JP2570515B2 - Tape cassette - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape cassette used for a magnetic recording / reproducing apparatus such as a VTR and a DAT.

[0002]

2. Description of the Related Art A magnetic tape cassette 1 shown in FIG. 4 has been conventionally proposed as a tape cassette used in a magnetic recording / reproducing apparatus such as a VTR and a DAT. Magnetic tape
The tape cassette 1 comprises a general cassette housing 2, a supply reel hub 3 forming a supply reel, a winding reel hub 4 forming a winding reel, a magnetic tape 5, and a tape. Guide 6,
7, a rotating lid 8, and a loading means insertion hole 9 into which loading means of the magnetic recording / reproducing apparatus is inserted.

FIG. 5 shows a supply side tape shown in FIG.
FIG. 6 is an enlarged view of a state in which the winding member 5a, the supply reel hub 3 and the supply reel disk 10 of the magnetic recording / reproducing apparatus are connected, and FIG. FIG. 6 is a sectional view taken along line VI-VI in FIG.

The supply-side reel hub 3 has a magnetic tape 5 wound around an outer peripheral surface 3a to form a supply-side tape wound body 5a, and the upper and lower cassette halves 2a, 2a of the cassette housing 2 are formed. 2
b, and the upper and lower cassette halves 2 are guided by the elastic force of the sliding sheet 11.
Positioning in the height direction is performed within a and 2b, and positioning in the horizontal direction is performed by a method (not shown).

[0005] The magnetic tape cassette 1 having such a configuration is used for the VT.
When the magnetic tape cassette 1 is inserted into a magnetic recording / reproducing apparatus such as an R, the rotating lid 8 is opened by moving the magnetic tape cassette 1 to the operating position, and loading means (not shown) provided in the magnetic recording / reproducing apparatus is opened. It is inserted into the loading means insertion hole 9.

The reel disks on the supply side and the winding side are inserted into the reel disk insertion holes of the reel hubs 3 and 4 on the supply side and the winding side. A well-known engaging groove 3c formed radially is formed in the inner peripheral surface 3b of the supply-side reel hub 3 to be a reel disc insertion hole, and the outer peripheral surface 10a of the supply-side reel disk 10 is formed. Engage with the claw portion 10b provided at the lower part,
A coupling for transmitting the winding force is formed, and the rotation of the supply-side reel disk 10 is applied to the supply-side reel hub 3 or the rotation of the supply-side reel hub 3 is applied to the supply-side reel disk 10.
Is transmitted to

After the brakes on the supply and take-up reel hubs 3 and 4 are released, the magnetic tape 5 is unwound from the magnetic tape cassette 1 by the movement of the loading means. The recording / reproducing operation is performed while being attached to a guide drum having a built-in rotary head over a predetermined range.

[0008]

In the above-described magnetic tape cassette 1, there is a problem when the magnetic recording / reproducing device such as the perpendicularity of the supply side and take-up side reel disks and the mechanical accuracy of the magnetic tape cassette are high. Of course, the recent magnetic recording / reproducing apparatus and the magnetic tape cassette have been reduced in size and weight, the magnetic tape has been made thinner, and the recording density has been increased.

FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5 when the perpendicularity of the supply-side reel disk 10 to the reference plane is high. For example, as shown in FIG. When 10 is perpendicular to the reference plane and has an inclination of θ, the insertion of the supply reel disk 10 into the magnetic tape cassette 1 causes the collision between the supply reel disk 10 and the supply reel hub 3. Surface (Supply reel disc 1)
0) and the inner peripheral surface 3b of the supply-side reel hub 3).
Has a length of L and is in surface contact,
The supply-side tape winding body 5a together with the supply-side reel hub 3 also rotates in the state shown in FIG.

For this reason, the magnetic tape cannot be absorbed by the elastic force of the sliding sheet, causing rotation unevenness, and the magnetic tape comes into contact with the upper and lower flanges of the tape guide of the magnetic recording / reproducing apparatus during a loading operation or the like. And the like, magnetic tape damage occurs, a step occurs in the magnetic tape winding body due to the variation of the inclination θ of the reel disk of the magnetic recording / reproducing apparatus, and a tape running load increases. The problem described above may occur.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a structure in which a gap is formed between an inner peripheral surface of a reel disk insertion hole and an outer peripheral surface of a reel disk. While increasing the diameter of the inner peripheral surface of the reel disc insertion hole,
The tape cassette is provided with a projection protruding in the center direction on the inner peripheral surface of the reel disk insertion hole so that the projection comes into contact with the outer peripheral surface of the reel disk.

