JPH08310735A - Tape winding structure - Google Patents

Abstract

PURPOSE: To suppress the occurrence of 'pressing under bedding' caused by the winding fastening force of a tape by integrally providing cushioning materials covering the whole outer periphery of a tape winding shaft, and forming the cushioning materials with rubber or a plastic having a specific surface hardness. CONSTITUTION: A tape reel 7 is constituted of a reel member 10 integrally formed with a hub 8 and a lower flange 9 and an upper flange 11 fixed on the opposite side to the lower flange 9. The hub 8 is constituted of an inside hub section 12 and an outside hub section 13 concentrically arranged on a cylinder. A clamp piece 18 is coupled with a clamp recess 17 formed on the outer periphery of the hub 8. Cushioning materials 23, 24 are connected on the outer periphery of the outside hub section 13 and the outer periphery of the clamp piece 18 respectively. Rubber or a plastic having the surface hardness of JIS hardness 30-50 is used for the cushioning materials 23, 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to tapes used in tape cassettes and open reels of video cassette recorders (hereinafter referred to as "VCR") and digital audio tape recorders (hereinafter referred to as "DAT"). More particularly, the present invention relates to a tape winding structure for preventing a tape from being adversely affected by a step generated at a connecting portion between a hub and a tape, a shape defect during hub molding, or the like.

[0002]

2. Description of the Related Art Conventionally, a tape reel generally used in a VCR or the like has a cylindrical hub around which a magnetic tape is wound, a disc-shaped lower flange integrally formed with the hub, and a lower hub. A disk-shaped upper flange fixed to the other end of the hub so as to face the flange, and a clamp piece fitted in a clamp recess provided in a part of the outer circumference of the hub and having a surface forming a part of the outer peripheral surface of the hub. It consists of Two tape reels having such a structure are used for one tape cassette, and each tape reel is attached to both ends of one magnetic tape.

Trailer tapes are connected to both ends of the magnetic tape via splicing tapes. By fixing the trailer tapes to the hubs, the magnetic tapes are stretched between two tape reels. Has been done. As shown in FIG. 7, the tip end of the trailer tape is inserted into the clamp recess 2 of the hub 1. By fitting the clamp piece 3 into the clamp recess 2, the trailer tape T is attached to the hub 1. It is fixed. The trailer tape T is wound around the outer peripheral surface of the hub 1 for about 2 to 3 times, and the magnetic tape M is wound on it.

[0004]

However, in the conventional tape winding structure for a tape reel as described above, the entire tape reel including the hub 1 is made of a relatively hard material such as polyacetal (POM). It is made of plastic and has a structure in which the trailer tape T is engaged and fixed in the clamp recess 2 of the hub 1 by the clamp piece 3. Therefore, when the magnetic tape M is wound on the trailer tape T, the magnetic tape M As a result of the winding tightening, a gap 4 and a step 5 made of the magnetic tape M are formed on both sides of the clamp piece 3. As a result, the step portion 5 and the gap 4 of the magnetic tape M are
A distorted pattern called "sleeping" is formed on the portion 6 overlying. The "sleeping" of this magnetic tape M appears largely inside the tape, but in this way the magnetic tape M
If "sleeping" is possible, the recording pattern cannot be read normally during reproduction, which causes a problem of reproduction failure.

In order to solve such problems and reduce the damage to the magnetic tape M caused by "sleeping", various countermeasures have been taken in the past, for example. The first is to improve the accuracy of the coaxiality between the inner and outer hub portions of the hub 1, and the second is to devise the shape of the tape fixing portion.

However, in these countermeasures, high processing accuracy is required to obtain the coaxiality between the inner and outer hub portions, which is uneconomical because of an increase in yield and the like, and particularly, recent digital recording. In the magnetic tape used in the method, there is a problem that the deterioration of the shape of the recording pattern is not sufficiently prevented.

