1. Allen-type screws used to register the test head within the certifier. This is done by tightening the screws onto the test head assembly. 2. Spring loaded levers used to register the test head in place. This is done by using the spring force to hold the test head assembly tight within the certifier. There is a problem with both of these schemes. Current methods of attachment provide guaranteed registration in only two of the three dimensions. These two dimensions (relative to the plane of the disk) are in the Z direction (up and down) and Y direction (left and right). They do not provide guaranteed registration in the X direction (forward and back). The invention described here utilizes industry standard methods to provide proper registration in the Y and Z directions, however the new cam lock registration device provides proper registration in the important X direction. As the disk is being tested, the heads are moved in the X-direction across the surface of the disk by another assembly. Failure to properly register the test heads in the X-direction can result in test head assembly crashing into the device which rotates the disk during testing. The device invented utilizes a spring loaded cam lock registration device to provide registration force directed to the test head assembly to provide registration against a registration pin. It also provides feedback to the operator that the test head assembly is installed correctly. The cam lock registration device is 1 pictured as follows: The heads are inserted into the certifier from the left, and the test head assembly is registered within the registration device and held against the registration pin by the registration force. It is this placement against the registration pin that guarantees proper test head registration in the X-Direction.