JP2842435B2 - Disk cassette - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case in which a disk having a signal recording surface is rotatably accommodated, and a shutter is slidably mounted on the case. And a disk cassette in which a head insertion hole is opened and closed. 2. Description of the Related Art A disk 1 having a signal recording surface as shown in FIGS. 8 to 10 as a disk cassette, a case 2 accommodating the disk 1 rotatably, and a case 2 Shutter 3 for opening and closing the inserted head insertion hole 2a
And a shutter spring 7 for urging the shutter 3 toward the closed position of the head insertion hole 2a. The shutter 3 is slidable in parallel with the front end face 2b of the case 2. The overlapping piece 3a and a pair of shutter plate portions (case holding pieces) 3b and 3c provided so as to be continuous with the overlapping piece 3a at the front end of the case are formed in a U-shape in cross-section. The sliding guide projection 4 is provided, and the sliding guide projection 4 is fitted into a guide groove (sliding guide groove) 5 provided in the case 2 so that the shutter 3 is moved along the guide groove 5. Can be slid. The shutter spring 7 has a coil portion 7a and a pair of arms 7b and 7c. The tip of one arm 7b is locked in the case 2 and the tip of the other arm 7c. Are locked to the shutter 3 to urge the shutter 3 in a direction to close the head insertion hole 2a. When the shutter 3 is slid against the spring force of the shutter spring 7, the notch 6 provided in the shutter 3 overlaps with the position of the head insertion hole 2a provided in the case 2 so as to overlap. , The head insertion hole 2
a is in a so-called open state. The above-mentioned conventional disk cassette has the following problems. (1) Shutter plate 3 of shutter 3
Since the slide guide projections 4 are provided on the inner surfaces of the b and 3c, when the shutter 3 is attached to the case 2, that is, when the case 2 is inserted between the shutter plate portions 3b and 3c of the U-shaped shutter 3, The guide projections 4 hinder insertion. (2) When the shutter 3 is mounted on the case 2, the opening of the shutter 3 or the shutter plates 3b and 3c are pushed open by the guide projections 4, so that the shutter plates 3b and 3c of the case 2 The degree of adhesion to the upper and lower surfaces is deteriorated, which causes dust to enter. (3) The slide guide projections 4 are provided on the shutter plate portions 3b and 3c.
Since b and 3c are relatively easy to spread, the guide projections 4 easily come out of the guide grooves 5. (4) Since the tip of the other arm 7c of the shutter spring 7 is locked in a state of being in contact with the spring contact portion of the shutter 3, the other arm is opened and closed when the shutter 3 is opened and closed. The tip of the shutter 7c is easily detached from the spring contact portion of the shutter 3. The present invention has been made to solve the above-mentioned conventional problems. SUMMARY OF THE INVENTION The present invention is directed to a polymer having a pair of head insertion holes for accommodating a disk rotatably and exposing the disk provided on the upper and lower surfaces of the disk to face each other. A case formed of a material, a case front end overlapping piece slidable in parallel to the front end surface of the case, and a pair of shutters for opening and closing the pair of head insertion holes provided in connection with the case front end overlapping piece. A shutter having a U-shaped cross section having a plate portion, a coil portion and a pair of arms, one end of the pair of arms is locked in the case, and the other end is connected to the shutter. And a shutter spring that is locked and biases the shutter in a direction to close the pair of head insertion holes with the pair of shutter plate portions. A sliding guide projection is formed on a surface of the front end piece of the case integrally with the front end polymer piece with a polymer material, and is engaged with a guide groove provided on the front end face of the case. By providing a spring locking portion having a groove and locking the other arm portion of the shutter spring, the sliding guide protrusion does not hinder insertion (attachment) of the shutter into the case, and The sliding guide protrusion can be fitted into the guide groove provided on the front end surface of the case without pushing and expanding the pair of shutter plate portions, and the other arm portion of the shutter spring is provided with the spring receiving groove. And is locked by a spring locking portion having. Next, the present invention will be described with reference to FIGS. Reference numeral 11 denotes a disk cassette of the present invention. The disk cassette 11 includes a disk 12 having a signal recording surface, a case 13 rotatably housing the disk 12, and upper and lower surfaces of the case 13. A shutter 14 for opening and closing the head insertion hole 13a, and a shutter spring 21 for urging the shutter 14 in a direction to close the head insertion hole 13a. As shown in FIG. 7, the disk 12 is formed in a disk shape. A magnetic recording surface is provided on both sides of the disk 12, and a center hub receiving hole 12a is formed in the center. A center hub 15 is attached to the receiving hole 12a. The case 13 is divided into an upper shell 13b provided with a head insertion hole 13a and a lower shell 13c. The upper shell 13b and the lower shell 13c are formed of a polymer material. A hub receiving hole 13d for exposing the center hub 15 is provided at the center of the lower shell 13c, and the inner surface is formed on the inner surface. Are attached with felts (liners) 16 for preventing wear of the disk 12 and generation of static electricity and the like. Then, these felts 16 and 16 are used for disc 1.