Further, a countermeasure for reducing the hardness of the tape reel as a whole can be considered, but the hardness of the reel as a whole is reduced to the extent that the gap 4 or the step 5 does not adversely affect the tape (for example, JIS. When the hardness is 50 or less), the durability becomes insufficient in the process of assembling into a cassette tape or when actually used in a VCR, and problems such as a large number of dropouts occur.

The present invention has been made in view of such conventional problems, and by winding a tape around a tape winding shaft via a cushioning material, "sleeping" due to the tightening force of the tape can be prevented. An object of the present invention is to provide a tape winding structure capable of suppressing the occurrence of the damage and reducing the damage given to the tape.

[0009]

In order to solve the above-mentioned problems and the like and to achieve the above-mentioned object, the present invention covers the entire outer peripheral surface of the tape winding shaft with a cylindrical tape winding shaft. As shown in the figure above, the cushioning material is integrally provided, the roundness of the outer peripheral surface of the tape winding shaft is 70 μm or less, and the cushioning material is a rubber or a plastic whose surface hardness is JIS hardness 50 or less 30 or more. The feature is that the tape is wound from.

Further, in the tape winding structure of the present invention, a trailer tape having one end wound one or more times around the cylindrical tape winding shaft and the other end connected to the tape is formed by superposing two or more members. It is characterized by having a structure of two or more layers, arranging a cushioning material on at least one layer, and winding a tape over the cushioning material.

Further, in the tape winding structure of the present invention, it is preferable that the cushioning material arranged on at least one layer of the trailer tape is a rubber or a plastic having a surface hardness of JIS hardness 50 or less and 30 or more.

[0012]

The present invention has the above-mentioned configuration,
When the tape is taken up on the tape take-up shaft, the cushioning material elastically deforms against the tightening force of the tape, and the elastic deformation of this cushioning material absorbs the gap between the tape step and both sides of the clamp piece, and the surface becomes flat. Since the tape is smoothed, the tape can be smoothly wound around the tape winding shaft, and it is possible to suppress the occurrence of “sleeping” due to the stepped portion or the gap in the tape.

Further, when the tape is wound around the tape winding shaft, since the trailer tape has a structure of two or more layers and the cushioning material is arranged in at least one layer, elastic deformation of the cushioning material causes a step portion or a clamp of the tape. Since the gaps on both sides are absorbed and the surface is flattened, the tape can be smoothly wound around the tape winding shaft, and "sleeping" caused by stepped portions or gaps can occur on the tape. Can be suppressed.

Further, when the cushioning material is a rubber or a plastic having a surface hardness of JIS 50 or less and 30 or more, a trailer tape which can suppress the occurrence of "sleeping" due to the tightening of the tape and reduce the tape damage. It can be manufactured easily and inexpensively.

[0015]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3 show a first embodiment of the present invention. FIG. 1 is a vertical sectional view of a tape reel used in a VCR or the like, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. It is a principal part explanatory view which shows the state which wound the tape on the hub. 4 and 5 show a second embodiment of the present invention. FIG. 4 is a perspective view showing a state in which a trailer tape is fixed to a tape reel, and FIG. 5 is a joined state of a trailer tape and a magnetic tape. FIG. Further, FIG. 6 is a diagram for explaining the width variation of the tape.

As shown in FIGS. 1 to 3, the reel 7 for tape according to the first embodiment faces a reel member 10 in which a hub 8 and a lower flange 9 are integrally formed, and a lower flange 9. It is composed of a lower flange 9 of the hub 8 and an upper flange 11 which is detachably (or integrally) fixed to the opposite side. Both the reel member 10 and the upper flange 11 are made of plastic (for example, polyacetal (POM), acrylonitrile-butadiene-styrene resin (ABS resin), etc.), and usually two tape reels 7 are provided in one tape cassette. Is used.

The hub 8 of the tape reel 7 has a cylindrical inner hub portion 12 and an outer hub portion 13 which are concentrically arranged.
And a plurality of radially provided rib portions 14 that connect the inner hub portion 12 and the outer hub portion 13 in the radial direction. Further, on the inner peripheral surface of the inner hub portion 12, a drive rib 15 for rotationally driving the tape reel 7 is provided.
Are provided at equal intervals. A plurality of drive teeth 16 for intermittently rotating the tape reel 7 are provided on the outer peripheral edge of the lower flange 9 at equal intervals.

