JPH0424543Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a tape cassette suitable for use, for example, in a video tape recorder.

(Prior Art) A tape cassette with a conventional structure has upper and lower halves 1, as shown in the overall perspective view in FIG.
A and 1b form a cassette casing 1, and the front surface of the cassette casing 1 is covered with a guard panel 2 rotatably supported.

This guard panel 2 includes an upper plate part 2a and a front plate part 2b.
and a side plate portion 2c, and when the cassette is not in use, it is held in the closed state by a locking mechanism (not shown) provided within the cassette housing 1.

Figure 6 shows a cassette case 1 as shown in Figure 5.
2 is a rear perspective view mainly showing the screw tightening positions for joining the upper and lower halves 1a and 1b forming the upper and lower halves 1a and 1b. The upper and lower halves 1a and 1b are connected by rotationally inserting the screws 5 into the screw holes 1f corresponding to the screw holes 1f and the other screw holes 1g.

(Problems to be solved by the invention) Figures 7 and 8 are similar to the above-mentioned figures 5 and 6.
FIG. 7 is a cross-sectional view of the main part showing the state of screw tightening in the tape guide shaft portion of the conventional tape cassette shown in the figures, and FIG. 7 is a view showing the state before screw tightening;
FIG. 8 is a diagram showing the state after screw tightening.

In order to form the cassette housing 1 in this kind of conventional tape cassette, as shown in FIG. 7, a screw 5 is rotated and inserted into a screw hole 1f corresponding to a tape guide shaft 4 which becomes a tape guide member. However, in this case, a stepped portion 1e (mainly a flat portion 1e ₂ ) is formed by an inclined portion 1e ₁ and a flat portion 1e ₂ formed in the longitudinal direction of the upper half 1a.
A slight gap a is formed between the guard panel 2 and the inner surface 2a' of the upper plate portion 2a of the guard panel 2.

That is, the guard panel 2
This guard panel 2 is provided to protect the magnetic tape exposed on the front of the cassette, and the lower end (lower half 1b) side of this guard panel 2 is attached to the lower half to prevent dust from entering the inside of the cassette case. It is desirable that they are in contact. Therefore, this guard panel 2
Normally, a biasing force in the direction of closing the lid is applied by a spring (not shown), and the above-mentioned design was adopted in order to provide flexibility in design, taking into account the installation accuracy of the spring, the molding conditions of the guard panel, etc. A gap a is formed between the stepped portion 1e and its inner surface 2a'. Also, in general,
Since this type of tape cassette has a magnetic tape inside, it is extremely rare to remove the screws 5 after the upper and lower halves 1a and 1b are assembled using the screws 5.

Furthermore, in order to firmly fix the upper and lower halves 1a and 1b, this kind of tape cassette has the following features:
Normally, the part that becomes the screw hole provided in the upper half 1a is called a blind hole and is not threaded.
It is formed smaller than the threaded portion of the screw 5. Therefore, when connecting the upper and lower halves 1a and 1b with the screws 5 to form a tape cassette with the tape guide member 4 installed in an appropriate position, when the screws 5 are tightened, the screws 5 first The tip head of the screw portion contacts the portion of the upper half 1a that will become the screw hole.

At this time, since there is no part between the upper half 1a and the guard panel 2 to stabilize the position in the height direction (thickness direction of the tape cassette), the gap a remains as it is. When the screw 5 is further tightened, the tip of the flat part 1e ₂ (the part provided on the front plate part 2b side of the guard panel 2 in FIG. 7) is attached to the upper plate part 2a of the guard panel 2.
After contacting the inner surface 2a' of the upper half 1a, the two fulcrums of the inclined portion 1e1 of the upper half _1a , that is, the inclined portion _1e1
and the intersection of _{the sloped part 1e 1 and} the longitudinal direction of the upper half 1a on the opposite side to the intersection of The boss portions 1a 1 and 1b 1 of the upper and lower halves _1a and _1b are deformed (tilted) by the corresponding gap a', and therefore the tape guide member 4 attached thereto is also fixed in an inclined state. (the state shown in Figure 8).

As described above, since the tape guide member 4 is fixed at an angle, there is a problem that the tape running becomes unstable and the tape ends are damaged.

(Means for Solving the Problems) The present invention was made in view of the above problems, and is formed of upper and lower halves 1a and 1b, and the upper and lower halves 1a and 1b are connected to tape guide members 4. In this tape cassette, a cassette housing 1 is constructed by connecting the tapes with screw members 5 through the tape cassette, and a guard panel 2 protects the tape exposed on the front surface of the cassette housing 1. 1e, and an upper surface portion 1a 1 of the upper half 1a is provided in a part of this stepped portion _1e.
The tape cassette is characterized in that the guard panel 2 is provided with flat portions 1c ₁ and 1c ₂ substantially on the same plane as the above, and notches 2a ₁ and 2a ₂ that fit into the flat portions 1c ₁ and 1c ₂ . This is what we provide.

