JP2000357381A - Tape cassette and reel for tape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain reels for tapes having good dimensional stability and excellent sliding characteristics and a tape cassette having these reels for tapes by forming the material of at least the center pins of the reels to be polyamide. SOLUTION: This tape cassette has a part of the reels 22 and 23 which have winding core parts 55 to be wound with the magnetic tape 24, an upper flange 52 and lower flange 54 disposed at both ends of the winding core parts 55 apart a prescribed spacing to each other and the center pins 53 arranged in the central parts at one end of the winding core parts 55. The magnetic tape 24 is wound around both reels 22 and 23 and the reels are freely rotatably supported within a cassette casing 21. The center pins 53 of the respective reels 22 and 23 are pressed by retaining springs 25. The material of at least the center pins 53 is formed of the polyamide.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape cassette in which a pair of reels around which a magnetic tape is wound are rotatably housed, and each of the reels is urged by a pressing spring, and a tape for use in the tape cassette. It relates to a reel.

[0002]

2. Description of the Related Art Conventionally, as this kind of tape cassette, for example, the one shown in FIGS. 10 and 11 is generally known. FIG. 10 is a cross-sectional view showing a main part of an 8 mm digital video cassette. The tape cassette 1 (first conventional example) includes a cassette housing 2, a pair of tape reels 3, a magnetic tape 4, a pressing spring 5, and the like. The cassette casing 2 of the tape cassette 1 is composed of an upper case 6 and a lower case 7 which are vertically overlapped. A pair of reels 3 and 3
Is rotatably housed. One end of a magnetic tape is wound around each reel 3.

[0003] A pair of reels 3 and 3 are composed of a reel upper body 8 composed of a single upper flange, a lower flange 9a and a core 9b.
And lower body 9 integrally formed with and sentan pin 9c
It is composed of The lower flange 9a has a donut shape, and a cup-shaped core portion 9b is continuous with the inner peripheral edge thereof. The reel body 8 is arranged on the opposite side of the lower flange 9a of the core part 9b. A plurality of connecting pins 9d provided on the core part 9b are penetrated through the reel body 8, and the connecting pin 9d is caulked to fix the reel body 8 to the reel lower body 9 to be integrated. Have been.

The opening side of the core part 9b of the reel lower body 9 is a hub part 10 provided with a plurality of ribs in the circumferential direction. The annular portion projecting outward from the lower flange 9 a of the hub portion 10 is loosely fitted into a hub hole 11 provided in the lower case 7. A center pin 9c that protrudes in a conical shape is provided at the center of the closed-side end face of the core part 9b. The center pin 9c protrudes upward through a through hole 8a provided in the reel upper body 8. The pressing spring 5 attached to the upper case 6 is pressed against the vertex of the center pin 9c. The presser spring 5 urges the reel 3 toward the lower case 7.

FIG. 11 is a sectional view showing a main part of a video cassette such as VHS or β-max. This tape cassette 12 (second conventional example) has substantially the same configuration as the above-described tape cassette 1, and includes a cassette housing 2, a pair of tape reels 13, a magnetic tape 4, and a pressing spring 5.
And the like, but are different in the configuration of the reel 13. The reel 13 includes a reel upper body 8 formed of a single upper flange, a reel lower body 14 integrally formed with a lower flange 14a and a core 14b, and a center member 15 formed of a single sentan pin. I have.

The center member 15 has a conical portion 15a to which the pressing spring 5 is pressed, and a flange-shaped fixing portion 15b provided on the large diameter side of the conical portion 15a. The fixing portion 15b of the center member 15 is fitted into a concave portion provided at the center of the closed side end surface of the core portion 14b, and the conical portion 15a projects upward through the through hole 8a of the reel body 8. ing. The fixing portion 15b is connected to the reel body 8 and the core 14b.
And a connecting pin 14c sandwiched between the
The reel upper body 8, the reel lower body 14, and the center member 15 are integrally fixed by caulking.

[0007]

However, in such a conventional tape cassette, both the tape cassette 1 according to the first conventional example and the tape cassette 12 according to the second conventional example have the center pin. 9c
Alternatively, the pressing spring 5 is pressed against the center member 15, and the tape spring 3 or 1 is pressed by the spring force of the pressing spring 5.
3 was prevented from rising. As a result, the center pin 9c or the center member 15 and the presser spring 5 always make sliding contact while the reel 3 or 13 is driven to rotate, so that a large sliding frictional resistance is generated at the contact portion.

