Abstract: A compact test range system for testing an article located within a test zone comprises a reflector defining a surface and a focus, a feed horn configured to emit radio waves, one or more processors, and a memory coupled to the processor. The radio wave includes an infinite number of rays, where the rays of the radio wave include an uppermost ray, a middle ray, and a lowermost ray directed towards the surface of the reflector. The memory stores data comprising a database and program code that, when executed by processors, causes the compact range test system to receive as input a plurality of field tilt angles. In response to receiving the field tilt angles, the system determines three points of intersection between the uppermost radio wave, the middle radio wave, and the lowermost radio wave that correspond to a first test position.

Abstract: A compact test range system for testing an article located within a test zone comprises a reflector defining a surface and a focus, a feed horn configured to emit radio waves, one or more processors, and a memory coupled to the processor. The radio wave includes an infinite number of rays, where the rays of the radio wave include an uppermost ray, a middle ray, and a lowermost ray directed towards the surface of the reflector. The memory stores data comprising a database and program code that, when executed by processors, causes the compact range test system to receive as input a plurality of field tilt angles. In response to receiving the field tilt angles, the system determines three points of intersection between the uppermost radio wave, the middle radio wave, and the lowermost radio wave that correspond to a first test position.

Abstract: The present invention includes a data disc support assembly for supporting a data disc relative to a head so data on a surface of the disc is accessible by the head. The support assembly includes a hub which has first and second axial ends and a flange extending from the second axial end. The flange supports the data disc. A clamp is connected to the hub to rigidly connect the data disc to the hub. The clamp has a first generally annular portion contacting the data disc and a second generally annular portion extending axially away from the hub beyond the first annular portion. The second annular portion is spaced from the data disc by a distance greater than the height of the head.

Abstract: A disc drive for storing and retrieving data from at least one memory storage disc includes a drive base and a spindle motor. The spindle motor includes a rotor hub, a shaft, a bearing unit. The bearing unit rotatably supports the rotor hub about an axis. A controlled resistance electrical pathway is established from the rotor hub to ground to control disc potential and to prevent excess static charge buildup. In one embodiment, the spindle motor includes structural elements made of a conducting plastic having a controlled resistance to establish a controlled resistance electrical pathway from the rotor hub to ground. In a second embodiment, the shaft of the spindle motor includes a conductive contact button electrically connected to the shaft and operatively coupled with a contact shield electrically grounded by an electrical conductor having a controlled resistance.

Abstract: A disc drive for storing and retrieving data from at least one memory storage disc includes a drive base and a spindle motor. The spindle motor includes a rotor hub, a shaft, a bearing unit. The bearing unit rotatably supports the rotor hub about an axis. A controlled resistance electrical pathway is established from the rotor hub to ground to control disc potential and to prevent excess static charge buildup. In one embodiment, the spindle motor includes structural elements made of a conducting plastic having a controlled resistance to establish a controlled resistance electrical pathway from the rotor hub to ground. In a second embodiment, the shaft of the spindle motor includes a conductive contact button electrically connected to the shaft and operatively coupled with a contact shield electrically grounded by an electrical conductor having a controlled resistance.

Abstract: A disc drive for storing and retrieving data from at least one memory storage disc includes a drive base and a spindle motor. The spindle motor includes a rotor hub, a shaft, a bearing sleeve, and a bearing unit. The bearing unit is operably coupled to the rotor hub and includes an inner race secured to the shaft, an outer race secured to the bearing sleeve, and bearing balls fitted between the inner race and the outer race. The bearing balls rotatably support the rotor hub about an axis. At least one structural element of the spindle motor has a high resistivity so as to electrically isolate the hub from the base. In another embodiment, the drive base has an interface surface for coupling with the spindle motor. The interface surface includes a layer of high resistivity material. In another embodiment, the bearing ball is made of ceramic or ruby material to improve performance characteristics.