(Example) Figs. 1 to 4 show an embodiment of the tape cassette according to the present invention. Fig. 1 is a perspective view of the entire tape cassette, and Fig. 2 shows a state in which the guard panel is removed from the state shown in Fig. 1. FIGS. 3 and 4 are perspective views showing the state in which the lid is opened; FIGS. 3 and 4 are cross-sectional views of essential parts showing the tape guide shaft portion of the tape cassette according to the present invention in which the screws are tightened; FIG. 3 shows the state before the screws are tightened. FIG. 4 is a diagram showing the state after screw tightening.

In the figure, the same components as those in the conventional example described above are denoted by the same reference numerals, and detailed explanation thereof will be omitted.

In FIGS. 1 and 2, upper and lower halves 1a,
Upper half 1a of cassette housing 1 formed of 1b
The upper surface part 1 of the upper half 1a is located at a position corresponding to the tape guide member 4 on the front side (guard panel 2 side).
A plurality of flat portions 1c ₁ and 1c ₂ are provided which are substantially on the same plane as a ₁ .

Further, the cassette housing 1 is rotatably provided with a guard panel 2 so as to cover the front part thereof, as in the conventional example, and this guard panel 2 is attached to the upper plate part 2.
a, a front plate part 2b and a side plate part 2c, but in the present invention, the flat parts 1c 1 and ₁ of the upper half 1a described above are attached to the upper plate part 2a of the guard panel 2.
Notches 2a ₁ and 2a ₂ are provided at positions that fit with c ₂ .

Note that the flat portions 1c ₁ and 1c ₂ are provided at positions corresponding to the tape guide members 4 of the step portion 1e provided on the upper half 1a side of the front portion 1d of the cassette housing 1, which is the tape running surface side. They are each provided so as to be larger than the outer diameter of the member 4.

In such a configuration, the upper and lower halves 1a,
1b with, for example, a screw 5 to form the cassette housing 1, the screw 5 is rotated and inserted into the screw hole 1f corresponding to the shaft of the tape guide member 4 as shown in the third figure. , the upper half 1a is provided with flat parts 1c ₁ and 1c ₂ , which regulate the position of the upper half 1a, so there is no gap like in the conventional case, and it is easy to tighten the screws. is carried out satisfactorily, and the tape guide member 4 is fixed vertically between the upper and lower halves without tilting.

Therefore, in the tape cassette according to the present invention, the tape can be run stably, so that the tape ends are not damaged and can be conveniently used as a tape cassette for a video tape recorder.

In addition, in the description of one embodiment of the present invention, an example was explained in which two plane parts were provided on the upper half 1a, but this number may be one or three or more. Further, its size may be smaller than the outer diameter of the tape guide member, and its shape is not necessarily limited to a square shape, but any shape can be selected in consideration of moldability. It is.

(Effects of the invention) As detailed above, the tape cassette according to the present invention has a stepped portion on the upper half, and a flat portion that is approximately flush with the upper surface of the upper half on a part of the stepped portion. Since the guard panel is provided with a notch that fits with this flat part, when forming a cassette housing by connecting the upper and lower halves with screws, this flat part allows the position of the upper half to be adjusted. Since the tape is regulated, the tape guide member can be fixed vertically between the upper and lower halves, which has the advantage of providing a tape cassette with stable tape running.

[Brief explanation of the drawing]

Fig. 1 is an overall perspective view showing an embodiment of the tape cassette according to the present invention, Fig. 2 is a perspective view showing a state in which the guard panel is closed compared to the state shown in Fig. 1, and Figs. 3 and 4 are FIG. 3 is a cross-sectional view of a main part showing a state in which the tape guide shaft of the tape cassette according to the present invention is tightened with screws, FIG. 3 is a view showing the state before tightening the screws, FIG. 4 is a view showing the state after tightening the screws, Fifth
The figure is an overall perspective view of a conventional tape cassette, FIG. 6 is a rear perspective view mainly showing screw tightening positions for joining the upper and lower halves forming the tape cassette shown in FIG. 5, and FIGS. 7 and 8 are The figure is a cross-sectional view of the main part showing the state of screw tightening in the tape guide shaft of a conventional tape cassette. Fig. 7 is a view showing the state before screw tightening, and Fig. 8 is a view showing the state after screw tightening. be. 1...Cassette housing, 1a...Upper half, 1b
... lower half, 1c ₁ , 1c ₂ ... plane part, 1e ...
Step portion, 2... Guard panel, 2a ₁ , 2a ₂ ... Notch, 4... Tape guide member.

Claims (1)

[Scope of utility model registration request] It is formed of upper and lower halves 1a and 1b, and on top of this,
A cassette housing 1 is constructed by connecting the lower halves 1a and 1b with a screw member 5 via a tape guide member 4, and a guard panel 2 is provided on the front surface of the cassette housing 1 to protect the exposed tape. In the tape cassette, the upper half 1a is provided with a stepped portion 1e, and a part of the stepped portion 1e is provided with flat portions 1c ₁ and 1c ₂ that are substantially flush with the upper surface portion _1a 1 of the upper half 1a. A tape cassette characterized in that the guard panel 2 is provided with notches 2a ₁ and 2a ₂ that fit into the flat parts 1c ₁ and 1c ₂ .