JPH0745041A - Tape cassette - Google Patents

Abstract

PURPOSE:To obtain a cassette alowed to be inserted to a VTR used both for standard recording and high density recording but interrupted from being inserted to a VTR used for standard recording with a different recording format. CONSTITUTION:To prevent the erroneous insertion to a magnetic recording and/or reproducing device, an erroneous insertion preventing groove part 2a62 coped with the time of insertion from the wider width direction and erroneous insertion preventing groove parts 2a82, 2a84 coped with the time of insertion from the narrower width direction are respectively provided at prescribed positions on the bottom surface 2a of a 2nd cassette casing 2B constituting the tape cassette 1B for high density recording. These erroneous insertion preventing groove parts 2a62, 2a82, 2a84 are formed on the bottom surface 2a of the 2nd cassette casing 2B constituting the tape cassette 1A for standard recording and made to prescribed dimensions which are short by the extent capable of visibly confirming from an erroneous insertion preventing groove part 2a61 coped with the time of insertion from the wider width direction and an erroneous insertion preventing groove parts 2a81 coped with the time of insertion from the narrower width direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape cassette, and more particularly to prevention of erroneous insertion of a tape cassette into a magnetic recording and / or reproducing device.

[0002]

2. Description of the Related Art An example of a conventional tape cassette used in a magnetic recording and / or reproducing apparatus (hereinafter referred to as VTR) such as a video tape recorder is shown in FIG.

FIG. 9 is a perspective view for explaining a conventional tape cassette, FIG. 9A is a view of the tape cassette seen from the upper side, and FIG. 9B is a view of the tape cassette seen from the lower side. Further, FIG. 10 is a view for explaining an erroneous insertion preventing operation when the conventional tape cassette is inserted into the VTR of the example from the wide direction, and (A) is a perspective view showing the insertion from the normal direction. The figure, (B) is a side sectional view showing a state of being properly inserted, and (C) is a side sectional view showing a state of being erroneously inserted. Further, FIG. 11 is a view for explaining an erroneous insertion preventing operation when a conventional tape cassette is inserted into a VTR of another example from a narrow width direction, and (A) shows insertion from a normal direction. FIG. 3 is a perspective view, FIG. 3B is a side sectional view showing a state in which it is normally inserted, and FIG. 3C is a side sectional view showing a state in which it is incorrectly inserted.

The conventional tape cassette 1A shown in FIGS. 9A and 9B is formed, for example, to have a tape width of 1/2 inch, and a thick base film is coated with magnetic powder such as iron oxide. The magnetic tape (hereinafter referred to as iron oxide tape) To is housed in the cassette housing 2A, and is configured as a standard recording tape cassette capable of recording and / or reproducing in a standard recording format, for example, VHS standard format. ing.

The cassette housing 2A, which constitutes a part of the exterior of the tape cassette 1A, has an upper half member and a lower half member, which are molded from a resin material, which are vertically fitted together and joined by screws or the like. It is assembled into a substantially rectangular shape. Further, the iron oxide tape To is wound between the supply-side tape reel 3 and the winding-side tape reel 4 which are rotatably housed in the cassette housing 2A, and is wound around the supply-side tape reel 3. The iron oxide tape To passes through the supply-side guide pole 5 and the front side of the bottom surface 2a of the cassette housing 2A is lightened to open the loading pocket 2a _1.
While being stretched along 2a- ₃ , it is further wound around the winding-side tape reel 4 via the winding-side guide poles 6 and 7.

Further, reel holes 2a ₄ and 2a ₅ facing the supply-side and take-up side tape reels 3 and ₄ are formed at an intermediate portion of the bottom surface 2a of the cassette housing 2A. In addition, in the loading pockets 2a _{1 to} 2a _{3 of} the cassette housing 2A,
The iron oxide tape To is pulled out of the cassette housing 2A when a loading member (not shown) on the VTR side is inserted.

Further, in the front part of the cassette housing 2A,
A front lid 8 for protecting the stretched iron oxide tape To is biased by a torsion spring 9 in the closing direction and is pivotally supported so as to be openable and closable. This front lid 8 also constitutes a part of the exterior of the tape cassette 1A, and is made of a resin material to make the cassette housing 2
It is formed in a long shape corresponding to the wide direction (longitudinal direction) of A.

Here, the VT of the conventional tape cassette 1A
The operation of preventing erroneous insertion into R will be described with reference to FIGS. 9 to 11.

First, as shown in FIGS. 9 (B) and 10 (A), an example of a standard recording format is adopted from the X ₁ direction with the wide front lid 8 constituting the tape cassette 1A at the head. The first erroneous insertion preventing means on the side of the tape cassette 1A used when the tape is normally inserted into the VTR 50 for standard recording (for VHS) is a concave cutout portion 8a which is formed by cutting a lower front center of the front lid 8 into a shallow concave shape. a central space passage of the loading pockets 2a ₂ of the cassette housing 2A, while matching the loading pocket front wall portion 2a ₂₁ of the central loading pocket 2a in ₂ a concave notch portion 8a facing to and recessed notch 8a The center of the front portion of the bottom surface 2a is formed in a shallow concave shape so as to form a substantially straight line with an erroneous insertion preventing groove portion 2a ₆₁ . At this time, the erroneous insertion preventing groove portion 2a is provided from the front surface 2b of the cassette housing 2A on the back surface side of the front lid 8.
The length up to the end of ₆₁ is set to a long dimension of α ₁ mm. A lamp insertion hole 2a ₇ into which a lamp for detecting the start end and the end of the iron oxide tape To is inserted is deeply formed in the middle of the erroneous insertion prevention groove 2a ₆₁ , and the lamp insertion hole 2a ₇ is also erroneously formed. Insertion prevention groove 2a
It is a part of ₆₁ .

On the other hand, as shown in FIG. 10A, in the VTR 50 for standard recording (for VHS), which is an example of allowing the insertion of the above-mentioned tape cassette 1A from the wide width direction,
An upper cassette insertion / removal position where the cassette holder 51 inserts and removes the tape cassette 1A, and the inserted tape cassette 1A.
Is movably provided between the cassette housing 2A and the cassette mounting position, and the front lid 8 is opened during the downward movement of the tape cassette 1A. The iron oxide tape To can be pulled out toward the rotary drum by a loading member (not shown). Further, in the cassette holder 51, a cassette insertion / removal opening 51a is formed wide by using a sheet metal member together with the cassette housing 2A, and the erroneous insertion prevention groove portions (8a, 2a) are formed in a shallow concave shape as described above. ₆₁₎ and longitudinal center to erroneous insertion preventing detection member of the bottom plate 51b in correspondence (hereinafter, referred to as erroneous insertion preventing detection member) 51b ₁ are formed by cutting and raising a low level upwards. Further, the cassette holder 51 is formed raised outright away stopper piece _51b 2, 51b ₂ are intervals in the left-right in the insertion direction leading end of the tape cassette 1A, the stopper piece 51b ₂
The length from to the end of the misinsertion prevention detection piece 51b ₁ is set to be a size β ₁ mm slightly shorter than the size α ₁ mm of the misinsertion preventing groove portion 2a ₆₁ described above. Therefore, when the cassette holder 51 is viewed from the front, the erroneous insertion prevention detection piece 51
installation position of b ₁ is erroneous later insertion preventing detection member 61b ₁
It is installed in front of (Fig. 2).

