JP2593404Y2 - Recording medium cartridge - Google Patents

Description

[Detailed description of the invention]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a recording medium cartridge for accommodating a recording medium such as a magnetic disk and an optical disk.

2. Description of the Related Art As shown in FIG. 3, a recording medium D such as a magnetic disk, a write-once optical disk, and a rewritable optical disk includes two upper and lower shells, an upper shell 51a and a lower shell 51b. The recording medium cartridge (hereinafter, also referred to as a cartridge) C is rotatably accommodated in the recording medium. Here, as shown in FIG. 4A, the corner K of the upper shell 51a
A concave portion 53a in which the write protect 52 is disposed as shown in FIG. 6 is formed.
a is formed, and by moving the write protect 52 in the vicinity of the opening 54a, writing of information on the recording medium D can be prohibited or the prohibition can be canceled. Also, as shown in FIG.
A concave portion 53b corresponding to the concave portion 53a of the upper shell 51a is also formed in 1b, and an opening 54b wider than the opening 54a is formed in this portion. That is, FIG.
As shown in FIG.
a, the leg 52a of the write protect 52 engages at one end of the raised portion 53c of the upper shell 51a (the write protect 52 moves to the protected position).
Thus, when the cartridge C is mounted on the disk drive, this state is detected, and writing of information to the recording medium D is prohibited. On the other hand, the write protect 52 moves the concave portion 53a to close the opening 54a,
The leg 52a of the write protect 52 is the upper shell 5
In the case of engagement (moving to the permit position) at the raised portion 53c of 1a, writing of information on the recording medium D is performed freely. By the way, the leg 52 of the write protect 52
Since the distal end locking portion, which is the end of a, protrudes outward,
Leg 52a of write protect 52 and upper shell 5
The state of contact with the raised portion 53c of 1a differs between when moving from the protect position to the permit position and when moving from the permit position to the protect position. For example, drop test (JI
SX 6271), the movement rate from the protected position in FIG. 5A to the permit position in FIG. 5B is 20%, while the reverse movement from the permit position to the protected position is performed. The transfer rate is 60%. Here, the reason why the movement rates in the drop test are different is that, in the state of FIG. 5A, the component force applied to the leg 52a of the write protect 52 at the time of the drop movement acts in a direction to push the leg 52a right and left,
From the protect position to the permit position, the leg portion 52a is pushed out to the inner wall of the upper shell 51a, and the write protect 52 is difficult to move, whereas in the state of FIG. It is considered that this is because it is easy to move from the permit position to the protect position by the opposite operation. As described above, because the force required for movement is different, as a measure to prevent the movement of the write protect at the time of the drop test, if the elasticity of the legs of the write protect is increased or backlash is performed, the position of the protect from the protect position is particularly increased. It is very difficult to move to the airport.

[Object of the Invention] Accordingly, the present invention reduces the movement rate of each of the protect position → permit position and the permit position → protect position, that is, the degree of mobility of each, to the same extent, thereby reducing the degree of mobility of write protection in both directions. It is an object of the present invention to provide a recording medium cartridge having substantially the same size.

In order to achieve the above object, a recording medium cartridge according to the present invention is provided with a leg which is urged so as to press the wall surface of a recess in a recess formed inside a shell. 2. It is provided with write protect
A 5 inch recording medium cartridge, wherein a slanted ridge is provided along the side wall surface of the concave portion in the moving direction of the write protect, and a tip end locking portion of the leg is positioned on one of both end sides thereof; And the height difference between both ends of the oblique ridge is 0.1 to
0.3 mm, and the degree of movement of the distal end locking portion is substantially the same in both directions. In another recording medium cartridge of the present invention, two protrusions are arranged in the direction of movement of write protection along the side wall surface of the concave portion, and one of the protrusions serves as a tip end locking portion of a leg. And the height difference between these protrusions is 0.1 to 0.3 m.
The characteristic feature is that the degree of movement of the front end locking portion is substantially the same in both directions as m.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described in detail with reference to the drawings according to the present invention. The main structure of the recording medium cartridge according to the present invention is substantially the same as the conventional one described in FIG. 3, and the cartridge is composed of two upper and lower shells formed by injection molding of a flat polycarbonate resin, that is, an upper shell. A 3.5-inch optical disk as a recording medium is rotatably accommodated between the lower shell and the lower shell. FIG.
As shown in (a) and (b), the concave portion 3a of the upper shell 1a according to the first embodiment of the present invention is provided with an opening 4a and an oblique raised portion 3c having a length of about 4 mm for positioning. . The inclined protruding portion 3c is provided at the other end 3q engaged at the permit position from the one end 3p engaged at the protect position with the tip end locking portion of the leg portion of the write protect (having the same configuration as that shown in FIG. 6). Is slightly protruding, and there is a difference of about 0.1 mm in this embodiment, but a suitable numerical range is about 0.1 to 0.3 mm when the oblique ridge 3c is formed of a resin such as polyacetal. is there. FIG.
As shown in (a) and (b), the concave portion 13a of the upper shell 11a according to the second embodiment of the present invention is provided with an opening 14a and four positioning protrusions 13c of about 1 mm in length. ing. In this projection 13c, the projection 13q at the other end engaged at the permit position is slightly more protruding than the projection 13p at the one end where the tip locking portion of the leg of the write protect engages at the protection position. 2, there is a difference of about 0.1 mm, and the appropriate numerical range is 0.1 to
It is about 0.3 mm. In the second embodiment, a plurality of protrusions are provided to form the intermediate holding region 13m. Such an intermediate holding area can function effectively in the following points. That is, for example, when assembling two upper and lower shells together, the write protect is assembled at a predetermined position (protect position) of the concave portion 13a of the upper shell 11a by an automatic assembler or the like. Is sent to the next process by a transfer device such as an automatic assembly machine.
At this time, since the leg portion of the write protect is provided in the intermediate holding region, the mounting accuracy of the write protect can be made lower than in the first embodiment. next,
In the above Examples 1 and 2, drop tests (each corner (4 places) of the shell and each face (6 faces) of the shell face down) were performed on five or more samples in which the write protect was fixed at the protect position and the permit position. (Total of 10 conditions), approx. 76
When the camera was dropped naturally from a height of 0 mm onto a concrete floor covered with a vinyl sheet of about 2 mm thickness, and the shutter movement rate (movability) was measured, the results shown in Table 1 were obtained. .