Further, the outer hub portion 13 is provided on the outer periphery of the hub 8.
The clamp recess 17 is formed by notching a part of the. A clamp piece 18 whose detachable outer surface is continuous with the outer peripheral surface of the outer hub portion 13 and forms a part of the outer peripheral surface of the hub 8 is detachably fitted and fixed in the clamp concave portion 17.
Further, in the clamp recess 17, a pair of inner hub protrusions 20 provided on the outer periphery of the inner hub portion 12 and protruding radially outward,
20 and a pair of outer hub protrusions 21 and 21 provided on the cutout end of the outer hub portion 13 and protruding inward in the radial direction. In order to correspond to this, a pair of engaging leg pieces 22, 22 protruding inward are provided on the inner surface of the clamp piece 18. As shown in FIG. 3, the engaging leg pieces 22 and 22 are inserted between the inner hub projection 20 and the outer hub projection 21 and elastically engage with each other, whereby the clamp piece 18 is attached to the hub 8. Fixed.

On the outer peripheral surface of the outer hub portion 13 and the outer peripheral surface of the clamp piece 18 having the above-mentioned structure, the cushioning material 23,
24 are joined by an adhesive and are integrally provided. These cushioning materials 23, 24 are formed to have a substantially equal thickness so that the outer peripheral surfaces thereof become one circle as a whole, and are formed so as to cover the entire outer peripheral surface of the hub 8. As the material of the cushioning materials 23 and 24, for example, rubber or plastic having a surface hardness of JIS hardness 50 or less and 30 or more is suitable.

Here, the JIS hardness indicating the surface hardness of the cushioning materials 23 and 24 is the Japanese Industrial Standard (JIS) test method K6.
301. Further, as the material of the buffer materials 23 and 24, specifically, for example, butadiene rubber (B
R), isoprene rubber (IR), natural rubber (NR), nitrile rubber (NBR), silicone rubber (Si) and the like are preferable, but other rubbers as well as those having similar hardness Plastic can also be used.

By using such a material, the first
The tape reel 7 according to the embodiment can be configured. When the magnetic tape M showing a specific example of the tape is wound around the tape reel 7 having such a structure, for example, as shown in FIG. 3, the winding tightening force of the magnetic tape M causes the trailer tape T to start winding. A large portion of the portion cuts into the inside of the cushioning material 23, and the step portion 5 is absorbed in the cushioning material 23. Similarly, the gap 4 on both sides of the clamp piece 18
However, the cushioning material 24 provided on the outer peripheral surface of the clamp piece 18 and the cushioning material 23 provided on the outer peripheral surface of the outer hub portion 13 are blocked by elastic deformation. As a result, the magnetic tape M is wound around the outer peripheral surface of the hub 8 in a substantially circular shape, and the step 5
Also, the influence of the unevenness of the gap 4 on the magnetic tape M can be suppressed, and the occurrence of “sleeping” on the magnetic tape M can be suppressed.

Next, the tape reel 7 according to the first embodiment.
An experimental example of is shown. Table 1 shows an experimental example of the first embodiment, in which the hub 8 and the upper and lower flanges 9 and 11 are made of POM, and the cushioning materials 23 and 24 are made of silicone rubber (Si). A commercial metal tape (thickness 12.8 μm, width 19.01 mm) was wound up at a winding pressure of 300 g and left for 1 week in an environment of a temperature of 60 ° C. and a humidity of 80%, and then at room temperature and normal humidity (temperature of 10 ° C.). -Humidity 60%) Samples 1 to 7 were left for 1 day in an environment. The thickness of the cushioning materials 23 and 24 is 0.5 mm.
It is a degree.