Therefore, it is necessary to use a material having high wear resistance and excellent slidability for the sliding portion. Therefore, in either case of the first and second conventional examples,
As a material of the reel 3 or 13, a synthetic resin such as POM (polyacetal) is used, and as a material of the presser spring 5, a metal such as a stainless steel plate is used. The POM used for the reels 3 and 13 is characterized in that it has high mechanical strength due to its crystallinity and is excellent in abrasion resistance, chemical resistance and the like.

However, in the case of a crystalline resin such as POM, there is a problem that the dimensional stability at the time of manufacturing is poor, so that it is difficult to use it for a reel upper body or a reel lower body requiring dimensional accuracy. . That is, since the crystalline resin has a large volume difference between the liquid state and the solid state, during the production of injection molding a reel upper body or a reel lower body using a mold, even after being removed from the mold, the The molded article continues to shrink until the temperature drops to a predetermined temperature (normal temperature). As a result, it is difficult to keep the dimensions after the shrinkage has subsided within a predetermined range, and as described above, the dimensional stability of the upper and lower reels is poor.

SUMMARY OF THE INVENTION The present invention has been made in view of such conventional problems, and a tape reel having good dimensional stability and excellent slidability by using polyamide as a material of at least a center pin of the reel, and a tape reel having the same. It is an object of the present invention to provide a tape cassette having a tape reel.

[0011]

Means for Solving the Problems In order to solve the above-mentioned problems and the like, and to achieve the above-mentioned object, a first aspect of the present invention is described.
The tape cassette described above is disposed at the center of one end of the core, one end of the core, an upper flange and a lower flange provided at both ends of the core at a predetermined interval from each other. A pair of reels having a center pin and a magnetic tape wound around both reels, rotatably supported in the cassette housing, and pressing the center pin of each reel with a pressing spring. It is characterized in that the material is polyamide.

According to a second aspect of the present invention, in the tape cassette, the pair of reels includes a reel lower body in which a core portion and a lower flange are integrally formed, and a reel in which an upper flange and a center pin are integrally formed. And the upper body of the reel is made of polyamide.

According to a third aspect of the present invention, in the tape cassette, the pair of reels includes a reel lower body in which a core portion, a lower flange and a center pin are integrally formed, and a reel upper body made of a single upper flange. And the lower body of the reel is made of polyamide.

According to a fourth aspect of the present invention, in the tape cassette, the pair of reels includes a reel lower body in which a core portion and a lower flange are integrally formed, a reel upper body made of a single upper flange, and a center pin. A center member formed of a single body, the center member is formed of polyamide, and the center member is sandwiched between a lower reel and an upper reel.

According to a fifth aspect of the present invention, there is provided a tape reel comprising: a core on which a magnetic tape is wound; an upper flange and a lower flange provided at both ends of the core at a predetermined interval from each other; And a center pin disposed at the center of one end of the tape reel, wherein at least the center pin is made of polyamide.

According to a sixth aspect of the present invention, there is provided a tape reel having a reel lower body in which a core portion and a lower flange are integrally formed, and a reel upper body in which an upper flange and a center pin are integrally formed. The reel upper body is formed of polyamide.

According to a seventh aspect of the present invention, there is provided a tape reel comprising: a reel lower body in which a core portion, a lower flange and a center pin are integrally formed; and a reel upper body made of a single upper flange. The lower body is formed of polyamide.

The tape reel according to claim 8 of the present invention is a reel lower body in which a core portion and a lower flange are integrally formed, a reel upper body composed of a single upper flange, and a center composed of a single center pin. The center member is formed of polyamide, and the center member is sandwiched between the lower reel body and the upper reel body.

With the above construction, in the tape cassette according to the first aspect of the present invention, since at least the center pin is formed of polyamide, the dimensional stability of the tape reel is ensured while the slidability of the tape reel is ensured. The tape cassette can be configured using a reel having excellent slidability and dimensional stability.

In the tape cassette according to the second aspect of the present invention, since the upper body of the reel having the center pin is formed of polyamide, the slidability and dimensional stability of the tape reel are improved, and the inside of the cassette housing is improved. A tape cassette capable of absorbing moisture and suppressing rust on the magnetic tape can be configured.

In the tape cassette according to the third aspect of the present invention, since the lower body of the reel having the center pin is formed of polyamide, the slidability and the dimensional stability of the tape reel are improved, and the moisture in the cassette housing is improved. And a tape cassette that can suppress generation of rust on the magnetic tape by absorbing the magnetic tape.

