JP2684398B2 - Tape cartridge - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a tape cartridge in which the material of the main body case is improved, and the main body case is composed (bending strength).
And shock resistance are secured.

[Conventional technology]

A conventional example of a tape cartridge to which the present invention is applied will be described with reference to the accompanying drawings. The main body case 1 is generally composed of upper and lower cases 1a and 1b which are joined together in a lid-fitting manner, and upper and lower cases 1a and 1b. Has a basic shape including a main surface wall 8 having a planar expansion and a peripheral side wall 9 continuous with the outer peripheral edge of the main surface wall 8.

Therefore, it is desired to improve the visibility of the tape winding amount with respect to each hub 5 inside. From this point of view, the transparent window portion 7 for visually recognizing the tape winding amount to be provided on the principal surface wall 8 is set large, and the principal surface wall 8 is formed by, for example, a two-color injection molding method.
It is known that the flat portion 10 excluding the transparent window portion 7 and the peripheral side wall 9 are primarily molded with an opaque synthetic resin such as ABS resin, and then the transparent window portion 7 is secondarily molded with a transparent synthetic resin.

Further, it is also known to integrally mold the entire case including the main surface wall 8 and the peripheral side wall 9 with transparent synthetic resin.

[Problems to be solved by the invention]

In such a conventional form, since the area of the transparent wall portion is large,
Since the transparent wall portion carries the rigidity (bending strength) required for the entire case, it is desired to mold the transparent wall portion with, for example, GPPS resin, which has excellent rigidity and heat resistance.

However, when the entire case is formed as an integrally molded product of transparent synthetic resin, the impact resistance is generally lacking. Therefore, there is a disadvantage that the peripheral side wall 9 that is susceptible to a drop impact and particularly the connecting corner portion 11 between this and the main surface wall 8 are easily damaged.

On the other hand, when the flat surface portion 10 of the main surface wall 8 excluding the transparent window portion 7, the connecting corner portion 11 and the peripheral side wall 9 are formed of a soft opaque synthetic resin, the impact resistance is excellent, but the bending strength tends to be poor. However, no matter how large the transparent window 7 is set, the main body case 1 is likely to be warped or warped as shown by phantom lines in FIGS. 5 (a) and 5 (b). Tends to impede stable driving.

The present invention has been proposed in order to eliminate such a conventional problem, and an object thereof is to obtain a tape cartridge which secures impact resistance at a problematic portion of the main body case and also secures rigidity of the entire case. is there.

[Means for solving the problem]

That is, the main body case 1 of the present invention is composed of the main surface wall 8 including the transparent window portion 7 and the peripheral side wall 9 bent and connected to the outer peripheral edge of the main surface wall 8, and at least the main surface wall 8 and the peripheral side wall 9 are formed. The intersecting connecting corner portion 11 is formed of a soft opaque synthetic resin, and has a transparent window portion 7 and an inner wall portion 9b of the peripheral side wall 9 and / or
Alternatively, the outer wall portion 9a is integrally formed of a hard transparent synthetic resin of the same material.

As the soft opaque synthetic resin in the present invention, for example, a HIPS resin containing butadiene as a component is preferably used, and an ABS resin and a MIPS resin (a mixture of a HIPS resin and a GPPS resin) are also mentioned. GPPS resin is preferable as the hard transparent synthetic resin, and AS resin and the like are also available.

[Action]

By a so-called two-color injection molding method, for example, at least the connecting corner portion 11 where the main surface wall 8 and the peripheral side wall 9 intersect is primarily molded with a soft opaque synthetic resin. Next, the inner wall portion of the peripheral side wall 9
9b and / or the outer wall portion 9a and the transparent window portion 7 are simultaneously secondary-molded with a hard transparent synthetic resin to obtain a main body case.

〔The invention's effect〕

According to the present invention, the main surface wall 8 and the side wall 9 of the main body case 1 are
Since the connecting corner portion 11 intersecting with is formed of a soft opaque synthetic resin, at least the impact resistance of the connecting corner portion 11, which is a particular problem, can be ensured, and the damage due to the drop impact of the relevant portion can be well prevented.

Moreover, the rigidity such as the bending strength of the entire case which is difficult to obtain only with the opaque synthetic resin is well compensated by integrally molding the inner wall portion 9b and / or the outer wall portion 9a of the peripheral side wall 9 with the transparent window portion 7 with a hard transparent synthetic resin. be able to.

Further, since the inner wall portion 9b and / or the outer wall portion 9a of the peripheral side wall 9 are made of the same material as the transparent window portion 7 and integrally molded,
For example, after the opaque wall portion is primarily molded by the two-color injection molding method, the transparent wall portion can be secondary molded, and the main body case 1 can be easily molded.

[First Embodiment] FIGS. 1 and 2 show a first embodiment of a tape cartridge according to the present invention.

The body case 1 of this is the upper and lower cases 1a and 1b made of synthetic resin.
Are butt-joined with each other and integrally coupled with each other by screws 2 or the like, and the drive shaft insertion hole 3 is formed in a vertically penetrating shape at the left and right of the central portion of the main body case 1.
・ Hubs 5 having 3 and on which the tape 4 is wound on the left and right sides of the main body case 1 are positioned rotatably on the respective drive shaft insertion holes 3 3, and the tape 4 is placed from one hub 5 It is fed to the front of the case and wound around the other hub 5.

