JPH07296557A - Tape cassette - Google Patents

Abstract

PURPOSE:To ensure a click feeling and locking by providing an elastic member for elastically pressing a plug engaging part in the direction of a click groove corresponding to a plug opening/closing position for preventing erroneous erasure. CONSTITUTION:A plug 16 for preventing erroneous erasure is housed in the plug housing part 17 of a cassette housing. When the movement of the plug 16 is operated from an operation window 5, the plug 16 opens and closes a erroneous erasure prevention detecting hold 8. A positioning rib 18 is provided with groove-shaped engaged parts 29a and 29b in the position corresponding to the opening/closing position of the plug 16. An engaging part 16b is provided on the plug 16 and is engaged with the engaged parts 29a and 29b in respective opening/closing positions to realize the click feeling of a movement operation and the locking of the opening/closing positions. A click member 22 made of plastics is elastically supported by forcedly inserting a slit 23 into a supporting rib 19. The click member 22 always acts as an elastic member for pressing the engaging part 16b to the parts 29a and 29b to be engaged with its elasticity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention enables / disables information recording on an information recording tape housed in a cassette housing by moving an erroneous erasure prevention plug from an operation window to open / close an erroneous erasure prevention detection hole. The present invention relates to a tape cassette capable of identifying the above state, and particularly to a plug structure for giving a click feeling when moving an erroneous erasure prevention plug.

[0002]

2. Description of the Related Art Conventionally, as a tape cassette provided with this kind of erroneous erasure prevention plug, for example, there are those shown in FIGS. FIG. 9 is a cross-sectional view showing a part of a rear side of a conventional 8 mm video cassette used in an 8 mm video camera and a conventional audio cassette used in a digital audio tape recorder (hereinafter referred to as "DAT"). FIG. 10 is a cross-sectional view showing the principal part of FIG. 9 in the front-rear direction, and FIG.
FIG. 11 is a sectional view taken along line BB of FIG. 10.

In FIGS. 9 to 11, reference numeral 1 is a cassette housing, and the cassette housing 1 is composed of a pair of upper and lower halves 2 and 3 which are superposed on each other. An operation window 5 is provided on one side of the back label attaching surface 4 which is the back surface of the cassette housing 1. The operation window 5 is provided with an erroneous erasure prevention plug 6
It can be opened and closed by the operation unit 6a. The erroneous erasure prevention plug 6 is slidably accommodated in a plug accommodating portion 7 provided inside the operation window 5, and the erroneous erasure prevention detecting hole 8 is formed on the lower surface of the lower half 3 in relation to the plug accommodating portion 7. Is opened. The erroneous erasure prevention detection hole 8 can be opened and closed by an erroneous erasure prevention plug 6 which is moved from the operation window 5.

In order to perform this movement operation, the accidental erasure prevention plug 6 is provided with an operation claw 9 protruding into the operation window 5, and a person hooks the operation claw 9 with a fingernail to move the operation. The operation of moving the erroneous erasure prevention plug 6 is basically a force X in the moving direction acting in the moving direction of the plug and a force Y in the pushing direction acting in the direction of pushing the plug at right angles thereto.
It is made by two directions of forces X and Y. In order to position the erroneous erasure prevention plug 6 at both ends in the moving direction, this kind of erroneous erasure prevention plug 6 is provided with an engaging portion 6b which is integrally linked with the operation portion 6a.

The setting position of the engaging portion 6b of the erroneous erasure prevention plug 6 preferably satisfies the following two conditions. (1) An unnecessary rotation moment should not be applied to the erroneous erasure prevention plug 6 by the operating force of the plug (force X in the moving direction and force Y in the pushing direction). (2) When the engaging portion 6b is disengaged from the positioning portion, the operating force of the plug must not conversely cut into the positioning portion. Is.