[0023]

[Table 1]

In addition, Table 2 shows the same experiment using a conventional tape reel in order to compare with the experimental result of the tape reel 7 according to this embodiment. Except that there is no cushioning material 23, 24,
All other configurations, shapes, etc. are similar to those of the present embodiment.

[0025]

[Table 2]

Tables 1 and 2 show the results obtained by measuring the following three points of the above samples 1 to 11. In Tables 1 and 2, as the setting conditions, the roundness of the hub common to both, the surface hardness of the conventional hub and the corresponding surface hardness of the cushioning materials 23 and 24 of the present embodiment are specified. There is. The surface hardness of the cushioning materials 23, 24 and the hub is represented by JIS hardness according to JIS test method K6301.

Based on these setting conditions, samples 1 to 1
For 11, the "tape width variation", "hit variation", and "dropout (DO)" measurements were performed. Here, the "roundness of the hub" means the height difference (p
-P: peak-to-peak), which is expressed in μm units.

The "tape width variation" means the amount of variation (q) caused by the tape being displaced in the width direction due to the step portion 5 and the like, as shown in FIG. it's shown. This measurement is made by Nikon Majorscope MM-
I went to 22. The displayed value is the worst value, and the smaller the value, the better the result.

Furthermore, the "hit fluctuation" means a change in the magnitude of the output obtained by reproducing the contents recorded on the magnetic tape. Specifically, the "audio output fluctuation" is a change in the audio output. The "video output fluctuation" is used as the change in the video output and is expressed in dB. These output fluctuations are measured by Sony D-2VCR (D
2 format video cassette recorder: DVR-2
8). The displayed value is the worst value, and the smaller the value, the better the result.

Furthermore, "dropout (DO)" is the number [times / min] of how many times the output level is decreased by -6 dB or more per 10 [mu] s per minute. This measurement is based on Sony D-2VCR (DVR-2
8) and VH01CZ manufactured by Shibasoku Co., Ltd., and DVR-28 was connected to VH01CZ which is a dropout counter. The displayed values are average values, and the smaller the value, the better the result. It should be noted that it is good to satisfy all of these three measurement items.

According to Table 1 showing the results of this experiment, the accuracy of the roundness of the hubs 8 of Samples 1 and 2 is the highest and is 40 μm.
m, 50 μm for samples 3 to 5 and 6 for sample 6.
0 μm, Sample 7 is set to the lowest, 70 μm. Then, in these hubs 8, sample 1 has a cushioning material having a surface hardness of JIS hardness 30 and samples 2 and 3 have J
IS hardness 40 cushioning material, sample 4 JIS degree hardness 4
5 and the samples 5 to 7 are integrally provided with a JIS hardness 50 cushioning material.

As a result of measuring the samples 1 to 7 as described above, with respect to the tape width variation, in the samples 1 to 4, ≦ 2.
μm, ≦ 4 μm for sample 5, ≦ 6 μ for sample 6
m and sample 7, a value of ≦ 8 μm was obtained. From this result, it became clear that the tape width variation q becomes smaller as the surface hardness of the cushioning materials 23 and 24 becomes smaller and the circularity of the hub 8 becomes higher.

Similarly, regarding the variation of the hit, the variation of the audio output is ≤0.5d in Samples 1 to 3.
A value of ≦ 0.8 dB is obtained for B, Samples 4 and 5, and ≦ 1.0 dB is obtained for Samples 6 and 7, and video output fluctuations are ≦ 0.8 dB for Samples 1 to 3 and ≦ 1 for Samples 4 and 5. .1 dB, ≦ 1.4 for sample 6
The value of ≦ 1.7 dB was obtained for dB and sample 7. From this result, the audio output fluctuation and the video output fluctuation are similar to the tape width fluctuation, and the cushioning materials 23 and 2 are used.
It was clarified that as the surface hardness of No. 4 becomes smaller and the roundness of the hub 8 becomes higher, the variation of the hit becomes smaller.

