JPH0568036B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a tape cassette incorporating a pair of tape reels around which a tape body is wound, and in particular to an improved tape cassette that has two or more types of tape reels with different diameters. This invention relates to a tape cassette that can be supported on a reel stand.

[Conventional technology]

Conventionally, only one type of tape cassette has been used for video tape recorders (hereinafter referred to as VTR), corresponding to the VTR according to each standard.

Incidentally, VTRs use tape cassettes that have different recordable times depending on the amount of information signals to be recorded and/or reproduced. In the case of tape cassettes, the amount of magnetic tape stored in the tape cassette is varied depending on the recordable time.
Focusing on these points, we proposed a VTR that allows tape cassettes with different amounts of magnetic tape to be stored and tape halves of different sizes to be used interchangeably. has been done. In other words, this VTR allows tape cassettes of different sizes to be freely exchanged and used.

In the same VTR, for example, there are three types of VTRs, such as small, medium, and large, with different information signal recording times and different maximum winding diameters of magnetic tape on the tape reel.
If different types of tape cassettes are to be supported on a common reel stand provided within the VTR, the diameter of the receiving surface of this reel stand will be determined by the smallest tape cassette. This is because if the diameter of the reel stand receiving surface is increased, the diameter of the reel support portion provided on the tape reel will be increased. As a result, the opening diameter of the opening through which the reel support portion provided on the tape reel faces the outside of the cassette half becomes large, and in the case of a small tape cassette, the mechanical strength of the cassette half becomes weak.

While tape cassettes of different sizes are made compatible so that they can be used in a common VTR, VTRs have also been proposed in which tape cassettes of different sizes are used exclusively as recording media.
In other words, a small tape cassette is used exclusively for
VTRs have been proposed that use dedicated VTRs and medium- and large-sized tape cassettes.

For VTRs that exclusively use medium-sized and large-sized tape cassettes, it is desirable to increase the size of the reel stand that supports the tape reels. That is,
By using a reel stand with a large diameter, there is less surface runout when the tape reel is rotated, and there is less rotational slip between the tape reel and the reel stand, making it possible to achieve stable rotational drive of the tape reel. This can contribute to stabilization of driving.

[Problem to be solved by the invention]

In this way, if tape cassettes of different sizes are made compatible so that tape cassettes with different sizes of cassette halves that house tape reels can be recorded and played back on the same VTR, for example, VTRs that exclusively use medium- and large-sized tape cassettes have disadvantages in terms of surface runout and rotational slip when the tape reel is driven to rotate. That is, the diameter of the reel stand supporting the tape reel is made small to correspond to the size of the tape reel of the small tape cassette.

Therefore, the present invention was proposed to solve these problems, and it is possible to hold the tape reel in the cassette half with two or more types of reel stands with different diameters, so that the tape reel in the cassette half can be held even if the cassette sizes are different. To provide a tape cassette which enables tape running when attached to the same VTR and which does not cause tape reel surface runout or rotational slip even when used in a VTR that exclusively uses medium-sized and large-sized tape cassettes. .

[Means to solve the problem]

In order to achieve this object, a tape cassette according to the present invention includes a pair of tape reels around which a tape body is wound, and a cassette half in which the pair of tape reels are arranged in parallel and rotatably built in. , the cassette half is provided with a pair of openings corresponding to the tape reels, and on the end face side facing the openings of each tape reel,
Two or more reel support parts having different diameters are provided around the reel axis.

[Effect]

When the tape cassette according to the present invention is installed in a recording and/or reproducing device such as a VTR, one or all of the two or more reel supports provided on the tape reel are directed toward the recording and/or reproducing device. It is supported by a reel stand provided. That is, depending on the size of the reel stand disposed on the recording and/or reproducing apparatus side, the reel support part including the inner reel support part or the outer reel support part is supported.

〔Example〕

Hereinafter, specific embodiments of the present invention will be described in detail based on the drawings.

The present invention relates to a tape cassette that is applicable to a VTR and allows tape cassettes of different sizes to be commonly installed with compatibility.

