JPS6371991A - Disk cartridge - Google Patents

Abstract

PURPOSE:To effectively execute the opening operation of a shutter and to attain a compact device by providing an engaging part engaging with a shutter opening member in one side end part of a front plate part so as to protrude forward from the front plate part. CONSTITUTION:A cover closing part 71 for closing at least head inserting holes 6A, 6B by a shutter 7 and the front plate part integrally connected to the cover closing part 71 and sliding along the front surface of a cartridge case 1 are provided and the engaging parts 36A, 36B engaging with the shutter opening member are provided in at least one side end part of the front plate part so as to protrude forward from the front plate part. Thereby, the opening operation of the shutter is effectively carried out and at the time of mounting a disk cartridge at a loading position, a space between the head inserting hole and a carriage mechanism is not long.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disk cartridge, and more particularly to a shutter mechanism for opening and closing a head insertion hole provided in a cartridge case.

[Conventional technology]

Disk-shaped recording media such as magnetic disks and optical disks are designed to be easily handled and protected from dust by being inserted into a recording/playback device while still being stored in a disk cartridge so that desired information can be recorded and played back. ing. For this purpose, a head insertion hole is provided in the cartridge case forming the main body of the disc cartridge so that the head can come into contact with a disc-shaped recording medium when the disc cartridge is installed in a recording/reproducing apparatus. However, when the head insertion hole is provided in this manner, when the disk cartridge is not in use, dust may enter the cartridge case through the head insertion hole and adhere to the recording surface of the disk-shaped recording medium, or During handling, a finger or the like touches the recording surface of the disk recording medium through the head insertion hole, causing dust or scratches on the recording surface, making it impossible to record and reproduce properly. For this purpose, the disk cartridge is usually provided with a shutter that closes the head insertion hole when not in use.

FIG. 9 is a plan view showing one conventional example of such a disk cartridge (for example, Japanese Utility Model Application Publication No. 57-38388), in which (a) shows the front side and (b) shows the back side. , 1 is a cartridge case, 2 is an upper case, 3 is a lower case, 4 is a disk-shaped recording medium, 5A, 5B are slendle holes, 6A, 6B are head insertion holes, 7 is a shutter, 7A
, 7B is a shutter surface, 8A and 8B are openings, and 25 is a coil spring.

In the figure, a cartridge case 1 includes an upper case 2 and a lower case 3 that are integrated, and a disk-shaped recording medium 4 that can be used on both sides is housed therein. These upper cases 2. Spindle holes 5 having the same diameter are coaxially provided approximately in the center of the lower case 3, and the upper case 2.
A head insertion hole 6A of the same shape is provided on the forward side (upper side in the figure) of the spindle hole 5 of the lower case 3 so as to cross the entire recording area in the radial direction of the disk-shaped recording medium 4 and to overlap with each other. , 6B are provided.

A U-shaped shutter 7 is further attached to the cartridge case 1 so as to sandwich the cartridge case. An opening 8A is provided in the shutter surface 7A on the upper case 2 side of the shutter 7 (FIG. 9(a)), which is offset to the right side in the drawing from the center, and in the shutter surface 7B of the three examples of the lower case of the shirt tough. (FIG. 9(b)), an opening 8B is provided to the left of the center in the drawing.

These openings 8A and 8B are positioned so as to overlap each other on the shutter 7, and have almost the same shape as the head insertion holes 6A and 6B, and are formed slightly thicker than the head insertion holes 6A and 6B. .

This shutter 7 is located at arrow A with respect to the cartridge case 1.
It is possible to slide in the direction of arrow B.

When the disk cartridge is not in use, the shutter 7 is positioned at one end of its slidable range, as shown in the figure, thereby closing the head insertion holes 6A, 6B. The coil spring 25 elastically biases the shutter 7 in the opening direction.

However, when such a disk cartridge is used, the shutter 7 is moved in the direction of arrow A and positioned at the other end of its slidable range.

As a result, the opening 8A of the shirt tough is set at a position that includes the head insertion hole 6A of the upper case 2, and the opening 8B is set at a position that includes the head insertion hole 6B of the lower case 3, so that the head insertion holes 6A and 6B are set at a position that includes the head insertion hole 6B of the lower case 3. open.

