JPS63288487A - Tape cassette - Google Patents

Abstract

PURPOSE:To edit a tape highly accurately by providing an index and graduation in a hub i.e. the rotational part of a tape cassette and the stationary part of the same, and reading a specific position on a magnetic tape as a value. CONSTITUTION:The reproduction switch 13 of a cassette deck 14 is turned on to rewind a magnetic tape 1, and the reproduction operation is achieved, then a reproducing head 11 is stopped at the position of the end of announcement signals 9. At this time, the index 4 reads the value indicated in the graduation 5. In such a state, the magnetic tape 1 is rewound toward the hub on the feeding side for a few turns, the reproduction switch 13 is turned off, then an erasing switch 12 is turned on to erase by an erasing head 10. With the head 10 being in the erasing state, the tape is run for the length of the same number of turnings that the hub 3 on the feeding side rewound, and stopped at the time when the mark 4 is made coincident with the formerly read value. In such a way, only the announcement signals 9 can be accurately erased, hence the recording-content can be accurately edited.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a tape cassette which houses a magnetic tape and a hub around which the magnetic tape is wound, and which allows at least the upper or lower surface of the hub to be seen through.

2. Description of the Related Art An example of a tape cassette of this type provided with indicators and scales is a torque meter, but the indicators and scales are not used to recognize a predetermined position on a magnetic tape.

Problems to be Solved by the Invention However, conventional tape cassettes did not have a mechanism to display a predetermined position on the magnetic tape, so in order to edit the recorded content, it was necessary to remove the tape from the cassette deck, etc. With this method, repeating operations such as rewinding and playing back creates an error between the tape counter value and the position on the magnetic tape, making it difficult to perform accurate editing. It had drawbacks.

The present invention is intended to solve these conventional problems, and aims to provide a tape cassette in which recorded contents can be edited with high precision.

Means for Solving the Problems To achieve this objective, the tape cassette of the present invention comprises:
Indices and scales are provided on the hub, which is a rotating part, and a fixed part, through which at least the upper or lower surface of the hub can be seen, to indicate a predetermined position on the magnetic tape.

Function: The tape cassette of the present invention has indicators and scales provided on the hub, which is the rotating part, and the fixed part, so that a predetermined position on the magnetic tape can be indicated by the value on the scale.

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

FIG. 1 shows a plan view of a tape cassette in one embodiment of the present invention. In FIG. 1, 3 is a supply side hub, and 4 is an index provided on the upper surface of the hub. Reference numeral 6 denotes a scale provided on the sheet, and the indicator 4 indicates a corresponding value on the scale. In this embodiment, the indicators 4 are provided at three locations in an angular range of 120 degrees, and the scales 6 are also provided in an angular range of 120 degrees. As a result, no matter where the rotation angle of the supply hub 3 is, at least one indicator 4 is within the range of the scale 5 and indicates its value. Reference numeral 2 is a cassette half made of transparent material, so that the positional relationship between the index 4 and the scale 6 can be seen.

FIG. 2 is a sectional view taken along line aa' in FIGS. 1 and 4. FIG.

The operation of the tape cassette constructed as described above will be described below with reference to FIG.

FIG. 3 M to D show operations during tape editing, in which a music signal 8 and an announcement signal 9 are placed on a magnetic tape 1.
is being recorded. To edit the recorded content by erasing only the announcement signal e, turn on the playback switch 13 of the cassette deck 14, rewind the magnetic tape 1, perform playback, etc., and erase the announcement signal as shown in Figure 3B. 9 is stopped at the position of the playback head 11. At this time, read which value on the scale 5 the index 4 indicates. From this state, the magnetic tape 1 is rewound to the supply hub 3 several times, and the third
Turn off the playback switch 13 and erase switch 1 as shown in Figure C.
2 and perform erasing with the erasing head 1o. In the erased state, the supply side hub 3 rotates the same number of times as the number of times it was rewound,
Stop when indicator 4 shows the value read in FIG. 3B. As a result, only the announcement signal 9 can be accurately erased from the human condition shown in FIG.

Other embodiments of the present invention will be described below with reference to the drawings.

FIG. 4 is a plan view of a tape cassette showing another embodiment of the present invention. In the figure, 1 is a magnetic tape, 2 is a cassette half, and the above structure is the same as that shown in FIG. The difference from the configuration in Figure 1 is that indicator 4
is provided on the sheet, and a scale 5 is provided on the supply side hub 3.

The operation of the tape cassette constructed as described above will be described below. The only difference between this embodiment and the first embodiment is that the index 4 is fixed by providing it on the sheet 6, and the value on the scale 6 is read based on this index 4. The other operations during editing are the same as in the first embodiment.

As described above, by making it possible to read the value on the scale 5 based on the fixed index 4, this tape cassette can be used even in a cassette deck where the visible range of the tape cassette is narrow.

In the first embodiment, the scale 6 is provided on the sheet, but it may also be provided on the cassette half 2.

Similarly, in other embodiments, the indicators 4 are provided on the sheet 6, but they may also be provided on the cassette half 2.

Further, in the first and other embodiments, the indicator 4 and the scale 6 are provided on the supply side hub 3, but they may be provided on the take-up side hub 7.

Effects of the Invention As described above, the present invention improves accuracy by providing indicators and scales on the hub, which is the rotating part, and the fixed part of the tape cassette, making it possible to read a predetermined position on the magnetic tape as a value. You can perform high quality editing.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a tape cassette according to the first embodiment of the present invention, FIG. 2 is a sectional view taken along line a--' in FIG.
Figures 1-D are explanatory diagrams of editing operations in the first embodiment, and FIG. 4 is a plan view of another embodiment. 1... Magnetic tape, 2... Cassette half, 3... Supply side hub, 4... Index, 5...
...Scale, 6...Sheet. Name of agent: Patent attorney Toshio Nakao and 1 other person/
-a ki tea? --Ka ℃-7 To half 3-4g String N rule hub Otsu Sheet Figure 2

Claims (4)

[Claims] (1) A hub around which a magnetic tape is wound, an indicator provided at one or more locations facing the outer periphery of at least the upper or lower surface of the hub, and an indicator that faces the indicator and divides the circumference of the hub at predetermined intervals. a sheet made of a transparent material provided with a scale, the magnetic tape, the hub, and the sheet;
A tape comprising at least the indicator and a cassette half through which the scale can be seen, such that a predetermined position on the magnetic tape can be recognized by the value of the scale indicated by the indicator. cassette. (2) The tape cassette according to claim 1, wherein the index is provided on the sheet and the scale is provided on the hub. (3) The tape cassette according to claim 2, characterized in that an indicator is provided on the cassette half. (4) The tape cassette according to claim 1, characterized in that a scale is provided on the cassette half.