JPH11353848A - Magnetic tape cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a magnetic tape cartridge having a magnetic tape wound around a single reel encased rotatably in a cartridge case in which the forward end part of the magnetic tape can be surely connected with a leader pin at a specified position. SOLUTION: A leader pin comprises a shaft part 15 provided, at the opposite ends thereof, with parts 12 to be engaged with a tape feed mechanism on the apparatus side when a magnetic tape cartridge is set in a recorder/reproducer, and a member 16 being fitted to the outer circumference of the shaft part 15 from the side in order to clamp the forward end part of a magnetic tape between the member 16 and the shaft part 15. A groove 15a is made in the shaft part 15 along the axial direction thereof and a projecting edge 17 to be fitted in the groove 15a is formed in the clamp member 16.

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 cartridge case, and more particularly, to a leader pin attached to a leading end of a magnetic tape. It is about structure.

[0002]

2. Description of the Related Art Conventionally, a magnetic tape cartridge used as a recording medium for use in an external storage device such as a computer has a single reel on which a magnetic tape is wound, which comprises an upper half and a lower half. Some are rotatably housed in a flat cartridge case having a substantially square planar shape.

[0003] These magnetic tape cartridges are mainly used as a backup for computer memory.

Conventional magnetic tape cartridges of this type include, for example, two types, one of which is formed at one corner of a cartridge case in a state where the magnetic tape is completely wound around a reel when not in use. The leading end of the magnetic tape is locked to a leader block accommodated so as to cover the tape pull-out opening.

In another type, a lid which can be opened and closed in a cartridge plane direction is spring-biased toward a closed position in a tape drawing opening formed in one side wall of a cartridge case. And the tip of the magnetic tape is locked by a hook incorporated in the tape pull-out opening.

When a magnetic tape cartridge having such a configuration is set in a recording / reproducing device of a corresponding external storage device, the device engages with the rotation teeth of the device on the reel engaging teeth exposed at the center of the lower half. In the former case, the leader block is pulled out together with the magnetic tape by the tape pull-out mechanism on the device side, and in the latter case, the leader block is pulled out earlier by the tape pull-out mechanism on the device side. Is opened, the hook is pulled out with the magnetic tape,
The magnetic tape is pulled into a predetermined position on the tape running path, and writing / reading of data to / from the magnetic tape becomes possible.

[0007]

Recently, it has been desired to reduce the size of the apparatus. From such a viewpoint, it has been studied to reduce the size of the leader pin drawn into the apparatus, and for that purpose, it is desired to simplify the structure of the tip of the leader pin and the magnetic tape.

In view of such circumstances, the present invention provides a magnetic tape comprising a single reel on which a magnetic tape is wound rotatably housed in a cartridge case, and a leader pin attached to a tip of the magnetic tape. In a tape cartridge, it is an object to provide a structure of a leader pin that can simply and reliably connect a leading end portion of a magnetic tape to the leader pin.

[0009]

According to one aspect of the present invention, the leader pin has an engaging portion which engages with a tape pull-out mechanism of the apparatus when the magnetic tape cartridge is set in an external apparatus. A main body provided at both ends, and a clamping member that has an opening extending in the axial direction and is elastically fitted to the main body from the side and clamps a tip portion of the magnetic tape between the main body, At least one of the main body and the clamp member is provided with positioning means for positioning the magnetic tape with respect to the leader pin (claim 1).

In this case, the positioning means includes a groove formed along the axial direction of the clamp member fitting portion of the main body, and a projecting edge formed on the clamp member to engage with the groove. Can be configured by

Further, the positioning means may be constituted by a step formed at both ends in the axial direction at the opening edge of the clamp member.

Further, the positioning means may be constituted by step portions formed at both ends in the axial direction of the clamp member fitting portion of the main body.

According to another aspect of the present invention, the leader pin includes a main body having engagement portions at both ends for engaging with a tape pull-out mechanism of the apparatus when the magnetic tape cartridge is set in an external apparatus. And a pair of joining members joined from both sides of the main body with a magnetic tape sandwiched therebetween (claim 2).

According to still another aspect of the present invention, the leader pin includes a tape clamp portion composed of two members elastically fitted to each other and sandwiching the leading end of the magnetic tape therebetween. It is characterized by the following (claim 3).

According to still another aspect of the present invention, a slit extending in the axial direction is formed in the leader pin, and the tip of the magnetic tape inserted into the slit is pressed into the slit by a wedge-shaped clamp member. (Claim 4).

According to still another aspect of the present invention, a slit extending in the axial direction is formed in the leader pin, and a magnetic tape having a leading end inserted into the slit is wound around the leader pin. (Claim 5).

According to still another aspect of the present invention, the leader pin is made of a plastic material in which one end of the heat-resistant sheet is insert-molded, and the tip of the magnetic tape is connected to the other end of the heat-resistant sheet. It is a feature (claim 6).

According to still another aspect of the present invention, a leader sheet is connected to the leading end of the magnetic tape, and a slit is formed in the leader pin for inserting the leading end of the leader sheet. The leader sheet is provided with engaging means for connecting the leader sheet to the leader pin (claim 7).

According to still another aspect of the present invention, the leader pin includes a main body and a clamp member fitted on the outer periphery of the main body, and the main body has a shaft to which a tip of a magnetic tape is attached. And an engaging portion formed on both outer sides of the shaft portion and engaging with a tape pull-out mechanism on the device side when the magnetic tape cartridge is set in an external device. An inner flange protruding from each of the sections and an outer flange formed outside each of the engagement portions and held detachably on the cartridge case are integrally provided, and the clamp member includes: The tip portion of the magnetic tape is elastically fitted to the shaft portion of the leader pin main body from the side and clamps the tip of the magnetic tape between the shaft portion and the outer peripheral surface of the shaft portion.

