JPS6166271A - Cassette tape for check of music interval detector - Google Patents

Abstract

PURPOSE:To keep the tape driving speed at a fixed level by setting the length of a magnetic tape for check of music interval detector at such value that gives no effect to the revolving radius decided by the radius of a large-diameter hub and the thickness of a magnetic tape. CONSTITUTION:A cassette half 5 is set to a cassette tape recorder, and this tape recorder is set under a reproduction state. Thus a magnetic tape 8 for check of music interval detector wound round a hub 6 is taken up by a hub 7 at a fixed speed. Then the cassette tape recorder is set under a fast forward mode. Thus the tape driving speed is increased up to about 20 times as high as that of a reproduction mode although the shift of the tape 8 is equal to that of a reproduction mode. When the tape recorder is set under a rewind mode, the tape 8 is shifted to the hub 6 from the hub 7. Then the driving speed of the tape 8 is increased up to about 20 times as high as that of a reproduction mode which is equal to the speed of a fast forward mode.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF THE INVENTION The present invention relates to a cassette tape for testing a track interval detection device that reduces changes in tape running speed.

Conventional configuration and its problems In recent years, in order to enhance the editing functions of tape recorders, song interval detection devices that perform song selection and song cue functions have come into widespread use. Since the detection time of the song interval detection device is set by taking into consideration not only variations in the electric circuit but also variations in the running system, cassette tapes for testing the song gap detection device have been proposed in the past.

A conventional cassette tape for testing a track interval detection device will be described below.

FIG. 1 is a diagram showing the shape of a conventional cassette tape for testing a track distance detection device, in which 1 is a cassette nof, 2 and 3 are tapes fixed to the cassette half, and 4 is a tape wound around the hub. This is a magnetic tape for testing a track interval detection device.

The operation of the cassette tape for testing the song interval detection device constructed as above will be described below.

First, cassette half 1 is attached to a cassette tape recorder. Next, when the cassette tape recorder is put into playback mode, the magnetic tape 4 for testing the song interval detection device is wound around the hub 2.
runs and is wound onto knob 3. When the cassette tape recorder is put into the fast forward state, the movement of the magnetic tape 4 for testing the inter-track detection device is the same as in the playback state, but the moving speed is several tens of times faster. When the cassette tape recorder is placed in the rewinding state, the magnetic tape 4 for testing the song interval detection device wound around the hub 3 moves to the hub 2, and the moving speed is the same as in the fast forwarding state.

However, in the above conventional configuration, in order to lengthen the playback time of the cassette tape for testing the track distance detection device, the hub 2
, 3 was made smaller and the length of the magnetic tape for testing the track distance detection device was made longer, so the distance from the center of the hub to the outermost magnetic tape was increased at the beginning and end of the winding. This has caused a problem in that a constant tape running speed cannot be maintained, especially during fast forwarding and rewinding.

For example, the tape running speed in the fast-forward state changes approximately ten times as much as in the playback state at the beginning of the winding, and approximately thirty times as much at the end of the winding. Therefore, as a cassette tape for testing a track distance detection device, which requires a strict tape running speed, the above-mentioned conventional tape does not fully satisfy the characteristics.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional problems, and an object thereof is to provide a cassette tape for testing a track interval detection device that has a simple structure and can keep the tape running speed constant during high-speed running. do.

Structure of the Invention The present invention provides a track interval detection device testing device comprising a cassette half, a large diameter hub fixed to the cassette half, and a magnetic tape for testing the track distance detection device wound around the large diameter hub. If it is a cassette tape, the radius of the large diameter hub is approximately the distance from the center of the hub to the outermost magnetic tape when half the length of the magnetic tape is wound with a normal cassette tape. By setting the length of the magnetic tape for testing the track distance detection device to a length that does not affect the rotation radius, which is composed of the radius of the large-diameter hub and the thickness of the magnetic tape, high-speed This allows the tape running speed to be kept approximately constant during running.

