JP2003036634A - Tape cassette - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tape cassette which can secure the proper operation of a reel lock mechanism by preventing the deformation of a cassette shell. SOLUTION: A laminated part W overlapping with a rear wall 5A of the upper shell in the front/rear direction is provided on a rear wall 6A of the lower shell 6 supporting an end part 25b of a slider spring 25. This laminated part W is constituted in such a manner that an upper end 57a of a positioning rib 57 of the slider spring 25 is protruded upward and overlapped with the inside surface of the rear wall 5A of the upper shell 5. Thus, the deformation of the rear wall 6A of the lower shell 6 at the high temperature is prevented, and the proper operation of the reel lock mechanism 22 is secured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape cassette containing a tape-shaped recording medium in a cassette shell,
More specifically, the present invention relates to a tape cassette including a reel lock mechanism that locks a pair of tape reels around which a tape-shaped recording medium is wound.

[0002]

2. Description of the Related Art A tape cassette is usually constructed by rotatably housing a pair of tape reels around which a magnetic tape as a tape recording medium is wound. Some tape cassettes of this type have a reel lock mechanism that locks the rotation of the tape reel when not in use in a recording / reproducing device (hereinafter referred to as a drive device). Even if vibration is applied to the magnetic tape, the magnetic tape is prevented from being loosened.

As shown in FIG. 12, a reel lock mechanism of this type includes a reel lock slider 101 movably supported in a front-rear direction with respect to a cassette shell, a pair of left and right blade portions 101a of the reel lock slider 101, 1
01a, a pair of reel lock pieces 103, 103 rotatably supported around supporting shafts 102, 102
And a slider spring 104 for pressing the reel lock slider 101 forward, and a pair of reel lock pieces 1
03 and 103, the reel lock spring 105 biases the tape reel 106 in a direction to engage the tape reel 106.

The reel lock piece 103 has a cylindrical portion 103.
a is externally fitted to the support shaft 102 so as to be rotatable, and the engaging claw 103b is formed on the outer peripheral edge of the tape reel 106 by the biasing force of the reel lock spring 105.
The rotation of the tape reel 106 is locked by engaging with a. The slider spring 104 is supported between the spring locking portion 101b of the reel lock slider 101 and the inner surface of the rear wall 108A of the lower shell 108 that constitutes the rear wall of the cassette shell, and biases the reel lock slider 101 forward. To act. The reference numeral 107 indicates the rear wall 1.
The positioning rib is formed to have the same height as 08A and positions the slider spring 104.

When the reel lock is released, as shown in FIG.
As shown in, by inserting the reel lock release pin R into the guide hole 101c of the reel lock slider 101, the reel lock slider 101 is moved rearward against the bias of the slider spring 104. Then, the reel lock pieces 103, 103 and the rear side piece 103
c, 103c are pressed against the inner surface of the rear wall of the cassette shell,
By rotating the reel lock pieces 103, 103 in a direction in which the engaging claws 103b, 103b approach each other,
The engagement with the tape reel 106 is released.

[0006]

The upper shell and the lower shell constituting the cassette shell are generally formed of a thermoplastic synthetic resin material from the viewpoints of weight reduction and productivity of the tape cassette. Therefore, deformation of the cassette shell or the like becomes a problem when a load larger than a predetermined value is applied or under a high temperature environment.

In the tape cassette having the reel lock mechanism, as described above, the slider spring 1 is used.
The rear wall 108A of the lower shell 108 supporting 04 is always
The slider spring 104 will receive the biasing force. Therefore, as shown in FIG. 14, the rear wall 108 of the lower shell 108, which receives the urging force of the slider spring 104, due to the storage environment of the tape cassette and the temperature increase in the drive device during the recording / reproducing operation for a long time.
A may be deformed outward with respect to the rear wall 109A of the upper shell 109. As a result, not only the cassette shell has poor dimensions and appearance, but also the slider spring 104
The urging force of the reel may fluctuate, and proper operation of the reel lock mechanism may not be obtained.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a tape cassette capable of preventing deformation of the cassette shell and ensuring proper operation of the reel lock mechanism.

[0009]

In order to solve the above problems, the present invention provides a rear wall of a lower shell that supports a slider spring with an overlapping portion that overlaps the rear wall of the upper shell in the front-rear direction. It is characterized by that.

