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` US 6,462,905
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`A magnetic tape cartridge comprising a magnetic tape wound around a single reel, a cartridge
`4.
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`casing in which the reel is housed for rotation and a reel stopper means which locks the reel not to rotate
`when the magnetic tape cartridge is not being used and releases the reel to permit rotation thereof when the
`magnetic tape cartridge is to be used, wherein the improvement comprises that
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`the reel stopper means comprises a braking member which is movable between a locking position
`where it is in contact with the reel to restrict rotation of the reel and a releasing position where it is away
`from the reel to permit rotation of the same, an urging member which urges the braking member toward the
`locking position, and a releasing member which is rotated integrally with the reel and moves the braking
`member toward the releasing position in response to a reel chucking action of the reel drive means of a tape
`drive,
`the braking member is provided with a braking gear which is adapted to be engaged, to restrict
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`rotation of the reel, with an engagement gear tooth on an engagement projection formed on the reel, and
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`each of the gear teeth of the braking gear has a first inclined surface which is brought into abutment
`against the engagement gear teeth when the reel is rotated in the tape-unwinding direction with the braking
`gear and the engagement gear tooth in mesh with each other and a second inclined surf ace which is brought
`into abutment against the engagement gear teeth when the reel is rotated in the tape-winding direction with
`the braking gear and the engagement gear tooth in mesh w ith each other, the first and second inclined surf
`aces forming therebetween an apical angle not larger than 90°, and the interior angle between the first
`inclined surface and the vertical being not larger than the interior angle between the second inclined surface
`and the vertical.
`
`A magnetic tape cartridge comprising a magnetic tape wound around a single reel, a cartridge casing
`4.
`in which the reel is housed for rotation and a reel stopper means which locks the reel not to rotate when the
`magnetic tape cartridge is not being used and releases the reel to permit rotation thereof when the magnetic
`tape cartridge is to be used, wherein the improvement comprises that
`
`the reel stopper means comprises a braking member which is movable between a locking position
`where it is in contact with the reel to restrict rotation of the reel and a releasing position where it is away
`from the reel to permit rotation of the same, an urging member which urges the braking member toward the
`locking position, and a releasing member which is rotated integrally with the reel and moves the braking
`member toward the releasing position in response to a reel chucking action of the reel drive means of a tape
`drive,
`the braking member is provided with a braking gear which is adapted to be engaged, to restrict
`
`rotation of the reel, with an engagement gear tooth on an engagement projection formed on the reel, and
`
`each of the gear teeth of the braking gear has a first inclined surface which is brought into abutment
`against the engagement gear teeth when the reel is rotated in the tape-unwinding direction with the braking
`gear and the engagement gear tooth in mesh with each other and a second inclined surface which is brought
`into abutment against the engagement gear teeth when the reel is rotated in the tape-winding direction with
`the braking gear and the engagement gear tooth in mesh with each other, the first and second inclined
`surfaces forming therebetween an apical angle not larger than 90° and the interior angle between the first
`inclined surface and the vertical being not larger than the interior angle between the second inclined surface
`and the vertical.
`
`SONY Exhibit 1016
`SONY v. FUJI
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