In the tape cassette according to the fourth aspect of the present invention, since the center pin is formed of polyamide, a tape cassette which can improve the slidability and dimensional stability of the tape reel can be constituted.

In the tape reel according to the fifth aspect of the present invention, since at least the center pin is formed of polyamide, a tape reel capable of improving dimensional stability while maintaining good slidability can be constituted. it can.

In the tape reel according to the sixth aspect of the present invention, since the reel upper body having the center pin is formed of polyamide, the slidability and dimensional stability are improved while absorbing moisture in the cassette housing. Thus, a tape reel that can suppress the occurrence of rust on the magnetic tape can be configured.

In the tape reel according to the seventh aspect of the present invention, since the reel lower body having the center pin is formed of polyamide, the slidability and dimensional stability are improved while absorbing moisture in the cassette housing. Thus, it is possible to form a tape reel that can suppress the occurrence of rust on the magnetic tape.

In the tape reel according to claim 8 of the present invention, since the center pin is formed of polyamide, a tape reel capable of improving slidability and dimensional stability can be constituted.

[0027]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 9 show an embodiment of the present invention, which is applied to an 8 mm digital video cassette as a tape cassette.

FIG. 1 is an exploded perspective view showing a tape cassette according to a first embodiment of the present invention, FIG. 2 is an enlarged perspective view showing an essential part of FIG. 1, and FIG. 4 is a side view, FIG. 5 is a bottom view, FIG. 6 is a rear view, FIG. 7A is an enlarged cross-sectional view taken along line XX of FIG. 3, and FIG. 7B is a tape cassette according to the embodiment. FIG. 8A is a view taken in the direction of the arrow Y, FIG. 8 is an explanatory view showing a cross section of a main part of the tape cassette according to the second embodiment of the present invention, and FIG. 9 is a view showing a third embodiment of the present invention. It is explanatory drawing which shows the principal part of a tape cassette in cross section.

As shown in FIG. 1, a tape cassette 20 according to the first embodiment has a cassette housing 21 formed of a substantially rectangular parallelepiped and a pair of supply units rotatably housed in the cassette housing 21. Side reel 22 and take-up side reel 2
3 and a magnetic tape 24 wound on both reels 22 and 23
And a pair of pressing springs 25, 25 for pressing the pair of reels 22, 23, a front lid 26, a rear lid 27 for protecting the magnetic tape 24, and the like.

The cassette housing 21 of the tape cassette 20
Is composed of an upper case 28 and a lower case 29 which are vertically overlapped as shown in FIGS. The lower case 29 of the cassette housing 21 has a substantially rectangular lower surface 29a, a front surface 29b, a rear surface 29c, and left and right side surfaces formed to rise upward at four sides of the lower surface 29a. 29d and 29e. The lower surface 29a of the lower case 29 has two hub holes 3
0a and 30b are provided at predetermined intervals in the longitudinal direction. The hub portions of the pair of reels 22 and 23 are loosely fitted into these hub holes 30a and 30b, respectively, and are rotatably supported.

The upper case 28 of the cassette housing 21
Has an oblong upper surface portion 28a which is also substantially rectangular, a front surface portion 28b, a rear surface portion 28c, and left and right side surface portions 28d and 28e formed so as to fall down on four sides of the upper surface portion 28a. I have. On the upper surface 28a of the upper case 28, a see-through window 32 for seeing through the inside is provided extending in the longitudinal direction. A window member 33 made of a transparent material is fitted into the see-through window 32 to be integrally formed.

At the front of the cassette housing 21, a loading opening 34 into which a guide pin or the like of a loading mechanism (not shown) of a cassette deck is inserted, and a tape insertion hole 35a opened on both outer sides of the opening 34. , 35b
Are provided. Then, each tape insertion hole 35a,
Guide portions 36a and 36b projecting in a semi-cylindrical shape for guiding the magnetic tape 24 are provided inside the 35b. Thus, the magnetic tape 24 is mounted so as to go out of the cassette housing 21 through one of the tape insertion holes 35a, cross the opening 34, and reenter the cassette housing 21 through the other tape insertion hole 35b.

