JPS61255571A - Disc cartridge - Google Patents

Abstract

PURPOSE:To make easy build-in of a case and a shutter and improve an operability by forming a guide groove of a cartridge case and a protruding section engaging therewith by an elastically deformable synthetic resin. CONSTITUTION:A shutter 3 slidably supported on a cartridge case 1 and opening and shutting a head access port is formed by a synthetic resin in a U shape. A protruding piece 11 engaging with a guide groove of the case 1 is formed by an elastically deformable synthetic resin and it inclined angle theta is 100-110 deg.. In this constitution, by pressing the case 1 into the shutter 3 with advancing the inclined surface 22 side of the case, the protruding piece is rid on the inclined surface 22, elastically deformed and fitted into the guide groove 7 by itself. Therefore, on inserting, an unreasonable stress is not concentrated, so that the build-in is made easy and an operability can be improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a disk cartridge such as a magnetic disk cartridge, an optical disk cartridge, an optical-magnetic disk cartridge, etc., and particularly to a disk cartridge including a shutter for opening and closing a head access port. This relates to disk cartridges.

[Conventional technology]

FIG. 19 is an exploded perspective view of a conventional magnetic disk cartridge, and FIG. 20 is a partially enlarged sectional view of the magnetic disk cartridge.

The magnetic disk cartridge includes a cartridge case 51 molded from hard synthetic resin, a magnetic disk 52 rotatably housed in the cartridge case 51, and the cartridge case 5.
1 and a shutter 53 slidably supported by the shutter 1.

A circular opening 54 is provided approximately in the center of the cartridge case 51.
is formed, and a head insertion port 55 is provided near it. Since the shutter 53 slides over the head insertion port 55, the upper surface near the head insertion port 55 is slightly lowered to form a recess 56, and near the front surface of this recess 56 there is a groove in the sliding direction of the shutter 53. A guide groove 57 is provided that extends along.

The shutter 53 is made of a metal plate such as a stainless steel plate, has a U-shaped side surface, and has an opening 58 that is approximately the same size as the head insertion port 55, and a blocker that closes the head insertion port 55 next to the opening 58. A portion 61 is formed, and two protruding pieces 59 are provided to protrude downward by cutting and raising.

This protruding piece 59 is fitted into the guide groove 57 of the cartridge case 51 as shown in FIG.
Since the shutter 53 is made of a gold r% plate and the protruding dimension of the protruding piece 59 is short, the protruding piece 59 cannot be elastically deformed when the shutter 53 is assembled into the cartridge case 51.

Therefore, the guide groove 57 in the cartridge case 51
Two thin-walled portions 60 are formed in front of the projections 59 in correspondence with the projections 59, and when the shutter 53 is assembled into the cartridge case 51, the projections 59 elastically deform the thin-walled portions 60 and ride over the thin-walled portions 60 to form the guide groove. 57 was used.

[Problem that the invention seeks to solve]

In order to protect the stored magnetic disk 52 from being bent by external force, the cartridge case 51 is made of hard synthetic resin.

Therefore, even if the thin wall portion 60 is formed as described above, since the material is not rich in elasticity, the amount of deflection due to the elasticity of the thin wall portion 60 cannot be increased very much. If it is made longer, it becomes difficult to assemble the shutter 53 into the cartridge case 51. On the other hand, if the protruding dimension of the protruding piece 59 is made shorter, it becomes easier to assemble it into the cartridge case 51, but the shutter 53 becomes easier to come off from the cartridge case 51. There is a problem with
It is necessary to strictly control the dimensions of the projecting piece 59.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention includes a hard cartridge case rotatably housing a disk, and a shutter for opening and closing at least a head access port such as a magnetic head insertion port of the cartridge case. A guide groove for guiding the sliding movement of the shutter is formed on the top surface of the cartridge case, and a protrusion, such as a protrusion, for engaging with the guide groove is provided on the shutter. The present invention is characterized in that at least the protrusion is molded from an elastically deformable synthetic resin such as polyacetal resin or polyamide resin.

〔Example〕

Next, each embodiment of the present invention will be described with reference to the drawings.

