JPH03183078A - Tape cassette - Google Patents

Abstract

PURPOSE:To prevent a spring from jumping out even when opening or closing a shutter by making the spring thin and crimping the spring between the shutter and a recessed part provided in an enclosure. CONSTITUTION:A tape is housed in an enclosure 1 and the cross section of a shutter 7 is U-shaped. Then, the shutter can open and close windows 1, 3 and 4 of the enclosure 1 in a direction connecting the centers of a pair of reel inserting holes 5 and 6, and guides 8a and 8b can be slid by guide grooves 9a and 9b provided in the enclosure 1. One end of a spring 10 is engaged to the enclosure 1 and the other end is engaged to an almost U-shaped projection 11 provided on the inside of the shutter 7. Then, the spring is crimped by the enclosure 1 and the shutter 7. The spring 10 is housed in a recessed part 12 provided in the enclosure 1 and spread over so that block parts 13, 14 and 15 of the shutter 7 can close the windows 2, 3 and 4 of the enclosure 1 while engaging one end to a corner 12a of the recessed part 12 and engaging the other end to the almost U-shaped projection 11 of the shutter 7.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a tape cassette, and more particularly to the structure of a shutter of a tape cassette.

2. Description of the Related Art Some tape cassettes containing tape-shaped recording media (hereinafter referred to as tapes) have a magnetic head insertion window and a pinch roller insertion window covered with a shutter that can be opened and closed.

This is due to dust entering through the insertion window and recording/recording the tape.
This is to prevent damage to the recording/playback surface of the tape due to adhesion to the playback surface or accidental touching of the recording/playback surface by hands or the like.

Problems to be solved by the invention For example, the digital audio tape (
Hereinafter referred to as DAT. ), a rotary shutter 20 is used to protect the recording/playback surface of the tape, and a sliding shutter 21 is used to prevent dust from entering from the hub on which the tape is wound. There were problems in that there were many parts and manufacturing costs were high.

The present invention solves these conventional problems, and a technical object of the present invention is to provide a tape cassette shutter that has a simple structure and is inexpensive to manufacture.

Means for Solving the Problems In order to solve the above problems, the tape cassette of the present invention has the following features:
A casing in which the tape is stored, a shutter that has a U-shaped cross section and can be slid to open and close a window of the casing in a direction that connects the centers of a pair of reel insertion holes, and a It consists of a spring stretched so as to close a window of the housing, and the spring is housed in a recess provided in the housing, and is held between the housing and the shutter.

Also, one end of the spring engages with a recess in the housing, and the other end engages with the substantially U-shaped protrusion, so that when the shutter is assembled and inserted, the substantially U-shaped protrusion provided on the inside of the shutter passes through. A guide groove is provided in the housing.

Furthermore, an engaging portion is provided approximately in the center of the guide groove of the housing through which the approximately U-shaped projection provided on the inside of the shutter passes, and the other end of the spring is temporarily attached to this when the shutter is assembled and inserted into the housing. , is arranged so as to engage with a substantially U-shaped protrusion of the shutter.

Operation With the above configuration, the spring is housed in the recess of the tape cassette housing and the shutter, and the shutter is held in place to prevent the spring from jumping out into the tape storage area inside the housing where the tape is stored. It is held in place to prevent it from flying out.

Furthermore, when the shutter is assembled and inserted, the approximately U-shaped protrusion provided inside the shutter is easily guided by the guide groove provided in the housing, and one end of the spring engages with the recess of the housing, and the other end engages with the approximately U-shaped protrusion provided on the inside of the shutter. Since it engages with the letter-shaped protrusion, it will not come loose and assembly is easy.

In addition, by providing an engaging portion approximately in the center of the guide groove, the other end of the spring is temporarily installed, and when the shutter is assembled and inserted into the housing, it engages with the approximately U-shaped protrusion provided on the inside of the shutter. Since the springs are arranged like this, the springs can be assembled and inserted without coming off.

EXAMPLE A first example of the present invention will be described below based on the drawings.

FIG. 1 is a plan view of the tape cassette according to the first embodiment of the present invention, seen from the back side, FIG. FIG. 4 is a perspective view of the shutter as seen from the back side, FIG. 5 is a perspective view of the front surface of the tape cassette of the present invention viewed from an angle, and FIG. 6 is a perspective view of the tape cassette of the present invention. Fig. 7 is a plan view of the tape cassette shown in Fig. 6 as seen from the back when the shutter is opened; FIG. 7 is a detailed view showing the state of the spring before the shutter is assembled and inserted.

In FIGS. 1, 2, 3, and 4, reference numeral 1 denotes a housing in which the tape is housed, and a shutter 7 has a U-shaped cross section and a window 2 of the housing 1. 3. 4 can be opened and closed in the direction connecting the centers of the pair of reel insertion holes 5 and 6, and the guide 8 al
8b is a guide groove 9a provided in the housing 1.

The spring 10 has one end engaged with a substantially U-shaped protrusion 11 provided inside the shutter 7, and the spring 10 is slidable between the housing 1 and the shutter 7. It is held between.

FIG. 6 is a detailed perspective view showing the relationship between the shutter 7 and the spring 10 of the tape cassette of the present invention, in which only the approximately U-shaped protrusion 11 provided on the inside of the shutter 7 is shown, and the spring 10 is shown. In case 1 (in this example, on the back side)
It is housed in a recess 12 provided, one end of which engages with a corner 12a of the recess 12, and the other end of which engages with a substantially U-shaped protrusion 11 of the shutter 7, and the shielding portion 13 of the shutter 7. 14.
15 is the window 2 of the housing 1. 3. 4 is stretched to close.

