Thomson Licensing S.a.

Thomson Licensing

Hmy, Ltd.

Hmy Group

Hmy Gestion

Philippe Berthaud

Patrice Hirtzlin

Michel Perrot

Ali Louzir

Jean-Fran&ccedil;ois Pintos

Jean-Pierre Collin

Philippe Hervieux

Guillaume Chowaniak

Jacques Bertheau

Paul Girardin

William Dahan

Jean-François Thomas

In a video recorder with a rotary head drum, a lower drum () and drum base () are joined together by laser welding to simplify assembly and reduce manufacturing cost.

Laser welded head drum for VCR

According to a first aspect the present invention is related to a head drum arrangement allowing a much easier mounting of the rotary transformer. The head drum arrangement comprises a non-rotating lower drum and a rotating upper drum, which are connected by a shaft fixed in the lower drum. The upper drum is mounted on the shaft by a bearing and preferably by two ball bearings. A rotary transformer is arranged between the lower drum and the upper drum having a fixed stator and a rotor rotating jointly with the upper drum. The rotor is non-positively held in its position by the magnetic force of a permanent magnet accommodated in the upper drum.

Head drum with magnetic mounting of rotary transformer

Devices for sending and receiving electromagnetic waves

The invention proposes the use of a reel, for instance for a device for electromagnetic wave communication, comprising a first component movable in rotation in relation to a second component about an axis and at least one first cable fixed to the first component at at least one point. The first cable is fixed to the second component at at least one point and the first cable is wound spirally about the axis. The reel comprises at least one second cable wound spirally about the axis and separated from the first cable by a first flange perpendicular to the axis.

Cable reel and electromagnetic wave communication device equipped with such a reel

Growing community of inventors

Tonnerre, France

Philippe Berthaud