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

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.

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.

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.

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.

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 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.