JPH10241329A - Magnetic tape cassette - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic tape cassette easy to assemble and capable of increasing the productivity in such a system as an opening/closing cover covering an opening part of the front surface of a cassette main body to freely open/close is constituted of three-lids. SOLUTION: This cassette 20 is provided with the system such as the opening/closing cover 27 covering the opening part of the front surface of the cassette main body 24 is constituted of three-lids, i.e., outer lid 29, top lid 30 and inner lid 31. In this case, the upper end of an inner cover guiding groove 35 is constituted to be opened to the upper surface of the cassette main body 24 so as to enable an inner cover slide pin 31c of the inner lid 31 to fit into an inner cover guiding groove 35 from the upper surface side of the cassette main body 24. At both ends of an upper cover plate of the top lid 30, slits 40a, 40b are provided for making a front cover connection part 30b or an arm part 30c easy to deflect outward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic tape cassette used for a magnetic recording / reproducing device such as a video tape recorder and various other information processing devices. The present invention relates to a magnetic tape cassette of a type in which an opening / closing lid that covers freely includes three lids.

[0002]

2. Description of the Related Art In recent years, with the increase in the density of magnetic recording, magnetic tape cassettes and video tape recorders (hereinafter referred to as V
TR) is becoming more compact. As a result, VTRs have been increasingly used outdoors, such as for taking pictures of landscapes and people. In view of the fact that the magnetic tape cassette is particularly intended for outdoor use, an open / close lid comprising two or three lids respectively covering the front and back surfaces of the tape has been put to practical use as a measure against dust.

FIGS. 7 to 9 show a conventional example of a magnetic tape cassette in which an opening / closing cover which covers an opening on the front surface of the cassette body is constituted by three lids. The magnetic tape cassette 1 has a cassette main body 4 having a front side provided with an opening 2 for inserting a tape pull-out member of a device such as a VTR, and a tape guide provided on the front side of the cassette main body 4 to stretch over the opening 2. A suspended magnetic tape 5;
Magnetic tape 5 stretched over opening 2 when carrying
And an opening / closing lid 7 assembled on the front side of the cassette main body 4 so as to cover the cassette body 4.

The cassette main body 4 is composed of an upper cassette half 4a and a lower cassette half 4b. The opening / closing lid 7 includes an outer lid (front lid) 9, a top lid (upper lid) 10, and an inner lid (rear lid) 11.
And three lids. The outer lid 9 includes a front cover plate 9a that covers the front side of the magnetic tape 5 stretched over the opening 2, and side plate portions 9b that protrude from both sides of the front cover plate 9a. And the side plate portion 9
A support pin 9c protrudes from the inner wall surface of the upper cassette half 4b, and the support pin 9c is rotatably fitted and supported in pin support holes on both side surfaces of the upper cassette half 4a near the front surface. Therefore, the outer lid 9 is rotatable around the support pin 9c.

[0005] The top lid 10 comprises an upper lid plate 10a which covers the upper part of the magnetic tape 5 stretched over the opening 2;
A front lid connecting portion 10b that rotatably connects both ends on the front edge side of the upper lid plate 10a to an upper end edge of the front lid plate 9a, and an arm portion 10c extending from a rear edge of the upper lid plate 10a. An upper lid slide pin 10d which is protruded and slidably engages with an upper lid guide groove 13 formed on both side surfaces of the upper cassette half 4a. This top lid 10
When the outer lid 9 is opened, the front lid connecting portion 1
The upper cover slide pin 10d moves along the upper cover guide groove 13 along with the pivotal movement of the support shaft 9b around the support pin 9c, and as shown in FIG. Move to the rear end side.

The inner lid 11 is provided with the opening 2
Cover plate 11a that covers the rear side of the magnetic tape 5 stretched around
An upper lid connecting portion 11b for rotatably connecting an upper edge of the inner lid plate 11a to the upper lid plate 10a; and an inner lid plate 11a.
And an inner lid slide pin 11c slidably engaged with an inner lid guide groove 15 formed on the inner side surface of the cassette body 4 so as to protrude from both ends on the lower edge side.

When the outer lid 9 is opened, the upper lid connecting portion 11b follows the movement of the top lid 10, and the inner lid slide pin 11c moves inward with the movement of the upper lid connecting portion 11b. It moves on the lid guide groove 15. That is, as shown in FIG. 9, the inner lid 11 retreats above the opening 2 following the opening operation of the top lid 10.

