JPS63119081A - Disk cassette - Google Patents

Abstract

PURPOSE:To open a head insertion hole by providing a notch at both sides of a shutter around a part not notched of the shutter and aligning the shutter by a set spring so that the notch comes onto the head insertion hole thereby sliding the shutter in both the left/right directions. CONSTITUTION:So long as a special external force is not exerted to the shutter 14, the shutter 14 is set while the head insertion hole 13a is closed by the non- notch part 14b by means of the spring force of the set spring 15. In sliding the shutter 14 in a direction against the spring force of the set spring 15 from the state, the notch 14a provided to one side of the non-notch part 14b is overlapped onto the head insertion hole 13a to open head insertion hole 13a, and in sliding the shutter 14 in the other direction, the notch 14a provided to the other side of the non-notch part 14b is overlapped on the head insertion hole 13a to open the head insertion hole 13a.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is directed to a case in which a shutter is slidably attached to a case rotatably housing a disk having a signal recording surface, and a notch provided in the shutter and a Regarding disk cassettes in which the head insertion hole of the case is opened and closed by a notch, in particular, by forming notches on both sides of the shutter, the head can be inserted even when the shutter is slid not only in one direction but also in the other direction. The hole can be opened.

[Summary of the Invention] A disk having a signal recording surface, a case that rotatably houses the disk and has head insertion holes on the upper and lower surfaces, and a case that is slidably attached to the case,
The shutter includes a notched portion and a non-notched portion for opening and closing the head insertion hole, and a set spring that positions the non-notched portion of the shutter over the head insertion hole, and the shutter is provided with a spring force of the set spring. In a disk cassette in which the head insertion hole is opened by sliding the shutter against the resistance, the shutter is provided with notches symmetrically on both sides of the non-cutout part, and By positioning the shutter with a set spring so that the non-notched part is located above the head insertion hole, when the shutter is slid in one direction against the spring force of the set spring, one notch part is positioned above the head insertion hole. When the shutter is slid in the other direction, the other notch overlaps the head insertion hole, so that the head insertion hole can be opened not only by sliding the shutter in one direction but also in the other direction. I made it.

[Prior Art] As shown in FIGS. 5 to 7, a disk cassette includes a disk l having a signal recording surface, rotatably housing the disk l, and having head insertion holes 2a on the upper and lower surfaces. a case 2, a shutter 3 which is slidably attached to the case 2 and has a notch 3a and a non-notch portion 3b for opening and closing the head insertion hole 2a; and a set spring 4 positioned above the head insertion hole 2a, the set spring 4
Slide the shutter 3 against the spring force of the notch 3b.
By positioning the head insertion hole 2a over the head insertion hole za, the head insertion hole 2a is opened.

[Problems to be Solved by the Invention] By the way, in the above-mentioned conventional disk cassette, a non-cutout portion 3b is provided on one side of the shutter 3, a cutout portion 3a is provided on the other side, and the case 2 is provided with a non-cutout portion 3b. Since the set spring 4 was pressed against one side of the shutter mounting recess 2b, the following problems occurred.

(1) To open the head insertion hole 2a, use the shutter 3.
must be pushed back to the other side of the shutter mounting recess 2b against the spring force of the set spring 4,
The sliding direction of the shutter 3 for opening the shutter insertion hole 2a is restricted.

(2) When signal recording surfaces are provided on the top and bottom surfaces of the disc I, when using the signal recording surface on the top side, the shutter 3
When using the lower signal recording surface, the shutter 3 must be slid in the other direction.
The structure of the shutter opening/closing mechanism provided in the disk drive becomes complicated.

(3) It is possible to attach the shutter 3 to the case 2 with the wrong front and back sides.

The present invention has been made for the purpose of solving the above-mentioned conventional problems.

[Means for solving the problem] The shutter is provided with notches on both sides of the non-notched part, and a spring is used to set the shutter so that the non-notched part is located above the head insertion hole. I positioned it.

[Operation] Due to the spring force of the set spring, the shutter is positioned in the non-notched portion with the head insertion hole closed. Then, from this state, if the shutter is slid in one direction against the spring force of the set spring, the notch provided on one side of the non-notched portion overlaps the head insertion hole, and the head insertion hole When the shutter is opened and the shutter is slid in the other direction, the notch provided on the other side of the non-cutout portion overlaps the head insertion hole, opening the head insertion hole. Therefore, even when signal recording surfaces are provided on the upper and lower surfaces of the disk and the disk is used upside down, the head insertion hole can be opened by sliding the shutter in the same direction as when using the front side of the disk.

[Example code] Next, the present invention will be explained with reference to FIGS. 1 to 4.

1 is a disk cassette of the present invention, and the disk cassette 11 includes a disk 12 having a signal recording surface and a case rotatably housing the disk 12 and having head insertion holes 13a on the upper and lower surfaces. 13, a shirt cover 14 which is slidably attached to the case 13 and has a notch 14a and a non-cutout part 14b for opening and closing the head insertion hole 13a, and the non-cutout part 14 of the shutter 14.
A set spring 15 is provided, and a set spring 15 is positioned above the head insertion hole 13a.

