JP2599210Y2 - Tape cassette - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape cassette such as a video cassette or a digital audio tape (DAT) in which a recording medium, for example, a tape-shaped medium is accommodated in a case.

[0002]

2. Description of the Related Art Generally, an information medium of a video cassette is
It is easily protected from dust and dirt on handling, so it is stored and protected in a synthetic resin case. This case is made of ABS resin (acrylonitrile / butadiene / styrene copolymer resin) or PS resin (polystyrene resin).
An upper case and a lower case made of PC resin (polycarbonate resin) or the like are welded and connected at a welding portion.

[0003]

In a conventional video cassette, a case for storing media as shown in FIG.
Since the welding projections c are protruded from the upper case a and the lower case b respectively, and welding ribs d are provided on the mating surface of the two projections or the mating surface of the outer peripheral wall of the case, and are integrally joined by the welding horn e. When welding, crystalline resin requires strong energy to melt.If the welding rib is long and long, the time required for welding will be long, and it will be difficult to weld due to the relationship between the joining surface and the welding rib. However, there is a tendency that the upper and lower cases are separated due to the torsion of the case and the drop impact when the welding ribs are melt-bonded.Therefore, many welding ribs are required to increase the welding strength. Must be provided. That is, to increase the welding strength, it is necessary to weld a wide area,
The case surface melts and the appearance becomes poor, the commercial value decreases, and there is a problem in reliability. The present invention is intended to eliminate these conventional disadvantages.Welding can be performed with a crystalline resin case or a cassette case of any thickness, the welding strength is strong, and the bonding state of the upper and lower cases is strengthened. An object of the present invention is to provide a safe, highly reliable tape cassette that can withstand torsion and drop impact in a simple and inexpensive form.

[0004]

According to the present invention, there is provided a tape cassette in which a synthetic resin case for accommodating a tape-shaped medium is composed of an upper case 1 and a lower case 2, and the upper and lower cases are integrally connected by a connecting portion. one case either through a partition wall 4 ₃ a hollow recess 4 ₁ and the insertion recess 4 ₂ and the tubular projection 4 with a, also the other of, is inserted into the insertion concave portion 4 ₂ of the tubular projection 4 while projecting a columnar boss 3 and a support rib 16 for supporting the abutment surface 6 ₃ of the fitting rib 16 ₁ and the cylindrical projections 4, the columnar boss 3 into the insertion concave portion 4 ₂ of the tubular projection 4 abutment surfaces 6 ₂ received in the cylindrical projection 4 of abutment surface 6 ₃ support ribs 16 of the fitting ribs 16 ₁ by inserting the cylindrical protrusion 4 of
Welding surface 6 of the columnar boss 3 and _1, the gap S is formed between the 6, welding horn 8 from the hollow cavity 4 ₁ of insertion convex portion 18
Crowded difference, a tape cassette being characterized in that said both welding surfaces 6,6 ₁ penetrates the septum 4 ₃ integrated by spot welding.

[0005]

When the upper and lower cases 1 and 2 are joined together to integrate the upper and lower cases by welding with a welding horn, one of the cases, for example, the columnar boss 3 protruding from the upper case 1 and the lower case 2 protruding from the lower case 2. abut a hollow cylindrical protrusion 4 that is, a gap S is formed between the welding surface by support ribs 16, the horn 8 with insertion convex portion 18 is inserted into the hollow portion 4 ₁ of the hollow cylindrical projection 4 , by spot welding both welding surfaces of the columnar boss 3 and a hollow cylindrical projection 4 penetrating through the partition wall 4 ₃ intended to integrally linked by intermolecular bonds, to strengthen the combined state, the front and rear of the case, the left and right lateral The tape cassette is highly resistant to shearing force, improves the weldability, and reduces the vibration energy required for welding, so that a highly reliable tape cassette can be obtained.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 to 5. The case using an amorphous resin such as polystyrene or a crystalline resin such as polypropylene resin, polyethylene resin or polyamide resin is an upper case. consists of one and a lower case 2 which, for a structure for accommodating a tape-like medium by welding the upper and lower cases, either one of the upper and lower cases, for example, a hollow recess 4 ₁ to the lower case 2 via the partition wall 4 ₃ a tubular projection 4 having an insertion recess 4 _2, opposite the tubular projection 4 on the outer periphery of the fitting ribs 16 ₁ and the support rib 16 which is inserted into the insertion concave portion 4 ₂ in the case 1 above the other while projecting a columnar boss 3 having, a welding surface 6, 6 ₁ and the upper end surface and the tubular projections 4 of the partition walls 4 ₃ the lower end surface of the flat surface of the boss 3, a hollow recess of the cylindrical protrusion 4 4 ₁ welding horn 8 with insertion convex portion 18 from Inclusive, the partition walls 4 ₃ bonded intermolecular the SL both welding surfaces 6,6 ₁ penetrates the integrated spot welding unit 9 is for a tape cassette.

[0007] The columnar boss 3, a plurality of support ribs 16 radially on the outer periphery, a distal end side of the support ribs 16 to form a stepped portion and the contact surface 6 _2, followed by fitting the ribs 16 ₁ did. Fitted to the fitting rib 16 ₁ to the tubular projection 4 insertion recess 4 ₂ formed, the supporting rib receiving surface 6 ₃ of the tubular projection 4 is supported by the abutment surface 6 _{and second} support ribs 16, the welding surface A gap S is formed between 6, 6 ₁ . The gap S serves as a weld pool during spot welding. For this reason, a floating phenomenon does not occur after welding, and the form is effective for preventing sink marks. Fitting rib 16 ₁ to position acts on the cylindrical protrusion 4, and never shift the upper and lower cases occurs. Furthermore, for ensuring strength and stability during spot welding, it is preferable to equal or more with respect to the welding area of the contact surface 6 the welding surface 6 a total area of ₂ of the support ribs 16.