With this configuration, since the rear wall of the lower shell is integrated with the rear wall of the upper shell via the overlapping portion, the biasing force of the slider springs can be supported by the rear walls of both shells in cooperation with each other. Is possible. As a result, the strength of the shell back wall can be increased, deformation due to the bias of the slider spring can be prevented, and proper operation of the reel lock mechanism can be ensured.

[0011]

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

1 to 3 show the entire tape cassette according to the present embodiment. The tape cassette 1 accommodates a pair of tape reels 4 and 4 in which a magnetic tape 3 as a tape-shaped recording medium is wound in a cassette shell 2 having a thin box shape so as to be rotatably separated from each other in the left and right directions. Consists of

The cassette shell 2 is formed by vertically connecting an upper shell 5 and a lower shell 6 made of a synthetic resin material such as ABS. One upper shell 5 has a top plate portion 7 serving as a main surface, and an outer wall portion 8 vertically extending from an outer peripheral edge of the top plate portion 7, and the other lower shell 6 has a bottom plate portion serving as a main surface. 9
And an outer wall portion 10 provided upright from the outer peripheral edge of the bottom plate portion 9, the outer wall portions 8 and 10 are butted against each other, and the upper shell via four screw members 38, 38 ,. The cassette shell 2 is configured by connecting the lower shell 6 and the lower shell 6 (FIG. 2).

At the front of the cassette shell 2, there is formed a mouse portion 11 which is open to the front and up and down, and the magnetic tape 3 is formed.
The tape guides 12, 12 provided on the pair of rectangular tube-shaped tape pull-out portions 2a, 2a that form the tape running area of the lower shell 6 so as to cross the front end of the mouth portion 11.
It is suspended in the middle (Fig. 3). The magnetic tape 3 that crosses the mouse portion 11 has a front lid 13 when not in use.
And the back surface is covered by the back lid portion 14.

The front lid 13 is a cassette shell 2
The back lid portion 14 is rotatably attached to a metallic slider 15 that is movably supported in the front-back direction, and the back lid portion 14 is integrally formed with the slider 15. Also,
The front lid 13 is constantly urged by the lid spring 36 in the direction of closing the mouse portion 11 (covering the front surface of the magnetic tape 3), and the closed position is locked by the lid lock member 37 so that the mouse portion 11 is closed. It is designed so that it cannot be opened carelessly (see Fig. 1).

The slider 15 has a horizontally long substantially rectangular upper surface portion 40, side surface portions 41 and 41 extending from the rear half portions of the left and right side edges of the upper surface portion 40, and the front half portions of the left and right side edges of the upper surface portion 40. Lid supporting portions 42, 42 hung from the
The back lid portion 14 vertically extending from the front edge of the upper surface portion 40 is integrally formed (FIG. 1).

The lower end portions of the side surface portions 41, 41 are bent inward in a U-shaped cross section to form guide grooves 44, 44, and the guide wall 4 is provided so as to extend vertically from both left and right edges of the upper shell 5.
It engages with the lower ends 43a, 43a of 3, 43. The lid support portions 42, 42 are provided with support grooves 47, 47 for supporting the rotation fulcrum shafts 46, 46 projectingly provided on the inner surfaces of the supported portions 45, 45 of the front lid 13, and behind them. On the side, hook portions 51, 51 that are bent inward in a substantially U-shape and engage with linear guide rails 50, 50 formed on the inner surface of the upper shell 5 are provided.

The back lid portion 14 is formed to be slightly smaller than the left and right widths of the mouth portion 11, and the lower end portion thereof is folded back approximately 180 degrees,
It is configured as a bulging portion 52 which bulges a predetermined amount to the front side. Both ends 53 of the bulging portion 52 are crushed rearward.

The tape reels 4, 4 have upper flanges 16,
16 and a lower flange 1 that is integral with the reel hubs 17 and 17
It is a combination with 8 and 18. One end of a transparent leader tape 19 is fixed to the reel hub 17 via a clamper 20. The other end of the leader tape 19 is joined to the end of the magnetic tape 3 via a splice tape 21, and is wound around the reel hub 17 as a continuous tape body.

The tape reels 4 and 4 are urged toward the lower shell 6 by a reel pressing spring 27 fixed to the inner surface of the top plate portion 7 of the upper shell 5, and inside the cassette shell 2 when the tape cassette 1 is transported. Rattling is suppressed. A transparent window member 28 is attached to the top plate portion 7 so that the winding appearance of the magnetic tape 3 inside the cassette shell 2 can be visually confirmed.

