JP3360149B2 - Tape cartridge - 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 cartridge having a front cover, an upper cover and a back cover for opening and closing a tape loading pocket, and particularly to taking measures against dust.

[0002]

2. Description of the Related Art A tape cartridge of this type is known, for example, from Japanese Patent Application Laid-Open No. 57-210489. There, a tape loading pocket, such as an 8 mm video tape cartridge, is opened and closed by a double lid: a front lid that covers the front side of the tape and a back lid that covers the back side of the tape. In addition to the front lid and back lid, the front lid and back lid are also provided with an upper lid that opens and closes the upper surface of the pocket in conjunction with it, and the addition of this lid increases the amount of opening of the front lid and back lid. ing. The applicants have also previously proposed a tape cartridge having a front lid, an upper lid and a back lid (Japanese Patent Application No. 5-154).
268).

[0003]

The problem here is that the front lid, the back lid and the upper lid are connected to each other so that they can be bent freely. In this case, the connecting portion between the front lid and the upper lid, and the upper lid and the back lid are connected. A gap is formed in each of the connecting portions with the dust, and the dust easily enters through the gap, and there is a concern that the function of protecting the tape from dust adhesion by the front lid, the back lid, and the upper lid may be reduced. In particular, in the above-mentioned proposal previously proposed by the present applicant, as shown in FIG.
Is pivotally connected between left and right bearings 40 provided on the inner surface side of the upper lid 11 so as to be rotatable around a pivot 41.
1 and the upper end 10a of the back cover 10, there is a gap for securing the rotation of the back cover 10, and since the gap is in an open state, dust entering from below the pocket 6 is There is a problem in that it easily enters through the gap and adheres to the tape 2. SUMMARY OF THE INVENTION An object of the present invention is to provide a tape cartridge having a front lid, an upper lid and a back lid as described above, in which the inner surface of the upper lid and the upper end of the back lid are improved by improving the pivot connection structure of the upper lid and the back lid. Another object of the present invention is to prevent dust from intruding from between the mating surfaces and to achieve complete protection of the tape.

[0004]

As shown in the drawing, a tape cartridge which is the premise of the present invention has upper and lower surfaces and a front surface opened on the front side of a main body case 1 containing a reel 3 on which a tape 2 is wound. The front cover 9 covering the front surface of the lead-out portion 2a of the tape 2 led to the pocket 6 is turned around the turning shaft 14 so as to open and close the front side of the pocket 6 in the main body case 1. An upper lid 11, which is freely supported and opens and closes the upper surface of the pocket 6 in conjunction with opening and closing of the front lid 9, has a front end 19a pivotally connected to an upper end 12a of the front lid 9 so as to be rotatable. The tape 2 linked to the opening and closing of
Cover 10 that covers the back side of lead-out portion 2a of
0 a is pivotally connected to the front and rear intermediate portion of the inner surface of the upper lid 11 so as to be rotatable.

[0005] In addition, the present invention provides a back cover 10 and an upper cover 1.
At the pivotal connection with the back cover 1, a back cover holding wall 27 is integrally and downwardly projected from the front and rear intermediate portion of the inner surface of the upper cover 11 so as to be continuous in the left-right direction. Bifurcated arms 29, 29 provided on the left and right ends of upper end 10a
The back cover holding wall 27 and the left and right forked arms 2
9 and 29 are rotatably connected to each other around a pivot 31. The lower end of the back cover holding wall 27 is covered between the forked arms 29 and 29 of the upper end 10a of the back cover 10. The wrapping wall piece 32 is provided in the left-right direction. Its back cover holding wall
The lower peripheral surface of the lower end of 27 is formed in an arc shape.
The wrapping wall piece 32 at the upper end 10a of the lid 10 is as shown in FIG.
Especially, it is formed in the shape of projecting back and forth in the thickness direction of the back cover 10.
ing.