Further, at the front of the cassette housing 21,
And the like, as shown in FIG.
Front lid 2 that can open and close 5a, 35b
6 and a rear lid 27 are rotatably mounted. The front lid 26 is rotatably supported by the cassette housing 21 and is urged by a torsion coil spring 37 in a direction to close the opening 34. One end of a rear lid 27 is rotatably connected to the front lid 26. The other end of the rear lid 27 is slidably supported by the cassette housing 21.

Also, as shown in FIG.
A reel lock mechanism 40 is provided at a substantially central portion in the longitudinal direction on the back side of the inside 1. This reel lock mechanism 40
When the tape cassette 20 is not used, the pair of reels 22 and 2
The lock 3 is locked to prevent its rotation, and when used, the lock is released to allow the pair of reels 22 and 23 to rotate. The reel lock mechanism 40 includes a reel lock body 41, a pair of reel lock pieces 42, 42,
And a reel lock spring 43. The reel lock main body 41 is slidably supported in a front-rear direction within a reel lock storage section 44 provided in the cassette housing 21. On the front surface of the reel lock body 41, a pair of reel lock pieces 42, 42 are provided so as to open outward. A reel lock spring 43 is provided between the rear surface of the reel lock body 41 and the rear surface portion 29c of the cassette housing 21.
Has been curtailed.

When the reel lock body 41 is in the forward position by being urged by the spring force of the reel lock spring 43, the pair of reel lock pieces 42, 42 are engaged with the pair of reels 22, 23, respectively. Reels 22, 23
Is locked. On the other hand, when the reel lock body 41 is at the retracted position against the spring force of the reel lock spring 43, the pair of reel lock pieces 42, 4
2 is separated from the pair of reels 22 and 23, respectively, so that the reels 22 and 23 are unlocked.

The opening / closing operation of the reel lock mechanism 40 is executed by a lock release pin provided on a cassette deck (not shown). For this reason, as shown in FIG. 5, a through hole 45 is provided at a position corresponding to the reel lock mechanism 40 in the lower case 29 of the cassette housing 21 so that the lock release pin is inserted and removed.

In FIG. 1, reference numeral 46 denotes an erroneous erasure prevention member. A part of the erroneous erasure prevention member 46 is exposed from an operation window 47 opened on the back surface of the cassette housing 21. By sliding the erroneous erasure prevention member 46 from the operation window 47, it is possible to selectively switch between a position where recording on the magnetic tape is possible and a position where recording is not possible. Reference numeral 48 denotes a lock lever of the front lid 26. The lock lever 48 locks the front lid 26 with the opening 34 closed, and the lock of the front lid 26 is released by moving the lock lever 48 backward.

A pair of reels 22, which are locked and unlocked by the above-described reel lock mechanism 40,
Reference numeral 23 is configured as shown in FIGS. The same pair of reels 22 and 23 are used, one of which is a supply side reel 22 corresponding to the winding direction of the magnetic tape 24 and the other is a winding side reel 23.
It has been. These reels 22 and 23 include a reel upper body 50 and a reel lower body 51.

The upper body 50 of each of the reels 22 and 23 is
The upper flange 52 and the center pin 53 are integrally formed to constitute one member. The upper flange 52 is formed in a disk shape, and a fitting portion 52a that protrudes in a disk shape is provided on one surface side in the center portion.
The surface of the upper flange 52 on the side where the fitting portion 52a bulges is provided with a tapered surface 52b inclined toward the outer peripheral side. A conical center pin 53 is provided at the center of the concave side surface of the fitting portion 52a of the upper flange 52.

The reel lower body 51 of each of the reels 22 and 23 has
The lower flange 54 and the core 55 are integrally formed to form a single member. Lower flange 5
Numeral 4 is formed in a ring shape, and a boss-shaped core portion 55 is integrally formed at a central portion thereof. A large number of engaging teeth 56 are provided on the outer peripheral edge of the lower flange 54 at equal intervals in the circumferential direction. And the lower flange 5
4 has a tapered surface 5 inclined toward the outer peripheral side.
4a is provided. The core 55 is formed of a cylindrical body having an open end surface, and a plurality of ribs 57 arranged at equal intervals in the circumferential direction are provided in the hole.
As a result, the core 55 constitutes a hub on which a reel base such as a video deck is detachably mounted.

On the outer surface of the closed end portion 55a of the core portion 55, a concave portion into which the fitting portion 52a of the upper flange 52 is fitted is provided. Further, a plurality of connecting pins 58 are provided on the outer surface of the closed side end 55a at substantially equal intervals in the circumferential direction. These connecting pins 58 are connected to the upper flange 52.
Is inserted through the through-hole 52c provided in the hole. This through hole 5
By fixing the tip end of the connecting pin 58 penetrating through 2c with a fixing means such as ultrasonic crimping, the reel upper body 50 and the reel lower body 51 are integrally connected to form the reels 22 and 23.