On the welding surface 6 side, a concave portion is formed by an insertion convex portion 18 of the welding horn 8 and is integrated by spot welding. The cylindrical projection 4 is formed by a parting surface of the upper and lower cases 1 and 2. 5 and has a welding surface 6 ₁ made different,
It is effective because welding by a horn is easy and the welding time and energy can be reduced.

[0009] The cylindrical projection 4 with the welding surface _61, a columnar boss 3 with welding surface 6 facing the welding surface ₆₁ of the tubular projection 4, a partition for partitioning the storage area 10 of the tape 11 Utilizing the projections disposed opposite the case corners between the rib 7 and the case outer wall, the positions of the four corners and the center of the case other than the medium storage area, which are the same as the conventional tapping positions, are selected. However, in this case, the overall balance and rigidity of the cassette half are good, and there is no problem in appearance due to protrusion after welding.

[0010] Incidentally, examples of the hollow tubular projections 4, the partition walls 4 ₃ between the hollow recess 4 ₁ and the insertion recess 4 ₂ are the lower than the case surface, the welding surface ₆₁ is from the case parting plane 5 located entered position within casing side, and a support rib 16 projecting from the plurality radially outer periphery of the boss 3,溶隔reservoir during spot welding so as to be maintained a gap S between the welding surface 6,6 ₁ It is considered to be easy to spot weld. A tape 11 is wound around a pair of rotatable tape reels 12 and 12 in a case composed of an upper case 1 and a lower case 2, and a front lid 13 for opening and closing a case opening is rotated. It can be freely deployed and used as a tape cassette.

In this embodiment, the concave portion 4 ₂ of the hollow cylindrical body 4 is used.
Within, thereby improving the accuracy and workability of the welding process giving positioning function by fitting the fitting rib 16 ₁ of columnar bosses 3.

FIG. 5 is an enlarged sectional view of the welded portion shown in FIG. 4, in which a concave portion is formed on the welded surface 6 by the insertion convex portion 18 of the horn 8 so that intermolecular bonding is strengthened.

[0013]

According to the present invention, in a tape cassette in which a synthetic resin case for accommodating a tape-shaped medium is composed of an upper case and a lower case, and the upper and lower cases are integrally connected by a connecting portion, one of the upper and lower cases is provided. A cylindrical projection having a hollow concave portion and an insertion concave portion via a partition wall, and, on the other side, a contact surface of the fitting rib and the cylindrical projection on the outer periphery inserted into the insertion concave portion of the cylindrical projection. A welding horn having a columnar boss provided with a support rib, a welding surface having a flat contact surface between the insertion recess of the cylindrical projection and the boss, and an insertion projection from the hollow recess. And the two welding surfaces are integrated by spot welding through the partition wall 43, so that welding can be performed even with a crystalline resin case or with a cassette having any thickness, and the connection state of the upper and lower cases is firmly secured. Able and accurate Joint work and welding can be performed in a narrow welding area, simplifying the installation work, withstanding torsion and drop impact on the case, and having high welding strength, which adversely affects the characteristics of the recording / reproducing medium. It can be used safely without giving any effect, and has practical effects such as good appearance, high quality, remarkable improvement in assemblability and reliability, and enhancement of commercial value.

[Brief description of the drawings]

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

FIG. 2 is an enlarged perspective view of a part of the upper and lower cases of FIG. 1 in a separated state.

3 is a longitudinal sectional view of the example of FIG. 2 before welding.

FIG. 4 is a longitudinal sectional view after welding of the example of FIG. 2;

FIG. 5 is an enlarged vertical sectional view of the example of FIG. 4;

FIG. 6 is an enlarged vertical cross-sectional explanatory view of a conventional case connection mode.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G11B 23/087 505

Claims (3)

(57) [Scope of request for utility model registration] 1. A tape cassette in which a synthetic resin case for accommodating a tape-shaped medium is composed of an upper case 1 and a lower case 2, and the upper and lower cases are integrally connected by a connecting portion. ₃ through the hollow recess 41
And a tubular projection 4 having an insertion recess 4 _2, also the other of the contact surfaces 6 ₃ of the fitting rib 16 ₁ and the cylindrical projections 4 which is inserted into the insertion concave portion 4 ₂ of the tubular projection 4 Support rib 1 for supporting
While projecting a columnar boss 3 and a 6, the fitting rib 16 ₁ of the columnar boss 3 into the insertion concave portion 4 ₂ of the tubular projection 4
The abutment surface 6 ₃ of the cylindrical projection 4 the gap S is formed between the welding surface _61, 6 of the contact surface 6 ₂ received in the cylindrical projection 4 and the columnar boss 3 of the supporting ribs 16 by inserting, the crowded difference welding horn 8 with hollow recess 4 ₁ from insertion convex portion 18, the tape being characterized in that penetrates the septum 4 ₃ integrated the two welding surfaces 6,6 ₁ spot welding cassette. Wherein said the area of the welding surface 6 of the columnar boss 3, wherein the support tape cassette according to claim 1, wherein the total area of the contact surface 6 ₂ are the same or more ribs 16. 3. The support rib 16 and the fitting rib 16 ₁
The tape cassette according to claim 1, wherein the tape cassette is radially protruded from an outer peripheral surface of the columnar boss 3.