[0006]

When not in use, the tape 2 in the pocket 6 is covered with the front cover 9 on the front side, the upper cover 11 on the upper end side, and the back cover 10 on the back side. At this time, top cover 1
1 and the upper end 10a of the back cover 10 are closed by a back cover holding wall 27, and between the lower peripheral surface of the lower end of the lower cover holding wall 27 and the upper end 10a of the back cover 10. A minute gap is formed to secure the rotation of the back cover 10, but the gap is detoured inward and outward by the wrapping wall piece 32 (bypassing) to form a curved passage, thereby suppressing dust intrusion from the place. it can.

[0007]

1 to 4 show an embodiment of a tape cartridge according to the present invention. This tape cartridge is for a video. As shown in FIGS. 2 and 3, the main body case 1 has a plastic upper and lower case 1a.
1b, and a pair of left and right reels 3 around which the tape 2 is wound are rotatably provided in the inside. The tape 2 pulled out from one of the reels 3 is guided by tape guides 5 provided at the left and right tape outlets 4 on the front of the main body case 1 and wound on the other reel 3. The center of the front of the main body case 1, that is, the left and right tape outlets 4
-There is a pocket 6 for tape loading between the four. The pocket 6 has upper and lower surfaces and a front surface open. The leading portion 2a of the tape 2 led out to the front side of the main body case 1 has a plastic front lid 9 and a back lid 10 when not in use.
And the upper lid 11 respectively.

As shown in FIGS. 1 and 3, the front lid 9
Principal plate 1 that closes the front of pocket 6 and tape outlet 4
2 and a side plate 13 integrally connected from the left and right ends of the main face plate 12 toward the rear of the case. Left and right side plates 1
3, a rotating shaft 14 is protruded from each inner surface.
The rotating shaft 14 is rotatably fitted into each shaft hole 16 of the left and right side walls 15 of the main body case 1. Thereby, the front lid 9
Are the left and right tape outlets 4 as shown by the solid line in FIG.
It can be freely opened and closed around the left and right rotation shafts 14 between a position where the front surface of the pocket 4 and the front surface of the pocket 6 are closed and an upper open position indicated by a two-dot chain line in FIG. The front lid 9 is provided with a spring member 17 fitted to one of the left and right rotation shafts 14 (see FIG. 3).
, It is always urged to rotate in the closing direction.

An upper lid 11 for opening and closing the upper surface of the pocket 6 is pivotally connected to the front lid 9. As shown in FIGS. 1 and 3, the upper lid 11 includes a main surface plate 19 that covers the upper surface of the pocket 6 so as to cover above the lead-out portion 2 a of the tape 2, and a side surface plate 20 that extends downward from both left and right ends of the main surface plate 19. The slide shaft 21 protrudes from the inner surface of the rear end of each of the left and right side plates 20. The upper lid 11 closes the upper surface of the pocket 6 as shown by a solid line in FIG. 1 in accordance with the opening / closing operation of the front lid 9, and an open position in which the upper surface of the pocket 6 retreats backward as shown by a two-dot chain line in FIG. Open and close freely. For this purpose, as shown in FIG. 3, the upper lid 11 is provided with a pair of left and right forked arms 23 having a pivot 22 at both left and right ends of a front end portion 19a of the main face plate 19, and the front lid 11 is provided between the two forked arms 23. 9, an upper end 12a of an arc-shaped cross section formed at the upper end of the shaft 9, and the pivot shafts 22 are provided at both left and right end surfaces of the upper end 12a.
To be rotatably supported about the pivot 22. Also, as shown in FIG.
Is slidably engaged with a guide groove 25 in the shape of a letter "H" provided on each outer surface of the left and right side walls 15 of the main body case 1.