Thereafter, the head is inserted into one of the recording surfaces of the disk-shaped recording medium 4 from either one of the head insertion openings 6A, 6B, and the pad is inserted into contact with the other recording surface from the other. Further, a spindle is inserted through the spindle hole 5A or 5B, and the disk-shaped recording medium 4 is attached to it. Furthermore, when taking out the disk cartridge 1 from the recording/reproducing apparatus, the head insertion holes 6A and 6B can be closed by moving the shutter 7 in the direction of arrow B using the restoring force of the coil spring 25.

[Problems to be Solved by the Invention] When opening the shutter 7, the front end of the shirt tough is hooked with a shutter opening member (not shown) provided in the recording/reproducing device, and the elasticity of the coil spring 25 is used as described above. The mechanism is such that the shutter 7 slides against the resistance. Incidentally, the conventional shutter 7 is often manufactured by bending a thin metal plate such as a stainless steel plate. Therefore, the portion of the front end of the shutter where the shutter opening member catches is small, and if the shutter and the shutter opening member are not properly secured, the shutter may come off from the shutter opening member while opening, blocking the head insertion hole. There is. If the disk cartridge is installed in the loading position in this state, the magnetic head may collide with the shutter and be damaged.
This causes various troubles such as recording and reproducing operations not being performed.

In order to eliminate these drawbacks, it is conceivable to make the front plate of the shutter that slides along the front of the cartridge case thicker so that the shutter opening member can reliably engage with the end face of the front plate. .

However, if you do this, the front plate of the shutter will protrude from the front of the cartridge case, which will lengthen the distance between the head insertion hole and the carriage mechanism when the disk cartridge is installed in the loading position. This creates extra space, leading to an increase in the size of the recording/reproducing device.

Furthermore, if a shutter in which only the front plate portion is made thicker is molded from synthetic resin, the following problem will occur. That is, if the shutter surface that closes the head insertion hole is thin, and only the front plate part is molded thickly, the hairs formed during molding will be noticeable on the front plate part, and the shutter surfaces will therefore tend to be wider than each other. If this happens, the shutter surface will be slightly lifted from the plane of the cartridge case, making it easy to create a gap, which will allow dust to enter through the gap, reducing the effectiveness of the shutter.

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems and provide a disk cartridge in which the shutter can be opened reliably and the distance between the head insertion hole and the carriage mechanism does not become long when the disk cartridge is installed in the loading position. It is about providing.

[Means for solving problems]

In order to achieve the above object, the present invention provides a cartridge case having a head insertion port, a disk-shaped recording medium rotatably housed in the cartridge case, a shutter for opening and closing the head insertion port of the cartridge case, In the disk cartridge, the shutter is provided with a spring member that elastically biases the shutter in the closing direction, and the shutter is integrally connected to at least a closing portion that closes the head insertion hole and the closing portion and extends along the front surface of the cartridge case. and a front plate portion that slides along the front plate portion, and an engaging portion that engages with the shutter opening member is provided at least on one end of the front plate portion so as to protrude forward from the front plate portion. This is a characteristic feature.

〔Example〕

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

First, the cartridge case will be explained with reference to FIGS. 1 and 2. Here, FIG. 1 is a plan view showing the upper case of the cartridge case, and FIG. 1(a) is a view from the outside, and FIG. 1(b) is a plan view from the inside (the side facing the disk-shaped recording medium). This is what I saw. FIG. 2 is a plan view showing the lower case of the cartridge case, with FIG. 2(a) being viewed from the outside and FIG. 2(b) being viewed from the inside. In addition, in FIGS. 1 and 2, 2 is an upper case, 3 is a lower case, 5A and 5B are spindle holes,
6A and 6B are head insertion holes, 9A and 9B are guide grooves, IIA and IIB are shutter sliding parts, and 12AI.

12Az, 12B+, 12B2 are edges, 13A+
, 13B+ is the front left corner, 13A z-13B z is the front right corner, 14A.

