G - Physics – 11 – B
Patent
G - Physics
11
B
352/24.32
G11B 5/82 (2006.01) G11B 17/03 (2006.01) G11B 17/04 (2006.01) G11B 23/033 (2006.01) G11B 23/04 (2006.01) G11B 23/50 (2006.01)
Patent
CA 1152641
SO 1364 ABSTRACT OF THE DISCLOSURE A jacket for positioning a disc-shaped magnetic recording sheet in an information signal recording and/or reproducing apparatus includes an upper plate, a lower plate which cooperates with the upper plate for sandwiching the recording sheet therebetween, and a positioning device for maintaining the upper and lower plates a substantially fixed distance apart and which may include one or more of the following: (1) ferromagnetic pieces mounted in grooves in the outer surfaces of the upper and lower plates and having upper surfaces thereof situated below the outer surfaces of the plates, the ferromagnetic pieces being magnetically attracted by electromagnets or permanent magnets in the apparatus to pull the plates apart a fixed distance; (2) inclined surfaces at the periphery of apertures in the upper and lower plates and the apparatus includes claw-like members for engaging the inclined surfaces to pull the plates apart a fixed distance; (3) openings in the upper and lower plates, for example, central openings in each of the plates and a head insertion opening in one plate and a corresponding slit-like opening situated in opposing relation in the other plate, for maintaining an air pressure balance on both sides of the recording sheet when rotated; (4) spacer members attached to the inner surface of one or both of the upper and lower plates for maintaining a fixed distance therebetween by preventing any deformation of the plates when the jacket is secured in the apparatus by upper and lower position pins. -1-
366846
Gowling Lafleur Henderson Llp
Sony Corporation
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