[0008] The magnetic tape cassette 1 as described above uses a VT.
When loaded into the R device, the side plate 9b of the outer lid 9 is pushed upward by a lid opening pin (not shown) provided on the device side, and in conjunction with the opening operation of the outer lid 9 at that time, The top lid 10 and the inner lid 11 open the lid. When taking out the magnetic tape cassette 1 from the VTR device, each lid performs a lid closing operation, contrary to the loading operation.

[0009]

A magnetic tape cassette 1 having such a three-lid type opening / closing lid 7 is disclosed.
When assembling, the outer lid 9, the top lid 10 and the inner lid 11 are temporarily assembled in advance, and then the upper lid slide pin is inserted into the upper lid guide groove 13 provided in the upper cassette half 4a. 1
With the three lids 9, 10, 11 attached to the upper cassette half 4a while inserting 0d, then,
The upper cassette half 4a and the lower cassette half 4b are assembled.

However, in such an assembling procedure, the assembling of the lower cassette half 4b for accommodating a large number of components and the upper cassette half 4a is the last, and the inner lid 11 is inserted into the inner lid guide groove 15 of the lower cassette half 4b. At the same time as the operation of fitting the lid slide pin 11c, the positioning and the like of a large number of components housed in the lower cassette half 4b must be performed.
There was a problem that it was difficult to improve productivity.

Accordingly, an object of the present invention is to solve the above-mentioned problem, and a magnetic tape cassette of a type in which an opening / closing lid for opening and closing an opening on the front surface of a cassette body is constituted by three lids, An object of the present invention is to provide a magnetic tape cassette which is easy to assemble and can improve productivity.

[0012]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a pair of reels rotatably mounted by winding a magnetic tape in a cassette body, and to openably and closably cover an opening in the front surface of the cassette body. A magnetic tape cassette provided with an opening / closing lid attached to the cassette tape, wherein the opening / closing lid is provided on a front lid plate that covers the front side of the magnetic tape stretched over the opening and on both side portions near the front of the cassette body. An outer lid having side plates projecting from both sides of the front lid plate supported by the shaft, an upper lid plate covering above a magnetic tape stretched over the opening, and both ends on a front edge side of the upper lid plate; A front cover connecting portion rotatably connecting the upper cover to the upper edge of the front cover plate, and an upper cover formed on both side surfaces of the cassette body by projecting from an arm extending from a rear edge of the upper cover plate. Top cover slidably engages the guide groove And a top lid and a Dopin,
An inner lid plate covering the rear side of the magnetic tape stretched over the opening, an upper lid connecting portion rotatably connecting an upper edge of the inner lid plate to the upper lid plate, and both lower end sides of the inner lid plate; And an inner lid slide pin slidably engaged with an inner lid guide groove formed on the inner side surface of the cassette body, the inner lid slide pin of the inner lid. The upper end of the inner lid guide groove is open to the upper surface of the cassette body so that the upper surface of the cassette main body can be fitted into the inner lid guide groove from the upper surface side,
At least one end of the top lid plate of the top lid is provided with a slit for facilitating outward bending of the front lid connecting portion and the arm portion.

According to the above construction, the upper end of the inner lid guide groove is open to the upper surface of the cassette main body, and even after the cassette main body and the outer lid are assembled, the inner lid slide pin of the inner lid can be moved inside the cassette main body. It becomes possible to fit into the lid guide groove. In addition, since at least one end of the top lid plate of the top lid is provided with a slit that facilitates outward bending of the front lid connecting portion and the arm portion, even after the cassette body and the outer lid are assembled, Align the lid near the assembly location from the top side of the cassette body, and push in while using the slits to elastically displace the front lid connecting part and the arm part outward, the front lid connecting part is placed in the corresponding location of the outer lid, and The upper cover slide pin protruding from the arm portion can be fitted into the corresponding upper cover guide groove by going over the corner of the upper edge of the cassette body.