When the front lid 9 and the upper lid 11 are closed, dust is prevented from entering between the mating surfaces of the front end 19a of the upper lid 11 and the upper end 12a of the front lid 9, as shown in FIGS. As shown, the left and right forked arms 23 of the upper lid 11
The front end 19a between the upper end 12 and the upper end 12 of the front lid 9 having an arc-shaped cross section.
A covering wall piece 26 having an arc-shaped cross section (substantially semi-cylindrical shape) is provided to cover the inside of the peripheral surface of a in the left-right direction. By providing the wrapping wall piece 26 in this manner, the front end portion 19a of the upper lid 11 is provided.
When a small gap is formed between the mating surfaces of the front lid 9 and the upper end portion 12a of the front lid 9, the gap goes as far as possible inward and outward,
The curved passage makes it difficult for dust to enter through the gap.

As shown in FIG. 1, the back cover 10 is in a closed position for covering the back side of the tape 2 in the pocket 6 as shown by a solid line in FIG. As shown by the two-dot chain line, the pocket 6 is openable and closable over an open position overlapping the lower side of the upper lid 11 in the open state behind the upper surface of the pocket 6. For this purpose, as shown in FIGS. 1 and 3, the back lid 10 is pivotally connected at its upper end to a front-rear intermediate portion on the inner surface of the upper lid 11, and is rotatably supported.
Legs 33 are provided on the left and right of the lower rear surface of the pocket 0, and slide pins 34 provided on each of the right and left legs 33 are slidable in "J" -shaped guide grooves 35 provided on the left and right side walls in the pocket 6, respectively. Engages.

In this case, as shown in FIG. 3 and FIG. 4, from the front and rear middle part of the inner surface of the upper cover 11 so as to prevent dust from entering from between the inner surface of the upper cover 11 and the upper end 10a of the back cover 10. The back cover holding wall 27 is integrally protruded downward so as to be continuous without being interrupted in the left and right direction, and on the left and right ends of the upper end 10a of the back cover 10, two forked arms 29 are provided. The back cover holding wall 27 is sandwiched between the two 29, and the two 27 and 29 are pivotally connected around the pivot 31.

The pivoting structure is shown in FIG.
A shaft hole 30 is provided on each of the left and right end surfaces of the shaft hole 30.
30 are fitted with pivots 31 provided on the left and right forked arms 29 so as to face each other. Alternatively, although not shown, on the contrary, pivots 31 are provided on the left and right end surfaces of the back cover holding wall 27, respectively, and the pivots 31 are fitted into the shaft holes 30 provided in the left and right forked arms 29, 29, respectively. Can also. Instead of providing the pivot 31 integrally with the back cover holding wall 27 or the fork arm 29, a separate member can be passed through the back cover holding wall 27 and the fork arm 29.

The forked arm 2 at the upper end 10a of the back cover 10
9 between-29, provided in the form of envelope wall piece 32 of the peripheral surface lower portion of the lower encapsulating of the back cover holding wall 27 across the left-right direction. More specifically, the back cover holds the wall 27 as shown in FIG. 5
The lower part of the lower peripheral surface of the lower cover is formed in an arc shape,
Envelope wall piece 32 of the upper end portion 10a of that are formed in the shape protruding after prior <br/> in the thickness direction of the back cover 10. The back cover 1
The extension length of the wrapping wall piece 32 forward in the thickness direction of 0 is
The forward extending end of the envelope wall piece 32 before fully opening the rear cover 10 is kept kept so as not supporting the inner surface of the upper lid 11 of course.

In the closed state of the back cover 10 and the upper cover 11, the space between the inner surface of the upper cover 11 and the upper end 10a of the back cover 10 is closed by a back cover holding wall 27 integrally protruding downward from the inner surface of the upper cover 11. Can come off. Although a small gap is formed between the lower peripheral surface of the back cover holding wall 27 and the wrapping wall piece 32, the lower peripheral portion of the lower end of the back cover holding wall 27 is covered with the wrapping wall piece 32. Therefore, the gap goes as far as possible inward and outward so as to form a curved passage. Therefore, dust entering from below the pocket 6 or from between the overlapping surfaces of the upper lid 11 and the upper wall of the main body case 1 is exposed to the tape 2 in the pocket 6 from between the inner surface of the upper lid 11 and the upper end 10a of the back lid 10. It is difficult to invade the place where there is. As shown in FIG. 1, a concave portion 36 is provided on the inner surface of the lower end portion of the main face plate 12 of the front lid 9, and the lower end portion of the back lid 10 is abutted against the concave portion 36, thereby preventing dust from entering therefrom.

