JPS63291283A - Manufacture of cartridge for housing recording medium - Google Patents

Abstract

PURPOSE:To realize the smooth injection of resin and the high accurate shaping of a cartridge by providing a gate part for the injection of the resin on the side of the sliding area part of a opening/closing member, injecting the resin for shaping from this gate part toward the sliding area part and shaping the cartridge. CONSTITUTION:Upper and lower halfs 1 and 2 composing the cartridge 4 is shaped by injecting the synthetic resin from the gate part GP facing near the each corner part in a flat part area of the halfs 1 and 2 and the gate member GS facing the side of the inner circumference side of apertures 9 and 10 for a pickup being the side of the sliding member area 13 where a shutter 11 slides. That means, the gate part GS facing the side of the inner circumference side of the apertures 9 and 10 for the pickup is provided not to be faced to the inside of the surface of the sliding member area 13 closely shaped and to pour the synthetic resin for shaping toward the for said sliding member area 13. Then the upper and lower halfs 1 and 2 are shaped by injecting the synthetic resin for shaping from this gate part GS. Thus the resin can be smoothly injected to the inside surface of the sliding member area 13 without leaving the trace of the injection.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Industrial Application Field The present invention relates to an optical disc on which a predetermined information signal can be recorded;
Regarding a method of manufacturing a cartridge in which a recording medium such as a magneto-optical disk is housed, in particular, a cartridge to which an opening/closing member is attached that opens and closes an opening that exposes a part of the housed recording medium to the outside is manufactured by injection molding of synthetic resin. The present invention relates to a manufacturing method for manufacturing.

B0 Summary of the Invention The present invention provides a method for manufacturing a cartridge in which a recording medium such as an optical disk or a magneto-optical disk is housed. By providing a gate portion and injecting molding resin from the gate portion toward the sliding area, molding accuracy is improved and the appearance is improved. be.

C9 Prior Art Conventionally, a recording medium such as an optical disk or magneto-optical disk on which a predetermined information signal has been recorded or has been recorded is stored in a cartridge, and the cartridge is loaded into a recording and/or reproducing device with the recording medium stored in the cartridge. However, a disk cartridge is used in which information signals recorded on the recording medium are successively output or information signals are written onto the recording medium.

As this type of disk cartridge, for example, one constructed as shown in FIGS. 3 and 4 is known.

As shown in FIGS. 3 and 4, this disk cartridge consists of a rectangular upper half 1 and a lower half 2 formed by molding synthetic resin using a molding machine, butted against each other, and a plurality of screws 3. Cartridge 4 which is connected and fixed by
An optical disc 5 on which a predetermined information signal can be recorded or a predetermined information signal has been recorded is rotatably housed inside the disc. At the center of the upper and lower halves 1.2 constituting the cartridge 4, a chucking hub 6 provided at the center of the optical disc 5 stored therein faces outward, and the optical disc 5 is rotated. A chuffing mechanism insertion lower 8 is formed into which a disk table of a disk rotation drive device to be operated and a chucking mechanism for integrally holding the optical disk 5 are inserted into the disk table. Further, in the upper and lower half halves 1.2, a signal recording section 5a of the optical disk 5 is arranged radially outwardly in the direction of the front edge of the cartridge 4, continuing from the chucking mechanism insertion lower and 8. Please, the above optical disc 5
A pickup opening 9 facing a pickup device serving as an information signal writing and/or reading means for writing a predetermined information signal or successively outputting a written information signal.
．． 10 are formed.

Further, the cartridge 4 is designed to prevent dust and the like from entering the cartridge 4 through the chucking mechanism insertion hole 7.8 and the pickup opening 9°10 and adhering to the optical disc 5 housed therein. To prevent this, a sliding shutter 11 is installed to open and close the chucking mechanism insertion hole 7.8 and the pickup openings 9 and 10. The shutter 11 is formed by bending a metal plate such as a thin stainless steel plate into a U-shape, and is disposed so as to fit on the outer surface of the cartridge 4, and between the front edge of the cartridge 4. It is fixed to a slide base 12 that is slidably engaged with the chucking mechanism in the lateral direction, and is slidably mounted together with the slide base 12 in the direction of opening and closing the chucking mechanism insertion lower 8 and the pickup opening 9.1. That is, the shutter 11 slides within a sliding SI region group 13 formed in an area extending to one side of the cartridge 4, including the periphery of the chucking mechanism insertion lower 8 and the pink-up opening 9.10.