[0012]

When the tape cassette according to the present invention is mounted on a magnetic recording / reproducing apparatus, the projection provided on the inner peripheral surface of the reel disk insertion hole and the reel disk are aligned in the reel axis direction. Since the point contact is made on the cross section, the reel hub does not follow the inclination of the inner peripheral surface of the reel disk and the reel hub even if the inner peripheral surface of the reel disk and the reel hub is slightly inclined. Is rotated in the reel axis direction, and the tape winding body and the reel can rotate in parallel to the reference plane.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the tape cassette of the present invention will be described with reference to the drawings. The magnetic tape cassette according to the present embodiment is substantially the same as the magnetic tape cassette 1 shown in FIG. 4 except for the gist of the present invention, and therefore has the same configuration, operation and operation. Are denoted by the same reference numerals, and description thereof is omitted.

FIG. 1 is an enlarged view of the connection between the supply-side tape winding body 5a and the supply-side reel hub 30 shown in FIG. 4 and the supply-side reel disk 10 of the magnetic recording / reproducing apparatus. FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1 in a state where the sliding sheet 11 is attached to the cassette housing 2, and FIG. 3 is a view for explaining the present invention. FIG. 2 is a sectional view similar to FIG. In the present embodiment, the reel hub and the reel disk on the winding side are the same as those on the supply side.

In the magnetic tape cassette of this embodiment, the supply reel hub 30 has a magnetic tape on the outer peripheral surface 30a.
The tape 5 is wound to form a supply-side tape wound body 5a, and a plurality of hemispherical projections 31 are formed on the inner peripheral surface 30b at the same height.
Further, the tape winding body 5a is provided at a tape center height position as viewed from the tape width direction. Diameter D3 of inner peripheral surface 30b
Is larger than the diameter of the inner peripheral surface 3b in FIG.
Inner peripheral surface 30b which is a reel disc insertion hole of the hub 30
An interval d is formed between the supply side reel disk 10 and the outer peripheral surface 10a.

As clearly shown in FIG. 2, when the supply-side reel disk 10 is inserted into the magnetic tape cassette 1, the outer peripheral surface 10a of the supply-side reel disk 10 and the projection of the supply-side reel hub 30 are formed. The supply reel hub 30 is positioned in the horizontal direction. The diameter D2 of the abutment surface at this time is the diameter D1 of the abutment surface clearly shown in FIG.
And are substantially the same.

When the magnetic tape cassette 1 is inserted into the magnetic recording / reproducing apparatus in which the supply-side reel disk 10 is inclined with respect to the reference plane, the rotating lid 8 is opened as described above, The loading means is inserted into the loading means insertion hole 9. In addition, the supply-side and take-up side reel hubs 30
When the key is released, the supply-side and take-up reel discs 10 are inserted into the reel-disc insertion holes of the supply-side and take-up reel hubs 30, and the projections of the supply-side and take-up reel hubs 30 are formed. 31 and the outer peripheral surface 10a of the supply-side and take-up side reel disks 10 abut against each other, and the engagement groove 30c of the reel hub and the claw portion 10b of the reel disk engage. By the loading operation of the loading means, the magnetic tape 5 is unwound from the magnetic tape cassette 1 and is attached to a guide drum having a built-in rotary head over a predetermined range to perform a recording / reproducing operation. Will be

During rotation of the reel disk, even if the reel disk 10 has an inclination of .theta. As shown in FIG. 3, even if the reel disk 10 has an inclination of .theta. A distance d is formed between the reel 31 and the outer surface 10a of the reel disk, and the inner surface 30b of the reel disk insertion hole is provided with a projection 31 projecting in the center direction. The outer peripheral surface 10a of the reel hub 30 makes point contact on the cross section in the reel axis direction, and the reel hub 30 rotates while rotating in the axial direction about the contact point without following the inclination of the reel disk 10. I do. Therefore, the tape winding body 5a and the reel hub 30 are guided by the sliding sheet 11 and can rotate in parallel with the cassette housing 2 and the reference plane.

In the above embodiment, a plurality of hemispherical projections are provided as the projections 31 provided on the inner peripheral surface 30b of the reel disk insertion hole. As long as the projection has a structure that makes point contact on the cross section in the reel axis direction, such as a triangular pyramid, any other projection including an annular projection may be used.

The projection 31 is provided at the tape center height when viewed from the tape width direction of the tape winding body 5a, but when sacrificing the amount of rotation in the reel axis direction. , Te
There is no provision at the center height position.

