JP2634737B2 - Spring member for urging shutter of disk cassette and disk cassette - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutter biasing spring member used for a disk cassette for accommodating a magneto-optical disk or a magnetic disk as a recording medium and a disk cassette to which the shutter biasing spring member is applied. About.

[0002]

2. Description of the Related Art A disk cassette for accommodating a disk as a recording medium is provided with a shutter for slidably covering a head insertion window of a disk driver provided in a case for protecting the disk. Heretofore, there has been a device using a torsion spring as shown in JP-B-63-30709 to bias the shutter from the open position to the closed position. When the torsion spring is mounted on the disk cassette, the torsion spring is fitted into the case on which the slider is mounted, between the case and the slider.

[0003]

However, in such a torsion spring, the arm portion is also made of the same material and the same wire as the torsion spring. It would be curved. Therefore, when the disk cassette is transported in a temporarily fixed state in the assembling process, there is a problem that the spring arm is easily bent by an external impact or vibration, and the mounted spring comes off. For this reason, there have been problems in that the spring must be mounted in a later step, and care must be taken not to apply impact or vibration to the temporarily fixed disk cassette.

The present invention is intended to solve such a problem. Even if the disk cassette is temporarily fixed, the spring mounted between the slider and the case does not come off and the shutter bias of the disk cassette is released. It is an object to provide a spring member for use and a disk cassette.

[0005]

In order to achieve this object, the present invention employs the following configuration. That is, the invention according to claim 1 (hereinafter, referred to as a first invention) is formed of a rigid material in an elongated shape, and is pivotally mounted on one end of a pivotable shaft at a center. A disk cassette, comprising: an arm member; and a spring provided between the arm members, and a spring for urging the arm member in a direction in which the angle between the arm member and the swing shaft attachment portion becomes larger. The gist of the present invention is a shutter biasing spring member .

According to a fourth aspect of the invention (hereinafter referred to as a second invention), a disk, a case for accommodating the disk,
It is formed in a U-shape in cross section from one upper surface portion and two side surface portions continuously provided on both sides of the upper surface portion, and is slidably provided so as to sandwich the case by the two side surface portions. Disk cassette, comprising: a shutter that is fixed to the shutter; and a slider that is fixed to the shutter and slidably supported by the case to reciprocate the shutter between an open position and a closed position. In any one of claims 1 to 3 ,
By mounting the spring member for biasing the shutter of the disc cassette described in the section between the slider and the case,
The gist of the present invention is a disk cassette characterized in that the shutter slides while being urged from the open position to the closed position.

[0007]

According to the first aspect of the invention, in the case of the spring member for biasing the shutter of the disc cassette, two arm members formed of a rigid material and having an elongated shape are swingable about a swing shaft attaching portion at one end. Axle-mounted. Further, a spring is provided between the arm members to urge the arm members in a direction in which the angle of the arm members increases. Therefore, the arm member is formed of a rigid material, and does not bend even if it receives an external impact.

Therefore, in the disk cassette of the second invention provided with the shutter biasing spring member of the disk cassette, the arm member and the spring are easily detached from the disk by an external impact or vibration even in the state where the disk cassette is temporarily fixed. Nothing.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an overall view of a disk cassette 1 as one embodiment of the present invention. Disc cassette 1
Comprises a case 3, a slider 5, a shutter 7, a magneto-optical disk 9, a biasing spring member 11, and the like.

The case 3 is made of a synthetic resin, and is configured by combining and fixing an upper shell 13 shown in FIG. 2 and a lower shell 15 shown in FIG. FIG.
2A is a front view of the upper shell 13, FIG. 2B is a plan view thereof, FIG. 2C is an AA end view thereof, and FIG. 2D is a BB end view thereof (enlarged view). It is.

An opening 21, a first guide ridge 23a, and a second guide ridge 23 are formed in the upper shell 13 having a substantially square plate shape.
b, a first guide wall 25a, a second guide wall 25b, a shutter sliding surface 26, a circular base 27, a label sticking surface 28, a screw boss 29, a circular opening 30, and the like.
The opening 21 serves as a window for exposing the magneto-optical disk 9 to the outside when the disk cassette 1 is mounted on a disk driver and information on the magneto-optical disk 9 is read or written. The first support ridge 23a and the second guide ridge 23b contact the first support portion 55 and the third support portion 59 of the slider 5 shown in FIG. I'm sure.

