JPH0442481A - Cassette half - Google Patents

Abstract

PURPOSE:To obtain a cassette half without generating shape transfer by a post by providing a movable post which performs the draw-out of a magnetic tape by an operation from the outside at the inside of the cassette half. CONSTITUTION:The movable post is provided at the inside of the cassette half, and the post is located at a position not coming in contact with the magnetic tape 8 when the tape is housed and held, and the operation to draw out a post magnetic tape 10 to the outside is performed by the operation from outside the cassette half when the tape is used. In other words, the position 7 of the movable post is set at a position where no magnetic tape 8 is wound across the post when the tape is housed and held, and when the magnetic tape is drawn out, the magnetic tape 10 is moved by the motion of the movable post, which enables loading on a cassette deck side to be performed. Thereby, it is possible to reduce the shape transfer.

Description

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

Conventional technologyThe reel-to-reel method for storing magnetic tapes is
There are two methods: storing it in a cassette and storing it in a half cassette. A major advantage of storing in a cassette half is that it is easy to operate, and currently, most consumer products use a cassette half.

On the other hand, magnetic recording technology has become more dense, and cassette halves have become smaller. -For example, VH8 and β
Compared to the well-known video cassette format, the 8 mm format has significantly become smaller. The trend in magnetic 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.

Figure 5 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 exterior, 4 is a magnetic tape, 6 is a lid part, and 6 is a fixed part. It's a post.

When storing magnetic tapes, the lid portion 6 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 /I/1 and the unwinding 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 6 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 formant, loading is performed by moving the magnetic tape drawer post on the cassette deck side, and in other cases the post does not move and the magnetic head comes into direct contact with it. In any case, a fixed post 6 is provided in order to place the magnetic tape 4 in a state 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.

Traditionally, the problem has been unwinding and winding! In the shape transfer of JA/2, 1. There were serious problems such as surface properties and the shape of the step between the reel hub and the reel when a reel hub was used. However, all of these problems can be considerably improved by giving sufficient consideration. Another part where shape transfer is a problem is the part of the fixed post 6.

In conventional magnetic tapes, for example, in the VHS format, the thickness of the magnetic tape is about 16 to 19 μm, and shape transfer by the fixed post 6 hardly occurs. However, in the 8 mm format, the magnetic tape thickness is 10.5 ~
It is thin, about 13 μm, and shape transfer becomes a problem depending on the storage environment. The shape transfer referred to here is slightly different from the shape transfer that occurs in the reel section, in which the magnetic tape 4 has a tendency to wrap around the fixed post 6, and only the wrapped portion is oriented in the longitudinal direction of the tape according to the post diameter. strongly car/I
/ This is a phenomenon that occurs. When this shape transfer by the fixed post 6 occurs, the portion where the shape transfer has occurred cannot stably contact the head, and in the case of a video tape recorder, instantaneous vertical synchronization failure occurs.

In the future, in order to make the cassette half smaller and more dense,
It is necessary to use the currently used magnetic tape having a thickness of 10.5 μm or less, and it is thought that this problem of shape transfer will become more and more serious.

One possible countermeasure would be to increase the post diameter, 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, because conventional cassette halfs are equipped with a fixed point for pulling out the magnetic tape, when a thin magnetic tape is used, shape transfer occurs due to the fixed post, making stable signal recording and playback impossible. .

The present invention solves the above-mentioned problems, and aims to provide a cassette half without shape transfer by posts.

Means for Solving the Problems In order to achieve the above object, the present invention provides a cassette half having a movable post inside the cassette half for pulling out a magnetic tape by an operation from the outside.

Effects According to the present invention, with the above-described configuration, the movable post moves so that there is no post that wraps around the magnetic tape at all when the magnetic tape is stored, or the corner of the magnetic tape is made smaller. When the magnetic tape is pulled out, the magnetic tape is moved by the movement of the movable post, allowing loading onto the cassette deck side.

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

FIG. 1 is a top view showing the structure of a cassette half according to a first embodiment of the present invention. In Fig. 1, 7 indicates the movable post position when the magnetic tape is stored, 8 indicates the magnetic tape position when the magnetic tape is stored, 9 indicates the movable post position when the magnetic tape is withdrawn, and 10 indicates the magnetic tape position when the magnetic tape is withdrawn. show.

When the magnetic tape is stored and stored, shape transfer does not occur by setting the movable post position at a position where the magnetic tape does not wrap around the post. The movable post moves linearly between 7 and 9, and its mechanism will be explained in detail.

Figure 2 & is A in Figure 1 when magnetic tape is stored and stored.
A' sectional view, Figure 3 shows A when the magnetic tape is pulled out.
'A sectional view, FIG. 3C is a BB/sectional view.

In FIG. 1, 11 is a lid part, 12 is a movable post,
13 is a slide groove, and 14 is a slide portion. Figure 1a
In this case, the lid part 11 and the slide part 14 hermetically seal the cassette half when the magnetic tape is stored. When pulling out the magnetic tape, the movable post 12 is moved linearly by opening the silirad section 11 from the outside and operating the slide section 14.

In this way, in the first embodiment of the present invention, by providing a movable post inside the cassette half that moves linearly to pull out the magnetic tape by external operation, shape transfer does not occur, and A cassette half according to a second embodiment of the present invention will be described below with reference to the drawings. FIG. 3 is a top view showing the structure of a cassette half according to a second embodiment of the present invention. In the figure, 16 is a rotating shaft of an arm that holds the movable post 16, 1e is a movable post, and 18 is an insertion pin inserted from the outside.

The slide portion 17 is moved linearly by the insertion bin 18,
The movable post 16 moves around the rotating shaft 16.

As described above, in the second embodiment of the present invention, a movable post is provided inside the cassette half, and the movable post is rotated about the rotation axis to draw out the magnetic tape when operated from the outside. When storing and storing, the wrapping angle of the magnetic tape is reduced to reduce shape transfer, and
The magnetic tape can be easily pulled out.

A third embodiment of the present invention will be described below with reference to the drawings. FIG. 4 is a top view showing the structure of a cassette half according to a third embodiment of the present invention.

19 is a fixed post, and 20 is a movable post. The difference from the second embodiment is that a fixed post 19 is additionally provided. The post diameter of the movable boss 20 must be made small in consideration of loading onto the cassette deck, but the fixed post 19 can have a large diameter if there is a base that fits inside the cassette half. The actual damage caused by shape transfer can be reduced compared to the example.

In the present invention, the terms fixed post and movable post refer to whether the position of the post is fixed or not relative to the cassette half, and the movable post may be a rotating post or a non-rotating post. good.

Furthermore, in the case of a non-rotating post, it is not necessary that the cross section of the post be circular at all, as long as the part that contacts the magnetic tape is rounded.

As described above, according to the cassette half of the embodiment of the present invention,
A movable post is provided inside the cassette half, and when the tape is stored and stored, the post is not in contact with the magnetic tape or is in contact with the magnetic tape at a small angle, and when the tape is used, the post can be operated from outside the cassette half. By performing the operation of drawing out the magnetic tape to the outside, shape transfer can be reduced.

Effects of the Invention As is clear from the above embodiments, the cassette half body is composed of a five-sided cassette half body and a lid part that can be opened and closed while covering the opening of the body. a post is provided, and the movable post is placed in a position not in contact with the magnetic tape when the magnetic tape is stored and stored;
By using a cassette half in which the magnetic tape is pulled out by an operation from outside the cassette half when the tape is used, it is possible to at least reduce shape transfer.

[Brief explanation of drawings]

FIG. 1 is a top view showing the structure of a cassette half according to the first embodiment of the present invention, FIG. 2 is a sectional view showing the structure of the first embodiment of the present invention, and FIG. FIG. 4 is a top view showing the structure of a cassette half according to the third embodiment of the present invention, and FIG. 6 is a top view showing the structure of a conventional cassette half. be. 1... Cassette half body, 2... Lid section, 3... Unwinding reel, 4...
Winding reel, 6...Magnetic tape, 6...
...Movable post, 7...Movable post position when magnetic tape is stored, 9...Movable post position when magnetic tape is pulled out. Name of agent: Patent attorney Shigetaka Awano TL or one person]
-Fig.

Claims (4)

[Claims] (1) Magnetic tape is wound on an unwinding reel and a take-up reel inside a case consisting of a cassette half main body consisting of five sides and a lid part that can be opened and closed while covering the opening of the main body. A movable post is provided inside the cassette half to guide the magnetic tape, and the movable post is in a position where it does not come into contact with the magnetic tape when the magnetic tape is stored and stored, and when the tape is used, there is no contact with the magnetic tape from outside the cassette half. A cassette half that can be operated to pull out a magnetic tape. (2) The magnetic tape is wound on an unwinding reel and a take-up reel inside a case consisting of a cassette half main body consisting of five sides and a lid part that can be opened and closed while covering the opening of the main body. A movable post for guiding the magnetic tape is provided inside the cassette half, and the movable post is located near the lid and approximately in the middle of the reel when the magnetic tape is stored, and when the tape is used, the movable post is located inside the cassette half. A cassette half whose magnetic tape is pulled out by external operation. (3) The cassette half according to claim 1 or 2, wherein the movable post is slidable by an operation outside the cassette half and moves linearly. (4) The cassette half according to claim 1 or 2, wherein the movable post is rotatable about a rotation axis by an operation outside the cassette half.