JP2002260362A - Magnetic tape cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic tape cartridge in which the holding part of a leader pin and the vicinity of a tape outlet are not deformed even if external force such as an impact by a fall or the like is added during handling, or operation is possible without adversely affecting the operation of the magnetic tape cartridge in a recording and reproducing apparatus even if they are deformed, and the offset of a magnetic recording tape is relieved while it is not used. SOLUTION: The magnetic tape cartridge has a recessed part for stacking cases on the upper surface of an upper half, and a projected part for stacking cases on the undersurface of a lower half. A pin upper end holding part is an upper end holding recessed part formed inside an upper half inside surface, and a pin lower end holding part is a lower end holding recessed part formed inside a lower half inside surface. The undersurface of the lower half in the lower end holding recessed part is bulged downward. The protruding height T1 of a bulging part from the lower half undersurface and the protruding height of the projected part for stacking, and the depth h1 of the upper end holding recessed part and the depth h2 of the lower end holding recessed part have the relation of a formula (1): T1 <T2 and a formula (2): h1 <h2 .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a magnetic tape cartridge.

[0002]

2. Description of the Related Art As a large-capacity recording medium for data backup in an external storage device such as a computer, a single tape reel around which a magnetic recording tape is wound is freely rotatable in a case housing composed of an upper half and a lower half. There is known a magnetic tape cartridge of a type accommodated in a magnetic tape cartridge. For example,
FIG. 2 is an exploded perspective view of the one-reel type magnetic tape cartridge. The upper half 131 and the lower half 132 are combined to form screws 133a, 133b, 133c, and 1.
A tape reel 135 around which the magnetic recording tape 134 is wound is rotatably housed in a case housing which is fastened and fixed by 33d.

The tape reel 135 has a disk-shaped upper flange 136 and a lower flange 137, is integrally mounted on the upper flange 136, and has a magnetic recording tape 13 around its outer periphery.
4 are wound. The tape reel 135 is constantly urged toward the lower half 132 by a coil spring 139 for urging the reel mounted on the rotation support shaft member 138.

A circular opening 153 is formed in the center of the bottom of the lower half 132. A rotary shaft is inserted into the opening 153 from the recording / reproducing apparatus (deck) side when a magnetic tape cartridge is used. Is connected to a lower end portion (not shown) of the hub 137 which is fitted into the fitting hole 154 opened in the lower portion (not shown), and is pushed up, so that the tape reel 134 is positioned at the upper and lower central positions of the cassette housing. Is done.

[0005] The lower half 132 has a tape outlet 1 for pulling out the magnetic recording tape from the inside of the cassette body to the outside.
An opening / closing door for opening / closing 40 is attached. further,
At the end of the magnetic recording tape 134, a leader pin 144 for pulling out the magnetic recording tape from the magnetic tape cartridge loaded in the recording / reproducing device is mounted.

On the upper surface of the upper half 131 of the case housing, corresponding to the stacking convex portions 145a, 145b, 145c, 145d provided on the lower surface of the lower half 132, the stacking convex portions 145a and the like are provided. Stacking concave portions 146a, 146b and the like to be fitted are formed.

In such a magnetic tape cartridge, as shown in an enlarged schematic cross-sectional view of FIG. 3, a pin upper end holding groove 147 and a pin lower end holding groove are formed on the inner surfaces of the upper half 131 and the lower half 132 of the tape outlet 140, respectively. 148 are formed, the upper end and the lower end of the leader pin 144 are held in the pin upper end holding groove 147 and the pin lower end holding groove 148, and the leader pin 144 is held in the vertical direction by the tape outlet 140, and is housed in the case housing. Have been.

In this magnetic tape cartridge, the pin upper end holding groove and the pin lower end holding groove are engraved inward from the openings formed as the tape outlets of the upper half and the lower half to form thin portions. . The thin portion is weaker than other portions, and is likely to cause deformation of the vicinity of the outlet when an external force is applied due to, for example, an impact when the magnetic tape cartridge is dropped. If the draw-out opening and its vicinity are significantly deformed, it may be difficult to load the magnetic tape cartridge into the recording / reproducing device, or it may interfere with the operation of pulling out the tape in the recording / reproducing device.

