JPH0737358A - Tape cassette - Google Patents

Abstract

PURPOSE:To form a through-view window of a tape cassette for a cassette half by sing a separate window member. CONSTITUTION:Window holes 21 and 31 consisting of through-view parts 21a and 31a and recessed parts 21b and 31b on the inner peripheral surface side are formed at cassette halves 2 and 3. Through-view windows plate members 22 and 32 consisting of engagement parts 22a and 32a and joint parts 22b and 32b are adhered to the window holes 21 and 31 by engaging the engagement parts 22a and 32a to the through-view parts 21a and 31a and, at the same time, the engagement parts 22b and 32b to the recessed surface parts 21b and 31b. Also. engagement parts 21c1, 21c2 and 31c1, 31c2 are formed at he window holes 21 and 31 and the recessed surface parts 21b and 31b and parts 22c1, 22c2 and 32c1, 32c2 to be engaged are formed at the joint parts 22b and 32b of the through-view window plate members 22 and 32, thus engaging the engagement part to the part to be engaged and hence joining and fixing the through-view window plate members 22 and 32 to the window holes 21 and 31 using both engagement and joint.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape cassette such as an audio tape cassette and a video tape cassette.

[0002]

2. Description of the Related Art Conventionally, in audio tape cassettes, video tape cassettes, etc., a cassette half body is made opaque in black or the like, and a see-through window is formed in the central portion of the cassette half body for seeing through the winding state of the storage tape. ing.

As described above, in order to form the transparent window in the opaque cassette half body, the opaque half body and the transparent window are integrally formed by two-color molding, or the opaque half body and the transparent window member are formed. And are molded separately,
The transparent window member is ultrasonically welded to the opaque half body to form the transparent window in the main body.

Further, in the case of a resin material for which such a two-color molding method or ultrasonic welding method cannot be used, the opaque half body and the transparent window member are joined by caulking to form the transparent window in the half body. .

[0005]

As described above, in the tape cassette, there are various methods for forming the see-through window in the opaque cassette half body, but in the two-color molding method, the mold and the molding process are complicated. Further, in the ultrasonic welding method, it is necessary to install an apparatus for performing the welding, which increases the equipment cost, and both methods have a problem that the cost is high.

In the case where the transparent window member is joined by caulking, the thin portion must be formed wide in the half body in order to fit the transparent window member, and the thin portion should be formed wide in this half body. Has a problem in that the resin flow during molding of the half body is hindered, and defective products are likely to occur.

On the other hand, conventionally, there is a method of joining and fixing the window member to the half body with an adhesive or an adhesive, but since the adhesive or the like deteriorates with time, the reliability as a product deteriorates. There is a defect.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a tape cassette in which a transparent window member separate from the half body can be securely bonded and fixed to the half body.

[0009]

In order to achieve the above object, the present invention provides a tape cassette in which a window member is joined to a half body to form a see-through window. A see-through window is formed by forming a joining surface that faces each other and forming an engaging portion that engages with each other, adhering the joining surfaces with an adhesive, and engaging the engaging portions with each other to join the window member to the half body. Is formed.

In this structure, it is preferable that a recess is formed in the inner peripheral surface of the window formed in the half body to serve as a joint surface of the window member and an engaging portion is formed in the peripheral edge of the recess. .

[0011]

As described above, since the half body and the window member are adhered to each other by the adhesive at their joint surfaces and are engaged with each other at the engaging portions, they are securely fixed to each other. Even when the window member is molded with a resin material that cannot be two-color molded with the half body, the window member can be securely bonded and fixed to the half body and is not peeled off due to aging, thus improving the reliability of the product.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

In the figure, reference numeral 1 denotes the entire tape cassette, and a pair of upper and lower halves 2 and 3 are butted against each other and joined by screws 4 to form a flat cubic cassette casing 1a. Inside the body 1a, a magnetic tape storage portion 1b and a tape running portion 1c are divided by a guide block 5.

The magnetic tape accommodating portion 1b has a pair of hub drive shaft insertion holes 2a, 2b and 3a, 3b in the halves 2 and 3, respectively.
Is formed on the inner surface side peripheral edge of the insertion hole.
a ₁ , 2b ₁ and 3a ₁ , 3b ₁ are formed. Between the insertion holes 2a and 2b of the halves 2 and 3 and the insertion hole 3a
And 3b, transparent windows 2c and 3c are formed.