In the above-described embodiment, the magnetic tape cassette having a built-in reel without flange is described. However, the present invention is not limited to this, and a flanged reel such as a VHS (registered trademark) cassette is used. The present invention can also be implemented in a magnetic tape cassette in which is embedded.

Furthermore, although the supply-side reel and the take-up reel incorporated therein have been described with reference to the magnetic tape cassette having the same configuration, the take-up reel is a center drive and both reels are provided. The reel may have a different structure, and the present invention can be applied to a single reel built-in cartridge, cassette, or the like.

[0023]

As described above, in the tape cassette according to the present invention, a space is formed between the inner peripheral surface of the reel disk insertion hole and the outer peripheral surface of the reel disk to insert the reel disk. On the inner peripheral surface of the hole, a projection protruding in the center direction is provided,
Since the projection and the reel disk make point contact on the cross section in the reel axis direction, even if the reel disk or the like is slightly inclined, it does not follow the inclination of the reel disk or the like. Since the reel hub rotates and the tape winding body and the reel can rotate in parallel to the reference plane, there is no step in the tape winding body, and there is uneven rotation and tape. -It has the effect of reducing the running load of the tape and preventing the occurrence of magnetic tape damage.

When the projection is provided at the tape center height when viewed from the tape width direction of the tape winding body,
The amount of rotation of the tape winding body and the reel in the reel axis direction can be increased.

Further, a reel for guiding the end of the tape winding body.
When an elastic sliding sheet is provided between the cassette housing and the tape winding body without providing a tape flange, the tape winding body and the reel should be rotated more parallel to the reference plane. And the size of the tape cassette can be reduced.

[Brief description of the drawings]

FIG. 1 is an enlarged view showing a connected state of a tape wound body and a reel of a tape cassette according to an embodiment of the present invention and a reel disk of a recording / reproducing apparatus.

FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1 in a state where a sliding sheet 11 is attached to a cassette housing.

FIG. 3 is a sectional view similar to FIG. 2 for explaining the present invention.

FIG. 4 is a plan view showing a conventional example of a tape cassette.

FIG. 5 is an enlarged view showing a connected state of a tape winding body and a reel of a conventional tape cassette and a reel disk of a recording / reproducing apparatus.

FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5 in a state where a sliding sheet is attached to a cassette housing of a conventional tape cassette.

FIG. 7 is a sectional view similar to FIG. 6, illustrating a conventional tape cassette for explaining the present invention;

[Explanation of symbols]

Reference Signs List 1 magnetic tape cassette 2 cassette housing 2a upper cassette half 2b lower cassette half 3 supply reel hub (supply reel) 3a outer peripheral surface of supply reel hub 3b supply reel hub Inner peripheral surface (reel disk insertion hole) 3c Engagement groove of supply-side reel hub 4 Take-up reel hub (take-up reel) 5 Magnetic tape 5a Supply-side tape winding body 9 Loading means insertion hole 10 Supply side (winding side) reel disk 10a Supply side (winding side) reel disk outer peripheral surface 10b Supply side (winding side) reel disk claw 11 Sliding sheet 30 Supply side (winding side) reel hub 30a Supply side (winding side) reel hub outer peripheral surface 30b Supply side (winding side) reel hub inner peripheral surface (reel disk) Insertion hole) 30c Engagement groove of supply hub (rewind side) reel hub 31 Projection

Claims (3)

(57) [Claims] A built-in reel hub wound with a tape-shaped recording medium is provided at the center of the reel disc of the recording / reproducing apparatus when mounted on the recording / reproducing apparatus. In the tape cassette in which the reel is inserted by the reel disk insertion hole and the reel is rotated by the winding force of the reel disk, an interval is formed between the reel disk and the outer peripheral surface of the reel disk. The diameter of the inner peripheral surface of the reel disc insertion hole is increased, and a projection protruding toward the center is provided on the inner peripheral surface of the reel disc insertion hole, so that the reel disc insertion hole is mounted. A tape cassette characterized in that the projection and the reel disk are in point contact with each other on a cross section in the reel axis direction. 2. The tape cassette according to claim 1, wherein the projection provided on the inner peripheral surface of the reel disc insertion hole is provided at a tape center height position as viewed from the tape width direction.・ A reel provided with a reel disk insertion hole does not have a flange portion for guiding the upper end or the lower end of the tape winding body, and is provided with a cassette housing and a tape winding body. 2. The tape cassette according to claim 1, wherein an elastic sliding sheet is interposed between the tape cassette and the body.