On the other hand, a tape end detecting section 29 is provided in the front center of the lower shell 6. The tape end detection unit 29 is for detecting the end of the magnetic tape 3, and is a tube that defines an opening (not shown) through which a detection light source on the drive device side is inserted and a space that houses the light source. It is provided with a shape part 31 and a dustproof cap 39 for preventing foreign matter from entering the inside of the cassette shell 2 through the opening.

Since the transparent leader tape 19 is connected to the end of the magnetic tape 3, the light emitted from the light source for detection passes through the leader tape 19 delivered to the tape running area and is transferred to the lower shell 6. The detection windows 32, 32 opened laterally are reached. Therefore, by arranging a light receiving sensor in the detection windows 32, 32, the end of the magnetic tape 3 is detected, and thereby the rotational drive control of the tape reel 4 is performed.

Further, the outer wall portion 10 on the right rear side of the lower shell 6
A safety tab 33 for preventing erroneous recording and erasing of the information signal recorded on the magnetic tape 3 is attached to the inside (FIG. 4). The safety tab 33 is configured so as to selectively take a recordable position and a recordable position. The color tab 34, which is integrally attached to the safety tab 33, is exposed to the outside when the safety tab 33 is in a non-recordable position, and the formed color (for example, red) is recognized from the outside. .

Further, the outer wall portion 10 on the left rear side of the lower shell 6
A memory substrate 35, in which a non-contact type IC (semiconductor integrated circuit) memory is mounted, is housed inward, and by communication with the drive device side, for example, reading and writing of information regarding the contents recorded on the magnetic tape 3 is performed. It is like this.

Next, the reel lock mechanism 22 will be described with reference to FIGS.

The reel lock mechanism 22 includes a reel lock slider 23 that is movably supported in the front-rear direction with respect to the cassette shell 2, and a support shaft that is erected on a pair of left and right wings 23a, 23a of the reel lock slider 23. 30, 3
A pair of reel lock pieces 24, 24 supported rotatably around 0, a slider spring 25 for pressing the reel lock slider 23 forward, and a pair of reel lock pieces 24, 24 for the tape reels 4, 4. Engaging teeth 18
and a reel lock spring 26 for urging in the direction of engaging with a and 18a.

The reel lock slider 23 has a pair of guide ribs 61, 6 extending on the bottom plate 9 of the lower shell 6.
1 (FIGS. 1 and 5), and these guide ribs 6 are provided.
The forward and backward movement is guided by 1, 61. In addition, a guided protrusion 23b arranged between a pair of guide ribs 59 (FIG. 6) extending on the top plate portion 7 of the upper shell 5 is provided on the upper portion of the reel lock slider 23, and a guided protrusion 23b is provided on the bottom portion thereof. Insertion hole 6 opened between the guide ribs 61 on the shell 6 side
There is provided a guide hole 63 into which the reel lock release pin R in the drive device that advances and retracts via 2 (FIGS. 1 and 6) is inserted. A portion of the guide hole 63 that abuts on the reel lock release pin R is provided with a taper surface 63a, and as the reel lock release pin R moves upward, the reel lock slider 23 moves to the left side in FIG. It is like this.

The reel lock slider 23 is pushed forward by an urging force of a slider spring 25, which will be described later, but it is erected in front of the guide ribs 61, 61 by a stopper 60 having a substantially V-shaped cross section. The front position of the reel lock slider 23 is restricted (FIG. 5).

The slider spring 25 comprises a coil spring, one end 25a on the small diameter side is locked to the spring receiving portion 56 on the rear side of the reel lock slider 23, and the other end 25b on the large diameter side is the inner surface of the rear wall 2b of the cassette shell 2. Is locked to.

Here, the spring receiving portion 56 of the reel lock slider 23, which has a substantially U-shaped cross section, is provided with retaining projections 56a to 56c for preventing the one end 25a on the small diameter side of the slider spring 25 from coming off. (FIGS. 6-8). That is, the retaining projections 56a to 56c in the present embodiment include a pair of claw portions 56a and 56b protruding substantially parallel to the biasing direction of the slider spring 25,
The slider spring 25 is composed of a pair of ribs 56c, 56c that project substantially perpendicularly to the biasing direction of the slider spring 25.

The one claw portion 56b locks the inner edge portion of the slider spring 25, and the other claw portion 56a is located above the claw portion 56b (FIGS. 6 and 8). Also,
The pair of ribs 56c, 56c are used for the slider spring 2
5 are provided so as to enter the inside of the housing 5 and face each other (FIGS. 7 and 8).