In order to satisfy these two conditions, FIG.
In the conventional tape cassette shown in FIG. 11, engaging portions 6b are provided on the opposite side of the operation window 5 of the operation portion 6a having the operation claw 9 of the erroneous erasure prevention plug 6 at predetermined intervals, and these operation portions 6 are provided.
The positioning rib 10 provided on the cassette housing 1 is sandwiched between a and the engaging portion 6b. Then, positioning vertical grooves 11a and 11b are provided at two positions on the opposite side of the positioning window 10 from the operation window 5, and these vertical grooves 11a and 11b are provided.
The erroneous erasure prevention plug 6 is positioned at both ends of the operation window 5 by b and the engaging portion 6b which can be engaged with this. In the figure, 10a is a guide protrusion provided on the base of the positioning rib 10 on the side of the operation window 5, and the guide protrusion 10a prevents the erroneous erasure prevention plug 6 from falling.

According to the tape cassette having such a structure, when the operating claw 9 exposed in the operating window 5 is applied with a claw or the like to apply an operating force (X, Y), it is indicated by a chain double-dashed line in FIG. As shown, the force Y in the pushing direction elastically deforms the engaging portion 6b rearward. At the same time, the engaging portion 6b is pulled out from the vertical groove 11a (or 11b) by the force X in the moving direction, the locking force is reduced, and the erroneous erasure prevention plug 6 moves smoothly in the left-right direction. During this movement, the resistance force when the engaging portion 6b is disengaged from the vertical groove 11a (11b) and pops out gives a click feeling when the plug is operated.

[0008]

However, in such a conventional tape cassette, the positioning ribs 11 provided on the upper half 2 are provided with the positioning vertical grooves 11 at two positions.
a and 11b are provided, and the positioning rib 10 is sandwiched between the operating portion 6a and the engaging portion 6b that can engage with the vertical grooves 11a and 11b, and the resistance when the engaging portion 6b goes in and out of the vertical groove 11a (11b). It was structured to give a click feeling when operating the plug by force. Therefore, when the operating forces X and Y are applied to the erroneous erasure prevention plug 6, the engaging portion 6b is tilted in the direction away from the vertical groove 11a (or 11b), and the engaging portion 6b.
Has a problem in that it easily disengages from the vertical groove 11a (or 11b), the locking force of the erroneous erasure prevention plug 6 is weakened, and the click feeling during operation is weakened.

Therefore, in the conventional erroneous erasure prevention plug 6, the dimension L between the operating portion 6a and the engaging portion 6b is set to be small, and the positioning rib 10 is formed between the operating portion 6a and the engaging portion 6b.
The clearance between the erroneous erasure prevention plug 6 and the positioning rib 10 is eliminated as much as possible so that a light press-fitting state is obtained when the pin is sandwiched.

However, if the engaging portion 6b is deformed by fatigue due to long-term use or creep deformation is caused by storage at a high temperature, the operating portion 6a and the engaging portion 6 will be described.
There is a problem that a clearance is generated between the b and the positioning rib 10, the locking force of the erroneous erasure prevention plug 6 is reduced or becomes unstable, and the click feeling is weakened by the reduction of the locking force. In addition, since there is no clearance between the erroneous erasure prevention plug 6 and the positioning rib 10 during assembly, it is difficult to insert the positioning rib 10 between the operating portion 6a and the engaging portion 6b, and workability during assembly is improved. There was also the problem of being bad.

The present invention has been made in view of the above conventional problems, and provides a clear click feeling when a plug is operated, is easy to assemble, and has a stable locking force. Is intended to provide.

[0012]

In order to solve the above-mentioned problems and the like and to achieve the above-mentioned objects, the present invention, for example, as shown in FIGS.
Operation window 5 in the plug housing 17 of the cassette housing 1
In a tape cassette in which an erroneous erasure prevention plug 16 that can be opened and closed is movably accommodated and the erroneous erasure prevention detection hole 8 is opened and closed by moving the erroneous erasure prevention plug 16 from the operation window 5, a cassette housing 1 Is provided in the plug housing 17 of the plug and the engaged portion 29 is provided at a position corresponding to the opening / closing position of the plug.
A positioning rib 18 having a and 29b, a positioning engagement portion 16b provided on the accidental erasure prevention plug 16 and engageable with the engaged portions 29a and 29b, and an accidental erasure prevention plug 1
6 is provided, and an elastic member that contacts the engaging portion 16b of 6 and presses the engaging portion 16b against the positioning rib 18 against the movement operation force of the erroneous erasure prevention plug 16 is provided.

