JP2001319457A - Magnetic tape cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make insertable a leader pin into a case even when the insertion pass of the leader pin into the case is deviated due to variation, etc., based on the error of the inserting position of the leader pin by a recording and reproducing device, in a magnetic tape cartridge where a single reel with a magnetic tape wound thereon is housed rotatably in a cartridge case and the leader pin for drawing out the tape fixed to the tip part of the magnetic tape is held attachably and detachably in the case in the mode of engaging flanges on both of its upper and lower ends by energizing force applied from a lateral side by a latch spring fixed in the case. SOLUTION: The inclination angle α of the introducing face 31 of a latch spring 30 abutting on the flange 5c of the leader pin 5 with respect to the inserting direction of the leader pin 5 at a contact point with the flange 5c is set to be 30 deg.±5 deg..

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic tape cartridge in which a single reel on which a magnetic tape is wound is rotatably housed in a cartridge case.
The present invention relates to a latch spring structure for detachably holding a tape pull-out leader pin fixed to a leading end of a magnetic tape in an opening of a cartridge case, and a lock structure of a slide door for opening and closing the opening.

[0002]

2. Description of the Related Art Conventionally, as a magnetic tape cartridge used as a recording medium for an external storage device such as a computer, for example, a single unit having a magnetic tape wound thereon as disclosed in Japanese Patent Application Laid-Open No. H11-242870. A type in which one reel is rotatably accommodated in a cartridge case is known. In this type of magnetic tape cartridge, the tape pull-out leader pin fixed to the leading end of the magnetic tape is locked by a biasing force applied from the side by a latch spring fixed in the case. In this aspect, the apparatus is configured to be detachably held in the case.

FIGS. 23 and 24 are a longitudinal sectional view and a partial sectional plan view of a main part showing the structure of the leader pin holding portion described in the above publication.

In FIG. 23 and FIG. 24, a cartridge case 4 made of a synthetic resin includes an upper half 2 and a lower half 3 which are connected to each other. A single reel (not shown) on which the fixed magnetic tape is wound is rotatably accommodated. An opening 8 for drawing out a magnetic tape is formed in one side wall of the cartridge case 4, and a slide door 20 movable in a direction parallel to the side wall of the cartridge case 4 is attached to the opening 8. . The slide door 20 is urged by a door spring (not shown) in a direction to close the opening 8.

[0005] In the vicinity of the opening 8 of the magnetic tape cartridge, a recess 9 for accommodating a leader pin is formed. When the magnetic tape cartridge is not used, the leader pin 5 is held in a state where the magnetic tape is completely wound around the reel. A latch spring 30 for detachably holding the inside of the recess 9 is mounted.

When the magnetic tape cartridge is loaded into a recording / reproducing device such as an external recording device, the slide door 20 is opened, and the leader pin 5 is pulled out by a robot arm provided in the recording / reproducing device. Is drawn into a predetermined position on the tape traveling path, and data can be read from and written to the magnetic tape.

As is apparent from FIG. 23, the leader pin 5 has a shaft-shaped tape clamp portion 5a at the center thereof which is wound around the tip of the magnetic tape and clamped by fitting a clamp member 5e having a C-shaped cross section. Thin plate-like flanges 5d, 5d are continuously provided on the upper and lower ends of the tape clamp portion 5a. Further, on the outer side of the flanges 5d, 5d in the axial direction, a thin shaft portion engaged with and held by a robot arm of the recording / reproducing apparatus. 5
Column-shaped flanges 5c, 5c are formed with d and 5d therebetween.

The latch spring 30 has a shape as shown in FIG. 25, for example, and is composed of a leaf spring sandwiched between upper and lower halves 2 and 3. Flanges 5c and 5c at both upper and lower ends of the leader pin 5 are connected to the upper and lower halves. , 3 are respectively inserted into the leader pin storage recesses 9, and the flanges 5 c, 5 c are detachably held by a latch spring 30.

As shown in FIG. 25, a latch spring 30 having a substantially U-shaped planar shape and formed vertically symmetrically.
Is provided with a pair of arms 30b, 30b extending substantially parallel to the back plate 30c from the upper and lower ends of the connection base 30a, and holding portions 30d of the leader pin 5 are respectively provided at the tips of the upper and lower arms 30b, 30b. The upper and lower arms 30b are cut off so that only the holding portion 30d is in contact with the outer peripheral surface of the flange 5c of the leader pin 5 from the side. Each holding portion 30d protrudes in a chevron shape, and a leader pin introduction surface 31 (FIG. 24) which forms an inclined surface is formed on the tip end side of the holding portion 30d. When the leader pin 5 is inserted into the case 4 while being held by the robot arm, the introduction surface 31 first
The outer peripheral surface of the flange 5c abuts, the arm 30b of the latch spring 30 is elastically displaced to the side by being pushed by the flange 5c, and the insertion of the leader pin 5 into the recess 9 is enabled. . As shown in FIG. 24, the flange 5c of the leader pin 5 passing through the introduction surface 31 is
By d, it is elastically pressed and held on the inner wall surface of the concave portion 9.

Also, a latch spring 30 of this type is used.
Is connected to the connecting base 3 with the fastening of the upper and lower halves 2 and 3.
0a and the upper and lower edges of the back plate 30c
3 for clamping and fixing.

[0011]

A detailed observation of the state when the leader pin 5 is inserted into the case 4 through the opening 8 is as shown in FIG. 26.

When the leader pin 5 is inserted into the case 4, the leader pin storage recess 9 has linear guide walls 9 a and 9 b for guiding the flange 5 c of the leader pin 5 to the depth of the recess 9, and the flange 5 c. And a semicircular holding wall 9c having a diameter slightly larger than the radius of the holding wall 9c.

Originally, the leader pin 5 has its center axis S
Is designed to be inserted into the recess 9 along a center line L1 passing through the center of curvature P of the semicircular holding wall 9c at the back of the recess 9 and perpendicular to the side surface of the case 4 on the opening 8 side. When the flange 5c of the pin 5 comes into contact with the leader pin introduction surface 31 at the tip of the latch spring 30, the introduction surface 31 is pushed by the flange 5c, so that the arm 30b is displaced laterally (to the left in the drawing). In addition to allowing the leader pin 5 to be inserted into the recess 9, the flange 5 c that has passed through the introduction surface 31 and has been inserted into the recess 9 is held by the holding portion 30 d of the latch spring 30 so that the holding wall 9 c of the recess 9 is held.
And is elastically pressed and held.