14B is a recess, 15A, 15B are side walls, 16A, 16
B is a wall, 17A, 17B are arcuate ribs, 18A, 18B are radiation lips, 19A, 19B are stoppers, 2OA, 20B
21 is a boss, 21 is a partition wall, and 22A and 22B are locking holes.

In FIG. 1, the upper case 2 is provided with a spindle hole 5A approximately in the center thereof, and a head insertion hole 6A is provided in front of the upper case 2 (above in the drawing) with respect to the spindle hole 5A.
is provided.

As shown in FIG. 1(a), the outer surface of the upper case 2 is
In front of the spindle hole 5A, there is provided a portion (shutter sliding portion 1) slightly smaller than other portions (shutter sliding portion 1).

This shutter sliding portion 1)A has a substantially rectangular shape and includes a head insertion hole 6A, and its widthwise side (horizontal direction in the drawing) reaches close to the widthwise side of the upper case 2. The front edge of the shutter sliding part 1)A consists of two edges 12A+ and 12A2 that border on the slightly right side of the head insertion hole 6A, and edge 1.2A+ protrudes slightly forward than edge 12A2. . In the shutter slide 9JJ portion 1)A, a guide groove 9A is also provided in the vicinity of the end side 128 on the left side of the head insertion hole 6A and parallel to this end side 12A1.

The front left and right corners 138+ and 13A2 of the upper case 2 protrude forward from the edge 12A+ of the shutter sliding portion 1)A, and the front right corner 13A of the shutter sliding portion 1)A side A recess 14A is provided on the side surface facing the step between the end sides 12Al and 12Az.

As shown in FIG. 1(b), the inner surface of the upper case 2 has a side portion that is similar to the side wall 1 except for a part of the end side 12Al.
5A is provided. From the plurality of parts of the side wall 15A, there are a plurality of walls 16A having the same height as the side wall 15A.
stands out. A pin-shaped stopper 19A is provided on the right side of the end side 12A and the nearby wall 16A. This stopper 19A is set higher than the side wall 15A.

Further, on the inside of the side wall 15A, a plurality of arcuate ribs 17A are provided concentrically with respect to the spindle hole 5A, and from the side wall 15A, a plurality of radial ribs 18A are provided radially with respect to the spindle hole 5A. It protrudes inward. These arcuate ribs 17A and radial ribs 18A are lower than the side wall 15. Further, a boss 20A is provided on the back side of the shutter sliding portion 1)A at the front right corner in the side wall 15A, and a locking hole 22A is provided at the lower right side of the boss 20A in the drawing. There is.

A disk-shaped recording medium (not shown) is placed within this side wall 15A with the spindle hole 5A at the center.

The lower case 3 of the cartridge case is also shown in Fig. 2(a).
As shown in (b), its outer and inner surfaces are almost the same as the upper case 2. Therefore, FIGS. 2(a) and (b)
), Fig. 1(a).

The parts corresponding to (b) are simply changed from A to B in FIGS. 1(a) and (b).

However, on the inner surface of the lower case 3, as shown in FIG. 2(b), at the tip of the wall 16B protruding from the side wall 15B,
A partition wall 21 is provided to isolate the four corners of the lower case 3. These partition walls 21 are higher than the side walls 15B and walls 16B.

These upper case 2) Bosses 2OA and 2CIB of lower case 3
A spring member, which will be described later, is attached to the upper case 2, a disk-shaped recording medium is provided on the inner surface of the lower case 3, and the upper case 2 is arranged so that its inner surface faces the inner surface of the lower case 3 and its outer periphery matches the outer periphery of the lower case 3. When stacked on the lower case 3, the partition wall 20 on the inner surface of the lower case 3 fits between the tip of the wall 16A of the upper case 2 and the side wall 15A or between the tips of the two walls 16A, and the upper case 2 and the lower case 3 A cartridge case is obtained by bonding these together by applying ultrasonic heating.

At this time, the side walls 15A, 15B of the upper cases 2, 3 are in close contact with each other, and the walls 16A, 16B are also in close contact with each other. Further, the partition wall 21 of the lower case 3 is in close contact with one top of the upper case 2. Therefore, the disk-shaped recording medium is sealed by these.