First guide wall 25a, second guide wall 25b
The shutter fixing portion 53 and the second support portion 57 of the slider 5 shown in FIG. As a result, the slider body 51 described later is more reliably supported by the regulating wall 33 of the lower shell 15. The shutter sliding surface 26 is formed with a shallow concave surface so that the shutter 7 comes into contact therewith and slides. The circular pedestal 27 has the magneto-optical disk 9 mounted thereon, and the upper shell 13 and the lower shell 15
Is provided so that the magneto-optical disk 9 is not largely shaken when the disk cassette 1 is carried. The label attaching surface 28 has a shallow concave surface so that the label of the disc cassette 1 can be attached thereto. This concave surface is a mirror surface so that the adhesive label can be easily attached. The screw boss 29 is located on the upper shell 1
3 is provided at each of the four corners, and has a circular projection having a tip portion larger than the base portion, and a screw hole 29a is provided at the center thereof.

FIG. 3A is a front view of the lower shell 15, FIG. 3B is a plan view thereof, FIG. 3C is an AA end view (enlarged view) thereof, and FIG. BB end view (enlarged view)
It is. The lower shell 15 has a long opening 31 and a regulating wall 3.
3, a guide ridge 35, a guide groove 37, a slider guide rail 39, a disk storage wall 41, a boss receiving portion 43, an urging member fixing portion 45, a case side edge wall 47, a case recess 49, and the like.

The long opening 31 is used to mount the disk cassette 1 on a disk driver and to read or write information on the magneto-optical disk 9 when the magneto-optical disk 9 is read or written.
Window to expose the outside. The regulating wall 33 is a bar-shaped support member having a trapezoidal cross section, and is provided so as to bridge both upper ends of the long opening 31. This regulation wall 33
4 supports the slider main body 51 forming the main part of the slider 5 shown in FIG. The upper surface 61a of the fourth support portion 61 of the slider 5 shown in FIG.
One end 55a of the first support portion 55 of the slider 5 is engaged with the guide groove 37, so that sliding of the slider 5 is ensured. A hook-shaped fifth support portion 63 of the slider 5 is engaged with the upper end of the slider guide rail 39 to prevent the sliding direction of the slider 5 from shifting. The disk storage wall 41 is erected inside the lower shell 15 so as to draw a circle slightly larger than the magneto-optical disk 9, and the height of the disk storage wall 41 is slightly higher than the thickness of the magneto-optical disk 9. Is formed. This disk storage wall 4
When the upper shell 13 and the lower shell 15 are combined, the upper edge of the disk storage wall 41 is
3 is in contact with the inner surface. As a result, a circular storage chamber is formed and separated from other components, thereby preventing the entry of dust and dust.

The boss receiving portion 43 is provided at four positions facing the screwing boss portion 29, and
And the lower shell 15 are screwed portions to be fixed.
The boss receiving portion 43 is formed of a boss receiving hole 43b having a short cylindrical shape and a hole having an inner space larger than an entrance in a central portion, and a through hole 43a is provided on a bottom surface thereof.
The boss receiving portion 43 has a boss receiving hole 43b whose tip portion is formed larger than the root.
Are fitted to each other to temporarily fix the screws. In this state, the screws are screwed into the screw holes 29a while being passed through the through holes 43a, so that the upper shell 13 and the lower shell 15 are completely connected. It is possible to fix. The biasing member fixing portion 45 is a short ridge wall for supporting one end of the biasing spring member 11. The case side wall 47 is provided on each of the three sides except the side where the long opening 31 is provided, and forms a side wall as shown in FIG. The case side edge wall 47 includes the lower shell 15 and the upper shell 1.
When three are combined, the case 3 has three side surfaces excluding the mounting surface of the shutter 7. The case concave portions 49 are provided at upper portions of two sides corresponding to both sides of the side where the long opening 31 of the case side edge wall 47 is provided. This case recess 4
Reference numeral 9 is used to fix the disk cassette 1 at a predetermined position when the disk cassette 1 is mounted on a disk driver.