Then, as shown in FIGS. 10 (A) and 10 (B), the front lid 8 having a wide width is placed at the top, and the cassette housing 2
The tape cassette 1A is inserted from the cassette insertion / removal opening 51a in such a posture that the bottom surface 2a of A can be placed on the bottom plate 51b of the cassette holder 51. At this time, the side surfaces 2c and 2d of the cassette housing 2A are accompanied by the insertion operation of the cassette housing 2A.
Prevention There order guided inserted while being restricted to the insertion direction right cassette insertion slot 51a and the side surface 51c of the cassette holder 51, the 51d, the first erroneous insertion preventing erroneous insertion detecting piece 51b ₁ tape cassette 1A of the cassette holder 51 It is inserted into the erroneous insertion preventing groove portion 2a ₆₁ of the bottom surface 2a of the cassette housing 2A through the concave cutout portion 8a of the front lid 8 and the space passage in the central loading pocket 2a ₂ which constitutes the means. Dimension α ₁ mm> Dimension β ₁
Since it is set to mm, the misinsertion prevention detection piece 51b ₁
There at a predetermined position just before contact with the end of the insertion preventing groove 2a ₆₁ mis, and, since the front surface 2b of the cassette housing 2A is inserted to a predetermined position in contact with the stopper piece 51b _2,
It can be determined that the tape cassette 1A is properly inserted.

Further, as shown in FIG. 10 (C), unlike the normal insertion direction from the wide width direction described above, the wide front lid 8 of the tape cassette 1A is placed at the beginning, and
In the case where the tape cassette 1A is inserted in the normal insertion direction and when it is inserted upside down by mistake, or when it is inserted incorrectly with the wide back surface 2e of the cassette housing 2A facing the front lid 8 as the head. The tip end abuts against the erroneous insertion prevention detection piece 51b ₁ of the cassette holder 51, and the tape cassette 1
Since A cannot be inserted to a predetermined position in the cassette holder 51 and protrudes largely backward, it can be determined that it has been erroneously inserted.

Next, as shown in FIGS. 9B and 11A, another standard recording format is adopted from the Y ₁ direction starting from the narrow side surface 2 c of the cassette housing 2 A. The second erroneous insertion preventing means on the side of the tape cassette 1A used when the tape is normally inserted into the VTR 55 for standard recording (for VHS) is the side surface 2c to the bottom surface 2a of the cassette housing 2A.
It is constituted by a long erroneous insertion preventing groove 2a ₈₁ which penetrates up to the side surface 2d along the side and is formed in a concave shape which is biased toward the rear surface 2e and is formed in a straight line in a direction substantially wide. The length of the groove portion 2a ₈₁ is set to the same dimension γ ₁ mm as the wide width of the cassette housing 2A.

On the other hand, as shown in FIG. 11 (A), in the VTR 55 for standard recording (for VHS) of another example which allows the tape cassette 1A to be inserted from the narrow width direction,
An upper cassette insertion / removal position where the cassette holder 56 inserts and removes the tape cassette 1A, and the inserted tape cassette 1A.
Is movably provided between a cassette mounting position that moves downward. Further, the cassette holder 56 has a cassette insertion / removal opening 56a formed by using a sheet metal member so as to have a narrow width together with the cassette housing 2A, and has a shallow concave shape as described above, which corresponds to the erroneous insertion prevention groove portion 2a _81. Erroneous insertion prevention detection member (hereinafter referred to as erroneous insertion prevention detection piece) forward from the center of the bottom plate 56b in the longitudinal direction with respect to the insertion direction.
56b ₁ is formed by cutting and raising upward at a low height. A stopper surface 56c is formed on the cassette holder 56 at the front end in the insertion direction of the tape cassette 1A, and an erroneous insertion prevention detection piece 56b is formed from the stopper surface 56c.
The length up to the end of ₁ is the above-mentioned erroneous insertion preventing groove portion 2a.
_The dimension δ ₁ mm is shorter than the dimension γ ₁ mm of ₈₁ . Therefore, when the cassette holder 56 is viewed from the front,
The erroneous insertion prevention detection piece 56b ₁ is installed in front of an erroneous insertion prevention detection piece 66b ₁ (FIG. 5) described later.

Then, as shown in FIGS. 11A and 11B, the narrow side surface 2c of the cassette housing 2A is placed at the beginning,
Moreover, the bottom surface 2a of the cassette housing 2A is the cassette holder 5
The tape cassette 1A is inserted from the cassette insertion / removal opening 56a in such a posture that it can be placed on the bottom plate 56b of No. 6. At this time, as the cassette housing 2A is inserted, the front lid 8 and the back surface 2e of the cassette housing 2A are guided to the cassette insertion / removal opening 56a of the cassette holder 56, and the front lid 8 side is the loading pocket 56d and the back surface 2e. since There are guided along the back 56e, erroneous insertion preventing detection member 56b ₁ is erroneous insertion preventing groove portions 2a of the bottom surface 2a of the cassette housing 2A constituting the second erroneous insertion preventing means of the tape cassette 1A of the cassette holder 56 _81, and thereafter, as described above, the dimension γ ₁ mm> dimension δ ₁ mm is set, so that the side surface 2c of the cassette housing 2A is inserted to a predetermined position where it abuts the stopper surface 56c, and the tape cassette is inserted. It can be determined that 1A was inserted normally.

Further, as shown in FIG. 11C, unlike the normal insertion direction from the narrow width direction, the narrow side surface 2c of the cassette housing 2A is located at the head and the normal insertion direction is achieved. The side surface 2d facing the narrow side surface 2c of the cassette housing 2A when it is erroneously inserted by reversing the time.
Tape cassette 1
Insertion direction leading end of A will be in contact with the erroneous insertion preventing detection member 56b ₁ of the cassette holder 56, the tape cassette 1A is erroneously inserted than protruding greatly rearward unable inserted into a predetermined position in the cassette holder 56 You can judge that

[0017]

By the way, as described above, the iron oxide tape To is stored in the cassette housing 2A,
Conventional standard recording (VH that can be recorded and / or reproduced in the VHS standard format, which is the standard recording format)
In the tape cassette 1A (for S), an example of a VTR for standard recording (for VHS) that allows insertion from a wide width direction
50, it is possible to detect the above-mentioned erroneous insertion other than the insertion from the normal direction into the VTR 55 for standard recording (for VHS) of another example which allows the insertion from the narrow width direction.

