Sony patents tape cartridge that stays stable in heat
Sony describes a magnetic tape cartridge designed to function reliably in high-temperature environments. The tape features a specific textured surface and a flexible base layer to prevent the tape from stretching unevenly when stored at 65°C for extended periods.
In the filing’s own words
An object is to provide a magnetic recording cartridge suited for storage and running under a high-temperature environment. A magnetic recording cartridge that includes a cartridge case, a reel, and a magnetic recording medium, in which when a width change amount of the magnetic recording medium wound on the reel is measured, a sign of a width change amount Δout on an outer winding side and a sign of a width change amount Δin on an inner winding side differ, and the width change amount is 0 ppm at a position of one of two regions between which a center line of an entire length of the magnetic recording medium is situated, the two regions being from among four regions into which the entire length is quadrisected; the magnetic recording medium includes a magnetic layer; the magnetic layer has a concavo-convex shape on a magnetic surface thereof; a height range ΔH of a height of the concavo-convex shape satisfies “3.00 nm≤ΔH≤6.00 nm”; a gradient range ΔA of a gradient of the concavo-convex shape satisfies “3.80 degrees≤ΔA≤9.00 degrees”; and the magnetic recording medium includes a base layer.
What exactly they claim (claim 1)
1. A magnetic recording cartridge, comprising: a cartridge case; a reel; and a magnetic recording medium wound on the reel, the wound magnetic recording medium being accommodated in the cartridge case, wherein when a width change amount of the magnetic recording medium is measured across an entire length of the magnetic recording medium after the magnetic recording medium wound on the reel is stored at 65° C. for 360 hours, a sign of a width change amount Δout on an outer winding side of the magnetic recording medium and a sign of a width change amount Δin on an inner winding side of the magnetic recording medium differ, and the width change amount is 0 ppm at a position of one of two regions between which a center line of the entire length of the magnetic recording medium is situated, the two regions being from among four regions into which the entire length is quadrisected, the magnetic recording medium includes a magnetic layer, the magnetic layer has a concavo-convex shape on a magnetic surface thereof, a height range ΔH obtained from statistical information regarding a height of the concavo-convex shape satisfies “3.00 nm≤ΔH≤6.00 nm”, a gradient range ΔA obtained from statistical information regarding a gradient of the concavo-convex shape satisfies “3.80 degrees≤ΔA≤9.00 degrees”, and the magnetic recording medium includes a base layer having a loss elastic modulus of 0.40 GPa or less at 65° C.
Facts
- Company
- Sony (SONY GROUP CORPORATION)
- Official title
- MAGNETIC RECORDING CARTRIDGE
- Publication number
- US20260331129A1
- Application number
- 19122815
- Filed
- Oct 16, 2023
- Published
- Oct 22, 2026
- Inventors
- 4
- Claims
- 20
Classified under
G11B 5/00813 Physics & computingMore from Sony in Chips & hardware
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Summaries are simplified from the filing’s own abstract and first claim. A patent filing is not a product announcement.
Patent data and drawings: U.S. Patent and Trademark Office (USPTO). Nebula is not affiliated with or endorsed by the USPTO.