JPH11339435A - Magnetic tape cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the deformation of a cartridge case to attain smooth surface of plane of a label attaching area by providing additional portion at the rear side of a recessed area of the cartridge case. SOLUTION: A cartridge case 1 has a float upper surface 1a and a flat lower surface 1b. An additional, portion 14 is provided in the rear surface side of a recessed area adjacent to a label attaching area 6 of the cartridge case 1 and a reduced portion 15 is also provided in the rear surface of a projected portion 8 adjacent to the label attaching area 6 of the cartridge case label 1. Therefore the smooth surface of plane of the label attaching area 6 can be attained by preventing deformation when the cartridge case 1 is formed. Moreover, falling of the side wall in the side of label attaching area 6 at the time of formation can be prevented and generation of level different area between the upper and lower halves 2, 3 on the surface of label attaching area can be prevented.

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 accommodated in a flat cartridge case having flat upper and lower surfaces. A label sticking area is recessed on one side of the cartridge case, and an uneven portion for preventing displacement when a plurality of magnetic tape cartridges are stacked is close to the label sticking area. The present invention relates to a magnetic tape cartridge formed on upper and lower surfaces.

[0002]

2. Description of the Related Art Conventionally, a magnetic tape cartridge used as a recording medium mainly functioning as a backup of a computer memory includes a single reel on which a magnetic tape is wound, and a substantially square having an upper half and a lower half. Is rotatably accommodated in a flat cartridge case having a flat shape.

When a magnetic tape cartridge having such a configuration is inserted into an external recording / reproducing apparatus, the reel engaging teeth exposed from a circular opening formed at the center of the lower half are provided on the apparatus side. With the rotation drive engaged,
The magnetic tape is pulled out of the cartridge case by the tape pull-out mechanism on the device side and drawn into a predetermined position on the tape running path, so that writing / reading of data to / from the magnetic tape becomes possible.

In this type of magnetic tape cartridge, a label pasting area extending in the upper and lower halves is recessed on a side surface on the rear side with respect to the insertion direction of the cartridge case into the external recording / reproducing apparatus.

[0005]

By the way, in the magnetic tape cartridge having the above-described structure, a plurality of the magnetic tape cartridges can be moved, transported, or conveyed in a stacked state so as to be close to the outer edge of the lower surface of the cartridge case. For example, if a convex portion is provided, and a concave portion is provided at a position corresponding to the convex portion near the outer edge of the upper surface of the cartridge case,
The convex portion engages with the concave portion on the upper surface of the cartridge case of the lower magnetic tape cartridge on which the magnetic tape cartridge is mounted at the time of stacking, thereby preventing displacement when the magnetic tape cartridge is stacked.

However, since the portions of the cartridge case where the irregularities are formed become thicker or thinner, the thicker portion or the thinner portion is formed at a position adjacent to the label attaching area when the cartridge case is molded. Then, warping, sinking, deformation and the like of the molding material occur.
For this reason, sink marks may occur on the label attaching area, or a step may occur between the upper and lower half label attaching areas, which may hinder the writing of the label or read a bar code or the like recorded on the label. There was a disadvantage that it became impossible.

In view of the above circumstances, according to the present invention, a label sticking area is formed on one side surface of a cartridge case, and an uneven portion for preventing displacement during stacking is formed near the label sticking area. It is an object of the present invention to prevent the cartridge case from being deformed in such a case and to make the surface of the label attaching region a smooth flat surface.

[0008]

Means for Solving the Problems The first invention of the present application is:
When a concave portion is formed on the upper surface or lower surface of the cartridge case so as to prevent displacement during stacking of the magnetic tape cartridges adjacent to the label attaching region, a thickened portion is provided on the back side of the concave portion of the cartridge case. It is characterized by having been provided.

The second invention of the present application is directed to a case where a convex portion is formed on an upper surface or a lower surface of a cartridge case so as to prevent a displacement during stacking of magnetic tape cartridges, adjacent to a label attaching region. A thinner portion is provided on the back side of the convex portion of the cartridge case.

According to a third aspect of the present invention, a label affixing area extending over the upper and lower halves of a cartridge case is formed in a recess, and a positional shift during stacking of magnetic tape cartridges is provided on one of an upper surface and a lower surface of the cartridge case. A convex portion for preventing is formed adjacent to the label sticking area, and a concave portion with which the convex portion of the cartridge case adjacent to the upper or lower side when stacked is engaged on the other of the upper surface or the lower surface of the cartridge case. When formed, a thickened portion is provided behind the concave portion of the cartridge case, and a thinned portion is provided behind the convex portion of the cartridge case.