On the other hand, recently, there has been a demand for a VTR for high-density recording capable of recording and / or reproducing a high-definition HDTV image or a landscape screen TV image at a high density. Therefore, on January 8, 1993, a W-VHS standard format, which is a high-density recording / reproducing format different from the conventional standard recording format, was proposed. In the tape cassette for high-density recording (for W-VHS) that can support this W-VHS standard format, the outer shape of the cassette housing can be used for common production equipment, low cost, and upward compatibility with VTR. Is set to have substantially the same external dimensions as the cassette housing 2A that constitutes the conventional standard recording (VHS) tape cassette 1A, and the tape width is formed in the cassette housing to, for example, 1/2 inch, and the thickness is set. A magnetic tape (hereinafter referred to as a metal tape) in which a magnetic material such as chrome is applied or vapor-deposited on the thin base film is stored. Then, using a metal tape, it can be densely arranged in the W-VHS standard format.
Track recording and / or reproduction can be performed.

However, there are standard recording (V
A large number of VTRs 50 and 55 (for HS) have already been used, and the external dimensions of the cassette housing are set to be approximately the same as those of the conventional cassette housing 2A (for high density recording (W-
Tape cassette for VHS) for standard recording (for VHS)
Even if it is inserted into the VTRs 50 and 55, recording and / or reproduction cannot be performed because the recording formats are different, which causes a great inconvenience to the user.

Therefore, the conventional standard recording (for VHS) VT of high density recording (for W-VHS) tape cassette is used.
Equipped with erroneous insertion prevention means that can prevent insertion into R50, 55, and newly developed tape cassette for high-density recording (for W-VHS) standard recording with upward compatibility maintained,
There is a demand for a high-density recording (for W-VHS) tape cassette provided with an erroneous insertion preventing means capable of detecting erroneous insertion even when the tape is inserted into a VTR for both high-density recording (VHS and W-VHS combined). It should be noted that the upward compatibility cannot support the VTRs 50 and 55 for standard recording (for VHS) that have already been used, and newly developed standard recording and high-density recording (VH
This system is compatible with VTRs for both S and W-VHS.

[0021]

The present invention has been made in view of the above problems, and a first invention is to wind a first magnetic tape, which is recorded and reproduced in a first recording format, between a pair of reels. A front lid that can be opened and closed so as to be housed in a substantially rectangular first cassette housing while being rotated and to cover the first magnetic tape stretched by a loading pocket formed in a front portion of the first cassette housing. Wrong insertion prevention supported by the first cassette housing and capable of being inserted by an erroneous insertion prevention detection member on the apparatus side to prevent erroneous insertion of the first cassette housing into the magnetic recording and / or reproducing apparatus A second magnetic tape, which has substantially the same structure as the tape cassette for the first recording format in which a groove for use is formed on the bottom surface of the first cassette housing, and which is recorded and reproduced in the second recording format is the first cassette housing. It is housed in a second cassette casing having substantially the same outer dimensions as that of the first cassette casing, and an erroneous insertion preventing groove is formed on the bottom surface of the second cassette casing corresponding to the erroneous insertion preventing groove of the first cassette casing. In the tape cassette for the second recording format, the length of the erroneous insertion prevention groove of the second cassette housing is shorter than the length of the erroneous insertion prevention groove of the first cassette housing by visual confirmation. In addition, the second cassette housing is formed to have a predetermined length, and
When inserted into the first device adopting the recording format, an erroneous insertion prevention detection member provided in front of the first device comes into contact with the end of the erroneous insertion prevention groove of the second cassette housing, While it can be determined that the second cassette housing is erroneous by blocking the insertion of the second cassette housing, when the second cassette housing is inserted into the second device adopting the second recording format, the erroneous insertion prevention detection member of the first device is more likely to be installed. Normal insertion can be determined by allowing the insertion to the predetermined position without the erroneous insertion prevention detection member of the second device provided at the back contacting the end of the erroneous insertion prevention groove of the second cassette housing. It is a tape cassette characterized in that it is configured as described above.

A second aspect of the present invention is the tape cassette of the first aspect of the present invention, wherein the first and second device sides of the first and second devices, which permit the insertion of the second cassette housing from a wider direction,
An erroneous insertion preventing groove formed on the bottom surface of the second cassette housing corresponding to the second erroneous insertion prevention detecting member is located inside the loading pocket on the back surface of the concave notch formed in the lower end of the front lid. The second cassette casing is formed by forming a concave groove in a substantially straight line of a predetermined length from the front wall surface of the loading pocket facing the concave notch through the space passage to the bottom so as to match the concave notch. The first erroneous insertion prevention among the first and second erroneous insertion prevention detection members that have passed through the concave cutout portion and the space passage in the loading pocket and entered the concave groove in accordance with the insertion operation of the body. The tape cassette is characterized in that only the detecting member is received at the end of the concave groove.

A third aspect of the present invention is the tape cassette of the first aspect of the present invention, wherein the first and second device sides of the first and second devices which allow the second cassette housing to be inserted from a wider direction.
An erroneous insertion preventing groove formed on the bottom surface of the second cassette housing corresponding to the second erroneous insertion prevention detecting member is located inside the loading pocket on the back surface of the concave notch formed in the lower end of the front lid. Through the space passage to the front wall surface portion of the loading pocket facing the concave cutout portion to form the space passage having a predetermined length. Of the first and second wrong insertion prevention detecting members that have passed through the concave notch and entered the space passage in the loading pocket, only the first wrong insertion preventing detection member is on the front wall surface of the loading pocket. It is a tape cassette characterized in that it is configured to be received.

A fourth aspect of the present invention is the tape cassette of the first aspect of the present invention, wherein the first and second device sides of the first and second devices, which allow the second cassette housing to be inserted from a direction in which the width is narrow.
The erroneous insertion prevention groove formed on the bottom surface of the second cassette housing corresponding to the second erroneous insertion prevention detection member has a predetermined length from the side surface to the bottom surface of the second cassette housing. By forming the concave groove in a substantially straight line, the second
Among the first and second erroneous insertion prevention detecting members that have entered the concave groove in association with the insertion operation of the cassette housing, only the first erroneous insertion prevention detecting member is received at the end of the concave groove. It is a tape cassette characterized by being configured.

Further, in a fifth aspect of the invention, the magnetic tape is wound between a pair of reels and housed in a substantially rectangular parallelepiped cassette housing, and the tape is stretched by a loading pocket formed in a front portion of the cassette housing. In a tape cassette in which a front lid that can be opened and closed so as to cover the magnetic tape is supported by the cassette housing, at least one upper edge on the upper surface side of the cassette housing or the upper edge on the front surface side of the front lid is an R surface. When the R surface is inserted so as to face the erroneous insertion prevention detecting member on the apparatus side, the erroneous insertion prevention detecting member contacts the R surface to prevent erroneous insertion of the cassette housing. It is a tape cassette characterized in that a notched portion having a surface is formed.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the tape cassette according to the present invention will be described in detail below with reference to FIGS.

1A and 1B are views for explaining a tape cassette according to the present invention. FIG. 1A is a perspective view of the tape cassette viewed from the upper side, and FIG. 1B is a cassette housing and a front cover R.
FIG. 2 (C) is a perspective view of the tape cassette viewed from the lower side, and FIG. 2 is a VTR for both standard recording and high density recording of the tape cassette according to the present invention from the wide direction. FIG. 3 is a side sectional view for explaining an erroneous insertion preventing operation when the tape cassette according to the present invention is inserted into the VTR from a wide width direction, and FIG. A state in which it is normally inserted in a VTR for both standard recording and high density recording is shown, (B) shows a state in which it is incorrectly inserted in a conventional VTR for standard recording, and (C) is a VTR for both standard recording and high density recording. FIG. 4 is a side sectional view showing a state in which the conventional tape cassette is properly inserted into a VTR for both standard recording and high density recording from a wide width direction, and FIG. 5 is a sectional view showing the present invention. The tape cassette related to FIG. 6 is a perspective view showing a state of being inserted in a VTR for both recording and high density recording. FIG. 6 is a side cross-sectional view for explaining an erroneous insertion preventing operation when the tape cassette according to the present invention is inserted into the VTR from a narrow width direction. Is a figure,
(A) shows a state in which it is normally inserted in a VTR for both standard recording and high-density recording, and (B) shows a conventional VTR for standard recording.
Fig. 7C shows a state in which the tape is mistakenly inserted into the VTR, and Fig. 7C shows a state in which the tape is mistakenly inserted into a VTR for both standard recording and high density recording. FIG. 8 is a side sectional view showing a state in which the tape cassette is normally inserted in a dual-purpose VTR, FIG. 8 is a diagram for explaining a modified example of the tape cassette according to the present invention, and FIG. B) is a side sectional view.

The tape cassette 1B according to the present invention
Is the standard recording format (first
An iron oxide tape (first magnetic tape) To which recording / reproduction is performed in a recording format) is stored in a cassette housing (hereinafter referred to as a first cassette housing) 2A for standard recording (first recording tape).
For tape cassette 1A (for recording format),
A second magnetic tape (hereinafter referred to as a metal tape) T having a magnetic recording characteristic different from that of the iron oxide tape To is formed in the second cassette housing 2B formed to have substantially the same outer dimensions as the first cassette housing 2A.
m, and the first and second cassette housings 2B corresponding to the first and second erroneous insertion preventing means of the first cassette housing 2A.
Although the length of the second erroneous insertion preventing means is different, the other configurations are substantially the same, and therefore, for convenience of description, the same reference numerals are given to the same constituent members described above, In addition, a description will be given by adding a new reference numeral to a component different from the conventional one.

The tape cassette 1B according to the present invention shown in FIGS. 1A to 1C has a tape width of 1/2 inch, for example, and a thin base film made of a magnetic material such as chromium. The coated or vapor-deposited metal tape (second magnetic tape) Tm is housed in the second cassette housing 2B and recorded in a second recording format (hereinafter, referred to as high density recording format), for example, in the W-VHS standard format. And / or a tape cassette for the second recording format (for high-density recording) that can be reproduced.

The tape cassette 1B has a newly developed standard recording / high density recording (VH
Insertion is allowed in a VTR for both S and W-VHS), while conventional standard recording (VH
The VTRs 50 and 55 (for S) are prevented from being inserted by the first and second erroneous insertion preventing groove portions described later.

That is, in the second cassette housing 2B which constitutes a part of the exterior of the tape cassette 1B, the upper half member and the lower half member, which are molded by using the resin material, are fitted with the upper and lower lids, and the screw is used. It is assembled into a substantially rectangular parallelepiped shape by being combined with each other, etc., and is set to have substantially the same outer dimensions as the first cassette housing 2A constituting the conventional tape cassette 1A described above. In addition, the second cassette housing 2B
A metal tape Tm is wound between the supply-side tape reel 3 and the take-up-side tape reel 4 which are rotatably housed inside, and the metal tape Tm wound on the supply-side tape reel 3 is supplied to the supply-side guide. Via the pole 5, via the winding-side guide poles 6 and 7, while being stretched along the loading pockets 2a _{1 to} 2a ₃ which are opened by lightening the front portion of the bottom surface 2a of the second cassette housing 2B. And the metal tape Tm wound up on the winding side tape reel 4 and further stretched.
Is protected by a front lid 8 which is urged in a closing lid direction by a torsion spring 9 and pivotally supported so as to be freely opened and closed.

Here, the tape cassette 1 according to the present invention
The operation of preventing the erroneous insertion of B into the VTR will be described with reference to FIGS.

For high density recording according to the present invention (W-VHS
The tape cassette 1B (for use) is equipped with an erroneous insertion preventing means capable of preventing the insertion into the VTRs 50, 55 for standard recording (for VHS) which adopts the conventional standard recording format (first recording format), and newly has a higher rank. Both standard recording and high density recording (V recording) developed with the compatibility maintained and adopting the standard recording format (first recording format) and high density recording format (second recording format)
Erroneous insertion preventing means is provided which can detect an erroneous insertion even when it is inserted into the VTRs 60 and 65 (for both HS and W-VHS).

First, as shown in FIGS. 1C and 2, an example of standard recording and high-density recording (VHS) combined from the X ₁ direction with the wide front lid 8 forming the tape cassette 1B at the head is shown. , W-VHS combined) VTR 60 is normally inserted into the tape cassette 1B side of the first erroneous insertion preventing means is a concave notch 8a which is a shallow notch in the lower front center of the front lid 8, 2 and space passage of the central loading pocket 2a ₂ of the cassette housing 2B, is matched from the loading pocket front wall portion 2a ₂₁ of the central loading pocket 2a in ₂ a concave notch portion 8a facing to and recessed notch 8a However, the center of the front portion of the bottom surface 2a is formed in a shallow concave shape so as to form a substantially straight line with the incorrect insertion preventing groove portion 2a ₆₂ . At this time, the second cassette housing 2B
The installation position in the width direction of the incorrect insertion prevention groove 2a ₆₂ is set to the same position as the installation position in the width direction of the conventional incorrect insertion prevention groove 2a ₆₁ shown in FIG. 9B, and ,
The length from the front surface 2b of the second cassette housing 2B to the end of the erroneous insertion prevention groove portion 2a ₆₂ on the back surface side of the front lid 8 is as shown in FIG.
It is set to a dimension α ₂ mm that is visually shorter than the length dimension α ₁ mm to the end of the conventional misinsertion preventing groove portion 2a ₆₁ shown in (B). It should be noted that the lamp insertion hole 2 into which a lamp for detecting the start end and the end of the metal tape Tm is inserted deep inside the end of the erroneous insertion prevention groove 2a _62.
a ₇ is deeply formed.

On the other hand, as shown in FIG. 2, in the VTR 60 for both standard recording and high-density recording (for both VHS and W-VHS) which allows the tape cassette 1B to be inserted from a wide direction, the cassette is The holder 61 is movably provided between an upper cassette insertion / removal position where the tape cassette 1A is inserted / removed and a cassette mounting position where the inserted tape cassette 1A is moved downward. Further, the cassette holder 61 uses a sheet metal member to insert and remove the cassette 61.
a is formed wide together with the second cassette housing 2B,
In addition, as described above, the incorrect insertion prevention detecting member (hereinafter referred to as an incorrect insertion prevention detecting piece) is provided at the central portion in the longitudinal direction of the bottom plate 61b in correspondence with the incorrect insertion preventing groove portion (8a, 2a ₆₂ ). ) 61b ₁ is formed by cutting and raising upward at a low height. Further, the cassette holder 61 has a stopper piece 61 at the front end in the insertion direction of the tape cassette 1B.
b ₂ and 61 b ₂ are formed by cutting and raising at right and left intervals. At this time, the installation position in the width direction of the erroneous insertion prevention detection piece 61b ₁ of the cassette holder 61 corresponds to the installation position in the width direction of the conventional erroneous insertion prevention detection piece 51b ₁ shown in 10 (A). Is set to. Further, the length from the stopper piece 61b ₂ of the cassette holder 61 to the end of the erroneous insertion prevention detection piece 61b ₁ is from the conventional stopper piece 51b ₂ shown in FIG. 10A to the erroneous insertion prevention detection piece 51b _1.
Is set to a dimension β ₂ mm that is shorter than the length dimension β ₁ mm to the end of the length so that it can be visually confirmed, and this dimension β ₂ mm
Is set to a dimension β ₂ mm which is slightly shorter than the dimension α ₂ mm of the erroneous insertion preventing groove portion 2a ₆₂ . Therefore,
When the cassette holder 61 is viewed from the front, the installation position of the incorrect insertion prevention detection piece 61b ₁ is the same as that of the conventional incorrect insertion prevention detection piece 51b.
The tape cassette 1A is installed deeper than the installation position of b ₁ so that it can be visually confirmed.

Then, as shown in FIGS. 2 and 3A, the wide front lid 8 of the tape cassette 1B is placed at the top,
Moreover, the bottom surface 2a of the second cassette housing 2B is a VTR 60 for both standard recording and high-density recording (for both VHS and W-VHS).
The tape cassette 1B is inserted from the cassette insertion / removal opening 61a in such a posture that the tape cassette 1B can be placed on the bottom plate 61b of the cassette holder 61. At this time, along with the insertion operation of the second cassette housing 2B, the side surface 2c of the second cassette housing 2B,
Because 2d is guided inserted while being restricted to the insertion direction right cassette insertion slot 61a and the side surface 61c of the cassette holder 61 by 61d, erroneous insertion preventing detection member 61b ₁ of the cassette holder 61 is first erroneous insertion of the tape cassette 1B concave notch portion 8a of the lid 8 before configuring prevention means, the second through the central space passage of the loading pockets 2a ₂ of
Groove 2a for preventing erroneous insertion on the bottom surface 2a of the cassette housing 2B
₆₂ , after which the dimension α ₂ mm as described above
Since the dimension β ₂ mm is set, the erroneous insertion prevention detection piece 61b ₁ is at a predetermined position just before contacting the end of the erroneous insertion prevention groove 2a ₆₂ , and the front surface 2b of the second cassette housing 2B is since is inserted into the stopper piece 61b ₂ to a predetermined abutting position it can be determined that the tape cassette 1B is inserted correctly.

On the other hand, as shown in FIG. 3B, the wide front lid 8 of the tape cassette 1B is placed at the top, and the bottom surface 2a of the second cassette housing 2B is for standard recording (VHS) described above. Cassette holder 5 that constitutes the VTR 50 (for
Upon insertion of the tape cassette 1B in a posture that can be placed on one of the bottom plate 51b, a concave lid 8 before erroneous insertion preventing detection member 51b ₁ of the cassette holder 51 constitute a first erroneous insertion preventing means of the tape cassette 1B An erroneous insertion preventing groove portion 2a _{62 on} the bottom surface 2a of the second cassette housing 2B is passed through the notch portion 8a and the space passage in the central loading pocket 2a ₂ .
The length dimension β ₁ mm from the stopper piece 51b ₂ to the end of the mistaken insertion prevention detection piece 51b ₁ is longer than the length dimension α ₂ mm of the erroneous insertion prevention groove portion 2a _62. Therefore, the erroneous insertion prevention detection piece 51b ₁ comes into contact with the end of the erroneous insertion prevention groove portion 2a ₆₂ , and the tape cassette 1B cannot be inserted to a predetermined position and is erroneously inserted by preventing further insertion. I can judge.

Returning to FIG. 1, the second cassette housing 2B
On the upper surface 2f side, the upper end ridges along the side surfaces 2c, 2d and the back surface 2e are formed on the R surface in a pleasant feeling, and the upper end ridges on the front surface side of the front lid 8 are also formed in the R surface in a comfortable manner. On this occasion,
Among the upper end ridges, at least the central portion R surface of the upper end ridges along the back surface 2e and the central portion R surface of the upper end ridges on the front surface side of the front lid 8 are
As shown in the enlarged view of FIG.
1 (or 51) erroneous insertion prevention detection piece 61b ₁ (or 51)
Notches 2e ₁ and 8b each having a vertical surface that abuts b ₁ ) and prevents erroneous insertion of the second cassette housing 2B are formed. Then, as shown in FIG. 3C, unlike the normal insertion direction from the wide width direction described above, the wide front lid 8 of the tape cassette 1B is placed at the beginning, and the normal insertion direction is different from the normal insertion direction. The wide back surface 2 of the first cassette housing 2A facing the front lid 8 when inverted upside down and erroneously inserted
In the case where the e is inserted at the beginning and the top and bottom are turned upside down, the cutout portion 8b of the front lid 8 corresponds to these insertion directions.
Erroneous insertion prevention detection piece 61b of the cassette holder 61 (or 51) on the vertical surface of the rear surface or the vertical surface of the cutout portion 2e ₁ of the rear surface 2e.
₁ (or 51b ₁ ) comes into contact with the tape cassette 1B, and the tape cassette 1B cannot be inserted to a predetermined position in the cassette holder 61 (or 51) and protrudes largely backward, so that it can be determined that the tape cassette 1B has been incorrectly inserted.

As shown in FIG. 4, a cassette holder 61 constituting a newly developed VTR 60 for both standard recording and high-density recording (for both VHS and W-VHS) is used for conventional standard recording (for VHS). tape when the front lid 8 is inserted from the normal direction to the top cassette 1A, with respect to the length dimension alpha ₁ mm of the erroneous insertion preventing groove portions 2a _61, insertion preventing detecting piece 61b erroneously from the stopper piece 61b ₂ of _Since the length dimension β ₂ mm to the end of ₁ is shorter, the erroneous insertion prevention detection piece 61
Since b ₁ does not contact the end of the erroneous insertion prevention groove 2a ₆₁ and the front surface 2b of the second cassette housing 2B is inserted to a predetermined position where it contacts the stopper piece 61b ₂ ,
It can be determined that the tape cassette 1A has been inserted normally while maintaining upward compatibility.

Next, as shown in FIG. 1 (C) and FIG.
First, the narrow side surface 2c of the second cassette housing 2B
Did Y₁From other directions, both standard recording and high-density recording (V
Insert into VTR65 (used for both HS and W-VHS) normally
Second erroneous insertion prevention on the tape cassette 1B side used at the time
The means includes a side surface 2c and a side surface 2d of the second cassette housing 2B.
Of the width along the bottom surface 2a between
Incorrectly formed into a shallow concave shape by dividing it into three parts in a straight line in a wide direction.
Insertion prevention groove 2a₈₂, Central clearance groove 2a₈₃， Wrong insertion
Entry prevention groove 2a₈₄Symmetric groove for preventing incorrect insertion
Part 2a₈₂, 2a ₈₄It is composed of. At this time, the second
Groove 2a for preventing erroneous insertion of cassette housing 2B₈₂, 2a
₈₄The installation position in the width direction of the
Groove to prevent incorrect insertion₈₁Corresponding to the installation position in the width direction of
Left and right mis-insertion prevention groove 2a set at one position₈₂，
2a₈₄The length of the
Stop groove 2a₈₁Length dimension γ₁Check visually from mm
Short enough γ_TwoIt is set to mm.

On the other hand, as shown in FIG. 5, in the VTR 65 for standard recording and high-density recording (for both VHS and W-VHS) of another example, which allows the tape cassette 1B to be inserted from the narrow width direction, The cassette holder 66 is movably provided between an upper cassette insertion / removal position for inserting / removing the tape cassette 1A and a cassette mounting position for moving the inserted tape cassette 1A downward. Further, the cassette holder 66 uses a sheet metal member to insert and remove the cassette 66.
a is formed to be narrow together with the second cassette housing 2B,
Further, as described above, the erroneous insertion prevention detecting member (hereinafter referred to as the erroneous insertion prevention detecting member) is biased to the left in the longitudinal width direction of the bottom plate 66b in correspondence with the left erroneous insertion preventing groove portion 2a ₈₂ formed in a concave shape, and biased toward the rear surface 66e. 66b ₁ is formed by cutting and raising upward at a low height. Also,
A stopper surface 66c is formed on the cassette holder 66 at the front end in the insertion direction of the tape cassette 1B. At this time, the installation position in the width direction of the erroneous insertion prevention detection piece 66b ₁ of the cassette holder 66 corresponds to the installation position in the width direction of the conventional erroneous insertion prevention detection piece 56b ₁ shown in FIG. 11 (A). Is set to. Further, the length from the stopper surface 66c of the cassette holder 66 to the end of the erroneous insertion prevention detection piece 66b ₁ is the length from the conventional stopper surface 56c shown in FIG. 11 (A) to the end of the erroneous insertion prevention detection piece 56b _1. Dimension δ ₁ m
The dimension δ ₂ mm shorter than m is set, and this dimension δ
₂ mm is the dimension γ ₂ of the above-mentioned erroneous insertion prevention groove 2a ₈₂
The dimension δ ₂ mm is set to be slightly shorter than mm. Therefore, when the cassette holder 66 is viewed from the front, the installation position of the incorrect insertion prevention detection piece 66b ₁ can be visually confirmed compared to the installation position of the conventional incorrect insertion prevention detection piece 56b ₁ with respect to the insertion direction of the tape cassette 1A. It is installed in the back.

Then, as shown in FIG. 5 and FIG. 6A, the narrow side surface 2c of the second cassette housing 2B is at the head, and the bottom surface 2a of the second cassette housing 2B is the cassette holder 66. The tape cassette 1B is inserted from the cassette insertion / removal opening 66a in such a posture that it can be placed on the bottom plate 66b. At this time, the front lid 8 and the back surface 2e of the second cassette housing 2B are guided to the cassette insertion / ejection opening 66a of the cassette holder 66 with the insertion operation of the second cassette housing 2B, and the front lid 8 side is the loading pocket. 66d, back 2e
Since There are guided along the back 66e, erroneous insertion preventing detection member 66b ₁ tape cassette 1B in the cassette holder 66
Is inserted into the left incorrect insertion prevention groove portion 2a ₈₂ which constitutes the second incorrect insertion prevention means of the
_{Since 2} mm> dimension δ ₂ mm is set, the side surface 2c of the first cassette housing 2A does not contact the erroneous insertion prevention detection piece 66b _{1 at} the end of the erroneous insertion prevention groove portion 2a _{82 and} the stopper surface 66c. It can be determined that the tape cassette 1B has been normally inserted by inserting the tape cassette 1B up to a predetermined position where the tape cassette 1B comes into contact with.

On the other hand, as shown in FIG. 6 (B), the narrow side surface 2c of the second cassette housing 2B is the head, and the bottom surface 2a of the second cassette housing 2B is the standard recording described in the conventional example. use Upon insertion of the tape cassette 1B in a posture that can be placed on the bottom plate 56b of the cassette holder 56 which constitutes the VTR55 (for VHS), the second erroneous insertion preventing detection member 56b ₁ of the cassette holder 56 is a tape cassette 1B Right insertion preventing groove portion 2a which constitutes the wrong insertion preventing means.
₈₂ , where the length dimension δ ₁ mm from the stopper surface 56c to the end of the misinsertion prevention detection piece 56b ₁ is longer than the length dimension γ ₂ mm of the erroneous insertion prevention groove 2a _82. Therefore, the erroneous insertion prevention detection piece 56b ₁ comes into contact with the end of the erroneous insertion prevention groove portion 2a ₈₂ , and further insertion is prevented, so that the tape cassette 1B cannot be inserted to a predetermined position and is erroneously inserted. I can judge.

Further, as shown in FIG. 6C, unlike the normal insertion direction from the narrow width direction, the narrow side surface 2c of the second cassette housing 2B is located at the beginning, and When inserting incorrectly and flipping upside down and inserting incorrectly, or
When the side face 2d facing the narrow side face 2c of the second cassette housing 2B is mistakenly inserted with the side face 2d as the leading end, the leading end of the tape cassette 1B in the insertion direction comes into contact with the wrong insertion prevention detection piece 66b ₁ of the cassette holder 66. Since the tape cassette 1B cannot be inserted to a predetermined position in the cassette holder 66 and protrudes largely backward, it can be determined that the tape cassette 1B is erroneously inserted.

As shown in FIG. 7, a cassette holder 66 that constitutes a newly developed VTR 65 for both standard recording and high-density recording (for both VHS and W-VHS) is used for conventional standard recording (for VHS). When the side face 2c of the first cassette housing 2A constituting the tape cassette 1A is inserted from the normal direction at the beginning, the stopper face 66c is inserted with respect to the length dimension γ ₁ mm of the erroneous insertion prevention groove 2a _81. Since the length dimension δ ₂ mm from the erroneous insertion prevention detection piece 66b _{1 to} the end is shorter, the side surface 2c of the first cassette housing 2A is inserted to a predetermined position where it abuts the stopper surface 66c. It can be determined that 1A has been inserted normally while maintaining upward compatibility.

Next, a modified example of the tape cassette according to the present invention will be briefly described with reference to FIG. FIG. 8 (A),
The tape cassette 1C of the modified example shown in (B) has a second magnetic tape (metal tape) T for recording / reproducing in the above-mentioned second recording format (high density recording format).
m is stored in the second cassette housing 2C. At this time,
The erroneous insertion prevention groove portion of the second cassette housing 2C is different from the erroneous insertion prevention groove portion 2a ₆₂ formed on the bottom surface 2a of the second cassette housing 2B described above, and is otherwise the same.

That is, the loading pocket 2a ₂₂ at the center of the second cassette housing 2C is widened in the depth direction, and from the front side 2b of the second cassette housing 2C to the inner side of the loading pocket 2a ₂₂ on the back side of the front lid 8. The space passage up to the front wall surface portion 2a ₂₃ of the closed loading pocket is set by replacing the misinsertion preventing groove portion, and the length of this space passage is set to the dimension α ₂ mm, and the second cassette described above is set. False insertion preventing groove 2a formed on the bottom surface 2a of the housing 2B
It is set to have the same dimension as the length dimension α ₂ mm of ₆₂ .
Therefore, the first erroneous insertion preventing means of the second cassette housing 2C may be a concave cutout portion 8a formed by cutting out a lower central portion of the front surface of the front lid 8 in a concave shape, and a space passage in the central loading pocket 2a ₂₂ . In other words, although the space passage in the loading pocket 2a ₂₂ is not formed as a concave erroneous insertion preventing groove, it is formed in a straight line, but the space passage does not have the standard recording (V) shown in FIG.
(For HS) mis-insertion prevention detection piece 51b ₁ provided on the cassette holder 51 of the VTR 50, or the standard recording shown in FIG.
VTR6 for high density recording (VHS, W-VHS)
Erroneous insertion prevention detection piece 61 provided on the cassette holder 61 of 0
b ₁ can enter in a substantially straight line. At this time, the second cassette housing 2C is attached to the cassette holders 51, 61.
On the other hand, as described above, since the left and right sides in the insertion direction are restricted, the space passage alone does not cause any trouble.

Therefore, the wide front lid 8 of the tape cassette 1C is placed at the top, and the bottom surface 2 of the second cassette housing 2C is used.
When the tape cassette 1C is inserted in such a posture that a can be placed on the bottom plates 51b and 61b of the cassette holders 51 and 61, the erroneous insertion prevention detection piece 5 provided on the cassette holder 51 is inserted.
Since 1b ₁ is received by the front wall surface portion 2a ₂₃ of the loading pocket, it is possible to prevent an erroneous insertion of the tape cassette 1C into the VTR 50 for standard recording (for VHS), and to prevent an error in the cassette holder 61. Since the insertion prevention detection piece 61b ₁ is inserted at a predetermined position just before coming into contact with the front wall surface portion 2a ₂₃ of the loading pocket and at a predetermined position where the front surface 2b of the second cassette housing 2C comes into contact with the stopper piece 61b ₂ , Tape cassette 1C
Can be judged to have been inserted normally.

[0049]

According to the tape cassette according to the present invention described in detail above, according to the first to fourth aspects,
The first magnetic tape (iron oxide tape) that is recorded and reproduced in the first recording format (standard recording format) is the first
It has the same structure as the tape cassette for the first recording format, which is housed in the cassette housing and has a groove portion for preventing erroneous insertion on the bottom surface of the first cassette housing, and records in the second recording format (high density recording format). The second magnetic tape (metal tape) to be reproduced is stored in the second cassette housing having substantially the same external dimensions as the first cassette housing, and the erroneous insertion preventing groove portion prevents erroneous insertion of the first cassette housing. A tape cassette for the second recording format formed on the bottom surface of the second cassette housing corresponding to the groove for use, wherein the length of the erroneous insertion preventing groove portion of the second cassette housing is By making it shorter than the length of the incorrect insertion prevention groove so that it can be visually confirmed, and by forming it to a predetermined length,
First tape recorder for second recording format (VTR) for standard recording adopting first recording format
When inserted in, the erroneous insertion prevention detection member provided in front of the first device abuts against the end of the erroneous insertion prevention groove of the second cassette housing, and further insertion can be prevented. As a result, there is no concern that the tape cassette for the second recording format will be attached to the first device for standard recording, which has already been adopted in large quantities in the world, and the user of the first device will be inconvenienced. Also disappears. Further, even in the second device (VTR) for high-density recording which adopts the second recording format (high-density recording format) to which the tape cassette for the second recording format is applied, erroneous insertion of the second cassette housing is prevented. be able to.

Further, in the present invention, at least one upper edge on the upper surface side of the cassette housing or the upper edge on the front surface side of the front lid is formed on the R surface in a comfortable manner, and the R surface is erroneously inserted on the apparatus side. When the tape is inserted so as to face the prevention detection member, the notch portion having the vertical surface for preventing the mistaken insertion of the cassette housing by contacting the wrong insertion prevention detection member on the R surface is formed, so that the tape is not hindered. It is possible to prevent erroneous insertion of the cassette into the device.

[Brief description of drawings]

1A and 1B are views for explaining a tape cassette according to the present invention, in which FIG. 1A is a perspective view of the tape cassette as viewed from the upper side, and FIG. 1B is an enlarged view of the cassette housing and the R surface of the front lid. The side sectional view shown by (C) is a perspective view of the tape cassette viewed from the lower surface side.

FIG. 2 is a perspective view showing a state in which the tape cassette according to the present invention is inserted into a VTR for both standard recording and high-density recording from a wide width direction.

FIG. 3 is a side sectional view for explaining an erroneous insertion preventing operation when the tape cassette according to the present invention is inserted into a VTR from a wide width direction, FIG. 3A is a VTR for both standard recording and high density recording. Shows a state where the VTR is normally inserted, and (B) shows a state where the conventional standard recording VTR is erroneously inserted.
FIG. 6 is a diagram showing a state in which the VTR is used for both standard recording and high density recording by mistake.

FIG. 4 is a side sectional view showing a state in which a conventional tape cassette is normally inserted into a VTR for both standard recording and high-density recording from a wide direction.

FIG. 5 is a perspective view showing a state in which the tape cassette according to the present invention is inserted into a VTR for both standard recording and high-density recording from a narrow width direction.

FIG. 6 is a side sectional view for explaining an erroneous insertion preventing operation when the tape cassette according to the present invention is inserted into a VTR from a narrow width direction. FIG. 6A is a VTR for both standard recording and high density recording. Shows a state where the VTR is normally inserted, and (B) shows a state where the conventional standard recording VTR is erroneously inserted.
FIG. 6 is a diagram showing a state in which the VTR is used for both standard recording and high density recording by mistake.

FIG. 7 is a side sectional view showing a state in which a conventional tape cassette is normally inserted into a VTR for both standard recording and high-density recording from the direction of narrow width.

FIG. 8 is a diagram for explaining a modified example of the tape cassette according to the present invention, in which (A) is a perspective view seen from the lower surface side,
(B) is a side sectional view.

FIG. 9 is a perspective view for explaining a conventional tape cassette, FIG. 9A is a view of the tape cassette seen from the upper surface side,
(B) is a view of the tape cassette as seen from the lower surface side.

FIG. 10 is a diagram for explaining an erroneous insertion preventing operation when the conventional tape cassette is inserted into the VTR of the example from the wide direction, and (A) is a perspective view showing the insertion from the normal direction. , (B) is a side sectional view showing a state where the insertion is normally performed, and (C) is a side sectional view showing a state where the insertion is incorrect.

FIG. 11 is a view for explaining an erroneous insertion prevention operation when a conventional tape cassette is inserted into a VTR of another example from a direction with a narrow width, and (A) is a perspective view showing insertion from a normal direction. The figure, (B) is a side sectional view showing a state of being properly inserted, and (C) is a side sectional view showing a state of being erroneously inserted.