Both sides on the front side of the magnetic tape storage portion 1b,
That is, a pair of guide rollers 8 and 9 and guide pins 10 and 11 are axially supported and erected on the lower half 3 side at portions corresponding to both sides of the tape running portion 1c.

Further, in the tape running portion 1c, a head insertion opening 12 is provided in the central portion across the upper and lower halves 2 and 3 on the front side.
Pinch roller insertion openings 13 and 14 are formed on both sides thereof, and caps corresponding to the pinch roller insertion openings 13 and 14 are formed on the upper and lower surfaces, that is, on the front stepped flat portions on the upper and lower halves 2 and 3. Stan insertion holes 15a and 15b, 16a
And 16b are drilled.

At the inner side of the tape running portion 1c, that is, at the center of the guide block 5 which is separated from the magnetic tape housing portion 1b, the shield plate holding portion 5 is provided corresponding to the head insertion opening 12.
A shield plate 17 having a substantially U-shape is fitted and held by forming a, and between both side pieces 17a and 17b of the shield plate 17,
A leaf spring 19 having a tape pressure pad 18 fixed to the center is hung and supported.

The above-mentioned magnetic tape T is a pair of hubs 6 and 7.
The magnetic tape storage unit 1b is wound around the magnetic tape storage unit 1b and is sandwiched by the slippery sheets 20a and 20b from above and below.
Both ends of 7 are rotatable to annular protrusions 2a ₁ , 2b ₁ and 3a ₁ , 3b ₁ on the periphery of hub drive shaft insertion holes 2a, 2b and 3a, 3b formed on the inner surfaces of upper and lower halves 2 and 3. Engaged.

The magnetic tape T is provided between the hubs 6 and 7 on the tape running portion 1c on the front side of the guide block 5 and the pair of guide rollers 8 and 9 and the guide pins 10 and 11 on both sides.
And is slidably contacted with the front surface side of the guide block 5 and is also brought into contact with the tape pressure pad 18 at the central portion thereof. And the pinch rollers and capstan insertion holes 16b, 15b or 15a, 16a inserted from the pinch roller insertion ports 14 or 13
Recording and reproduction are performed by causing the tape running portion 1c to run by the rotation of the hubs 6 and 7 and the rotation of the capstan that is pinched by the capstan that is inserted into the.

In the tape cassette 1 thus constructed, the transparent windows 2c and 3c formed in the magnetic tape housing portion 1b of the cassette housing 1a, that is, in the upper and lower halves 2 and 3, respectively.
In this example, as shown in FIGS. 2 and 3, horizontally elongated window holes 21 and 31 are located in the flat portions of the halves 2 and 3 between the hub drive shaft insertion holes 2a and 2b and between 3a and 3b. Drilled,
The transparent window plate members 22 and 32 are joined and fixed to the window holes 21 and 31, respectively.

Window holes 21 and 3 of the see-through windows 2c and 3c
1 is between the hub drive shaft insertion holes 2a and 2b and between 3a and 3b
Inside of the through-hole portions 21a and 31a penetrating inside and outside between
It is formed by providing concave portions 21b and 31b on the surface side peripheral surface portion.
The peripheral edges facing the front and rear of the concave surface portions 21b and 31b
Engaging portion 21c₁And 21c₂And 31c₁And 31c
₂Are formed, that is, the concave surface portions 21b and 31 are formed.
b is a horizontally long rectangular shape, and is attached to the peripheral edge of the long side facing the front and back.
Joint 21c₁And 21c₂And 31c₁And 31c₂Is reverse
It is formed into a superficial shape.

On the other hand, the transparent window plate members 22 and 32 have window holes.
Fitting to be fitted into the through-hole portions 21a and 31a of 21 and 31
Concave surface portions 21b and 31 continuous with the joining portions 22a and 32a
to form joints 22b and 32b that are fitted and contacted with b.
The concave portions on the front and rear end faces of the joint portions 22b and 32b.
21b and 31b engaging portion 21c₁And 21c₂And 31
c₁And 31c₂Engaged portion 22c engaged with₁And 22c
₂And 32c₁And 32c ₂Is formed, and this
Joint 22c₁And 22c₂And 32c₁And 32c₂Is
It is formed into a flat surface.

