JPH0935448A - Tape reel and tape cassette using the reel - Google Patents

Abstract

(57) [PROBLEMS] To provide a tape reel for smoothing the air flow in the reel and reliably preventing the winding disorder of the tape when the tape is wound at a high speed. SOLUTION: Tape reels 1L and 1R are composed of a synthetic resin reel 2 and a tape 7 wound around the reel 2. This reel 2 is fixed to a cylindrical hub 3 made of a synthetic resin, a disk-shaped lower flange 4 made of a synthetic resin in which the hub 3 is integrally formed in a central portion of the hub 3, and a top end of the hub 3 by a predetermined means. And a disk-shaped upper flange 5 made of synthetic resin. Tape contact surface 4 of lower flange 4
In a, a slit-shaped groove 6 as air flow adjusting means is provided.
Are formed at four positions at 90 ° intervals so as to extend in the tangential direction of the hub 3 in parallel with the radial direction of the lower flange 4.
Then, when the tape 7 is wound around the hub 3 of the winding side reel 2 at high speed, the air flow in the reel 2 is smoothed by the grooves 6, and the winding disorder of the tape 7 does not occur.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape reel and a reel thereof which prevent winding disorder of a tape such as a magnetic tape used as a recording / reproducing medium of a magnetic recording / reproducing apparatus even at high speed. The tape cassette used.

[0002]

2. Description of the Related Art For example, a video tape recorder (VT)
In R), a tape reel in which a magnetic tape for a recording / reproducing medium is wound around a reel is used. An open reel type tape reel used in this video tape recorder will be specifically described with reference to FIG.
Shows a state before the tape 7 is supplied from the tape reel 1L on the supply side of the pair of tape reels 1L and 1R used in the video tape recorder and is wound on the tape reel 1R on the winding side.

As shown in FIG. 12, each tape reel 1
L and 1R are composed of a reel 2 and a tape 7 wound around the reel 2. The reel 2 includes a cylindrical hub 3, a disk-shaped lower flange 4 formed by projecting the hub 3 in the center, and a disk-shaped upper flange 5 fixed to the upper end of the hub 3 by a predetermined means. Is equipped with. As shown in FIG. 12, FIG. 13 and FIG. 14 (a), a slit hole-shaped groove 4 b is radially formed on the inner surface (tape contact surface) 4 a of the lower flange 4 to the outer circumferential end of the lower flange 4. It is formed in several places so as to extend (note that this slit-shaped groove 4
Instead of b, as shown in FIG. 14 (b), slit-shaped grooves 4c penetrating therethrough may be formed radially). The tape 7 includes a magnetic tape 8 for a recording / reproducing medium, and transparent leader tape portions 9 connected to both ends of the magnetic tape 8.

When the tape 7 is fast forwarded (FF), the tape reel 1L on the left side in FIG. 12 is on the supply side and the tape reel 1R on the right side is on the winding side, and the tape 7 is from the reel 2 of the tape reel 1L. It is supplied and wound on the reel 2 of the tape reel 1R. When the tape 7 is rewound (REW), the tape reel 1R on the right side in FIG. 12 is the supply side and the tape reel 1L on the left side is the winding side, and the tape 7 is supplied from the reel 2 of the tape reel 1R. And is wound around the reel 2 of the tape reel 1L.

[0005]

However, a pair of the conventional open reel type tape reels 1L and 1R described above is used.
Then, when the tape 7 is fast forwarded or rewound, the tape 7
When the tape was wound at a high speed, the winding disorder of the tape 7 was likely to occur as shown in FIGS. That is,
FIG. 16 (b) shows a state in which there is a fine up-and-down movement of the tape 7 (disturbance with ridges and valleys like the grooves on the record board), and the tape 7 moves up and down with each revolution of the reel 2. ,
16C shows a state in which winding of the step-shaped tape 7 is disturbed, and a group of tapes 7 of several tens to several hundreds of rotations appear up and down and appear as a band. d)
Indicates that the tape 7 is loosely wound, and the tape 7 is lightly wound around the hub 3. The tape 7 that cannot be pulled out in the wound state can be pulled out, and it seems that there is no disorder in winding.