Also, as shown in FIG.
An engaging portion 59 with which the tape fixing piece 60 is engaged is provided on the outer peripheral surface of the core portion 55. After inserting the leading end of the magnetic tape 24 into the engaging portion 59, the tape fixing piece 60
Is fitted to the engaging portion 59, so that the magnetic tape 2
4 are fixed to the reels 22 or 23 at both ends in the longitudinal direction. Of the pair of reels 22 and 23 connected by the magnetic tape 24, the one on which most of the magnetic tape 24 is wound is the supply reel 22, and the other is the winding reel 23.

When the pair of reels 22 and 23 are housed at predetermined positions in the cassette housing 21, they are pressed by presser springs 25 and 25, respectively.
Is biased to the side. As shown in FIG.
Is formed by an elongated plate-shaped spring material. One end of the presser spring 25 in the longitudinal direction is fixed to the inner surface of the upper case 28 by fixing means such as ultrasonic caulking, and the other end is extended above each of the reels 22 and 23 and pressed against the center pins 53 and 53, respectively. Have been.

As the material of the above-mentioned reels 22 and 23, in the reel body 50 having the center pin 53, nylon 6, nylon 66 or other polyamide (P
Apply A). On the other hand, as the material of the reel lower body 51, polyamide (PA) such as nylon 6 may be applied as in the case of the reel upper body 50, but POM (polyacetal), ABS (acrylonitrile / butadiene / styrene resin), and other synthetic materials. Use resin. The reel body 50 may be formed by two-color molding, and at least the center pin 53 may be made of polyamide.

As described above, at least the center pin 53 is made of polyamide such as nylon 6 because the polyamide is considered to be the most suitable material for the center pin 53. Polyamide is
This is a general term for polymers having an acid amide bond (-CONH-). Nylon 6 used in this example has a relatively high melting point of 215 ° C., is excellent in wear resistance and slidability, has good mechanical strength, and is used as an engineering plastic. In particular, nylon 6 has a property that dimensional stability during injection molding is good. Therefore, using a polyamide such as nylon 6, at least the center pin 53 is made of polyamide (for example,
Nylon 6).

Table 1 shows the test results of the abrasion resistance and slidability of the center pin 53 made of such a material with respect to the tape winding speed.

[0047]

[Table 1]

In this test, a similar test was conducted for two types of POM (polyacetal) for comparison with the test results of nylon 6. General POM, which is a first comparative object, is a general-purpose engineering plastic, which has high mechanical strength, good wear resistance and chemical resistance, and is used for mechanical parts such as gears and electric parts. It has the characteristic of. The high-sliding POM, which is the second comparative object, has higher abrasion resistance and slidability in addition to the characteristics of a general POM.

In this test, the center pin 53 was
M, high-sliding POM and nylon 6 were used, and the state of the center pin 53 at that time was inspected by winding the magnetic tape 24 at the speed shown in Table 1. In Table 1, ○ indicates that the top portion of the center pin 53 did not melt, and X indicates that the top portion of the center pin 53 melted. In addition, the symbol “△” indicates that the test was not actually performed, but the top portion of the center pin 53 is estimated not to melt.

According to the test results, in the general POM,
When the tape winding speed (m / sec) is 15 m / sec,
The top portion of the center pin 53 did not melt, but at a tape winding speed of 20 m / sec or more, the result was that the top portion melted. Also, high sliding POM
, The tape winding speed (m / sec) is 15m / sec or more2
Up to 5 m / sec, the top portion of the center pin 53 did not melt, but at 30 m / sec, the result was that the top portion melted.

On the other hand, in the case of nylon 6, when the tape winding speed was 20 m / sec, the top portion of the center pin 53 did not melt. In addition, in the case of nylon 6, the test was not performed when the tape winding speed was 25 m / sec, but considering the properties of nylon 6,
It is considered that the top portion of the center pin 53 does not melt out, similarly to the high sliding POM.