Therefore, in the magnetic tape cassette of the present invention, the inner lid and the top lid can be assembled after the upper and lower cassette halves constituting the cassette main body and the outer lid have been assembled.
Therefore, it is not necessary to simultaneously perform the operation of fitting the slide pins of the respective lids into the guide grooves and the positioning of a large number of components housed in the lower cassette half.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a magnetic tape cassette according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is an exploded perspective view showing a relationship between an opening / closing lid and a cassette body in a magnetic tape cassette according to an embodiment of the present invention, and FIG. 2 is a main part showing a procedure for assembling the opening / closing lid in the magnetic tape cassette shown in FIG. FIG. 3 is a perspective view, FIG. 3 is a cross-sectional view of a main part showing an operation of assembling the inner lid in the magnetic tape cassette shown in FIG. 1, and FIG. FIG. 5 is a sectional view showing the operation of the engaging portion during the operation of assembling the top lid in the magnetic tape cassette shown in FIG. 1, and FIG. 6 is the end of the operation of assembling the top lid in the magnetic tape cassette shown in FIG. It is a principal part top view which shows the state at the time.

The magnetic tape cassette 20 of this embodiment is
A cassette main body 24 having an opening 22 for inserting a tape pull-out member on the apparatus side such as a VTR on the front side, an upper cassette half 24a and a lower cassette half 24b constituting the cassette main body 24, and being turned into the lower cassette half 24b. A pair of reels 23 and 25 movably arranged, and the lower cassette half 24 wound around the two reels 23 and 25.
b, the cassette main body 24 is covered so that the magnetic tape 5 stretched over the opening 22 by a tape guide provided on the front surface of the cassette 22 and the magnetic tape 5 stretched over the opening 22 when the portable device is carried. And an opening / closing lid 27 attached to the front side of the front panel. Various components other than the reels 23 and 25 around which the magnetic tape 5 is wound are accommodated between the upper and lower cassette halves 24a and 24b, but those accommodating components are omitted in FIG. .

The opening / closing lid 27 is composed of three lids, an outer lid 29, a top lid 30, and an inner lid 31. The outer lid 29
The front cover plate 29a covers the front side of the magnetic tape 5 stretched over the opening 22, and side plate portions 29b projecting from both sides of the front cover plate 29a. A support pin 29c is projected from an inner wall surface of the side plate portion 29b, and the support pin 29c is rotatably fitted into the pin support holes 32 on both side portions of the upper cassette half 24a near the front surface of the upper cassette half 24a. Supported. Therefore, the outer lid 29 is rotatable about the support pin 29c.

The top lid 30 is connected to the opening 22
Cover plate 30a that covers the upper part of the magnetic tape 5 stretched over
And both ends on the front edge side of the upper lid plate 30a are connected to the front lid plate 29.
a front lid connecting portion 30b rotatably connected to the upper edge of
An arm portion 30c extending from a rear edge of the upper cover plate 30a
And an upper lid slide pin 30d which protrudes from the arm 30c and is slidably engaged with an upper lid guide groove 33 formed on both side surfaces of the upper cassette half 24a.

In the case of this embodiment, the front lid connecting portion 30b
Are locking holes 29 formed at both ends of the upper edge of the front cover plate 29a.
d. The top lid 30 is
When the outer lid 29 is opened, the upper cover slide pin 30d moves along the upper cover guide groove 33 along with the pivotal movement of the front cover connecting portion 30b around the support pin 29c, and is substantially flush with the upper surface of the cassette body 24. In parallel, it moves to the rear end side of the cassette main body 24.

The inner lid 31 is connected to the opening 2
Inner cover plate 31 for covering the rear side of magnetic tape 5 stretched around
an upper cover connecting portion 31b for rotatably connecting an upper edge of the inner cover plate 31a to the upper cover plate 30a;
and an inner lid slide pin 31c slidably engaged with an inner lid guide groove 35 formed in the inner side surface of the cassette body 24, protruding from both lower edge side ends of the cassette body 24. In the case of the present embodiment, as shown in FIGS. 3 and 4, the upper lid connecting portion 31b is a pin that fits into a support hole 30f on a support piece 30e protruding from the upper lid plate 30a.

When the outer lid 29 is opened, the upper lid connecting portion 31b follows the movement of the top lid 30, and the inner lid slide pin 31c moves inward as the upper lid connecting portion 31b moves. It moves on the lid guide groove 35. That is, the inner lid 31 retreats above the opening 22 following the opening operation of the top lid 30.