However, the center axis S of the leader pin 5 deviates left and right from the center line L1 of the concave portion 9 due to a variation in the relative position between the magnetic tape cartridge loaded in the recording / reproducing apparatus and the robot arm of the recording / reproducing apparatus. In some cases, the opening 8 side of the recess 9 is widened and the guide walls 9a and 9b are formed as inclined surfaces that open outward, so that the center axis S of the leader pin 5 is set. Even when the leader pin 5 is inserted in a state in which the central axis S deviates from the center line L1, the guide wall surfaces 9a and 9b are configured to guide the flange 5c so that the center axis S is directed to the center of curvature P of the holding wall surface 9c. I have.

However, since the position of the introduction surface 31 of the latch spring 30 varies, as shown in FIG. 26, the flange 5c of the leader pin 5 is guided by the guide wall surface 9a on the latch spring 30 side. When inserted into the recess 9, the arm portion 30b of the latch spring 30 is not deviated to the side only by pressing the introduction surface 31 by the flange 5c.
There was a problem that insertion into the inside became impossible.

The introduction surface 31 of the latch spring 30
Is provided so as to have a predetermined inclination angle α ′ with respect to a straight line L2 parallel to the center line L1. Incidentally, conventionally, the inclination angle α ′ was set to 55 °. Since the angle between the guide wall 9a of the recess 9 on the latch spring 30 side and the straight line L2 is set to 10 °, the introduction surface 31 and the guide wall 9 on the latch spring 30 side are set.
The angle β 'made with a was 45 °.

For this reason, the flange 5c of the leader pin 5
Is inserted into the recess 9 in such a manner that the arm 30b is guided by the guide wall surface 9a, and the arm portion 30b may not be displaced to the side even if the introduction surface 31 of the latch spring 30 is pushed by the flange 5c. The result was.

On the other hand, as the latch spring for pressing and holding the leader pin 5 in the recess 9 for storage, various types other than those described above have been proposed. When the latch spring is attached to the cartridge case 4, Depending on the shape of the latch spring and its mounting structure, an error occurs in the amount of protrusion of the leading end of the leader pin holding portion with respect to the storage recess 9, and the locking force of the leader pin holding portion with respect to the leader pin fluctuates. 9 has a problem that the attachment and detachment of the leader pin 5 to and from the connector 9 become unstable.

In particular, when the latch spring attached to the upper half 3 and the latch spring attached to the lower half 4 are separate members, the upper and lower locking forces of the leader pin 5 are different, and the leader pin 5 may be inclined at the time of attachment / detachment. There is. If the amount of protrusion of the leader pin holding portion is small and its locking force is weak, the leader pin 5 may come off from the concave portion 9 due to vibration or the like during storage. There is a possibility that the latch spring is deformed when the pin 5 is stored, and in any case, it is a factor of causing the attachment / detachment failure of the leader pin 5 and the reliability of the loading operation may be impaired.

As a mounting structure of the upper and lower separate latch springs, a form as shown in FIG. 27 can be considered. This latch spring 55 is configured as a vertical separate body by a wire spring,
At the tip, a leader pin holding portion 55a is provided which comes into contact with the flange 5c of the leader pin 5.
An arm portion 55b extending in a direction opposite to the opening 8 from the opening 5 is provided, and a mounting portion bent into a substantially L-shape at the root portion in a bending groove 56a of a fixing portion 56 formed at the rear end of the concave portion 25 on the inner surface of the case. 55d is fitted and fixed, whereby the latch spring 55 is held at a predetermined position.

However, if the fixing position of the latch spring 55 is supported only at the rear end position of the arm portion 55b farthest from the contact position with the leader pin 5 as described above, the minuteness of the mounting portion 55e of the fixing portion 56 is small. The displacement of the fixing position affects the leader pin holding portion 55a at the tip, and the amount of protrusion of the leader pin holding portion 55a with respect to the concave portion 9 fluctuates. It is easy to be. Also, in a structure in which the mounting portion at the rear end of the arm portion of the latch spring 55 is fixed by the thermal fusion of the protruding fixing portion, if the fixing of the mounting portion by the fixing portion shifts, the locking is performed in the same manner as described above. The force will fluctuate.

Further, in the magnetic tape cartridge as described above, the sliding door 20 for opening and closing the opening 8 for pulling out the magnetic tape is not affected by a drop impact or the like when the cartridge is not in use, such as when the cartridge is stored or transported. Since there is a possibility that foreign matter may enter into the interior through the opening 8 and open, it is reliable not only to be urged in the closing direction by the door spring but also to lock it so that it does not open carelessly. It is desirable in terms of enhancing the properties.

In view of the above-mentioned circumstances, a first object of the present invention is to provide a recording / reproducing apparatus side member in which a leader pin is inserted into a magnetic tape cartridge due to an error in the insertion position and a variation in a latch spring. It is an object of the present invention to provide a latch spring structure capable of always smoothly inserting a leader pin into a cartridge case irrespective of variation in the position of an introduction surface.

A second object of the present invention is to provide a magnetic tape cartridge provided with a latch spring which ensures the positional accuracy of the leader pin holding portion, stabilizes the locking force, and enables reliable loading. It is in.

A third object of the present invention is to provide a magnetic tape cartridge in which a sliding door in a closed state is locked to enhance reliability.

[0026]

According to a first aspect of the present invention, a single reel on which a magnetic tape is wound is rotatably housed in a cartridge case, and a tape for pulling out the tape is fixed to a leading end of the magnetic tape. The leader pin is detachably held in the case by a biasing force applied from both sides by a latch spring provided in the case to both ends thereof, and the latch spring holds the leader pin in the case. An introduction surface that is deflected laterally by the leader pin when inserted to enable the leader pin to be inserted into the case, and retains the leader pin passing through the introduction surface in the case. A magnetic tape cartridge comprising: a holding portion that contacts the leader pin in the insertion direction of the leader pin on the introduction surface at the contact point with the leader pin. The inclination angle of the latch spring is set to an angle at which the latch spring is deflected to the side by an operation of being merely pushed by the leader pin regardless of the insertion position of the leader pin into the case. It is assumed that.

More specifically, the inclination angle of the introduction surface at the contact point with the leader pin with respect to the insertion direction of the leader pin may be set within a range of 30 ° ± 5 °.