As described above, the tape 7 is pulled in the vertical direction at the part where the tape 7 is disturbed, and when the tape 7 is subjected to a strong impact, for example, during transportation of the tape reel 1L, 1R in the condition where the tape 7 is disturbed. The edges of No. 7 (particularly the top and bottom edges of the magnetic tape 8) were easily broken and damaged. If the tape 7 is stored in such a state for a long period of time, the tape 7 may meander or deform, and correct signals may not be recorded or reproduced when the tape is running. Further, if the tape 7 is loosely wound, an extremely low tape tension and an extremely high tape tension are sequentially generated when the tape 7 is run next time, which causes damage such as deformation and cutting of the tape 7, Furthermore, there is a possibility that the video tape recorder itself may be damaged.

Incidentally, as shown in FIG. 17, as a tape reel for winding a tape such as a movie film having a magnetic track, there is one in which a plurality of fan-shaped holes 4d are formed in the lower funnel 4'of the reel 2 '. However, the tape may fall into the many holes 4d of the lower runner 4'and the tape may be deformed, or the edge of the tape may be easily damaged by an impact such as during transport of the tape reel. However, the strength of the reel 2'is weak and the reel 2'is easily deformed.

Further, in the case of a tape cassette in which the tape reel is housed in a casing-type cassette body, the air flow is apt to be stagnant in the cassette body, and the tape becomes thinner with the increase in time in recent years. Moreover, while the length of the reel becomes longer and the reel becomes larger, the turbulence of air becomes more and more intense as the winding speed of the tape becomes faster, and the turbulence of the tape is apt to occur. Further, as the recording density of the tape becomes higher, the influence of the deformation of the tape becomes larger.

Therefore, the present invention provides a tape reel and a tape cassette using the reel, which can smooth the air flow in the reel and reliably prevent the winding disorder when the tape is wound at a high speed. It is a thing.

[0010]

A tape reel comprising a tape and a reel having a hub and a flange around which the tape is wound, and a tape cassette in which the tape reel is rotatably housed in a casing type cassette body. In the tape contact surface of the flange, there is provided an air flow adjusting means which is parallel to the radial direction of the flange and extends in the tangential direction of the hub. As a result, even if the tape is fast forwarded at high speed or rewound at high speed, the air flow in the reel becomes smooth through the air flow adjusting means, and the tape is disturbed around the reel hub. It is surely wound without.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.
This will be described in detail with reference to the drawings.

1 to 6 show a first embodiment of the present invention. The first embodiment is a pair of tape reels 1L and 1R used in a video tape recorder (VTR) as a magnetic recording / reproducing apparatus.

As shown in FIGS. 2, 3 and 5, each tape reel 1L, 1R is composed of a synthetic resin reel 2 and a tape 7 wound around the reel 2. The reel 2 has a cylindrical hub 3 made of synthetic resin, a disk-shaped lower flange 4 made of synthetic resin in which the hub 3 is integrally projectingly formed in the center, and fixed to the upper end of the hub 3 by a predetermined means. And a disc-shaped upper flange 5 made of synthetic resin.

As shown in FIGS. 1 to 4 and 6 (a), a slit hole-shaped groove 6 as an air flow adjusting means is provided on the inner surface (tape contact surface) 4 a of the lower flange 4.
4 are formed at 90 ° intervals so as to extend in the tangential direction of the hub 3 in parallel with the radial direction of. The width of each of the slit-shaped grooves 6 and 6 adjacent to each other is such that the tape 7 on the outer peripheral side of the lower flange 4 is wound from the rib 3 side (see FIGS. 2 and 3).
It is provided so as to become wider toward the middle arrow M direction), and as shown in FIGS.
In L and 1R, the slit-shaped grooves 6 are oriented in opposite directions. Further, the air flow adjusting means is not limited to the slit hole-shaped groove 6, but the slit hole-shaped groove 6 ′ that penetrates the groove 6 ′ as shown in FIG. 9 so that they are parallel and extend in the tangential direction of the hub 3.
You may comprise by forming 4 places at 0 degree intervals.

