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Machine translation
1. (WO1981000164) PHONOGRAPH TONE ARM SYSTEM
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1981/000164    International Application No.:    PCT/US1980/000799
Publication Date: 22.01.1981 International Filing Date: 26.06.1980
IPC:
G11B 3/31 (2006.01), G11B 3/38 (2006.01)
Applicants:
Inventors:
Priority Data:
52730 28.06.1979 US
Title (EN) PHONOGRAPH TONE ARM SYSTEM
(FR) SYSTEME DE BRAS ACOUSTIQUE D"UN PHONOGRAPHE
Abstract: front page image
(EN)An improved phonograph tone arm device (33) in which the pickup, including the stylus, is supported on a low friction air-bearing support (25) which provides for essentially frictionless movement of the tone arm (33) and pickup (34) both in horizontal linear travel and vertical pivoting to assure proper stylus pressure. The tone arm support system includes a support member (25) having an upper surface (29) which is shaped as a right circular through or cylinder section and a floating member (30) which has a juxtaposed matching convex or concave lower surface. A recess (31) in the lower surface of the floating member forms a plenum to which air is supplied from one or more openings (28) in the support member. The length of the plenum is such that the supply openings are always beneath the plenum confines during the full traverse of the stylus across a record to be played to minimize the amount of air required and maximize uniformity of support for the floating member. Alternate embodiments allow either the upper or lower surface of the record to be played.
(FR)Un dispositif ameliore d"un bras acoustique d"un phonographe (33) dans lequel le "pick-up", y compris le style, est supporte sur un support de faible friction, a portance a air (25) qui assure un mouvement sensiblement sans friction du bras acoustique (33) et du "pick-up" (34) a la fois en deplacement lineaire horizontal et en pivotement vertical pour assurer une pression adequate du style. Le systeme de support du bras acoustique comprend un organe de support (25) ayant une surface superieure (29) ayant une forme de cuvette circulaire ou de section de cylindre et un organe flottant (30) qui possede une surface inferieure concave ou convexe correspondante juxtaposee. Un evidement (31) dans la surface inferieure de l"organe flottant forme une chambre de compression dans laquelle de l"air est alimente a partir d"une ou de plusieurs ouvertures (28) amenagees dans l"organe de support. La longueur de la chambre de compression est telle que les ouvertures d"alimentation se trouvent toujours sous les limites de la chambre de compression pendant toute la traversee par le style d"un disque joue pour reduire au minimum la quantite d"air requise et donner un maximum d"uniformite de support a l"organe flottant. D"autres modes de realisation permettent de jouer soit la face superieure soit la face inferieure d"un disque.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)