Mounting of pickup stylus

In a magnetic sound pickup, for tracking mechanically modulated grooves in a record support by means of a tracking stylus, of the type having a magnetic circuit, including a permanent magnet and a stylus holder having a ferromagnetic part, and fixed pickup coils associated with the magnetic circuit, and in which the reluctance of the magnetic circuit is varied by displacement of the stylus holder by the tracking stylus mounted therein, the stylus holder being elastically mounted adjacent its center of motion, in a bearing element of elastic material, such as rubber and rubber-like material, an improved pickup mounting comprising, in combination, a metal plate embedded in said bearing element and extending perpendicular to the longitudinal axis of said stylus holder, and having a central opening therein;

• said stylus holder having a portion passing through said central opening of said plate and the diameter of said central opening being slightly larger than the external diameter of said stylus holder in the portion thereof passing through said central opening of said plate;
• the thickness of said plate being small relative to such external diameter of said stylus holder;
• said stylus holder being connected to said plate only through said bearing element;
• a relatively elongated, slender, tubular sleeve of ferromagnetic material closed at one end and open at the other end, and constituting part of said magnetic circuit;
• said permanent magnet being engaged with the closed end of said tubular sleeve and having relatively elongated, rod-shaped pole pieces extending toward the open end of said tubular sleeve;
• said plate being made of ferromagnetic material and being engaged with the open end of said tubular sleeve to also constitute part of said magnetic circuit;
• said stylus holder having its inner end extending between said rod-shaped pole pieces.

In a magnetic sound pickup, for tracking mechanically modulated grooves in a record support by means of a tracking stylus, of the type having a magnetic circuit, including a permanent magnet and a stylus holder having said permanent magnet forming a unit therewith, and fixed pickup coils associated with the magnetic circuit, and in which the reluctance of the magnetic circuit is varied by displacement of the stylus holder by the tracking stylus mounted therein, the stylus holder being elastically mounted adjacent its center of motion, in a bearing element of elastic material, such as rubber and rubber-like material, an improved pickup mounting comprising, in combination, a metal plate embedded in said bearing element and extending perpendicular to the longitudinal axis of said stylus holder, and having a central opening therein;

• said stylus holder having a portion passing through said central opening of said plate and the diameter of said central opening being slightly larger than the external diameter of said stylus holder in the portion thereof passing through said central opening of said plate;
• the thickness of said plate being small relative to such external diameter of said stylus holder;
• said stylus holder being connected to said plate only through said bearing element;
• a relatively elongated, slender, tubular sleeve of ferromagnetic material closed at one end and open at the other end, and constituting part of said magnetic circuit;
• and relatively elongated, rod-shaped pole pieces extending from the closed end toward the open end of said tubular sleeve;
• said plate being made of ferromagnetic material and being engaged with the open end of said tubular sleeve to also constitute part of said magnetic circuit;
• said stylus holder having its inner end extending between said rod-shaped pole pieces.