Note that the slide base 1 to which the shutter 11 is fixed is
2 is a first rack gear 14 formed on the inner side of the slide base 12 and a second rack gear 14 provided on the lower half 2.
The shutter 11 is always connected to the chucking mechanism insertion lower 8 and the opening for the pink amplifier by the torsion spring 17 via an interlocking mechanism consisting of a rack gear 15 and a pinion gear 16 which is rotatably engaged between the rack gears 14 and 15. It is biased in a direction that closes portions 9 and 10.

Further, the lower half 2 constituting the cartridge 4 is provided with a shutter 11 when the shutter 11 is in the closed position.
A locking member 18 for locking the shutter 11 in the closed position is attached to the closed end of the shutter 11.

Then, the upper and lower halves 1. which constitute the cartridge 4 are arranged.
As shown in FIG. 5, gates (Or) for injecting the molding resin are exposed near each corner in the planar region of these halves 1.2, and from these gates (G,) It is molded by injecting synthetic resin. That is, the upper and lower halves 1.2 are molded using a mold device equipped with a bin point gate, as shown in FIG. In this mold device, a cavity 21 having a shape corresponding to the upper and lower halves 1 and 2 is constituted by an identification side mold plate 22 and a movable side mold plate 23. A synthetic resin for molding is injected into the cavity 21 from a sprue 24 for resin injection provided on the fixed side template 22 through a gate portion 26 provided through the runner part 25. The gate portion 26 is provided in the vicinity of each corner within the flat surface region of the upper and lower halves 1.2 to be molded, which are located H's on the flat surface of the cavity 21.
It is configured as a pinpoint gate.

D1 Problems to be Solved by the Invention By the way, in a disc cartridge that is installed in a recording and/or reproducing apparatus with the optical disc 5 stored in the cartridge 4, the shutter 11 attached to the cartridge 4 is It must be installed at least flush with the main plane without protruding from it. That is, when loading and unloading the disc cartridge into the recording and/or playback apparatus, the shutter 11 is
This is necessary in order to ensure that the opening and closing operations of the shutter 11 are performed smoothly without coming into contact with the mechanical parts or the loading/unloading guide parts on the side, and to ensure smooth opening and closing operations of the shutter 11.

Therefore, the shutter 11 slides into a sliding part 13 formed in a concave shape so that the amphibalic surface of the cartridge 4 is made thinner so that the thickness of the metal plate constituting the shutter 11 is equal to or at most the same depth. It is attached freely.

As described above, the upper and lower halves 1.2 constituting the cartridge 4 to which the shutter 11 is attached have a thin sliding area 1.
3 and other thick parts.

Further, since the upper and lower halves 1.2 constituting the cartridge 4 are for storing a disk such as an optical disk 5 which is relatively thin and has a large area, they are formed into a flat plate shape having a large area compared to the thickness. It becomes.

When molding the upper and lower halves 1.2 having such a configuration, the gate portions 26 are positioned near each relatively thick corner in the plane area of the upper and lower halves 1.2 to be molded as described above. When molding is performed by injecting synthetic resin into the cavity 21 from the gate part 26, it is difficult to smoothly inject the synthetic resin into the sliding part area 13 which is molded into a thin wall, resulting in variations in thickness. It is difficult to efficiently mold the parts to the desired precision by using methods such as molding. In particular, the sliding parts 13, which are molded thinly, are hardened before other thick parts. There is a risk that the curing time in each region will vary, resulting in a distorted shape rather than an accurate rectangular shape.

Furthermore, in the disk cartridge equipped with a mechanism for biasing the shutter 11 as described above, a torsion spring 17 for biasing the shutter 11 is provided on the inner surface of the upper and lower halves 1.2 corresponding to the sliding part area 13. A support pin that supports the slide base 12, a guide piece that guides and supports the slide base 12, etc. are integrally molded, but since the guide support pins, guide pieces, etc. are molded in the thin sliding area 13, there are no sinks during molding. and deformation are likely to occur. Therefore, it is difficult to perform highly accurate molding, and the mounting accuracy of the shutter 11 cannot be maintained with high precision, resulting in a disk cartridge that cannot guarantee smooth opening and closing operations of the shutter 11.