Further, in the tape cassette of the present invention, for example, as shown in FIGS. 1, 2 and 8, the elastic member is a supporting rib 19 (33) provided on the cassette housing 1 and the supporting rib 19. The click member 22 (34) is press-fitted into the (33) and supported in a cantilevered manner.
It is preferable that the press-fitting portion 22a (34a) is elastically deformed by the rotation of the click member 22 (34) about the point a).

Further, it is preferable that the click member 22 (34) of the tape cassette of the present invention has a color that can be identified from the operation window 5, and that the color can be changed according to a predetermined identification item.

[0015]

The present invention has the above-mentioned configuration,
When the accidental erasure prevention plug 16 is moved from the operation window 5,
A spring force is generated in the elastic member contacting the surface opposite to the operation window 5, and the engaging portion 16b is pressed against the positioning rib 18 by the spring force of the elastic member. As a result, a clear click feeling can be obtained when the erasure prevention plug 16 is moved.

Further, when the accidental erasure prevention plug 16 is operated, the operating force is applied to the click member 22 through the accidental erasure prevention plug 16.
When added to (34), the press-fitting portion 22a (34) of the click member 22 (34) press-fitted into the support rib 19 (33).
a) is elastically deformed, so that the press-fitting portion 22a (34)
A spring force is generated in a) and a restoring force is generated in the click member 22 (34). As a result, the click member 22 (34)
Restoring force acts on the erroneous erasure prevention plug 16, and a click feeling is given during operation.

Further, by selecting the color of the click member 22 (34) according to the predetermined identification item, the predetermined item can be identified by the color of the click member 22 (34) viewed from the operation window 5. You can

[0018]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 7 show one embodiment of the present invention and show an example in which the present invention is applied to a DAT tape cassette. 8 shows another embodiment of the elastic member according to the present invention. In addition, in FIGS.
The same parts as those of the conventional tape cassette shown in FIGS.

In FIG. 5, which shows the overall construction of an embodiment of the present invention, 1 is a synthetic resin having an appropriate rigidity (for example,
PP (Polypropylene), ABS (Acrylonitrile
It is a cassette housing made of butadiene / styrene resin), HIPS (high impact polystyrene), or the like}. The cassette housing 1 is composed of a pair of upper half 2 and lower half 3 which are vertically stacked. Then, the upper and lower halves 2 and 3 that have been overlapped are tightened and fixed from the lower half 3 side by a plurality of fixing screws (not shown) so that they can be disassembled and assembled.

The cassette housing 1 has a supply-side reel 12 on which a magnetic tape as an information recording tape is wound.
And the take-up reel 13 are rotatably housed. The magnetic tape pulled out from the supply-side reel 12 is guided by a tape guide provided in one opening, crosses the mouse portion 14 on the front surface of the cassette housing 1, and is guided by a tape guide provided in the other opening. The reel 13 is wound up and wound up on the winding side reel 13. Then, the mouse portion 1 of the cassette housing 1
A lid 15 is openably and closably supported in the opening 4 and both openings, and the lid 15 in the closed state protects the magnetic tape crossing the front surface of the cassette housing 1 so as to wrap it. The lid 15 is composed of three lids, that is, a front lid 15a, a top lid 15b, and a back lid 15c.

On one side of the back label attaching surface 4 which is the back surface of the cassette housing 1, a rectangular operation window 5 is provided by notching the edge of the upper half 2. A plug accommodating portion 17 is provided inside the cassette housing 1 inside the operation window 5, and the erroneous erasure prevention plug 1 is provided in the plug accommodating portion 17.
6 is housed so as to be movable in the surface direction of the back label sticking surface 4.