The height from the outer peripheral surface of the engaging portion of the leader pin body to the outer peripheral surface of the outer flange is h,
When the height from the outer peripheral surface of the shaft portion to the outer peripheral surface of the inner flange is a, and the height from the outer peripheral surface of the engagement portion to the outer peripheral surface of the inner flange is b, of a and b, At least one is set to a dimension of 2 / 3h or less (claim 8).

In this case, the clamp member may be provided with an annular groove on the inner peripheral surface at both end portions thereof so as to receive the inner flange of the main body so as to cover both inner flanges.

Further, an annular groove is provided instead of the inner flange at the position of the inner flange projecting so as to partition between each engagement portion and the shaft portion, and the inner peripheral surface at both ends of the clamp member is provided. A projection may be provided to be fitted into the annular groove (claim 10).

According to yet another aspect of the present invention, the leader pin is formed by joining two halves having a joining surface passing through the axis thereof, and each half is arranged in the direction of the axis. On the other hand, concave and convex portions having a complementary relationship when coupled in opposite directions are provided on the coupling surface, and the magnetic tape is clamped on the coupling surface. Claim 11).

According to still another aspect of the present invention, the leader pin includes a hollow cylindrical body having a shaft hole and an axially extending slit communicating with the shaft hole from the outer peripheral surface; A shaft having a semicircular or D-shaped cross-section inserted into the shaft hole and rotatable about the axis, wherein the shaft is formed in the shaft hole in the slit at the leading end of the magnetic tape. The magnetic tape is rotated from a position allowing insertion into the shaft hole through the shaft, and clamps the magnetic tape by sandwiching the leading end portion between the magnetic tape and the inner peripheral surface of the shaft hole (claim). Item 12).

According to still another aspect of the present invention,
When the clamp member is used, a ridge for filling the opening of the clamp member fitted to the leader pin main body may be formed on the outer peripheral surface of the main body along the axial direction.
3).

In this case, it is preferable that protrusions projecting in the circumferential direction of the main body and capable of positioning the magnetic tape in the width direction are formed at both ends of the protrusion.

When a clamp member is used, an annular leader tape is attached to the leading end of the magnetic tape, and the annular leader tape is fitted to the leader pin body, and then the clamp member is fitted to the body so that the main body and the main body are connected to each other. The leader tape may be clamped between the clamp members (claim 14).

Further, the leader tape having heat shrinkability may be fitted to the leader pin without using the clamp member, and then the leader tape may be heated and contracted to be fixed to the leader pin.

Furthermore, it is preferable that a rough surface is formed on at least one of the magnetic tape engaging surface of the leader pin main body and the magnetic tape engaging surface of the clamp member.

Further, it is preferable that the magnetic tape is clamped between the leader pin main body and the clamp member with the leading end of the magnetic tape folded back (claim 17).

It is preferable that a flat portion is formed at at least one position on the outer peripheral surface of the clamp member.

[0032]

According to the present invention, the leading end of the magnetic tape can be reliably connected to the leader pin while having a very simple structure.

In particular, since at least one of the main body and the clamp member is provided with positioning means for positioning the magnetic tape with respect to the leader pin, the magnetic tape can be correctly connected to the leader pin.

Further, when the leader pin is constituted by the main body and a pair of joining members joined from both sides of the main body with the magnetic tape sandwiched therebetween, the productivity is good and the magnetic tape can be used. Positioning is also easy.

Further, when the leader pin is provided with a hinge-shaped tape clamp portion which is elastically fitted to each other and sandwiches the leading end of the magnetic tape, the connection of the magnetic tape to the leader pin is extremely high. It will be easier.

In particular, in the case where the leading end of the magnetic tape is clamped in the slit by the wedge-shaped clamp member pressed into the slit, there is an advantage that the structure of the leader pin is simplified.

Further, when a leader pin having one end of a heat-resistant sheet formed by insert molding is used, there is no need to provide a tape clamping means on the leader pin side, and thus there is an advantage that it is easy to form a small-diameter leader pin.

Further, a leader sheet is connected to the leading end of the magnetic tape, and a slit for inserting the leading end of the leader sheet into the leader pin is formed. Engaging means is provided inside the slit and the leader sheet. In this case, the connection between the leader pin and the leader sheet is facilitated, and escape of the leader sheet from the slit can be prevented.

Further, with respect to the shaft of the leader pin body having a shaft to which the leading end of the magnetic tape is attached,
In a leader pin having a configuration in which a clamp member is fitted from the side and a magnetic tape is clamped between the outer peripheral surface of the shaft portion and the clamp member, positioning of the magnetic tape and the clamp member, In order to protect the tape end when engaged with the tape pull-out mechanism on the device side, between the engaging portion and the shaft portion which engage with the tape pull-out mechanism on the device side when the magnetic tape cartridge is set in the external device. Although it is preferable to provide an inner flange, since the inner flange is generally thin, if formed to have the same diameter as the outer flange, there may be a problem in strength and productivity. This problem can be solved by setting at least one of the dimensions a and b to 2 / 3h or less.

In addition, an annular groove is provided instead of the inner flange at a position where the inner flange of the leader pin body is provided, and a protruding edge portion to be fitted into the annular groove is provided on the inner peripheral surfaces of both ends of the clamp member. The above-mentioned problem can be solved by providing the same, and accurate positioning of the clamp member and accurate positioning of the magnetic tape by this can be achieved. Damage to the tape end due to engagement can be prevented.

Further, the leader pin is constituted by two halves having a concave-convex portion on the coupling surface, the concave-convex portion having a complementary relationship when coupled in directions opposite to each other with respect to the direction of the axis. In this case, the two halves can be formed of one type of component, so that the manufacture of the leader pin is facilitated and the magnetic tape is firmly clamped by the concave and convex portions fitted to each other. be able to.

The above-mentioned leader pin has a hollow cylindrical body provided with a slit, and a shaft body having a semicircular or D-shaped cross-sectional shape inserted into a shaft hole of the hollow cylindrical body and rotatable around an axis. In this case, since the magnetic tape can be clamped only by rotating the shaft in the shaft hole, there is an advantage that the assemblability of the leader pin is good.