FIG. 3(a) shows the cartridge case l viewed from the upper case 2 side, and the shutter sliding portion 1) of the lower case 3 is located in front of the edge 12A2 of the shutter sliding portion 1)A.
The end side 12B1 side portion of B is visible.

Looking at this cartridge case from the front arrow X direction,
As shown in Figure 3(b), there is a gap 2 on the left upper case 2 side.
4A, and there is also a gap 24B on the right lower case 3 side.

This gap 24A is formed between the side wall 15B, wall 16B, partition wall 21 at the upper right corner of the lower case 3 (Fig. 2(b)), and the upper case 2 (
The approximately triangular part 23A (Fig. 3(a)) surrounded by the side wall 15A and wall 16A at the upper left corner of Fig. 1(b)) is partially opened, and a boss 20B and a stopper 19B are installed in this part and a locking hole 22B (FIG. 2(b)), through which a spring member for automatic shutter return, which will be described later, is attached. This triangular part 23A,
Hereinafter, this will be referred to as the spring member storage section. Similarly, gap 24B
are boss 20A, stopper 19A and locking hole 22A (
A substantially triangular spring member housing portion 23B provided with the portion shown in FIG. 1(b)) is open, and a spring member is attached thereto.

FIG. 4(a) is a plan view showing the spring member 25 stored in the spring member storage portions 23A and 23B, and FIG. , 28
．． 28' is a bent portion, and 29.29' is a contact portion.

In the figure, the spring member 25 is a left-handed torsion coil spring, and arms 27.2 extend from both ends of the coil portion 26.
A portion of 7' is bent to form a bent portion 28, 28', and the tips of these bent portions 28, 28' are rounded to form abutting portions 29, 29'.

As is clear from FIG. 4(a), ll7i! extends from the coil portion 26! The angle formed by 27.27' is 180
It is slightly narrower on the coil part 26 side than ', and the bent part 28
is bent from the arm 27 to the side opposite to the coil part 26 within a plane perpendicular to the central axis 30 of the coil part 26 and including the arm 27, and the angle with respect to the arm 27 is set larger than 90'. The bent portion 28' is also aligned with the central axis 30 of the coil portion 26.
It is bent to the side opposite to the coil portion 26 in a plane perpendicular to the arm 27' and including the arm 27', and the angle with respect to the arm 27' is the arm 27. The angle is set equal to the angle formed by the bent portion 28. moreover,
As is clear from FIG. 4(b), the contact portion 29 is
Arms 27 . The tip of the bent portion 28 is bent round on the opposite side of the coil portion 26 with respect to the plane including the bent portion 28. Similarly, the contact portion 29' is connected to the coil portion 29'.
In a plane parallel to the central axis 30 of 6 and including the bent portion 28',
The coil part 2 with respect to the plane including the arm 27' and the bent part 28'
The tip of the bent portion 28' is roundly bent on the opposite side from 6. Note that the arms 27 and 27' have the same length, the bent portions 28 and 28' have the same length, and the abutting portions 29 and 29' have the same size and shape. Also, from the distance between the two ends of the coil portion 26 shown in FIG. 4(b), the arm 27 (or 27
') is the width l obtained by subtracting the thickness of upper case 2. side wall 15A of lower case 3;
It is slightly longer than the height of 15B.

With the above configuration, the spring member 25 is orthogonal to the central axis 30 of the coil section 26 and divides the angle formed by the arms 21 and 21' into three equal parts, and the center of the coil section 26 in the length direction It is axially symmetrical with respect to an axis 31 passing through it, and if it is rotated 1806 times about this axis 31 from the state of FIG. 4(a) (i.e., repeated pulling), it will be in the same state as shown in FIG. 4(a).

Figure 5 shows the lower case 3 of the spring member storage section 23A (Figure 3).
The state in which the spring member 25 is attached to the side is shown, and the same figure (
Figure a) is a plan view, and figure (b) is a cross-sectional view taken from the dashed-dotted line in the direction of the arrow, and parts corresponding to those in the previous drawings are given the same reference numerals.

In the figure, the coil portion 26 of the spring member 25 is connected to the boss 20.
It is inserted into B. The lower arm 27' of this spring member 25
is positioned in the direction of the locking hole 22B, and the abutting portion 29' at the tip thereof fits into the locking hole 22B.