The above-described magnetic tape cassette 20 is a VTR
When loaded into the device, the side plate portion 29 of the outer lid 29 is opened by a cover opening pin (not shown) provided on the VTR device side.
b is pushed upward, and the outer lid 29 at that time is
, The top lid 30 and the inner lid 31 perform the lid opening operation. When taking out the magnetic tape cassette 20 from the VTR device, the respective lids perform a lid closing operation, contrary to the loading operation.

In the case of the magnetic tape cassette 20 of the present embodiment, as shown in FIG. 3, the inner lid slide pin 31c of the inner lid 31 can be fitted into the inner lid guide groove 35 from the upper surface side of the cassette body 24. The upper end of the inner lid guide groove 35 is open to the upper surface of the cassette body 24. Also, as shown in FIGS. 1 and 2,
At both ends of the top lid plate 30a of the top lid 30, there are provided slits 40a and 40b for easily bending the front lid connecting portion 30b and the arm portion 30c outward.

Further, in the case of the present embodiment, as shown in FIG. 4, the upper lid slide pin 30d is inserted into the upper lid guide groove 33 from the upper surface side of the cassette body 24 at the front end side of the upper lid guide groove 33. The open portion 38 is not closed by the side wall portion 29b of the outer lid 29.

In the magnetic tape cassette 20 of this embodiment, as shown in FIGS. 2 and 3, the upper end of the inner lid guide groove 35 is opened to the upper surface of the cassette body 24, so that the cassette body 24 and the outer lid 29 are separated. Even after assembly, the inner lid slide pin 31c of the inner lid 31 can be fitted into the inner lid guide groove 35 on the cassette body 24 side.

Further, the upper cover guide groove 33 is connected to the cassette body 2.
4, the upper cover slide pin 30d of the top lid 30 is kept open even after the cassette body 24 and the outer lid 29 are assembled, as shown in FIG. It is possible to easily fit into the upper cover guide groove 33 through the hole 38. Further, slits 40a and 40b are provided at both ends of the top lid plate 30a of the top lid 30 to make the front lid connecting portion 30b and the arm portion 30c easily bend outward, so that the cassette body 24 and the outer lid are provided. 29, the upper cover slide pin 30d without using the opening 38.
Can be fitted into the upper lid guide groove 33.

That is, even after assembling the cassette body 24 and the outer lid 29, the top lid 30 is aligned with the vicinity of the assembly point from the upper surface side of the cassette body 24, and the slits 40a and 40b are used as shown in FIG. When the front lid connecting portion 30b and the arm portion 30c are pushed in while being elastically deformed outward, the front lid connecting portion 30b protrudes from the locking hole 29d at the upper edge of the outer lid 29 and from the arm portion 30c. The upper cover slide pin 30d can be fitted into the corresponding upper cover guide groove 33 over the corner of the upper edge of the cassette main body 24, and a good assembled state can be obtained as shown in FIG. it can.

Therefore, the above-described magnetic tape cassette 2
According to 0, the inner lid 31 and the top lid 30 can be assembled after the upper and lower cassette halves 24a, 24b constituting the cassette main body 24 have been assembled with the outer lid 29. Therefore, the slide pins 30d, 3 of the lids 29, 30, 31 described above are used.
Since it is not necessary to simultaneously perform the operation of fitting the 1c into the guide grooves 33 and 35 and the positioning of a large number of components housed in the lower cassette half 24b, the assembly becomes easy and the productivity can be improved. .

In this embodiment, slits 40a and 40b are provided at both ends of the upper lid plate 30a of the top lid 30 in order to make the upper slide pin 30d and the arm portion 30c easily bend. May be provided only at one end of the upper lid plate 30a.
Further, in the case of the present embodiment, since the opening portion 38 for opening the upper lid guide groove 33 provided on the cassette body 24 side to the upper surface side of the cassette body 24 is provided, the arm portion 30 c of the top lid 30 is bent. The slit 40b for facilitation may be omitted. The dimensions of the slit can be appropriately selected as design items.