1 to 11 are for explaining a magnetic disk cartridge according to a first embodiment of the present invention, FIG. 1 is an exploded perspective view of the disk cartridge, and FIG. 2 is a partial plan view of the cartridge case. Figure 3 is an enlarged sectional view on line 2-2 in Figure 2, Figure 4 is an enlarged sectional view on line 2-2 in Figure 7, Figure 5 is a plan view of the shutter, and Figure 6 is on line 7 in Figure 7. 7 is a partial plan view showing the state of the disk cartridge when not in use, FIG. 8 is an enlarged sectional view along the harbor line of FIG. The partially enlarged sectional view shown in Fig. 10 is the 7th
FIG. 11 is an enlarged sectional view taken along the line in FIG.

The magnetic disk cartridge mainly includes a cartridge case 1, a magnetic disk 2 rotatably housed within the cartridge case, and a shutter 3 slidably supported by the cartridge case.

The cartridge case 1 is composed of a first half case 1a and a second half case 1b, which are made of ABS, for example.
It is molded from hard synthetic resin such as resin.

An opening 4 for inserting a rotational drive shaft is formed approximately in the center of the cartridge case 1, and a rectangular head insertion opening 5 is provided near the opening 4. The shutter 3 is located near the front of the first half case 1a and the second half case 1b.
Slightly lowered recesses 6 are formed in order to restrict the sliding range of the recesses 6 (see FIG. 8), and the head insertion opening 5 is opened at an intermediate position of the recesses 6. A guide groove 7 extending along the sliding direction of the shutter 3 is formed near the front surface of the first half case la (see FIGS. 2 and 8 to 10).

As shown in FIGS. 8 and 9, a thin part 21 that is elastically deformed is formed at the front end of the first half case la forming the guide groove 7, and a shutter is mounted on this half case as described later. When the shutter 3 is assembled, it is elastically deformed to facilitate the assembly of the shutter 3.

As shown in FIG. 1, a metal hub 8 is connected to the center of the magnetic disk 2, and is disposed within the opening 4 of the upper half case 1a.

The shutter 3 is made of a synthetic resin that is slightly softer than the cartridge case 1 and can be elastically deformed, such as polyacetal resin or polyamide resin. The shutter 3 includes a first face plate part 3a and a second face plate part 3a disposed to face the first face plate part 3a.
It is composed of a face plate portion 3b and a connecting plate portion 3C that connects the front side ends of the double-sided plate portions 3a and 3b, and has a U-shaped side surface. A rectangular opening 9 having approximately the same size as the head insertion port 5 and a closing portion 10 that closes the head insertion port 5 are arranged in the first face plate portion 3a and the second face plate portion 3b so as to face each other. They are installed in parallel.

Near the front surface (connecting plate portion 3C) of the first face plate portion 3a,
Two projecting pieces 11 are provided to protrude toward the second face plate portion 3b at a predetermined interval along the sliding direction of the shutter 3. As shown in FIGS. 8 to 10, this projecting piece 11 is
Rather than extending perpendicularly to the first face plate part 33, the tip (lower end) side thereof faces toward the connecting plate part 3C, in other words, downstream in the insertion direction X of the cartridge case 1 (see FIG. 9). It is slanted to the side.

In this case, the inclination angle θ of the protruding piece 11 shown in FIG. 8 is 95
In the range of ~120 degrees, preferably 100 to 110 degrees, the larger the inclination angle θ, the easier the work of assembling the shutter 3 into the half case 1a.

However, if the inclination angle θ becomes too large, the engagement with the guide groove 7 tends to become unstable, so it is recommended that the inclination angle θ falls within the above range.

The thickness d of the protruding piece 11 is 0.3751, which is the wall thickness of the shutter 3.
However, if the thickness is made thinner than the wall thickness of the shutter 3, it is easier to elastically deform, which is preferable.

Further, the longer the length i of the protruding piece 11, the easier the elastic deformation.

There is a protrusion 1 between this protrusion 11 and the edge of the connecting plate portion 3C.
A rectangular through hole 12 having approximately the same width as the width of the hole 1 is bored.

Further, a spring hook protrusion 13 is formed on the inner surface of the coupling portion 3C at a position approximately midway in the height direction of the coupling portion 3C, and as shown in FIG. A helical spring 14 is interposed between the shutter 3 and the shutter 3, and the spring elasticity of the helical spring 14 elastically biases the shutter 3 in the direction of closing the head insertion opening 5.