The disk 12 is made of a flexible polymer material and is shaped like a disk. Magnetic recording surfaces are provided on both sides thereof, and a center hub receiving hole 12a is provided in the center, and a center hub 16 is attached to the receiving hole 12a.

The case 13 is divided into an upper shell 13b having a head insertion hole 13a and a lower shell 13c. The upper shell 13b and the lower shell 13c are made of a hard polymer material, and the lower shell 13c is provided with a hub receiving hole 13d in the center to expose the center hub 16, and has an inner surface. A felt 17.17 is attached to the disc II to prevent wear and static electricity generation. The case 13 is formed by sandwiching the disk 12 between these felts 17 and 17, overlapping the end walls 13e provided at the periphery of the upper shell 13b and the lower shell 13c, and welding them together. .

Further, the shutter 14 includes a case end face overlapping piece 14c,
Case clamping pieces 14d and 14e connected to both ends of the case end face overlapping piece 14c form a U-shaped cross section, and a non-cut portion 14b is provided at the center of the case clamping pieces 14d and 14e. Notches 14a, 14 on both sides thereof
A is provided. These case end face overlapping pieces 14c and case clamping pieces 14d and 14e have a small coefficient of friction.
It is integrally molded from a polymer material with excellent wear resistance. Then, one end of the case 13 is inserted through the opening facing the case end face overlapping piece 14c, and a sliding guide protrusion (not shown) provided on the inner surface of the shutter 14 is inserted into a sliding guide groove (not shown) provided in the case 13. (not shown), the shutter 14 is slidably attached to the shutter mounting recess 13f of the case 3.
When positioned at the center of f, the non-cutout portion 14b closes the head insertion hole 13a.

Furthermore, beam-shaped torsion springs are used in the set spring 5 and are respectively attached to spring housing portions 18 and 18 provided on both sides of the case 13. One end side 15a of these set springs 15 is bent at an acute angle to prevent the sharp end from getting caught on or scraping the inner peripheral surface of the spring accommodating portion I8, and the other end side 15
b is engaged with a spring locking portion 14f provided at the end of the shutter 14, and the spring force presses both ends of the shutter 14 approximately equally, and the non-notched portion 14b at the center of the shutter 14 is pressed against the head. It is positioned above the insertion hole 13a. Note that 19 is a recess in the model for positioning the set spring 15. The recess 19 is formed in the end wall 13e of the case 13, and when the set spring 15 is extended, the tip of the one end side 15b of the recess 19 is formed in the end wall 13e of the case 13. is fitted to position the coil spring 15.

Since the disk cassette 11 of the embodiment has the above-described configuration, unless a special external force is applied to the shutter 14, the shutter 14 closes the head insertion hole 13a with the non-notched portion 14b due to the spring force of the set spring 15. is set to . From this state, set spring 15
When the shutter 14 is slid in one direction against the spring force of
When the shutter 14 is opened and the shutter 14 is slid in the other direction, the notch 14a provided on the other side of the non-cutout part 14b overlaps the head insertion hole 13a, opening the head insertion hole 13a. .

[Effects of the Invention] As explained above, the present invention provides the shutter with notches on both sides of the non-cutout portion, and the shutter is arranged such that the non-cutout portion is located above the head insertion hole. Positioning is done using a set spring, which has the following effects.

(1) It becomes possible to open the head insertion hole by sliding the shutter in both left and right directions.

(2) Signal recording surfaces are provided on the upper and lower surfaces of the disk, and even when using these upper and lower signal recording surfaces, the head insertion hole can be opened by sliding the shutter in the same direction, so the disk drive device The structure of the shutter opening/closing mechanism provided in the can be simplified.

(3) Since the notches are symmetrically provided on both sides of the non-cutout part, the shutter can be attached to the case regardless of the front or back side, eliminating installation errors and improving installation work efficiency. can.

Fig. 2 is an enlarged view of the shutter part in Fig. 1, Fig. 3 is a partially cutaway view of the main part, Fig. 4 is an exploded perspective view, Fig. 5 is a plan view of the conventional example, and Fig. 6 is the same. The bottom view and FIG. 7 are explanatory diagrams showing the installed state of the set spring.

11... Disk cassette, 12... Disc, 1
3... Case, 13a... Head insertion hole, 14...
-Shutter, 14a...notch part, 14b...non-notch part, 15...set spring.

The tree is shining brightly, and it is a prisoner. Figure 1 Minute N diagonal hood plan Figure 4 50th Figure 6

Claims (1)

[Claims] (1) A disk having a signal recording surface, a case that rotatably houses the disk and has head insertion holes on the top and bottom surfaces, and a case that is slidably attached to the case and the head In a disc cassette, the shutter includes a shutter having a cutout portion and a non-cutout portion for opening and closing the insertion hole, and a set spring that positions the non-cutout portion of the shutter over the head insertion hole, the shutter having a non-cutout portion. A disk cassette characterized in that notches are provided symmetrically on both sides of the notch, and a shutter is positioned by a set spring so that the non-notched part is located above the head insertion hole.