2 and the upper shell 13b and the lower shell 13c
The case 13 is formed by overlapping and welding the end walls 13e provided on the peripheral edge of the case 13 and a sliding guide projection of a shutter 14 described below is inserted into the front end surface of the case 13. Guide grooves are provided. The shutter 14 includes a case front end overlapping piece 14a slidable in parallel with the front end face of the case 13;
A pair of shutter plate portions 14b, 14c for opening and closing the pair of head insertion holes 13a, 13a provided in connection with the case front end overlapping piece 14a are formed in a U-shaped cross section. The case front end overlapping piece 14a and the pair of shutter plates 14b and 14c are formed of a polymer material having a small friction coefficient and excellent wear resistance, and are formed from an opening facing the case front end overlapping piece 14a. When the front end face of the case 13 is inserted, the case front end overlapping piece 14a overlaps with the front end face of the case 13 and the pair of shutter plates 14b, 14c
b and the lower shell 13c. The front end overlapping piece 1 of the case of the shutter 14
A slide guide projection 17 made of a polymer material is provided on the inner surface of 4a. The sliding guide projections 17 are formed integrally with the case front end overlapping piece 14a on both sides in the longitudinal direction of the case front end overlapping piece 14a, and when the front end side of the case 13 is inserted into the shutter 14. The shutter 14 is slidably fitted to the case 13 by fitting into a guide groove 18 provided on the front end surface of the case 13. The slide guide projection 17 is formed integrally with the inner surface of the case front end overlapping piece 14a. As shown in FIG. 4, the sliding guide projection 17 is
It has a drop-off prevention projection 17b made of a polymer material for preventing the release from the guide groove 18. The drop-off prevention protrusion 17b is formed integrally with a side surface of the slide guide protrusion 17 by a polymer material, and is engaged with a lower end of the guide groove 18 as shown in FIG. The slide guide projection 17 is prevented from coming off from the guide groove 18. The sliding guide projection 17 integrally has, at its tip in the direction of insertion into the guide groove 18, an insertion slope 17c of a polymer material for facilitating insertion into the guide groove 18. ing. The insertion slope portion 17c is formed by inclining a tip surface of the drop prevention protrusion 17b on the insertion direction side into the guide groove 18. As shown in FIG. 4, the sliding guide projection 17 has a reinforcing rib 19 at one end and a spring receiving groove 22 at the other end.
Has a spring locking portion 20 for locking the other arm portion 21c. As shown in FIG. 3, the shutter spring 21 includes a coil portion 21a and a pair of first and second arm portions 21b and 21 connected to both ends of the coil portion 21a.
and a pair of spring accommodating portions 2 formed on both sides of the guide groove 18 in the case 13.
3 respectively. The shutter spring 21 is configured such that one arm 21b of the pair of arms 21b and 21c is
And the other arm portion 21 c is locked by a spring locking portion 20 provided on the sliding guide projection 17.
Then, a pair of shutter springs 21 and 21 housed in the pair of spring housing portions 23 and 23, respectively.
1, as shown in FIG. 1, the shutter 14 is set at the center of a shutter mounting recess (shutter slide area) 13 f provided in the case 13, and a non-notched portion 14 d of the shutter 14 is used for a head insertion hole 13 a. When the shutter 14 is slid left and right against the spring force of the shutter springs 21 and 21, the notches 1 provided on both sides of the non-notch 14d are provided.
4f and 14f overlap the head insertion hole 13a to open the hole 13a. The disk cassette 11 of the embodiment has the above-described configuration, and is provided with the front end face side of the case 3 (the guide groove 18).
