JPH0617229Y2 - Disc cartridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a disk cartridge for housing a disk, which is a recording medium such as an optical disk or a magnetic disk.

[Conventional technology]

Generally, a floppy disk or an optical disk is housed in a cassette housing consisting of two upper and lower shells, and a rotation hole (motor access) for inserting a turntable for rotating the disk is provided at the center of the cassette housing. In addition, a head insertion hole (Head access) into which the read / write head is inserted is provided so as to cross the recording surface of the disk.

Such a disk cartridge is disclosed in, for example, Shokai Sho 59-17
As disclosed in Japanese Patent Publication No. 7073, as shown in FIG. 6, this cartridge has a shell 50 accommodating a disk d, and a rotation hole 51 is provided at the center of this shell 50. Has a suction plate 52 provided in the center of the disk d, and a turntable (not shown) on the recording / reproducing apparatus side is suctioned to the suction plate 52.

The head insertion hole 53 is provided on the insertion side of the cartridge into the recording / reproducing apparatus, and the read / write head is inserted into the head insertion hole 53. This head insertion hole 5
A shutter 54 is openable and closable, and an opening 55 is provided in the shutter 54, and the head insertion hole 53 is opened when the opening 55 is aligned with the head insertion hole 53. The shutter 54 slides on the shell 50. A coil spring 56 is housed in the upper right portion of the shell 50 in the figure, and the coil spring 56 is provided between the shutter 54 and the side end wall of the shell. When the shutter 54 opens the head insertion hole 53, FIG. When the shutter 54 moves to the right in the figure while the coil spring 56 is contracted, the cassette 54 is taken out from the recording / reproducing apparatus and the shutter 54 is opened, as shown in FIG.
The repulsive force of 6 causes the shutter 54 to return.

[Problems to be solved by the device]

The coil spring 56 includes a coil portion 56a and a coil portion 5a.
Since it has a V-shaped structure formed by arms 56b and 56c extending from 6a to the left and right, there is no particular problem when the amplitude of the horizontal movement of the shutter 54 is small, but when the head insertion hole 53 is large like an optical disc. In this case, the shutter 54 must be slid greatly, and in this case the long arm 56b,
56c is required, and the angle θ between the arms 56b and 56c cannot be made too large in order to smooth the spring action. Therefore, the position of the coil portion 56a is largely separated from the upper end wall 50a of the shell 50, and a large dead space is required to house the spring. Moreover, if the shutter 54 is opened up to the vicinity of the tip fixing position P ₀ of the arm 56b, the coil portion 56a collides with the right end wall of the shell 50 and the shutter 54 smoothly moves.
There is a problem that you can not open.

It is an object of the present invention to provide a disk cartridge that can smoothly open and close a shutter in a wide range and can reduce a coil spring storage space.

[Means for Solving the Problems]

Therefore, the present invention is directed to a cartridge housing including upper and lower halves for accommodating a disk as a recording medium, a shutter slidably attached to the cartridge housing for opening and closing a head insertion hole formed in the cartridge housing, and a cartridge. A torsion coil spring for urging the shutter at a position for closing the head insertion hole provided in a corner storage space of the housing, and the torsion coil spring includes a coil portion around which an elastic wire is wound, and the coil. And two arms extending to the left and right from the portion, and when the torsion coil spring is housed in a corner space, the one arm extends from the coil portion along a circular peripheral edge of the disc and a first extension portion. And a second extending portion bent from the first extending portion to the front end wall side in the insertion direction of the cartridge into the recording / reproducing apparatus, and the tip of the second extending portion is the shank. The other arm is extended from the coil portion toward the front end wall, and the third extension portion is bent from the third extension portion toward the side end wall of the cartridge housing and extends. The tip of the fourth extension portion is adapted to engage with the cartridge side end wall.

[Action]

The torsion coil spring provided at the corner of the cartridge includes a coil portion and two arms extending on both sides of the coil portion, one of the two arms being a first extension portion extending from the coil portion substantially along the circular periphery of the disc. , A second extending portion extending from the first extending portion to the front end wall side in the cartridge insertion direction,
The other arm is composed of a third extending portion extending from the coil portion toward the front end wall side, and a fourth extending portion bending from the third extending portion and extending toward the side end wall of the cartridge housing. . Therefore, when the shutter slides to the left and right, the coil portion of the torsion coil spring moves from the substantially central portion of the coil spring housing space in the left-right direction along the peripheral edge of the circular disk toward the side wall of the cartridge, so that the shutter is completely headed. When opening the insertion hole, position it close to the side wall of the cartridge. When the shutter is opened, the coil portion returns to the original position along the same locus.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, for example, an optical disk cartridge C of the present invention forms a cartridge housing 1, and the housing 1 is formed by combining an upper half piece 2 and a lower half piece 3, and a rotation hole is formed in the center of the housing 1. 4 is formed, and this rotation hole 4
The head insertion hole 5 is connected to. A shutter 6 is provided slidably in the left-right direction to open and close the head insertion hole 5, and the lower end of the shutter 6 is guided by a holding plate 8.

Double writing prevention portions 9, 9 are provided on the left and right sides of the rear end of the housing 1 in the insertion direction, and the shutter 6 is bent at the front end of the housing 1 and extends to the back side.

