A disc cartridge accommodating an optical disc in a cartridge body. This disc
cartridge
is provided with a cartridge body formed by mating and joining a pair of upper
and lower halves formed at the circumferential edges with rising circumferential
walls which are mated to each other to constitute the circumferential side walls
and, at the same time, formed at facing inner surfaces with walls for forming the
accommodating portion which are mated to each other to constitute the disc accommodating
portion in which the optical disc is accommodated. This cartridge body is provided
with openings for recording and reproduction and a shutter member for opening and
closing these openings. On the two sides of the cartridge body on the lower half
from the front side toward the middle toward the back side are provided recess
portions for preventing erroneous loading. A plurality of fusing portions for mating
and fusing the upper and lower halves are provided at positions corresponding to
these recess portions.
Each fusing portion for mating and fusing the upper and lower halves is provided
with a mating projection formed at one of the upper and lower halves and a mating
projection formed at the other. A plurality of mating projections formed at either
half comprise mating projections having projections for fusing annularly and continuously
formed over the entire circumference of the end surfaces to be mated to the mating
projections of the other half and mating projections having projections for fusing
formed in the form of an arc in one part of the end surfaces.