Furthermore, dropout (-6 dB / 10 μm)
s) is 30 times / min for sample 1, 25 times / min for sample 2, and 20 times / mi for samples 3-7.
The value n is obtained. From this result, the cushioning materials 23, 2
When the surface hardness of No. 4 was JIS hardness 40 or more and the circularity of the hub was 50 μ or more, the measured values were all 20 times / min, and the dropout value did not change.
If the roundness of the hub is increased to 40 μ and the JIS hardness of the cushioning materials 23 and 24 is 40, the dropout becomes as high as 25, and if the JIS hardness is 30, the dropout is increased. It became clear that it increased to 30.

On the other hand, in the conventional tape reel, as shown in Table 2, the hubs of Samples 8 to 10 had a roundness of 50 μm.
The roundness of the hub of Sample 11 is 80 μm. The surface hardness of these hubs is JIS hardness 55 for sample 8, JIS hardness 60 for sample 9, JIS hardness 80 for sample 10 and JI for sample 11.
S hardness is set to 60. Samples 8 to 1 like this
As a result of measuring 1, the tape width variation was ≦ 10 μm for sample 8, ≦ 15 μm for sample 9, and ≦ 30 μm for samples 10 and 11.

Similarly, with respect to the variation of the hit, the variation of the audio output is ≦ 0.3 dB in Sample 8, ≦ 0.5 dB in Sample 9, and ≦ 0.8 in Sample 10.
dB, in Sample 11, a value of ≦ 1.5 dB was obtained,
Regarding the video output fluctuation, in Sample 8, ≦ 2.5d
B, Sample 9 has ≦ 3.0 dB, Samples 10 and 1
In the case of 1, a value of ≦ 4.0 dB was obtained. Furthermore, regarding the dropout (-6 dB / 10 μs), in Samples 8 to 10, it was 20 times / min, and in Sample 11, it was 40 times / min.
A value of min was obtained.

According to Table 2, when the surface hardness of the hub increases (hardens), the tape width variation (μm), the audio output variation (dB), and the video output variation (dB) are proportional to them. While it increased, it was revealed that the dropout (times / min) did not change. On the other hand, from the results of Sample 11, it is clear that even if the surface hardness of the hub is reduced, if the roundness of the hub is extremely bad, all the measurement results are bad. It was

On the other hand, according to Table 1 of the present embodiment,
While keeping the circularity of the hub 8 high to some extent (70 μm or less), the cushioning materials 23 and 24 are integrally provided on the outer peripheral surface of the hub 8 so that the surface hardness is set to JIS hardness 50 or less, thereby changing the tape width. Is the best value of the conventional example ≤ 10μ
Even if it is the lowest compared with m, it can be set to ≦ 8 μm,
In addition, as for the video output variation of the variation of hits, even if it is the minimum value compared with the best value of the conventional example ≦ 2.5 dB, ≦
It could be 1.7 dB. Therefore, according to the present embodiment, it is possible to greatly reduce the damage applied to the magnetic tape M due to the tightening of the tape, and it is possible to sufficiently exhibit the characteristics originally possessed by the magnetic tape M.

On the other hand, as is clear from Table 1, as the circularity of the hub 8 becomes higher and the surface hardness of the cushioning materials 23, 24 becomes smaller (softer), the tape width variation characteristic and the contact variation characteristic are both Although it is good, the dropout tends to increase on the contrary. It is considered that this is because when the surface hardness becomes small to some extent, the durability becomes insufficient and dropout easily occurs. Therefore, the surface hardness of the cushioning materials 23 and 24 is J
It is preferable to set the IS hardness within the range of 50 or less and 30 or more. The circularity of the hub 8 needs to be 70 μm or less.