[Table 1] As described above, in the conventional example, when the fixed position was the permit position, there was a difference of about 40% as compared with the case where the protected position was set. However, in the first and second embodiments, both were substantially constant regardless of the fixed position. Was. This is because the other end 3q is more protruded than the one end 3p of the oblique ridge 3c, or the protrusion 1
It is considered that the force applied to the legs in the movement of the write protection from the protect position to the permit position, or from the permit position to the protect position, was substantially the same by protruding the protrusion 13q located at the other end from 3p. Next, a drop test similar to the above was performed using a light-protected leg with a thicker leg with increased elasticity. In Examples 1 and 2, the transfer rate was almost 0%.
If the thickness of the leg portion of the write protect is further increased to improve the elasticity in order to prevent the movement of 10% in the conventional example, the movement of the write protect becomes difficult, and the movement rate is further reduced. It was difficult.

As described above, according to the recording medium cartridge of the present invention, it is a 3.5-inch recording medium cartridge in which the oblique ridge is formed along the side wall surface of the concave portion in the moving direction of the write protection. By providing the tip locking portion of the leg on one of the two ends, and by setting the height difference between the two ends of the oblique ridge to 0.1 to 0.3 mm, the write protect position can be changed from the write protect position. The force required to move to the permit position and the force required to move from the permit position to the protect position can be equalized. The reliability can be greatly improved compared to the related art. Further, by improving the elasticity of the leg member of the write protect, the movement rate of the write protect can be reduced to 0%. Another recording medium cartridge of the present invention is a 3.5-inch recording medium cartridge in which two protrusions are arranged along the side wall surface of the concave portion in the moving direction of the write protection. Similarly, by positioning the tip locking portion of the leg with one protrusion and setting the height difference of these protrusions to be 0.1 to 0.3 mm, the degree of movement of the tip locking portion can be similarly changed in both directions. By making them approximately the same, the reliability of the recording medium cartridge can be greatly improved as compared with the related art.

[Brief description of the drawings]

FIG. 1A is a plan view in which a part of a shell according to a first embodiment of the present invention is enlarged, and FIG. 1B is a plan view in which a diagonal ridge in FIG. 1A is further enlarged.

FIG. 2A is a plan view in which a part of a shell according to a second embodiment of the present invention is enlarged, and FIG. 2B is a plan view in which a protrusion of FIG.

FIG. 3 is a sectional view of a recording medium cartridge.

FIGS. 4A and 4B are diagrams illustrating two upper and lower shells of a conventional recording medium cartridge. FIG. 4A is an inner plan view of an upper shell, and FIG. 4B is an inner plan view of a lower shell.

FIG. 5 is an enlarged view of a part (K portion) of a conventional shell, where (a) is a plan view showing a write protect position and (b) is a plan view showing a write protect permit position. .

6A and 6B are diagrams showing write protection according to the present invention, wherein FIG. 6A is a plan view, FIG. 6B is a sectional view taken along line XX of FIG. 6A, and FIG. 6C is a sectional view taken along line YY of FIG. .

[Explanation of symbols]

51a ... upper shell 51b ...
Lower shell 52 ··· Write protect 53a ···
Recess 3a ... Recess 3c ...
Inclined protrusion 4a Opening 13c, 13p, 13q Projection C Cartridge for recording medium D Optical disk (recording medium)

Claims (2)

(57) [Scope of request for utility model registration] 1. A within a recess formed on the inside of the shell, the recess
What is claimed is : 1. A 3.5-inch recording medium cartridge comprising a write protect having legs urged to press a wall surface.
An inclined ridge is provided in the direction of movement of the protect,
Position the distal end locking portion of the leg portion on one of the
The height difference between both ends of the oblique raised portion is 0.1 to 0.3 mm.
And the degree of movement of the tip locking part is almost the same in both directions.
A recording medium cartridge characterized by the above-mentioned features. 2. A write protect along the side wall surface of the recess.
Arrange the two protrusions in the movement direction of
Position the distal end locking portion of the leg with the projection, and
The height difference between the projections is 0.1 to 0.3 mm,
2. The recording medium cartridge according to claim 1, wherein the degree of movement of the stop is substantially the same in both directions .