As shown in FIGS. 1 to 4, the plug accommodating portion 17 comprises a space portion in which the shape of the upper half 2 side and the shape of the lower half 3 side are substantially vertically symmetrical, and the upper half 2 side is It is surrounded by a top plate 2a, a side plate 2b, a back plate 2c, and a peripheral piece 2d that extends in an arc shape so as to surround the outside of the reel, and the lower half 3 side is a bottom plate 3a, a side plate 3b, a back plate 3c, and a reel. It is formed so as to be surrounded by a peripheral piece 3d extending in an arc shape so as to surround the outer side of. The upper half 2 is provided with a low-positioning rib 18 and a supporting rib 19 extending in parallel to each other, and the lower half 3 is provided with a high-height partition 20.

The positioning ribs 18 and the supporting ribs 19 are parallel to the rear plate 2c, and the partition 20 is arranged below the supporting ribs 19 on the side far from the rear plate 2c so as to face each other in the vertical direction. Has been done. The partition 20 is a back plate 3c
And the upper end thereof extends to the mating surface of the upper half 2. Then, the click member 22 is lightly press-fitted and attached to the support rib 19 from below.

As shown in FIG. 6 and the like, the click member 22 is made of a rectangular block-like member, and a slit 23 extending in the longitudinal direction and penetrating from one side surface to the other side surface is provided at the center of the upper surface. , Thereby forming the forked portion 22a. The bifurcated portion 22a is provided with flexibility by giving a proper elasticity, and the press-fitted portion 21 is formed by lightly press-fitting the bifurcated portion 22a into the support rib 19, and the press-fitting portion 21 forms the click member. 22 is suspended and supported by the upper half 2. Therefore, when the free end side of the cantilever-supported click member 22 is pressed, the click member 22 is elastically deformed corresponding to the pressing force, and the resistance force based on the elastic deformation of the click member 22 is generated. Acts as a spring force on the click member 22. Due to the function of the press-fitting portion 21, the restoring force for returning to the initial supporting state (see FIG. 1) acts on the click member 22. The support rib 19 and the click member 22 constitute an elastic member that causes the click member 22 of the press-fitting portion 21 to elastically deform.

The lower edge of the click member 22 is the lower half 3.
When the operation window 5 is opened, the identification surface, which is the plane of the click member 22 on the operation window 5 side, can be identified from the operation window 5 when the operation window 5 is opened. As the material of the click member 22, various synthetic resins that can be formed in a flat plate shape (for example, PP (polypropylene), POM (polyacetal), PE (polyethylene), PC (polycarbonate), etc.) can be used. The color of the click member 22 (which may be only the identification surface) is set to be different from the colors of the upper and lower halves 2 and 3, so that the color of the identification surface has a meaning.

As a method of coloring the click member 22, for example, a desired color can be freely set by appropriately selecting the color of the plastic material.
However, a desired color may be applied to the surface of the identification plate by printing, a desired coloring tape may be attached, and various other methods may be used.

As the color of the click member 22, red is generally used as a color of the identification surface in the present embodiment, because red has been conventionally used to prevent erroneous erasure of the information recording tape. However, the color of the click member 22 is not limited to red, and any color can be used according to the item to be identified. The predetermined identification items that can be identified by the color of the identification surface include, for example, the type of cassette (general cassette and software dedicated cassette, etc.), target user (commercial cassette and commercial cassette, etc.), and cassette application ( General recording and music-only recording), various kinds of items such as the presence or absence of built-in IC memory for storing various kinds of information such as cassette type, usage, and grade.

In FIG. 6 showing the click member 22, reference numeral 24 is a notch provided in the click member 22 in order to avoid contact with the peripheral partition 2d, and 25 is the partition 2
It is a notch provided for the purpose of alignment with 0.
Corresponding to the partition piece 25 of the click member 22, a step portion 20a continuous in the longitudinal direction is provided on the operation window 5 side of the upper end portion of the partition piece 20.