FIG. 11 is a partially enlarged sectional view showing the structure of the shutter molding die as described above. As shown in the figure, a fixed mold core 17 and a first face plate portion 3 forming the inner surface of the shutter 3
It is mainly composed of side cores 15 and 16 of movable molds that form the outer surfaces of the second face plate portion 3C and the upper mold 38 of the movable mold that forms the outer surface of the connecting plate portion 3C. With these molds, the first face plate portion 3a, the protruding piece 11. Second
Spaces 20 and 19° 39 are respectively formed to form the face plate portion 3b and the connecting plate portion 3C. These spaces 19°2
After injecting the molten resin under a reduced pressure of 0.39 mm and cooling it, the upper mold 18 is moved in the X direction and the side cores 15 and 16 are moved in the Y direction, so that the molded shutter 3 can be taken out from the mold. Note that 40 is a dividing plane. shutter 3
When taken out from the mold, the free ends of the first face plate part 3a and the second face plate part 3b (anti-connection plate part 3c) are removed as shown in FIG.
The sides are in elastic contact with each other.

Therefore, when assembling the shutter 3 into the cartridge case, as shown in FIG. Insert cartridge case 1. As shown in FIGS. 8 and 9, thin-walled portions 21 are formed in front of the guide groove 7 of the first half 1a at locations corresponding to the projecting pieces 11 of the shutter 3, and the corners of the thin-walled portions 21 are provided with inclined surfaces. 22 are provided. As shown in FIG. 9, when the cartridge case 1 is pushed into the shutter 3 with the inclined surface 22 side first, the protruding piece 11 of the shutter 3 rides on the inclined surface 22, and the protruding piece 11 deforms elastically by itself. Thin wall portion 21
While being slightly elastically deformed, the projecting piece 11 climbs over the thin wall portion 2 and fits into the guide groove 7. As in this embodiment, if the protruding piece 11 is inclined so as to face downstream in the insertion direction It is easily inserted into the guide groove 7.

As shown in FIGS. 8 and 10, when the shutter 3 attempts to come out of the cartridge case 1 after the protruding piece 1 has been fitted into the guide groove 7, the tip of the protruding piece 11 will fit into the guide groove 7. However, if the protruding piece 11 is inclined toward the connecting plate part 3C as in this embodiment, it acts as a support and receives the force that causes the shutter 3 to come off. Since the shutter 3 is stopped, it is possible to effectively prevent the shutter 3 from falling off.

When the entire shutter is made of plastic as in this example, it is possible to reduce the weight compared to conventional metal shutters, which not only reduces the weight of the disk cartridge itself, but also prevents accidental dropping of the disk cartridge on the floor. If a metal shutter is subjected to a severe impact such as being dropped, its own weight may cause it to fall away from the cartridge case, but a plastic shutter has a light weight and can be prevented from falling off from the cartridge case.

12 to 14 are for explaining the second embodiment of the present invention, and FIG. 12 is an exploded perspective view of the shutter 3;
Figure 13 is a perspective view of the assembled state, Figure 14 is the first
3 is a sectional view taken along line 2-2 in FIG. 3; In the case of this embodiment, the first face plate part 3a, the second face plate part 3b, and the connecting plate part 3c are made of thin metal plates such as stainless steel plates, and the first face plate part 3a and the second face plate part 3b have openings. 9 and occlusion part 1
0 are arranged in parallel.

Two rectangular protrusion member attachment openings 23 are opened near the first face plate portion 3a and the connecting plate portion 3c at a predetermined interval along the sliding direction of the shutter 3. This opening 2
The projecting piece members 24 that are fitted into the respective parts 3 are made of a slightly elastic synthetic resin such as polyacetal resin or polyamide resin, and have fitting grooves 25 formed in the left and right directions, and projecting pieces 26 integrally hanging on the lower surface. It is set up. By fitting the edge of the opening 23 into the fitting groove 25, the projecting piece member 24 is firmly fixed to the first face plate portion 3a as shown in FIG. Although not shown, when the shutter 3 is pushed and inserted into the cartridge case 1, the protruding piece 26 fits into the guide groove 7 (see Fig. 1) formed on the front side of the cartridge case 1 by its own elastic deformation. be done.

