JP2893643B2 - Disk cartridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening for rotatably storing a disk-shaped medium, particularly an optical disk or a magneto-optical disk in a case, and exposing the disk-shaped medium to the outside and an opening for inserting a drive shaft. And a disk cartridge having a shutter for opening and closing at least one of the openings.

[0002]

2. Description of the Related Art Generally, a conventional disk cartridge has an opening for exposing a disk-shaped medium contained therein to the outside. The shutter member is opened when used and is closed when not used. Are slidably provided on the case. In the conventional disk cartridge, the sliding area of the shutter member is generally formed as a substantially flat surface, and a matte finish is formed thereon. Due to this satin finish, the upper and lower plates of the shutter and the shutter sliding surface of the case did not adhere to each other, and the shutter could slide smoothly.

[0003]

However, when the sliding surface of the shutter is made glossy for the purpose of improving the visibility of the internal disk-shaped medium, the upper and lower plates of the shutter and the sliding surface of the shutter of the case are used. However, there is a problem in that the shutters are heavily adhered to each other due to the small surface roughness, and the opening and closing of the shutters become heavy, resulting in poor opening and closing operation.The shutter is made of metal or hard resin or resin containing hard additive. In this case, there is a problem that the glossy surface of the shutter sliding surface is damaged, and when the transparent window portion is used, the original purpose of improving visibility cannot be achieved. The present invention solves these conventional problems, smoothes the opening and closing of the shutter, and prevents damage to the glossy surface even as the shutter sliding surface of the glossy surface, thereby increasing the commercial value and improving the appearance quality. The purpose of the present invention is to provide a reliable disk cartridge.

[0004]

According to the present invention, a case having an opening through which a recording / reproducing head or the like can be inserted is provided.
A cartridge which rotatably stores a disk-shaped medium and slidably includes a shutter having a U-shaped cross section for opening and closing the opening in a shutter sliding area one step lower than the outer surface of the case; Is formed on a glossy surface, and a portion of the glossy surface other than the portion in contact with the front end of the shutter is further formed on a concave flat portion having a step.

[0005]

In a disk cartridge having a shutter that slides in a step lower area on the outer surface of a case, a glossy surface is formed in a shutter sliding area, and a portion of the glossy surface other than a portion in contact with the front end of the shutter is formed in a concave portion having a further step. Since the shutter is formed, the movement of the shutter is smooth, and no damage phenomenon occurs.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the embodiment of the present invention is applied to an upper case will be described. As shown in FIGS. 1 to 4, an upper case 1 having an opening 3 into which a recording / reproducing head or the like can be inserted and a lower case. A disk-shaped medium 10 is rotatably housed in a case made of a material, and a shutter 4 having a U-shaped cross section for opening and closing the opening 3 is slidable in a shutter sliding area 5 one step lower than the outer surface of the case. in the cartridge with the said shutter slide region 5 formed on the glossy surface, is formed on the concave plane portion 5 ₂ with further stepped except portions 5 ₁ which is in contact with the shutter tip of the shiny side.

In this case, the upper case 1 is formed by integrally molding a case main portion 6 made of an opaque resin and a transparent window portion 7 made of a transparent or translucent resin.
The surface is formed with a rough surface. An opaque resin portion and a transparent resin portion having a glossy surface are provided. The glossy surface of the transparent resin other than the portion in contact with the shutter is provided with a step so as to be lowered.

Also, a concave flat label area 25 for sticking a label is provided on the surface of the upper case 1, and at least a part of the label area 25 is formed of an opaque resin so as to be continuous with the main part 6 of the case. The transparent window 7 is formed in a convex flat surface 17 having a step with respect to the plane of the label area 25 at the boundary where the portion is made of a transparent resin and is in contact with the transparent window 7.

