JP2616521B2 - 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 used in a magnetic recording / reproducing apparatus for recording / reproducing a magnetic tape wound around a cylinder having a built-in magnetic head at a predetermined angle, such as a video tape recorder. .

[0002]

2. Description of the Related Art Conventionally, in a magnetic recording / reproducing apparatus, in particular, a video tape recorder, the same recording format is aimed at satisfying both the need for long-time recording and the need for miniaturization and weight reduction over recording time. While
There are systems with different cassette sizes. VT for broadcast
As R, the “D1 format standard” corresponds to the system. In the "D1 format standard", three types of cassettes (S, M, L) having different sizes are standardized.

FIG. 9 shows an S cassette having the shortest recording time,
FIG. 4 is a plan view of a tape running system when an M cassette having an intermediate recording time is mounted on a recording / reproducing apparatus. The M cassette 101 has a supply reel 102 and a take-up reel 103, and a magnetic tape 107 is stretched over the front surface in the space of the opening 106 by guide posts 104 and 105 erected on the cassette. The triangular area represented by the tangent lines 109 and 110 extending from the tape maximum winding diameter of the supply reel 102 and the outer diameter of the reel hub 108 corresponds to the M cassette 1
A tape guide area 111 that can guide the upper and lower cassette halves 01 out of the cassette space without contact. Therefore, the first post for guiding the magnetic tape coming out of the cassette must be arranged so that the magnetic tape is present in the tape guiding area 111. The position of the tangent line 109 is determined by the configuration of the side walls of the upper and lower halves. On the other hand, the tangent 110 is determined by a tangent connecting the guide post 104 and the reel hub 108. When the position of the guide post 104 is determined, the size of the opening 106 is naturally determined.
The setting of 11 has a close relationship with the setting of the size of the opening 106.

The S cassette 112 has the same size as the M cassette 101 in both the size of the opening 106 and the positions of the guide posts 104 and 105. Other structures are almost the same as those of the M cassette 101.
Due to the positional relationship of the reel hub 113, the tape guide area 119 of the S cassette is smaller than the tape guide area 111 of the M cassette 101, and is included in the tape guide area 111 of the M cassette 101.

Next, a description will be given of a tape traveling system for selectively mounting such two cassettes in a recording / reproducing apparatus and performing recording / reproducing. The rotating head cylinder 115 has a magnetic tape wound around 180 degrees and rotates at high speed. 116 is a capstan motor and 117 is a pinch roller. The magnetic tape 107 that has exited the supply reel 102 is an S cassette 112
Is wound around the post 118 in the tape guide area 119 of the S cassette 112, the magnetic tape that has left the supply reel 120 of the S cassette 112 is also guided to the S1 post 118 in a non-contact manner, including the upper and lower halves. Similarly, the arrangement of the post 121 is also considered so that the take-up reel 103 and the magnetic tape between the take-up reel 122 and the post 121 are guided in a non-contact manner with all other objects.

[0006]

According to the "D1 format standard", although the cassette size is different, the size and position of the opening are common, so that the tape guide area of the S cassette is the same as that of the M cassette. It is included in the tape guide area, and has a merit that a single running system can be used despite the use of two cassettes.

On the other hand, however, since the size and position of the opening are common, the size of the M cassette must be adjusted to the maximum size of the opening that can be obtained with the S cassette. By the way, since the opening must accommodate the post of the traveling system, it is desirable that the opening is large from the viewpoint of the tape loading mechanism design. Considering the design of the tape loading mechanism of the recording / reproducing apparatus using the M cassette or the L cassette, the size of the opening determined by the S cassette is a design limitation. This is not particularly a problem when using a large cassette for broadcasting called "D1 format standard". However, in the case of using a small cassette for home use, there is freedom in loading design. This is a major obstacle, such as a decrease in degree.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide an M cassette having an opening having a size larger than the opening of the S cassette while having a single traveling system.

[0009]

In order to achieve this object, a tape cassette according to the present invention comprises a magnetic tape having a leading end and a trailing end.
Suspended supply reel and take-up reel
Having an opening formed surrounding the magnetic tape
Tape cassette that is larger than a small tape cassette
Set, and put the magnetic tape out of the space of the half
The tape guiding area that can be guided is
The tape guide area and the small
The tape guide area of the mold tape cassette is on the supply reel side,
The take-up reels are configured to overlap each other,
The opening is larger than the opening of the small tape cassette.
This is a configuration having an interval.

