`
`4.
`
`A magnetic tape cartridge (1) comprising a magnetic tape wound
`
`around a single reel, (2), a cartridge casing in which(3) for housing the reel
`is housed for rotation(2) and a reel stopper means which locks (10) for
`locking the reel not to rotate when the magnetic tape cartridge is not being
`used and releases the reel to permit(2) or permitting rotation thereof when
`the magnetic tape cartridge is to be used, ,
`
`wherein the improvement comprises that
`
`the reel stopper means (10) comprises a braking member which is
`movable(4) being moveable 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(5) for urging the braking member (4) toward the locking position, and
`a releasing member which is(6) being rotated integrally with the reel and
`moves(2) for moving the braking member (4) toward the releasing position
`in response to a reel chucking action of thea reel drive means (11) of a tape
`drive, and
`
`wherein the braking member (4) is provided with a braking gear
`which is(42) comprising gear teeth being adapted to be engaged, to restrict
`rotation of the reel, with anat least one engagement gear tooth on(29) of an
`engagement projection (27) formed on the reel, and
`
` (2), characterized in that each of the gear teeth of the braking gear
`has(42) comprises a first inclined surface which is brought into abutment
`against the engagement gear teeth when the reel is rotated in the(42a) being
`directed towards a tape-unwinding direction with the braking gear and the
`engagement gear tooth in mesh with each other(U) and a second inclined
`surface which is brought into abutment against the engagement gear teeth
`when the reel is rotated in the tape(42b) being directed towards a tape-
`SONY Exhibit 1025
`SONY v. FUJI
`
`1
`
`
`
`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 (W), wherein an
`interior angle ((cid:302)) between the first inclined surface (42a) and thea vertical
`being not larger(s) is smaller than thean interior angle((cid:533)) between the second
`inclined surface (42b) and the vertical. (s).
`
`2
`
`
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