JP3460377B2 - Tape reel - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape reel such as a magnetic tape which is a recording / reproducing medium, and more particularly, to a tape turbulence during high-speed winding on a tape reel. The present invention relates to a tape reel which prevents the occurrence of a tape reel. FIG. 10 shows an example of a conventional tape reel of this type. A tape take-up shaft 3 around which a tape T is wound around a reel hub 2 which is the center of a tape reel 1 indicated by reference numeral 1 and has a space therebetween is integrally formed via a rib (not shown) on an outer peripheral portion thereof. The inside of the reel hub 2 is formed with a hub hole 2a whose lower end is opened and a hub driving claw 2b on the inner wall thereof. A disc-shaped lower reel flange 4 is integrally formed on the reel hub 2 and the tape winding shaft 3, and an upper reel flange 5 is fixed to the upper end of the reel hub 2 by a caulking portion 6 so as to face the lower reel flange 4. Have been. [0003] During operation of a recording / reproducing apparatus such as a VTR, a tape is frequently wound up (FF) from one reel to the other reel or rewinded (REW) at a high speed. The problem with this high-speed winding operation of the tape is that the tape is turbulent due to the turbulence of air in the reel generated by the entanglement of air at the time of tape winding, that is, the winding of the wound tape T. That is, the surfaces become irregular as shown in FIG. The cause of the turbulence of the air has been found to be due to the turbulence of the entangled air at the time of tape winding because the space between the tape T wound around the winding surface of the reel and the reel flanges 4 and 5 is narrow. I have. [0004] Such irregularities in the tape winding surface cause damage to the tape edge due to friction of the tape edge surface with the reel flange and external pressure, and
The appearance is unfavorable and the commercial value of the tape reel is impaired. [0005] In addition, the tape turbulence is reduced in a high-density recording tape because the track width is narrow.
There has been a problem in characteristics such that an appropriate recording / reproducing characteristic (waveform per RF) cannot be obtained due to fluctuation of the tape hit by the rotating head. [0006] As a method of avoiding the above-mentioned problems, it is necessary to improve the shape of the tape reel at the time of high-speed winding of the tape. Further, in recent years, as the demand for high-density recording has increased, the necessity of high-speed winding of the tape in a short time has increased due to the tendency of the tape to become thinner and longer-time recording. There is a demand for a tape reel that can be wound up without causing any wrinkles. SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has as its object to provide a tape reel that can stably wind a high-speed winding of a tape without winding disturbance. In order to achieve the above-mentioned object, a tape reel according to the present invention comprises a tape winding shaft having a tape winding surface and two ends of the tape winding shaft. In a tape reel constituted by a reel flange provided opposite thereto, a winding surface of a tape take-up shaft is formed on an inclined winding surface such that an outer diameter increases from one reel flange side to the other reel flange side. Winding surface
On the other reel flange side where the outer diameter increases continuously
A flat surface is partially formed on the winding surface . The tape reel of the present invention constructed as described above has a tape winding surface formed such that the outer diameter increases from one reel flange side to the other reel flange side.
Continuing with the inclined winding surface, the other reel
The width between the inner surfaces of the reel flange is substantially increased by forming a partly flat surface on the winding surface on the flange side and making the side length of the tape winding surface of the tape winding shaft substantially longer than the width between the inner surfaces of the reel flange. The space between the tape wound on the tape winding surface and the tape reel can be widened without changing the dimensions and tape width. And the tape can be stably wound without being disturbed. The tape reel according to the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of an example of the tape reel of the present embodiment. The tape reel is designated by the reference numeral 1 as a whole. A tape take-up shaft 3 around which a tape is wound is formed integrally with a reel hub 2 forming the center of the tape reel 1 via a rib (not shown) at an outer peripheral portion of the reel hub 2 with a space therebetween. A hub hole 2a is formed and a hub driving claw 2b is formed on an inner wall thereof. And this reel hub 2
And a disk-shaped lower reel flange 4 on the tape winding shaft 3.