The transparent window plate members 22 and 32 are
For joining and fixing to windows 21 and 31 of halves 2 and 3
First, the concave surface portions 21b and 31b of the window holes 21 and 31 are
Or the fitting portions 22a and 32 of the transparent window plate members 22 and 32
Any of the joint surfaces of the joint portions 22b and 32b surrounding a.
An adhesive layer a is formed on one side, and in this state, the transparent window plate portion is formed.
Fit materials 22 and 32 inside half 2 and 3
The joint portions 22a and 32a are replaced by the through hole portions 21 of the window holes 21 and 31.
Joining parts 22b and 32b while fitting to a and 31a
Bonding the bonding surface of the to the concave portions 21 and 31 via the adhesive layer a
And the engaged portion 22c on the peripheral surface₁, 22c₂And 32
c₁, 32c₂The engaging portion 21c₁, 21c ₂And 31c
₁, 31c₂Engage with.

By engaging the engaged portions of the transparent window plate members 22 and 32 with the engaging portions of the window holes 21 and 31, the tapered portions of the engaged portion and the engaging portion are reversed. Due to the planar relationship, the transparent window plate members 22 and 32 are pressed from the front and rear end face sides while being adhered to the concave surface portions 21b and 31b of the window holes 21 and 31, respectively. When the transparent window plate members 22 and 32 are joined to each other at the joint portion, they are double-joined, so that the transparent window plate members 22 and 32 are securely joined to the window holes 21 and 31, that is, the halves 2 and 3.

Therefore, this example is an effective means for forming the halves 2 and 3 with the transparent windows 2c and 3c by the resin material which cannot be two-color molded.

FIGS. 4 and 5 show perspective windows 2 of halves 2 and 3.
c and 3c, the window holes 21 and 31 and the transparent window plate member 2
Another example of joining and fixing with 2 and 32 will be described. FIG. 4 shows through holes 21a and 31a of window holes 21 and 31.
With respect to the concave surface portions 21b and 31b of the horizontally long rectangular shape of the inner surface side peripheral portion, opposite taper side engaging portions 21d ₁ and 21d ₂ and 31d ₁ and 31d ₂ are formed on the short side peripheral edge portions facing on both sides, Corresponding to this, the joining portions 22b and 32 surrounding the fitting portions 22a and 32a of the transparent window plate members 22 and 32, respectively.
tapered end portions 22d ₁ and 22d on both end faces of b
₂ and 32d ₁ and 32d ₂ are formed.

Therefore, in this example, the window holes 21 and 3
As described above, the transparent window plate members 22 and 32 are joined and fixed to the 1 by fitting the joint portions 22b and 32b to the concave surface portions 21b and 31b with the fitting portions 22a and 32a fitted to the through holes 21a and 31a. Bonding and engaging part 21d
₁ , 21d ₂ and 31d ₁ , 31d ₂ and the engaged portion 22d
Engage ₁ , 22d ₂ and 32d ₁ , 32d ₂ . In this state, pressure is applied in a state of being pressed in from both end face sides, and in this case also double bonding occurs, and the transparent window plate member 2
The joining and fixing of the halves 2 and 32 to the halves 2 and 3 are reliably performed.

The window shown in FIG. 5 has windows 21 and 3.
In the peripheral portions facing the front and back of the concave surface portions 21b and 31b surrounding the through-hole portions 21a and 31a on the inner surface side, and the peripheral portions facing the left and right sides, and an engaging portion having an inverted L-shape at substantially the center thereof. 21e ₁ , 21e ₂ , 21e ₃ , 21e
₄ and 31e ₁ , 31e ₂ , 31e ₃ and 31e ₄ are formed so as to project.

On the other hand, the concave surface portion 2 is formed at the center of each of the front and rear and left and right peripheral side surface portions of the joint portions 22b and 32b corresponding to the concave surface portions 21b and 31b of the transparent window plate members 22 and 32.
1b and inverted L-shaped engaging portion 21e of 31b ₁ ~21e ₄ and 31e ₁ ~31e ₄ correspond to the recessed step surface shaped engaged portion 2
2e ₁ , 22e ₂ , 22e ₃ , 22e ₄ and 32e ₁ ,
32e ₂ , 32e ₃ and 32e ₄ are formed.