The upper arm 27 of the spring member 25 is positioned toward the side wall 15B and is in contact with the stopper i9B. The bent portion 28, including the abutting portion 29, is positioned on the side wall 15B.

In this state, the spring member 25 is twisted, and due to the restoring force, the contact portion 29' bent downward into a circle is pressed against the side surface of the locking hole 22B, and the arm 27
is also pressed against the stopper 19B.

Also in the other spring member storage section 23B (Fig. 3),
The same spring member 25 is similarly attached to the upper case 2 (FIG. 1(b)) side. As previously explained in FIG. 4, the spring member 25 has the same shape even if it is repeatedly pulled, so the same spring member 25 is placed in the spring member storage portions 23Δ, 23B.
can be attached.

I have explained the cartridge case above, but next,
The shutter will be explained.

FIG. 6 shows the shutter 7, in which (a) is a plan view, (b) is a front view, and (c) is a left side view.
The same figure (d) is a right view, and is 7A.

7B is the shutter surface, 71A and 71B are the closing parts, and 8A.

8 At, 8 B++ 88z is opening, 32A, 32B
3 is a claw, 33 is a connecting portion, 34 is a center line 35A, 35B is an abutment plate, and 36A.

36B is an opening member engaging portion, and 37A and 37B are reinforcing members.

In the figure, the shutter surfaces 7A and 7B are parallel to each other and are connected by a connecting part 33, forming a U-shape.As is clear from the figure, the connecting part 33 is designed to be thin like the shutter surfaces 7A and 7B. ing.

Are these shutter surfaces? The distance between A and 7B is the shutter sliding part 1) A and I in the cartridge case 1 (Fig. 3).
Although it is slightly larger than the thickness between IB, it is set almost equal to this. The shutter surface 7A has a closing portion 7 symmetrically with respect to the center line 34 shown by a dashed line (FIG. 6(a)).
Two rectangular openings 8/'z, 8At on both sides of 1A
is provided. These openings 8 A + , 8 A
The length and width of t are larger than each of the head insertion holes 6A (Fig. 1) and 6B (Fig. 2) of the cartridge case;
Also, opening 8A+, 8A! The distance between the head insertion hole 6A
, 6B. Shutter surface 7B
A similar closing lid part 71B and two openings 8B+ and 88z are provided, and the opening 8B is the same as the opening 8 of the shutter surface 7A.
A.

In addition, the opening 8B2 is also connected to the opening 8Az, and the closing lid part 7 is also connected to the opening 8Az.
1B respectively face the closing lid portion 71A.

Furthermore, as is clear from Fig. 6(a) and (t)),
A claw 32A is provided at the upper left corner of the inner surface of the shutter surface 7A,
Similarly, a claw 32B is provided at the upper right corner of the inner surface of the shutter surface 7B.

Opening member engaging portions 36A and 36B are provided at both ends of the connecting portion 33 so as to protrude from the front surface of the connecting portion 33. In addition, the engagement surfaces of the opening member engagement portions 36A and 36B (
On the side opposite to the outer surface), there are closing lid parts 71A and 71B.
Reinforcing members 37A and 37B are provided which are connected to the reinforcing member 37A, and the opening member engaging portions 36A and 368B are respectively connected to the reinforcing member 37A.

37B mechanically reinforced. These connecting portions 33 and the opening member engaging portions 36A and 36B on both sides make the planar shape of the front portion of the shirt tough approximately concave.

Furthermore, as is clear from FIG. 6 (C1, (d)), on the right side of the shutter 7, at the joint part between the connecting part 33 and the shutter surface 7A, there is a structure that slightly closes the space between the shutter surfaces 7 and 7B. An abutting plate 35A is provided, and a similar abutting plate 35B is also provided on the left side surface of the shirt tough at the joint portion between the connecting portion 33 and the shutter surface 7B.Abutting plate 35A.
The length in the vertical direction in the drawing is slightly shorter than the step of the end sides 12A+ and 12Az of the shutter sliding part 1)A of the upper case 2 (Fig. 1) in the cartridge case 1, and similarly, the length of the abutment plate 35B in the vertical direction in the drawing is also the end side 12B+ of the shutter sliding part 1)B of the lower case 3 (Fig. 2).
, 128z. Further, the length of the contact plate 35A in the lateral direction in the drawing is slightly shorter than the sum of the thickness of the shutter sliding portion 1)A of the upper case 2 and the height of the side wall 15A (Fig. 1(b)). Similarly, the length of the contact plate 35B in the lateral direction in the drawing is slightly smaller than the sum of the thickness of the shutter sliding portion 1)B of the lower case 3 and the height of the side wall 15B (Fig. 2(b)). short.