The upper case 1a and the lower case 1b each have a flat plate-shaped main surface wall 8 having a vast transparent window portion 7 including left and right drive shaft insertion holes 3 in the central portion, and a rear edge and left and right sides of the main surface wall 8. Consists of a peripheral side wall 9 that is bent from the edge at a right angle and is continuous,
The upper and lower peripheral side walls 9 are directly abutted with each other. Reference numeral 10 denotes a flat portion of the outer periphery of the main surface wall 8 excluding the transparent window portion 7, and 11 denotes a connecting corner portion where the main surface wall 8 and the peripheral side wall 9 intersect.

In the upper and lower cases 1a and 1b, as shown in FIG. 2, the flat surface portion 10 of the main surface wall 8 excluding the transparent window portion 7, the connecting corner portion 11 and the outer wall portion 9a of the peripheral side wall 9 are made of butadiene containing excellent impact resistance. Opaque synthetic resin such as HIPS resin, MIPS
Resin, ABS resin, etc. are integrally molded, and the transparent window portion 7 and the inner wall portion 9b of the peripheral side wall 9 are integrally made of a hard transparent synthetic resin having excellent transparency and heat resistance, for example, GPPS resin, PS resin, AS resin, etc. It is molded.

The peripheral side wall 9 has an outer wall portion 7a and an inner wall portion 7b in the thickness direction.
It is divided into two parts. That is, the upper case 1a and the lower case 1b are made of the above-mentioned opaque wall portion (10 ・ 11
・ 9a) is first molded with an opaque synthetic resin such as HIPS, and then the transparent wall part (7, 9b) is secondarily molded with a transparent synthetic resin such as GPPS resin to form an integrally molded product.

In this case, the primary molding material and the secondary molding material are required to have compatibility. Therefore, when HIPS resin or MIPS resin (a mixture of HIPS resin and GPPS resin) is used as the primary molding material, GPPS resin is used as the secondary molding material. When ABS resin is used as the primary molding material, PS resin or AS resin can be used as the secondary molding material.

Particularly, in this embodiment, not only the connecting corner portion 11 between the main surface wall 8 and the peripheral side wall 9 but also the outer wall portion 9a of the peripheral side wall 9 is formed of a material having excellent impact resistance. Even if it is dropped to the bottom, the relevant part is hard to break.

[Second Embodiment] FIG. 3 shows a second embodiment of the present invention, in which the outer wall portion 9a of the peripheral side wall 9 is made of a transparent and rigid resin and the inner wall portion 9b is opaque with excellent impact resistance. Molded with synthetic resin, the other structures were the same as in the first embodiment.

[Third Embodiment] FIG. 4 shows a third embodiment of the present invention, in which the entire peripheral side wall 9 is molded with a transparent synthetic resin such as GPPS resin having excellent rigidity, and the remaining structure is Same as Example 1.

According to the first and second embodiments, the impact resistance of the connection corner portion 11 in question can be ensured, and the mechanical properties of rigidity can be improved, and an excellent design can be obtained. It was

(Another embodiment example)

The main surface wall 8 may be entirely formed with the transparent window portion 7 by leaving the connecting corner portion 11 alone. Plane part 10 of the main surface wall 8
The opaque synthetic resin forming such as may be translucent as exemplified by the MIPS resin. The target tape cartridge may include a wide variety of tape cartridges for video, and the transparent window portion 7 may be present only on the upper case 1a side. It goes without saying that the transparent window portion 7 does not have to have a wide window as in the illustrated example.

[Brief description of the drawings]

FIGS. 1 and 2 show a first embodiment of a tape cartridge according to the present invention. FIG. 1 is a partially cutaway plan view, and FIG. 2 is an enlarged sectional view taken along line II-II in FIG. Is. FIG. 3 is a sectional view showing a second embodiment of the present invention corresponding to FIG. FIG. 4 is a sectional view showing a third embodiment of the present invention corresponding to FIG. FIGS. 5 (a) and 5 (b) are rear views for explaining a defective deformed state of the conventional tape cartridge. 1 ... main body case, 1a ... upper case, 1b ... lower case, 7 ... transparent window part, 8 ... main surface wall, 9 ... peripheral side wall, 9a ... peripheral side wall outer wall part, 9b ... periphery Inner wall part of the side wall, 10 ... Planar part of the main surface wall excluding the transparent window part, 11 ... Connection corner part.

Claims (2)

(57) [Claims] 1. A principal surface wall 8 including a transparent window portion 7, and the principal surface wall 8
In a main body case 1 made of a synthetic resin, which is composed of a peripheral side wall 9 bent and connected to the outer peripheral edge of the peripheral corner, at least a main surface wall 8 and the peripheral side wall 9 intersect with each other.
11 is formed of a soft opaque synthetic resin, and has a transparent window portion 7 and an inner wall portion 9b and / or an outer wall portion 9a of the peripheral side wall 9.
Is a tape cartridge characterized by being integrally molded from a hard transparent synthetic resin of the same material. 2. The tape cartridge according to claim 1, wherein the soft opaque synthetic resin is a resin containing butadiene.