A torsion coil spring 10 is accommodated on the left side of the front end of the housing 1 as shown in FIG. 2, and the accommodation space S of the torsion coil spring 10 is substantially triangular. As shown in FIGS. 2 and 3, the spring 10 includes a coil portion 1 in which an elastic wire is wound.
1 and two arms 1 extending left and right from this coil portion 11
2, 13 and the arm 13 includes the coil portion 11 to the housing 1
The optical disk and the first extending portion 13a extending substantially along the circumferential wall w ₁ provided on the periphery of the (not shown), the first extending portion 1
The second extending me rising from 3a to the cartridge front end wall _{w 2}
Consists extension portion 13b, transverse portion 13b the second extending portion 13b is bent therefrom in the transverse direction as the longitudinal direction portion 13b _1
2, consisting of the locking portion 13b ₃ for engaging the end of the slide 40 for guiding the shutter 6 which is bent at a right angle from the tip of the lateral portion 13b _2. Further, the arm 12 has a third extension portion 1 extending from the coil portion 11 toward the front wall of the cartridge.
2a and a fourth extending portion 12b extending in the lateral direction as a whole from the third extending portion 12a.
Reference numeral 2b denotes chevron forming portions 12b ₁ and 12b ₂ that form chevron shapes on the left side of the third extension portion 12a in the figure, and the chevron forming portions 12b.
A bounce up part 12b ₃ that up bouncing from ₂ tip in the cartridge front end wall w ₂ side, the engaging portion 12b to be engaged with the cartridge end wall w ₃ I breaking song perpendicularly from the distal end of the bounce up portion 12b _{3 It consists of four} .

FIG. 4 is a view from the direction of arrow A in FIG. 2, and in FIG. 4, the slide 40 is a guide rail 2 of the upper and lower half pieces 2 and 3.
0, 21 and the front ends of the upper and lower halves 2, 3 form an opening 0 from which the torsion coil spring 1
0 is inserted at the end of the assembly of the cartridge while one end of the spring 10 is engaged with the slide tip on the side wall w ₃ . That is, the spring locking portion 1 is attached to the slide tip and the side wall w _3.
Storage portions 41, ₄ for detachably storing 2b ₄ , 13b ₃
2 is formed.

When the shutter 6 opens and closes the head insertion hole 5,
As shown in FIG. 5, the center of the coil portion 11 of the spring 10 reciprocates along the locus 13. That is, the coil portion 11 moves along the peripheral edge w ₁ and does not collide with the peripheral wall w ₁ . Further, since the arms 12 and 13 are bent, the coil portion 11 sways in the lateral direction as the slider 40 moves to the left side, so that the lateral distance of the slide 40 increases. Also the opening angle θ ₀ of both arms 12, 13
The decrease in (Fig. 1) is small. Therefore, the slide 40
The spring resistance does not suddenly increase with the movement of the shutter, which ensures a smooth shutter movement. Further, due to the formation of the bent arms, even if the shutter 6 is opened to a position close to the side wall w ₃ , the arm 13 does not abut the side wall w ₃ and interfere with the movement of the slide 40. Even if S is relatively small, it is possible to increase the lateral movement distance of the shutter 6.

[Effect of device]

Since the present invention is configured as described above, the movement of the shutter can be increased even if the storage space for the torsion coil spring is small, and therefore the cartridge can be downsized, and the smooth large opening / closing operation of the shutter can be performed. The effect is guaranteed.

[Brief description of drawings]

FIG. 1 is a perspective view of a cartridge of the present invention, FIG. 2 is a plan view of a torsion coil spring accommodating portion, FIG. 3 is a perspective view of a torsion coil spring, and FIG. 4 is a view taken along arrow A of FIG. 5 is an explanatory view of the action of the torsion coil spring, FIG. 6 is a plan view of a conventional magnetic cartridge, and FIG. 7 is a plan view of the magnetic cartridge of FIG. 6 when the shutter is opened. 1 ... Cut ridge, 5 ... Head insertion hole, 6 ... Shutter, 10 ... Torsion coil spring, 11 ... Coil part, 1
2,13 ... arms, 40 ... slides.

Claims (1)

[Scope of utility model registration request] 1. A cartridge housing including upper and lower halves for accommodating a disk as a recording medium, a shutter slidably attached to the cartridge housing for opening and closing a head insertion hole formed in the cartridge housing, and a cartridge. And a torsion coil spring for urging the shutter at a position for closing the head insertion hole provided in the corner storage space of the housing, and the torsion coil spring is a coil portion around which an elastic wire is wound,
This arm comprises two arms extending from the coil portion to the left and right, and when the torsion coil spring is housed in the corner space, the one arm extends from the coil portion substantially along the circular periphery of the disc. Part and a second part bent from the first extension part to the front end wall side in the insertion direction of the cartridge into the recording / reproducing apparatus.
An extension portion, a tip end of the second extension portion engages with the shutter, and the other arm extends from the coil portion toward the front end wall, and a third extension portion. A disk cartridge comprising a fourth extending portion that extends by bending toward a side end wall of the cartridge housing, and a tip of the fourth extending portion is engaged with the cartridge side end wall.