As shown in FIG. 1, the tape cassette according to the present invention includes a cassette half 3 formed by butting together an upper half 1 and a lower half 2,
Inside this cassette half 3, there is a pair of tape reels 4 used for sending out or winding up the magnetic tape 5.
are arranged in parallel at a predetermined interval. A magnetic tape 5 serving as a tape body is wound between a pair of tape reels 4, 4 disposed within the cassette half 3. At the upper and lower ends of these tape reels 4, 4, there are provided an upper flange 6 and a lower flange 7 that hold the magnetic tape 5 wound thereon and guide the winding.

A reel stand 9 that constitutes a tape reel drive mechanism on the VTR side is fitted into a reel stand fitting hole 8 provided at the center of the tape reel 4, and a reel stand 9 that constitutes a tape reel drive mechanism on the VTR side is fitted. As the reel stand 9 rotates, the tape reel 4 rotates and the magnetic tape 5 is fed out or wound up. Further, as shown in FIG. 2, a plurality of engagement pieces 10 that engage with the reel stand 9 are provided on the inner circumferential wall surface of the reel stand fitting hole 8.

By the way, on the lower end surface of the lower flange 7 of the tape reel 4, there are two concentric ring-shaped reel support parts with different diameters centered on the reel axis C, which is the rotation center of the tape reel 4. 11,
12 are provided. These reel support parts 1
1 and 12 face an opening 22 into which the reel stand 9 enters, which is provided in the lower half 2 constituting the lower surface side of the cassette half 3, as shown in FIG.

Here, the diameter a of the small diameter reel support portion 11 located on the inner peripheral side is smaller than the size of the cassette half 3 of the tape cassette shown in FIG. It is made equal to the diameter a of the reel support part 14 provided on the lower end surface of the tape reel 13 of the tape cassette of the same size.

Further, the diameter b of the large diameter reel support section 12 located on the outer circumference side of the inner circumference side reel support section 11 is as follows:
It has a diameter corresponding to the size of the reel mounting portion 15 of the reel stand 9 of the VTR, into which the tape cassette shown in FIG. 1 and tape cassettes larger than this tape cassette are exclusively mounted.

Note that the tape reel 4 to be placed on the upper surface of the peripheral edge of the reel mounting portion 15 of the reel stand 9 is
For example, a rubber sheet 16 is attached to maintain good closeness between the two.

Further, FIG. 4 shows a tape reel 17 that is applied to a large tape cassette that is larger in size than the tape cassette shown in FIG.

This tape reel 17 also has an inner peripheral side on its lower end surface having a diameter a equal to the diameter of the reel support section 14 provided on the lower end surface of the tape reel 13 of the small-sized tape cassette shown in FIG. reel support section 18;
An outer reel support part 19 having a diameter equal to the diameter b of the outer reel support part 12 of the tape reel 4 used in the medium-sized tape cassette shown in FIG. 1, which has a larger diameter, is provided. There is.
These reel supports 18 and 19 are provided in a reel shape concentrically with the reel axis C as the center, similar to the tape reel 4 shown in FIG.
These reel support parts 18 and 19 also have the first
Similar to the tape cassette shown in the figure, as shown in FIG. 3, it faces an opening 22 into which the reel stand 9 enters, which is provided in the lower half 2 constituting the lower surface side of the cassette half 3.

In this way, the tape reels 13, 4, 17 of each of the small, medium, and large size tape cassettes are commonly provided with small reel support parts 14, 11, 18 based on the small tape cassette. By supporting these reel supporting parts 14, 11, and 18 by a reel stand having a small-diameter reel mounting part, tape cassettes of various sizes can be commonly mounted on the same VTR to record and reproduce information signals. be able to do it.

In FIG. 5, a reel stand 20 installed in a VTR that can commonly use tape cassettes of various sizes and a VTR that can exclusively use small and medium-sized tape cassettes is shown in FIG. The reel support portion 11 of the tape reel 4 is shown to be engaged with the tape reel 4, and the reel support portion 11 of the tape reel 4 is I'm supported.

