Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Disk record
Reexamination Certificate
2006-10-17
2006-10-17
Tupper, Robert S. (Department: 2652)
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Disk record
Reexamination Certificate
active
07123441
ABSTRACT:
An electric motor (19) comprises a first part (21) and a second part (23) which are moveable with respect to each other. The first part comprises a foil-shaped insulating substrate (51) on which a plurality of series-connected spiral-shaped patterns (67, 67′, 69, 69′, 71, 71′) of conductor tracks are provided. The second part comprises a permanent magnet unit (73) for generating a magnetic field at the location of the conductor tracks. Said patterns each comprise two main sections (79, 81) with substantially straight, parallel conductor tracks (83, 85) having first ends (89, 93) and second ends (91, 95), and two intermediate sections (97, 99) with curved conductor tracks (101, 103) which respectively mutually connect the first ends of the two main sections and mutually connect the second ends of the two main sections. Said intermediate sections each have a center area (105, 107) respectively halfway between the first ends of the two main sections and halfway between the second ends of the two main sections. According to the invention, each of the conductor tracks of the intermediate sections has a width (w, w′) which, seen from the first ends of each main section and from the second ends of each main section, respectively, to the center area of the intermediate section, initially increases and subsequently decreases. As a result, a motor stiffness of the electric motor is considerably increased, so that the motor speed is less affected during operation by external mechanical loads exerted on the motor.
REFERENCES:
patent: 4340833 (1982-07-01), Sudo et al.
patent: 4677332 (1987-06-01), Heyraud
patent: 4794293 (1988-12-01), Fuijsaki et al.
patent: 5644183 (1997-07-01), Van Loenen et al.
patent: 5892307 (1999-04-01), Pavovich et al.
patent: 6040650 (2000-03-01), Rao
patent: 0764357 (1997-03-01), None
patent: 04042744 (1992-02-01), None
Belk Michael E.
Koninklijke Philips Electronics , N.V.
Tupper Robert S.
LandOfFree
Electric motor having foil-shaped substrate with tracks with... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electric motor having foil-shaped substrate with tracks with..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electric motor having foil-shaped substrate with tracks with... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3631092