Lifter device for magnetic disk cartridge having a curved spring structure
AssigneesSony Corporation, Sony Electronics Inc.
InventorWalter Duane Drebenstedt
Life of this patent
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Abstract
A lifter device for a magnetic recording diskette which has a resilient, flexible, relatively rigid plastic sheeting, such as polyethylene terephthalate (PET). The lifter device curves upward from an inner surface of the casing to which it is affixed toward a pad which contacts the recording material within the diskette. The lifter maintains a desired amount of pressure against the pad over an extended range of operating conditions.
Claims16
A disk apparatus comprising:
- a casing;
- a planar, circular shaped recording material rotatably disposed within said casing;
- a pair of pad members disposed on opposing surfaces of said recording material;
- and
- a spring structure comprising a resilient, flexible, relatively rigid plastic sheeting disposed within said casing, said spring structure having a lower portion affixed to an inner surface of said casing, said spring structure extending from said inner surface of said casing to contact one of said pair of pad members, thereby providing pressure against the one of said pair of pad members to which said spring structure portion contacts;
- wherein said spring structure consists essentially of polyethylene terephthalate;
- and
- wherein said spring structure has a convex curve shape on a side of said spring structure facing away from said pad members and wherein said spring structure has a radius of curvature of approximately 40 mm between an end portion and said lower portion prior to being compressed by the one of said pair of pad members to which said spring structure contacts.
A lifter device for maintaining a predetermined amount of pressure between a pad and a recording medium disposed in a magnetic recording cartridge, said lifter device comprising:
- a curved leaf spring structure extending from a lower portion that is affixed to an inner surface of said casing toward said pad, said spring structure providing pressure against said pad;
- wherein said lifter device is formed of a resilient, flexible, relatively rigid plastic sheeting consisting essentially of polyethylene terephthalate;
- and
- wherein said spring structure has a convex curve shape on a side of said spring structure facing away from said pad, and wherein said spring structure has a radius of curvature of approximately 40 mm between an end portion and said lower portion prior to being compressed by said pad.
A lifter device for maintaining a predetermined amount of pressure between a pad and a recording medium disposed in a magnetic recording cartridge, said lifter device comprising:
- a curved leaf spring structure having a first portion affixed to an inner surface of a casing of said cartridge and a second portion for contacting and providing a spring pressure against said pad, said spring structure having a convex curve shape prior to being compressed by said pad, said convex curve shape extending from said first portion to said second portion on a side of said spring structure facing said inner surface of said casing, wherein said spring structure has a radius of curvature of approximately 40 mm between said first and second end portions prior to being compressed by said pad.
A disk apparatus comprising:
- a casing having an outer and an inner surface;
- a planar, circular shaped recording material rotatably disposed within said casing;
- a pair of pad members disposed on opposing surfaces of said recording material;
- and
- a spring structure comprising a resilient, flexible, relatively rigid sheeting disposed within said casing, said spring structure having a first portion affixed to an inner surface of said casing and a second portion for contacting and providing a spring pressure against one of said pad members;
- wherein said spring structure has a convex curve shape prior to being compressed by said one of said pad members, said convex curve shape extending from said first portion to said second portion on a side of said spring structure facing said inner surface of said casing, and wherein said convex curve shape has a radius of curvature of approximately 40 mm prior to being compressed by said one of said pad members.
Dependencies are inferred from the claim text.