According to the test results, it was found that nylon 6 has almost the same abrasion resistance and slidability as the high sliding POM. The tape winding speed m / sec adopted in this test is considerably faster than the tape winding speed in normal use of the tape cassette 20. The tape winding speed during normal use is as follows, and differs depending on the television standard system. In the case of the NTSC system, the tape winding speed during reproduction is 0.1186 m.
/ Sec, and the tape winding speed at the time of fast forward / rewind is 4.151 m / sec. In the case of the PAL system,
The tape winding speed at the time of reproduction is 0.1015 m / sec, and the tape winding speed at the time of fast forward / rewind is 3.552.
m / sec. In either system, the tape winding speed during fast-forward / rewind is 35 times the tape winding speed during normal use.

The tape winding speed of 20 used in this test was
The m / sec is 4.82 times in the NTSC system and 5.63 times in the PAL system as compared with the tape winding speed at the time of fast-forward / rewind. Therefore, this test, which was performed at 4 to 5 times the speed of normal use, was severe for the material of the center pin 53, and proved friction resistance and slidability under such severe conditions. The nylon 6 thus formed can sufficiently serve as a center pin.
In addition, since nylon 6 is excellent in dimensional stability at the time of molding, the reel body 50 which requires dimensional accuracy is required.
Also, when used as a material of the reel lower body 51, a material having sufficiently high dimensional accuracy can be manufactured.

As shown in FIG. 8, the tape cassette 20A according to the second embodiment of the present invention comprises
FIG. This tape cassette 20A
Is composed of a combination of a reel upper body 64 composed of a single upper flange, and a reel lower body 65 in which a lower flange 66, a core 67, and a center pin 68 are integrally formed. . Center pin 68
Is provided so as to protrude conically at the center of the closed end 67 a of the core 67. Correspondingly,
A through hole 69 is formed at the center of the fitting portion 64a of the reel body 64.
The center pin 68 passes through the through hole 69 and projects above the reel upper body 64.

The inner surface of the reel body 64 has a tapered surface 64b.
And a tapered surface 66a having an inclination angle corresponding to the tapered surface 64b is provided on the inner surface of the lower flange 66. An engagement tooth 56 with which the reel lock piece 42 of the reel lock mechanism 40 is engaged is provided on the outer peripheral edge of the lower flange 66. And the core 6
A rib portion 57 is provided on the inner surface of 7. Further, a coupling pin 58 provided on the core 67 passes through a through hole 64 c provided on the reel body 64. The projection of the coupling pin 58 is caulked using ultrasonic waves or the like, whereby the reel upper body 64 and the reel lower body 65 are integrally assembled to form the reel 62. Other configurations are the same as those of the first embodiment.

As shown in FIG. 9, the tape cassette 20B according to the third embodiment of the present invention comprises a third tape reel.
FIG. This tape cassette 20B
The reel 72 used in the first embodiment is composed of a reel upper body 74 composed of a single upper flange, a reel lower body 75 integrally formed with a lower flange 76 and a core 77, and a center member 78 composed of a single center pin. It is configured by a combination. The center member 78 has a conical projection 78.
a and a disk-shaped fixing portion 78b provided on the bottom surface side of the projection 78a having a large diameter.

A recess 77b for accommodating the fixing portion 78b of the center member 78 is provided at the closed end 77 of the core portion 77.
a is provided at the center. The center member 78 is sandwiched between the reel upper body 74 and the reel lower body 75 by sandwiching the fixing portion 78b fitted into the concave portion 77b with the fitting portion 74a of the reel upper body 74. The projection 78 a of the center member 78 passes through a through hole 79 provided at the center of the reel body 74. The distal end of the presser spring 25 is pressed against the upper end of the projection 78a that penetrates through the through hole 79 and projects above the reel upper body 74.

Further, a tapered surface 74b is provided on the inner surface of the reel body 74, and a tapered surface 76a having an inclination angle corresponding to the tapered surface 74b is provided on the inner surface of the lower flange 76. The reel lock piece 42 of the reel lock mechanism 40 is
There is provided an engagement tooth 56 with which is engaged. The rib portion 57 is provided on the inner surface of the core portion 77. Further, the connecting pin 5 provided at the closed end 77a of the core 77
8 penetrates a through hole 74 c provided in the reel body 74. By crimping the coupling pin 58 using ultrasonic waves or the like, the reel upper body 74, the reel lower body 75, and the center member 78 are integrally assembled to form the reel 72. Other configurations are the same as those of the first embodiment.

