JPH04214278A - Cassette tape - Google Patents

Abstract

PURPOSE:To prevent the dropping of a tape and the plastic deformation of the wound tape by cutting the adjacent angle parts of the hub and reel stopper of the tape cassette to gentle flat surfaces. CONSTITUTION:The gentle flat surfaces 4a, 5a are formed at the adjacent angles of the hub 4 and the tap stopper 5. The magnetic tape 1 is held floated from the flat surfaces 4a and 5a when the tape 1 is wound around the hub 4 by detaining a leader tape 3 on the hub 4. Then, the magnetic tape 1 is prevented from dropping into the spacing between the hub 4 and the tape stopper 5 to form a bending part. Consequently, the wrinkling by the plastic deformation of the tape is prevented.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cassette tape used in VTRs and the like.

0002

2. Description of the Related Art FIG. 4 is a plan view of a hub of a conventional cassette tape, FIGS. 5A and 5B are a plan view and a side view of the tape, and FIG. 6 is an external view of the tape cassette. show. Reference numeral 1 denotes a magnetic tape, and a transparent leader tape 3 is connected to the end portion of the magnetic tape with an adhesive tape 2. Then, the end of the leader tape 3 is secured to the hub 4 with a tape stopper 5, and a magnetic tape is wound thereon, and the cassette shell 6, as shown in FIG.
It is housed within 7. This cassette shell 6 is provided with light-transmitting windows 12 and 13 on both sides.

Next, using a digital audio tape as an example, the operation of a cassette tape will be explained using FIG. A cassette 10 mounted on the tape drive mechanism 9 winds the magnetic tape 1 pulled out from the cassette 10 around a drum 11, and is set on a tape running path to enter a play state. On the other hand, transparent windows 12 and 1 provided on the side surface of the cassette shell 6
Photocouplers 14 and 15 are arranged at positions facing 3, and the light emitted from these photocouplers 14 and 15 is blocked by the magnetic tape 1 during play, but when the transparent leader tape at the end of the tape appears, Photo coupler 14,1
The light emitted from the player 5 passes through the leader tape and is detected by a light-receiving element (not shown) to complete the play.

0004

[Problems to be Solved by the Invention] Since the conventional cassette tape is constructed as described above, when winding the magnetic tape 1 around the hub 4, as shown in FIG. When the second layer is wrapped around the part that is secured to the hub 4 by the stopper 5, a portion of this tape falls into the gap between the hub 4 and the tape stopper 5 and forms the bent portion 16.
occurs. In this state, the tape wound over the bent portion 16 is further plastically deformed, causing so-called wrinkles. This phenomenon occurs because, as shown in FIG. 9, a step 19 is created at the end of the adhesive tape 2 that connects the magnetic tape 1 and the leader tape 3 due to the overlapping of the tapes. Wrinkles appear on the tape wrapped around the tape.

[0005] The above-mentioned wrinkles in the tape are particularly likely to occur when the tape is used in a high-temperature environment, and
It also occurs on tapes that have been left unused for long periods of time, even at room temperature. Even when a magnetic tape with wrinkles is run with tension applied to the outer circumference of the drum, the tape is not sufficiently tensioned and the close contact with the drum is impaired, which causes dropouts. This caused problems such as deterioration of recording characteristics and playback characteristics.

The present invention was made in order to eliminate the above-mentioned problems, and its purpose is to obtain a cassette tape that prevents the generation of wrinkles due to plastic deformation of the magnetic tape wound around the hub. do.

[0007]

[Means for solving the problem] Claim 1 of this invention
The described cassette tape has a perfect circular outer periphery by combining a tape stopper with a hub around which the magnetic tape in the tape cassette is wound, and a corner portion of the hub outer periphery where the hub and the tape stopper are adjacent to each other. It is characterized by having a gentle flat surface cut by cutting.

Further, in the cassette tape according to claim 2 of the present invention, in the hub of the tape reel on which the magnetic tape is wound, the hub surface located at the end of the adhesive tape connecting the magnetic tape and the leader tape is provided. It is characterized by having a gentle concave portion.

The cassette tape according to claim 3 of the present invention is characterized in that the terminal tape portion of the magnetic tape is a transparent portion on which no magnetic layer is formed, and this transparent portion is used as a leader tape.

0010

[Operation] In the cassette tape according to claim 1 of the present invention, since the adjacent angle between the hub and the tape stop is a gentle flat surface, the wound tape does not fall into the gap, so that the tape is plastically deformed. There are no wrinkles caused by this.

