Tape reel with reel hub having expanding outer peripheral regions, tape cartridge, and apparatus for producing tape reel

Patent metadata

Field	Value
Publication number	US-12322415-B2
Application number	US-202218281714-A
Country	US
Kind code	B2
Filing date	Feb 9, 2022
Priority date	Mar 17, 2021
Publication date	Jun 3, 2025
Grant date	Jun 3, 2025

Abstract

A tape reel includes: a first flange; a second flange; and a reel hub. The reel hub includes a first end portion formed integrally with the first flange, a second end portion to which the second flange is bonded, and an outer peripheral surface on which a magnetic tape is wound. The outer peripheral surface of the reel hub has a first outer peripheral region and a second outer peripheral region. The first outer peripheral region expands in diameter from the first end portion toward the second end portion. The second outer peripheral region expands in diameter from the first outer peripheral region across the second end portion and forms a ridge line portion having a shape projecting radially outward of the hub portion on a boundary between the second outer peripheral region and the first outer peripheral region.

First claim

The invention claimed is:

1. A tape reel, comprising:
a first flange;
a second flange; and
a reel hub that has a cylindrical shape and includes a first end portion formed integrally with the first flange, a second end portion to which the second flange is bonded, and an outer peripheral surface on which a magnetic tape is wound,
the outer peripheral surface of the reel hub having
a first outer peripheral region expanding in diameter from the first end portion toward the second end portion, and
a second outer peripheral region expanding in diameter from the first outer peripheral region across the second end portion and forming a ridge line portion having a shape projecting radially outward of the reel hub on a boundary between the second outer peripheral region and the first outer peripheral region,

wherein the ridge line portion is located closer to the first end portion than a center of a height of the reel hub.

2. An apparatus for producing a tape reel that includes the tape reel according to claim 1 , comprising:
a first mold for molding the outer peripheral surface of the reel hub; and
a second mold for molding an inner peripheral surface of the reel hub,
the first mold having
a first molding surface configured by a tapered surface forming the first outer peripheral region, and
a second molding surface configured by a cylindrical surface forming the second outer peripheral region.

3. A tape reel, comprising:
a first flange;
a second flange; and
a reel hub that has a cylindrical shape and includes a first end portion formed integrally with the first flange, a second end portion to which the second flange is bonded, and an outer peripheral surface on which a magnetic tape is wound,
the outer peripheral surface of the reel hub having
a first outer peripheral region expanding in diameter from the first end portion toward the second end portion, and
a second outer peripheral region expanding in diameter from the first outer peripheral region across the second end portion and forming a ridge line portion having a shape projecting radially outward of the reel hub on a boundary between the second outer peripheral region and the first outer peripheral region, wherein

a difference between an outer diameter of the ridge line portion and an outer diameter of the first end portion is 10 μm or more and 50 μm or less, and
a difference between the outer diameter of the first end portion and an outer diameter of the second end portion is 30 μm or more and 90 μm or less.

4. The tape reel according to claim 3 , wherein
the first flange and the reel hub are a molded body of a composite material of a glass filler contained in a synthetic resin material.

5. The tape reel according to claim 4 , wherein
the synthetic resin material is a polycarbonate resin, and the content of the glass filler is 10% or more and 20% or less in a weight ratio with respect to the polycarbonate resin.

6. An apparatus for producing a tape reel that includes the tape reel according to claim 3 , comprising:
a first mold for molding the outer peripheral surface of the reel hub; and
a second mold for molding an inner peripheral surface of the reel hub,
the first mold having
a first molding surface configured by a tapered surface forming the first outer peripheral region, and
a second molding surface configured by a cylindrical surface forming the second outer peripheral region.

7. A tape reel, comprising:
a first flange;
a second flange; and
a reel hub that has a cylindrical shape and includes a first end portion formed integrally with the first flange, a second end portion to which the second flange is bonded, and an outer peripheral surface on which a magnetic tape is wound,
the outer peripheral surface of the reel hub having
a first outer peripheral region expanding in diameter from the first end portion toward the second end portion, and
a second outer peripheral region expanding in diameter from the first outer peripheral region across the second end portion and forming a ridge line portion having a shape projecting radially outward of the reel hub on a boundary between the second outer peripheral region and the first outer peripheral region, wherein

the reel hub has a height of approximately 13 mm, and
a length from the first end portion to the ridge line portion is 3 mm or more and 5 mm or less.

8. An apparatus for producing a tape reel that includes the tape reel according to claim 7 , comprising:
a first mold for molding the outer peripheral surface of the reel hub; and
a second mold for molding an inner peripheral surface of the reel hub,
the first mold having
a first molding surface configured by a tapered surface forming the first outer peripheral region, and
a second molding surface configured by a cylindrical surface forming the second outer peripheral region.

9. A tape cartridge, comprising:
a tape reel that includes a first flange, a second flange, and a reel hub that has a cylindrical shape and includes a first end portion to be connected to the first flange, a second end portion to be connected to the second flange, and an outer peripheral surface on which a magnetic tape is wound,
the outer peripheral surface of the reel hub having
a first outer peripheral region expanding in diameter from the first end portion toward the second end portion, and
a second outer peripheral region expanding in diameter from the first outer peripheral region across the second end portion and forming a ridge line portion having a shape projecting radially outward of the reel hub on a boundary between the second outer peripheral region and the first outer peripheral region,

wherein the ridge line portion is located closer to the first end portion than a center of a height of the reel hub.

10. The tape cartridge according to claim 9 , wherein
a radius difference between the first end portion and the second end portion after preserving the tape cartridge for one week in an environment of a temperature of 49° C. and a relative humidity of 80% while the magnetic tape is wound around the tape reel is 10 μm or less.

11. The tape cartridge according to claim 9 , wherein
the magnetic tape has a thickness of 5.6 μm or less and a length of 960 m or more.

12. A tape cartridge, comprising:
a tape reel that includes a first flange, a second flange, and a reel hub that has a cylindrical shape and includes a first end portion to be connected to the first flange, a second end portion to be connected to the second flange, and an outer peripheral surface on which a magnetic tape is wound,
the outer peripheral surface of the reel hub having
a first outer peripheral region expanding in diameter from the first end portion toward the second end portion, and
a second outer peripheral region expanding in diameter from the first outer peripheral region across the second end portion and forming a ridge line portion having a shape projecting radially outward of the reel hub on a boundary between the second outer peripheral region and the first outer peripheral region,

wherein
a difference between an outer diameter of the ridge line portion and an outer diameter of the first end portion is 10 μm or more and 50 μm or less, and a difference between the outer diameter of the first end portion and an outer diameter of
the second end portion is 30 μm or more and 90 μm or less.

13. A tape cartridge, comprising:
a tape reel that includes a first flange, a second flange, and a reel hub that has a cylindrical shape and includes a first end portion to be connected to the first flange, a second end portion to be connected to the second flange, and an o

Assignees

• Sony Group Corp

Inventors

• Saito Takeshi
• Suzuki Tatsuo

Classifications

• G11B15/32

  through the reels or cores on to which the record carrier is wound · CPC title

• G11B23/107

  using one reel or core, one end of the record carrier coming out of the magazine or cassette · CPC title

• G11B5/78

  Tape carriers · CPC title

• G11B23/087

  using two different reels or cores · CPC title

• G11B5/84

  Processes or apparatus specially adapted for manufacturing record carriers · CPC title