Further, on the lower surface plate 3a of the lower half 3 which is a surface different from the surface of the cassette housing 1 on which the operation window 5 is provided, in order to detect prevention of accidental erasure of information recorded on the magnetic tape. The erroneous erasure prevention detection hole 8 is provided so as to vertically penetrate therethrough. The erroneous erasure prevention detection hole 8 is formed so as to be slightly biased to the side surface plate 3b side with respect to the operation window 5, and the operation window 5 and the erasure prevention detection hole 8 are simultaneously opened by the movement of the erroneous erasure prevention plug 16. Alternatively, it is configured to be closed.

The erroneous erasure prevention plug 16 which opens and closes the operation window 5 and the erroneous erasure prevention detection hole 8 is constructed as shown in FIG. That is, the accidental erasure prevention plug 16 faces the inside of the operation window 5 and can open and close the operation window 5.
6a, an engaging portion 16b arranged behind the operating portion 16a with a predetermined space, and the operating portion 16a and the engaging portion 1
It has a main body portion 16c which is continuously integrated with the lower portion of 6b. An opening / closing lid 26 for opening / closing the erroneous erasure prevention detection hole 8 is provided on one side surface of the main body 16c, whereby the operation window 5 and the erroneous erasure prevention detection hole 8 which are provided in a biased manner are simultaneously opened. Or it can be closed.

The operation portion 16a of the erroneous erasure prevention plug 16
Is formed in a rectangular block shape slightly larger than the operation window 5, and an operation claw 27 for slidingly operating the erroneous erasure prevention plug 16 is provided on one side of the front surface so as to project laterally. ing. This operation claw 27 is the operation window 5
It is loosely fitted inside, and an operator's claw or the like is hooked at the time of slide operation to apply an operation force. The tips of a plurality of guide protrusions 28 provided on the front side of the positioning rib 18 come into contact with the back surface of the operation portion 16a, and the guide portions 28 support the operation portion 16a from the inside.

The engaging portion 16 of the accidental erasure prevention plug 16
b is provided so as to come into contact with the surface of the positioning rib 18 on the side opposite to the operation window 5, and the vertical grooves 29a, which are two engaged portions for positioning provided on the positioning rib 18, 29b can be engaged and disengaged. The two vertical grooves 29a, 29b are set at the open end and the closed end of the operation window 5, and a click feeling is caused by a change in resistance force when the engaging portion 16b goes in and out of these vertical grooves 29a, 29b. Is given.

Further, a pressing protrusion 30 protruding rearward is provided at a middle portion in the height direction on the back side of the engaging portion 16b, and the pressing protrusion 30 of the click member 22 press-fitted and supported by the supporting rib 19. It is in contact with the surface on the operation window 5 side. The pressing protrusion 30 serves as an input point of the spring force of the click member 22, and the restoring force of the click member acts on the erroneous erasure prevention plug 16 via the pressing protrusion 30. Therefore,
The pressing protrusion may be provided on the click member 22, but since the erroneous erasure prevention plug 16 moves, the click member 22 may be moved.
It is necessary that the pressing projection provided on the ridge is a ridge that is continuous in the lateral direction.

The operation portion 16a and the engaging portion 16b are integrated by a main body portion 16c which is continuous downward,
At the lower end of the main body portion 16c, the opening / closing lid 26 is formed in a semicircular shape so as to expand in the plane direction. This allows
When the operation window 5 is completely closed, the erroneous erasure prevention detection hole 8 is completely closed by the opening / closing lid 26, and when the operation window 5 is completely opened, the erroneous erasure prevention detection hole 8 is also completely opened.
The lower end of the main body portion 16c is supported by a step portion 31 provided in front of the partition 20 of the lower half 3 and is movable along the step portion 31.

As a material of the erroneous erasure prevention plug 16 having such a structure, for example, a synthetic resin such as POM (polyacetal) or PP (polypropylene) is suitable. However, other than this, various materials such as metal and ceramics can be used.