Is inserted toward the case front end overlapping piece 14a of the shutter 14, the case front end overlapping piece 14a
The insertion slope 17c at the tip of the slide guide projection 17 provided on the inner surface of the groove contacts the peripheral edge of the guide groove 18, and the slope 1
7c, the gap between the upper and lower shells 13b, 13c is pushed open, and the guide groove 18 is cut open so that the slide guide projection 17 fits into the guide groove 18,
When the drop-off prevention projection 17 penetrates the guide groove 18, the upper and lower shells 13b and 13c return to their original positions, and the lower end of the guide groove 18 is placed in the drop-out prevention projection 1.
The shutter 14 is slidably attached to the case 13 in a state where the shutter 14 can be engaged with the shutter 7 and is prevented from coming off. Next, shutter springs 21 are respectively inserted into the spring accommodating portions 22 and 222 from both ends of the guide groove 18, respectively, and one arm portion 21b of the shutter spring 21 is locked to the case 13, When the other arm portion 21c is locked to the spring locking portion 20 having the spring receiving groove 22 provided in the slide guide projection 17, the shutter 14 is moved by the pair of shutter springs 21 and 21 as described above. Case 1
3 is set at the center of the shutter mounting recess 13f. When the shutter 14 is slid left and right against the spring force of the shutter springs 21 and 21,
The notches 14f provided on both sides of the non-cut portions 14d of the shutter plate portions 14b and 14c overlap the positions of the head insertion holes 13a provided in the case 13 to open the head insertion holes 13a. The disk cassette of the present invention has the following effects. (1) A slide guide projection is formed integrally with the above-described case front end polymer piece from a polymer material on the inner surface of the case front end polymer piece, and the slide guide protrusion is inserted into a guide groove provided on the front end face of the case. When the shutter is inserted into the case, the sliding guide projection does not hinder the insertion, and when the case is inserted between the pair of shutter plate portions of the shutter, the sliding guide projection automatically comes into contact with the case. The shutter is attached to the case by fitting into the guide groove provided on the end face. (2) When inserting the shutter into the case, the opening of the shutter or the case holding piece is not pushed and spread by the sliding guide projection. (3) Since the overlapping piece on the end face of the case is less likely to be deformed than the shutter plate portion, the sliding guide projection is less likely to fall out of the guide groove, and the joint strength between the case and the shutter should be improved. Can be. (4) Since the spring engaging portion having the spring receiving groove is provided on the sliding guide projection, the other arm portion of the shutter spring can be easily and reliably engaged with the spring engaging portion.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a bottom view of a disk cassette according to the present invention. FIG. 2 is an enlarged view of a shutter portion of FIG. FIG. 3 is a partially broken sectional view of a main part. FIG. 4 is an enlarged perspective view of a main part. FIG. 5 is a sectional view of a main part. FIG. 6 is a side view of a main part. FIG. 7 is an exploded perspective view. FIG. 8 is a conventional plan view. FIG. 9 is a bottom view of the same. FIG. 10 is an explanatory view showing an attached state of a shutter spring. [Description of Signs] 11 ... Disc cassette, 12 ... Disk, 13 ... Case, 14 ... Shutter, 14a ... Case front end overlapping piece, 1
4b, 14c: shutter plate portion, 17: sliding guide projection, 18: guide groove, 20: spring locking portion, 21:
Shutter spring, 21a ... coil part, 21b, 2
1c: a pair of arms, 22: a spring receiving groove.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G11B 23/03 605

Claims (1)

(57) [Claims] A case made of a polymer material having a pair of head insertion holes for exposing the disks, which are provided on the upper and lower surfaces of the disks so as to be rotatable and which are respectively opposed to the upper and lower surfaces of the disks. A shutter having a U-shaped cross section, comprising: a case front end overlapping piece slidable on the front end; and a pair of shutter plate portions provided to be connected to the case front end overlapping piece to open and close the pair of head insertion holes; And a pair of arm portions. One end of the pair of arm portions is locked in the case, and the other end portion is locked by the shutter. A disc spring having a shutter spring for urging the shutter in a direction in which the front end polymer piece is formed integrally with the front end polymer piece with a polymer material on the inner surface of the case front end polymer piece. A sliding guide protrusion engaged with and guided by a guide groove provided on a front end surface of the case; a spring receiving groove provided on the sliding guide protrusion and the other arm of the shutter spring; A disk cassette, comprising: a spring locking portion for locking the portion.