US 6,685,123 B2Granted

Magnetic tape cartridge

AssigneeFuji Photo Film Co., Ltd.

InventorsSeiji Tsuyuki, Hideaki Shiga, Daisuke Takahashi, Yusuke Ishihara

Life of this patent

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Abstract

A magnetic tape cartridge including a reel-rotation restraining member which restricts rotation of a reel when not used and allows the rotation of the reel when used. The reel-rotation restraining member has a restraining member, an urging member, and an unlocking member. The restraining member has a restraining gear which meshes with a locking tooth portion, and the restraining member is supported by a support portion of the cartridge case. In the magnetic tape cartridge, the following relationship is met: b≦(2×a×c)/d where “a” represents the length of engagement between the restraining member in an unlocked state and the support portion, “b” represents the clearance between the restraining member and the support portion, “c” represents the space between the tooth of the restraining gear and the locking tooth portion, and “d” represents the outside diameter of the restraining gear.

Claims2

Dependent claims

A magnetic tape cartridge comprising:

a cartridge case where a single reel with magnetic tape wound thereon is rotatably housed;
and
reel-rotation restraining means which, when not used, goes to a locked state to restrict rotation of said reel and, when used, goes from said locked state to an unlocked state to allow said rotation;
said reel-rotation restraining means having a restraining member for restricting rotation of said reel by moving toward or away from said reel, an urging member for urging said restraining member in a restraining direction, and an unlocking member for moving said restraining member in an unlocking direction, by rotating integrally with said reel and moving according to a chucking operation of rotation means of a drive unit;
wherein said restraining member has a restraining gear which meshes with a locking tooth portion formed in said reel to restrain rotation of said reel;
and
a tooth of said restraining gear has two inclined faces which have an apex angle and interior angles, said apex angle being between an apex angle of the locking tooth portion of said reel and 90 degrees, and said interior angles being 30 degrees or greater with respect to a vertical line and also being approximately the same.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/208,031Filed 31 Jul 2002 · division
Priority: JP 2000/1034315 Apr 2000
Published: US 2002/0185563 A112 Dec 2002
Granted: 3 Feb 2004
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

G11B 23/107
For housing webs or filaments having two distinct ends: using one reel or core, one end of the record carrier coming out of the magazine or cassette
G11B 23/043
Details: brakes for tapes or tape reels
G11B
Information storage based on relative movement between record carrier and transducer

Family

Application09/825,943Parent of this division · filed 5 Apr 2001
US 2002/0185563 A1Pre-grant publication · published 12 Dec 2002
US 6,499,686 B2Parent of this division
US 2001/0028010 A1Published application
US 6,685,123 B2This patent

From the US filing history. Foreign family members aren’t listed.