JPH0110796Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a test tape cassette, and more particularly, an object of the present invention is to provide a test tape cassette in which the amount of winding of a test signal-containing tape is reduced.

Generally, in the manufacturing process of a cassette tape recorder, tests for wow and flutter and tape speed are performed by actually driving and running the tape using a test tape cassette on which predetermined test signals have been recorded in advance.

A conventional test tape cassette of this type has a structure similar to a general tape cassette, as shown in FIG. That is, a pair of reel hubs 1
a and 1b have the same diameter as the diameter D of the reel hub of a general tape cassette, and the recorded test tape 2
is fixed at both ends to the reel hubs 1a, 1b and wound around each reel hub 1a, 1b. The length of this test tape 2 is the same as that of a general tape cassette. With most of the test tape 2 wound around the reel hub 1a,
The diameter of the tape winding body 2a is d ₁ , and the diameter of the tape winding body 2a is d 1 .
The diameter of b is _d2 .

Here, the tape back tension that affects wow and flutter and tape speed is determined by It is weakest at the end of tape winding (the diameter of the tape winding on the tape winding side is large and the diameter of the tape winding on the tape pull-out side is small). For this reason, in practice, the above-mentioned test is usually performed on the two states of the tape winding start and the tape winding end, and not on the intermediate state. Furthermore, if you turn the cassette over after testing at the beginning of tape winding, the state at the end of tape winding can be obtained, so you can test the state at the end of tape winding in this way, and run the entire tape in one direction. That is not normally done.

That is, in the test, first, a cassette is mounted in the tape winding mode shown in Fig. 1, the tape is run in the direction of arrow A, and measurements are taken at the beginning of tape winding, and then the cassette is reversed and mounted. This is done by running the tape again against the cassette in the direction of arrow B (the running direction of the tape does not change on the cassette tape recorder) and measuring at the end of the tape winding. Therefore, the tape that is actually used for testing is only 1/3 to 1/4 of the total tape length from the beginning of tape winding, and the remaining tape portion is not used for testing.

Therefore, the present invention cuts the above-mentioned tape length portion that is not actually used, and reduces the length of the tape to be wound to a fraction of the conventional tape length.
It is an object of the present invention to provide a test tape cassette configured so that the above test can be carried out without any trouble.

FIG. 2 shows an embodiment of the test tape cassette 3 according to the present invention. In the figure, the same components as those shown in FIG. 1 are given the same reference numerals.

Reference numeral 4 denotes a large diameter reel hub, which has a predetermined diameter D ₁ that is larger than the diameter D of the other conventional reel hub 1b and smaller than the diameter d ₁ of the supply side tape at the time of starting tape winding. It is provided in place of the reel hub 1a.

The test tape _2-1 has both ends fixed to the reel hubs 4 and 1b and is wound around each reel hub 4 and 1b, forming tape windings 2a _-1 and 2b _-1 . The diameter of each tape winding body 2 _a-1 and 2 _b-1 is the same as that of the tape winding body 2 a of the conventional tape cassette described above.
and the diameters d ₁ and d ₂ of 2b. As a result, the test tape 2 _-1 wound around the reel hub 4
Since only the length required for the test is required, the amount of test tape 2 required is 1/4 to 1/3 of the amount of test tape 2 wound around the reel hub 1a in a conventional tape cassette.

In addition, the diameters d _{1 and d 2 of each tape winding body 2 a- 1} and 2 _{b- 1}
is the tape winding body 2 in a conventional tape cassette.
Since the diameters of the tapes a and 2b are made equal to each other, the size of the tape tension during tape running is the same as in the conventional case.

To test for wow/flatter and tape speed, first, test tape cassette 3 is installed in the state shown in Fig. 2, test tape _2-1 is driven and run in the direction of arrow A, and the test is performed at the beginning of tape winding. Do this. Next, the tape cassette is reversed and mounted again, and the test tape _2-1 is driven and run in the direction of arrow B relative to the cassette, and a test is performed at the end of tape winding.

As described above, according to the test tape cassette of the present invention, both ends are fixed to a pair of reel hubs, and the test tape is wound and stored around the reel hubs, and the cassette tape is loaded into a cassette tape recorder. In a test tape cassette used for testing the tape running characteristics of a recorder, the length of the test tape is the length required for the test, and the diameter of one of the pair of reel hubs is the same as that of a general tape cassette reel hub. The diameter of the other reel hub is the same as that of the other reel hub, and the diameter of the tape roll when the test tape of the length required for the above test is completely wound is the maximum diameter of the tape roll in a general tape cassette. Since the test tape cassette has a structure determined to be equal to the outer diameter, it is possible to form a tape wound body with a predetermined outer diameter by reducing the amount of test tape wound around the other reel hub. , it is possible to measure wow, flutter, tape speed, etc. using a test tape with a shorter length than before and with the same tape winding diameter as in the conventional case, reducing the amount of tape used. It is possible to manufacture tape cassettes used for testing at low cost, and since the length of the test tape is the length required for the test, there is no possibility that the test tape will reach the end in the middle of the test and the test cannot be performed. It has the advantage that no inconvenience occurs and tests can be performed without any problems.

[Brief explanation of the drawing]

FIG. 1 is a diagram schematically showing an example of a conventional test tape cassette, and FIG. 2 is a diagram schematically showing an embodiment of the test tape cassette according to the present invention. 1b...Reel hub, 2 _-1 ...Test tape,
2 _a-1 , 2 _b-1 ... Tape winding body, 3... Test tape cassette, 4... Large diameter reel hub.

Claims (1)

[Scope of utility model registration request] Both ends are fixed to a pair of reel hubs, and the test tape is wound around the reel hubs and stored,
In a test tape cassette that is attached to a cassette tape recorder and used for testing the tape running characteristics of the cassette tape recorder, the length of the test tape is set to the length necessary for the test,
In addition, when the diameter of one of the pair of reel hubs is the same as that of the reel hub of a general tape cassette, and the diameter of the other reel hub is the same as that of the reel hub, when the test tape of the length required for the above test is completely wound around it. A test tape cassette configured such that the diameter of the tape winding body is equal to the maximum diameter of the tape winding body in a general tape cassette.