[0011] Furthermore, the cassette tape according to claim 2 comprises:
Since the end of the adhesive tape that connects the magnetic tape and leader tape is positioned in a gentle concave part formed on the hub surface, there is no difference in level caused by overlapping the tape, and there is no wrinkle caused by plastic deformation of the tape. There was no occurrence of

Furthermore, in the cassette tape according to claim 3, a transparent tape portion without a magnetic layer is formed at the end portion of a predetermined length of the magnetic tape, and this transparent tape portion is used as a leader tape. There is no need for adhesive tape to connect the two, and therefore, there is no difference in level when the tape is wound.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing the entire hub of a cassette tape according to the present invention, where 4 is a hub, and 5 is a tape fixing member that engages with this hub 4 and fixes a leader tape (not shown).

FIG. 2 is an enlarged view of the main parts of a hub and a tape fastener showing a first embodiment of the present invention, in which the adjacent angles of the hub 4 and the tape fastener 5 are formed to form gentle flat surfaces 4a and 5a. be. With this configuration, when the leader tape 3 is locked to the hub 4 and the magnetic tape 1 is wound around the hub 4, the magnetic tape 1 is lifted off the flat surfaces 4a and 5a, so that the magnetic tape 1 does not fall into the gap between the hub 4 and the tape fixing 5 and create a bent part 16 as in the conventional example shown in FIG. 8, and as a result, wrinkles do not occur due to plastic deformation of the tape. do not have.

FIG. 3 is an enlarged view of a main part of a hub showing a second embodiment of the present invention.
was formed. The magnetic tape 1 is attached to this concave portion 4b.
By winding the tape so that the end of the adhesive tape 2 and the leader tape 3 are positioned, the magnetic tape 3 is wound together with the end of the adhesive tape 2 in a state raised from the concave portion 4b, and as a result, the magnetic Unlike the conventional example shown in FIG. 9, the tape does not have a step 19, which eliminates the occurrence of wrinkles due to plastic deformation of the wound tape.

In yet another embodiment of the present invention, a predetermined length portion at the end of the magnetic tape is made into a transparent tape portion on which no magnetic layer is formed, and this transparent tape portion is used as a leader tape. No adhesive tape is needed to connect the leader tape to the magnetic tape, thus
No steps are created when the tape is wound, and no wrinkles occur due to plastic deformation of the tape. Here, the above-mentioned leader tape can be manufactured by chemically treating a predetermined length of the starting and ending ends of the magnetic tape to remove the magnetic layer containing the binder and exposing the transparent base film.

[0017] In addition to digital audio tapes, cassette tapes can be widely applied to VTRs, 8 mm videos, etc. that require high-density magnetic recording.

[0018]

[Effects of the Invention] As explained above, according to the present invention,
Since the adjacent corners of the hub and the reel stopper are cut into gentle flat surfaces, the tape does not fall into the gap between the hub and the tape stopper, and plastic deformation of the wound tape can be prevented. In addition, a gentle concave part is formed on the outer peripheral surface of the hub, and the end of the adhesive tape for tape connection is located in this concave part, so there is no difference in level in the wrapped tape, and the same process as above can be achieved. Plastic deformation of the tape can be eliminated. Further, by chemically treating the end portion of the magnetic tape to a transparent tape without a magnetic layer and using this transparent tape portion as a leader tape, the adhesive tape that causes the above-mentioned step difference is not required. Therefore, by providing the above-described means, it is possible to prevent the occurrence of dropouts due to plastic deformation of the tape, and to prevent deterioration of recording characteristics and playback characteristics. In addition, since it can be done with a simple configuration without adding any new parts, it can be provided at low cost.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a hub of a cassette tape according to an embodiment of the present invention.

FIG. 2 is an enlarged view of the main parts of the hub and tape attachment.

FIG. 3 is an enlarged view of the outer peripheral surface of the hub and main parts of the tape.

FIG. 4 is a plan view of a conventional hub.

FIG. 5 is a diagram of a magnetic tape and a leader tape.

FIG. 6 is an external view of the tape cassette.

FIG. 7 is a plan view of a conventional tape drive mechanism.

FIG. 8 is an enlarged view of main parts of a conventional hub and tape attachment.

FIG. 9 is an explanatory diagram showing plastic deformation of a tape on the outer peripheral surface of a conventional hub.

[Explanation of symbols]

1 Magnetic tape 2 Adhesive tape 3 Leader tape 4 Hub 4a Flat surface 4b Concave part 5　Tape fastening 5a Flat surface

Claims (3)

[Claims] Claim 1: By combining a tape stopper with a hub around which a magnetic tape is wound in a tape cassette, the outer periphery of the hub is made into a perfect circular shape, and the corner portion of the outer periphery of the hub where the hub and the tape stopper are adjacent to each other is A cassette tape characterized by having a gently flat surface cut out. 2. A cassette characterized in that, in a hub of a tape reel on which a magnetic tape is wound, a gentle concave portion is provided on the hub surface located at the end of an adhesive tape connecting the magnetic tape and the leader tape. tape. 3. A cassette tape characterized in that a terminal tape portion of the magnetic tape is a transparent portion on which no magnetic layer is formed, and this transparent portion is used as a leader tape.