A spring hook protrusion 27 is integrally provided on the connecting plate portion 3C of the shutter 3 by cutting and raising, and this has one end of the helical spring 14 in the same way as shown in FIG. 7 of the first embodiment. is multiplied.

15 and 16 are for explaining a third embodiment of the present invention, in which FIG. 15 is a perspective view of the first face plate used in the shutter, and FIG. 16 is a sectional view of the shutter.

In the case of this embodiment, the first face plate part 3a and the second face plate part 3b are individually made of thin metal plates such as stainless steel plates, and as shown in FIG. A plurality of punched holes were formed.

As shown in FIG. 16, the first face plate part 3a and the second face plate part 3
b are connected by a connecting portion 29 formed by insert molding. A part of the synthetic resin constituting this connecting portion 29 penetrates the punched holes 28 of the first face plate portion 3a and the second face plate portion 3b, enters the inside, and connects with the first face plate portion 3a and the second face plate portion 3b. The connection with part 29 is strengthened.

A projecting piece 30 is integrally provided vertically on the inner surface of the portion of the connecting part 29 that is connected to the first face plate part 3a, and although not shown, this projecting piece 30 is formed on the front side of the cartridge case 1. It is fitted into the guide groove 7 (see FIG. 1) by its own elastic deformation.

17 and 18 are for explaining the fourth embodiment of the present invention, and FIG. 17 is a perspective view of the shutter 3;
FIG. 8 is a sectional view of a mold used to mold the shutter 3.

This shutter 3 is different from the shutter 3 shown in FIG. 1 described above in that a hole 31 is formed at a position facing the through hole 12 of the second face plate portion 3b. This hole 31 is necessary to reduce the moldability of the shutter 3, especially the variation in thickness between the first face plate part 3a and the second face plate part 3b, and this will be explained with reference to FIG. 18.

The mold for forming the shutter 3 includes a side core 32, a side core 33, a fixed core 34 fixed between the two, and an upper mold 35.

A space 37 forming the second face plate part 3b by the side core 32 and the fixed core 34, a space 38 forming the first face plate part 3a by the side core 33 and the fixed core 34, and a space 38 forming the first face plate part 3a by the side core 33 and the fixed core 34, In the space 39 forming the connecting plate part 3c, the through hole part 12 is formed by a part of the side core 33, and the waste hole 31 is formed by a part of the side core 32.

When injection molding the shutter 3 with the gate position indicated by arrow G in FIG.
2 is provided and the protruding piece 11 is formed on that side, the flow resistance of the molten resin is different between the space 37 and the space 38, and the flow resistance of the space 38 is different from that of the space 3.
It is larger than 7. In this way, space 37 and space 38
The flow resistance of the molten resin is different depending on the fixed core 34.
If the end portion 34a side of the fixed core 34 is not clamped, the molten resin will easily flow to the space 37 side where the flow resistance is small, and the fixed core 34 will tilt toward the side core 33 side due to the injection pressure of the molten resin. The second face plate portion 3b is thicker than the first face plate portion 3a, and in severe cases, molding defects may occur.

Therefore, in this embodiment, in order to prevent the fixed core 34 from tilting, the end portion 34a of the fixed core 34 is attached to two sliding side cores 3.
2.33, so that the width of the space 37.38 is constant. In addition, by inserting the side core 32 that is approximately the same size as the side core 33, the flow resistance of the molten resin on the space 37 side can be made closer to that on the space 38 side, so that the filling speed of the resin in the rain spaces 37 and 38 is almost equal. Become. For this reason, the first face plate part 3a and the second face plate part 3b have the same wall thickness, and the fixed core 3
It is also possible to eliminate molding defects caused by the inclination in step 4.

Note that the waste hole 31 is formed by inserting a part of the side core into the space 37 side.

In the embodiment, if the first face plate part 3a and the second face plate part 3b are formed of metal plates, the mechanical strength is strong, and the first face plate part 3a
, the second face plate portion 3b can be made thinner, and the printability of the surface is also good.

In the embodiment described above, the thin wall portion 21 and the inclined surface 22 are provided on the front side of the cartridge case 1, but this is not necessarily necessary.