In the second invention of the present application, a single reel on which a magnetic tape is wound is rotatably housed in a cartridge case, and a tape pulling-out leader pin fixed to a leading end of the magnetic tape includes: In a magnetic tape cartridge which is detachably held in the case by an urging force applied from both sides by a latch spring provided in the case to both ends thereof, the latch spring contacts the leader pin. At least one bent portion is provided between the holding portion at the distal end and the fixed portion fixed to the cartridge case, and the bent portion is supported by a fulcrum member to allow the holding portion and the bent portion to move between the holding portion and the bent portion. The arm portion is configured to be elastically deformed, and when the distance between the fulcrum member and the leader pin holding portion is L, the fulcrum member and the fixed member are fixed. Distance between S is characterized in that it is set so as to satisfy S ≧ (1/3) L of the relationship. The bending angle of the bent portion may be approximately 180 ° or approximately 90 °.

Further, according to the third invention of the present application, a single reel on which a magnetic tape is wound is rotatably accommodated in a cartridge case, and an opening for pulling out the magnetic tape into the cartridge case; A magnetic tape cartridge provided with a slide door that opens and closes a unit, wherein the slide door is an opening operation unit that moves the slide door in an opening direction by abutting a door operating member of the recording / reproducing device; A lock portion that engages with the engagement portion of the case, locks the slide door in the closed position, and releases the engagement with the engagement portion in conjunction with the contact of the door operating member with the open operation portion. Are provided.

Specifically, the lock portion is provided at an upper portion or a lower portion of a front portion of the slide door, and a contact surface of the opening operation portion with the door operating member is linked to the contact of the door operating member. Thus, the sliding door can be formed on an inclined surface that moves the front part of the sliding door in a direction in which the engagement between the locking part and the engaging part is released.

Further, the lock portion is provided in the opening operation portion of the slide door, and the engagement between the lock portion and the engagement portion is released in conjunction with the contact of the door operating member with the opening operation portion. The opening operation part may be configured to move or deform in a direction. In this case, it is preferable that cut grooves are formed on the upper and lower sides of the opening operation section so that the opening operation section is easily deformed in the unlocking direction.

Further, the lock portion is formed on a lock member movably provided on the slide door, and the lock member is locked by sliding in the opening direction of the slide door by contact of the door operating member. A release member that moves in the release direction can be provided on the slide door in a manner that is spring-biased in the closing direction of the slide door.

In this case, it is preferable that the release member has a contact portion with the door operating member facing a part of a contact surface of the door operating member in the opening operation portion of the slide door. Further, it is preferable that the lock member is provided on the slide door so as to be movable in a direction substantially perpendicular to the opening and closing direction of the slide door.

Further, according to the fourth invention of the present application, a single reel on which a magnetic tape is wound is rotatably accommodated in a cartridge case, and an opening for pulling out the magnetic tape into the cartridge case; A magnetic tape cartridge provided with a slide door that opens and closes a unit, wherein the slide door is an opening operation unit that moves the slide door in an opening direction by abutting a door operating member of the recording / reproducing device; A bending portion provided with a convex lock portion that engages from the inside of the case into an engagement hole formed of a through hole formed in a wall portion of the case and locks the slide door in a closed state; The unlocking operation member inserted from the outside of the case deforms the bending portion via the convex lock portion, and moves the convex lock portion to the unlock position. And it is characterized in Rukoto. In this case, it is preferable that the engagement hole is formed in an upper wall or a lower wall of the cartridge case, and the bending portion can be bent in a direction substantially orthogonal to the opening and closing direction of the slide door.

[0035]

According to the first aspect of the present invention, the introduction surface of the latch spring is simply pushed by the leader pin at the contact point with the leader pin regardless of the insertion position of the leader pin into the case. Since the latch spring is provided with an inclination angle by which the latch spring is deflected to the side, even if there is variation in the insertion path of the leader pin with respect to the case, there is also variation in the position on the introduction surface of the latch spring. However, the leader pin can be stored at a predetermined position in the case without any trouble.

According to the second aspect of the present invention, at least one bent portion is provided between the leader pin holding portion at the tip and the mounting portion for fixing and holding the latch spring to the fixed portion of the case. Is supported by the fulcrum member so that the arm portion is elastically deformed, and the distance S between the fulcrum member and the fixing portion is provided to be equal to or more than ３ of the distance L between the fulcrum member and the leader pin holding portion. The mounting position accuracy is improved and the amount of protrusion of the leader pin holding part at the tip from the storage part is constant, the locking force on the leader pin by this leader pin holding part is stable, and the leader pin can be securely attached to and detached from the storage part. ,
The reliability of the loading operation can be ensured.

According to the third and fourth aspects of the present invention, by providing the slide structure for opening and closing the opening for pulling out the magnetic tape with the lock structure for locking the closed state,
When the cartridge is not in use, such as during storage and transport, the slide door is kept closed even if a drop impact is applied, preventing foreign substances from entering the inside and improving reliability. it can.

In particular, the engagement between the lock portion and the engagement portion is
In the case where the door operating member is configured to be released as the door operating member comes into contact with the opening operation portion at the leading end of the sliding door, there is an advantage that it is not necessary to separately provide a lock release exclusive member.

[0039]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 1 is a perspective view showing an example of the configuration of a magnetic tape cartridge to which the present invention is applied. The magnetic tape cartridge 1 includes a substantially rectangular flat cartridge case 4 in which an upper half 2 and a lower half 3 are fastened with screws or the like, and a single magnetic tape 6 wound around the cartridge case 4. Reel 7 is rotatably accommodated,
At the end of the magnetic tape 6, a loading leader pin 5 is fixed. A substantially rectangular opening 8 for drawing out the magnetic tape 6 is formed in one side wall (right side wall) of the cartridge case 4 (upper and lower halves 2 and 3). The opening 8 is formed by a door spring 12 described later. The upper and lower halves 2 and 3 near the opening 8 are opened and closed by a sliding door 20 urged in the closing direction, and a recess 9 for accommodating the leader pin 5 is formed.

Further, the magnetic tape cartridge 1 includes:
When the magnetic tape 6 is completely wound around the reel 7 when not in use, the leader pin 5 at the end is locked and held in the recess 9 for storage. A guide surface 10 formed in an inviting structure toward the opening 8 is continuously provided in the recess 9.
The flange 5 c of the leader pin 5 is guided toward the recess 9. In addition, in order to detachably hold the leader pin 5 in the recess 9, for example, a latch spring 30 as shown in FIG. 26 is attached near the recess 9.

The loading direction of the magnetic tape cartridge 1 into the recording / reproducing apparatus is obliquely upper right in FIG.
The front-back direction in this specification is described corresponding to the loading direction.

FIG. 2 shows an embodiment of the magnetic tape cartridge according to the first invention of the present application. When the leader pin 5 is inserted into the case 4, the latch spring 3
FIG. 27 is an explanatory view corresponding to FIG. 26 and showing a state when the leading end of the No. 0 abuts on an introduction surface 31.

When the leader pin 5 is inserted into the case 4, the leader pin storage recess 9 includes inclined linear guide walls 9 a and 9 b for guiding the flange 5 c of the leader pin 5 to the depth of the recess 9, and the flange 9. A semi-circular holding wall 9c having a diameter slightly larger than the radius of 5c is provided.

The center axis S of the leader pin 5 passes through the center of curvature P of the semicircular holding wall 9c at the back of the recess 9 and extends along a center line L1 perpendicular to the side surface of the case 4 on the opening 8 side. It is basically designed to be inserted into the recess 9.

The latch spring 30 has its elastic arm 3
The holding portion 30d of the leader pin 5 is provided at the tip of Ob. The holding portion 30d protrudes in a chevron shape, and a leader pin introduction surface 31 that forms an inclined surface is formed on the tip side of the holding portion 30d. The introduction surface 31 is inclined by an angle α with respect to a straight line L2 parallel to the center line L1, and the inclination angle α is set within a range of 30 ° ± 5 °. And
Assuming that the angle between the guide wall 9a of the recess 9 on the latch spring 30 side and the straight line L2 is about 10 °, the angle β between the guide wall 9a of the recess 9 on the latch spring 30 side and the introduction surface 31 is 20 ° ± 5 °. °.

As described above, in the present embodiment, the inclination angle α of the introduction surface 31 of the latch spring 30 is 30 °.
When the angle is set within the range of ± 5 °, the insertion path of the leader pin 5 into the cartridge case 4 varies, and as shown in FIG. Even if the leader pin 5 is displaced and inserted to the extent that it touches the guide wall 9a on the side of 30 and the position of the introduction surface 31 of the latch spring 30 varies, the leader pin 5 is introduced by the flange 5c abutting on the introduction surface 31. The surface 31 is pushed to cause the arm portion 30b of the latch spring 30 to be deflected to the side, whereby the flange 5c reaches the holding portion 30d of the latch spring 30 as shown in FIG.
As shown in FIG. 4, the holding portion 30d of the latch spring 30 moves the flange 5c into the recess 9 as shown in FIG.
Is elastically pressed and held by the holding wall surface 9c.

The range of the inclination angle α of 30 ° ± 5 ° is as follows.
This value is determined by a number of experiments performed by the inventors of the present invention. If the value deviates from this range to a larger value, the latch spring will not be smoothly displaced only by the insertion operation of the leader pin 5 and the smaller Leader pin 5
The receiving angle of the introduction surface 31 of the latch spring 30 with respect to the
Will hinder the insertion of

In FIGS. 2 to 4, the introduction surface 31 of the latch spring 30 is shown as a straight plane, but the introduction surface 31 may be an arcuate surface or a curved surface. It is sufficient that the inclination angle of the introduction surface 31 at the contact point between the leader pin 5 and the flange 5c is within the range of 30 ° ± 5 °. That is, no matter where the flange 5c contacts the introduction surface 31, the introduction surface 3
1 is within the above range, the latch spring 3 is only pushed by the leader pin 5 irrespective of the insertion position of the leader pin 5 into the case 4.
The zero arm 30b is biased laterally to allow the leader pin 5 to be inserted into the case 4.

FIGS. 5 to 11 show an embodiment of a magnetic tape cartridge according to the second invention of the present application. FIG. 5 is a front view showing the vicinity of an opening with a sliding door opened.
FIG. 6 is a plan view showing the vicinity of the opening with the upper half of FIG. 5 removed, and FIGS. 7A and 7B are cross-sectional views showing the form before and after the thermal fusion of the fixing portion of FIG.

As shown in FIG. 5, the leader pin 5 has a shaft-shaped tape clamp portion 5a which is wound around the tip of the magnetic tape 6 and is clamped by fitting a clamp member 5e having a C-shaped cross section at the center thereof. Thin plate-like flanges 5d, 5d are continuously provided on the upper and lower sides of the tape clamp portion 5a, and a thin shaft portion engaged and held by a robot arm on the recording / reproducing apparatus side is provided outside the flanges 5d, 5d in the axial direction. 5
Column-shaped flanges 5c, 5c are formed with d, 5d therebetween. The leader pin 5 is formed, for example, by cutting a metal bar (such as stainless steel). The length of the tape clamp portion 5 a corresponds to the width of the magnetic tape 6. The clamp member 5e is a resin molded product, has an axial length corresponding to the length of the tape clamp portion 5a of the leader pin 5, and has a C-shaped cross section in which a slit extending in the axial direction is opened over the entire length. The magnetic tape 6 is configured to be elastically fitted to the outer periphery of the tape clamp portion 5a from the side to clamp the magnetic tape 6.

A latch spring 50 for detachably engaging and holding the leader pin 5 is attached to the side opposite to the front side of the upper and lower halves 2 and 3 with respect to the leader pin 5.
On the inner surface of the top wall of the upper half 2 and on the inner surface of the bottom wall of the lower half 3, a concave portion 25 for attaching the latch spring 50 is formed.

The latch spring 5 in the present embodiment
0 is substantially U-shaped (hairpin shape) as shown in FIG.
A leader pin holding portion 50a formed separately from the upper and lower portions by a wire spring and abutting against the outer peripheral surface of the flange 5c of the leader pin 5.
The arm portion 50b extends from the leader pin holding portion 50a in a direction opposite to the opening 8 and is bent approximately 180 ° in an arc shape at the bent portion 50c. It has a linear mounting portion 50d extending in the direction. The leader pin holding portion 50a is provided in a chevron shape protruding toward the leader pin 5, and the elastic arm portion 50b is bent and deformed by contacting the leader pin 5 which is inserted and moved from the opening 8 on the slope on the tip side. The leader pin 5 is pressed and held in the recessed portion 9 for storage on the inclined surface.

The bent portion 50c is engaged and supported by the boss-shaped fulcrum member 40 and is accommodated in the concave portion 25, and the end portion of the mounting portion 50d is a heat-fusion fixing portion 41. Fixed by As shown in FIG. 7 (A), the fixing portion 41 has protrusions 41a, 41a standing on both sides of the inserted mounting portion 50d before heat fusion, and the tips of these protrusions 41a, 41a are heated. As shown in FIG. 7 (B), the protrusions 41a, 41a on both sides are melted and integrated, so that the mounting portion 50d is wrapped inside and caulked.

In such an attached state of the latch spring 50, the bent portion 50c is supported by the fulcrum member 40, and the arm portion 50b between the leader pin holding portion 50a and the bent portion 50c is elastically deformed. Yes, the fulcrum member 4
The distance S between 0 and the fixing portion 41 is set to be not less than の of the distance L between the fulcrum member 40 and the leader pin holding portion 50a, that is, S ≧ (１ ／) L.

The latch spring 50 may be constituted by a wire spring having an elliptical cross section or a rectangular cross section in addition to a circular spring.

According to the present embodiment, the latch spring 50 has the leader pin holding portion 50a at the tip and the mounting portion 50d.
A bent portion 50c is provided between the support member 40 and the fulcrum member 40 to support the arm portion 50b so that the arm portion 50b can be elastically deformed. This basically reduces the influence of the fixing accuracy of the fixing portion 41 on the positional accuracy of the leader pin holding portion 50a. Moreover, the fulcrum member 40 and the fixing portion 41
Distance S between the fulcrum member 40 and the leader pin holding portion 50a
Is set to be as long as 1/3 or more of the distance L from the storage recess 9 of the leading pin holding portion 50a.
Can be made constant, the locking force with respect to the leader pin 5 can be stabilized, and the leader pin 5 can be reliably attached and detached.

FIG. 8 is a plan view of a main part of the modified example of FIG. 6 with the upper half removed, and FIGS. 9A and 9B are cross-sectional views of the fixing portion before and after thermal fusion.

The basic structure of the upper and lower halves 2 and 3 and the leader pin 5 in FIG.
Is similar to the structure shown in FIG. 6, but the configuration of the heat-sealing fixing portion 42 is different.

That is, as shown in FIG. 9A, the fixing portion 42 has a projection 42a close to the side wall surface of the concave portion 25 before the thermal fusion, and a gap between the projection 42a and the side wall surface. When the mounting portion 50d is inserted into the mounting portion 50d, the distal end portion of the projection 42a is heated and melted toward the side wall surface side, and as shown in FIG. 9B, the projection 42a wraps around the mounting portion 50d. It becomes a crimped state.

Also in this case, when the latch spring 50 is mounted, the distance S between the fulcrum member 40 and the fixing portion 42 is equal to or more than １ ／ of the distance L between the fulcrum member 40 and the leader pin holding portion 50a. That is, S ≧ (１ ／) L is set. Since other structures are the same as those in FIG. 6, the same members are denoted by the same reference numerals and description thereof will be omitted.

FIG. 10 is a plan view of an essential part of a magnetic tape cartridge provided with a latch spring 51 having a further different shape, with the upper half removed.

In this embodiment, the latch spring 51 composed of a wire spring is formed to be bent in the shape of a crank, and has a leader pin holding portion 51a which abuts on the flange 5c of the leader pin 5 at its tip.
And an arm 51b extending in a direction opposite to the opening 8 is provided. The arm 51b is bent at the bent portion 51c and further bent to the opposite side to extend in a direction substantially parallel to the arm 31b in the direction opposite to the opening 8. A portion 51d is formed.

The bent portion 51c on the base end side of the arm portion 51b is engaged with and supported by the boss-like fulcrum member 40 of the concave portion 25, and the end portion of the mounting portion 51d is formed in the concave portion 25d.
Is fitted and clamped (press-fitted) between the boss-shaped fixing portion 43 provided close to the wall surface and the wall surface.

When the latch spring 51 is mounted, the bent portion 51c is supported by the fulcrum member 40, and the arm portion 51b between the leader pin holding portion 51a and the bent portion 51c can be elastically deformed. Yes, the fulcrum member 40
The distance S between the fulcrum member 40 and the fixing portion 43 is equal to or more than １ ／ of the distance L between the fulcrum member 40 and the leader pin holding portion 31a, ie,
S ≧ (１ ／) L is set.

FIG. 11 is a plan view of a main part of a magnetic tape cartridge provided with a latch spring 52 having a further different shape, with the upper half removed.

In this embodiment, the latch spring 52 made of a wire spring is formed to be bent substantially in an L shape, and has a leader pin holding portion 52a at the tip which comes into contact with the flange 5c of the leader pin 5, and the leader pin holding portion 52a is provided. An arm 52b extending in the direction opposite to the opening 8 from the opening 52a is provided. The arm 52b is bent by approximately 90 ° at the bent portion 52c to form a linear mounting portion 52d extending in the direction of the back of the concave portion 9.

The bent portion 52c on the base end side of the arm portion 52b is engaged with and supported by the boss-like fulcrum member 40 of the concave portion 25, and the end portion of the mounting portion 52d is connected to the end portion of FIG. 7 and a fixing portion 41 of a heat fusion type similar to FIG.

When the latch spring 52 is mounted, the bent portion 52c is supported by the fulcrum member 40, and the arm 52 between the leader pin holding portion 52a and the bent portion 52c is provided.
b can be elastically deformed, and the distance S between the fulcrum member 40 and the fixing portion 41 is at least ３ of the distance L between the fulcrum member 40 and the leader pin holding portion 32a, that is, S ≧
(1/3) L is set.

In each of the above embodiments, the latch springs 50 to 52 are arranged such that the leader pin holding portions 50a to 52a are separated from the side walls of the upper and lower halves 2 and 3 from the front side (upper side in the figure). Although it is disposed so as to protrude into the concave portion 9, a latch spring may be disposed on the front side opposite to this. In this case, the latch spring is formed separately from the upper and lower parts by a wire spring or the like. The bent part is supported by the fulcrum member, the mounting part is fixed by the fixing part, and the fulcrum is used as described above. The distance S between the member and the fixing portion is set to be equal to or more than １ ／ of the distance L between the fulcrum member and the leader pin holding portion.

FIGS. 12 to 14 are views showing an embodiment of a magnetic tape cartridge according to the third invention of the present application. FIG. 12 is a perspective view showing the vicinity of an opening with a sliding door closed, and FIG. FIG. 14 is a sectional front view of the sliding door portion in the locked state, and FIG. 14 is a sectional front view of the sliding door portion in the unlocked state.

As shown in FIG. 1, the magnetic tape cartridge 1 has a flat rectangular cartridge case 4 in which an upper half 2 and a lower half 3 are fastened by screws or the like. A single reel 7 wrapped with a magnetic tape 6 to which the leader pin 5 is fixed is rotatably accommodated. A substantially rectangular opening 8 for drawing out the magnetic tape 6 is formed in one side wall (right side wall) of the cartridge case 4 (upper and lower halves 2 and 3), and the opening 8 is formed by a door spring 12 (FIG. 13). (See FIG. 13), a groove-shaped door rail 11 (see FIG. 13) is formed near the opening 8 in which the slide door 20 slides.

When the magnetic tape cartridge 1 is not used, when the magnetic tape 6 is completely wound on the reel 7, the leader pin 5 at the end is engaged with the concave portion 9 formed near the opening 8. Will be retained. The recess 9 has a guide surface 10 formed in a guiding structure toward the opening 8.
, And guides the end of the leader pin 5 toward the storage section 9 at the back. A latch spring as described above for detachably holding the leader pin 5 in the recess 9 is attached near the recess 9.

The sliding door 20 for opening and closing the opening 8
Has a substantially rectangular shape, and its upper and lower edges slide open and close along door rails 11 provided on the upper and lower halves 2 and 3. At the front end of the slide door 20, an opening operation portion 21 is provided at a central portion excluding the upper and lower edges to protrude outward.
The opening edge of the front end of the opening 8 of the cartridge case 4 is notched at a portion corresponding to the width of the opening operation portion 21 of the slide door 20, and as shown in FIG. The open operation portion 21 of the slide door 20 in the closed state is inserted, and the slide door 2 is inserted into upper and lower edges of the notch 4a.
The front end edge of the opening operation portion 21 is exposed on the front side of the case. When the magnetic tape cartridge 1 is inserted and loaded into the recording / reproducing apparatus, the door operating member 18 (see FIG. 14) of the recording / reproducing apparatus comes into contact with the front end face 21 a of the opening operation section 21. Ride door 2 against urging force
It is configured such that an opening operation of 0 is performed.

As shown in FIGS. 13 and 14, a lock portion 22 protruding downward is formed on the lower surface of the front end portion of the slide door 20, and this lock portion 22 is formed on the bottom surface of the door rail 11 of the lower half 3. The slide door 20 is locked in the closed position by engaging with the concave engagement portion 13 formed in the slide door 20. Further, the front end surface 21a of the opening operation portion 21 at the tip of the slide door 20, that is, the contact surface with the door operating member 18 has an upper portion forward by a predetermined angle a (e.g. .3 degrees)
It is formed on an inclined surface that is only inclined. That is, the front end face 21a is connected to the door operating member 18 as shown in FIG.
In the contact state with the sliding door 2, the component force of the inclined front end face 21 a with respect to the pressing force A acts upward.
Reference numeral 0 moves the door operating member 18 so as to slide upward in the upward direction in which the engagement between the lower lock portion 22 and the engagement portion 13 is released.

A rearwardly extending rod 23 is connected to the rear end of the slide door 20, and a door spring 12 composed of a coil spring is contracted around the outer periphery of the rod 23 to attach the slide door 20 in the closing direction. I'm going.
The amount of protrusion of the lock portion 22 is formed smaller than the gap between the upper and lower ends of the slide door 20 in the upper and lower door rails 11, and the lock is released by the amount of vertical movement of the slide door 20 in the door rail 11. It has become. In this case, the urging direction of the door spring 12 is set such that the front end of the slide door 20 receives a downward urging force when the slide door 20 is closed as shown in FIG. The engagement with the joint 13 may be enhanced. Further, the lock portion 22 may be formed in a concave shape, and the engaging portion 13 may be formed in a convex shape.

According to this embodiment, in the non-use state such as during storage, the slide door 20 is urged toward the closed position by the door spring 12 as shown in FIG. In the closed position, the lock portion 22 at the lower front end
Engages with the engaging portion 13 and locks the slide door 20 so as not to be opened by a drop impact or the like. When the magnetic tape cartridge 1 is used, as the magnetic tape cartridge 1 is loaded into a recording / reproducing apparatus,
As shown in FIG. 4, the door operating member 18 abuts on the front end face 21a of the opening operation section 21, and presses the sliding door 20 in the opening direction. In accordance with the pressing force A, the front end surface 21a of the opening operation unit 21 inclined at a predetermined angle a moves upward so as to slide up the door operating member 18, and the lower locking unit 22 and the engaging unit 13 Is released, and the slide door 20 can be opened. Thus, in the present embodiment,
The unlocked state is released by using the opening operation force of the door operation member 18, so that it is unnecessary to separately provide a lock release exclusive member.

FIGS. 15 to 17 show a door lock structure according to another embodiment. FIG. 15 is a sectional plan view of a door tip portion in a locked state, FIG. 16 is a plan view of the same in an unlocked state, and FIGS. FIG. 3 is a perspective view of a door tip.

The slide door 60 in the present embodiment is
The front end portion has an opening portion 61 with which the door operating member 18 abuts, and a locking portion 32 protruding rearward is formed on the inner surface of the opening portion 31, and the locking portion 32 is used to cut the cartridge case 4. The slide door 60 is configured to be locked in the closed position by engaging with the concave engagement portion 14 formed on the end face of the notch 4a. Further, as shown in FIG. 17, the open operation portion 61 of the slide door 60 is provided with cut grooves 63 formed at the top and bottom of the base to reduce rigidity so as to be elastically deformable. The front end is inclined so that the tip end opposite to the lock portion 62 projects forward. Thereby, when the opening operation part 61 receives the opening operation force A by the door operating member 18, the opening operation part 61 is turned outward as shown in FIG. Is disengaged in the direction in which the engagement is released.

According to the present embodiment, in the non-use state such as during storage shown in FIG. 15, when the slide door 60 is in the closed state in which the opening 8 is completely closed, the lock section 3 of the open operation section 31 is closed.
2 is locked so as not to engage with the engaging portion 14 to be opened by a drop impact or the like. And the sliding door 60
When the door operating member 18 abuts on the front end of the opening operation portion 61 of the sliding door 60 as shown in FIG. 16 in order to open the door, the opening operation portion 61 is deformed outward in response to the pressing force A. Then, the lock between the lock portion 62 and the engagement portion 14 is released, and the slide door 50 can be opened. Also in the present embodiment, the locked state is released by using the opening operation force of the door operation member 18, and a structure in which a separate exclusive lock release member is not required is provided.

18 to 20 show a door lock structure according to still another embodiment. FIG. 18 is a sectional rear view of a door portion in a locked state, FIG. 19 is a rear view of the same in an unlocked state, and FIG. (A) and (B) are a side view and a bottom view of the tip portion of the slide door.

The lock mechanism is incorporated in the inside of the rear side of the slide door 70 in this embodiment. A door operating member 1 is provided at the front end of the sliding door 70.
8 is provided with an opening operation section 71 with which the opening operation section 7 contacts.
A recess 70a extending in the door opening / closing direction D with a predetermined width from 1 is formed, and a sliding groove 70b extending in a direction orthogonal to the door opening / closing direction D intersects the recess 70a. A rod-shaped lock member 72 having an engagement groove 72b inclined with respect to the opening / closing direction D of the slide door 70 is slidably inserted into the groove 70b.

Further, a release member 73 is slidably inserted into the recess 70a. The release member 73 has a pressing portion 73a whose front end is exposed on the front end surface of the opening operation portion 71 of the slide door 70, and an inclined portion 73c is connected between the release member 73 and a sliding base 73b at the rear. Are engaged with the inclined engagement groove 72b of the lock member 72, and the release member 7
The lock portion 72a is linked so as to protrude and retract from the lower end of the slide door 70 in accordance with the sliding of the slide door 3.

A biasing spring 74 is compressed at the rear of the release member 73 to bias the release member 73 forward. The lower end of the lock member 72 has a protruding lock portion 72a.
The lock portion 72a is protruded and retracted from the lower end of the slide door 70, and is protruded from the door rail 1 of the lower half 3.
The sliding door 70 is engaged with the concave engaging portion 15 on the bottom surface of the sliding door 70.
Is locked in the closed position, and when the lock member 72 moves upward, the engagement is released and the lock is released.

The engagement between the recess 70a and the release member 73 is formed in a dovetail structure as shown in FIG. 10A.
A release member 73 assembled with the lock member 72 is mounted from a notch 70c formed in a part of the recess 70a,
Thereafter, the urging spring 74 is assembled. On the other hand, a projection 18a is provided at the tip of the door operating member 18 to form a step. The projection 18a first comes into contact with the front end of the pressing portion 73a of the release member 73, and the release member 73 Is moved backward, whereby the lock member 72 is slid upward by the cam action of the inclined portion 73c of the release member 73, and the lock is released.

According to the present embodiment, in the non-use state such as during storage shown in FIG. 18, when the slide door 70 is in the closed position where the opening 8 is completely closed, the release member 73 is
4, the front end lock portion 72a of the lock member 72 is projected from the lower end of the slide door 70 to engage with the engagement portion 15, and the slide door 7 is moved by a drop impact or the like.
0 is locked so as not to open. As shown in FIG. 19, when the projection 18a of the door operating member 18 comes into contact with the front end surface of the pressing portion 73a of the release member 73, the release member 7 is released.
3, the locking member 7 is actuated by the action of the inclined portion 73c.
2 moves upward, the lock between the lock portion 72a and the engagement portion 15 is released, and the slide door 70 can be opened. When the door operating member 18 subsequently contacts the open operation portion 71, the slide door 70 is opened. Activated. Also in the present embodiment, the locked state is released by using the opening operation force of the door operation member 18, so that a separate lock release exclusive member is not required.

FIGS. 21 and 22 show an embodiment of a magnetic tape cartridge according to the fourth invention of the present application. FIG. 21 is a sectional front view of a door portion in a locked state, and FIGS. (B) is a sectional view of a principal part in a locked state and a released state of a lock portion.

The sliding door 80 in the present embodiment is
At the front end, a door operating member 18 of the recording / reproducing apparatus side comes into contact with an opening operation portion 81 for moving the sliding door 80 in the opening direction, and a convex lock portion 82 projecting downward is provided at a lower portion. The lock part 82 is the door rail 11 of the lower half 3
The slide door 80 is configured to engage with the concave engagement portion 16 formed of a through hole on the bottom surface and lock the slide door 80 in the closed position.
An opening 8 is provided above the lock portion 82 of the slide door 80.
3, whereby the lower edge of the opening 83 is
When the lock portion 82 is pressed from below, it is bent and deformed into the opening 83 to form a thin flexible portion 84 that allows the lock portion 82 to move upward. Further, the engaging portion 16 of the lower half 3 penetrates the case wall surface, and when the lock portion 82 is pushed up by the abutment of the unlocking operation member 19 (see FIG. 22) from the outside, the bending portion 84 is moved into the opening 83. The locking portion 82 is disengaged from the engaging portion 16 to be released from the locked state.

According to the present embodiment, in the non-use state such as during storage shown in FIG. 22 (A), the lock portion 82 of the lower half 3 is in the closed position where the slide door 80 completely closes the opening 8. It is engaged with the engaging portion 16 and locked so as not to be opened by a drop impact or the like. As shown in FIG. 22B, in order to open the slide door 80, when the unlocking operation member 19 is inserted into the engagement portion 16 from the outside of the lower half 3 and the lock portion 82 is pushed up, the lock portion 82 is raised. The bending portion 84 is deformed through the locking portion 82, and the locking portion 82 is disengaged from the engaging portion 16 to be in the unlocked state.
The sliding door 80 is opened by contacting the front end of the slide door 80. In the present embodiment, the door operating member 18
In addition to the above, an unlocking operation member 19 is required on the recording / reproducing apparatus side.

[Brief description of the drawings]

FIG. 1 is a perspective view of a magnetic tape cartridge to which the present invention is applied, in a state where a magnetic tape is pulled out.

