JP3013199U - Disk cartridge and its molding die - Google Patents

Abstract

(57) [Summary] [Purpose] The design appearance of the case in the disc cartridge is improved, the shutter operation is smoothed to prevent the case from being scraped or damaged, and the necessary plate thickness can be set to prevent the case from deforming. To prevent. A case is formed by integrally molding an opaque resin and a transparent or translucent resin, and the shutter sliding area 5
The transparent window portion 17 has a case portion facing at least the disk-shaped medium 10 and including at least a part 6 and the other portion 7 so that the case has a peculiarity without being monotonically designed. The appearance quality can be improved, and the strength of the opaque part and the transparent part of the case where the different resin is joined does not decrease. There is no molding defect and the case is prevented from deforming due to external force, resulting in a disc-shaped medium failure. In addition, the sliding movable molds for the parts made of transparent resin are configured so that the sliding amounts are different, so that the parts made of transparent resin have the necessary plate thickness for the case. Since it can be set, a highly reliable and reliable disc cartridge case can be efficiently produced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a disc cartridge in which a disc-shaped medium, in particular, an optical disc, a magneto-optical disc, etc. are rotatably accommodated in a case, and a die for molding a case of the disc cartridge.

[0002]

[Prior art]

 Generally, an information medium, for example, a disk medium such as a magnetic disk, an optical disk or a magneto-optical disk is used as a disk cartridge housed in a case. Up to now, the case of the disk cartridge has been molded using only one type of transparent or opaque resin. As a cassette case for other media, for example, in a case of an audio cassette, a transparent resin is integrally molded in a portion including an opaque resin and a window portion which form the outside, and a head insertion hole and a drive provided in the case are provided. It is known to include a shutter that opens and closes an opening such as a shaft insertion hole.

[0003]

[Problems to be solved by the device]

 Conventional disc cartridge cases use only a single resin, so when opaque resin is used, the design is monotonous, and even if the manufacturer is different, the shape is similar and it is difficult for the user to distinguish. In addition, when using a transparent resin, there are few types of transparent resin, so it is not possible to select the most suitable resin for the application.Because the entire surface is transparent, the internal structure is also visible from the table, so the appearance There is a problem in that the design will be focused on, the production will be complicated and the cost will be high. In addition, in the case of a tape cassette in which an opaque resin and a transparent resin are integrally molded in an audio cassette, there is no shutter and the plate thickness is about 1.8 mm, so the boundary between the opaque resin and the transparent resin is Since the part can be provided with a sufficient joint portion, there is no problem since it can be constituted by a single sliding movable mold. However, if the disk cartridge case, which has a lower sliding part where the shutter slides, is composed of a single sliding movable mold, the thickness of the opaque resin and transparent resin contact part could be the thickest. Even if it is, it is equal to the sliding amount of the movable side die that slides. Since the amount of sliding cannot be larger than the thinnest part of the case, the thickness of the joint will generally be the thickness of the shutter sliding part, and the part that can originally be made thicker will be very thin. As a result, the strength of the part made of transparent resin decreases, and it deforms when the case is pressed from the outside, causing scratches when it contacts the disc inside, which causes problems in recording and playback. However, there is a problem that molding failure occurs because the whole is thin. The present invention is intended to eliminate these conventional drawbacks, and greatly improves the appearance quality of the disc cartridge, which enables smooth operation without scraping the case due to sliding of the shutter, resulting in malfunction. Therefore, the safety is improved and the reliability is improved. Therefore, the sliding movable die for the part made of transparent resin can be manufactured with different sliding amounts. It aims to provide an inexpensive cartridge and its molding die.

[0004]

[Means for Solving the Problems]

 According to the present invention, a disc-shaped medium is rotatably housed in a case having an opening into which a recording / reproducing head or the like can be inserted, and a shutter for opening / closing the opening is provided at a shutter slide lower than the outer surface of the case. A cartridge that is slidably provided in a moving area, wherein the case is integrally molded of an opaque resin and a transparent or semitransparent resin, and includes at least a part of the shutter sliding area. It is a cartridge in which a transparent window portion is formed in a case portion facing the black-shaped medium.