On the other hand, the slider spring 25
The other end 25b on the large diameter side is positioned by a pair of positioning ribs 57, 57 extending vertically on the inner surface of the rear wall 6A of the lower shell 6. Of this rear wall 6A, a portion 6A1 where the positioning ribs 57, 57 are formed is formed so as to project toward the upper shell 5 side more than other portions 6A2.
The height is such that only the lower shell 6 side can support the other end 25b on the large diameter side of the slider spring 25.

Upper ends 57a, 5 of the positioning ribs 57, 57
As shown in FIG. 6, 7a projects upward from the rear wall 6A by a predetermined distance and overlaps the rear wall 5A of the upper shell 5 in the front-rear direction.
The rear wall 5A of the upper shell 5 facing the upper ends 57a, 57a of the
The overlapping portion W according to the present invention is formed in cooperation with the region of FIG.

Next, the reel lock pieces 24, 24 project from the cylindrical portions 24b, 24b having through holes 24a, 24a into which the support shafts 30, 30 are fitted, and the circumferential surfaces of the cylindrical portions 24b, 24b, and the tape reel. Engaging claws 24c, 24c engageable with the engaging teeth 18a, 18a of 4, 4, and cylindrical portions 24b, 24b.
The rear side pieces 24d and 24d which project in the direction substantially opposite to the engaging claws 24c and 24c from the peripheral surface of are integrally formed (FIG. 9).

The engaging claws 24c, 24c have a slightly curved shape so that the tips thereof face outward, and the engaging projections (not shown) provided on the bottom of the reel lock slider 23 are provided at the bottom thereof. Engageable hook portions 24e, 24e are integrally formed. The hook portions 24e, 24e are provided in order to integrate the reel lock pieces 24, 24 with the reel lock slider 23 and the lower shell 6 when the reel lock pieces 24, 24 are integrated with each other, and to improve the assembling workability. There is.

On the other hand, on the upper portions of the rear side pieces 24d, 24d,
An arm portion 26 of a reel lock spring 26 described later.
spring locking portions 24f, 24f for locking c, 26c
Is provided above the spring engaging portions 24f, 24f, and retaining claws 24g, 24g for integrally retaining the arm portions 26c, 26c are integrally formed.

Next, the reel lock spring 26 has a pair of coil portions 26a, 26 fitted into the support shafts 30, 30.
a, a bridging portion 26b connecting these coil portions 26a, 26a, and a pair of arm portions 26c, 26c projecting in the tangential direction of the coil portions 26a, 26a are integrally formed of a torsion spring. , Arm portions 26c, 2
The tip of 6c is bent downward so that the reel lock pieces 24, 2
4 is locked to the spring locking portions 24f and 24f (FIGS. 5, 7, and 8). As a result, the reel lock pieces 24, 2
The four engaging claws 24c, 24c are urged in a direction in which they are separated from each other, and an engaging force with the engaging teeth 18a, 18a of the tape reels 4, 4 is generated.

Now, each component of the reel lock mechanism 22 constructed as described above is assembled as follows.

The pair of reel lock pieces 24, 24 are fitted in the left and right support shafts 30, 30 of the reel lock slider 23, respectively, and then the engaging claws 24c, 24c are rotated in the direction of approaching each other. The hooks 24e, 24
e is engaged with the engaging projections (not shown) on the bottoms of the wings 23a and 23a to integrate them. The reel lock spring 26
After the coil portions 26a, 26a are fitted onto the support shafts 30, 30 from above the reel lock pieces 24, 24, the arm portions 26
c and 26c are spring lock portions 2 of the reel lock pieces 24 and 24.
It is locked to 4f and 24f. As described above, the reel lock slider 23, the pair of reel lock pieces 24, 24, and the reel lock spring 26 are integrated.

Next, the slider spring 25 is integrated by engaging one end 25a on the small diameter side thereof with the spring receiving portion 56 of the reel lock slider 23.
That is, referring to FIGS. 6 and 7, one end 25 a of the slider spring 25 is connected to the claw portion 56 a of the spring receiving portion 56.
And the ribs 56c, 56c, and is pushed downward so as to get over the claw portion 56b. Then, the inner diameter side edge portion of the one end 25a of the slider spring 25 is locked by the claw portion 56b, and the pair of ribs 56c, 56c enter the inside of the slider spring 24 and are positioned between the spring wires.

As a result, the slider spring 25
Allows the spring receiving portion 56 to be prevented from coming off in the vertical direction by the claw portions 56a and 56b.
Since 56c provides a retaining action in the front-rear direction, it is integrated with the reel lock slider 23.