FIG. 2 is an explanatory view showing a state in which the flange of the leader pin abuts on the introduction surface of the latch spring when the leader pin is inserted into the cartridge case in the embodiment of the magnetic tape cartridge according to the first invention of the present application;

FIG. 3 is an explanatory view showing a state in which a flange of a leader pin passes through a holding portion of a latch spring in the embodiment of FIG. 2;

FIG. 4 is an explanatory view showing a state in which a flange of a leader pin is held in a depth of a concave portion of a cartridge case in the embodiment of FIG. 2;

FIG. 5 is a front view of the vicinity of the opening with the sliding door open in the embodiment of the magnetic tape cartridge according to the second invention of the present application;

FIG. 6 is a plan view showing the vicinity of an opening with the upper half of FIG. 5 removed;

FIG. 7 is a cross-sectional view showing a form before and after thermal fusion of a fixing portion in FIG. 6;

FIG. 8 is a plan view of a main part of the magnetic tape cartridge according to another embodiment with an upper half removed.

FIG. 9 is a cross-sectional view of the fixing portion of FIG. 8 before and after thermal fusion.

FIG. 10 is a plan view of an essential part in a state where an upper half of a magnetic tape cartridge provided with a latch spring of another embodiment having a different shape is removed;

FIG. 11 is an essential part plan view showing a state where an upper half of a magnetic tape cartridge provided with a latch spring according to another embodiment having a different shape is removed from the upper half;

FIG. 12 is a perspective view of the vicinity of the opening with the sliding door closed in the embodiment of the magnetic tape cartridge according to the third invention of the present application;

FIG. 13 is a sectional front view of the vicinity of an opening in a locked state of the slide door.

14 is a sectional front view of the vicinity of the opening in the unlocked state in FIG. 13;

FIG. 15 is a cross-sectional plan view of the vicinity of an opening in a locked state of a slide door according to another embodiment.

FIG. 16 is a plan view of the same section in the released state of FIG. 15;

FIG. 17 is a perspective view of the tip of the sliding door of FIG. 15;

FIG. 18 is a cross-sectional rear view of the vicinity of an opening in a locked state of a slide door according to still another embodiment.

19 is a rear view of the same section in a released state of FIG. 18;

20 is a side view and a bottom view of the sliding door of FIG.

FIG. 21 is a sectional front view of the vicinity of the opening in the locked state of the slide door in the magnetic tape cartridge according to the fourth invention of the present application.

FIG. 22 is a sectional view of a main part of the sliding door in FIG. 21 in a locked state and a released state.

FIG. 23 is a longitudinal sectional view of a main part showing a structure of a leader pin holding part in a conventional magnetic tape cartridge.

FIG. 24 is a plan view showing a part of the cross section.

FIG. 25 is a perspective view of the latch spring.

FIG. 26 is an explanatory view corresponding to FIG. 2, showing a state in which the flange of the leader pin abuts the introduction surface of the latch spring when the leader pin is inserted into the cartridge case in the conventional magnetic tape cartridge.

FIG. 27 is a plan view showing the vicinity of an opening in a state where an upper half of a conventional magnetic tape cartridge is removed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic tape cartridge 2 Upper half 3 Lower half 4 Cartridge case 5 Leader pin 6 Magnetic tape 7 Reel 8 Opening 9 Leader pin storage recess 11 Door rail 12 Door spring 16 Engaging part 18 Door operating member 20,60,70,80 Sliding doors 21, 61, 71, 81 Door opening operation part 22, 32, 72a, 82 Lock part 30, 50, 51, 52 Latch spring 72 Lock member 73 Release member 84 Flexure part

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Daisuke Takahashi 2-12-1, Ogimachi, Odawara City, Kanagawa Prefecture Inside Fuji Photo Film Co., Ltd. (72) Inventor Seiji Tsukigi 2-12-1, Ogimachi, Odawara City, Kanagawa Prefecture Fuji Photo Film Co., Ltd.

Claims (4)

[Claims] 1. A single reel on which a magnetic tape is wound is rotatably housed in a cartridge case, and a tape pull-out leader pin fixed to a leading end of the magnetic tape is provided on the case with respect to both ends thereof. The case is detachably held in the case by a biasing force applied from the side by a latch spring provided in the case, and the latch spring is laterally moved by the leader pin when the leader pin is inserted into the case. A magnetic tape cartridge comprising: an introduction surface that is deflected to allow insertion of the leader pin into the case; and a holding portion that holds the leader pin passing through the introduction surface in the case. The angle of inclination of the introduction surface at the contact point with the leader pin with respect to the insertion direction of the leader pin, Magnetic tape cartridge, wherein the latch spring is set to an angle induced to offset laterally by only the operation is pushed by irrespective the leader pin insertion position in the emissions of the inner case. 2. A single reel on which a magnetic tape is wound is rotatably accommodated in a cartridge case, and a leader pin for pulling out a tape fixed to a leading end of the magnetic tape is attached to the case with respect to both ends thereof. A magnetic tape cartridge removably held in the case by a biasing force applied from the side by a latch spring provided in the case, wherein the latch spring has a leader pin holding portion at a leading end contacting the leader pin. An arm portion between the leader pin holding portion and the bent portion, wherein at least one bent portion is provided between the fixed portion fixed to the cartridge case and the bent portion is supported by a fulcrum member; When the distance between the fulcrum member and the leader pin holding portion is L, the fulcrum member and the fixed member are fixed. The distance between the S is, S
A magnetic tape cartridge set to satisfy a relationship of ≧ (１ ／) L. 3. A single reel on which a magnetic tape is wound is rotatably housed in a cartridge case, and an opening for pulling out the magnetic tape in the cartridge case, and a slide door for opening and closing the opening. In the magnetic tape cartridge provided with, the sliding door is associated with an opening operating portion that contacts a door operating member on the recording / reproducing device side to move the sliding door in an opening direction, and an engaging portion of the cartridge case. A lock portion that locks the slide door in the closed position and releases the engagement with the engagement portion in conjunction with the contact of the door operating member with the open operation portion. Characterized magnetic tape cartridge. 4. A single reel on which a magnetic tape is wound is rotatably accommodated in a cartridge case, and an opening for pulling out the magnetic tape in the cartridge case, and a slide door for opening and closing the opening. Wherein the slide door is formed on an opening operation portion that abuts a door operating member on the recording / reproducing apparatus side to move the slide door in an opening direction, and is formed on a wall portion of the cartridge case. A flexible portion provided with a convex lock portion that engages from the inside of the case into an engagement hole formed of a through hole and locks the slide door in a closed state, and is inserted into the engagement hole from outside the case. A magnetic tape, wherein a lock release operation member deforms the bending portion via the convex lock portion to move the convex lock portion to a lock release position. Cartridges.