FIG. 4A shows the slider 5.
4A is a front view, FIG. 4B is a plan view, and FIG.
Is a left side view, and FIG. 4D is a right side view. Slider 5
Is composed of a slider body 51, a shutter fixing portion 53, and respective supporting portions 55, 57, 59, 61, 63 for enabling the slider 5 to slide in the longitudinal direction.

As shown in FIG. 4, the slider 5 has a first support portion 55 at the lower right end and a second support portion 55 at the upper right end as viewed in the drawing.
It has a support portion 57 and a fifth support portion 63, and the elongated slider body 51 supports them. The slider main body 51 is provided with a shutter fixing portion 53 at the left half as viewed in the drawing, and a third support portion 59 and a fourth support portion 61 are provided at the lower left end thereof.

The shutter fixing section 53 is provided for fixing the shutter 7 and the slider 5. The shutter fixing portion 53 includes an upper surface portion 7b of the shutter 7 shown in FIG.
A first shutter engaging portion 53a and a second shutter engaging portion 53b are provided so that the upper surface metal claws 71 and the side metal claws 73 provided on the short side portion 7a and the short side portion 7a can cooperatively engage with each other. I have. The first support portion 55 includes a first guide ridge 23 a of the upper shell 13 and a guide groove 3 of the lower shell 15.
7 respectively. The second support portion 57 contacts the second guide wall 25b of the upper shell 13 from above. The third support portion 59 contacts the second guide ridge 23b of the upper shell 13 from below. The fourth support portion 61 contacts the guide ridge 35 from below. The hook-shaped fifth support portion 63 abuts so as to sandwich the slider guide rail 39. In this way, the sliders 5 can be stably slid in the case 3 by the support portions 55 to 63. The slider 5 is provided with a groove for fixing the urging spring member 11 and an urging member fixing portion 65.

FIG. 5 shows the shutter 7. FIG.
5 (a) is a front view, FIG. 5 (b) is a plan view, FIG. 5 (c) is a right side view, FIG. 5 (d) is a rear view, and FIG. 5 (e) is an AA sectional view (enlarged view). It is. The shutter 7 is made of a rigid material such as a metal, and has a cross section taken from two side portions (short side portion 7a and long side portion 7c) and one upper surface portion 7b connected to the two side portions 7a and 7c. It is formed in a U-shape. In the shutter 7, an upper surface claw 71 is provided on an upper surface portion 7b, and a side surface claw 73 is provided on a short side surface portion 7a.

The shutter 7 is made of metal, and has two side portions (short side portion 7a and long side portion 7c) and one top portion 7a.
b is formed in a U-shaped cross section. This shutter 7
, An upper surface metal claw 71 is provided on the upper surface portion 7b, and a side metal claw 73 is provided on the short side surface portion 7a so as to be curved inward and extend.

FIG. 6 is a sectional view showing how the shutter 7 and the slider 5 are fixed. First of all, FIG.
As shown in FIG.
Insert Next, as shown in FIG. 6B, the shutter fixing portion 53 of the slider 5 pushes down the side claw 73. When the insertion is further advanced, as shown in FIG. 6C, the shutter fixing portion 53 pushes down the tip of the upper surface claw 71 of the shutter 7. Finally, as shown in FIG. 6D, the upper surface claws 71 and the side surface claws 73 of the shutter 7 are restored by their elasticity, and the first and second shutter engaging portions 53 a and 53 are respectively restored.
3b. Thus, the shutter 7 and the slider 5 are fixed.

FIG. 7 shows the first arm member 111 and the second arm member 113 of the biasing spring member 11. FIG.
7A is a front view of the first arm member 111, FIG. 7B is a sectional view taken along the line AA, FIG. 7C is a front view of the second arm member 113, and FIG. It is A sectional drawing. The biasing spring member 11 includes a first arm member 111, a second arm member 113, a compression spring 115 described later, and the like.

