JP3603972B2 - Disk cartridge - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a disk cartridge used as a recording medium of a computer device or the like, and more particularly, to a disk cartridge for improving the moldability of a half forming a cartridge case.
[0002]
[Prior art]
FIG. 7 is a perspective view showing an example of a conventional disk cartridge. The disk cartridge 101 is configured by rotatably storing an optical disk 105 in a cartridge case 104 formed by a pair of upper and lower synthetic resin halves 102 and 103 facing each other. The head access window 106 and the motor access window 107, a shutter 108 for opening and closing the head access window 106 and the motor access window 107, a spring 109 for elastically urging the shutter 108 in the closing direction, and a member for fixing the disk cartridge 101 to a device such as a floppy disk drive are inserted. Insertion slot 110, a positioning hole 111 and an alignment hole 112 for inserting a pin for positioning the disk cartridge 101 on the device, and a gripper slot 1 for inserting a grip of an autochanger mechanism of the device. It has a 3, and the like.
[0003]
[Problems to be solved by the invention]
The conventional disk cartridge as described above has a problem that the moldability of the halves 102 and 103 forming the cartridge case 104 is poor. The halves 102 and 103 are integrated by screwing or ultrasonic welding. In the case of screwing, a plurality of recesses 114 for embedding a screw head are provided on the outer surface side of one half. On the other hand, in the case of ultrasonic welding, bosses for welding are provided on the inner surfaces of the halves 102 and 103. There is a case where a concave portion for stealing meat is provided at a position on the back side of the vehicle.
[0004]
Such a concave portion is formed by a projection provided on a movable mold of a mold for injection-molding a half, but when the movable mold has such a projection, when the mold is opened after injection molding of the half. If the half is not sufficiently cooled, the friction between the projection and the recess is large, so that the projection cannot be smoothly pulled out of the recess, and the recess is pulled by the projection and the periphery of the recess becomes a mold. In some cases, the mold was released from the fixed mold and deformed, resulting in poor moldability. Further, in order to avoid this as much as possible, the cooling time of the half must be lengthened, and in such a case, the moldability of the half becomes very poor.
[0005]
In addition, the above-mentioned problem also exists in places other than the above-mentioned place. For example, in the disk cartridge shown in FIG. 7, the insertion slot 110, the positioning hole 111, the alignment hole 112, and the gripper slot 113 are inserted from the outer surface side of the half into the pins and grips of the device. A chamfer must be formed and must be formed by a projection on the movable mold side. Therefore, if the cooling time of the half is short, the projections do not come off smoothly at the time of opening the mold, and there is a possibility that the peripheral portion may be deformed, and this also contributes to prolonging the cooling time of the half. .
[0006]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a disk cartridge in which the moldability of a half forming a cartridge case is improved.
[0007]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the invention according to claim 1 is directed to a disk cartridge in which a disk-shaped recording medium is rotatably housed in a cartridge case formed by a pair of upper and lower synthetic resin halves facing each other. At least one of the halves has a peripheral portion formed by a projection provided on a movable mold of a mold for injection molding the half, and a fixed mold of the mold when the mold is opened. The fixing means is provided at least at the periphery of the insertion slot or the gripper slot so as not to be released from the mold.
[0008]
According to a second aspect of the present invention, in the first aspect of the present invention, the mold is released from the fixed mold in a peripheral portion of a portion formed by a projection provided on a movable mold of a mold for injection-molding the half. For this purpose, at least a part of the surface on which the draft angle is formed is formed with a ridge extending in the mold opening direction of the mold, and this is used as the fixing means.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.
1 is a diagram of a disk cartridge according to an embodiment of the present invention viewed from the front side, FIG. 2 is a diagram of the disk cartridge of FIG. 1 viewed from the back side, FIG. 3 is a diagram of the upper half viewed from the back side, 4 is a view of the lower half viewed from the back surface side, FIG. 5 is an enlarged view of a portion A of FIG. 4, and FIG. 6 is a view taken along line BB of FIG.
[0012]
The disc cartridge 1 shown in FIGS. 1 and 2 comprises a cartridge case 4 formed of a pair of upper and lower synthetic resin halves 2 and 3 facing each other, and an optical disc 5 is rotatably housed therein. Reference numeral 3 is integrated by ultrasonic welding. The half 2 has a head access window 6 formed therein, and the half 3 has a head access window 6 and a motor access window 7 formed therein. Reference numeral 8 denotes a shutter for opening and closing the head access window 6 and the motor access window 7, and is elastically urged in the closing direction by a spring 9. 10 is an insertion slot, 11 is a positioning hole, 12 is an alignment hole, and 13 is a gripper slot.
[0013]
As shown in FIGS. 3 and 4, the insertion slot 10 includes a first insertion slot forming portion 10 a provided in the upper half 2 and formed of a semicircular notch whose bottom is closed, and a semicircle provided in the lower half 3. The gripper slot 13 is formed in the upper half 2 and the first gripper slot forming portion 13a formed of a rectangular notch and the lower half 3 is formed by the second insertion slot forming portion 10b formed of the notch. And a second gripper slot forming portion 13b formed of a rectangular notch.
[0014]