As shown in FIGS. 4 and 5, according to the second aspect of the present invention.
The tape reel 27 according to the embodiment has a two-layer structure of the trailer tape TA, and the cushioning material is arranged on one of the layers. As shown in FIG. 4, the trailer tape TA, one end of which is fixed to the hub 28 that is a tape winding shaft and the other end of which is connected to the magnetic tape M, has a two-layer structure. This trailer tape TA is
The tape layer 30 is composed of a tape layer 30 and a buffer layer 31 as a buffer material laminated on the tape layer 30. The tape layer 30 and the buffer layer 31 are integrally formed by being bonded by an adhesive layer 32 made of an adhesive. ing. Then, the tape layer 30 and the magnetic tape M are joined via the splicing tape S, and thus the trailer tape TA and the magnetic tape M are connected.

As the material of the tape layer 30 of the trailer tape TA and the magnetic tape M, for example, polyethylene terephthalate (PETP) is suitable, but it goes without saying that other plastics can be used. The material of the buffer layer 31 is, for example, BR, IR, NR, N as in the buffer materials 23 and 24 of the first embodiment.
Various rubbers such as BR and Si, and various plastics having characteristics similar to these can be used. Further, as the material of the adhesive layer 32, various kinds of adhesives such as silicone adhesives used for joining this kind of tape can be used. By using such a material, the second
The trailer tape TA according to the embodiment can be constructed.

In FIG. 4, the trailer tape TA having such a structure is fitted and fixed by the clamp piece 3 to the hub 28 of the tape reel having the same structure as the conventional one. Then, after the trailer tape TA is wound around the hub 28 for a few turns, the magnetic tape M is wound up for a predetermined length.

When the magnetic tape M is wound for a predetermined length in this way, the buffer layer 31 of the trailer tape TA due to the winding tightening force of the magnetic tape M causes a step 5 to occur at the joint between the hub 28 and the magnetic tape M, The clamp piece 18 is elastically deformed so as to absorb the irregularities generated by the gaps on both sides of the clamp piece 18.
As a result, the magnetic tape M can be smoothly wound around the outer periphery of the hub 28, and the step 5 generated at the joint between the hub 28 and the magnetic tape M, the hub shape defect during reel molding, and other factors. It is possible to reduce the adverse effect on the magnetic tape M caused by the defective shape of the hub. Moreover, the above adverse effects can be improved without modifying the shape of the hub or modifying the tape fixing structure.

Next, an experimental example of the trailer tape TA according to the second embodiment will be shown. Table 3 shows an experimental example of the second embodiment. The trailer tape TA of the present embodiment is attached to the tape reel 27 using POM as the material of the hub 18 and the upper and lower flanges 9 and 11 for about 2 to 3 laps. Winding up, commercial metal tape (thickness 12.8 μm, width 19.
(01 mm) is wound with a winding pressure of 300 g, and the temperature is 45 ° C.
Samples 1 to 6 were left in an environment of 80% humidity for 1 week, and then left in an environment of normal temperature and normal humidity (temperature 10 ° C., humidity 60%) for 1 day.

[0045]

[Table 3]

Further, Table 4 shows the same experiment using the conventional trailer tape T in order to compare with the experimental result of the trailer tape TA according to the present embodiment.
These samples 7 to 10 have a single layer structure having only a tape layer.

[0047]

[Table 4]

The samples 1 to 10 were tested for "tape width variation", "hit variation" and "dropout (D
The results obtained by measuring three points of "O)" are shown in Tables 3 and 4. As a setting condition, the total thickness ta is set to 25 μm in common to both, while the surface hardness of the conventional trailer tape T and the surface hardness of the buffer layer 31 of the trailer tape TA of the present embodiment are appropriately changed. The surface hardness of the buffer layer 31 and the trailer tape T is also indicated by JIS hardness according to JIS test method K6301, as in the first embodiment.

Under these setting conditions, "tape width variation", "hit variation" and "dropout" were measured for each sample. These measuring instruments
It is the same as the one described above, and it can be said that the one satisfying all of these three measurement items is good.