Further, a ridge for filling the opening of the clamp member fitted to the leader pin main body is formed along the axial direction on the outer peripheral surface of the main body, so that the C is attached to the leader pin main body.
In spite of the fact that the U-shaped clamp member is fitted, the outer peripheral surface of the leader pin can be made smooth, and the protrusions allow the magnetic tape to be positioned in the width direction of the magnetic tape and the magnetic tape after clamping. Can be locked at the leading edge.

When a clamp member is used, an annular leader tape is attached to the tip of the magnetic tape.
When the clamp member is fitted to the main body after the annular leader tape is fitted to the leader pin main body, the positioning of the magnetic tape with respect to the leader pin becomes easy, and the splice portion between the magnetic tape and the leader tape is shortened. Therefore, when the magnetic tape cartridge is mounted on the external device, the influence of the step due to the splice can be eliminated.

When the annular leader tape attached to the tip of the magnetic tape is made of a heat-shrinkable tape, the leader tape is fitted to the leader pin, and then heated only by heating the leader tape. Since it can be fixed, the clamp member can be omitted.

Further, a rough surface is formed on at least one of the magnetic tape engaging surface of the leader pin main body and the magnetic tape engaging surface of the clamp member by graining, corrosion machining, electric discharge machining, etc. Of the magnetic tape can be prevented.

Further, if the magnetic tape is clamped between the leader pin main body and the clamp member in a state where the leading end portion is folded, even when a thin tape is used,
Since the tape is not easily torn and the gap between the leader pin main body and the clamp member can be filled, the tape does not easily fall off the leader pin, and a damper action for the leader pin when the magnetic tape is pulled is obtained. be able to.

Further, by forming a flat portion at at least one position on the outer peripheral surface of the clamp member, there is an effect in terms of regulating the direction when pressing the clamp member into the leader pin body from the side or securing a pressing area.

[0049]

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

FIGS. 1 and 2 are perspective views of a magnetic tape cartridge according to the present invention. FIG. 1 shows a closed state of the slide door, and FIG. 2 shows an open state of the slide door.

The magnetic tape cartridge has an upper half 1a.
And a lower half 1b in the cartridge case 1,
A single reel on which a magnetic tape is wound is rotatably accommodated. On one side wall of the cartridge case 1, a tape pull-out opening 2 for pulling out one end of the magnetic tape is formed across the upper half 1a and the lower half 1b and close to the corner. The sliding door 3 for opening and closing the tape pull-out opening 2 is inserted in the direction in which the magnetic tape cartridge is inserted into the external device (arrow A in FIG. 2).
(Indicated by) is provided so as to be slidable in a direction parallel to the direction. The slide door 3 is urged toward the closed position by a spring interposed between the cartridge case 1 and the rear end surface of the slide door 3 inside the cartridge case 1, and is held at the closed position. .

A concave portion 6 is provided on the upper and lower inner wall surfaces inside the tape pulling-out opening portion 2, and as apparent from FIG. When the magnetic tape cartridge is inserted into a corresponding recording / reproducing device such as an external storage device, the lower half 1b
The rotation drive means on the apparatus side engages with the engagement teeth of the reel (not shown) exposed at the opening at the center of the slide door, and the member on the apparatus side contacts the front end face 3a of the slide door 3 so that the slide door 3 The magnetic tape is set on the apparatus side by being opened, and the leader pin 4 is clamped by the above-described tape pull-out mechanism and drawn into the apparatus together with the magnetic tape, so that writing / reading of data to / from the magnetic tape becomes possible.

Also, on one side of the cartridge case 1,
A rotary operation knob 5 for preventing erasure and double writing of the magnetic tape is exposed.

FIG. 3 is a perspective view showing a standard outer shape of the leader pin 4. The tape clamp 11 clamps the leading end of the magnetic tape 10, and the small diameter portions formed at the upper and lower ends of the tape clamp 11. 12, 12 and the small diameter portion 12, 1
The tape clamp portion 11 is formed outside the tape clamp portion 11 and has flanges (head portions) 13 and 13 having substantially the same diameter as the tape clamp portion 11. When the magnetic tape cartridge is set in an external device, the small-diameter portions 12 constitute an engaging portion that engages with a tape pull-out mechanism on the device side, and the flanges 13 include the cartridge case 1. 2 is engaged with the leader pin housing recess 6 (FIG. 2) inside the tape pull-out opening 2, and the leader pin 4 is held in the cartridge case 1 by the flanges 13, 13. The tape clamp portion 11 has a width of ２
It has a length corresponding to the magnetic tape 10 of inches (12.7 mm). In this case, the outer diameter of the small diameter portion 12 is 1.6 mm, and the outer diameter of the flange 13 is 3.2 mm.

FIGS. 4 and 5 are an exploded perspective view and a cross-sectional view showing a first embodiment of the tape connecting structure of the leader pin.

The leader pin 4 of the present embodiment has a main body 14 made of metal or hard plastic, and
And a resilient clamp member 16 made of metal or hard plastic, which is fitted from the side to the outer periphery and constitutes the tape clamp portion 11 of FIG. 3 together with the main body 14. The main body 14 is provided with a shaft portion 15 having substantially the same thickness as the small-diameter portions 12, 12 as a clamp member fitting portion between the small-diameter portions 12, 12, and outside the small-diameter portions 12, 12. The flanges 13 are formed integrally. A groove 1 is formed on the outer peripheral surface of the shaft portion 15 of the main body 14 along the axis thereof.
5a are formed.