In the above embodiment, a case has been described in which the shutter 3 opens and closes only the head insertion port 5, but it can also be configured to open and close both the head insertion port 5 and the opening 4 into which the hub 8 is inserted.

Further, in the above embodiments, an embodiment of a magnetic disk cartridge has been described, but the present invention is not limited thereto, and can be applied to other disk cartridges such as, for example, optical disks and optical-magnetic disks.

〔effect〕

Since the present invention has the above-described configuration, it is easy to assemble the cartridge case and the shutter, making the work easier. In addition, since the protrusions provided on the shutter are made of elastically deformable synthetic resin, wear on the guide grooves and protrusions due to the sliding movement of the shutter is prevented compared to metal shutters, and sliding resistance is further reduced. A smooth shutter operation can be obtained.

[Brief explanation of the drawing]

1 to 11 are for explaining a magnetic disk cartridge according to a first embodiment of the present invention, FIG. 1 is an exploded perspective view of the disk cartridge, and FIG. 2 is a part of a cartridge case. The plan view and Figure 3 are as shown in Figure 2-2.
Figure 4 is an enlarged sectional view on the second line, Figure 4 is an enlarged sectional view on the line in Figure 7, Figure 5 is a plan view of the shutter, Figure 6 is a sectional view on the line in Figure 7, and Figure 7 is an enlarged sectional view on the line in Figure 7. FIG. 8 is an enlarged sectional view taken along the line of FIG. FIG. 7 is an enlarged cross-sectional view along the harbor line, and FIG. 11 is a partially enlarged cross-sectional view showing the structure of the molding die for the shutter. 12 to 14 are for explaining the second embodiment of the present invention, in which FIG. 12 is an exploded perspective view of the shutter, FIG. 13 is a perspective view of the shutter in its assembled state, and FIG. 14 is a perspective view of the shutter. FIG. 7 is a sectional view on the harbor line. 15 and 16 are for explaining a third embodiment of the present invention, in which FIG. 15 is a perspective view of the first face plate used in the shutter, and FIG. 16 is a sectional view of the shutter. 17 and 18 are for explaining the fourth embodiment of the present invention, FIG. 17 is a perspective view of the shutter, and FIG. 18 is a perspective view of the shutter.
The figure is a sectional view showing the structure of a mold for the shutter. FIG. 19 is an exploded perspective view of a conventional magnetic disk cartridge, and FIG. 20 is a partially enlarged sectional view of the magnetic disk cartridge. 1... Cartridge case, 2... Magnetic disk, 3... Shutter, 5... Head insertion slot, 7
...Guide groove, 11...Protrusion piece, 12...Through hole portion, 24...Protrusion piece member, 26.30...Protrusion piece. (Agent Patent Attorney 2 Kenji Department 24 Figure 2 Figure 3/b Figure 4 Figure 1 O Figure 12 Figure 73 Q Figure 14 A Figure 75 Figure 3b Li Figure 1? Figure 78

Claims (4)

[Claims] (1) A cartridge case rotatably housing a disk, and a shutter for opening and closing at least a head access port of the cartridge case, and a guide groove for guiding the sliding of the shutter is formed in the cartridge case. , on the other hand, a disk cartridge in which the shutter is provided with a protrusion that engages with the guide groove, wherein at least the protrusion of the shutter is made of an elastically deformable synthetic resin. (2) In claim (1), the shutter includes a first face plate part, a second face plate part facing the first face plate part, and ends of the first face plate part and the second face plate part. The connecting plate has a U-shaped side surface, and a protrusion protruding from the inner surface of one of the first and second face plates is connected to the connecting plate. A disc cartridge characterized by being slanted toward the front side. (3) The disk cartridge according to claim (2), wherein the entire shutter is molded from synthetic resin. (4) In claim (1), the shutter is composed of a metal shutter body and a synthetic resin protrusion member, and the shutter body includes a first face plate portion and a first face plate portion thereof. It consists of a second face plate part facing the first face plate part, and a connecting plate part that connects the ends of the first face plate part and the second face plate part, and has a U-shaped side surface, and the protrusion member is attached at a predetermined position. 1. A disk cartridge characterized in that the protrusion member is provided with an elastically deformable protrusion, and the protrusion member is attached to a protrusion member attachment portion of a shutter body.