Are integrally formed, and an upper reel flange 5 is fixed to an upper end portion of the reel hub 2 by a caulking portion 6 so as to face the lower reel flange 4. In the present invention, attention has been paid to the fact that the tape can be wound without any disturbance by stabilizing the flow of entangled air during high-speed winding of the tape. That is, in the tape reel 1 shown in FIG. 1, a tape winding surface 7 having a convex curved surface in which the central portion of the outer peripheral surface of the tape winding shaft 3 is formed into a mountain shape is shown in FIG. In the tape reel 1, the tape winding shaft 3 is formed on a tape winding surface 8 having a concave curved surface in which a center portion of an outer peripheral surface of the tape winding shaft 3 is formed as a valley. FIG. 3 shows a state in which the tape T is wound on the tape reel 1 shown in FIG. 1 at high speed, and FIG. 4 shows a state in which the tape T is wound on the tape reel 1 shown in FIG. 2 at high speed. Show. That is, the tape T is wound tightly along the shape of the tape winding surface 7 of the convex curved surface or the tape winding surface 8 of the concave curved surface, so that the width dimension between the upper and lower reel flanges 4 and 5 is obtained. In addition, the space between the tape T and the inner surfaces of the upper and lower reel flanges 4 and 5 can be substantially increased without changing the tape width. It can be made easy to slip out easily. As a result, the tape can be wound in a state where the tape is neatly wound by the stable flow of air. Hereinafter, test examples of the tape reel of the present invention will be described. For the test, a digital VTR device manufactured by Sony Corporation and a tape cassette using a metal tape that is recorded and reproduced as a digital signal were used. The state of the tape winding shape after 10 consecutive passes,
This was performed by confirming the waveform per RF (frequency variation) during recording and reproduction. In the tape reel used in the experiment, in the case of the tape winding surface 7 having a convex curved surface shown in FIG. 1, the sample 1 has an outer diameter portion A at the center of the winding surface and outer diameter portions B at both upper and lower ends of the winding surface. When the outer diameter difference is +0.6 mm, the outer diameter difference between the center outer diameter portion A of the winding surface and the outer diameter portions B at the upper and lower ends of the winding surface is +1. The distance is changed by 1 mm from 0 mm to +5.0 mm. In the case of the tape winding surface 8 having a concave curved surface shown in FIG. 2, in the sample 7, the outer diameter portion A at the center of the winding surface has a difference in outer diameter from the outer diameter portion B at the upper and lower ends of the winding surface. In the case of 0.6 mm and hereinafter, in Samples 8 to 12, the outer diameter difference between the center outer diameter portion A of the winding surface and the outer diameter portions B at both upper and lower ends of the winding surface is -1.0 mm to -5. It is changed by 1 mm at a time to 0 mm. Samples 13 and 14 are the conventional tape reels shown in FIG. 10 with no difference in outer shape in the winding surface, and were tested as comparative examples. The following criteria were used in determining the tape winding shape.・ ・ ・: 20% or less of turbulence occurs on the entire winding surface △: 50% or less of turbulence occurs on the entire winding surface X: 50% on the entire winding surface % Or more is generated. The waveform per RF was recorded / reproduced after a tape cassette using the tape reel of the present invention was wound at high speed for 10 passes in a VTR apparatus. The confirmation is the result of determining the minimum level with respect to the peak level by decibel conversion in the RF envelope waveform by the oscilloscope. The following criteria were used in the judgment.・ ・ ・: The minimum level is 1 db relative to the peak level
Within △: The minimum level is 2 db relative to the peak level
Within x: minimum level is 2 db with respect to peak level
Table 1 below shows the test results of tape winding on a tape reel. [Table 1] As apparent from the test results, in the tape reels, the difference in AB dimension was +1.0 to ++ for samples 2 to 5.
In the range of 4.0 mm, and in the range of −1.0 to −4.0 mm in the AB dimension difference in samples 8 to 11, the winding shape is superior to the comparative examples of samples 13 and 14, and The result which did not affect the waveform per RF was obtained. The AB difference of Sample 1 is +0.6.
It was found that the waveform per RF was good in the range where the AB dimension difference of Sample 7 was less than or equal to -0.6 mm or more, but improvement of the tape winding shape could not be expected. The sample 5 has a difference in AB dimension of +4.
In the range exceeding 0 mm and when the AB dimension difference of the sample 11 is less than -4.0 mm, the tape winding shape is good, but the tape surface shape is deformed and affects the waveform per RF. Therefore, in the tape reel of the present invention, in the case of the tape winding surface 7 of the convex curved surface shown in FIG.
1.0 to +4.0 mm, and in the case of the tape winding surface 8 having a concave curved surface shown in FIG. 2, the AB dimension difference is -1.0 to -4.0.
Millimeters are a desirable range. It should be noted that the tape winding surface of the tape winding shaft may be configured to be substantially longer in width than the width between the inner surfaces of the reel flanges.
The present invention is not limited to the tape winding surface shapes shown in FIGS. Hereinafter, other winding surface shapes will be described. FIG. 5A shows an inclined winding surface 9 in which the tape winding surface of the tape winding shaft 3 increases in outer diameter from the lower reel flange 4 side to the upper reel flange 5 side. FIG. 5B shows a tape winding surface having an upper reel flange 5.
