| 摘要 |
The present invention relates to a magnetic tape cartridge comprising a cartridge casing and a single reel around which a magnetic tape is wound and which is contained in the cartridge casing for rotation, said cartridge casing is provided with a tape outlet opening for extracting the magnetic tape, and said tape outlet opening is provided with an opening and closing slide door, wherein said slide door is provided with an opener portion that abuts against the door opening member of the record and playback apparatus to move said slide door in the opening direction, and a lock portion that engages with an engaging portion of said cartridge casing to lock said slide door in the closed position, and is brought into abutment with the door opening member of the record and playback apparatus to unlock the engaging portion; wherein a slit groove is formed at each of an upper-end portion and a lower-end portion of a base of the opener portion so that the base of the opener portion has lowered stiffness enabling resilient transform thereof, and wherein a portion between the lock portion and a lead end of the opener portion is inclined so as to project forward.
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