The operation window 5 opened on the side surface of the cassette housing 11 is a window for moving the erroneous erasure prevention plug 16, but like the erroneous erasure prevention detection hole 8 opened on the lower surface, it is located on the side. It can also be used as a detection hole for an erroneous erasure prevention detection mechanism that detects erroneous erasure prevention from the above. in this case,
A detection pin 32 of an erroneous erasure prevention detection mechanism provided on a mechanical deck of an audio device or the like is laterally inserted into the operation window 5 as an erroneous erasure prevention detection hole. The detection pin 32 can mechanically identify the recordable / non-recordable state of the tape cassette based on the opened / closed state of the operation window 5. On the other hand, when the detection pin 32 of the erroneous erasure prevention detection mechanism is located below the mechanical deck, the erroneous erasure prevention detection hole 8 provided on the lower surface of the cassette housing 1 is used to transfer information to the information recording tape as usual. Recordable / unrecordable status is detected.

According to this embodiment having such a structure, as shown in FIGS. 1 to 4, the operation window 5 on the back surface of the cassette housing 1 is completely closed by the operation portion 16a of the erroneous erasure prevention plug 16. By forming the cassette housing 1 and the accidental erasure prevention plug 16 in the same color with the same material (for example, POM or the like), the operation window 16 has the same color as the surface of the cassette housing 1. The color of the surface of (for example, gray),
It is possible to know the recordable state of information on the information recording tape by visually observing the color of the operation portion 16a.
At the same time, since the erroneous erasure prevention detection hole 8 on the lower surface of the cassette housing 1 is completely closed by the opening / closing lid 26 of the erroneous erasure prevention plug 16, the erroneous erasure prevention detection mechanism installed below the tape cassette also The recordable state of information can be mechanically detected.

In this case, the positioning rib 18 of the upper half 2 and the guide projection 28 are interposed between the operating portion 16a and the engaging portion 16b of the erroneous erasure prevention plug 16 with a clearance of an appropriate size. . The engaging portion 16b is in a state of being locked by being engaged with one of the vertical grooves 29a of the positioning rib 18, and the pressing protrusion 30 of the engaging portion 16b.
The click member 22 is in contact with the rear side of the.

From this state, an operation force F for moving the operation claw 27 in the operation window 5 by hooking the tip of the fingernail or the like is applied to the erroneous erasure prevention plug 16 and the erroneous erasure prevention plug 16 is pushed in. Force Y in the pushing direction and force X in the moving direction acting in the direction of moving the erroneous erasure prevention plug 16.
And work. Then, by this operating force F, the positioning rib 18 and the guide protrusion 28 serve as the upper end guide, and the step portion 31 serves as the lower end guide to slide the erroneous erasure prevention plug 16 in the lateral direction, and from the state shown in FIG. Then, the operation window 5 is completely opened.

In this case, since the engaging portion 16b of the erroneous erasure prevention plug 16 is provided with appropriate elasticity, the operating force F
The engaging portion 16b elastically deforms based on the above, and comes out from the vertical groove 29a. Due to the elastic deformation of the engaging portion 16b, the pressing protrusion 30 moves rearward to move the click member 22 into the press-fitting portion 2.
1 is rotated in the counterclockwise direction S in FIG. As a result, the forked portion 22a, which is the press-fitting portion 21 of the click member 22, is elastically deformed and slightly opened, and the restoring force that causes the forked portion 22a to return to the original position causes the click member 22 to move in the clockwise direction T in FIG. A spring force is generated. The spring force of the click member 22 is the engaging portion 16b.
Continues until it enters the vertical groove 29b (or 29a) again.