[0011]

According to the present invention, a thickened portion is provided on the back side of the concave portion adjacent to the label attaching region of the cartridge case, and the thinned portion is formed on the back side of the convex portion adjacent to the label attaching region of the cartridge case. By providing the portion, the deformation of the cartridge case at the time of molding can be prevented, and the surface of the label attaching region can be made a smooth flat surface, thereby facilitating writing on the label.

In addition, it is possible to prevent "falling" of the side wall on the side of the label sticking area at the time of molding, and to prevent a step between the upper and lower halves on the surface of the label sticking area.

[0013]

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

FIG. 1 is a perspective view showing an embodiment of a magnetic tape cartridge according to the present invention with its lower surface facing upward, and FIG. 2 is a state in which the upper surface is facing upward, contrary to FIG. 3A and 3B are a schematic plan view and a bottom view, respectively.

In the magnetic tape cartridge, a single reel around which a magnetic tape is wound is rotatably accommodated in a flat, substantially square cartridge case 1 composed of an upper half 2 and a lower half 3 made of plastic. The cartridge case 1 has a flat upper surface 1a and a lower surface 1b. As is apparent from FIG. 2, a tape pull-out opening 4 for pulling out one end of the magnetic tape is formed on one side surface of the cartridge case 1 so as to straddle the upper half 2 and the lower half 3. At the same time, a slide door 5 for opening and closing the tape pull-out opening 4 is slidably provided between a closed position and an open position. This sliding door 5
Is biased toward the closed position by an appropriate spring member (not shown) incorporated in the cartridge case 1 and is held at the closed position. Inside the tape pull-out opening 4, a leader member (not shown) which clamps the tip of the magnetic tape is detachably held.

This magnetic tape cartridge is inserted and mounted on an external recording / reproducing apparatus in the direction of arrow A in FIG. 3B (in FIG. 1, the direction going diagonally lower right, in FIG. 2, in the direction going diagonally upper right). On the side of the cartridge case on the trailing side with respect to the insertion direction, a label sticking area 6 is provided astride between the upper and lower halves 2 and 3. When the magnetic tape cartridge is inserted into the external device, the slide door 5 is opened by a member on the device side in accordance with the insertion, and the leader member is pulled into the device side together with the magnetic tape. Is set on the apparatus side, and the rotary drive unit on the apparatus side engages with the engaging teeth (not shown) of the reel exposed in the circular opening 7 formed in the center of the lower half 3, Data can be written / read to / from a magnetic tape.

In this embodiment, the tape pull-out opening 4 is covered with the slide door 5, but a cover member other than the slide door 5 can be used.

As shown in FIGS. 1 and 3 (b), four projections 8 are provided on the lower surface 1b of the cartridge case 1 to prevent a displacement when a plurality of magnetic tape cartridges are stacked. Are protruded symmetrically with respect to the circular opening 7 and symmetrically back and forth. 2 and 3 on the upper surface 1a of the cartridge case 1.
As shown in (a), a concave portion 9 with which the above-mentioned convex portion 8 of the cartridge case 1 to be placed at the time of stacking is engageable is formed correspondingly.

The projection 8 provided on the lower surface 1b of the cartridge case 1 is shown in FIG. 3B in order to prevent interference when the rotary drive of the external recording / reproducing apparatus accesses the magnetic tape cartridge. As described above, the lines L1 and L2 parallel to the insertion direction passing through the inner edge of the convex portion 8 correspond to the lower half 3
It is preferable that the position is set so as to be outside the circular opening 7 formed at the center of the image.

When a label sticking area 6 is provided on the side of the cartridge case on the trailing side with respect to the insertion direction of the magnetic tape cartridge, the case upper surface 1a near the label sticking area 6 is shown in FIG. When the concave portion 9 as shown is to be formed, the back side of the concave portion 9 becomes the thin portion 10, so that the fluidity of the molding material in that portion is lower than other portions during molding,
The distortion occurs there. Since the case wall on the side of the cartridge case where the label sticking area 6 is provided is thin, a part of the case wall on the label sticking area 6 side falls inward as shown in FIG. As a result, there is a problem that a step 11 is formed on the label attaching area 6.

Further, when it is attempted to form a convex portion 8 as shown in FIG. 4A on the case lower surface 1b near the label sticking area 6, the portion of the convex portion 8 becomes a thick portion 12, so that molding is performed. In some cases, the cooling rate of the molding material on the back side of the convex portion 8 is lower than that of the other portions, and as a result, as shown in FIG. There was a fear.

Therefore, in the present embodiment, as shown in FIG. 5, by providing a thickened portion 14 on the back side of the concave portion 9,
The formation of the thin portion 10 is prevented. The meat portion 14 is
As shown in FIG. 6A, it may be provided over the entire recess 9 or as shown in FIG. 6B, may be provided in a rib shape. From a viewpoint, it is preferable to provide it over the entire concave portion 9.

As shown in FIG. 7, when the thickness of the periphery of the concave portion 9 of the top plate of the upper case 2 is a and the thickness of the case wall of the label attaching region 6 is c, the thickened portion 14 is provided. The thickness b of the portion indicated is 1/2 of the thicker value of the thicknesses a and c.
It is preferable to set the range between 2 times and 3/2 times, and 2/3
It is more preferable that the range is between 2 and 1.

Further, in this embodiment, as shown in FIG. 5, by providing a thinned portion 15 on the back side of the convex portion 9,
The formation of the thick portion 12 is prevented.

As described above, in the present embodiment, the thickened portion 14 is provided on the back side of the concave portion 9 adjacent to the label attaching region 6 of the cartridge case 1, and is provided in the label attaching region 6 of the cartridge case 1. By providing the thinned portion 15 on the back side of the adjacent convex portion 8, the cartridge case 1
Can be prevented from being deformed at the time of molding, and the surface of the label attaching region 6 can be made a smooth flat surface, thereby facilitating writing on the label.

In addition, it is possible to prevent "falling" of the side wall on the label attaching area 6 side during molding, and to prevent a step between the upper and lower halves 2 and 3 on the surface of the label attaching area. it can.

In the above-described embodiment, the cartridge case 1 has a configuration in which the convex portion 8 is formed on the lower surface 1b and the concave portion 9 is formed on the upper surface 1a. The present invention can also be applied to a configuration in which the concave portion 9 is formed in the upper surface 1a of the case 1 and the lower surface 1b of the cartridge case 1.

The present invention is applicable not only to the cartridge case of a magnetic tape cartridge but also to the cartridge case of a magnetic optical disk cartridge.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a magnetic tape cartridge according to the present invention with its lower surface facing up;

FIG. 2 is a perspective view showing the magnetic tape cartridge of FIG. 1 with its upper surface facing up;

FIG. 3 is a schematic plan view and a bottom view of the magnetic tape cartridge shown in FIGS. 1 and 2;

FIG. 4 is a schematic cross-sectional view of a main part of a cartridge case to which the present invention is not applied, and a schematic cross-sectional view of a main part of an upper half and a lower half for explaining the problem.

FIG. 5 is a schematic sectional view of a main part of a cartridge case when the present invention is applied.

FIG. 6 is a cross-sectional view of the upper half taken along a plane orthogonal to the cross section of FIG.

FIG. 7 is a diagram for explaining a thickness dimension of a thickened portion in FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cartridge case 1a Cartridge case upper surface 1b Cartridge case lower surface 2 Upper half 3 Lower half 4 Tape pull-out opening 5 Slide door 7 Opening 8 Convex part 9 Concave part 10 Thin part 12 Thick part 14 Filled part 15 Thinning Department

Claims (3)

[Claims] 1. A single reel on which a magnetic tape is wound is rotatably accommodated in a flat cartridge case having a flat upper surface and a lower surface, and a label attaching area is recessed on one side surface of the cartridge case. A magnetic tape cartridge, wherein a concave portion is formed on an upper surface or a lower surface of the cartridge case, the concave portion for preventing displacement of the magnetic tape cartridge during stacking, is formed adjacent to the label attaching region. A magnetic tape cartridge, wherein a thickened portion is provided on the back side of the concave portion of the case. 2. A single reel having a magnetic tape wound thereon is rotatably accommodated in a flat cartridge case having a flat upper surface and a lower surface, and a label sticking area is recessed on one side surface of the cartridge case. A magnetic tape cartridge, wherein a convex portion is formed on an upper surface or a lower surface of the cartridge case to prevent a positional shift when the magnetic tape cartridges are stacked, and is formed adjacent to the label attaching region. A magnetic tape cartridge, wherein a thinned portion is provided on the back side of the projection of the cartridge case. 3. A single cartridge on which a magnetic tape is wound is rotatably accommodated in a flat cartridge case including an upper half having a flat upper surface and a lower half having a flat lower surface, wherein the cartridge is rotatable. On one side surface of the case, a label sticking area is recessed over the upper and lower halves, and on one of the upper surface or the lower surface of the cartridge case, to prevent a displacement during stacking of the magnetic tape cartridge. A convex portion is formed adjacent to the label sticking area, and a concave portion is formed on the other of the upper surface or the lower surface of the cartridge case with which the convex portion of the cartridge case adjacent above or below engages when stacked. A magnetic tape cartridge, wherein a thickened portion is provided on the back side of the concave portion of the cartridge case; Magnetic tape cartridge characterized in that a reduced thickness portion on the back side of the convex portion of the case.