The reel lock mechanism 22 unitized as described above is arranged in the space between the inner surface of the rear wall 6A of the lower shell 6 and the tape reels 4, 4. At this time, the other end 25b on the large diameter side of the slider spring 25 is attached to the rear wall 6A.
Positioning ribs 57 regulate the position in the left-right direction. Further, since the formation portion 6A1 of the positioning rib 57 on the rear wall 6A is formed higher than the other portion 6A2, the slider spring 25 is attached to the rear wall 6 of the lower shell 6.
Since the end 25b of the slider spring 25 supported only by A is supported and has a large diameter, the slider spring 25 can be seated well and the reel lock mechanism 22 can be assembled.

When the upper shell 5 and the lower shell 6 are coupled, the outer wall portion 8 of the upper shell 5 and the outer wall portion 10 of the lower shell 6 are butted against each other and integrated (FIGS. 2 to 4). At this time, the upper ends 57a, 57a of the positioning ribs 57, 57 formed on the inner surface of the rear wall 6A of the lower shell 6 overlap the inner surface of the rear wall 5A of the upper shell 5 to form the above-mentioned overlapping portion W.

Next, the operation of the tape cassette 1 configured as described above will be described focusing on the operation of the reel lock mechanism 22.

When the tape cassette 1 is not used, the reel lock mechanism 22 has the reel lock pieces 2 on the engaging teeth 18a, 18a of the tape reels 4, 4 as shown in FIGS. 5 and 10A.
The engaging claws 24c and 24c of the tape reels 4 and 24 are engaged with each other to lock the rotation of the tape reels 4 and 4. This prevents winding looseness of the magnetic tape 3 when not in use.

On the other hand, when the tape cassette 1 is loaded into the drive device, the reel lock release pin R enters the guide hole 63 (FIG. 6) of the reel lock slider 23 through the insertion hole 62 of the lower shell 6, and the taper is tapered. The upward movement of the reel lock release pin R is converted into the backward movement of the reel lock slider 23 by the surface 63a. Then, the rear side pieces 24d, 24d of the reel lock pieces 24, 24 come into contact with the inner surface of the rear surface wall 2b of the cassette shell 2, whereby the engaging claw 2
The reel lock pieces 24, 24 rotate around the support shafts 30, 30 in a direction in which the 4c, 24c approach each other (see FIG. 1).
0B).

Through the above operations, the reel lock mechanism 22
The rotation lock of the tape reels 4 and 4 is released by, and the magnetic tape 3 is loaded across the mouse portion 11 opened by the opening operation of the front lid 13 (FIG. 3).

Therefore, in the present embodiment, the temperature inside the drive device rises due to the recording / reproducing operation for a long time,
Even if the rear wall 6A of the lower shell 6 supporting the slider spring 25 tries to deform outward, the positioning rib 57,
The upper ends 57a, 57a of 57 press the inner surface of the rear wall 5A of the upper shell 5, and the rear walls 5A, 6A of both shells 5, 6 receive the biasing force of the slider spring 25 as a whole.
Thereby, the strength of the rear wall 2b of the cassette shell 2 is increased, the outward deformation resistance of the rear wall 5A of the lower shell 5 is increased, and the rear wall 5A is prevented from being deformed by the biasing of the slider spring 25. You can Further, the biasing force of the slider spring 25 is stabilized and the reel lock mechanism 2
It is possible to ensure the proper operation of 2.

On the other hand, from the drive unit to the tape cassette 1
Is discharged, the reel lock release pin R is pulled out from the guide hole 63 of the reel lock slider 23, and the reel lock slider 23 advances due to the urging force of the slider spring 25 and contacts the stopper 60 to regulate the forward position. It At the same time, the reel lock pieces 24, 24 receive the biasing force of the reel lock spring 26, and the engaging claw 2
4c and 24c rotate in the direction in which they are separated from each other, and the engaging claw 2
4c and 24c are engaging teeth 18a and 1 of the tape reels 4 and 4, respectively.
8a is engaged. This completes the rotation lock of the tape reels 4 and 4.

Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made based on the technical idea of the present invention.