The clamp member 16 has an opening 16 a extending in the axial direction over its entire length, has a C-shaped cross-sectional shape, and has a magnetic tape between its inner peripheral surface and the outer peripheral surface of the shaft portion 15. The end portion of the magnetic tape 10 is elastically clamped by being elastically fitted to the outer periphery of the shaft portion 15 from the side with the interposition of the magnetic tape 10. The clamp member 16 is made of, for example, SUS to improve its elasticity.
It is desirably formed of precipitation hardening steel such as 631.

In this embodiment, the clamp member 1
The groove 1 of the shaft 15 is provided at one of the edges along the opening 16a of the shaft 6.
A protruding edge portion 17 extending in the axial direction which can be engaged with 5a is integrally provided inwardly.

With such a configuration, as shown in the sectional view of FIG. 5A, the clamp member 16 is attached to the shaft portion 15 in such a manner that the protruding edge portion 17 is engaged with the groove 15a of the shaft portion 15. When the magnetic tape 10 is fitted, the magnetic tape 10 can be easily positioned with respect to the leader pin 4 by bringing the leading edge of the magnetic tape 10 into contact with the inner end face 17 a of the protruding edge 17.

In FIGS. 4 and 5A, the shaft 1
5 has a circular cross-sectional shape, the clamp member 1
Although the cross-sectional shape of the tape clamp portion 11 after the fitting of the tape clamp 6 is non-circular, the clamp 15 is formed by forming the shaft portion 15 into a non-circular cross-sectional shape as shown in FIG. Tape clamp portion 11 after member 16 is fitted
Can have a circular outer cross section.

Further, as shown in FIG. 5C, a groove 17b into which the leading edge of the magnetic tape 10 can be engaged is formed at the root of the inner end face 17a of the protruding edge 17 of the clamp member 16. The positioning of the magnetic tape 10 can be made easier.

Further, as shown in FIG. 6, one end of a groove 15a formed on the outer periphery of the shaft portion 15 in the axial direction is provided with a groove 15a.
A short groove 15b perpendicular to the groove 15b may be connected to the groove 15a, and a protruding edge 16b that can fit into the groove 15b may be formed on the inner surface of the axial end of the clamp member 16. In this case, the magnetic tape 10 is attached to the protruding edge 16b.
The positioning of the magnetic tape 10 in the lateral direction (the axial direction of the leader pin 4) is facilitated by bringing the side edges of the magnetic tape 10 into contact with each other.

Next, FIG. 7 is an exploded perspective view showing a second embodiment of the tape connecting structure of the leader pin, and shows a structure for facilitating the positioning of the magnetic tape 10 in the horizontal direction. FIG.
Also in the case of (1), a clamp member 16 which is elastically fitted to the shaft portion 15 of the main body 14 is provided.
5a is omitted, so that the clamp member 16 does not have the protruding edge portion 17. In the present embodiment, steps 16c, 16c are formed at both ends in the axial direction at the edge of the opening 16a of the clamp member 16 on the insertion side of the magnetic tape 10, so that the position of the magnetic tape 10 in the horizontal direction can be adjusted. It is clear that we can regulate.

As shown in FIG. 8 showing a third embodiment of the tape connecting structure of the leader pin, the outer diameter of the shaft portion 15 which is the clamp member fitting portion of the main body 14 is reduced to the small diameter portions 12 and 12.
The diameter of the magnetic tape 10 may be slightly smaller than that of the shaft 15, and the steps 15c, 15c may be formed between the shafts 15 and the small diameters 12, 12, thereby positioning the magnetic tape 10 in the lateral direction.

All of the above embodiments include a clamp member 16 having a C-shaped cross section which is elastically fitted to the shaft portion 15 of the main body 14, and at least one of the main body 15 and the clamp member 16. On the other hand, it has a configuration provided with a positioning means for positioning the magnetic tape 10 with respect to the leader pin 4, but the tape connection of the leader pin 4 without using the clamp member 16 having a C-shaped cross-section The structure will be described with reference to FIGS.

FIG. 9 shows a fourth embodiment of the tape connecting structure of the leader pin. The main body 14 of the leader pin 4 has the same configuration as that shown in FIG. A split plastic joining member 18 is provided. These joining members 18, 18 are shown in FIG.
As shown in (a) and (b), the magnetic tape 10 and the shaft 15 are joined together using an adhesive. After joining,
The leading end of the magnetic tape 10 projecting from the outer peripheral surfaces of the clamp members 18, 18 is cut in a later step. The present embodiment has an advantage of good productivity, and the positioning of the magnetic tape 10 is easy.

FIGS. 11 to 13 show a fifth embodiment of the tape connecting structure of the leader pin and its modification, in which the magnetic tape 10 is elastically fitted to each other with the magnetic tape 10 sandwiched therebetween. The tape clamp portion 11 of the leader pin 4 is constituted by the two members 19A and 19B. in this case,
At least one of the members 19A and 19B is formed of a material having elasticity. In each of FIGS. 11 to 13,
11A shows a state before the tape clamp, and FIG. 11B shows a state after the tape clamp. FIGS. 11 and 12 show a type having a hinge H, and FIG.

FIGS. 14 and 15 (a) and 15 (b) are a front view and a sectional view showing a sixth embodiment of the tape connecting structure of the leader pin. The tape clamp portion 11 of the leader pin 4 is provided with a tape insertion slit 20 penetrating therethrough in the axial direction.
Reference numeral 0 denotes a tapered shape in which at least the cross-sectional shape of the opening 20a on the opposite side to the tape insertion port becomes narrower toward the center, as shown in FIG. Then, the magnetic tape 10 inserted into the slit 20 from above in FIG.
1 is formed by a wedge-shaped clamp member 21 press-fitted into the slit 20 from the side of the tapered opening 20a.
It is configured to be clamped as shown in FIG. This embodiment has an advantage that the structure of the leader pin 4 is simplified. Further, it is preferable that the wedge-shaped clamp member 21 is formed so that the radius of curvature of the outer periphery thereof is the same as the radius of curvature of the leader pin 4.