[0016]

As described above, according to the present invention, between the inner surface of the upper cover 11 and the upper end 10a of the back cover 10, the back cover holding wall 27 is suspended from the inner surface of the upper cover 11 in the left-right direction. The back cover holding wall 27 is sandwiched between the forked arms 29 and 29 provided at the left and right ends of the upper end 10a of the back cover 10, and the back cover holding wall 27 and the left and right The bifurcated arms 29 are pivotally connected to each other around a pivot 31 and the lower peripheral surface of the lower end of the back cover holding wall 27 is attached to the bifurcated arms 29 of the upper end 10a of the back cover 10.
It was wrapped by the wrapping wall piece 32 provided therebetween. That
At this time, the lower part of the peripheral surface of the back cover holding wall 27 is formed in an arc shape,
The wall piece 32 is, as shown in FIG.
Formed in the shape of overhang. Therefore, these upper lids 11
Dust penetrates from between the inner surface of the case and the upper end 10a of the back cover 10.
Thus, the dust can be prevented from adhering to the tape 2, and the dustproof effect of the upper lid 11 and the back lid 10 can be further enhanced, and the reliability is excellent.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along line AA in FIG.

FIG. 2 is a perspective view of the entire appearance.

FIG. 3 is an exploded perspective view showing a state where a front cover, an upper cover, and a back cover are separated.

FIG. 4 is a perspective view showing a main part of a back cover and an upper cover separated from each other.

FIG. 5 is a sectional view of a main part showing another embodiment.

FIG. 6 is a sectional view of a main part of a comparative example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body case 2 Tape 3 Reel 6 Pocket 9 Front lid 10 Back lid 11 Upper lid 14 Rotation axis 27 Back lid holding wall 29 Bifurcated arm 31 Axis 32 wrapping wall piece

Continuing from the front page (72) Inventor Noriaki Masuda 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Hitachi Media Research Laboratory, Inc. (72) Inventor Hidekazu Takeda 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Hitachi, Ltd. (56) References JP-A-4-42484 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 23/087 524

Claims (1)

(57) [Claims] 1. A main body case (1) having a reel (3) wound with a tape (2) therein is provided on its front side with a pocket (6) whose top and bottom surfaces and a front surface are open. A front cover 9 that covers the front surface of the lead-out portion 2a is rotatably supported on the main body case 1 around a rotation shaft 14 so as to open and close the front side of the pocket 6. An upper lid 11 for opening and closing the upper surface of the front cover 6 is pivotally connected at its front end 19a to an upper end 12a of the front lid 9 so as to be rotatable. The back lid 10 covering the back side of the tape cartridge has its upper end 10a pivotally connected to the front and rear intermediate portion of the inner surface of the upper lid 11 so as to be pivotally connected. In the upper lid 11
A bifurcated arm having a rear cover holding wall 27 integrally and downwardly projecting from the front and rear intermediate portion of the inner surface thereof so as to be continuous in the left-right direction, and provided at the left and right ends of the upper end portion 10a of the back cover 10. 29 and 29, and the back cover holding wall 27
And the left and right forked arms 29, 29 are rotatably connected to each other around a pivot 31. A peripheral surface of a lower end of the back cover holding wall 27 is provided between the forked arms 29, 29 of the upper end 10a of the back cover 10. Encapsulation wall piece 3 that covers the lower part
2 Ri nitrous provided over the left and right directions, the peripheral surface lower portion of the lower end of the back cover holding wall 27, is formed in an arc shape
And the wrapping wall piece 32 at the upper end 10a of the back cover 10
Tape cartridge characterized that you have been formed in the shape protruding to the front and rear plate thickness direction.