The materials of the reels 62 and 72 include a reel lower body 65 having a center pin 68 in the second embodiment and a center member 7 in the third embodiment.
In the case of No. 8, nylon 6, nylon 66, or other polyamide (PA) is applied. On the other hand, as the material of the reel upper body 64 in the second embodiment, and the reel upper body 74 and the reel lower body 75 in the third embodiment, polyamide (PA) such as nylon 6 is used as in the case of the reel lower body 65 and the like. POM (Polyacetal) or ABS
(Acrylonitrile butadiene styrene resin) Other synthetic resin is used. In the second embodiment,
The reel lower body 65 may be formed by two-color molding, and at least the material of the center pin 68 may be polyamide.

The reel 62 or 7 having such a configuration
The same effects as those of the first embodiment can be obtained also by the tape cassettes 20A and 20B using the tape cassette 2. That is, by using a polyamide (for example, nylon or the like) as a material of at least the center pins 53, 68 or the center member 78, it is excellent in dimensional stability at the time of molding and suitable for a reel requiring dimensional accuracy, A reel excellent in wear resistance and slidability can be configured. Also, by forming at least one of the reel upper bodies 50, 64, 74 or the reel lower bodies 51, 65, 75 from a polyamide (for example, nylon) having a water absorbing property, the magnetic material wound around the pair of reels 62, 72 can be used. Rust can be prevented from being generated on the tape 24. For example, when the magnetic tape 24 is a vapor-deposited tape, rust may be generated due to moisture existing in the atmosphere in the cassette housing 21, but when the reel upper body or the like is formed of a material having water absorbency. By absorbing the moisture in the cassette housing 21 by the reel body or the like, the generation of rust on the magnetic tape 24 can be prevented or suppressed.

As described above, the present invention is not limited to the above embodiment. For example, in the above embodiment, an example in which the present invention is applied to an 8 mm digital video cassette has been described. Needless to say, the present invention can be applied to a tape cassette and other tape cassettes. Thus, the present invention can be variously modified without departing from the spirit thereof.

[0062]

As described above, according to the first aspect of the present invention,
According to the tape cassette described above, since at least the center pin is made of polyamide, the dimensional stability can be improved while ensuring the slidability of the tape reel, and the slidability and dimensional stability can be improved. The effect that a tape cassette can be comprised using the reel excellent in this can be acquired.

According to the tape cassette of the second aspect of the present invention, the reel is formed of two parts, the upper body of the reel and the lower body of the reel, and the material of the upper body of the reel having the center pin is made of polyamide. The structure can be simplified, and the cost can be reduced by eliminating the center pin assembling step. Furthermore, it is possible to provide a tape cassette that can suppress or prevent rust on the magnetic tape by absorbing moisture in the cassette housing while improving the slidability and dimensional stability of the tape reel. Can be obtained.

According to the tape cassette of the third aspect of the present invention, the reel is formed by two parts, the upper body of the reel and the lower body of the reel, and the material of the lower body of the reel having the center pin is made of polyamide. Can be simplified and the cost can be reduced by eliminating the center pin assembling step. Furthermore, it is possible to provide a tape cassette that can suppress or prevent rust on the magnetic tape by absorbing moisture in the cassette housing while improving the slidability and dimensional stability of the tape reel. Can be obtained.

According to the tape cassette of the fourth aspect of the present invention, the reel is formed by the three parts of the upper body of the reel, the lower body of the reel, and the center member, and the center member having the center pin is made of polyamide. It is possible to provide a tape cassette that can suppress or prevent rust from being generated on the magnetic tape by absorbing moisture in the cassette housing while improving the slidability and dimensional stability of the tape reel. Obtainable.

According to the tape reel of the fifth aspect of the present invention, since at least the center pin is made of polyamide, it is possible to provide a tape reel having excellent slidability and dimensional stability. The effect can be obtained.

According to the tape reel of the sixth aspect of the present invention, the reel is formed of two parts, the reel upper body and the reel lower body, and the reel upper body having the center pin is made of polyamide. The component configuration can be simplified, and the cost can be reduced by eliminating the center pin assembling step. Furthermore, it has excellent slidability and dimensional stability,
The effect of being able to provide a tape reel that can suppress or prevent rust from being generated on the magnetic tape by absorbing moisture in the cassette housing can be obtained.

According to the tape reel of the present invention, the reel is formed of two parts, the upper body of the reel and the lower body of the reel, and the material of the lower body of the reel having the center pin is made of polyamide. The structure can be simplified, and the cost can be reduced by eliminating the center pin assembling step. Furthermore, it has excellent slidability and dimensional stability,
The effect of being able to provide a tape reel that can suppress or prevent rust from being generated on the magnetic tape by absorbing moisture in the cassette housing can be obtained.

