G - Physics
11
B
352/31.3
G11B 5/82 (2006.01) G11B 5/84 (2006.01) G11B 7/24 (2006.01) G11B 23/00 (2006.01) G11B 23/033 (2006.01)
Patent
CA 1197922
- 1 - Recording Disc Abstract A recording disc (10,18) is provided by a disc-shaped, formed-sheet-metal support (18) across which a flexible recording sheet (10) is stretched. The formed- sheet-metal support (18) has a central spindle opening (30) which can be precisely centered by simultaneously punching the spindle opening (30) and the circular periphery, thus permitting high-speed rotation of the recording disc (10,18) in use.
424092
Minnesota Mining And Manufacturing Company
Smart & Biggar
LandOfFree
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