In this experiment, in Samples 1 to 3 of the trailer tape TA, the thickness t1 of the tape layer 30 was set to 10 μm and the thickness t2 of the buffer layer 31 was set to 15 μm.
6 is a buffer layer 31 with the thickness t1 of the tape layer 30 being 15 μm.
Has a thickness t2 of 10 μm. Then, the surface hardness of the buffer layer 31 of Sample 1 and Sample 4 is set to JIS hardness 3
0, JIS hardness of the buffer layer 31 of sample 2 and sample 5 is 40, JIS JIS of the buffer layer 31 of sample 3 and sample 6
The hardness is set to 50 respectively. On the other hand, the conventional trailer tape T sample 7 to be compared
Sample Nos. 10 and 12 each have a tape layer thickness of 25 μm, and Sample 7 has a JIS hardness of 80, Sample 8 has a JIS hardness of 60, Sample 9 has a JIS hardness of 50, and Sample 10
JIS hardness is set to 30 respectively.

Thus, according to Table 3 showing the results of measuring Samples 1 to 6, regarding the tape width variation, the values of ≦ 2 μm for Sample 1, ≦ 5 μm for Samples 2 to 4 and ≦ 8 μm for Samples 5 and 6 were obtained. was gotten. From this result, it was clarified that when the surface hardness of the buffer layer 31 is reduced, the variation amount q of the tape width is reduced, and when the buffer layer 31 is thick, the variation amount q of the tape width is also reduced.

Similarly, with respect to the variation of the hit, the value of the audio output variation of ≦ 0.5 dB in the sample 1, ≦ 0.8 dB in the samples 2 to 4, and the ≦ 1.0 dB in the samples 5 and 6 are obtained. Regarding the output fluctuation, a value of ≦ 0.8 dB was obtained in Sample 1, ≦ 1.0 dB in Samples 2 to 4, and ≦ 1.4 dB in Samples 5 and 6. From this result, audio output fluctuation and video output fluctuation are similar to tape width fluctuation.
It has been clarified that the variation in hitting becomes smaller as the surface hardness of the buffer layer 31 becomes smaller and as the buffer layer 31 becomes thicker.

Further, regarding the dropout, a value of 30 times / min was obtained in samples 1 and 4, and a value of 20 times / min was obtained in samples 2, 3, 5 and 6. From this result, when the surface hardness of the buffer layer 31 is set to JIS hardness 30,
It became clear that there will be more dropouts.

On the other hand, in the conventional trailer tape T, with respect to the tape width variation, in Sample 7, ≦ 30 μ
m, ≦ 15 μm for sample 8 and ≦ 10 for sample 9
A value of μm was obtained. Also, regarding the fluctuation
Regarding the audio output fluctuation, in Sample 7, ≦ 0.
A value of ≦ 0.5 dB is obtained for 8 dB and samples 8 and 9, and for the video output fluctuation, ≦ 0.5 dB for sample 7.
A value of ≤3.0 dB was obtained for 4.0 dB and for samples 8 and 9. Further, regarding dropout, a value of 20 times / min was obtained in all of Samples 7 to 9. In Sample 10, neither tape width variation, audio output variation, video output variation, nor dropout could be measured. This is because when the hardness of the tape is set to JIS hardness 30 or less, the strength of the tape itself becomes too weak, and the tape is elongated or broken due to insufficient strength.

Further, according to Table 4, the trailer tape T
As the surface hardness increases, the tape width fluctuation (μm) increases in proportion to it, and when the surface hardness increases to some extent, the audio output fluctuation (dB) and the video output fluctuation (dB) gradually increase. However, it was revealed that the dropout (times / min) did not change. Furthermore, from the result of sample 10, the surface hardness is determined by JIS
It became clear that a hardness of 30 cannot be used as a trailer tape.

On the other hand, according to Table 3, the tape layer 3
By providing a buffer layer 31 made of rubber or plastic having a surface hardness of JIS 50 or less on 0 to form the trailer tape TA, it is possible to greatly improve the tape width variation and the hit variation. It was On the other hand, if the surface hardness of the buffer layer 31 is set to JIS hardness 30 or less, the dropout characteristics are deteriorated. Therefore, the surface hardness is preferably JIS hardness 30 or more. Therefore, the surface hardness of the buffer layer 31 that can be actually used is JIS hardness 50 or less and 30 or more.