The tape 7 also comprises a magnetic tape 8 for a recording / reproducing medium, and transparent leader tape portions 9 connected to both ends of the magnetic tape 8. Both ends of the magnetic tape 8 and the end of each transparent leader tape 9 are connected by an adhesive tape (not shown) or the like, and the start of each transparent leader tape 9 is adhered to the hub 3 of each reel 2. They are connected by a tape (not shown) or the like.

According to the pair of tape reels 1L and 1R according to the first embodiment of the present invention, the tape 7 is fast-forwarded (FF).
Sometimes, the tape reel 1L on the left side in FIG. 1 is on the supply side and the tape reel 1R on the right side is on the winding side, and the tape 7 is supplied from the reel 2 of the tape reel 1L and wound on the reel 2 of the tape reel 1R. To be Further, when the tape 7 is rewound (REW), the tape reel 1R on the right side in FIG. 1 is the supply side, and the tape reel 1L on the left side is the winding side,
The tape 7 is supplied from the reel 2 of the tape reel 1R and wound on the reel 2 of the tape reel 1L.

When the tape 7 is fast-forwarded or rewound,
Even when the tape 7 is wound at a high speed, the winding disorder of the tape 7 does not occur unlike the conventional case. That is, when the tape 7 is wound at a high speed, the air in the upper and lower flanges 4 and 5 of the reel 2 is formed by the slit-shaped grooves 6 (or slit holes) provided on the tape contact surface 4a of the lower flange 4. Flow smoothly through the groove 6 '), and as shown in FIG.
The magnetic tape 8 is wound around the hub 3 of the reel 2 without causing winding disorder. Especially, the tape reel 1 on the winding side
On the tape contact surface 4a of the R (or 1L) lower flange 4,
Each slit-hole-shaped groove 6 (or each slit-hole-shaped groove 6 ') formed in four places at 90 ° intervals so as to extend in the tangential direction of the hub 3 in parallel with the radial direction of the lower flange 4. The width is between the tape 7 on the outer peripheral side of the lower flange 4 than the rib 3 side.
Since the width becomes wider in the winding direction (direction of arrow M in FIGS. 2 and 3), the air flow during high-speed winding is
The tape 7 smoothly flows so as to be pressed against the hub 3 side, and the tape 7 is reliably wound around the hub 3 without loosening or winding disorder.

In this way, even if the tape 7 is wound around the reel 2 at a high speed, it is possible to prevent the winding disorder of the tape 7 as in the conventional case. Therefore, for example, when the tape 7 is wound around the reel 2. Even if the reels 1L and 1R are subjected to a strong impact during transportation, the edges of the tape 7 (particularly the upper and lower edge portions of the magnetic tape 8) are not broken or damaged. Therefore, even if the tape reels 1L and 1R are stored for a long period of time while the tape 7 is wound around the reel 2, the tape 7 does not meander or deform, and after this long-term storage, Tape 7 by video tape recorder
Since the tape 7 is not deformed even when the tape is run, correct signal recording and reproduction can always be performed. Furthermore, since the winding looseness of the tape 7 can be surely prevented, extremely low tape tension and extremely high tape tension may occur sequentially when the tape 7 is run next time. Disappear. As a result, damage such as deformation and cutting of the tape 7 can be reliably prevented, and also damage to the video tape recorder itself can be reliably prevented.

The number of slit-hole-shaped grooves 6 (or each slit-hole-shaped groove 6 ') formed on the tape contact surface 4a of the lower flange 4 is as small as four, and each groove 6 (6 ′)
By making the width of the tape thin like a slit, the lower edge side of the magnetic tape 8 of the tape 7 is not damaged or damaged. In this way, since the groove width of each groove 6 (6 ') is thin and the number thereof is small, the influence on the strength of the reel 2 is small, and the versatile reel 2 can be manufactured at low cost. Particularly, the end of the lower flange 4 of the slit hole-shaped groove 6 (or each slit hole-shaped groove 6 ') on the outer peripheral side is shown in FIG.
As shown in (a) and (b), the lower flange 4 is formed up to the front of the outer peripheral edge of the lower flange 4 and does not extend completely to the outer peripheral edge of the lower flange 4 unlike the conventional one. Can be maintained sufficiently, and the reel 2 itself is not deformed.