[0010]

According to the present invention, the tape guide area of the small tape cassette partially overlaps with the tape guide area of the tape cassette by the above-described structure. Can be configured as a single unit. Furthermore, since the tape guide area is partially overlapped, it is not necessary to completely make the size of the opening completely common, and the opening having a size larger than the opening of the small tape cassette is used as the opening of the tape cassette. It can be.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. It should be noted that the tape cassette having a long recording time (hereinafter, referred to as L cassette) and the small tape cassette having a short recording time (hereinafter, referred to as S cassette) have a symmetrical configuration, so that only one of them will be described. Also,
The terms large tape cassette and small tape cassette are the same
A tape cassette that can be used on a deck,
It represents the typical size. Therefore, there are two sizes
Not limited to large cassettes, large, medium and small cassettes
Format.

FIG. 5 is an external plan view of the S cassette 1, and FIGS.
7 is a side view, FIG. 2 is a sectional view taken along line BB of FIG. 7, and FIG.
It is AA sectional drawing of. The S cassette 1 includes an upper half 9, a lower half 10, a front lid 5, and a slider 6. The slider 6 surrounds the periphery of the upper half 9 and the lower half 10 and is vertically connected at a part of the back surface of the magnetic tape 2 stretched to the front surface as shown in FIGS. The supply cassette 3 and the take-up reel 4 around which the tape 2 is wound are housed in the S cassette 1 as shown in FIG. Front lid 5 is S
The tape 2 stretched by the tape guides 1a and 1b of the cassette 1 is covered on the front surface. The slider 6 is pressed in the direction A by a spring (not shown), and the opening 1 of the S cassette 1 is opened.
1, the opening 11 is covered with a top surface and a bottom surface.
The slider 6 seals the tape 2 whose front surface is covered with the front cover 5 so as to face the front cover 5 and is slidably supported by the upper half 9 and the lower half 10 on both side surfaces. As shown in FIG. 6, the front lid 5 has a long hole 5a engaged with a guide pin 7 provided on the side surface of the upper half 9, while the long hole 5b engages with a guide pin 8 implanted in the slider 6. doing. When the slider 6 is moved in the direction B, the guide pins 8 also move together, so that the front lid 5 moves in the direction B while rotating counterclockwise (direction C) about the guide pins 7. As a result, as shown in FIG. 7, the magnetic tape 2 stretched on the front surface is exposed.

The tape guide area 12 shown by a dashed line in FIG.
Indicates an area where the magnetic tape 2 can be guided to the lower half 10 and the upper half 9 in a non-contact manner. The position and size are the thickness of the side wall 10a of the lower half 10, the tape guides 1a, 1
It depends on the position of b. When the positions of the tape guides 1a and 1b are determined, the width W1 of the opening 11 is necessarily determined. If the width W1 of the opening 11 is increased, the tape guide area 12 becomes smaller, and it becomes difficult to arrange the posts.
Opening 11 within a range that can secure the degree of freedom in the design of the traveling system
Is made as large as possible. The recording time of the S cassette 1 is one hour.

On the other hand, the L cassette 30, which is compatible with the S cassette 1 in terms of recording format, has a long recording time of 4 hours, and as shown in FIG. Has become.
Although the S cassette 1 has a configuration in which no flange is provided,
In the L cassette 30, a flange was formed. Slider 3
1, the front lid 32 is different in size from the slider 6 and the front lid 5 of the S-cassette 1, but has exactly the same configuration. The lower half 33 has substantially the same configuration as the tape guides 37 and 38.
Are integrally configured. The tape guide area 39 of the L cassette 30 is in a state as shown in FIG.

FIG. 1 shows an arrangement relationship between two cassettes when the S cassette 1 and the L cassette 30 are selectively mounted on a recording / reproducing apparatus. Areas 51 and 52 indicated by hatching are overlapping portions where the tape guide areas 12 and 39 of the S cassette 1 and the L cassette 30 overlap. The left and right overlapping portions 51 and 52 are provided in the S cassette 1
Does not cover the entire tape guide area 12 but is a part of it. With such a part, the L cassette 30 can be moved with respect to the tape guides 1a and 1b of the S cassette 1.
The tape guides 37 and 38 can be provided outside as shown in the figure, and the width W2 of the L cassette 30 is wider than the width W1 of the opening of the S cassette 1.