For example, in the above embodiment, the upper ends 57a, 57 of the positioning rib 57 of the slider spring 25 are arranged.
Although a is configured as the overlapping portion W according to the present invention, instead of this, for example, as shown in FIG. 11, both ends of the rear wall 6A1 ′ of the lower shell 5 and the rear wall of the upper shell 5 combined therewith are combined. It is also possible to form the end portions of 5A ′ as tapered surfaces that are in contact with each other, and configure these as overlapping portions W ′ and W ′. In this case, the positioning rib 57 ',
Even if 57 'is formed at the same height as the rear wall 6A1', the rear wall 6
The deformation of A1 can be regulated by the rear wall 5A of the upper shell 5 via the overlap failure W'and W '.

[0052]

As described above, according to the tape cassette of the present invention, it is possible to increase the strength of the back wall of the shell and prevent the slider spring from being deformed by the bias of the slider spring. The operation can be secured.

According to the second aspect of the present invention, the assemblability of the slider spring to the cassette shell can be improved. According to the third aspect of the present invention, the slider spring can be seated well to ensure stable operation of the reel lock mechanism.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a configuration of a tape cassette according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the entire tape cassette according to the embodiment of the present invention, showing a state in which the front lid is closed.

FIG. 3 is a perspective view showing an entire tape cassette according to the embodiment of the present invention, showing a state in which a front lid is opened.

FIG. 4 is a perspective view showing the back side of the tape cassette according to the embodiment of the present invention.

FIG. 5 is a perspective view showing a configuration of a reel lock mechanism according to the embodiment of the present invention.

FIG. 6 is a side sectional view showing a configuration of a main part of the reel lock mechanism according to the embodiment of the present invention.

FIG. 7 is a plan view of the reel lock mechanism according to the embodiment of the present invention.

FIG. 8 is a rear view of the reel lock mechanism according to the embodiment of the present invention, showing a state in which the reel lock piece is rotated by a predetermined amount from the state shown in FIG. 7.

FIG. 9 is a perspective view showing the relationship between the reel lock slider and the reel lock piece of the reel lock mechanism in the embodiment of the present invention.

FIG. 10 is a plan view of relevant parts for explaining the operation of the reel lock mechanism according to the embodiment of the present invention, in which A shows a reel lock state and B shows a reel lock release state.

FIG. 11 is a cutaway plan view of an essential part showing a modified example of the embodiment of the present invention.

FIG. 12 is a perspective view showing a configuration of a reel lock mechanism in a conventional tape cassette.

FIG. 13 is a side sectional view of a main part of a reel lock mechanism of a conventional tape cassette.

FIG. 14 is a diagram illustrating a problem of the conventional technique.

[Explanation of symbols]

1 ... tape cassette, 2 ... cassette shell, 3 ... magnetic tape, 4 ... tape reel, 5 ... upper shell, 5A ... rear wall,
6 ... Lower shell, 6A, 6A1, 6A2 ... Rear wall, 22 ... Reel lock mechanism, 23 ... Reel lock slider, 24
… Reel lock piece, 25… Slider spring, 26
... reel lock spring, 30 ... support shaft, 57 ... positioning rib, 57a ... upper end (overlapping portion), R ... reel lock release pin.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroshi Fujii             6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Soni             -Inside the corporation (72) Inventor Takaaki Sanbe             6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Soni             -Inside the corporation

Claims (3)

[Claims] 1. A cassette shell formed by combining an upper shell and a lower shell, a pair of tape reels rotatably housed in the cassette shell and wound with a tape-shaped recording medium, and a pair of tape reels. And a reel lock mechanism arranged in a space between the inner surface of the back wall of the cassette shell and locking the rotation of the tape reel, and the reel lock mechanism is movably supported in the front-rear direction. A pair of left and right reel lock pieces rotatably supported with respect to the reel lock slider, and one end supported by the reel lock slider,
A tape having a slider spring, the other end of which is supported on the inner surface of the rear wall of the lower shell forming the back wall, and a reel lock spring for urging the pair of reel lock pieces in a direction to engage the tape reel. The tape cassette, wherein a rear wall of the lower shell is provided with an overlapping portion that overlaps the rear wall of the upper shell in the front-rear direction. 2. A pair of positioning ribs for vertically positioning the other end of the slider spring are vertically extended on an inner surface of a rear wall of the lower shell, and an upper end of each of the pair of positioning ribs is provided on the lower side. 2. The tape cassette according to claim 1, wherein the overlapping portion is formed so as to project from the upper end of the rear wall of the shell to the upper shell side, and to form the overlapping portion with the inner surface of the rear wall of the upper shell. 3. The tape according to claim 2, wherein a portion of the rear wall of the lower shell that supports the slider spring is formed so as to project toward the upper shell more than other portions. cassette.