In addition, by providing the tape reels 4, 17 of medium-sized and large-sized tape cassettes with large-diameter reel support parts 12, 19, it is possible to exclusively use medium-sized and large-sized tape cassettes without using small-sized tape cassettes. As shown in FIG. 1, the VTR to be used can use a reel stand 9 having a large reel placing part 15 having a larger diameter than the reel placing part 21 of the reel stand 20 shown in FIG. 5. Therefore, the large and heavy tape reels 4, 17 with a large amount of winding of the magnetic tape 5 can be stably supported with a large support area, and the surface runout and rotational slip when the tape reels 4, 17 are driven to rotate can be stably supported. It will be possible to prevent this.

By the way, in the above-mentioned embodiment, tape reels 4 and 17 of medium-sized and large-sized tape cassettes are
There are two reel support parts 1 with different diameters on the lower end surface of the
1, 12 and 18, 19 were provided, but
On the tape reel 17 of the large tape cassette,
A reel support portion having a larger diameter than the large diameter reel support portion 19 located on the outer circumference side may be provided on the outer circumference side. For VTRs that exclusively use medium- and large-sized tape cassettes, a large-diameter reel support section 19 is used, and for VTRs that exclusively use large-size tape cassettes, this newly provided reel support section with the largest diameter is used. By using
Furthermore, it becomes possible to use a reel stand having a reel mounting portion with a larger diameter. This makes it possible to more reliably prevent surface runout and rotational slip when the large tape reel 17 is driven to rotate.

〔Effect of the invention〕

As described above, the tape cassette according to the present invention has two or more reel supports having mutually different diameters centered on the reel axis on the end face side facing the opening provided in the cassette half of the tape reel. Therefore, depending on the size of the reel stand disposed on the recording and/or reproducing device side, it is possible to support the reel support portion including the inner reel support portion or the outer reel support portion. .

Therefore, not only recording and/or reproducing apparatuses configured to exclusively use small-sized tape cassettes and having only a small reel stand corresponding to the tape reel of this small-sized tape cassette, but also medium-sized and This recording and/or reproducing device is designed to exclusively use large-sized tape cassettes, and the diameter of the reel mounting portion of the reel stand is increased to accommodate the tape reels of these medium-sized and large-sized tape cassettes. Allows for installation.

In particular, when the magnetic tape is installed in a recording and/or reproducing device in which the diameter of the mounting portion of the reel stand is increased to accommodate tape reels of medium- and large-sized tape cassettes, the amount of winding of the magnetic tape is large and the tape is heavy. Since a large tape reel can be stably supported with a large support area, it is possible to prevent surface runout and rotational slip when the tape reel is rotated, and it is possible to realize stable tape running. .

Furthermore, it is no longer necessary to reduce the size of the reel stand of the recording and/or playback device, which allows small, medium, and large size tape cassettes to be used in common, to accommodate the small size tape cassette. No matter what size tape cassette is attached, stable rotational drive of the tape reel can be realized.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a medium-sized tape cassette according to an embodiment of the present invention, and FIG. 2 is a sectional view showing a tape reel used in the tape cassette.
FIG. 3 is a cross-sectional view showing a tape reel of a small-sized tape cassette, FIG. 4 is a cross-sectional view showing a tape reel of a large-sized tape cassette to which the present invention is applied, and FIG. 5 is a medium-sized tape reel shown in FIG. 1. FIG. 3 is a sectional view showing a state in which the tape reel of the tape cassette is supported by a reel stand having a small reel mounting portion. 3... Cassette half, 4, 17... Tape reel, 6... Upper flange, 7... Lower flange, 1
1, 12, 18, 19... Reel support section, 9, 2
0... Reel stand, 15, 21... Reel mounting section,
22...An opening provided in the cassette half.

Claims (1)

[Claims] 1. A tape reel having a tape body wound thereon, and a cassette half in which the pair of tape reels are arranged in parallel and rotatably built in, and the cassette half has the above-mentioned tape reel. A pair of openings are provided corresponding to each tape reel, and two or more reel supports having different diameters with respect to the reel axis are provided on the end face side facing the opening of each tape reel. A tape cassette is provided.