Patent ID: 7499828

Claim:
An apparatus for determining the relative displacement of a golf putter, comprising: a transmitter unit; and a receiver unit; wherein the transmitter unit is removably attached to a putter shaft, the transmitter unit includes a first, a second, and a third light emitting diode for transmitting positional data relating to the putter to the receiver, the first diode is positioned above the second diode such that a line defined by the center of the first and the second diodes is vertical to each other, the third diode is positioned along an arm extending outward from the putter shaft and backward in a direction generally away from the direction of data transmission so as to be farther from the receiver than the first and second light emitting diodes, the diodes having predefined movement parameters based on the position of each diode on the golf putter; and wherein the receiver unit includes: an optical receptor to collect the data from each diode; and a processor for processing the data to provide a single valid solution set generated in part by eliminating positional movements that exceed the predefined movement parameters a display for viewing the valid solution set for the purpose of at least stroke analysis.