[0030]

According to the magnetic tape cassette of the present invention,
With the structure in which the upper end of the inner lid guide groove is opened to the upper surface of the cassette main body, even after assembling the cassette main body and the outer lid, the inner lid slide pin of the inner lid can be fitted into the inner lid guide groove on the cassette main body side. . Also, at least one end of the top lid plate of the top lid is provided with a slit for easily bending the front lid connecting portion and the arm portion outward, so that the top lid can be assembled even after the cassette body and the outer lid are assembled. Align the lid near the assembly location from the top side of the cassette body, and press in while using the slits to elastically deform the front lid connecting part and the arm part outward, the front lid connecting part goes to the corresponding part of the outer lid, and The upper cover slide pin protruding from the arm portion can be fitted into the corresponding upper cover guide groove by going over the corner of the upper edge of the cassette body. Therefore, in the magnetic tape cassette of the present invention, the inner lid and the top lid can be assembled after the upper and lower cassette halves constituting the cassette main body have been assembled with the outer lid. Therefore, since it is not necessary to simultaneously perform the operation of inserting the slide pins of the lids into the guide grooves and the positioning of a large number of components housed in the lower cassette half, the assembly is facilitated and the productivity is improved. Can be.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a relationship between an opening / closing lid and a cassette main body in a magnetic tape cassette according to an embodiment of the present invention.

FIG. 2 is an essential part perspective view showing a procedure for assembling an opening / closing lid in the magnetic tape cassette shown in FIG. 1;

FIG. 3 is a sectional view of a main part showing an operation of assembling an inner lid in the magnetic tape cassette shown in FIG. 1;

FIG. 4 is a sectional view of a main part showing an operation of assembling the top lid in the magnetic tape cassette shown in FIG. 1;

FIG. 5 is a cross-sectional view of a main part showing an operation of an engaging portion at the time of assembling the top lid in the magnetic tape cassette shown in FIG.

6 is a main part plan view showing a state at the time of finishing the assembling operation of the top lid in the magnetic tape cassette shown in FIG. 1;

FIG. 7 is a perspective view of a conventional three-lid type magnetic tape cassette in an assembled state.

8 is a cross-sectional view of a main part showing a state where a lid of the magnetic tape cassette shown in FIG. 7 is closed.

9 is a cross-sectional view of a main part showing a state where a lid of the magnetic tape cassette shown in FIG. 7 is opened.

[Explanation of symbols]

 Reference Signs List 20 Magnetic tape cassette 22 Opening 24 Cassette body 24a Upper cassette half 24b Lower cassette half 27 Opening / closing lid 29 Outer lid 29a Front lid plate 29b Side plate 29c Support pin 29d Lock hole 30 Top lid 30a Top lid plate 30b Front lid connection Part 30c arm part 30d upper lid slide pin 31 inner lid 31a inner lid plate 31b upper lid connecting part 31c inner lid slide pin 33 upper lid guide groove 35 inner lid guide groove 40 slit

Claims (1)

[Claims] 1. A cassette comprising: a pair of reels rotatably mounted by winding a magnetic tape in a cassette main body; and an opening / closing lid mounted to open and close an opening on the front surface of the cassette main body. In the magnetic tape cassette, the opening / closing lid is formed on both sides of the front lid plate that covers the front side of the magnetic tape stretched over the opening and the front lid plate that is pivotally supported on both side surfaces near the front surface of the cassette body. An outer lid having a protruding side plate portion, an upper lid plate for covering above a magnetic tape stretched over the opening, and both ends of a front edge side of the upper lid plate pivoted to an upper edge of the front lid plate. An upper cover projecting from a front cover connecting portion to be freely connected and an arm portion extending from a rear end edge of the upper cover plate, and slidably engaged with upper cover guide grooves formed on both side surfaces of the cassette body. A top lid with a slide pin, An inner lid plate that covers the rear side of the magnetic tape stretched over the opening, an upper lid connecting portion that rotatably connects an upper edge of the inner lid plate to the upper lid plate, and lower edge ends of the inner lid plate; And an inner lid slide pin protruding from the inner lid and slidably engaging with an inner lid guide groove formed on the inner side surface of the cassette body, and an inner lid slide pin of the inner lid. The upper end of the inner lid guide groove is open to the upper surface of the cassette body so that the upper lid can be fitted into the inner lid guide groove from the upper surface side of the cassette main body, and at least one end of the upper lid plate of the top lid. A magnetic tape cassette provided with a slit for facilitating outward bending of the front lid connecting portion and the arm portion.