The guide groove 16 is formed when the shutter 7 is assembled and inserted into the housing 1.
The approximately U-shaped projection 11 of the shutter 7 serves as a guide for passage, and the engaging portion 17 is connected to the approximately U-shaped projection 11 when the other end of the spring 10 is temporarily stretched and the shutter 7 is assembled and inserted.
A spring 10 is arranged to engage with the recess 11a of the spring 1.

At this time, the substantially U-shaped protrusion 11 has the protrusion flb of the protrusions fib and llc set short so that the other end of the spring 10 can exceed it.

The assembly operation of the tape cassette constructed as described above will be described below.

In the tape cassette of this embodiment, the window 2 of the housing 1 is always opened by the tension force of the spring 10. 3. 4 is closed by a shutter 7. FIG. 5 is a perspective view of the surface of the tape cassette seen obliquely.

FIG. 7 is a front view from the back when the shutter 7 is opened along the guide grooves 9a and 9b provided in the housing 1 against the tension force of the spring 10, and this is a perspective view seen from an angle. The figure is Fig. 3.

FIG. 8 is a detailed view just before the shutter 7 is assembled and inserted. When the shutter 7 is assembled and inserted into the housing 1 in the direction of arrow A, the spring 10 is inserted into the corner 12a of the recess 12 of the housing 1. One end is engaged with the substantially U-shaped protrusion 11 of the shutter 7.
The other end of the spring 10 is temporarily stretched around an engaging portion 17 approximately in the center of the guide groove 16 through which the spring 10 passes. At this time, the approximately U-shaped protrusion 11 of the shutter 7 touches the chamfered portion lea of the guide groove 16.
The other end of the spring 10 is guided into the convex part flb and guided to the convex part 11c, and the other end of the spring 10 is engaged with the concave part 11a.
Assembly and insertion are completed (Fig. 6).

In this embodiment, the configuration on the back side of the cassette tape has been described, but it goes without saying that the same applies to the front side of the cassette tape.

Next, a second embodiment of the present invention will be described based on the drawings.

FIG. 9 is a detailed perspective view showing the relationship between the shutter and spring of the tape cassette according to the second embodiment of the present invention.

FIG. 9 shows an embodiment in which the direction of the recess 11a of the substantially U-shaped projection 11 inside the shutter 7 in the first embodiment is approximately aligned with the direction in which the shutter 7 is assembled and inserted, Only the generally U-shaped protrusion 11 provided on the inside of the shutter 7 is shown, and its structure and operation are the same as in the first embodiment.

Further, if the substantially U-shaped projection provided on the shutter in the first and second embodiments is arranged on a line connecting the two guides, the opening and closing operations can be performed smoothly.

Effects of the Invention As described above, according to the tape cassette of the present invention, the spring is housed in the recess provided in the housing and is held between the shutter and the housing. The spring does not jump out into the internal tape storage area, nor does it jump out to the outside of the shutter.

Furthermore, when the shutter is assembled and inserted, the approximately U-shaped protrusion provided on the inside of the shutter is guided by the guide groove provided in the housing, so there is no risk of deformation or destruction, and one end of the spring engages with the recess in the housing. Since the other end engages with the recess of the approximately U-shaped projection of the shutter, it does not get over this engagement and come off.

Further, since the other end of the spring is temporarily installed at the substantially central engagement portion of the guide structure provided in the housing, assembly and insertion of the shutter can be performed extremely easily and at low cost.

[Brief explanation of drawings]

Fig. 1 is a plan view of the tape cassette of the present invention as seen from the back side, Fig. 2 is a perspective view of the back side of the tape cassette as seen from an angle, and Fig. 3 is a perspective view of the back side of the tape cassette of Fig. 2 when the shutter is opened. 4 is a perspective view of this shutter seen from the back side, FIG. 5 is a perspective view of the front surface of the tape cassette of the present invention seen from an angle, and FIG. 6 is a diagram showing the relationship between the shutter and spring of the tape cassette of the present invention. FIG. 7 is a plan view of the tape cassette shown in FIG. 1 as seen from the back when the shutter is opened; FIG. 8 is a detailed perspective view showing the relationship; FIG. 8 is a plan view of the tape cassette shown in FIG. 6 when the shutter is assembled and inserted. 9 is a detailed perspective view showing the relationship between the shutter and the spring of the tape cassette according to the second embodiment of the present invention; FIG.
Figure 0 is a perspective view for explaining the operation of a conventional tape cassette.1... Housing, 2.3.4... Window, 5, 6...
...Pair of reel insertion holes, 7...Shutter, 8a
, 8b...guide, 9a+9b...guide groove,
10... Spring, 11... Approximately U-shaped projection, 12... Recessed portion, 13, 14. 15...
Shielding part, 16... Guide groove, 17... Engagement part.

Claims (3)

[Claims] (1) A housing in which a tape-shaped recording medium is stored, a shutter having a U-shaped cross section and slidable to open and close a window of the housing in a direction connecting the centers of a pair of reel insertion holes, and the housing and the shutter. 1. A tape cassette comprising a spring stretched between the cassettes and the window of the casing to close the window at all times, the spring being housed in a recess provided in the casing and sandwiched between the casing and the shutter. (2) One end of the spring engages with the recess of the housing, and the other end engages with the approximately U-shaped projection, and when the shutter is assembled and inserted, the approximately U-shaped projection provided on the inside of the shutter passes through. 2. The tape cassette according to claim 1, wherein a guide groove is provided in the casing. (3) An engaging portion is provided approximately in the center of the guide groove of the housing through which the approximately U-shaped projection provided on the inside of the shutter passes, and the other end of the spring is temporarily attached to this, and the shutter is assembled and inserted into the housing. 3. The tape cassette according to claim 2, wherein the tape cassette is arranged so as to engage with a substantially U-shaped projection of the shutter.