As shown in FIG. 5, a plurality of protrusions extending in a mold opening direction of a mold for injection-molding the lower half 3 are provided on the outer peripheral surface of the arc-shaped rib 14 around the second insertion slot forming portion 10b. A ridge 14a (fixing means) is formed. The second insertion slot forming portion 10b is formed by a protrusion provided on the movable die for the reason described in the section of the prior art. By providing the ribs 14 with the protruding ridges 14a, the frictional force between the fixed die and the ribs 14 is increased, so that the peripheral portion of the second insertion slot forming portion 10b is difficult to release from the fixed die when the die is opened. Become.
[0015]
Since the first and second gripper slot forming portions 13a and 13b are also formed by the protrusions provided on the movable die, the outer peripheral surfaces of these peripheral ribs 16 and 17 also have the mold opening directions of the die respectively. Ridges 16a and 17a are formed. Since the first insertion slot forming portion 10a has a bottom, it is formed by a projection provided on a fixed mold. Therefore, no rib is formed on the peripheral rib 18.
[0016]
As shown in FIG. 3, cylindrical bosses 19 for ultrasonic welding are provided at positions near the four corners of the inner surface of the half 2, and as shown in FIG. Are provided with fitting portions 20 that fit into the bosses 19 at positions corresponding to the bosses 19. As shown in FIG. 6, the fitting portion 20 has a cylindrical peripheral wall 21 and an annular rib 22 having a triangular cross section and provided on the bottom of the peripheral wall 21 and protruding toward the inner surface of the half 3. I have. The inner diameter D of the peripheral wall 21 is slightly smaller than the outer diameter of the boss 19 so that the boss 19 is fitted. Further, the diameter d of the leading edge of the rib 22 is larger than the inner diameter of the boss 19, and when the halves 2 and 3 are overlapped, the leading edge of the boss 19 abuts on the leading edge of the rib 22, and the ultrasonic wave When vibration is applied to the boss 19 by a welding machine, the leading edge of the rib 22 and the leading end surface of the boss 19 rub against each other and are welded to each other. The outer peripheral surface 21a of the peripheral wall 21 is inclined by about 2 ° with respect to the mold opening direction so as to form an undercut (fixing means).
[0017]
At the positions inside the ribs 22 and on the outer surface of the half 3 on the back side of the fitting portion 20, recesses 23 and 24, which are burglars, are provided to improve the flow of the resin in the fitting portion 20. . The concave portion 24 on the outer surface side of the half 3 is formed by a projection provided on the movable die. By making the outer peripheral surface 21a of the peripheral wall 21 undercut, the frictional force between the fixed die and the outer peripheral surface 21a increases. Therefore, it is difficult for the peripheral portion of the concave portion 24 to be released from the fixed mold when the mold is opened.
[0018]
On the inner surface of the half 3, annular ribs 25 and 26 are provided around the positioning hole 11 and the alignment hole 12, respectively. The positioning hole 11 and the alignment hole 12 are also formed by protrusions provided on the movable mold. Therefore, the outer peripheral surfaces of the ribs 25 and 26 are also undercut with an inclination angle of 2 °, like the outer peripheral surface of the peripheral wall 21.
[0019]
In the present embodiment, the second insertion slot forming portion 10b, the first and second gripper slot forming portions 13a and 13b, the meat stealing recess 24 provided on the back side of the fitting portion 20, the positioning hole 11 are provided. Although the case where the fixing means is provided around the alignment hole 12 has been described, the fixing means can also be provided around the other part formed by the projection provided on the movable die.
[0020]
Further, the fixing means does not need to be provided at all of the peripheral portion of the portion formed by the movable projection, and may be provided only at a portion which is easily released when the mold is opened.
[0021]
【The invention's effect】
As described above, according to the present invention, the periphery of the portion formed by the projection provided on the movable mold of the mold for injection molding the half is fixed when the mold is opened. By providing the fixing means for preventing the mold from being released from the mold, the cooling time of the half can be reduced, and the moldability of the half is improved.
[Brief description of the drawings]
FIG. 1 is a diagram of a disk cartridge according to an embodiment of the present invention as viewed from a front surface side.
FIG. 2 is a view of the disk cartridge 1 of FIG. 1 as viewed from the back side.
FIG. 3 is a view of the upper half as viewed from the back side.
FIG. 4 is a view of the lower half as viewed from the back side.
FIG. 5 is an enlarged view of a portion A in FIG. 4;
FIG. 6 is a view taken along line BB of FIG. 4;
7A and 7B are perspective views showing an example of a conventional disk cartridge, wherein FIG. 7A is a view from the front side, and FIG. 7B is a view from the back side.
[Explanation of symbols]
1 Disk cartridge 2 Upper half 3 Lower half 4 Cartridge case 5 Optical disk (disk-shaped recording medium)
14a, 16a, 17a Ridge (fixing means)

Claims (2)

In a disk cartridge in which a disk-shaped recording medium is rotatably housed in a cartridge case formed by a pair of upper and lower synthetic resin halves opposed to each other,
In at least one of the halves, a peripheral portion of a portion formed by a projection provided on a movable mold of a mold for injection molding the half is separated from a fixed mold of the mold when the mold is opened. A disk cartridge characterized in that fixing means for preventing release is provided at least in the periphery of an insertion slot or a gripper slot . The metal mold is formed on at least a part of a surface where a draft for releasing from the fixed mold is formed around a portion formed by a projection provided on a movable mold of the mold for injection molding the half. 2. The disk cartridge according to claim 1, wherein a ridge extending in a mold opening direction of the mold is formed, and this is used as the fixing means.

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