Therefore, in order to enable smooth injection of resin into the sliding part area 13 which is molded into a thin wall and to prevent deformation during molding, a gate part facing into the surface of the sliding part area 13 is provided. It is possible to increase the number of gate parts. However, if the number of gates is increased, a large number of injection groups of molding resin will be formed, which will spoil the appearance of the disk cartridge.In particular, if a gate is provided facing the inside of the sliding part area 13, this sliding part will be damaged. An injection group of the molding resin is formed within the plane of the class area 13. If this injection group is formed, it becomes impossible to form the sliding part area 13 into a smooth surface, and the problem of ensuring smooth opening and closing operations of the shutter 11 cannot be solved.

Of course, the upper and lower half 1 which is the storage side of the optical disc 5
, 2, which face each other. That is, in order to protect the optical disc 5, the inner surfaces of the upper and lower halves 1 and 2 need to be smooth surfaces.

Therefore, the present invention prevents the appearance of the cartridge from being damaged due to the formation of a large number of injection groups of molding resin on the exterior, and allows the cartridge to be molded with high precision without causing deformation or sink marks during molding. It is an object of the present invention to provide a method for manufacturing a cartridge that can be molded without causing deformation or sink marks, particularly in the sliding region on which the shutter slides, and that can ensure smooth opening and closing of the shutter.

Means for Solving the E0 Problem In order to achieve the above object, the present invention accommodates a recording medium such as an optical disk or a magnetic disk on which a predetermined information signal can be recorded, and at least a part of the recording medium is removed. In a method for manufacturing a cartridge for storing a recording medium, in which an opening facing toward the side is provided, and an opening/closing member such as a shutter for opening/closing the opening is attached, a side surface of a sliding area portion on which the opening/closing member slides; A gate section for resin injection is provided so that the molding resin flows out toward this sliding area, and the molding resin is injected through this gate section to mold the cartridge. .

F0 action The present invention provides a resin injection gate on the side surface of the sliding area that is thinner than other parts on which the opening/closing member slides, so that the molding resin flows out toward this sliding area. Since the cartridge is molded by injecting molding resin gold through this gate, the resin can be injected smoothly without leaving injection marks on the surface of the thin sliding area. Guaranteed.

G. Example Hereinafter, the method of the present invention will be described in which an optical disc 5 is housed in the cartridge 4 described above, and a shutter 11 which is an opening/closing member for opening and closing the chuffing mechanism insertion lower, 8 and pickup openings 9 and 10 is installed in the cartridge 4. A specific example will be described in which the present invention is applied to a disk cartridge configured by slidably attaching the present invention.

In the method of the present invention, the upper and lower halves 1.2 constituting the cartridge 4 have gate portions (GP) facing near each corner portion within the planar area of these halves 1.2, as shown in FIG. ) and a gate member facing the inner circumferential side of the pickup opening 9.10, which is the side of the sliding member area 13 on which the shutter 11 slides (molded by injecting synthetic resin for molding from G).

That is, as described above, the gate part is made so that it does not face within the plane of the sliding member region 13 formed thinly, and the synthetic resin for molding is made to flow out toward the sliding member region 13. A gate portion (G,) facing the inner circumferential side of the opening 9.10 is provided, and this gate portion (G,)
The upper and lower halves 1.2 are molded by injecting a more durable synthetic resin.

Then, by the method of the present invention, upper and lower halves 1. As shown in FIG.
2 and a movable template 33. Then, in the cavity 31, a sprue 34 for resin injection provided on the fixed side template 32 is molded via a runner part 35, and a portion near each corner in the plane part fJkA of the upper and lower halves 1.2 is formed. The upper and lower halves L and 2 are formed by being bored and molded from the first gate part 36 facing the corresponding position and the identification side template 32 side to the VI side template 33 side via the runner part 37. A second gate portion 38 is exposed at a position corresponding to the inner peripheral side surface of the pickup opening 9°10.
Synthetic resin for molding is injected through. That is, the first gate part 36 is provided near each corner in the plane area of the upper and lower halves 1 and 2 to be molded, which is a position facing the plane of the cavity 31, and is configured as a bin point gate. . Also, on the 3rd day of the second gate section,
Since it faces the inner circumferential side of the pickup opening 9°lO of the upper and lower halves 1.2 formed by punching the movable template 33, it is configured as a submarine gate.