When the magnetic tape cartridge is not used, the leader pin is at a predetermined height in the upper and lower half directions so that the leader pin is at a predetermined position with respect to the tape pull-out mechanism of the recording / reproducing apparatus when the magnetic recording tape is loaded. It is housed and held in the tape outlet. On the other hand, when not in use, the tape reel is driven by a coil spring for urging the reel.
It is urged toward the lower half, and is located below the upper and lower center position of the cassette housing which is pushed up and arranged by the rotating shaft inserted from the recording / reproducing apparatus side when using the magnetic tape cartridge. Therefore, when the magnetic tape cartridge is not used, the position of the magnetic recording tape wound around the tape reel is offset downward in the upper and lower half directions of the case housing with respect to the position of the leader pin. Therefore, an unreasonable force acts on the tape due to an impact applied by dropping or the like, and the tape may be wrinkled or deformed.

[0010]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a recording apparatus which does not deform the vicinity of the leader pin holding portion and the tape outlet even if an external force such as an impact due to a drop is applied, or records even if it deforms. It is an object of the present invention to provide a magnetic tape cartridge which can operate without adversely affecting the operation of the magnetic tape cartridge in the reproducing apparatus, and in which the offset of the magnetic recording tape is reduced when not in use.

[0011]

According to the present invention, a magnetic recording tape is rotatably accommodated in a case housing formed by combining an upper half and a lower half. Has a pin upper end holding portion and a pin lower end holding portion on the inner surface of the upper half and the lower half, respectively.
The upper end and the lower end of the leader pin attached to the leading end of the magnetic recording tape are held by the pin upper end holding portion and the pin lower end holding portion, respectively, and the leader pin is accommodated and held in the tape pull-out opening, and on the upper surface of the upper half. A magnetic tape cartridge having a case stacking concave portion and a case stacking convex portion disposed on the lower surface of the lower half corresponding to the case stacking concave portion, wherein the pin upper end holding portion is formed on the inner side of the upper half inner surface. The pin lower end holding portion is a lower end holding recess formed inside the inner surface of the lower half, and the lower surface of the lower half in the lower end holding recess is bulged downward, projection height of the projecting height of the bulge portion from the lower surface T ₁ and the stacking protrusions T _2, and the depth of the upper holding recess h ₁ and the lower end holding recess depth h ₂ is the following formula (1) and (2 To provide a magnetic tape cartridge is characterized in that to have a relationship. T ₁ <T ₂ (1) h ₁ <h ₂ (2)

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1A is a schematic view of a magnetic tape cartridge of the present invention, taken along the line AA in FIG. And FIG. 1B which is a schematic cross-sectional view showing the side surface thereof. In the following description, the description of the same members and parts as those of the magnetic tape cartridge shown in FIG. 2 will be omitted, and the structure of the portion for housing and holding the leader pin will be mainly described.

A magnetic tape cartridge whose schematic cross-sectional view is shown in FIGS. 1A and 1B is a case housing 3 constructed by combining an upper half 1 and a lower half 2 as shown in FIG. 1C. A magnetic recording tape (not shown) is rotatably accommodated in the case housing 3. As shown in FIG. 1A, on the inner surface 2a of the lower half 2 from the lower edge 6 of the tape outlet 5 opened to one corner 4 of the magnetic tape cartridge toward the inside of the case housing 3, A swelling portion 7 formed by swelling the lower half 2 downwardly forms a pin lower end holding portion for holding the lower end of the leader pin continuously from the lower edge of the tape outlet 5. It is formed as a holding recess 8. The edge of the lower end holding recess 8 of the tape outlet 5 functions as a guide groove at the lower end of the leader pin when the leader pin is housed and held. Also,
As shown in FIG. 1B, the outlet 5 of the lower end holding recess 8 is provided.
Notch tip side, forming an inclined surface C _1, since attained a smooth introduction of the leader pin from a lower end edge of the lower end holding recess 8, it is effective.

On the other hand, on the inner surface 1a of the upper half 1, FIG.
As shown in (A), a pin upper end holding portion for holding the upper end of the leader pin is provided at a position facing the lower end holding concave portion 8 so as to be continuously cut from the upper edge of the tape outlet 5. 9. The edge of the upper end holding recess 8 of the tape outlet 5 functions as a guide groove at the upper end of the leader pin when the leader pin is housed and held. Also,
As shown in FIG. 1B, the outlet 5 of the upper end holding recess 9 is provided.
Notch tip side, forming an inclined surface C _2, since the attained a smooth introduction of the leader pin from a lower end edge of the upper end holding recess 9, is effective.

