JPH0442482A - cassette half - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cassette for storing magnetic tapes.

BACKGROUND OF THE INVENTION In recent years, EB tape recording devices have become widespread, and improvement of the structure of the cassette half is an important issue.

There are two ways to store magnetic tape: storing it as an open reel and storing it in a cassette half. A major advantage of storing in a cassette half is that it is easy to operate, and currently, most people use the sumo cassette half, especially for consumer use.

Meanwhile, magnetic recording technology has become more dense, and cassette halves have become smaller. -For example, compared to video cassettes known as VH3 and β formats, 8mm formats have been significantly miniaturized. The trend in LA recording technology has been to narrow tracks, increase linear density, and make tape thinner, making it possible to store large amounts of information in compact cassettes.

Hereinafter, a conventional cassette half will be explained based on the drawings.

FIG. 3 is a top view showing the structure of a conventional cassette half, where 1 is an unwinding reel, 2 is a take-up reel, 3 is a half body, 4 is a magnetic tape, 5 is a lid, and 6 is a post.

When storing a magnetic tape, the lid portion 5 is generally closed in order to prevent dust and the like and improve storage performance. Some formats with low recording density do not have this lid structure. However, with the progress of high-density recording, the lid structure has become more and more thorough. Furthermore, in new formats, the unwinding reel 1 and the winding P5 reel 2 are usually locked to prevent rotation when the tape is stored, in order to prevent troubles caused by disturbances in the magnetic tape.

When using a magnetic tape, the lid portion 5 is opened so that the magnetic tape 4 can come into contact with the magnetic head on the cassette deck main body side. Depending on the format, the magnetic tape drawer post on the cassette deck side moves to perform loading, while in other cases the post does not move and the magnetic head comes into direct contact with it. In any case, a post 6 is provided to place the magnetic tape 4 in a position where it can come into contact with the magnetic head.

Problems to be Solved by the Invention With such a conventional cassette half structure, when the magnetic tape 4 is stored and stored in the cassette half, a major problem is shape transfer.

Conventionally, a problem has been the shape transfer between the unwinding reel 1 and the take-up reel 2, and serious problems have been the surface properties and the shape of the step between the reel rib and the reel when reel ribs are used. However, all of these problems can be considerably improved by giving sufficient consideration. Another part where shape transfer is a problem is the post 6 part. In conventional magnetic tapes, for example, in the VHS format, the thickness of the magnetic tape is about 16 to 19 μm, so shape transfer due to graining hardly occurs. However, in the 8 mm format, the magnetic tape thickness is 10.6 mm.
It becomes as thin as ~13 μm, and shape transfer becomes a problem depending on the storage environment. The shape transfer mentioned here is slightly different from the shape transfer that occurs in the reel section, in that the magnetic tape 4 is
This is a phenomenon where the tape becomes curly and only the wrapped portion curls strongly in the longitudinal direction of the tape depending on the diameter of the post. When the shape transfer by this post 6 occurs,
The portion where the shape transfer has occurred can no longer make stable contact with the head, resulting in momentary vertical synchronization failure in the case of a video tape recorder. In the future, in order to miniaturize and increase the density of cassette halves, it will be necessary to use magnetic tape with a thickness of 10.5 μm or less, which is currently used, and this problem of shape transfer will become more and more serious. Conceivable. As a countermeasure, increasing the post diameter may be considered, but even the current 8 mm format has a diameter equivalent to 6 mm, and if the post diameter is increased too much, the cassette half will become larger.

As described above, since the conventional cassette half is provided with a post for pulling out the magnetic tape, there is a problem in that when a thin magnetic tape is used, shape transfer occurs due to the post, and stable signal recording and reproduction cannot be performed.

The present invention has been made to solve the above-mentioned problems, and aims to provide a cassette half that reduces the adverse effects of shape transfer and has a slide portion that provides both airtightness and ease of pulling out magnetic tape.

Means for Solving the Problems In order to achieve the above object, the present invention provides a structure in which only one post is provided that comes into contact with the magnetic tape during storage and storage, and it has a lid part and a slide part, and the slide part is This cassette half is slidable so that it is located at a position that covers the introduction part of a tape drawer post when the magnetic tape is stored and stored, and is located at a position where the introduction part of the tape drawer post is exposed when the magnetic tape is used.