[0005]

[Action]

 The case of a disk cartridge having a shutter that slides in a region lower than the outer surface of the case is integrally molded with an opaque resin forming the main part of the case and a transparent resin forming the transparent window, and the transparent window is The shutter consists of at least a part of the lower sliding area and a part of the other area, and when the shutter slides, the movement of the shutter is smooth and the abrasion phenomenon does not occur. It is used with significantly improved reliability, and it is possible to give uniqueness without being monotonous in terms of design and improve the appearance quality, and also for the joint part of different resin between the opaque part and the transparent part of the case. The strength does not decrease, molding defects do not occur, the case deformation due to external force is prevented, and the disk medium is not damaged. By configuring the sliding movable molds so that they have different sliding amounts, it is possible to set the plate thickness required for the case even in the parts made of transparent resin, so there is sufficient strength and reliability. Highly efficient disk cartridge case can be produced.

[0006]

【Example】

 An embodiment of the present invention will be described with reference to an example of the disk cartridge of FIGS. 1 to 11. A disk-shaped medium 10 as an information medium is rotatably housed in a case composed of an upper case 1 and a lower case 2, and a head is formed. A cartridge in which a case 4 having an opening 3 such as an insertion hole is provided with a shutter 4 having a substantially U-shaped cross section for opening and closing the opening 3 slidably in a shutter sliding area 5 which is one step lower than the outer surface of the case. The upper case 1 of the case is integrally formed of an opaque resin and a transparent or semi-transparent resin, and includes at least a part 6 of the shutter sliding area 5 and a part 7 other than the shutter sliding area 5. The transparent window portion 17 is formed with a case portion facing the disk medium 10.

In this case, in the lower window 5 of the transparent window portion 17 of the case where the shutter 4 slides, the portion 6 made of the transparent resin and the portion 7 made of the transparent resin in the region other than the lower region. Is continuous, and in the transparent window portion 17, the thickness of the one-step lower region where the shutter 4 slides is formed thinner than the region thickness of the transparent window portion other than the low region, and The surface of the part should be lower than the surface of the opaque part.

It should be noted that in a disc cartridge molding die including a fixed side die 8 and a movable side die 9 for integrally forming a case for a disc cartridge with an opaque resin and a transparent or translucent resin, The sliding core that slides with respect to the movable die 9 for forming the transparent portions 6 and 7 made of resin is the first sliding core that corresponds to the portion 5 in the region where the shutter 4 slides. 11 and the second sliding core 12 corresponding to the other parts, a mold for a disk cartridge is used, and the plate thickness necessary for the case is also formed in the parts formed of transparent resin with different sliding amounts. You can set.

The upper case 1 is composed of an opaque resin for the main part, the shutter sliding area 5 and the center of the medium, and a transparent resin for the transparent parts 6 and 7 which substantially face the recording surface of the medium. Is integrally molded. Further, the label sticking area 25 is formed in a concave shape by an amount slightly deeper than the label thickness as compared with the other outer surface, and is provided over a part of the portion where the media central portion and the recording surface of the medium are substantially opposed. . The gate 26 made of opaque resin is provided in the shutter sliding area 5, and the gate 27 made of transparent resin is provided in the transparent portion 7 substantially facing the recording surface of the medium and not in the label attaching area 25. Around the arc-shaped region including the transparent resin gate 27, a die abutment portion 28 is provided to prevent the resin from flowing to a portion formed by the transparent resin when the opaque resin is injection-molded. There is a step. The nesting line 30 of the mold gate bush 29 including the bush 19 and the transparent resin gate 27 is arranged in accordance with the step portion. Further, the transparent portion formed of the transparent resin includes a part of the shutter sliding area 5, and the other portions formed of the transparent resin have a continuous shape. This is because the continuous shape has an advantage that the gate for injecting the resin can be provided at one place.

In the case of the disk cartridge of the embodiment, the plate thickness of the main part is about 1 mm, and the plate thickness of the shutter sliding area 5 is about 0.65 mm. In addition, the thickness of the label sticking part which is a part of the main part is about 0.8 mm. Therefore, the sliding movable-side die of the portion formed of the transparent resin is divided into two, and the sliding movable-side die 9 of the main portion and the portion forming the label attaching area 25 and the shutter sliding area 5 are divided. The sliding core 11 is formed. The sliding movable die 9 has a sliding amount of about 0.8 mm, and the sliding core 11 has a sliding amount of about 0.65 mm. In the main surface portion, it is preferable that the outer thickness of the movable mold 9 and the label attaching area 25 are reduced by 0.2 mm so that the plate thickness becomes about 1 mm. The same shape can be applied to the lower case 2. In that case, it is desirable that the shape of the portion formed of the transparent resin is substantially the same as that of the upper case 1 in order to improve the moldability.

In the figure, 20 is a disk clamping plate, 21 is a fitting hole, 22 is an erasure prevention plug, 23 is a shutter lock, 24 is a medium storage section, and 25 is a label area.