This is a shape formed on the inclined winding surface 10 such that the outer diameter increases from the side to the lower reel flange 4 side. FIG. 6A shows an inclined surface 11 having a tape winding surface whose outer diameter increases from the lower reel flange 4 side to the upper reel flange 5 side, and a part of the tape winding surface continuing from the inclined surface 11 to the upper reel flange 5 side. FIG. 6B shows a tape winding surface having a flat surface 11a formed thereon, and FIG. 6B shows a tapered surface 12 having a tape winding surface whose outer diameter increases from the upper reel flange 5 side to the lower reel flange 4 side. And a tape winding surface shape in which a flat surface 12a is partially formed on the lower reel flange 4 side. FIG. 7A shows the shape of a wavy tape winding surface 13 in which the tape winding surface is continuous on the lower reel flange 4 side and the upper reel flange 5 side is mountain-like, and FIG. Mountain side, upper reel flange 5 on side
The side is a shape of a wavy tape winding surface 14 that is continuous in a valley shape. FIG. 8A shows the shape of a wavy tape winding surface 15 in which the tape winding surface is formed in a mountain shape on the side of the upper and lower reel flanges 4 and 5 and the center of the winding surface is formed in a valley shape, and FIG. The wavy tape winding surface 16 has a valley shape on the side and a winding surface center portion that is continuous in a mountain shape. FIG. 9A shows the shape of a tape winding surface 17 in which the tape winding surface is flat on the upper and lower reel flanges 4 and 5 side, and the center of the winding surface is a valley-shaped continuous tape winding surface. FIG. The tape winding surface 18 has a flat surface on the sides 4 and 5 and a tape winding surface 18 in which the center of the winding surface is continuous in a mountain shape. In each of the tape winding surfaces shown in FIGS. 5 to 9, the dimensional difference between the inner and outer diameters of the winding surface is 1.0 to 4.0.
Desirably in the millimeter range. The present invention is not limited to the embodiment described above and shown in the drawings, and various modifications can be made without departing from the scope of the invention. In the test example, a tape reel for a metal tape which is recorded and reproduced as a digital signal is shown. However, the present invention can be widely applied to a tape reel for a general analog tape. [0038] As has been described in the foregoing, the tape reel of the present invention forms as the tape winding surface is the outer diameter increases from one reel flange side to the other reel flange side
Continuing with the inclined winding surface, the other
By forming a flat surface partially on the winding surface on the side of the flange ,
The side length of the tape winding surface of the tape winding shaft may be substantially longer than the width between the inner surfaces of the reel flange.
Can, the space between the inner surface of the tape and the tape reel without changing the width and the tape width between the inner surfaces of the reel flange that can be widened, the air flow entrainment during tape fast winding to the space Since the tape can be easily removed smoothly, the tape can be wound up in a state where the tape is neatly wound by a stable flow of air.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of an example of the tape reel of the present invention. FIG. 2 is a cross-sectional view of a state where the tape is wound on the tape reel of FIG. 1; FIG. 3 is a sectional view of another example of the tape reel of the present invention. FIG. 4 is a cross-sectional view showing a state where the tape is wound on the tape reel of FIG. 3; FIG. 5 is a partial cross-sectional view of another example of the tape winding surface. b is a partial cross-sectional view of another example of the tape winding surface. FIG. 6 is a partial cross-sectional view of another example of the tape winding surface. b is a partial cross-sectional view of another example of the tape winding surface. FIG. 7a is a partial cross-sectional view of another example of the tape winding surface. b is a partial cross-sectional view of another example of the tape winding surface. FIG. 8 is a partial cross-sectional view of another example of the tape winding surface. b is a partial cross-sectional view of another example of the tape winding surface. FIG. 9 is a partial cross-sectional view of another example of the tape winding surface. b is a partial cross-sectional view of another example of the tape winding surface. FIG. 10 is a cross-sectional view showing how a tape is wound on a conventional tape reel. DESCRIPTION OF SYMBOLS 1 Tape reel 2 Reel hub 3 Tape take-up shaft 4 Lower reel flange 5 Upper reel flange 7 Tape winding surface of convex curved surface Tape winding surface of concave curved surface 13, 14, 15, 16 Wavy tape winding surface 17 , 18 Tape winding surface

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 23/087 508

Claims (1)

(1) A tape reel comprising: a tape winding shaft having a tape winding surface; and reel flanges provided opposite to both shaft ends of the tape winding shaft. in the above winding surface of the tape winding shaft is formed as an inclined winding surface such as the outer diameter increases from one reel flange side to the other reel flange side, the outer diameter increases continuously to the inclined winding surface The other Lee
A tape reel characterized in that a flat surface is partially formed on the winding surface on the side of the flange .