FIG. 8 shows an example of application of the traveling system. The magnetic tape 2 that has exited the supply reels 3 and 34 is post 40, 41, 4
The rotation reaches the rotary head drum 44 via 2 and 43. Further, via the posts 45, 46, and 47, the capstan 48, and the pinch roller 49, the take-up reels 4, 3
Reaches 5. At this time, the post 40
The tape leading to the post 4 in the area of the overlapping portion 51 shown in FIG.
Since the post 40 is disposed so as to be wound around zero, the magnetic tape 2 can travel without contacting any part of the S cassette 1 and the L cassette 30. Post 5
The arrangement of 0 is determined based on the same concept. Therefore, even in a recording / reproducing apparatus in which the L cassette 30 and the S cassette 1 are selectively mounted, the traveling system is the same, and the operation of the loading mechanism is the same regardless of the type of the cassette. The load for mounting two types of tape cassettes is not limited as far as the loading mechanism is concerned.

[0017]

As is apparent from the above description, according to the tape cassette of the present invention, in a system in which two types of tape cassettes having different sizes are directly mounted on a recording / reproducing apparatus without using an adapter, the L cassette is Since an opening wider than the width of the opening that the S cassette can maximize can be configured, it is easy to store the post of the traveling system in the opening of the recording / reproducing apparatus using only the L cassette. . This can increase the degree of freedom in the design of the traveling system, for example, the diameter of the post can be increased and the number of posts can be increased.

[Brief description of the drawings]

FIG. 1 is a plan view of an S cassette and an L cassette according to an embodiment of the present invention.

FIG. 2 is a plan view of an S cassette.

FIG. 3 is a plan view of the L cassette.

FIG. 4 is a side view of the S cassette with a front cover opened.

FIG. 5 is an external view of an S cassette.

FIG. 6 is a side view of the S cassette.

FIG. 7 is a side view of the S cassette with a front cover opened.

FIG. 8 is a plan view when the S and L cassettes are mounted on a recording / reproducing apparatus.

FIG. 9 is a plan view when a conventional S, L cassette is mounted on a recording / reproducing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 S cassette 3,34 Supply reel 4,35 Take-up reel 10 Lower half 11 Opening 12,39 Tape guide area 30 L cassette 33 Lower half

Continuation of the front page (72) Inventor Mitsuro Utsumi 1006 Kazuma Kadoma, Kazuma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-4-146581 (JP, A) JP-A-4-26974 (JP) , A)

Claims (4)

(57) [Claims] 1. A supply reel in which the start and end of a magnetic tape are locked.
And an opening formed around the take-up reel and the magnetic tape stretched over the front surface
Larger than a small tape cassette consisting of
A tape cassette capable of guiding the magnetic tape out of the space of the half.
To the supply reel side and the take-up reel side.
Each having the tape guide area and the tape of the small tape cassette
The guide area overlaps on the supply reel side and the take-up reel side.
And the opening is larger than the opening of the small tape cassette.
Tape cassette with a space. 2. A supply reel in which the start and end of a magnetic tape are locked.
And an opening formed around the take-up reel and the magnetic tape stretched over the front surface
Smaller than a large tape cassette consisting of
A tape cassette capable of guiding the magnetic tape out of the space of the half.
To the supply reel side and the take-up reel side.
Each having the tape guide area and the tape of the large tape cassette
The guide area overlaps on the supply reel side and the take-up reel side.
And the opening is smaller than the opening of the large tape cassette.
Tape cassette with a space. 3. A supply reel in which the start and end of a magnetic tape are locked.
And take-up reel can be mounted and stretched on the front
A small table with an opening formed around the magnetic tape
Tape cassette half larger than tape cassette half
The magnetic tape out of the space of the tape cassette half.
The tape guiding area that can be guided is
The tape guide area and the small tape cassette half
The guide area is heavy on the supply reel side and the take-up reel side.
It becomes configured to each other, wherein the opening is an opening portion of the small tape cassette half
Tape cassette half with a large space. 4. A supply reel in which the start and end of a magnetic tape are locked.
And take-up reel can be mounted and stretched on the front
It has an opening formed around the magnetic tape,
Tape cassette half smaller than tape cassette half
The magnetic tape out of the space of the tape cassette half.
The tape guiding area that can be guided is
The tape guide area and the large tape cassette half
The guide area is heavy on the supply reel side and the take-up reel side.
It becomes configured to each other, wherein the opening is the opening of the large-size tape cassette half
Tape cassette half with a small space.