FIG. 11 shows a second embodiment of the present invention. The second embodiment is a tape cassette 1 incorporating the pair of tape reels 1L and 1R of the first embodiment.
0, a cassette mounting position of a video tape recorder (VTR) as a magnetic recording / reproducing device (a pair of reel stands)
It is used by being attached to. The tape cassette 10 is a cassette body 11 made of a synthetic resin and having a front opening (not shown) that exposes the tape 7 on the front side.
A lid 12 made of synthetic resin that opens and closes the front opening of the casing-type cassette body 11, and the casing-type cassette body 1
A pair of tape reels 1L rotatably housed in 1
1R.

On the inner surface (tape contact surface) 4a of each lower flange 4 of each tape reel 1L, 1R, a slit hole-shaped groove 6 (or slit hole-shaped groove 6 ') as air flow adjusting means is provided. Four portions are formed at 90 ° intervals so as to extend in the tangential direction of the hub 3 in parallel with the radial direction of the lower flange 4, and other configurations are the same as those of the first embodiment. is there.

When the tape cassette 10 is mounted in the cassette mounting position of the VTR, a light source lamp (light emitting portion) 20 for light detection is provided at the approximate center of the front opening of the cassette body 11.
Is to be inserted. Also, the cassette body 1
A rectangular window hole 11b is formed on each of the light detection optical paths C ₀ on both sides of 1. Then, when the transparent leader tape portion 9 comes to the window hole 11b of the cassette body 11, the light ray C ₀ emitted from the light source lamp 20 passes through the transparent leader tape portion 9 and is detected by the phototransistor 21 as a light receiving portion. The running of the magnetic tape 8 on the tape 7 is automatically stopped.

According to the tape cassette 10 of the second embodiment of the present invention described above, the lamp 20 is formed by the phototransistor 21.
When the light ray C ₀ is not detected, the magnetic tape 8 of the tape 7 is running, and when the light ray C ₀ is detected, the transparent leader tape portion 9 is running. That is, it is judged that the magnetic tape 8 has finished running, and the running of the magnetic tape 8 is stopped. Then, when the tape 7 is fast forwarded (FF) or rewound (REW), even if the tape 7 is wound at a high speed, the tape 7 is wound when the tape 7 is wound at a high speed as in the second embodiment. Disturbance does not occur.

A tape cassette 10 in which a pair of tape reels 1L and 1R is housed in a casing type cassette body 11
In this case, the air flow is apt to stay in the cassette body 11, but the slit-shaped groove 6 of the lower flange 4 is formed.
(Or a slit-shaped groove 6 ')
The air flow in the inside becomes smooth, and even if the winding speed of the tape 7 is further increased, the air turbulence is small and the winding turbulence of the tape 7 does not occur. Further, even if the tape 7 becomes thin and long and the reel 2 becomes large due to the long time in recent years, the disorder of the winding of the tape 7 can be surely prevented, and the recording of the magnetic tape 8 of the tape 7 can be improved. It is possible to sufficiently deal with densification.

According to the embodiments of the present invention, the tape reel and the tape cassette for the video tape recorder as the magnetic recording / reproducing apparatus have been described, but other magnetic recording such as an audio tape recorder and a digital audio tape recorder. Needless to say, each of the embodiments of the present invention can be applied to a tape reel and a tape cassette for a reproducing device. Further, the air flow adjusting means for preventing the winding disorder of the tape is not limited to the groove depressed in the slit hole shape or the groove penetrating in the slit hole shape, and the slit hole groove and the slit hole groove are alternately arranged. Or a combination of
The air flow adjusting means may be configured by projecting a plurality of convex ribs or the like so as to be parallel to the diameter direction of the flange and extend in the tangential direction of the hub. Further, the number of air flow adjusting means is not limited to four, and may be further provided on the upper flange side. Furthermore, it goes without saying that the tape is not limited to a commercial large tape, but may be a magnetic tape for a home VTR, a motion picture film having a magnetic track, or the like.