The biasing spring member 11 includes a first arm member 11
1, a second arm member 113, a compression spring 115, and the like. The first arm member 111 is formed in a long shape with a rigid polycarbonate resin. The first arm member 111 includes a slider contact portion 121, a reinforcing wall 123, and a spring engagement boss 1.
25, a first shaft attaching portion 127, a shaft mounting hole 129, a concave portion avoiding curved portion 131, and the like.

The slider contact portion 121 contacts and is fitted to the urging member fixing portion 65 of the slider 5 shown in FIG.
Thus, the biasing spring member 11 can apply a biasing force to the slider 5 via the first arm member 111. The reinforcing wall 123 is a wall for reinforcing the first arm member 111 so as not to be easily deformed by an external force. The boss 125 for spring engagement is provided with the compression spring 11 shown in FIG.
5 is an engaging boss for engaging the first engaging portion 161 as shown in FIG. The first shaft mounting portion 127 is formed by fitting the second shaft mounting portion 149 of the second arm member 113 into the shaft mounting hole 129 so that the first arm member 111 and the second arm member 113 are connected to the second arm member. It is a supporting portion for pivotally attaching the pivotable pivoting portion 145 around the pivotable portion 113. The concave portion avoiding curved portion 131 is formed to be curved so as to avoid the case concave portion 49 of the lower shell 15 when the urging spring member 11 is mounted on the disk cassette 1.

The second arm member 113 is made of a rigid polycarbonate resin and formed in an elongated shape. Second arm member 113
Are the case contact portion 141, the reinforcing wall 143, the swing shaft attaching portion 1
45, a groove 147 for spring engagement, a second shaft attaching portion 149, a curved portion 151 for avoiding a concave portion, and the like.

The case contact portion 141 contacts the urging member fixing portion 45 of the lower shell 15 shown in FIG. As a result, the biasing spring member 11 is swingably supported about the case contact portion 141 via the second arm member 113, and applies a biasing force to the slider 5 via the first arm member 111. Has become possible. The reinforcing wall 143 is connected to the second arm member 113.
Is a wall for reinforcing so that it is not easily deformed by external force. The swing shaft attaching portion 145 is formed by fitting the second shaft attaching portion 149 of the second arm member into the first shaft attaching portion 127 of the first arm member 111, and thereby the first arm member 111 and the second arm member 11
3 is a swing shaft attaching portion for swingably attaching the shaft 3 to the swing shaft. The concave portion avoiding curved portion 151 is formed to be curved so as to avoid the case concave portion 49 of the lower shell 15 when the urging spring member 11 is mounted on the disk cassette 1.

FIG. 8 shows the first arm member 111 and the second arm member 11.
3 shows a state where the shaft 3 is attached to the shaft. FIG. 8A is a plan view of a state in which the shaft is mounted, and FIG. 8B is a front view thereof. As described above, the first arm member 111 and the second arm member 113 are pivotally mounted around the pivot shaft mounting portion 145.

FIG. 9 is a front view of the compression spring 115 acting as a biasing force of the biasing spring member 11. In the present embodiment, SU having a thickness t of 0.4 mm and a width of 3 mm is used as the compression spring 115.
S304 is used. In addition, the center diameter is 3 mm and the number of windings is 3 to 5. The compression spring 115 has a first engagement portion 161 at an outer end and a second engagement portion 163 at a center portion. The first engagement portion 161 is provided with a boss 125 for spring engagement of the first arm member 111. , And the second engagement portion 163 is engaged with the spring engagement groove 147 of the second arm member 113.

FIG. 10 shows a first arm member 111, a second arm member 113 and a compression spring 11
5 shows a state in which the angle θ made against the urging force is narrowed. When the biasing spring member 11 is mounted between the slider 5 of the disk cassette 1 and the case 3, the slider 5 is slid to the opening with the slider 5 mounted on the case 3, and the jig or Position angle θ by human hand
Is inserted from the compression spring 115 side. Then, the slider contact portion 121 of the first arm member 111 is attached to the urging member fixing portion 65 of the slider 5, and the case contact portion 141 of the second arm member 113 is attached to the urging member fixing portion 45 of the lower shell 15. .