As described above, the present invention is not limited to the above embodiment, and can be applied not only to tape reels used in DAT and other electronic equipment but also to open reels. In the second embodiment, the trailer tape is made up of the tape layer 30 and the buffer layer 3.
Although the example of the two-layer structure of 1 and 2 has been described, the structure may be three layers or four layers or more, and the buffer layer 31 may be provided in two or more layers. As described above, the present invention can be variously modified without departing from the spirit thereof.

[0058]

As described above, according to the present invention,
A cushioning material covering the entire outer peripheral surface is integrally provided on the tape winding shaft so that the roundness of the outer peripheral surface of the tape winding shaft is 70 μ or less and the surface hardness of the cushioning material is JIS hardness 50 or less 30
As the above rubber or plastic is used to wrap the tape over the cushioning material, the cushioning material elastically deforms with respect to the tape winding tightening force. The adverse effect of can be reduced by the cushioning material. Therefore, it is possible to suppress the formation of a so-called "sleeping" distortion pattern on the tape wound around the tape winding shaft, thereby reducing damage to the tape and reading the recording pattern during reproduction. It is possible to obtain an effect that deterioration can be reduced and occurrence of defective reproduction can be suppressed.

Further, since the trailer tape has a structure of two or more layers, the cushioning material is arranged on at least one layer, and the tape is wound on the cushioning material, the cushioning material is largely elastically deformed against the tightening force of the tape. Therefore, the elastic deformation of the cushioning material can reduce the influence of the unevenness of the tape step and the gap of the hub. Therefore, it is possible to suppress the occurrence of "sleeping" due to the tightening of the tape, thereby reducing the damage given to the tape and reducing the reading deterioration of the recording pattern during reproduction,
It is possible to obtain the effect of suppressing the occurrence of defective reproduction.

Further, the surface hardness of the cushioning material is JIS hardness 50.
Since 30 or more rubbers or plastics are used, it is possible to suppress the occurrence of "sleeping" due to the tightening of the tape, and it is possible to easily and inexpensively manufacture a trailer tape that can reduce the damage given to the tape. The effect is obtained.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a central portion of a tape reel showing a first embodiment of a tape winding structure of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a cross-sectional view showing a state where a main part of the hub of FIG. 2 is enlarged and a tape is wound.

FIG. 4 is an external perspective view showing a state in which a trailer tape according to a second embodiment of the tape winding structure of the present invention is wound around a tape reel.

5 is an enlarged perspective view showing a main part of the trailer tape shown in FIG. 4. FIG.

FIG. 6 is an explanatory diagram for explaining tape width variation.

FIG. 7 is a cross-sectional view showing a state in which a tape is wound on a conventional tape reel and showing an enlarged main part of a hub corresponding to FIG.

[Explanation of symbols]

 7,27 Tape reel 8,28 Hub 12 Inner hub 13 Outer hub 17 Clamp recess 18 Clamp piece 23,24 Buffer material 30 Tape layer 31 Buffer layer (buffer material) M Magnetic tape (tape) T, TA Trailer tape

Claims (3)

[Claims] 1. A buffer material is integrally provided on a cylindrical tape winding shaft so as to cover the entire outer peripheral surface of the tape winding shaft, and the circularity of the outer peripheral surface of the tape winding shaft is 70 μm or less. In addition, the surface hardness of the above cushioning material is JIS hardness 5
A tape winding structure characterized by comprising 0 or more and 30 or more rubber or plastic, and winding a tape on the cushioning material. 2. A trailer tape having one end wound one or more times around a cylindrical tape winding shaft and the other end connected to the tape has a structure of two or more layers by stacking two or more members, A tape winding structure, wherein a cushioning material is provided on at least one layer, and a tape is wound on the cushioning material. 3. The tape winding structure according to claim 2, wherein the cushioning material is rubber or plastic having a surface hardness of JIS hardness 50 or less and 30 or more.