Reel spring for use of a magnetic tape cassette and a magnetic tape cassette
AssigneeFuji Photo Film Co., Ltd.
InventorsAkihisa Kita, Tatsuya Yamaguchi
Life of this patent
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Abstract
The reel spring for use in a magnetic tape cassette comprises a fixing portion which is fixed to a boss of a cassette case by means of a boss hole, an arm portion which forces a reel in an axial direction of rotation and a bending portion provided between the fixing portion and the arm portion in an L-like shape. The ratio of a length of the fixing portion of the reel spring to a height of the boss is 4.0 or more. The length of the fixing portion is longer than that of the arm portion by 1 mm to 5 mm. The magnetic tape cassette employs the reel spring which is capable of enhancing production efficiency in fabricating the magnetic tape cassette while maintaining a specified force of the reel spring.
Claims9
A reel spring for use in a magnetic tape cassette having a cassette case and a pair of reels wound with a magnetic tape and rotatably provided in said cassette case, said reel spring for forcing one of said pair of reels in an axial direction of rotation, comprising:
- a fixing portion for being fixed to said cassette case, said fixing portion having a boss hole for being engaged to a boss of the cassette case;
- an arm portion which forces on said one of said reels in the axial direction of rotation;
- and
- a bending portion to form an L-like shape provided between said fixing portion and said arm portion,
- wherein a ratio of a length of said fixing portion to a height of the boss is equal to or more than 4.0, and
- wherein said length of said fixing portion is longer than a length of said arm portion by from 1 mm to 5 mm.
A magnetic tape cassette, comprising:
- a cassette case;
- a pair of reels wound with a magnetic tape and rotatably provided in said cassette case;
- and
- a pair of reel springs disposed to the cassette case for forcing each of the pair of reels in an axial direction of rotation, said cassette case having a pair of bosses for disposal of the pair of reel springs, each of said pair of reel springs comprising:
- a fixing portion for being fixed to said cassette case, said fixing portion having a boss hole for being engaged to one of the pair of bosses of the cassette case to form a fixing end when said fixing portion is fixed to said cassette case;
- an arm portion for forcing on each of said reels in the axial direction of rotation;
- and
- a bending portion to form an L-like shape provided between said fixing portion and said arm portion,
- wherein a ratio of a length of said fixing portion to a height of the boss is equal to or more than 4.0, and
- wherein said length of said fixing portion is longer than a length of said arm portion by from 1 mm to 5 mm.
Dependencies are inferred from the claim text.