Effect of the present invention With the above-described configuration, the sliding part covers the tape drawer post introduction part during tape storage and storage, keeping the cassette half airtight, and when the tape is used, the tape drawer post introduction part is exposed and the tape drawer post introduction part is exposed. Allows for withdrawal.

EXAMPLE Hereinafter, a cassette half according to an example of the present invention will be described with reference to the drawings.

FIG. 1 is a top view showing the structure of a cassette half according to an embodiment of the present invention. 7 is an unwinding reel, 8 is a take-up reel, 9 is a half body, 10 is a magnetic tape, 11 is a lid portion, 12 is a post, and 13 is a magnetic tape pull-out post position. FIG. 2(a) is a bottom view showing the state of the cassette half according to an embodiment of the present invention when the magnetic tape is stored and stored, and FIG. 2(b) is a bottom view showing the state when the magnetic tape is pulled out. . In FIG. 2, a slide portion 14 is slidably provided on the lower surface of the cassette half exterior.

As is clear from FIGS. 1 and 2, when the magnetic tape is stored and stored, the cartridge half is sealed by the lid part 11 and the slide part 14, and when the magnetic tape is used for withdrawal, the lid part 11 opens and the slide part 14 slides. By moving the magnetic tape 10, the magnetic tape 10 can be inserted and the magnetic tape extraction post can be inserted.

In addition, in the embodiment of the present invention, the number of posts is reduced from two in the conventional example to one, and
The wrapping angle was also 90° or more in the conventional example, but the wrapping angle was significantly reduced to about 4d), and the influence of shape transfer was reduced.

As described above, according to the cassette half of one embodiment of the present invention, only one post for guiding the magnetic tape is provided inside the cassette half main body, a slidable slide portion is provided on the lower surface of the cassette half main body, and the slide The part covers the introduction part of the tape drawer post when storing and storing the tape.
By providing the cassette half with a structure that slides to expose the tape drawer post introduction part when the tape is used, it is possible to obtain a cassette half that can maintain airtightness while reducing shape transfer by the posts.

Effects of the Invention As is clear from the above embodiments, a magnetic tape is placed inside a case consisting of a cassette half main body composed of five sides and a lid part that can be opened and closed without covering the opening of the main body. The tape is wound on an unwinding reel and a take-up reel and stored, and a post for guiding the tape is provided inside the cassette half, and a magnetic tape drawer post is provided on the lower surface of the main body near the post. an introduction part is provided, and a slide part is provided on the outside of the lower surface, the slide part being in a position to expose the drawer post introduction part when the magnetic tape is used, and in a position to cover the tape drawer post introduction part when storing the magnetic tape. By using a sliding cassette half as shown in FIG. 1, it is possible to obtain a cassette half that can maintain airtightness while reducing shape transfer by posts.

[Brief explanation of drawings]

FIG. 1 is a top view showing the structure of the cassette half according to the position embodiment of the present invention, and FIG. Bottom view showing a certain state, Fig. 2 (b
) is a bottom view showing a state in which the slide portion of the cassette half according to the positional embodiment of the present invention exposes the tape drawer post introduction portion, and FIG. 3 is a top view showing the structure of the conventional cassette half. 7...Unwinding reel, 8...Take-up reel, 9...Cassette half body, 10...
...Magnetic tape, 11...-Lid section, 12...
... Post, 13 ... Post introduction position for tape drawer, 16 ... Post introduction part for tape bow drawing. Name of agent Patent attorney Shigetaka Awano and one other person Fig. 7

Claims (1)

[Claims] A magnetic tape is wound around an unwinding reel and a take-up reel and stored inside a case consisting of a cassette half main body composed of five sides and a lead part that can be opened and closed while covering the opening of the main body, A post for guiding the tape is provided inside the cassette half, an introduction part for a magnetic tape drawer post is provided on the lower surface of the main body near the post, and a slide part is provided outside the lower surface of the invention,
The cassette half is configured such that the sliding part is in a position to expose the drawer post introduction part when using the magnetic tape, and slides to be in a position to cover the tape drawer post introduction part when storing the magnetic tape.