Further, the shutter sliding region 5 is formed of an opaque resin portion and a transparent resin portion, and is formed continuously with the opaque resin portion and the transparent resin portion of the label area 25. However, the transparent window portion 7 includes at least a part of the shutter sliding area 5 and a case portion facing the disk-shaped medium 10. In this case, the transparent window 7 formed of a transparent resin is
The disk-shaped medium 10 is formed in an annular shape in an area other than the outermost periphery and the center part, and the label area 25 is formed.
The transparent window portion 7 is formed such that the depth of the concave flat surface and the concave portion 27 of the transparent window portion forming gate portion are substantially the same.

Incidentally, in a disk cartridge molding die composed of a fixed die 8 for integrally molding a case with an opaque resin and a transparent or translucent resin, and a movable die 9, FIGS. The sliding core that slides with respect to the movable mold 9 in the shutter sliding region 5 formed of a transparent resin as described above includes a first sliding core 11 corresponding to the shutter sliding region 5 and other parts. The second sliding core 12 corresponding to the above is used, and the sliding amount is different from each other, so that the thickness required for the case can be set at the place formed of the transparent resin.

The upper case 1 comprises a case main part 6, a shutter sliding area 5 and a medium central part made of an opaque resin.
Transparent window 7 that is made of transparent resin and almost faces the recording surface of the media
And both resins are integrally molded. In addition, the label area 25 for label attachment is concavely formed by an amount slightly deeper than the thickness of the label as compared with the other outer surfaces, and the central portion of the media and the recording surface of the media are provided so as to extend over a part of a portion substantially opposed to the media. is there. Then, the gate recess 2 of the opaque resin
6 is provided to the shutter sliding area 5, a gate recess 27 formed from the gate portion 27 ₁ of the transparent resin is convex plane of the transparent window portion 7 substantially facing the recording surface of the medium 17
And is provided at a place other than the label area 25. In addition, around the arc-shaped region including the gate recess 27 of the transparent resin, a die abutment for preventing the resin from flowing into the portion formed of the transparent resin when the opaque resin is injection-molded. There is a step due to the portion 28. To fit the stepped portion, so as to place the nest line 30 of the gate bush 29 of the mold including a gate portion 27 ₁ of the bush 19 and the transparent resin. Also, in the transparent part formed of transparent resin,
A part of the shutter sliding area 5 is included, and the other part formed of the transparent resin has a continuous shape. This is because the continuous shape has an advantage that the gate into which the resin is injected can be provided at one place.

[0012] higher than the shutter sliding section formed with the tip of a portion of the shutter of the shutter slide region 5 formed in the transparent resin, the portion 5 ₁ in contact with other transparent resin. This height is set to a small height, for example, 0. 0, so that the shutter sliding area formed of another transparent resin does not contact the shutter, and a gap is minimized.
It is better to be 1 mm or less. In this embodiment, the periphery of the opening is formed of an opaque resin, and this portion is subjected to satin finish. Therefore, the portion formed of the opaque resin has a uniform height. Further, among the portions formed of the transparent resin, the portion formed of the opaque resin has the same height in the portion that is one step higher than the portion in contact with the tip of the shutter and around the opening. In this embodiment, the case is applied to a case integrally formed of an opaque first resin and a transparent second resin. For example, the case is formed of one kind of resin such as a transparent or translucent resin. Also applicable to cases.

In the case of the disk cartridge according to the embodiment, the thickness of the main portion is about 1 mm, and the shutter sliding area 5 is provided.
Is about 0.65 mm. In addition, case main part 6
Is about 0.8mm in the label area 25 in a part of
It is. Therefore, the sliding movable mold at the part formed of the transparent resin is divided into two parts, and the sliding movable mold 9 at the part forming the case main part 6 and the label area 25 and the shutter sliding area 5 are formed. To be the sliding core 11. The sliding amount of the movable mold 9 that slides is about 0.8 mm, and the sliding amount of the sliding core 11 is about 0.65 mm. In addition, the main surface portion is reduced by 0.2 mm except for the outer peripheral portion of the movable mold 9 that slides and the label area 25 to have a thickness of about 1 m.
It is good to be m. Further, in the label area 25, at a portion corresponding to the center of the disc,
By forming it with an opaque resin [Fig. 7 (a)], or by forming a two-layer form of an opaque resin and a transparent resin [Fig. 7 (b)], giving specificity without being monotonous in design. To improve the appearance quality, and also to prevent the case deformation due to external force without molding failure, without reducing the strength at the joint of different resin between the opaque part and the transparent part of the case,
No failures occur in the disk medium. Further, the same shape can be applied to the lower case 2. In that case, the shape of the part formed of the transparent resin
It is desirable that the shape be substantially the same as that described above in order to improve moldability.