FIGS. 16 (a) and 16 (b) corresponding to FIGS. 15 (a) and 15 (b) show wedge-shaped arms having hooks 23a, 23a at the tip of an elastic bifurcated arm. An embodiment in which a clamp member 23 is used will be described. In this case, the slit 22 has an opening 22 opposite to the tape insertion port.
a is formed in a tapered shape in which the cross-sectional shape becomes narrower toward the center, and stepped portions 22b, 22b which are engaged with the hooks 23a, 23a of the wedge-shaped clamp member 23 are formed in the middle of the slit 22. The hook 2 of the wedge-shaped clamp member 23 press-fitted from the side of the tapered opening 22a.
The magnetic tape 10 and the clamp member 23 are configured so as not to come out of the slit 22 by the engagement of the step portions 3a, 23a with the step portions 22b, 22b.

FIGS. 17A to 17D show a seventh embodiment of the tape connecting structure of the leader pin. In the present embodiment, the tape clamp 11 of the leader pin 4
The slit 24 into which the tip of the magnetic tape 10 is inserted
The slit 24 is provided in FIG.
It may penetrate the tape clamp part 11 as shown in (b) or may not penetrate as shown in FIG. 17 (c). Then, as shown in FIG. 17D, the magnetic tape 10 having the leading end inserted into the slit 24 is wound around and held by the tape clamp unit 11 without being bonded.

In order to facilitate the formation of the slit 24, the slit 24 is formed so as to reach the flanges 13 by wire cutting or the like, as shown in FIGS. Is also good. Also, as shown in FIG. 18C, a thin portion 11a may be formed in the tape clamp portion 11 outside the slit 24 so as to have elasticity, and the magnetic tape 10 may be sandwiched.

FIG. 19 is a view showing an eighth embodiment of the tape connecting structure of the leader pin. The present embodiment has a configuration in which the magnetic tape 10 is not directly connected to the leader pin 4 but is connected to the leader pin 4 via a separate sheet. That is, when forming the leader pin 4 made of plastic, as shown in the cross-sectional view of FIG. 20A, a heat-resistant sheet 25 having substantially the same width as the magnetic tape 10 is inserted and integrally formed. At the end of the protruding heat-resistant sheet 25, a magnetic tape 10
Are connected to each other.

In this case, prior to the insert molding, the bent portions 25a and 25b as shown in FIGS. 20 (b) and 20 (c) are formed at the tip of the heat-resistant sheet 25, or as shown in FIG. The bonding strength between the leader pin 4 and the heat-resistant sheet 25 can be increased by forming the small holes 25c as shown in FIG.

In the present embodiment, the leader pin 4
Since there is no need to provide a tape clamping means on the side, there is an advantage that the production of the small-diameter leader pin 4 becomes easy.

A heat-sensitive adhesive is applied to the heat-resistant sheet 25 side without using the splicing tape 26, and the magnetic tape 10 is thermocompression-bonded to the heat-resistant sheet 25 as shown in FIG. Is also good.

FIG. 22 is an exploded front view showing a ninth embodiment of the tape connecting structure of the leader pin, and FIGS.
(B) is a cross-sectional view along the line AA and the line BB of FIG. 21, respectively.

In this embodiment, a leader sheet (or tape) 28 having appropriate strength and rigidity, such as a photographic film, is connected to the leading end of the magnetic tape 10 by using a splicing tape 26 or the like. Slit 29 into which the tip of leader sheet 28 is inserted
Are formed on the leader pin 4 side.

In this case, appropriate engaging holes 28a, 28a are formed on both sides of the leading end portion of the leader sheet 28, and the engaging holes 28a, 28a engaged with the engaging holes 28a, 28a of the leader sheet 28 are formed inside the slits 29. It is preferable to provide the projections 30, 30 and a holding projection 31 for pressing the central portion of the leading end of the leader sheet 28 from the side opposite to the engaging projections 30, 30.

In the present embodiment, the connection between the leader pin 4 and the leader sheet 28 is facilitated, and the leader sheet 28 can be prevented from coming out of the slit 29.

Next, FIGS. 24A to 24C are cross-sectional views showing a tenth embodiment of the tape connecting structure of the leader pin, and FIG. 25 is a sectional view taken along line XXV-XXV of FIG. FIG. 26 is a sectional view for explaining the dimensions of the main part.

In this embodiment, as in the first to third embodiments, the main body 14 of the leader pin 4 has the shaft 15 to which the tip of the magnetic tape 10 is attached. As shown in FIG. 25, a clamp member 16 having a C-shaped cross section is elastically fitted from the side, and the magnetic tape 10
In addition to the above, the main body 14 has the above-mentioned shaft portion 15 and the small-diameter portions 12 (magnetic tape cartridges) formed on both outer sides of the shaft portion 15. An inner flange 32 for tape positioning is formed to partition between an external device and an engaging portion that engages with a tape pull-out mechanism of the device when set in an external device.

Then, as shown in FIG.
The height from the outer peripheral surface of the outer flange (head portion) 13 to the outer peripheral surface of the outer flange (head portion) 13 is h, the height from the outer peripheral surface of the shaft portion 15 to the outer peripheral surface of the inner flange 32 is a, and the outer peripheral surface of the small diameter portion 12 When the height from the to the outer peripheral surface of the inner flange 32 is b, at least one of the above a and b is set to a dimension of 2 / 3h or less.

24A to 24C, FIG.
In the leader pin 4 shown in (a), the outer diameter of the shaft portion 15 and the outer diameter of the small-diameter portion 12 are the same, and a = b ≦ 2/3.
h. The clamp member 16 has an axial length slightly shorter than the inner dimension between the inner flanges 32, 32.

The leader pin 4 shown in FIG. 24B also has the same outer diameter of the shaft portion 15 and the smaller diameter portion 12 as in FIG. Has an axial length substantially equal to the external dimension between the inner flanges 32, 32, and has an annular groove 33 at the inner peripheral surface at both ends thereof capable of accommodating the inner flange 32. Are formed to cover the inner flanges 32, 32, respectively.