In such a shutter 7, the inner surface of the shutter surface 7A faces the shutter sliding portion 1)A of the cartridge case 1 shown in FIG. 3, and the inner surface of the shutter surface 7B faces the shutter sliding portion 1).
The cartridge case 1 can be sandwiched and attached so as to face B. In this case, the inner surface of the connecting portion 33 of the shirt tough contacts the shutter sliding portion 1)A end side 12A of the upper case 2 and the shutter sliding portion 1)B end portion 12B+ of the lower case 3. Moreover, a claw 32A provided on the inner surface of the shutter surface 7A
is the upper case 2 of the cartridge case 1 (Fig. 1(a)
) is fitted into the guide groove 9A provided in the shutter surface 7B.
The claw 32B provided on the inner surface of the guide 7m 9 B is also provided on the lower case 3 (FIG. 2(a)). In this way, the shutter 7 is connected to the shutter sliding portion 1) A of the cartridge case 1 in FIG. 3 f8).
IIB, and this shutter 7 is slidable along guide grooves 9A and 9B.

FIG. 7 shows a state in which the shutter 7 is attached to the cartridge case 1, viewed from the upper case 2 side, and parts corresponding to those in the previous drawings are given the same reference numerals.

In the same figure, the torsion coil springs 25 of FIG. 4 stored in the spring member storage portions 23A and 23B are designated by reference numeral 25A, respectively.

It is represented by 25B. When the shutter 7 is attached to the cartridge case 1, the boss 20B provided in the lower case 3 is inserted into the spring member storage portion 23A of the cartridge case L.
One arm 27 of the torsion coil spring 25A attached to the
The contact portion 29A at the tip of A is connected to the tearing coil spring 25A.
is in contact with the right side surface of the shirt tough due to the action of being untwisted, and the spring member storage portion 23
Contact portion 29 of the coil spring 25B attached to B
B is also in contact with the left side surface of the shutter 7 due to the same effect. When the elastic forces of these torsion coil springs 25A, 25B are equal, these contact portions 29A, 29B contact the right side and left side of the shutter 7, respectively, and the arms 27A, 27B contact the stopper 19B, respectively. 1
9A, and in the shutter 7, the biasing force to the left by the torsion coil spring 25A and the biasing force to the right by the torsion coil spring 25B are balanced, and the shutter 7 is slightly separated from the shutter sliding part 1)A. Stand still in the center.

At this time, the closing lid part 71A between the openings 8A1 and 8A2 on the shutter surface 7A is inserted into the head insertion hole 6 of the shutter sliding part 1)A.
It will block A. The same goes for the shutter surface 7B (FIG. 6) on the opposite side to the shutter surface 7A, and the head insertion hole 6B (FIG. 2) of the lower case 3 is closed.

In addition, one of the torsion coil springs 25A and 25B, for example (if the return coil spring 25A has a larger elastic force than the torsion coil spring 25B), the biasing force of the torsion coil spring 25A resists the biasing force of the torsion coil spring 25B, and the shutter is closed. 7 moves to the left, but twists the coil hap, 25
127A of A immediately contacts the stopper 19B, the biasing force of the torsion coil spring 25A is lost, and the tear recoil spring 2
5B tries to move the shutter 7 to the right. , 2, under the action of stoppers 19A and 19B,
The shutter 7 stands still in a state where the biasing forces of the torsion coil springs 25A and 25B are balanced.

The interval between the openings 8A, , 8A2 on the shutter surface 7A of the shutter 7 and the opening 8B on the shutter surface 7B! , SBz is made slightly wider than the width of the head insertion holes 6A, 6B, respectively, so even when the biasing forces of the torsion coil springs 25A, 25B are balanced as described above, these head insertion holes 6
A and 6B are in a blocked state.