In the second embodiment, the tape cassette for the home VTR which optically detects the presence / absence of the transparent leader tape portion has been described. However, in a tape cassette for business use having an opaque leader tape portion having magnetism. It goes without saying that the second embodiment can be applied to a device that magnetically detects the presence or absence of the opaque leader tape portion.

[0027]

EXAMPLE An experimental example as an example of the first embodiment of the present invention will be described below with reference to FIGS.

As a tape 7 for experiments, a VTR (for example,
The large tape used for Sony's Digital Betacam for business is used, and the lower flange 4
4 slit-hole-shaped grooves 6'on the tape contact surface 4a of
The reel 2 formed at 0 ° intervals was used.

As a result of the experiment, when the commercially available standard reel was used and FF / REW was repeated at high speed, the winding disorder of the tape occurred. The winding disorder was unstable as the tape was run. However, when FF / REW was similarly repeated at high speed using the reel 2 in which the tape contact surface 4a of the lower flange 4 of the present embodiment was provided with the slit-like groove 6 ', the winding of the tape 7 was not disturbed at all. It was

FIG. 7 shows the winding position of the tape 7, where L is the winding diameter of the tape 7, T is the beginning of the winding of the tape 7, R is the winding of the tape 7, and E is the ending of the winding of the tape 7. Indicates the range of the groove effective for the air flow in the immediate vicinity of the tape, θ'is the rotation angle of the reel 2 having the groove 6'of the present embodiment, and θ "is the rotation of the reel 2 having the conventional radial groove 4b. The corners and D are the portions where the tape 7 is running in the reel 2 (the grooves 4b,
6'is effective), S'is the length of the groove 6'of the present embodiment from the middle of the winding of the tape 7 to the end, and S'is the conventional radial groove 4
It is the length from the middle part of the tape 7 of b to the end part.
Further, Table 1 shows comparative values of the effective range due to the difference in the direction between the conventional radial groove 4b and the groove 6'of the present embodiment. In Table 1, the value of the groove 6'of the present embodiment is shown when the value of each item (start of winding, middle of winding, end of winding) of the conventional radial groove 4b is 1. Indicates the value when the length of the effective second groove 6'is added at the same time.

[0031]

[Table 1]

As shown in FIG. 8 and Table 1, the groove 6'of this embodiment can have a longer groove length (S '> S ") as compared with the conventional radial groove 4b, and the reel 2 It can be seen that there is a long time effect also in the movement of the groove due to the rotation of 1. That is, when the tape 7 is wound at high speed, a large amount of air flows in the reel 2 and the air flows smoothly.

Further, since the vicinity of the beginning of the tape 7 is near the hub 3 behind the lower flange 4 and the air flow is poor, the groove 6'in this embodiment is particularly advantageous at the beginning of the winding of the tape 7. The difference is significant. Further, as shown in FIG. 9, in the vicinity of the beginning of the winding of the tape 7, the effective reel 2 of the groove 6'of this embodiment is formed.
The rotation angle θ ′ of is over 90 °. In the portion exceeding 90 °, the next groove 6'has already been applied to the tape 7 and is effectively working. It can be said that the effective length of the groove 6'is long as shown in FIG.

As described above, the groove 6'of the present embodiment has an extremely high effect at the beginning of winding the tape 7. If the groove 6'of this embodiment has the same area as that of the conventional radial groove 4b, the groove 6'of this embodiment has a narrow slit because the effective length of the groove 6'is longer than that of the conventional groove 4b. -Shaped slots can be formed, and the edge of the tape 7 is less damaged.