FIG. 11 shows that the disk cassette 1 is mounted on the disk driver and the slider 5 mounted on the case 3
Shows the state of sliding from the closed position to the open position. FIG. 11A shows a state in which the slider 5 mounted inside the case 3 is in the closed position. Slider 5
Of the slider body 51 by the regulating wall 33 of the case 3
It is firmly supported so that it does not come off. FIG.
FIG. 1B shows a process in which the slider 5 slides from the closed position to the open position. Since the slider body 51 is fixed by the regulating wall 33, the slider 5 does not come off during sliding. FIG.
(C) shows the state when the slider 5 has reached the lid opening position. Also in this figure, the slider body 51
The slider 5 is mounted inside the regulating wall 33, and the slider 5 does not come off the case 3. In addition, as described above, the sliding of the slider 5 is further ensured by the support portions 55 to 63 of the slider 5 being in contact with the respective portions of the case 3.

When the disk cassette 1 is mounted on the disk driver, the slider 5 is slid to the open position against the urging force of the urging spring member 11 as described above.
When the disk cassette 1 is removed from the disk driver, the biasing force of the biasing spring member 11 acts, and the slider 5 slides to the closed position.

As described above, according to the urging spring member 11 and the disc cassette 1 of the present embodiment, the first arm member 111 and the second arm member 113 constituting the urging spring member 11 are made of rigid polycarbonate. Even if the urging spring member 11 is temporarily fixed to the case 3, the urging spring member 11 does not bend due to external impact, vibration, or the like. There is no such thing as going out.

According to the biasing spring member 11, the biasing force can be imparted with sufficient strength even in a narrow space in the case 3, and the use durability is particularly excellent. The service durability of the spring is stronger as the spring width is larger and the winding radius is larger as the spring thickness is the same. In this respect, the compression spring 115 used for applying the urging force in this embodiment has a sufficient width and a sufficiently large center winding radius. Disc cassette 1
To slide every time it is put in the disk driver,
It is necessary to endure a very large number of uses, and the compression spring 115 of this embodiment is also suitable in terms of durability. For example, in a torsion spring, the wire diameter is 0.4 mm, the winding diameter is 5.0 mm,
Although the number of windings is limited to 4 to 5 and the durability at this time is up to 30,000 to 40,000, the compression spring 115 can withstand 60 to 70,000 use.

Further, since the first arm member 111 and the second arm member 113 constituting the biasing spring member 11 are made of a polycarbonate resin, they are more powdery during sliding than when metal and resin are rubbed. Are less likely to occur, and the magneto-optical disk 9 and the disk driver are not damaged.

In the conventional torsion spring, it is necessary to deform the arm so that the arm does not hit the case recess 49 and the arm does not protrude from the upper part of the case 3. In order to be deformed by a machine or the like into a shape that satisfies this requirement, it has been manufactured by an extremely expensive assembly process due to problems such as the number of times of bending and angle. In this regard, according to the present embodiment, since the first arm member 111 and the second arm member 113 are made of resin, they can be easily formed by injection molding or the like.
It is very easy to achieve a shape that serves the desired purpose. These first arm member 111 and second arm member 1
13 is preferably made of resin in order to prevent generation of powder due to rubbing, but may be formed of a rigid metal or the like in some cases.

The biasing spring member 11 of this embodiment can be applied to a case and a slider designed and formed on the premise of a conventional torsion spring by simply replacing the case and the slider without any change. There is also an effect. Further, the first arm member 111 and the second arm member 113
Various methods can be considered for engaging the case 3 with the case 3 and the slider 5, such as providing a boss shaft on one side and providing a hole to be fitted into the boss shaft on the other side.

In this embodiment, a compression spring is used as the spring. However, a spring having a rigid arm with a conventional torsion spring or a leaf spring made of metal or resin may be used. Is also good.

[0038]

As described above in detail, the shutter biasing spring member of the disk cassette according to the first invention is formed of a rigid material and does not bend even when subjected to an external impact. Therefore, in the disc cassette of the second invention using the shutter biasing spring member, also in the disk cassette was temporarily fixed, never spring is out, which is mounted between the slider and the case.