Further, the leader pin 4 shown in FIG.
Is b = h by having the inner flange 32 having substantially the same diameter as the outer flange 13.
5 is formed larger in diameter than the small-diameter portion 12, so that the condition of a ≦ 2 / 3h is satisfied. Accordingly, the clamp member 16 is a clamp member having a thickness smaller than that shown in FIGS. 24A and 24B, for example, made of a steel strip (stainless steel or the like is preferable in terms of corrosion resistance and difficulty in magnetization). Has adopted.

As described above, in the present embodiment, the positioning of the magnetic tape 10 and the clamp member 16 with respect to the leader pin main body 14 can be performed accurately by providing the inner flanges 32, 32 on the leader pin main body 14. In addition to the possible benefits, the inner flange 3
Since the height from the shaft portion 15 and / or the small-diameter portion 12 of the second flange 2 is low so as to satisfy the above conditions, the inner flange 32 having a small thickness (about 0.4 to 0.6 mm) can be formed. Even if it is used, there is no risk of causing problems in strength and productivity.

FIG. 27 is a sectional view showing an eleventh embodiment of the tape connecting structure of the leader pin.

In the embodiment shown in FIG. 24B described above, a protrusion is formed by the inner flange 32 on the leader pin main body 14 side, and a recess is formed by the annular groove 33 on the clamp member 16 side. In the present embodiment, in contrast to this, a concave portion is formed on the leader pin body 14 side and a convex portion is formed on the clamp member 16 side. That is, as shown in FIG.
An annular groove 34 that separates between the shaft 2 and the shaft portion 15 is formed, and protruding edges 35 that are respectively fitted into the annular grooves 34 are formed in an annular shape on the inner peripheral surfaces of both ends of the clamp member 16. .

In this embodiment, the leader pin body 14
Of the leader pin main body 1 by fitting the annular groove 34 formed in the clamp member 16 with the protruding edge 35 formed in the clamp member 16.
4, the positioning of the magnetic tape 10 with respect to the leader pin main body 14 can be performed accurately by the protruding edge portion 35 of the clamp member 16, and at the same time, the tape of the external device can be used. It is possible to prevent the tape end from being damaged when the pull-out mechanism and the small-diameter portion 12 are engaged.

Also, since the inner flange is not used,
Problems that may occur when the inner flange having a small thickness and a high height are used can also be avoided.

FIGS. 28 to 31 show the twelfth embodiment of the tape connecting structure of the leader pin.
Is a perspective view of a leader pin, FIG. 29 is a perspective view of a half of the leader pin and a cross-sectional view of each part, FIG. 30 is a front view of a pair of halves, and FIG. 31 is a cross-sectional view of each part of the leader pin.

The leader pin 4 of the present embodiment is constituted by a pair of left and right halves 4L and 4R which are coupled to each other with a plane P passing through the axis thereof as a coupling surface.
As shown in FIG. 29, a groove 36 and a ridge 37 extending in the axial direction on the coupling surface P of the tape clamp portion 11 are provided at symmetrical positions with respect to the center line. A fitting hole 38 that penetrates to the outer peripheral surface of the flange 13 is provided in the coupling surface P of the flange (head portion) 13 in the upper part of the figure, and faces outward at a middle position of the fitting hole 38. Steps 38a,
38a are formed. Further, a fitting projection 39 having a shape and dimensions capable of fitting into the hole 38 is protruded from the coupling surface P of the lower flange 13 in the figure.
9 is a pair of hook-shaped elastic engaging pieces 39a, 39 each having a step portion 39b facing the coupling surface P on the outer surface.
a.

The other half 4R of the leader pin 4 is also a part having the same shape and dimensions as the one half 4L, and the other half 4R is turned upside down as shown in FIG. When the coupling surfaces P, P face each other, the concave and convex portions of both coupling surfaces P, P have a complementary relationship with each other. Therefore, the two halves 4L, 4R are provided with the leading end of the magnetic tape 10 interposed between the tape clamps 11, 11.
Is pressed into contact with one half of the engaging pieces 39a, 39a.
Are inserted into the fitting holes 38 of the other half in a state where they are elastically bent toward each other, and as shown in FIG. The two halves 4L and 4R are connected in a state where the two halves 4L and 4R are engaged with the respective steps 38a. In this connection state, in order to make the outer peripheral surface of the flange 13 as smooth as possible, the engaging piece 39a is formed so that the curvature of the tip of the engaging piece 39a matches the curvature of the outer peripheral surface of the flange 13. Preferably.

At the same time, the protrusion 37 of the tape clamp portion 11 of one half is inserted into the groove 36 of the tape clamp portion 11 of the other half via the magnetic tape 10 so that the magnetic tape 10 is firmly clamped on the joint plane P between the two halves 4L, 4R.

In this embodiment, the leader pin 4 having the tape clamping function can be constituted by using two parts of one kind, and only by pressing the two halves 4L and 4R together. Since the assembly of the leader pin 4 and the clamping of the magnetic tape 10 can be achieved, the configuration is extremely excellent in terms of productivity.

In this embodiment, both halves 4
L, 4R flange 13 engages, leader pin 4
32, instead of this, for example, as shown in FIG. 32, in a state where the convex portion 42 of the flange 13 of the other half is fitted into the concave portion 41 of the flange 13 of the other half. Alternatively, the two halves 4L and 4R may be joined using an adhesive. In this case, there is an advantage that no hole is formed on the outer peripheral surface of the flange 13.

FIGS. 33 to 35 show the thirteenth embodiment of the tape connecting structure of the leader pin.
34 is an exploded front view of the leader pin, FIGS. 34A and 34B are cross-sectional views taken along lines AA and BB in FIG. 33, and FIG.
FIGS. 5A to 5C are views for explaining a tape clamping operation.

[0098] The leader pin 4 of the present embodiment also includes two members 4M and 4S.
3 and a tape clamp portion 11 formed of a hollow cylindrical body having an axially extending tape insertion slit 44 communicating from the outer peripheral surface to the shaft hole 43. One end of the tape clamp portion 11 has one thin portion. A diameter portion 12 and a flange 13 are provided, and the other end of the tape clamp portion 11 has a flat end surface in which a shaft hole 43 is opened. The other member 4S is provided with a shaft 45 rotatably inserted into the shaft hole 43, and the other small diameter portion 12 and the flange 13 are connected to one end of the shaft 45. Shaft 45
Has a semicircular or D-shaped cross section cut off so that one side of its outer peripheral surface becomes a substantially flat surface 45a.

In assembling the leader pin 4 in this case, first, the shaft 45 of the member 4S is inserted into the shaft hole 43 of the member 4M. At this time, as shown in FIG. 35A, the direction of the surface 45a of the shaft body 45 is set so that a cavity 46 communicating with the slit 44 is formed inside the shaft hole 43. Next, as shown in FIG. 35 (b), after inserting the leading end portion of the magnetic tape 10 into the space 46 of the shaft hole 43 through the slit 44, as shown in FIG. When the magnetic tape 10 is rotated in the counterclockwise direction, the magnetic tape 10 is clamped to the leader pin 4 in a state of being sandwiched between the cylindrical outer peripheral surface of the shaft 45 and the inner peripheral surface of the shaft hole 43. The advantage of this embodiment is that it is excellent in assemblability.

The order of inserting the shaft 45 and the magnetic tape 10 into the shaft hole 43 may be reversed. That is, first, the leading end of the magnetic tape 10 is slit 44
Through the shaft hole 43, and then the shaft body 45
With the shaft hole 43 so that the surface 45a is in the same direction as above.
You may make it insert in.

FIGS. 36 to 38 show the fourteenth embodiment of the tape connecting structure of the leader pin.
Is an exploded perspective view of the leader pin, FIG. 37 is a perspective view of the leader pin showing a state where the magnetic tape is clamped, and FIG. 38 is a cross-sectional view thereof.

The leader pin 4 of the present embodiment has a main body 14 made of metal or hard plastic, and a main body 14 made of metal or hard plastic.
And a resilient clamp member 16 made of metal or hard plastic, which is fitted from the side to the outer periphery and constitutes the tape clamp portion 11 of FIG. 3 together with the main body 14. The leader pin main body 14 includes the small-diameter portions 12, 12.
Between these small diameter portions 12, 12, a shaft portion 1 having substantially the same thickness as
5 is provided as a clamp member fitting portion, and flanges (head portions) 13, 13 are integrally formed outside the small diameter portions 12, 12. Shaft 1 of leader pin body 14
A ridge 47 is formed on the outer peripheral surface of the magnetic tape 10 along the axis thereof.
Projections 47a, 4 for positioning in the width direction
7 a is formed along the outer peripheral surface of the shaft portion 15.

As is apparent from the sectional view of FIG. 38, the ridge 47 has such a shape that the outer cross section of the tape clamp portion 11 of the leader pin 4 after the clamp member 16 is fitted becomes substantially circular. Have.

With such a configuration, the positioning of the leading edge of the magnetic tape 10 with respect to the leader pin 4 and the positioning in the width direction can be easily performed, and the fitting of the clamp member 16 having a C-shaped cross section can be performed. The outer cross section of the tape clamp portion 11 after the attachment can be made closer to a circle.

FIGS. 39 and 40 show a fifteenth embodiment of the tape connecting structure of the leader pin. FIG. 39 is an exploded perspective view, and FIGS. 40 (a) and (b) show magnetic tapes. It is a figure showing the connection state of a leader tape.

In this embodiment, the magnetic tape 10
A leader tape 48 is attached in an annular shape in advance to the tip of the magnetic tape 10. After the annular leader tape 48 is fitted to the shaft portion 15 of the leader pin body 14 from the axial direction, the magnetic tape 10 is pulled to the left in the drawing. Then, with the leader tape 48 in close contact with the shaft portion 15, the clamp member 16
Is fitted from the right side of the figure, the magnetic tape 10 is attached to the leader pin 4 via the leader tape 48.

In this case, as shown in FIG. 40A, the connection of the leader tape 48 to the magnetic tape 10 is achieved by a method other than using the splicing tape 49 as shown in FIG.
As shown in (b), a heat-sensitive adhesive is applied to the inner surface of the leader tape 48, and this leader tape 4
8 may be adhered to both sides of the magnetic tape 10 by heating. In that case, if necessary, use a leader tape 48
Can be bonded to the shaft 15 of the leader pin body 14 by heating.

Alternatively, although not shown, a heat-shrinkable plastic tape is used for the leader tape 48, and the annular leader tape 48 is attached to the shaft portion 15 of the leader pin body 14.
After being fitted from the axial direction, the leader tape 48 can be contracted by heating through and fixed to the shaft portion 15. In that case, the clamp member 16 can be omitted.

According to the present embodiment, even when the splicing tape 49 is used to connect the leader tape 48 to the magnetic tape 10, as shown in FIG. This makes it possible to reduce the possibility that the step of the splice portion will have an adverse effect when the leader pin 4 is mounted on an external device.

In general, when the clamp member 16 is formed of synthetic resin, when it is stored or used at a high temperature, the holding strength of the magnetic tape 10 by the clamp member 16 decreases due to the expansion of the synthetic resin material and a decrease in the elastic coefficient. However, the clamp member 16 is formed of a crystalline synthetic resin such as a polyamide-based, polyoxymethylene-based, or polybutylene terephthalate-based resin. By setting the temperature lower and setting the crystallinity to be lower, after clamping the magnetic tape, when the temperature rises, the crystallization proceeds and the clamp member shrinks, the holding strength of the magnetic tape increases,
Further, for the same reason, the elastic coefficient at the same temperature also increases, so that the holding strength of the magnetic tape by the clamp member 16 at a high temperature may not be reduced.

