JPS6336534Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to tape cassettes, and more particularly to self-erasing tape cassettes.

BACKGROUND ART A Phillips type tape cassette (tape cartridge), in which a pair of reels are housed in a case and the tape is moved back and forth, is widely used in recording and reproducing devices such as tape recorders, tape players, and VTRs. One of the advantages of this type of tape cassette was that it was generally possible to play back the same recording over and over again, but now that the amount of information has become excessive, it has become increasingly necessary to erase recorded recordings immediately after playing them. .

In other words, for example, records that have a strong temporary nature such as Valentine's Day, birthdays, and other messages, messages and messages that require secrecy, or records that make a particularly strong impression or need to be protected from plagiarism, such as new song introductions and quiz questions, etc. , it would be advantageous if the recording could be erased immediately after playback.

However, with conventional tape cassettes of this type, in order to erase the recording after playback, it is necessary to load the tape cassette into the playback device each time, rewind and record the tape, and then demagnetize it with the erase head. There was a problem that the deletion operation took time and effort.

As a countermeasure to this problem, Japanese Utility Model Publication No. 1294/1983 proposes a degaussing member having a bar-shaped magnet with a flanged knob that can be inserted into and removed from a tape cassette. However, with this prior art, it is necessary to prepare a degaussing member as a separate part from each tape cassette, and since the degaussing member is small, there is a risk of losing it or damaging the tape by inserting it in the wrong direction. The problem was that it protruded largely from the surface of the tape cassette, creating an obstruction and requiring the use of a special playback device.

The present invention aims to solve the above-mentioned drawbacks of the conventional tape cassette and to provide a tape cassette that can easily erase recordings such as audio and images at the same time as they are played using a normal playback device. The feature is that in a tape cassette that stores magnetic tape wound on a pair of reels inside the cassette case, a magnet piece is built in and held in the part of the cassette case that is closer to the take-up reel than the recording/playback head insertion hole. The structure is such that the magnet piece is moved and pressed toward the magnetic tape through a hole provided in the rear case wall.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a cassette case, which is constructed into a box shape with upper and lower cassette halves 2 and 3. A pair of reels 4 and 5 are rotatably housed in the cassette case 1, and a magnetic tape 7 whose ends are fixed is wound around the reels 4 and 5. Numerals 8, 9, and 10 are insertion holes formed in the front side of the cassette case for inserting the erasing head A, recording/playback head B (playback head in the case of a tape player), and pinch roller C, respectively. guide roller, 12,1
2 is a guide pin formed between the guide rollers 11, 11 and the reels 4, 5. 13 is a tape pad provided inside the recording/playback head insertion hole 9;
4 is a magnetic shielding plate, and magnetic tape 7 is a guide pin 1.
2, 12, and are guided by guide rollers 11, 11, and can run from one reel to the other reel in contact with the tape pad 13 on the inside of each insertion hole 7, 8, 9.

Such a structure is similar to that of a conventional tape cassette, but the present invention allows the magnetic tape 7 to be inserted at any position after passing through the recording/reproducing head B, that is, between the recording/reproducing head insertion hole 9 and the take-up reel 4 or 5. A magnet piece 14 is attached near the magnetic tape running path, and this magnet piece 14 is brought into contact with the magnetic surface of the magnetic tape.

In FIGS. 2 and 3, the magnet piece 14 is fixed to the tape running path, but with this structure, the recorded content is inevitably erased as the tape runs. Therefore, the present invention has a mechanism that presses and moves the magnet piece 14 so that it comes into contact with the magnetic tape 7 when necessary, while keeping the magnet piece 14 inside the tape cassette. An example is shown.

In the embodiment shown in FIG. 4, a locking part 18 and a through hole 19 are formed in a part of the wall 17 of the cassette case 1, and a magnet piece or a support body with the magnet piece attached to the front part is attached in the axial direction of the through hole 19. 20 is attached, and the magnet piece 14 is held by the locking part 18 under normal conditions.When necessary, the operation piece 23 is inserted through the through hole 19 as shown in FIG. 5, and the magnet piece 14 or the support body 20 is pressed. By doing so, the magnet piece 14 is moved toward the tape running path and brought into contact with the magnetic tape 7.

