Abstract: This invention is concerned with apparatus for diagnosing the characteristics of a golf swing, of the type in which one or more magnets attached to the golf club create signals in pick-up loops located near the ball position, or analysis to provide a readout of swing characteristics such as dynamic loft, dynamic lie (rake), impact position at the club-face, speed, and club face angle. Such apparatus is now improved by causing at least one loop or loop combination to be formed to provide at least two generally identical loop portions located side-by-side across the ideal swing path A-B with their respective adjacent edges parallel and closely spaced for defining therebetween a notional center line across the said path as an accurate sensed position. This is more accurate than sensing a single loop edge, and more sensitive.

Abstract: A golf swing analyzing apparatus for detecting, measuring and/or displaying differences from a desired ideal golf swing is described. The apparatus comprises (a) one or two permanent magnets in spaced recess in one or more golf clubs, (b) a number of loops in a planar detector array close to the notional or actual ball position and (c) a readout device for picking up the various signals created as the magnets cross straight line portions of the loops and conveying them to indications of swing angle, club face angle, club face tilt, impact zone at the club face, speed acceleration, rake and so on. The magnitudes of speed, height sensitivity, and magnet strength permit such golf diagnostic equipment to be readily constructed and give usable displays of figures of (on a screen) outcome of the notional golf stroke.