When a disk cartridge having such a configuration is installed in a recording/reproducing apparatus, if a shutter opening member (not shown) is provided on the front left side of the shutter 7, this shutter opening member opens the opening member engaging portion. 36B is pressed. Therefore, the shutter 7 is guided to the right by the claws 32A, 32B (FIG. 6) along the guide grooves 9A, 9B (FIG. 2) and against the biasing force of the tear recoil spring 25A. However, the arm 27B of the torsion coil spring 25B is
When the shutter 7 moves to the right, the stopper 19A immediately
The tearful state will no longer be released.

As the shirt tough moves to the right, the tearing coil spring 2
The contact portion 29A of the shutter 5A protrudes from the gap 23A (Fig. 3(b)) and is pushed by the shirt tough and moves in an arcuate trajectory, and when the shutter 7 reaches the right end of the shutter sliding portion 1)A and stops. , the bent portion 28A of the torsion coil spring 25A is inserted into the recess 14A. At this time, the shutter surface 7
The head insertion hole 6A is opened by the opening 8At of A (The state of the spring member storage portion 23A at this time is shown in FIG. 8. Also, the head insertion hole 6B of the three lower cases (FIG. 2)
Needless to say, the opening 8B2 (FIG. 6) of the shutter surface 7B opens the shutter surface 7B.

This makes it possible to insert a head through the head insertion hole 6A and a pad through the head insertion hole 6B, allowing recording or reproduction on one recording surface of the disk-shaped recording medium 4.

When recording or reproducing on the other recording surface of the disk-shaped recording medium 4, the disk-shaped recording medium 4 is turned over from the state shown in FIG. In this case, they are exactly the same, just by replacing A with B in each reference numeral in FIG. At this time, the opening member engaging portion 31A of the shirt tough is similarly pushed by the same shutter opening member, and the head insertion hole 6A opens at the opening 8Al, and the head insertion hole 6B opens at the opening 8B+.

In addition, the contact portion 29A of the round coil spring 25A, including the movement of the shirt tough, is the same as the contact portion 35A shown in FIG. 6(d).
, is in contact with the right end surface of the connecting portion 33 and the right side surface of the opening member engaging portion 36A, and similarly, the contact portion 29B of the torsion coil spring 25B, including the movement of the shirt tough, is in contact with the right end surface of the opening member engaging portion 36A.
The contact plate 35B shown in c) is in contact with the left end of the connecting portion 33 and the left side surface of the opening member engaging portion 36B. As described above, in this embodiment, the shutter is normally positioned at a resting position in the center of the slidable range of the cartridge case, and is attached to the cartridge case so as to be movable in two directions from this resting position. ing. Moreover,
Two openings are provided in each shutter surface of the shutter in the direction of movement thereof. When the shutter is in the rest position, the head insertion holes provided in the upper and lower cases of the cartridge case can be simultaneously closed between the two openings on each shutter surface, and the shutter is in the rest position. No matter which direction the head is moved from the position, the head insertion holes in the supranuclear and lower cases can be opened at the same time.

Therefore, from the above, when recording or playing back on either recording surface of a double-sided disc-shaped recording medium, whether the upper case of the cartridge case is placed upward or downward, the recording/playback device Simply move the shutter in the same direction with respect to the top of the cartridge case,
The head insertion holes provided in the lower case can be opened at the same time, and therefore, the recording/reproducing device has a shutter opening member that moves the shutters in the same direction to open the head insertion holes. Only one thing is enough,
Moreover, the shutter is moved by pushing the opening member engaging portion provided at the end of the shutter, and the width of the shutter in the moving direction is sufficiently wide because two openings are provided on each shutter surface. , it can be placed in a position where it does not interfere with other members such as a carriage, and the design conditions of the recording/reproducing apparatus can be relaxed.

Further, a claw 32A provided on each shutter surface of the shutter,
32B (Figure 6) is on the cartridge case.