In FIG. 6, a magnet piece 14 supported by an elastic piece 21 is arranged inside a cassette case, and a hole 22 is formed in the wall 17 of the cassette case, so that the magnet piece 14 is normally separated from the magnetic tape 7. When necessary, as shown in FIG. 7, a pin-shaped operating piece 23' is inserted through the hole 22 to displace the elastic piece 21 and bring the magnet piece 14 into contact with the magnetic tape 7. In addition, instead of this, the magnet piece 14 or the elastic piece 21 is forcibly pulled back to the wall side by a locking part, etc., and when necessary, the lock is released through the hole 22, and the magnet piece 14 is pulled back by the restoring action of the elastic piece 21. magnetic tape 7
It may be made to contact.

Since the tape cassette according to the present invention has the above-described configuration, when the cassette case 1 containing the magnetic tape 7 containing audio and images is attached to a playback device (not shown) and a playback operation is performed, the magnetic The tape 7 passes from the supply reel 4, passes through the guide pin 12 and the guide roller 11, reaches the front side of the cassette case, is played back by the playback head B, passes through the guide roller 11 and the guide pin 12, and is wound onto the take-up reel 5. At this time, in the present invention, since the magnet piece 14 is held in advance in the tape running path between the playback head B and the take-up reel 5 so as to face the magnetic tape 7, the wall hole 12 behind the magnet piece 14
By inserting the operating pieces 23 and 23' from the magnetic tape 9 and 22, the magnet piece 14 comes into close contact with the magnetic tape 7. As a result, the tracks on the magnetic tape 7 are transferred to the playback head B.
After being reproduced by contact with the track, the track is magnetized to a saturation point by the magnetic force of the magnet piece 14 in contact with the track, and no change in magnetism is caused. Therefore, after the recording on the magnetic tape is reproduced, it is immediately and continuously erased within the cassette case, and in this state it is wound onto the take-up reel 5.

Then, after playing and erasing the tracks on one side, if the cassette tape is reversed and the tracks on the other side are played back, automatic erasure is performed in the same way as above. Magnet piece 1
4 is built in the tape cassette in advance, and comes into contact with the magnetic tape 7 when pressed by the operation piece, so that no obstacles protrude outside the tape cassette, so that a normal playback device can be used as is.

According to the present invention described above, in a tape cassette that stores magnetic tape wound on a pair of reels in the cassette case, a magnet piece is built in and held in a part of the cassette case that is closer to the take-up reel than the recording/playback head insertion hole. Since the magnet piece is moved and pressed toward the magnetic tape through a hole provided in the back case wall, there is no need to prepare a separate demagnetizing member for each tape cassette, and there is no need to prepare a separate demagnetizing member for each tape cassette. You don't have to worry about damaging the tape by inserting it in the wrong direction or inserting it in the wrong direction. Just insert the control piece and the recorded recording can be reliably automatically erased and wound almost simultaneously with playback, making it perfect for Valentine's Day. It is suitable for use in cases where it is necessary to strengthen an impression or prevent plagiarism, such as temporary records with strong colors, quizzes, and new song introductions.Furthermore, a magnetic piece is pre-built into the tape cassette. Since it is only necessary to hold the tape and move it, excellent effects such as no obstacles protruding from the surface of the tape cassette and no need for a special playback device can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a tape cassette to which the present invention is applied, FIG. 2 is a plan view of the lower half thereof, FIG. 3 is a sectional view taken along the line of FIG. FIG. 7 is a partial sectional view showing another embodiment of the present invention. 1...Cassette case, 4, 5...Reel, 7
...Magnetic tape, 9...Playback head insertion hole, 14
...Magnet piece.

Claims (1)

[Scope of utility model registration request] In a tape cassette that stores magnetic tape wound on a pair of reels in a cassette case,
A piece of magnet is built-in and held in a part of the cassette case closer to the take-up reel than the recording/playback head insertion hole, and the piece of magnet is moved and pressed toward the magnetic tape through a hole provided in the case wall at the back. A self-erasing tape cassette characterized by: