JP3053157B2 - Cassette mounting mechanism of recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cassette mounting mechanism for a recording / reproducing apparatus, and more particularly, to a cassette mounting mechanism in which two types of tape cassettes having different thicknesses and sizes are inserted from a single insertion slot. The present invention relates to a cassette insertion operation stabilizing means and a cassette incorrect insertion preventing means for inserting two kinds of tape cassettes without any problem when two kinds of tape cassettes are inserted.

[0002]

2. Description of the Related Art Conventionally, as a plurality of types of tape cassettes having different case sizes, SML cassettes having different case dimensions corresponding to the recording time, such as D3 cassettes, are well known. A cassette mounting mechanism for securely inserting and mounting a cassette is disclosed in, for example,
A configuration described in JP-A-192589 is known.

[0003] Here, D3 cassette as shown in FIG. 9 (a), the front and the front lid lock member 5 for closing locking the lid 3 is housed rotatably in the cassette side walls, the front lid lock By inserting the cassette in the direction (a) in the drawing so that the member 5 and the front lid unlocking member 7 provided on the cassette holder 11 are brought into contact with each other, the front lid lock member 5 is moved (b).
To unlock the front lid. A guide groove 100 is formed on the bottom surface of the cassette in the front-rear direction. By sliding the guide groove 100 and a guide 12 provided on the cassette holder 11, erroneous insertion of the cassette is prevented. Therefore, the D3 cassette contains
A plurality of cutouts each having a predetermined height L from the bottom surface of the cassette are provided. The cassette is provided with an insertion restricting member 22 for restricting the (a) direction insertion operation, and is positioned in contact with the stepped portion 8 (fixed portion that does not rotate) of the cassette.

[0004] Incidentally, there are 8 mm video cassette, as shown in FIG. 9 (b) as the same configuration as the D3 cassette. Here, the difference between the 8 mm video cassette and the D3 cassette is that there is no stepped portion 8 on the front surface of the front cover 3.

[0005]

In recent years, in a recording / reproducing apparatus (VTR) such as a video camera, further reduction in size and weight has been desired, and technical developments relating to this have been made in various fields. . In general, the size of the VTR mechanism is determined by the shapes of the cylinder and the cassette. Therefore, in order to reduce the size of the mechanism, the size of the cylinder and the cassette must be reduced. Therefore, the diameter of the cylinder has been reduced by increasing the rotation speed and increasing the tape wrapping angle, etc., and the cassette has been working on a new cassette having a smaller outer dimension than the 8 mm video cassette. I have.

By the way, in order to make the new cassette as thin as possible, it is necessary to form the guide groove 100 for preventing erroneous insertion described in the above D3 cassette from the viewpoint of space in terms of space. There is a problem that it is not possible. Accordingly, the front portion of the new cassette is thinned is a structure having no stepped portion 8 between the front lid and the cassette bottom as 8 mm video cassette described in FIG. 9 (b). Further, in the case of a system using a plurality of cassettes having different forms as described above, it is necessary to take a measure for securely inserting and mounting each cassette without using the guide groove guide system. Further, when the cassette has a structure without the stepped portion 8 as described above, the cassette is operated stably without providing a guide groove for avoiding a lid unlocking member having a different position depending on the cassette size. A strategy is also needed.

Referring to FIG. 8 , a description will be given of a large and small cassette based on a current 8-mm video cassette and a cassette holder for inserting the cassette.

In FIGS. 8 (a) and 8 (b), reference numeral 1 denotes a small cassette (a cassette having a reduced external dimension of a current 8 mm video cassette), 2 denotes a large cassette (a cassette having an enlarged external dimension), and 11
Is a cassette holder, 12a and 12b are guide regulating members fixed to the cassette holder at intervals slightly larger than the width W of the small cassette, and 7 is a first lid unlocking member for unlocking the front lid of the small cassette. , 22 and 22 are first insertion regulating members for regulating the insertion of the small cassette. Reference numeral 18 denotes a second lid unlocking member for unlocking the front lid of the large cassette, and reference numerals 17 and 17 denote second insertion restricting members. Here, the reason why the insertion regulating members are provided in the large and small cassettes is that the opening 101 of the small cassette and the opening 102 of the large cassette are different.

That is, when a thin large and small cassette is constructed based on an 8 mm video cassette, it is necessary to separately provide guide restricting members 12a and 12b for the small cassette, and a lid lock releasing member and an insertion restricting member are provided for each of the large and small cassettes. In this case, when the large cassette 2 is inserted, the large cassette 2 abuts the guide restriction members 12a and 12b for the small cassette, or the large cassette 2 and the first cassette There is a problem that the large cassette 2 cannot be inserted to the predetermined insertion end position because the lid lock release member 7 abuts or the large cassette 2 abuts the first insertion regulating member 22.

An object of the present invention is to provide a recording / reproducing apparatus having a cassette mounting mechanism for selectively inserting two types of tape cassettes, large and small, into the apparatus. In addition to preventing the problem that the upper member abuts and cannot be inserted to the predetermined position, the operation is reliable and the cost can be reduced.
An object of the present invention is to provide a cassette mounting mechanism for a recording / reproducing apparatus.

[0011]

In order to achieve the above object, the present invention has the following configuration. That is, a first tape cassette having a front lid and a front lid lock portion for closing and locking the front lid, and a second tape cassette having a case size larger than the first tape cassette are selectively provided. A cassette mounting mechanism of a recording / reproducing device to be mounted,
A cassette holder into which the first and second tape cassettes are inserted; and moving means provided in a divided manner on the left and right sides of the cassette holder, wherein the moving means is provided on the front cover of the first tape cassette. A lid unlocking section for unlocking the lock section, and when the second tape cassette is inserted, the lid unlocking section is moved to a position where insertion of the second tape cassette is not hindered. It is configured to be moved.

[0012] Also, before Symbol moving means, and having a first guide portion for restricting the lateral position of said first tape cassette when said second tape cassette is inserted, wherein the first guide section, shall be the structure to move to a position where insertion of the second tape cassette is not inhibited. Also, the lid lock releasing section and the first guide portion has a structure formed by integrally provided on the moving means. Further, the moving means has an insertion restricting portion for restricting a position of the first tape cassette in the inserting direction, and when the second tape cassette is inserted, moves the insertion restricting portion to the second tape cassette. Is moved to a position where the insertion of the tape cassette is not hindered.
Further, the lid lock releasing section and the insertion restriction portion shall be the structure formed by integrally provided on the moving means.
Also, the first guide portion and the insertion restriction portion shall be the structure formed by integrally provided on the moving means. Also,
The lid unlocking section, the first guide section, and the insertion restricting section are provided integrally with the moving means. Further, the moving means has a contact portion that contacts the second tape cassette, and when the second tape cassette is inserted, the contact portion is pressed to move the moving means. Configuration. Ma
And, pre-SL contact portion, the lid lock releasing section, said first guide portion and the insertion restriction portion has a structure formed by integrally provided on the moving means. The contact portion has a tapered portion inclined with respect to the insertion direction of the first and second tape cassettes. Also,
The moving means is provided so as to be rotatable around a predetermined axis with respect to the cassette holder. Further, a second guide portion is provided on the cassette holder and regulates a vertical position and a horizontal direction of the first tape cassette and a vertical position of the second tape cassette. Further, the moving means is provided so as to be divided into right and left sides of the cassette holder. Further, the moving means is configured to be attached to the cassette holder on both left and right sides as viewed in the left-right direction of the cassette holder, and to have a configuration in which the center side is vertically displaced.

[0013]

Operation If the cassette mounting mechanism is configured as described above,
The second tape cassette inserted into the cassette holder moves the contact member, and in accordance with this operation, the contact member contacts the first insertion regulating member and the first lid unlocking member with the second tape cassette. In order to move to a retracted position where the second tape cassette is not in contact with the second tape cassette and the first insertion restricting member when the second tape cassette is inserted, or the second tape cassette and the first lid lock The contact operation with the release member can be prevented, and the stable insertion operation can be performed.

Further, by integrally providing the contact member, the first lid unlocking member, and the first insertion restricting member, the first insertion restricting member and the first lid unlocking member by the contact member are provided. Can be reliably performed, and the cost of the cassette mounting mechanism can be reduced by integration.

[0015]

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

First, a first embodiment of the present invention will be described with reference to FIGS. 1, 2 and 3.

In FIG. 1A, reference numeral 1 denotes a first tape cassette, and 2 denotes a second tape cassette. Each of the tape cassettes has a first front cover 3 and a second front cover 4 which can be opened forward. ing. Reference numeral 5 denotes a locking member for the front lids 3 and 4, which is a claw for engaging the locked member 6 to lock the front lid, and a contact portion 9 for contacting a first lid lock release member 7 described later. And can rotate around the shaft 5a.
Is always biased in the locking direction.

In FIGS. 2 and 3, reference numeral 11 denotes a cassette holder, which is composed of a flat plate and left and right side plates formed by folding the flat plate end.

At the left and right ends of the flat plate, 13 and 1
Reference numeral 4 denotes a second moving body, which is a second moving body 13 on the left side.
As shown in FIG. 1B, the lower surface of the cassette holder 11 can be slid in the a or b direction by a groove 16 which engages with a pin 15. In addition, the second moving body 13
As shown in FIG. 2, the second insertion regulating member 17, the second lid unlocking member 18, the cassette pushing member 1
9 as a unit. 20 indicates that the second mobile unit 13 is always b
It is a tension spring for urging in the direction.

Next, FIG.
However, the first moving body 21 as shown in FIG. In the first moving body 21, reference numeral 22 denotes a first insertion regulating member,
Reference numeral 7 denotes a first lid unlocking member, and 23 denotes rollers (contact members) rotatable around a shaft 24, which are integrally attached to the first moving body 21. First moving object 2
1 is rotatable between a use position shown by a solid line in FIG. 1A and a retracted position shown by a dotted line in FIG. 1A by a rotation shaft 25, and is always used by a torsion spring 26. It is urged toward.

A similar first moving body 27 and second moving body 14 are also provided on the right side of the cassette holder flat plate in FIG.
Are attached, and the right first second moving body and the left first second moving body have a left-right symmetrical relationship and have the same configuration. A detailed description is omitted. The difference is that the mobile unit 13 on the left
21 is that only the first and second lid unlocking members are provided.

Next, the operation of the first embodiment of the present invention will be described.

In the configuration shown in FIG. 1A, first, when the first tape cassette 1, which is a small cassette, is inserted, the lock member 5 of the front lid comes into contact with the first lid unlocking member 7, and the dotted line indicates the solid line. The lock on the front lid is released to rotate in the direction shown by. Further, the front surface of the first tape cassette 1 comes into contact with the first insertion regulating member 22. Then, when the first tape cassette 1 is further pushed in from this state, the first moving body 21 pushed by the cassette 1 is pushed.
FIG. 1 shows the second moving body 13 connected to the second moving body 13 in FIG.
(B) In the direction indicated by the middle arrow a and the cassette holder 1
In order to slide the cassette 1 with respect to the first and second moving bodies, the first and second moving bodies are stopped when they move to a position where the pin 15 and the groove 16 abut, and the insertion operation of the cassette 1 ends in this state. In this insertion operation, the first tape cassette 1 is guided by a guide restricting member (not shown) in the insertion direction shown by the arrow (a) in FIG.

Next, in the configuration shown in FIG. 1A, when the second tape cassette 2, which is a large cassette, is inserted, the roller 23 is pushed downward by the insertion force of the second tape cassette 2. Therefore, the first moving body 21 provided with the roller 23 moves from the use position shown by the solid line in FIG. 1A to the retreat position shown by the dotted line around the rotation shaft 25 against the urging force of the torsion spring 26. It will be pivotally moved until. As a result, the first lid unlocking member 7 and the first insertion restricting member 23 provided integrally with the first moving body 21 are also lowered, and the second tape cassette 2 in the insertion posture is moved downward. Is retracted to a position where it does not come into contact with the first tape lock release member 7 and the first insertion restricting member 23, thereby avoiding contact with the second tape cassette 2.

Then, by further pushing the second tape cassette 2 from this state, the lock of the front cover 4 is released and the insertion of the cassette 2 is completed similarly to the above-described operation of inserting the first tape cassette 1. Position is regulated by position.

When the insertion posture of the first or second tape cassette is detected as a result of these operations, the cassette holder 11 moves from horizontal to vertical along the guide groove 103 shown in FIG. After the first or second tape cassette is mounted at a predetermined position in the apparatus, and after recording / reproducing, a cassette discharging operation for moving the cassette holder 11 is performed in reverse to the mounting operation described above. As shown in b), the pin 30 fixed to the tip of the arm 29 that rotates about the shaft 28 is in contact with the upright member 19 integrated with the second moving body. A cassette pushing mechanism (not shown) connects the first and second moving bodies to each other.
By rotating the arm 29 to move in the direction, the first and second moving bodies
, And the cassette 1 is pushed out.

Next, referring to FIGS. 4, 5, 6, and 7,
A second embodiment of the present invention will be described.

When the configuration of the second embodiment shown in these figures is compared with the configuration of the first embodiment shown in FIGS. 1, 2 and 3, the cassette holder 11 and the second moving body 21 The configurations are equivalent. The difference is that the configuration and operation of the first mobile unit 21 are different. Therefore, the configuration and operation of the first moving body 21 will be described in detail with reference to the drawings.

In FIG. 4, the first moving body 21 on the left side of the cassette holder is fixed to the second moving body 13 by fastening means such as screws or welding means (for example, spot welding). The member 7 and the first insertion regulating member 22 are integrally provided. Reference numeral 12a denotes a guide member (contact member), which is provided integrally with the first moving body 21. Similarly, the first movable body 27 on the right side of the cassette holder is also fixed to the second movable body 14 by the fastening means or the welding means, and integrally includes the first insertion regulating member 22 and the guide member 12b. ing.

Here, the guide members 12a and 12b
Are arranged slightly wider than the width of the first tape cassette 1 as shown in FIG.

That is, in the case of the first embodiment described above,
In contrast to the first moving body, which has been rotated and retracted in parallel with the cassette insertion direction, in the second embodiment, as shown in FIG. 7, the guide member 12a is pushed down. Thus, the first movable body 21 is retracted and moved substantially perpendicularly to the cassette insertion direction. Further, in the second embodiment, the contact member that contacts the second tape cassette 2 is replaced with the first tape cassette 1.
The device also serves as guide members 12a and 12b for guiding the insertion of the device, thereby reducing the cost of the device.

In FIGS. 4 and 5, reference numerals 31a and 31b denote second guide members for guiding the upper left and right of the first tape cassette 1, and are integrally attached to the leaf springs 32a and 32b. 6B, and is movable between a position indicated by a solid line and a position indicated by a dotted line in FIG.

Next, the operation of the second embodiment will be described.

In the configuration shown in FIGS. 6 and 7, when the first tape cassette 1, which is a small cassette, is inserted in the insertion direction,
First, since the second guide members 31a and 31b come into contact with the front upper right and left sides of the first tape cassette 1, the side of the first tape cassette 1 in the inserted posture is guided and the first tape cassette 1 It is urged downward. Thereafter, when the cassette 1 is further pushed in, the first guide members 12a and 12a
Since the cassette 2b comes into contact, the cassette is reliably guided. Then, as a result, when it is inserted to the predetermined position shown in FIG. 6A, the first lid unlocking member 7 unlocks the front lid similarly to the above-described first embodiment, and the first lid unlocking member 7 unlocks the first lid. The insertion restricting member 22 restricts insertion of the cassette 1.

On the other hand, in the configuration shown in FIGS. 6 and 7, when the second tape cassette 2, which is a large cassette, is inserted in the insertion direction, the second guide members 31a and 31b
As shown in (b), the inserted cassette 2 comes into contact with the front upper portion, is flipped up, retreats to the position shown by the dotted line, and is urged downward by the leaf spring. Thereafter, when the cassette 2 is further pushed in and inserted to a predetermined position shown in FIG. 6, according to the operation,
When the lower portion of the cassette 2 comes into contact with the guide members 12a and 12b, the guide member 12a is pushed down from the solid line to the position indicated by the dotted line as shown in FIG. By this operation, the first lid unlocking member 7 and the first insertion regulating member 22 integrated with the guide member 12a are similarly pushed down, so that the cassette 2 is The first insertion regulating member can be inserted to a predetermined position without contacting the first insertion regulating member.

In this embodiment, the structure of the contact member is integral with the first moving body 21 as shown in FIG. 4, but is shown in FIG. 1 or FIG. 2 in order to reduce the load when inserting the cassette. The roller 23 may have a structure.

[0037]

As described above, according to the cassette mounting mechanism of the recording / reproducing apparatus of the present invention, the lid unlocking member for unlocking the front cover of the small cassette and the insertion regulating member for inserting and positioning the small cassette. A contact member capable of contacting only with the large cassette inserted in the cassette holder, and by contacting the contact member with the large cassette, the lid unlocking member for the small cassette is provided. And the insertion restricting member are retracted to a position where they do not come into contact with the large cassette, so that when the large cassette is inserted, the cassette and the member on the cassette holder are in contact with each other and cannot be inserted to the predetermined position. And the contact member, the lid unlocking member for the small cassette, and the insertion regulating member. Since the integral structure can operate it is reliable, and provides a cassette loading mechanism of cost reduction possible recording and reproducing apparatus.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an operation of a first embodiment of the present invention.

FIG. 2 is an external perspective view showing the configuration of the first embodiment of the present invention.

FIG. 3 is an exploded perspective view of the configuration of FIG. 2;

FIG. 4 is a perspective view illustrating a configuration of a lower portion of a cassette holder according to a second embodiment of the present invention.

FIG. 5 is a perspective view showing a configuration of an upper portion of a cassette holder.

FIG. 6 is an explanatory diagram showing the operation of the second embodiment of the present invention.

FIG. 7 is an enlarged view of a main part in the configuration of FIG. 6;

FIG. 8 is an explanatory view showing a configuration of a conventional cassette holder.
is there.

FIG. 9 is an explanatory diagram of a conventional tape cassette.

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Noriaki Masuda 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Hitachi, Ltd. Video Media Research Laboratories (72) Inventor Hikaru Mizutani 1-188 Ushitora, Ibaraki-shi, Osaka No. Hitachi Maxell, Ltd. (72) Inventor Katsuo Maehara 1-88 Ushitora, Ibaraki-shi, Osaka Pref. Hitachi Maxell, Inc. (56) References JP-A-63-55754 (JP, A) 57-191966 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 15/665 601 G11B 15/665 640 G11B 15/675 101

Claims (19)

(57) [Claims] 1. A first tape cassette having a front lid and a front lid lock portion for closing and locking the front lid, and a second tape cassette having a case size larger than the first tape cassette. A cassette mounting mechanism of a recording / reproducing apparatus that is selectively mounted, comprising: a cassette holder into which the first and second tape cassettes are inserted; and moving means provided in a divided manner on the left and right sides of the cassette holder. The moving means has a lid unlocking section for unlocking the front lid locking section of the first tape cassette, and the lid lock is inserted when the second tape cassette is inserted. A cassette mounting mechanism for a recording / reproducing apparatus, wherein a release unit is moved to a position where insertion of the second tape cassette is not hindered. 2. A cassette mounting mechanism of a recording / reproducing apparatus in which a first tape cassette and a second tape cassette having a case size larger than that of the first tape cassette are selectively mounted. A cassette holder into which first and second tape cassettes are inserted; and moving means provided in a divided manner on the left and right sides of the cassette holder, wherein the moving means moves the position of the first tape cassette in the left-right direction. Having a first guide portion for regulating, and when the second tape cassette is inserted, moving the first guide portion to a position where insertion of the second tape cassette is not hindered. A cassette mounting mechanism for a recording and reproducing apparatus. 3. The moving means has a first guide portion for regulating the position of the first tape cassette in the left-right direction, and when the second tape cassette is inserted, the moving means has a first guide portion. 2. The cassette mounting mechanism for a recording / reproducing apparatus according to claim 1, wherein one guide portion is moved to a position where insertion of the second tape cassette is not hindered. 4. The cassette mounting mechanism according to claim 3, wherein said lid unlocking section and said first guide section are provided integrally with said moving means. A first tape cassette wherein a front cover of the front cover having a front lid lock section for closing the lock, a larger second tape cassette case size than said first tape cassette A cassette mounting mechanism of a recording / reproducing apparatus to be selectively mounted, comprising: a cassette holder into which the first and second tape cassettes are inserted; and a moving unit provided in the cassette holder. Has a lid unlocking section for unlocking the front lid locking section of the first tape cassette, and an insertion regulating section for regulating the position of the first tape cassette in the insertion direction, When the second tape cassette is inserted, the lid unlocking portion is moved to a position where the insertion of the second tape cassette is not hindered, and Recording and reproducing apparatus of the cassette loading mechanism, characterized in that to move the part to the insertion is not hindered position of the second tape cassette. 6. The cassette mounting mechanism for a recording / reproducing apparatus according to claim 5, wherein said lid unlocking section and said insertion restricting section are provided integrally with said moving means. 7. A cassette mounting mechanism of a recording / reproducing apparatus in which a first tape cassette and a second tape cassette having a case size larger than that of the first tape cassette are selectively mounted. A cassette holder into which first and second tape cassettes are inserted; and a moving unit provided in the cassette holder, wherein the moving unit is configured to control a position of the first tape cassette in the left-right direction. One guide portion, and an insertion restricting portion that regulates the position of the first tape cassette in the insertion direction, and when the second tape cassette is inserted, the first guide portion is Moving the insertion of the second tape cassette to a position where the insertion of the second tape cassette is not hindered. Cassette loading mechanism of the recording and reproducing apparatus according to symptoms. 8. A cassette mounting mechanism for a recording / reproducing apparatus according to claim 7, wherein said first guide portion and said insertion restricting portion are provided integrally with said moving means. 9. A first tape cassette having a front lid, a front lid lock portion for closing and locking the front lid, and a second tape cassette having a case size larger than the first tape cassette. A cassette mounting mechanism of a recording / reproducing apparatus to be selectively mounted, comprising: a cassette holder into which the first and second tape cassettes are inserted; and a moving unit provided in the cassette holder. A lid unlocking section for unlocking the front lid locking section of the first tape cassette, and a first guide section for regulating the position of the first tape cassette in the left-right direction, And an insertion restricting portion for restricting the position of the first tape cassette in the insertion direction, and when the second tape cassette is inserted, the lid lock release portion is Moving the second tape cassette to a position where the insertion of the second tape cassette is not hindered, and further moving the first guide portion to a position where the insertion of the second tape cassette is not hindered. A cassette mounting mechanism for a recording / reproducing apparatus, which is moved to a position where insertion of a tape cassette is not hindered. 10. The cassette according to claim 9, wherein said lid unlocking portion, said first guide portion and said insertion restricting portion are provided integrally with said moving means. Mounting mechanism. 11. The moving means has a contact portion that comes into contact with the second tape cassette, and when the second tape cassette is inserted, the contact portion is pressed to move the moving device. 11. The cassette mounting mechanism for a recording / reproducing apparatus according to claim 1, wherein the means is moved. 12. The moving means has a contact portion that comes into contact with the second tape cassette, and when the second tape cassette is inserted, the contact portion is pressed to move the moving device. The device according to claim 9, wherein the contact unit, the lid unlocking unit, the first guide unit, and the insertion restricting unit are integrally provided with the moving unit while moving the unit. Cassette mounting mechanism for recording and playback devices. 13. The device according to claim 11, wherein the contact portion has a tapered portion inclined with respect to the insertion direction of the first and second tape cassettes. Cassette mounting mechanism of the recording / reproducing device. 14. The recording / reproducing apparatus according to claim 1, wherein said moving means is provided so as to be rotatable around a predetermined axis with respect to said cassette holder. Cassette mounting mechanism. 15. A method according to claim 15, further comprising a second guide portion provided on said cassette holder for regulating a vertical position and a horizontal direction of said first tape cassette and a vertical position of said second tape cassette. Claim 1 characterized by the following:
A cassette mounting mechanism for the recording / reproducing apparatus according to claim 14. 16. The moving means according to claim, characterized in that thus provided for the divided form to the right and left of the cassette holder
A cassette mounting mechanism for the recording / reproducing apparatus according to any one of claims 5 to 15. 17. The apparatus according to claim 17, wherein the moving means is attached to the cassette holder at both left and right sides as viewed in the left-right direction of the cassette holder, and has a structure in which the center is vertically displaced. Item 17. A cassette mounting mechanism for the recording / reproducing device according to Item 16. 18. A first tape cassette having a front lid and a front lid lock portion for closing and locking the front lid, and a second tape cassette having a case size larger than that of the first tape cassette. A cassette mounting mechanism of a recording / reproducing apparatus to be selectively mounted, comprising: a cassette holder into which the first and second tape cassettes are inserted; and a moving unit provided in the cassette holder. Has an insertion restricting portion for restricting the position of the first tape cassette in the insertion direction, and when the second tape cassette is inserted, the insertion restricting portion is inserted into the second tape cassette. A cassette mounting mechanism for the recording / reproducing apparatus, wherein the cassette mounting mechanism is moved to a position where it is not hindered. 19. A first tape cassette having a front lid and a front lid lock portion for closing and locking the front lid, and a second tape cassette having a case size larger than the first tape cassette. A cassette mounting mechanism of a recording / reproducing apparatus that is selectively mounted, wherein a cassette holder into which the first and second tape cassettes are inserted; and a vertical direction of the first tape cassette provided in the cassette holder. A cassette mounting mechanism for the recording / reproducing apparatus, comprising a guide portion for regulating the position in the left-right direction and the vertical direction of the second tape cassette.