Claims
- 1. A cartridge case for encasing therein a recording medium disc, said cartridge being made of plastic and having a front edge;
- a shutter slidably mounted on said cartridge case for opening and closing at least one head insertion hole formed in said cartridge case, said shutter including a head portion slidingly movable along said front edge of said cartridge, said head portion having opening and closing plate portions extending from both sides thereof;
- a guide portion formed in said front edge of said cartridge case in an insertion direction toward a recording and reproducing apparatus;
- a slider slidingly engaged with said guide portion for supporting said shutter; and
- a return coil spring, for biasing said shutter through said slider to a position where said shutter closes said head insertion hole, provided in a receiving space at a corner of the cartridge case, wherein said return coil spring comprises an elastic wire coiled portion and two arms extend from said coiled portion, one of the arms including a first extension portion extending substantially along a circumferential periphery of the disc from said coiled portion and a second extension portion bent from said first extension portion along a front wall in the insertion direction of the recording and reproducing apparatus for the cartridge, said second extension portion having a longitudinal portion extending along the front wall, a laterally extending portion bent back from the longitudinal portion and a retainer portion engaged with an end portion of the slider and bent at a right angle from the laterally extending portion, a distal end of said second extension portion being engaged with a tip end of said slider, and the other arm includes a third extension portion extended from said coiled portion toward the front wall and a fourth extension portion bent from said third extension portion toward the front wall of said cartridge, case, said fourth extension portion having a trapezoidal crest shape cooperating with the third engaging with an end wall of the cartridge, said retainer portion of the fourth extension portion being extended in a direction opposite to that of said retainer of the second extension portion, a distal end of said fourth extension portion being engaged with the front wall of said cartridge case.
- 2. A disc cartridge according to claim 1, wherein a radius of curvature of a bent portion between said third extension portion and said fourth extension portion is in the range of 0.8 to 3 mm.
Priority Claims (5)
Number |
Date |
Country |
Kind |
63-56766 |
Apr 1988 |
JPX |
|
63-56767 |
Apr 1988 |
JPX |
|
63-56768 |
Apr 1988 |
JPX |
|
63-56772 |
Apr 1988 |
JPX |
|
63-85101 |
Jun 1988 |
JPX |
|
Parent Case Info
This is a division of application Ser. No. 07/835,065, filed Feb. 18, 1992, now abandoned, which in turn is a continuation of application Ser. No. 07/344,580, filed Apr. 28, 1989, now abandoned.
US Referenced Citations (16)
Foreign Referenced Citations (6)
Number |
Date |
Country |
0244132 |
Nov 1987 |
EPX |
0248908 |
Dec 1987 |
EPX |
0264237 |
Apr 1988 |
EPX |
57-154685 |
Sep 1982 |
JPX |
63-046669 |
Feb 1988 |
JPX |
63-269385 |
Nov 1988 |
JPX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
835065 |
Feb 1992 |
|
Continuations (1)
|
Number |
Date |
Country |
Parent |
344580 |
Apr 1989 |
|