JPH087573Y2 - Tape cassette - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application] The present invention relates to a tape cassette, and more particularly to a cassette half welding structure.

[Outline of device]

The present invention is a compact cassette in which a pair of cassette halves are joined by welding all around, in order to improve the impact resistance strength of the guide protrusions on both sides of the cassette half, the guide protrusions are also welded. It is designed to be welded and joined.

[Conventional technology]

FIG. 3 shows a box shape of an audio compact cassette which is widely used at present, that is, (1) in the figure is a cassette box body, and the cassette box body (1) is a pair of symmetrically formed pairs. A cassette half (upper cover half and lower base half) (2) is united.
(3) is a reel shaft insertion hole, (4) is a capstan insertion hole, and (5) is a positioning hole.

Further, on the left and right side surfaces of the peripheral side wall portion (2a) of the cassette half (2), guide projections (6) are provided in a protruding manner, and the guide projections (6) are arranged on the upper and lower sides as shown in FIG. The cassette halves (2) are combined together to form a complete guide protrusion (7), which guides the tape cassette to a predetermined mounting position when the tape cassette is mounted on the tape recorder. Stipulated.

In such a tape cassette, a welding method has been widely practiced in recent years as a means for uniting the upper and lower cassette halves (2).

This welding method includes point welding and full circumference welding. Point welding locally joins and joins points at a predetermined number of places (for example, four corners) of the cassette half (2). Has a defect that the impact resistance strength of the welded portion is weak in the drop impact test after welding, so that the entire circumference welding is currently the mainstream.

The tape cassette for performing the entire circumference welding is shown in FIGS.
As shown in the figure, the mating surfaces of the cassette halves (2),
That is, a welding rib (8) is provided on the top surface of the peripheral side wall (2a) so as to extend over substantially the entire circumference, and the cassette half (2) and the cassette half (2) are combined by an ultrasonic welding machine. The cassette halves (2) are mounted and united by heat-melting the welding ribs (8).

Thus, the tape cassette formed by joining the pair of cassette halves (2) by welding the entire circumference has a strong bonding strength because it has a bonding portion over substantially the entire circumference.
For example, even if a drop impact is applied, the cassette halves (2) are not separated from each other.

[Problems to be solved by the device]

However, in this conventional tape cassette, since the guide protrusions (6) are simply joined together and not bonded, the impact strength of the guide protrusions (6) is weak. When the guide projection (6) collides with the floor surface during the fall of the object, a crack (crack) C often occurs in the guide projection (6) and its vicinity as shown in FIG. there were.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a tape cassette having a welding structure in which the impact strength of the guide projection is improved and cracks are less likely to occur.

[Means for solving the problem]

In order to achieve the above-mentioned object, the present invention provides a tape cassette in which a pair of cassette halves having guide projections on both side surfaces are welded and joined by welding ribs as welding protrusions provided over substantially the entire circumference. In the above, the guide ribs are also provided with welding ribs as welding protrusions.

[Action]

By providing the welding ribs on the guide protrusions in this way, when the cassette halves are welded together, the guide protrusions are also welded at the same time, which increases the impact resistance strength of the guide protrusions and their vicinity. Even if a drop impact or the like is applied, cracks are less likely to occur.

〔Example〕

In the following, an embodiment of the present invention will be described with reference to FIGS. 1 and 2, parts corresponding to those in the conventional example shown in FIGS. 3 to 7 will be designated by the same reference numerals, and the description thereof will be omitted. To do.

In the tape cassette of the present invention, the guide projection (6) is also welded in order to increase the impact resistance strength of the guide projection (6).

That is, in this example, a welding rib (9) of a predetermined length is provided in parallel with the entire circumference welding rib (8) on the mating surface of the guide projection (6) of the cassette half (2). Therefore, when the cassette halves (2) and the cassette halves (2) are welded by the ultrasonic welding machine, the welding ribs (9) are also heat-melted at the same time, and the guide projections (6) are welded to each other. It

By doing so, the guide protrusions (6) are integrated with each other and the joint strength thereof is improved, so that the impact resistance strength of the guide protrusions (6) and the vicinity thereof is increased, and as a result, the tape is formed. When the cassette is dropped, cracks are less likely to occur in the guide projection (6) and its vicinity.

The present inventors conducted a drop impact test using the tape cassette of the conventional structure and the tape cassette of the present invention, and compared the crack occurrence rates of the guide projections (6). Results were obtained.

As described above, compared with the conventional tape cassette, by implementing the cassette half welding structure according to the present invention, the drop impact strength of the guide projection (6) and its vicinity is improved, and the crack occurrence rate is increased. Can be reduced.

In this embodiment, a welding rib (9) having a predetermined length is provided as the welding projection of the guide projection (6), but the welding projection is not limited to the rib and may be, for example, a cylinder (pin). ) -Shaped welding convex portions may be arranged in parallel.

[Effect of device]

As described above, since the tape cassette of the present invention has the welding structure in which the guide projection of the cassette half is provided with the welding projection, the impact resistance of the guide projection and the vicinity thereof becomes strong, and therefore the tape cassette. It is possible to reduce the crack occurrence rate of the guide projections when the tape is dropped, etc., and it is possible to provide a high-quality tape cassette having excellent durability.

[Brief description of drawings]

FIG. 1 is a plan view of a main part of a cassette half showing an embodiment of the present invention, FIG. 2 is a perspective view of the same, FIG. 3 is a plan view showing a box shape of a compact cassette, and FIG. 4 is its guide. Fig. 5 is a perspective view of the vicinity of a projection portion, Fig. 5 is a plan view of a main part of a cassette half showing a conventional example, Fig. 6 is a perspective view of the same, and Fig. 7 is a description of a state where a crack is formed in a guide projection portion It is a figure. In the figure, (2) is a cassette half, (6) is a protrusion for a guide, (8) is a welding rib as a welding protrusion for welding the entire circumference of the cassette half, and (9) is a protrusion for a guide. It is a welding rib as a welding convex portion.

Claims (1)

[Scope of utility model registration request] 1. A tape cassette in which a pair of substantially symmetrical cassette halves having guide projections on both side surfaces are welded and joined together by welding projections provided over substantially the entire circumference thereof. A tape cassette characterized in that it also has a welding protrusion.