As mentioned above, the upper and lower halves 1.2 are connected to these halves 1.2.
In addition to the gate part (CP) facing the vicinity of each corner in the flat part area of 2, the sliding part area 13 extends from the gate part (G,) facing the inner circumferential side of the pink-up opening 9.10.
Since the molding is performed by injecting the synthetic resin for molding toward the sliding area 13, the resin can be smoothly injected without leaving injection marks of the molding resin within the plane of the thin sliding area portion 13.

In the above-described embodiment, the second gate portion 38 configured as a submarine gate is located at a position facing the inner circumferential side of the pink-up opening 9.10 and near the front end side of the upper and lower halves 1.2. However, if the resin can be injected toward the sliding page area 13 without facing the plane of the sliding area 13, the pink-up openings 9 and 10 may be The second gate portion 38 may be provided at any position facing the inner circumferential side surface.
It may be provided at a position facing the inner circumferential side surface of the sliding area 13, and the resin may be injected toward the sliding area 13.

Further, in the above-described embodiment, the method of the present invention was explained using an example in which the optical disc 5 is housed and applied to a disc cartridge, but the method of the present invention is not limited to such a disc cartridge, but is applicable to a disc-shaped It can be widely applied to cartridges containing a recording medium, a shutter is attached to the cartridge containing the recording medium, and the area on which the shutter slides is thinly molded, and the same effects as the disk cartridge can be obtained. It is something that can be done.

H0 Effects of the Invention As described above, the present invention provides a method for manufacturing a cartridge in which a recording medium such as an optical disk or a magneto-optical disk is housed. A gate portion for resin injection is provided in the gate portion, and molding resin is injected from this gate portion toward the sliding wI region to mold the cartridge, so that the sliding region becomes thin. Smooth resin injection is guaranteed without leaving molding resin injection marks within the surface. Then, the cartridge can be molded with high precision without causing deformation or sink marks during molding, and in particular, the cartridge can be molded without causing deformation or sink marks in the sliding area where the shutter slides. It is possible to easily manufacture a cartridge that can ensure smooth opening and closing of the cartridge.

Furthermore, since the present invention can be molded without providing a gate portion facing into the surface of the sliding region, the cartridge can be molded without leaving injection marks of the molding resin within the surface of the sliding region. There is no harm to it.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the position of the gate portion when upper and lower halves are manufactured by the method of the present invention, and FIG. 2 is a side sectional view schematically showing a mold apparatus used in the method of the present invention. FIG. 3 is an exploded perspective view showing an example of a disk cartridge to which the method of the present invention is applied, and FIG. 4 is an overall perspective view thereof. FIG. 5 is a plan view showing the position of the gate portion when the upper and lower halves are manufactured by the conventional method, and FIG. 6 is a side sectional view schematically showing a mold apparatus used in the conventional method. l...Upper half 2...Lower half 4...Cartridge 5...Optical disc 9, lO...Pink amplifier opening 11...Shutter 13...Sliding area portion 31... Cavity 36...First gate part 38...Second gate part Patent applicant Sony Corporation agent Patent attorney Akira Koike (and 2 others) Figure 5 Figure 6

Claims (1)

[Scope of Claims] A recording medium on which a predetermined information signal can be recorded is housed, and an opening is provided to allow at least a portion of the recording medium to face outward, and an opening/closing member for opening and closing this opening is attached. In the method of manufacturing a cartridge for storing a recording medium according to the present invention, a gate portion for resin injection is formed on a side surface of a sliding area portion on which the opening/closing member slides, and the molding resin flows out toward the sliding area portion. 1. A method of manufacturing a cartridge for storing a recording medium, characterized in that a cartridge for storing a recording medium is formed by injecting a molding resin through the gate part.