Then, the engaging portion 16b is again inserted into the vertical groove 29b.
(Or 29a), the spring force of the click member 22 acts on the erroneous erasure prevention plug 16, thereby providing a click feeling during the moving operation. Therefore, when the operation window 5 is completely opened or closed by moving the erroneous erasure prevention plug 16, vertical grooves 29a and 29b are provided at these positions, respectively, so that a clear click feeling is felt at the time of opening or closing. You can

At this time, since the click member 22 acts on the erroneous erasure prevention plug 16 like a leaf spring, the erroneous erasure prevention plug 6 is provided on the positioning rib 10 of the upper shell 2 as in the conventional tape cassette shown in FIG. Therefore, it is not necessary to strongly sandwich it, and the dimension intersection of the sandwiching portion can be loosened. Therefore, the positioning rib 18 and the guide protrusion 28 of the upper half 2 can be easily inserted between the operation portion 16a and the engagement portion 16b of the erroneous erasure prevention plug 16, and the workability during assembly can be improved. it can. Further, it is possible to provide a clear click feeling even with a rough dimension intersection without making the dimension intersection of the erroneous erasure prevention plug 16 and the upper half 2 strict. Moreover, the press-fitting strength of the press-fitting portion 21 only needs to be such that no clearance is generated between the press-fitting portion 21 and the support rib 19, and it is not necessary to make it too strong.
The creep deformation of itself can be made small enough to be ignored, and the plug operation force and click force can be stabilized.

When the erroneous erasure prevention plug 16 changes from the state of FIG. 3 to the state of FIG. 4 by such a plug operation, both the operation window 5 and the erroneous erasure prevention detection hole 8 are opened. As a result, the identification surface of the click member 22 appears behind the operation window 5,
By visually observing the color of the identification surface (red in this embodiment), it is possible to know the unrecordable state of the information on the information recording tape. The detection of the unrecordable state is also performed by the detection pin 32 of the erroneous erasure prevention detection mechanism installed on the side. Similarly, since the erroneous erasure prevention detection hole 8 on the lower surface of the cassette housing 1 is opened, the unrecordable state of information is mechanically detected by the detection pin 32 of the erroneous erasure prevention detection mechanism installed below the tape cassette. can do.

Another embodiment of the elastic member shown in FIG. 8 is that the supporting rib 33 has a cross-sectional shape like an undercut of a tooth, and upward facing claw portions 33a, 33a are provided on both sides of the lower end. The upper end of the click member 34 is hooked by 33a to prevent the click member 34 from coming off. Therefore, the slit 35 that forms the forked portion 34 a of the click member 34
At both ends of the opening side of the
6 and 36 are provided respectively. According to this example,
The claw portion 33a of the support rib 33 is the protrusion 3 of the click member 34.
6 is caught by the claw portion 33a and the convex portion 36 so that the claw portion 33a is prevented from coming off, and the press-fitting portion 37 of the click member 34 is prevented.
Can be made difficult to come off from the support rib 33.

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 a DAT tape cassette has been described. It can be applied to various tape cassettes using a magnetic tape as a recording medium such as an 8 mm video cassette. Further, in the above-mentioned embodiment, the example in which the operation window 5 is provided on the back surface having the spine label sticking surface 4 has been described, but it goes without saying that the operation window may be provided on the right side surface or the left side surface orthogonal to this. is there.

In the above embodiment, an example in which the operation portion 16a and the engagement portion 16b are provided on the upper portion of the erroneous erasure prevention plug 16 and the main body portion 16c having the opening / closing lid 26 is provided on the lower portion has been described. On the contrary, the operation erasing portion and the engaging portion may be provided below the erroneous erasure prevention plug 16 and the main body portion may be provided above. Further, in the above embodiment,
Although the example in which the vertical groove is used as the engaged portion has been described, a protrusion extending in the vertical direction can be used, and a semicircular concave portion or convex portion can also be applied. in this case,
The shape of the engaging portion matches the shape of the engaged portion. For example, when the engaged portion is a ridge, a vertical groove is provided in the engaging portion, and when the engaged portion is a semicircular recess. The engaging portion is provided with a semicircular convex portion, and when the engaged portion is a semicircular convex portion, the engaging portion is provided with a semicircular concave portion. As described above, the present invention can be variously modified without departing from the spirit thereof.