Note that the shutter 4 is a metal or synthetic resin shutter, and a reinforcing portion that corresponds to or fits into a concave portion formed on the case side with a sliding guide protruding inward from the case side surface. It is considered to increase the strength of the shutter and improve the reliability.

[0013]

[Effect of device]

 According to the present invention, a disc-shaped medium is rotatably housed in a case having an opening into which a recording / reproducing head or the like can be inserted, and a shutter for opening / closing the opening is provided at a shutter slide lower than the outer surface of the case. A cartridge that is slidably provided in a moving area, wherein the case is integrally molded of an opaque resin and a transparent or semitransparent resin, and includes at least a part of the shutter sliding area. By forming the case part facing the medium in the transparent window part, the appearance quality of the disc cartridge is significantly improved, the rainbow pattern of the disc medium can be seen through, and the aesthetic feeling is good, and within the shutter sliding area. Since there is a shutter in the shutter, the movement of the shutter is smooth, and the shutter can be opened and closed safely without causing the shutter to malfunction, Since there are few occurrences of case damage and shavings such as rubbing or scraping of the case when opening and closing, it is possible to significantly improve reliability without disturbing recording and reproduction such as dropout, and to improve the reliability of the external surface of the case. A case of a disk cartridge having a shutter that slides in a lower region is integrally molded with an opaque resin that forms the main part of the case and a transparent resin that forms a transparent window part. It is at least a part of the lower sliding area and a part of the other area. It improves the quality and durability, and the sliding movable side metal for the part made of transparent resin. By configuring the molds so that the amount of sliding is different, it is possible to set the plate thickness required for the case even in the part formed of transparent resin, so that the mold with sufficient strength Also manufactured by molding die that can be produced rather than by efficiency the case of high sexual disk cartridge there is a practical effect, such as it is easy, inexpensive.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention in a separated state.

FIG. 2 is a plan view of the case of the example of FIG. 1, where (a) shows an upper case and (b) shows a lower case.

FIG. 3 is a plan view of a separated state of a molded portion of a case,
(A) shows an upper case and (b) shows a lower case.

FIG. 4 is an enlarged vertical sectional view taken along the line AA of FIG.

5 is a vertical cross-sectional view at the time of forming a gate portion in the example of FIG.

FIG. 6 is an enlarged vertical sectional view taken along line BB of FIG.

7 is a vertical cross-sectional view at the time of molding of FIG.

8 is an enlarged vertical cross-sectional view of the bush portion of the example of FIG.
(A) shows a mold retreat position, (b) shows a mold advance position.

9 is an enlarged vertical sectional view taken along the line CC of the example of FIG.

10A and 10B are vertical cross-sectional views of the example of FIG. 9 at the time of molding, in which FIG.

11 is an enlarged cutaway perspective view taken along the line DD of the example of FIG.

[Explanation of symbols]

 1 Upper Case 2 Lower Case 3 Opening 4 Shutter 5 Shutter Sliding Area 6 Transparent Part 7 Transparent Part 8 Fixed Side Mold 9 Movable Side Mold 10 Disk Medium 11 First Sliding Core 12 Second Sliding Core 19 Bush 20 Clamping plate 25 Labeling area 26 Gate 27 Gate

Claims (4)

[Scope of utility model registration request] 1. A shutter for rotatably accommodating a disk-shaped medium inside a case having an opening into which a recording / reproducing head or the like can be inserted and for opening and closing the opening is lower than an outer surface of the case. A cartridge provided slidably in a sliding area, wherein the case is integrally molded of an opaque resin and a transparent or semi-transparent resin, and includes at least a part of the shutter sliding area. A disk cartridge characterized in that a case portion facing to is formed in a transparent window portion. 2. A portion of the transparent window of the case formed of the transparent resin in a lower region where the shutter slides and a portion of the transparent window in the other region formed of the transparent resin are continuous. A disk cartridge according to claim 1. 3. The disk cartridge according to claim 1, wherein a surface of the transparent portion of the shutter is lower than a surface of the opaque portion in a sliding lower region. 4. A disk cartridge molding die comprising a fixed mold and a movable mold for integrally molding a disk cartridge case with an opaque resin and a transparent or translucent resin, and the mold is made of transparent resin. The sliding core that slides with respect to the movable-side die for forming the portion to be formed is the first sliding core that corresponds to the portion of the region where the shutter slides and the second sliding core that corresponds to the other portions. A molding die for a disc cartridge, which comprises a sliding core of