In the figure, reference numeral 20 denotes 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 portion, 25 is a label area, and 26 and 27 are gate recesses. is there.

The shutter 4 is a metal or synthetic resin shutter. A sliding guide protruding from the side of the case into the interior thereof has a reinforcing portion corresponding to or fitted to a recess formed in the case. In consideration of this, it is considered that the strength of the shutter is increased and the reliability is improved.

[0016]

According to the present invention, a disk-shaped medium is rotatably accommodated in a case having an opening into which a recording / reproducing head or the like can be inserted, and a U-shaped shutter for opening and closing the opening. In a shutter sliding area one step lower than the outer surface of the case, the shutter sliding area is formed on a glossy surface, and the portion of the glossy surface other than the portion in contact with the shutter tip is further concaved with a step. Due to the configuration formed on the flat portion, the opening and closing of the shutter is lightened, and there is no occurrence of a malfunction in opening and closing. Even if the shutter is made of a metal or a hard resin or a resin containing a hard additive, a glossy surface is obtained. The objective of the present invention is to improve the visibility without damaging the sliding surface of the shutter, and a disk cartridge with high reliability and excellent appearance quality and operability can be obtained.

[Brief description of the drawings]

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

FIGS. 2A and 2B are plan views of the case of the example of FIG. 1, wherein FIG. 2A shows an upper case and FIG.

FIG. 3 is a plan view of the case of FIG. 2 in a separated state;
(A) shows an upper case and (b) shows a lower case.

4A is an enlarged vertical sectional view taken along line CC of FIG. 2A, FIG. 4B is a retracted position of a mold at the time of molding, and FIG.
Indicates a mold forward position.

5A is an enlarged longitudinal sectional view taken along line BB of FIG. 2A, FIG. 5B is a mold retreat position at the time of molding, and FIG.
Indicates a mold forward position.

6A is an enlarged longitudinal sectional view taken along line AA of FIG. 2A, and FIG. 6B is a partial longitudinal sectional view at the time of molding.

7A is an enlarged partially cutaway perspective view taken along line DD of FIG. 2A, and FIG. 7B shows another embodiment of the same portion as FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Upper case 2 Lower case 3 Opening 4 Shutter 5 Shutter sliding area 5 ₁ Shutter tip contact part 5 ₂ Concave flat part 6 Case main part 7 Transparent window 8 Fixed side mold 9 Movable side mold 10 Disk-shaped medium 11 First sliding core 12 Second sliding core 19 Bush 20 Clamping plate 25 Label area 26 Gate recess 27 Gate recess

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G11B 23/03

Claims (2)

(57) [Claims] 1. A housing having an opening through which a recording / reproducing head or the like can be inserted, a disk-shaped medium is rotatably housed, and a U-shaped shutter for opening and closing the opening is provided in the case. In a cartridge slidably provided in a shutter sliding region one step lower than the outer surface, the shutter sliding region is formed on a glossy surface, and a portion other than the portion of the glossy surface contacting the shutter tip is further formed on a concave flat portion having a step. A disk cartridge characterized by the following. 2. An opaque resin for an upper case of the case,
The shutter sliding area is formed of an opaque resin portion having a rough surface and a transparent resin portion having a glossy surface. 2. The disk cartridge according to claim 1, wherein the glossy surface of the transparent resin other than the portion in contact with the shutter is lowered by providing a step.