[0047]

As described above, according to the present invention,
Since the positioning rib having the engaged portion, the engaging portion of the erroneous erasure prevention plug, and the elastic member that presses the engaging portion against the positioning rib are provided, when the erroneous erasure prevention plug is moved from the operation window, A spring force is generated in the elastic member that contacts the surface on the side opposite to the operation window, and this spring force presses the engaging portion against the positioning ribs, which provides a clear click feeling when the erroneous erasure prevention plug is moved. be able to.
Moreover, a click feeling can be obtained even if the dimensional crossing of the accidental erasure prevention plug and the shell housing is loosened, and it is not necessary to press the accidental erasure prevention plug strongly into the positioning rib unlike the conventional case. The erasure prevention plug can be easily assembled, and the workability during assembly can be improved.

Further, since the click member is press-fitted into the support rib to form the elastic member and the click member in the press-fitting portion is elastically deformed, the structure is simple and the spring force can be reliably generated. it can. Moreover, the press-fitting strength of the press-fitting part may be such that no clearance is generated between the press-fitting part and the supporting rib, and it is not necessary to make it too strong. It is possible to stabilize the movement operation force and the locking force of the erasure prevention plug and obtain a clear click feeling.

Further, since the color of the click member can be changed, by selecting the color of the click member according to the predetermined identification item, the predetermined item can be identified by the color of the click member seen from the operation window. In addition, it is possible to provide a tape cassette capable of identifying predetermined items by the number of selected colors.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a main part of a tape cassette according to an embodiment of the present invention, and is an explanatory view showing a state before a plug operating force is input.

FIG. 2 is an explanatory diagram showing a state after the plug operating force is input.

FIG. 3 is a cross-sectional view taken along the line AA of FIG. 1 and is an explanatory view showing a state when the operation window is closed.

FIG. 4 is an explanatory view showing a state when the operation window is opened.

FIG. 5 is an external perspective view of the tape cassette according to the embodiment of the present invention as viewed from the bottom side.

6 is a perspective view of the click member shown in FIGS. 1 to 4. FIG.

FIG. 7 is a perspective view of the erroneous erasure prevention plug shown in FIGS.

FIG. 8 is a sectional view showing another embodiment of the elastic member according to the present invention.

FIG. 9 is a principal part explanatory view showing a cross section of a part of the back side of a conventional tape cassette.

FIG. 10 is an explanatory diagram showing a vertical cross section of the main part of the same.

FIG. 11 is an explanatory view showing a cross section taken along the line BB of FIG. 11.

[Explanation of symbols]

 1 cassette housing 2 upper half 3 lower half 5 operation window 8 erroneous erasure prevention detection hole 16 erroneous erasure prevention plug 16a operation part 16b engagement part 16c main body part 17 plug accommodating part 18 positioning rib 19, 33 support rib 20 partition 21 Press-fitting part 22,34 Click member 22a, 34a Bifurcated part 23,35 Slit 26 Opening / closing lid 27 Operating claw 28 Guide protrusion 29a, 29b Vertical groove (engaged part) 30 Pressing protrusion 32 Detection pin

Claims (3)

[Claims] 1. An erroneous erasure prevention plug capable of opening and closing an operation window is movably accommodated in a plug accommodating portion of a cassette housing composed of a pair of upper and lower halves, and the erroneous erasure prevention plug is moved from the operation window. In a tape cassette in which an erroneous erasure prevention detection hole is opened and closed, a positioning rib which is provided in the plug housing portion of the cassette housing and has an engaged portion at a position corresponding to the opening / closing position of the plug, The erasure prevention plug comes into contact with the positioning engagement portion that is engageable with the engaged portion and the engagement portion of the erroneous erasure prevention plug and resists the operation force of the erroneous erasure prevention plug. And a resilient member that presses the engaging portion against the positioning rib. 2. The tape cassette according to claim 1, wherein the elastic member includes a support rib provided on the cassette housing and a click member press-fitted into the support rib and supported in a cantilever manner. A tape cassette characterized in that the click member of the press-fitting portion is elastically deformed by the rotation of the click member with the press-fitting portion as a fulcrum. 3. The tape cassette according to claim 1, wherein the click member has a color that can be identified from the operation window, and the color can be changed according to a predetermined identification item. cassette.