[Brief description of the drawings]

FIG. 1 is an overall view of a disk cassette as one embodiment of a second invention.

FIG. 2 is an explanatory view showing the upper shell;
(A) is a front view, (b) is a plan view, (c) is an AA end view, and (d) is a BB enlarged end view.

FIG. 3 is an explanatory view showing the lower shell;
(A) is a front view, (b) is a plan view, (c) is an AA enlarged end view, and (d) is a BB enlarged end view.

FIG. 4 is an explanatory view showing the slider, and FIG.
Is a front view, (b) is a plan view, (c) is a left side view, (d)
Is a right side view, (e) is an AA end face, (f) is a BB end view, (g) is a CC end view, (h) is a DD end view,
(I) is an EE end view.

FIG. 5 is an explanatory view showing the shutter, and FIG.
Is a front view, (b) is a plan view, (c) is a right side view, (d)
Is a rear view, and (e) is an AA enlarged end view.

FIGS. 6A and 6B are explanatory views showing a state in which a shutter is mounted on the case, FIG. 6A is an explanatory view showing a state before mounting, FIG. 6B is an explanatory view showing the process of mounting,
(C) is an explanatory view showing a later stage of the attachment, and (d) is an explanatory view showing a state where the attachment is completed.

FIG. 7 is an explanatory view of a first arm member and a second arm member of a biasing spring member as one embodiment of the first invention; FIG.
Is a front view of the first arm member, FIG.
(C) is a front view of the second arm member, and (d) is an AA cross-sectional view thereof.

FIGS. 8A and 8B are explanatory views showing a state in which a first arm member and a second arm member of a biasing spring member are pivotally mounted. FIG. It is a front view.

FIG. 9 is a front view of a compression spring of the biasing spring member.

FIG. 10 is a front view showing a state in which a first arm member, a second arm member, and a compression spring are assembled as an urging spring member, and an angle formed against the urging force is reduced.

11A and 11B are explanatory views showing a state in which a slider mounted on a case slides, wherein FIG. 11A is an explanatory view showing a closed state, and FIG. FIG. 4 is an explanatory view showing a process, and FIG.

[Explanation of symbols]

1 ... disk cassette, 3 ... case, 5 ...
Slider, 7 shutter, 9 magneto-optical disk, 11 urging spring member, 13 upper shell, 15 lower shell, 45 urging member fixing portion , 47 ... case side edge wall, 49 ... case recess,
65: urging member fixing portion, 111: first arm member,
113: second arm member, 121: slider contact portion, 123: reinforcing wall, 125: engagement boss, 1
27: first shaft mounting portion, 129: shaft mounting hole, 131
... Curved portion for avoiding concave portion, 141 ... Case contact portion,
143: Reinforcement wall, 145: Oscillating shaft attachment part, 147
... engaging groove, 149 ... second shaft attaching part, 151 ...
・ Curved portion for avoiding concave portion, 161, first engaging portion, 163
... Second engaging portion

Claims (4)

(57) [Claims] 1. Two arm members formed of a rigid material in an elongated shape and pivotally mounted around a pivot shaft mounting portion at one end thereof, and the arm provided between the arm members. A spring for urging the arm member in a direction in which an angle formed by the member around the pivot shaft attaching portion is increased ;
A spring member for biasing a shutter of a disk cassette, comprising: 2. The spring member for biasing a shutter of a disk cassette according to claim 1, wherein said spring is a compression spring. 3. The spring member for biasing a shutter of a disk cassette according to claim 1, wherein the arm member is made of a synthetic resin. 4. A disk, a case for accommodating the disk, and an upper surface portion and two side portions connected to both sides of the upper surface portion are formed in a U-shaped cross section. A shutter slidably provided so as to sandwich the case by the side surfaces of the shutter, and a shutter fixed to the shutter and slidably supported by the case to open and close the shutter to the open position and the closed position. And a slider capable of reciprocating between the slider and the case, wherein the shutter biasing spring member of the disk cassette according to any one of claims 1 to 3 is disposed between the slider and the case. A disk cassette wherein the shutter slides while being urged from the open position to the closed position by being mounted.