Guide grooves 9A and 9B provided in the lower case (Fig. 1,
2), the shutter moves along the guide grooves 9A, 9B, but the claws 32A, 3
Even if there is play between 2B and the acid guide grooves 9A and 9B, the width of the shutter in the moving direction is sufficiently wide, and the claws 32A and 32B are provided optically separated at both ends of the shutter in the moving direction. This means that there is almost no shutter rattling.

Note that although the shutter 7 has the opening 8 in the above embodiment, the opening 8 is not necessarily necessary, and it is sufficient that the shutter 7 has at least a closing lid part 71 that closes the head insertion hole 6 of the cartridge case 1.

〔Effect of the invention〕

As described above, the shutter has at least a closing lid part that closes the head insertion hole and a front plate part that is integrally connected to the closing lid part and slides along the front surface of the cartridge case. The present invention is characterized in that an engaging portion that engages with the shutter opening member is provided on at least one end of the front plate portion so as to protrude forward from the flat plate portion.

With this configuration, the shutter opening member will be reliably caught on the shutter, and will not come off from the shutter opening member while opening the shutter and accidentally block the head insertion hole, unlike in the conventional case. , the shutter opening operation is performed reliably.

In addition, since the engagement with the shutter opening member is ensured by protruding the engagement portion as described above,
The front plate portion of the shutter can be made as thin as possible.

Therefore, when the disk cartridge is set in the loading position, the distance between the head insertion hole and the carriage mechanism is narrowed as much as possible, which ultimately reduces the extra space inside the recording/playback device and makes the device more compact. can be achieved.

Furthermore, when the shutter is molded from synthetic resin, the front plate can be made as thin as possible as described above, so there are almost no whiskers on the front plate during molding.

As a result, the closing portion of the shutter comes into close contact with the flat surface of the cartridge case, and the intrusion of dust can be reliably prevented.

[Brief explanation of the drawing]

1 to 8 show an embodiment of a disk cartridge according to the present invention, FIG. 3(a) and 3(b) are a plan view and a front view of the cartridge case, FIG. 4(al) is a plan view and a side view of the spring member, and FIG. A plan view and a cross-sectional view showing how the spring member is attached to the lower case, Fig. 6(a), fbl, (C1, (dl is a plan view, front view, left side view, and right side view of the shutter, The figure is a plan view showing how the shutter is attached to the cartridge, FIG. 8 is a plan view showing the state of the spring member when the head insertion hole is opened, and FIGS. 1. Cartridge case, 2. Upper case, 3.
...Lower case, 4...Disc-shaped recording medium, 5A, 5
B... Spindle hole, 6A, 6B... Head insertion hole, 7... Shutter, 9Δ, 9B... Guide groove, 12
A, 12B... Edge, 14... Hollow, 2OA,
20B...Boss, 25.25A. 25B...Spring member (coil spring), 29A, 29
B... Contact portion, 33... Connecting portion, 36... Opening member engaging portion, 37... Reinforcing member, 71... Closing lid portion. Figure 1 (Q) Figure 1 (b) Figure 2 (Q) Figure 2 (b) Figure 3 Figure 4 (CI) (b) Figure 5 (a) (b) Figure 8 Figure 9 figure

Claims (4)

[Claims] (1) A cartridge case having a head insertion port, a disk-shaped recording medium rotatably housed in the cartridge case, a shutter for opening and closing the head insertion port of the cartridge case, and a shutter with elasticity in the closing direction. In the disk cartridge, the shutter includes at least a closing lid portion that closes the head insertion hole, and a front plate portion that is integrally connected to the closing lid portion and slides along the front surface of the cartridge case. What is claimed is: 1. A disk cartridge comprising: a front plate portion, at least one end of which is provided with an engaging portion that engages with a shutter opening member so as to protrude forward from the front plate portion. (2) In claim (1), engaging portions are provided at both end portions of the front plate portion, and the front plate portion and the engaging portions on both sides cause the front portion of the shutter to A disk cartridge characterized by a substantially concave planar shape. (3) A disk cartridge according to claim (1), characterized in that a reinforcing portion connected to the front plate portion is formed on the opposite side of the engaging surface of the engaging portion. (4) The disk cartridge according to claim (1), wherein the shutter is molded from synthetic resin.