In this magnetic tape cartridge, the protruding height T ₁ of the bulging portion 7 from the lower surface of the lower half is determined as shown in FIG.
As shown in (A) and (B), the stacking recesses 10a, 10 provided on the upper surface of the upper half 1 of the case housing.
b, 10c, so as to fit to 10d, formed in correspondence with these stacking recess, stacking projection 11a provided on the lower surface of the lower half 2, 11b, 11c, than the projection height T ₂ of 11d low Is done. Also, as shown in FIG. 1B, the depth h ₁ of the upper holding recess is equal to the depth h of the lower holding recess.
It is formed shallower than ₂ . That is, T ₁ , T ₂ , h ₁
And h ₂ is configured to have a relation of the following (1) and (2). . T ₁ <T ₂ (1) h ₁ <h ₂ (2)

In the magnetic tape cartridge thus configured, since the thin portion is not formed near the lower end holding concave portion of the lower half, even if an external force such as an impact is applied to the magnetic tape cartridge due to a drop or the like, the vicinity of the draw-out opening is reduced. It is difficult to deform, and even if it is deformed, it becomes difficult to load the magnetic tape cartridge into the recording / reproducing device, or it does not interfere with the operation of pulling out the tape in the recording / reproducing device. It can be kept to an extent.

In the pin lower end holding portion 8, the protrusion height T ₁ of the bulging portion 7 from the lower surface of the lower half is set to the lower half 2.
Stacking projections 11a, 11b, 1 provided on the lower surface of
1c, in order to form lower than the projection height T ₂ of the 11d,
When the magnetic tape cartridge is not used, the position of the magnetic recording tape wound on the tape reel is not offset downward with respect to the position of the leader pin,
An excessive force acts on the tape due to an impact applied due to a drop or the like, so that the tape does not wrinkle or deform, and there is no possibility that the drawing or winding operation of the magnetic recording tape is adversely affected.

[0018]

According to the magnetic tape cartridge of the present invention, even if an external force such as an impact due to a drop or the like during handling is applied, the vicinity of the holding portion of the leader pin and the tape outlet is not deformed, or the magnetic tape cartridge records even if deformed. The operation is possible without adversely affecting the operation of the magnetic tape cartridge in the reproducing apparatus. In addition, since the offset of the magnetic recording tape is reduced when not in use, the tape can be smoothly pulled out or wound without an excessive force acting on the tape due to an impact caused by dropping or the like, thereby causing wrinkling or deformation of the tape. This is effective in securing the picking operation.

[Brief description of the drawings]

FIG. 1A is a schematic cross-sectional view showing a structural example of an upper end holding portion and a lower end holding portion of a leader pin of a magnetic tape cartridge of the present invention, FIG. 1B is a schematic cross-sectional view showing a side surface thereof, and FIG. () Is a perspective view showing an example of the magnetic tape cartridge of the present invention.

FIG. 2 is an exploded perspective view illustrating a configuration of a conventional one-reel type magnetic tape cartridge.

FIG. 3 is a schematic cross-sectional view showing a structure for holding and holding a leader pin in a conventional magnetic tape cartridge.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper half 1a Inner surface of upper half 2 Lower half 2a Inner surface of lower half 3 Case housing 4 Side corner surface 5 Tape outlet 6 Lower edge 7 Swelling portion 8 Lower end holding recess 9 Upper end holding recess 10a, 10b, 10c, 10d Stacking recesses 11a, 11b, 11c, 11d Stacking projections

Claims (1)

[Claims] A magnetic recording tape is rotatably accommodated in a case housing constituted by combining an upper half and a lower half, and a pin upper end holding portion and a pin are respectively provided on inner surfaces of an upper half and a lower half of a tape outlet. It has a lower end holding part,
The upper end and the lower end of the leader pin attached to the leading end of the magnetic recording tape are held by the pin upper end holding portion and the pin lower end holding portion, respectively, and the leader pin is accommodated and held in the tape outlet, and A magnetic tape cartridge having a case stacking concave portion, and a case stacking convex portion provided on a lower surface of a lower half corresponding to the case stacking concave portion, wherein the pin upper end holding portion is formed on an inner surface of an upper half inner surface. The pin lower end holding portion is a lower end holding recess formed inside the inner surface of the lower half, and the lower surface of the lower half in the lower end holding recess is swelled downward, The protruding height T ₁ of the bulging portion from the lower surface, the protruding height T ₂ of the stacking convex portion, and the depth h _{1 of the} upper end holding concave portion.
And the depth h ₂ of the lower end holding recess are given by the following equations (1) and (2).
A magnetic tape cartridge characterized by having the following relationship. T ₁ <T ₂ (1) h ₁ <h ₂ (2)