초록 ▼

A magnetic tape cartridge is constructed by rotatably housing a reel having magnetic tape wound therearound within a cartridge case. The cartridge case is constructed by an upper case and a lower case. The cartridge case has a tape extraction opening in a side wall thereof. The upper case and the

A magnetic tape cartridge is constructed by rotatably housing a reel having magnetic tape wound therearound within a cartridge case. The cartridge case is constructed by an upper case and a lower case. The cartridge case has a tape extraction opening in a side wall thereof. The upper case and the lower case are fixed by welding at an abutment surface P, where the upper case and the lower case abut each other. In addition, vertically extending ribs that alternately extend up and down beyond the abutment surface P are provided on the inner surfaces of the side walls of the upper case and the lower case in the vicinity of the opening. By this construction, the strength of the cartridge case in the vicinity of the opening is improved, thereby preventing damage thereto even when the magnetic tape cartridge is dropped or the like.

대표청구항 ▼

What is claimed is: 1. A magnetic tape cartridge comprising: a cartridge case formed of an upper case and a lower case; a single reel rotatably housed within the cartridge case; a magnetic tape wound around the single reel; and a tape extraction opening provided on a side wall of the cartridge ca

What is claimed is: 1. A magnetic tape cartridge comprising: a cartridge case formed of an upper case and a lower case; a single reel rotatably housed within the cartridge case; a magnetic tape wound around the single reel; and a tape extraction opening provided on a side wall of the cartridge case, wherein the cartridge case is integrated by abutment surfaces of the upper case and the lower case which are welded to each other; and vertically extending ribs that extend over the abutment surfaces are provided on the inner surfaces of the side walls of the upper case and the lower case, such that the vertically extending ribs cross over a meeting point of the abutment surfaces, wherein the magnetic tape cartridge is configured such that before the cartridge case is integrated, and the upper case is separated from the lower case, at least one of the vertically extending ribs is fastened to the upper case and extends towards the lower case, and at least another one of the vertically extending ribs is fastened to the lower case and extends towards the upper case. 2. A magnetic tape cartridge as defined in claim 1, wherein the tape extraction opening is formed across the upper case and the lower case. 3. A magnetic tape cartridge as defined in claim 1, wherein the upper case and the lower case are formed from synthetic resin; and the abutment surfaces are welded by ultrasonic welding. 4. A magnetic tape cartridge as defined in claim 1, wherein the ribs are provided such that: one of the upper case and the lower case is provided with a first rib; and the other of the upper case and the lower case is provided with two ribs that sandwich the first rib therebetween. 5. A magnetic tape cartridge as defined in claim 1, wherein the ribs are provided such that lateral surfaces of adjacent ribs are welded to each other. 6. A magnetic tape cartridge as defined in claim 5, wherein portions of the ribs that extend beyond the abutment surfaces are welded to the side walls of the case into which the ribs extend. 7. A magnetic tape cartridge as defined in claim 1, wherein portions of the ribs that extend beyond the abutment surfaces are welded to the side walls of the case into which the ribs extend. 8. A magnetic tape cartridge as defined in claim 1, wherein the vertically extending ribs contact each other when the cartridge case is integrated. 9. A magnetic tape cartridge as defined in claim 1, wherein the vertically extending ribs are provided on a same side of the magnetic tape cartridge.