Then, in order to bond and fix the transparent window plate members 22 and 32 to the window holes 21 and 31, the bonding surfaces of the bonding portions 22b and 32b or the window hole 2 as in the above-described embodiments.
When an adhesive or the like is applied to the inner surfaces of the concave surface portions 21b and 31b of 1 and 31 to form the adhesive layer a, the fitting portions 22a and 32a are fitted to the through holes 21a and 31a, and the joining portion 22b and 32b is fitted and adhered to the concave portions 21b and 31b, and the engaging portions 21e _{1 to} 21e ₄ and 31e ₁ to
31e ₄ and engaged parts 22e _{1 to} 22e ₄ and 32e ₁ to
32e ₄ is engaged. By this engagement, the transparent window plate member 2
2 and 32 are for windows 21 and 31, i.e. half 2
And 3 and are pressed from four directions and securely bonded and fixed.

In joining and fixing the transparent window plate members 22 and 32, engaging portions 21e _{1 to} 21e ₄ and 31e are formed.
_{1 to} 31e ₄ and engaged parts 22e _{1 to} 22e ₄ and 32e
The engagement with _{1 to} 32e ₄ is performed by the inverted L-shaped engagement portion 21e ₁ to
Its engagement portion because 21e ₄ and 31e ₁ ~31e ₄ is engaged with the immersive shape concave stepped surface shaped engaged portion 22e ₁ ~22e ₄ and 32e ₁ ~32e ₄ becomes the same plane, the half Unnecessary protrusions do not occur on the inner surface sides of 2 and 3, and the transparent window plate members 22 and 32 are in the same plane and form a part of the inner surfaces of the halves 2 and 3.

In each of the above embodiments, the adhesive for adhering the transparent window plate member to the half is not limited to a sticky adhesive, but various adhesives such as cyanoacrylate-based or UV-curable adhesives may be used. It can be used.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the present invention.

For example, the shape and size of the through-hole portion and the concave surface portion of the window hole can be arbitrarily changed according to need, and
The engagement portion between the concave portion of the window hole and the transparent window plate member can also have various configurations, as long as it does not easily come off after the engagement.

The present invention is not limited to compact tape cassettes, but can be widely applied to various audio tape cassettes, video tape cassettes and the like.

[0036]

As described above, according to the present invention, in a tape cassette in which a window member is joined to a half body to form a see-through window, the joining and fixing of the half body and the window member is performed by bonding with an adhesive. Since it is configured to perform the engagement with each other at the joint, the window member can be fixedly joined to the half body even when the half body and the window member are molded with a resin material that cannot be two-color molded. It is also possible to reduce the thin portion formed on the half body and fitted and bonded with the window member by fixing the window member together with the engagement by the engaging portion, and the resin for molding the half body can be reduced. The half body can be reliably molded without affecting the material flow,
The yield is improved, and the joining and fixing of the window members have the effects of improving reliability as compared with the case of bonding alone.

[Brief description of drawings]

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

FIG. 2 is an enlarged cross-sectional view of a main part.

FIG. 3 is an exploded perspective view of the same part.

FIG. 4 is an exploded perspective view of a main part of another example.

FIG. 5 is an exploded perspective view of a main part of still another example.

[Explanation of symbols]

1 tape cassette 1a cassette Kushigetai 2,3 half 2c, 3c transparent window 21 and 31 window holes 21a, 31a through hole portions 21b, 31b concave portion _{21c 1, 21c 2, 31c 1} , 31c 2 engaging portions 22, 32 transparent window plate members 22a, 32a engaging portion 22b, 32 b joint _{22c 1, 22c 2, 32c 1} , 32c 2 engaged portion _{21d 1, 21d 2, 31d 1} , 31d 2, 21e 1 ~
21e _4, 31e ₁ ~31e ₄ engaging portion _{22d 1, 22d 2, 32d 1} , 32d 2, 22d 1 ~
22d ₄ , 32d _{1 to} 32d ₄ engaged portion

Claims (2)

[Claims] 1. A tape cassette having a window member joined to a half body to form a see-through window, wherein a joining surface is formed between the half body and the window member so as to be in contact with each other, and the half body and the window member are engaged with each other. An engagement portion is formed, the joining surfaces are adhered with an adhesive agent, and the engagement portions are engaged with each other to join the window member to the half body to form a see-through window. And tape cassette. 2. A concave portion is formed in a peripheral surface portion of an inner surface side of a window hole formed in the half body as a joint surface of the window member, and an engaging portion is formed in a peripheral portion of the concave portion. The tape cassette according to claim 1.