According to the tape reel of the present invention, the reel is formed of three parts, the upper body of the reel, the lower body of the reel, and the center member, and the center member having the center pin is made of polyamide. Therefore, it is possible to obtain an effect of providing a tape reel that is excellent in slidability and dimensional stability and that can suppress or prevent rust from being generated on the magnetic tape by absorbing moisture in the cassette housing.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of a tape cassette according to the present invention, and is an exploded perspective view applied to an 8 mm digital video cassette.

FIG. 2 is an enlarged view of a main part of the tape cassette shown in FIG. 1, and is a perspective view showing a pair of reels and a magnetic tape.

FIG. 3 is a plan view of the tape cassette shown in FIG.

FIG. 4 is a side view of the tape cassette shown in FIG.

FIG. 5 is a bottom view of the tape cassette shown in FIG.

FIG. 6 is a rear view of the tape cassette shown in FIG. 1;

7A and 7B show main parts of the tape cassette shown in FIG. 1, wherein FIG. A is an explanatory view showing a cross section of a reel and the like, and FIG.

FIG. 8 is a sectional view of a tape cassette according to a second embodiment of the present invention, showing a main part of the tape cassette.

FIG. 9 is a sectional view of a tape cassette according to a third embodiment of the present invention, showing a main part of the tape cassette.

FIG. 10 shows a first example of a conventional tape cassette, and is an explanatory diagram showing a cross section of a main part of the tape cassette.

FIG. 11 shows a second example of a conventional tape cassette, and is an explanatory diagram showing a cross section of a main part of the tape cassette.

[Explanation of symbols]

20, 20A, 20B tape cassette, 21 cassette housing, 22, 23, 62, 72 reel, 24
Magnetic tape, 25 presser spring, 28 upper case,
29 lower case, 40 reel lock mechanism, 5
0, 64, 74 reel upper body, 51, 65, 75 reel lower body, 52 upper flange, 53, 68 center pin, 54, 66, 76 lower flange, 55, 67,
77 core part, 55a, 67a, 77a closed end, 69, 79 through hole, 78 center member (center pin)

Claims (8)

[Claims] 1. A core part on which a magnetic tape is wound, an upper flange and a lower flange provided at both ends of the core part at a predetermined distance from each other, and a center part of one end of the core part. Center pin,
A tape cassette comprising a pair of reels having the following: a magnetic tape wound around both reels, rotatably supported in a cassette housing, and pressing the center pin of each reel with a pressing spring. Tape cassette characterized by using polyamide as the material. 2. The pair of reels include a reel lower body in which the core portion and the lower flange are integrally formed, and a reel upper body in which the upper flange and the center pin are integrally formed. 2. A tape cassette according to claim 1, wherein said reel upper body is made of polyamide. 3. The pair of reels includes a reel lower body in which the core portion, the lower flange, and the center pin are integrally formed, and a reel upper body made of a single upper flange. The tape cassette according to claim 1, wherein the lower body is formed of polyamide. 4. The pair of reels, wherein the reel lower body in which the core and the lower flange are integrally formed, a reel upper body composed of a single upper flange, and a center member composed of a single center pin. 2. The tape cassette according to claim 1, wherein the center member is formed of polyamide, and the center member is sandwiched between the lower reel body and the upper reel body. 5. A core part on which a magnetic tape is wound; an upper flange and a lower flange provided at both ends of the core part at a predetermined interval from each other; and a center part of one end of the core part. Center pin,
A tape reel, characterized in that at least the center pin is made of polyamide. 6. A reel lower body in which the core portion and the lower flange are integrally formed, and a reel upper body in which the upper flange and the center pin are integrally formed. 6. The tape reel according to claim 5, wherein the reel is made of polyamide. 7. A reel lower body in which the core portion, the lower flange, and the center pin are integrally formed, and a reel upper body made of a single unit of the upper flange, wherein the reel lower body is formed of polyamide. The tape reel according to claim 5, wherein: 8. A reel lower body in which the core portion and the lower flange are integrally formed, a reel upper body formed of a single upper flange, and a center member formed of a single center pin. 6. The tape reel according to claim 5, wherein the center member is made of polyamide, and the center member is sandwiched between the reel lower body and the reel upper body.