[0035]

As described above, according to the present invention, a tape reel comprising a tape and a reel having a hub around which the tape is wound and a flange, and the tape reel in a casing type cassette body. In a rotatably accommodated tape cassette, the tape contact surface of the flange is provided with air flow adjusting means extending parallel to the radial direction of the flange and extending in the tangential direction of the hub, whereby the tape is wound at high speed. However, it is possible to reliably prevent the winding disorder of the tape. As a result, it is possible to reliably prevent the tape from being deformed or damaged.

[Brief description of drawings]

FIG. 1 is a perspective view showing a pair of tape reels according to a first embodiment of the present invention.

FIG. 2 is a perspective view of the left tape reel of the first embodiment.

FIG. 3 is a perspective view of the right tape reel of the first embodiment.

FIG. 4 is a plan view of the right tape reel of the first embodiment.

5 is a cross-sectional view taken along the line AA in FIG.

6A is a cross-sectional view of the lower flange taken along line BB in FIG. 4, and FIG. 6B is a cross-sectional view of another aspect of the lower flange.

FIG. 7 is an explanatory view showing the winding position of the tape of the tape reel of the first embodiment.

FIG. 8 is an explanatory diagram showing a range of a groove effective for air flow in the immediate vicinity of the tape between the tape reel of the first embodiment and the conventional tape reel.

FIG. 9 is a graph showing comparative experimental data of the rotation angle of the reel in which the groove of the tape reel of the first embodiment and the conventional tape reel are effective.

FIG. 10 is a graph showing comparative experimental data of effective lengths of grooves of the tape reel of the first embodiment and the conventional tape reel.

FIG. 11 is a perspective view showing a tape cassette according to a second embodiment of the present invention.

FIG. 12 is a perspective view of a pair of conventional tape reels.

FIG. 13 is a plan view of the lower flange side of the conventional tape reel.

FIG. 14A is a side view of a lower flange portion of the tape reel of the conventional example, and FIG. 14B is a side view of another aspect of the lower flange portion.

FIG. 15 is an enlarged cross-sectional view showing a disordered winding state of the tape of the conventional tape reel.

16A is a perspective view showing a winding state where there is no winding disorder of the tape, FIG. 16B is a perspective view showing a state where there is fine winding motion of the tape which moves vertically, and FIG. 16C is a stepped tape. 3D is a perspective view showing a state where there is winding disorder, and FIG. 3D is a perspective view showing a state where the tape is loosely wound.

FIG. 17 is a plan view showing a lower flange of another aspect of the conventional tape reel.

[Explanation of symbols]

 1L, 1R ... Tape reel 2 ... Reel 3 ... Hubs 4, 5 ... Upper and lower flanges 4a ... Inner surface (tape contact surface) 6 ... Slit hole-shaped groove (air flow adjusting means) 6 '... Slit hole-shaped groove ( Air flow adjusting means) 7 ... Tape 8 ... Magnetic tape 9 ... Leader tape section 10 ... Tape cassette 11 ... Cassette body

Claims (4)

[Claims] 1. A tape reel comprising a tape and a reel having a hub and a flange for winding the tape, wherein a tape contact surface of the flange is parallel to a radial direction of the flange and is tangential to the hub. A tape reel characterized in that it is provided with an air flow adjusting means extending in the direction. 2. The tape reel according to claim 1, wherein the tape is composed of a magnetic tape for a recording / reproducing medium and a leader tape portion connected to an end portion of the magnetic tape. reel. 3. A tape cassette comprising a tape, a tape reel comprising a reel around which the tape is wound, and a reel having a flange, and a casing type cassette main body accommodating the tape reel rotatably. A tape cassette, characterized in that an air flow adjusting means extending parallel to a radial direction of the flange and extending in a tangential direction of the hub is provided on a tape contact surface of the flange. 4. The tape cassette according to claim 3, wherein the tape comprises a magnetic tape for a recording / reproducing medium and a leader tape portion connected to an end portion of the magnetic tape, and the inside of the cassette body. A tape cassette characterized in that a pair of tape reels on the supply side and the winding side are rotatably housed therein.