DESCRIPTION OF EMBODIMENTS FIG. 2 shows the shape of a cassette tape for testing a track interval detection device in an embodiment of the present invention. In FIG. The large-diameter hub 8 is a magnetic tape for testing the track distance detection device, which is wound around the hub 6.7.

Conventional song interval detection device for testing sumo wrestler tapes Song spacing detection device for testing magnetic tape In order to match the tape running speed near the middle of the length, the radius of the large diameter hub is set to half of the magnetic tape with a regular cassette tape. The length of the magnetic tape for testing the track distance detection device is approximately the same as the distance from the center of the hub to the outermost magnetic tape when wound. Set the length so that it does not affect the rotation radius, which is composed of the radius and the thickness of the magnetic tape. For example, the diameter of the large-diameter hub is 3.7 cm, and the length of the magnetic tape for testing the track distance detection device is set to be 3 minutes long in the playback state, that is, about 860 crn.

The operation of the cassette tape for testing the song interval detection device of this embodiment constructed as described above will be described below. First, the cassette half 6 is attached to the cassette tape recorder. Next, when the cassette tape recorder is put into a playback state, the magnetic tape 8 for testing the song interval detection device wound around the hub 6 is wound around the hub 7 at a constant speed. Next, when the cassette tape recorder is put into the fast-forward state, the movement of the magnetic tape 8 for testing the inter-track detection device is the same as in the playback state, but the running speed is about twenty times that of the playback state. Furthermore, when the cassette tape recorder is placed in the rewinding state, the magnetic tape 8 for testing the song interval detection device wound around the hub 7 moves to the hub 6, and its traveling speed is approximately 20° during playback, which is the same as in the fast forward state. It's double.

FIG. 3 shows a graph of the winding time and tape running speed in a fast forward state. Confirm the tape running speed by checking the change in tape frequency. It can be seen from FIG. 3 that there is almost no change in tape running speed between the beginning and end of tape winding.

As described above, according to this embodiment, when a normal cassette tape is wound around half the length of the magnetic tape around the radius of the large-diameter hub 6°7, the magnetic tape is wound outward from the center of the hub. The length should be approximately the same as the distance to the magnetic tape, and the length of the magnetic tape 8 for testing the track distance detection device should be a length that does not affect the rotation radius, which is composed of the radius of the large diameter hub and the thickness of the magnetic tape. By doing so, the tape running speed at the beginning, middle, and end of the winding of the magnetic tape 8 for testing the track distance detection device can be kept approximately constant.

Effects of the Invention The present invention makes the radius of a large-diameter hub approximately equal to the distance from the center of the hub to the outermost magnetic tape when half the length of the magnetic tape is wound with a normal cassette tape. To make the length of the magnetic tape sufficiently large to the same length, and to shorten the length of the magnetic tape for testing the track distance detection device to a length that does not affect the rotation radius composed of the radius of the large diameter hub and the thickness of the magnetic tape. Accordingly, it is possible to realize an excellent cassette tape for testing a track distance detection device, which can keep the tape running speed substantially constant.

[Brief explanation of the drawing]

FIG. 1 is a top view of a conventional cassette tape for testing a song interval detection device, FIG. 2 is a top view of a cassette tape for testing a song gap detection device according to an embodiment of the present invention, and FIG. 3 is a top view of a cassette tape for testing a song gap detection device in an embodiment of the present invention. It is a running speed diagram. 5...Cassette half, 6,7...Large diameter hub, 8...Magnetic tape for testing the track interval detection device. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Arrival in port

Claims (1)

[Claims] A large diameter hub with a radius that is approximately the same distance from the center of the hub to the outermost magnetic tape when half the length of the magnetic tape is wound with a regular cassette tape. and a magnetic tape for testing the magnetic tape for a magnetic tape wound with a length that does not affect the radius of rotation, which is composed of the radius of the large-diameter hub and the thickness of the magnetic tape. Cassette tape for detection device testing.