[Explanation of symbols]

1A ... Tape cassette (tape cassette) for first recording format, 1B, 1C ... Tape cassette (tape cassette) for second recording format, 2A ... First cassette housing, 2B, 2C ... Second cassette housing, 2a ... bottom,
2a _{1 to} 2a ₃ , 2a ₂₂ ... Loading pocket, 2
a ₂₁ , 2a ₂₃ ... Front wall surface portion of loading pocket, 2
a ₆₁ ... Groove portion for preventing erroneous insertion when inserting the first cassette housing from the wide width direction, 2a ₆₂ ... Groove portion for preventing erroneous insertion when inserting the second cassette housing from the wide width direction, 2a
₈₁ ... Groove portion for preventing erroneous insertion when inserting the first cassette housing from the narrow width direction, 2a ₈₂ ... Groove portion for preventing erroneous insertion when inserting the second cassette housing from the narrow width direction, 2a
₈₄ ... Groove portion for preventing erroneous insertion when the second cassette housing is inserted from the narrow width direction, 2e ... Rear surface, 2e ₁ ... Notch portion, 2
f ... Top surface, 3 ... Supply side tape reel, 4 ... Winding side tape reel, 8 ... Front lid, 8a ... Recessed notch, 8b ... Notch,
50 ... The first device (VTR) when the first cassette housing is inserted from the wide width direction, 55 ... The first device (VTR) when the first cassette housing is inserted from the narrow width direction, 60 ... Second device (VTR) when the first and second cassette housings are inserted from the wide width direction, 65 ... Second device (VTR) when the first and second cassette housings are inserted from the narrow width direction ), 51 ...
Wrong insertion prevention detection member (wrong insertion prevention detection piece) corresponding to the wide width direction of the first cassette housing, 56 ... Wrong insertion prevention detection member (wrong insertion prevention member) corresponding to the narrow width direction of the first cassette housing Detecting piece), 61 ... Incorrect insertion prevention detecting member (erroneous insertion preventing detection piece) corresponding to the wide direction of the first and second cassette housings, 66 ... Narrow direction of the first and second cassette housings Corresponding to the wrong insertion prevention detection member (wrong insertion prevention detection piece),
To: first magnetic tape (iron oxide tape), Tm: second magnetic tape (metal tape).

Claims (5)

[Claims] 1. A first magnetic tape to be recorded / reproduced in a first recording format is wound between a pair of reels and housed in a substantially rectangular first cassette housing, and the front of the first cassette housing is stored. A front lid that is openable and closable so as to cover the first magnetic tape stretched by a loading pocket formed in a region is supported by the first cassette housing, and magnetic recording and / or recording of the first cassette housing is performed. A tape cassette for the first recording format, which is formed with an erroneous insertion prevention groove portion on the bottom surface of the first cassette housing, into which an erroneous insertion prevention detection member on the device side can be inserted to prevent erroneous insertion into the playback device A second magnetic tape, which has the same configuration and is recorded / reproduced in a second recording format, is housed in a second cassette housing having substantially the same external dimensions as the first cassette housing, and a misinsertion preventing groove is provided in front. A tape cassette for the second recording format, which is formed on the bottom surface of the second cassette housing corresponding to the groove portion for preventing the incorrect insertion of the first cassette housing, the tape cassette for preventing the incorrect insertion of the second cassette housing. The groove portion is formed to have a predetermined length that is visually shorter than the length of the erroneous insertion preventing groove portion of the first cassette housing, and is formed into a predetermined length. When inserted into the first device adopting the format, the erroneous insertion prevention detection member provided in front of the first device comes into contact with the end of the erroneous insertion prevention groove portion of the second cassette housing, and further Although it can be determined that the insertion is wrong by blocking the insertion, when the second cassette housing is inserted into the second device adopting the second recording format, it is farther than the incorrect insertion prevention detection member of the first device. Insertion of the second device provided in the Tape cassette prevention detection member is characterized by being configured so that it can be determined that the normal insertion by allowing insertion of up to a predetermined position without contacting the end of the groove for preventing erroneous insertion of the second cassette housing. 2. The tape cassette according to claim 1, wherein the first and second erroneous insertion prevention detecting members on the side of the first and second devices allow the insertion of the second cassette casing from a wide width direction. The erroneous insertion preventing groove formed on the bottom surface of the second cassette housing corresponding to the above is formed on the back surface of the concave cutout formed by cutting out a concave shape at the lower end of the front lid, via the space passage in the loading pocket. By forming a recessed groove in a substantially straight line of a predetermined length from the front wall surface portion of the loading pocket facing the recessed notch portion to the bottom surface, a recessed groove is formed in a straight line of a predetermined length. ,
Of the first and second erroneous insertion prevention detecting members that have passed through the concave cutout portion and the space passage in the loading pocket and have entered the concave groove, only the first erroneous insertion prevention detecting member has the concave groove. A tape cassette characterized in that it can be received at the end. 3. The tape cassette according to claim 1, wherein the first and second erroneous insertion prevention detection members on the side of the first and second devices allow the second cassette housing to be inserted from a direction with a wide width. The erroneous insertion preventing groove formed on the bottom surface of the second cassette housing corresponding to the above is formed on the back surface of the concave cutout formed by cutting out a concave shape at the lower end of the front lid, via the space passage in the loading pocket. By replacing the concave cutout portion up to the front wall surface portion of the loading pocket facing the concave cutout portion and forming the space passage to have a predetermined length, the concave cutout portion is passed along with the insertion operation of the second cassette housing. Then, of the first and second erroneous insertion prevention detection members that have entered the space passage in the loading pocket, only the first erroneous insertion prevention detection member is received by the front wall surface of the loading pocket. A tape cassette characterized by being constructed. 4. The tape cassette according to claim 1, wherein the first and second erroneous insertion prevention detecting members on the side of the first and second devices allow the second cassette housing to be inserted from a direction in which the width is narrow. The erroneous insertion preventing groove formed on the bottom surface of the second cassette housing corresponding to the above-mentioned groove is a straight groove having a predetermined length in a wide direction along the bottom surface from the side surface of the second cassette housing. By doing so, only the first erroneous insertion prevention detecting member of the first and second erroneous insertion prevention detecting members that has entered the concave groove due to the insertion operation of the second cassette housing is the concave groove. A tape cassette characterized in that it can be received at the end of the tape cassette. 5. A magnetic tape can be housed in a substantially rectangular cassette housing while being wound between a pair of reels, and the tensioned magnetic tape can be covered by a loading pocket formed in the front portion of the cassette housing. In the tape cassette in which a front lid that can be opened and closed is supported by the cassette housing, at least one upper edge on the upper surface side of the cassette housing or the upper edge on the front surface side of the front lid is an R surface, A notch portion having a vertical surface that prevents the erroneous insertion of the cassette housing by the erroneous insertion prevention detecting member contacting the R surface when the surface is inserted so as to face the erroneous insertion prevention detecting member on the device side. A tape cassette characterized by being formed.