Further, the shaft 15 of the leader pin body 14
By forming a rough surface on at least one of the magnetic tape engaging surface and the magnetic tape engaging surface of the clamp member 16 by texturing, corrosion machining, electric discharge machining, or the like, the magnetic tape can be dropped from the leader pin 4. Can be prevented.

In this case, if the surface roughness Rz of the rough surface is too small, the tape engaging force is weak, and if it is too large, it becomes difficult for the clamp member 16 to protrude from the mold at the time of molding, Since there is a problem in that shaving powder is generated or the magnetic tape 10 is broken when 16 is mounted, the range of 0.7 μm ≦ Rz ≦ 30 μm is preferable, and the range of 1 μm ≦ Rz ≦ 20 μm is more preferable.

When the clamp member 16 is fitted to the shaft portion 15 of the leader pin main body 14, wrinkles may occur in the magnetic tape 10 due to the entrapped air. By forming slits or holes for air vents in the magnetic tape 10, the magnetic tape 10 can be easily clamped.

In the various embodiments described above, in the configuration in which the clamp member 16 is fitted to the shaft portion 15 of the leader pin main body 14 via the magnetic tape 10 from the side, the thickness of the magnetic tape 10 is reduced. If it is thin,
The magnetic tape 10 may be broken by the fitting of the clamp member 16. In such a case, FIG.
As shown in FIGS. 1 (a) to 1 (c), the tip of the magnetic tape 10 is bent one or more times to form a laminate 50, and the clamp member 16 is connected to the shaft 1 via the laminate 50.
5 may be fitted. Thereby, the thin magnetic tape 1
0 can be prevented, and the laminated body 50 interposed between the shaft portion 15 and the clamp member 16 functions as a damper when the magnetic tape 10 is pulled. In addition, as for the clamp member 16, as shown in FIG. 42, it is preferable to provide a flat portion 16f at at least one position on the outer peripheral surface. Generally, when the magnetic tape 10 is attached to the leader pin 4 using the clamp member 16, for example, as shown in FIG. 43, the clamp member is placed above the leader pin body 14 placed on the support 53 together with the magnetic tape 10. The clamp member 16 is held between the holding jigs 51 with the opening thereof directed downward, and the clamp member 16 is pushed into the shaft portion 15 of the leader pin main body 14 using a pushing tool 52.

Therefore, when the flat portions 16f, 16f parallel to the pressing direction of the clamp member 16 are formed on the outer peripheral surfaces on both sides of the clamp member 16, the clamp member 16 is supplied between the holding jigs 51, 51. When the flat portion 16f is formed on the outer peripheral surface of the clamp member 16 on the side opposite to the opening side, the clamp member 16 is moved to the leader using the pushing tool 52. The direction in which the pin body 14 is pushed into the shaft portion 15 is regulated, and the pressing area of the pushing tool 52 can be secured. Further, the shaft portion 15 of the leader pin body 14
If the flat portion 15f is also formed on the contact surface with the support 53, the leader pin main body 14 can be stably supported on the support 53.

Further, the connection structure of the magnetic tape 10 to the leader pin 4 is not limited to the above-described various embodiments, and for example, a so-called hot melt adhesive tape 54 and a thermocompression bonding tool 55 are used as shown in FIG. It is also possible to directly adhere the magnetic tape 10 to the leader pin 4. In this case, an adhesive layer having a uniform thickness can be formed as compared with the case where an adhesive is used, and a working environment is improved because a solvent does not need to be used.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a magnetic tape cartridge according to the present invention with its sliding door closed.

FIG. 2 is a perspective view showing the magnetic tape cartridge of FIG. 1 with its sliding door opened.

FIG. 3 is a perspective view showing a basic outer shape of a leader pin.

FIG. 4 is an exploded perspective view showing the first embodiment of the tape connecting structure of the leader pin.

FIG. 5 is an enlarged cross-sectional view of the tape connection structure shown in FIG. 4;

FIG. 6 is an exploded perspective view showing a modification of FIG. 4;

FIG. 7 is an exploded perspective view showing a second embodiment of the tape connecting structure of the leader pin.

FIG. 8 is an exploded perspective view showing a third embodiment of the tape connecting structure of the leader pin.

FIG. 9 is an exploded perspective view showing a fourth embodiment of the tape connecting structure of the leader pin.

FIG. 10 is a cross-sectional view of the tape connecting structure of the leader pin of FIG. 9;

FIG. 11 is a schematic cross-sectional view showing a fifth embodiment of the tape connecting structure of the leader pin.

FIG. 12 is a schematic cross-sectional view showing a modification of the tape connecting structure of the leader pin of FIG. 11;

FIG. 13 is a schematic cross-sectional view showing a modification of the tape connecting structure of the leader pin of FIG. 11;

FIG. 14 is a schematic front view showing a sixth embodiment of the tape connecting structure of the leader pin.

FIG. 15 is a sectional view taken along lines XV-XV in FIG. 14;

FIG. 16 is a sectional view showing a modification of FIG. 15;

FIG. 17 is a perspective view and a cross-sectional view showing a seventh embodiment of the tape connecting structure of the leader pin.

18 is a perspective view and a cross-sectional view showing a modification of the tape connecting structure of the leader pin of FIG.

FIG. 19 is a front view showing an eighth embodiment of the tape connecting structure of the leader pin.

20 is a sectional view taken along the line XX-XX in FIG.

FIG. 21 is a front view showing a modification of the tape connecting structure of the leader pin of FIG. 19;

FIG. 22 is an exploded front view showing a ninth embodiment of the tape connecting structure of the leader pin.

FIG. 23 is an enlarged transverse sectional view taken along lines AA and BB of FIG. 22;

FIG. 24 is a longitudinal sectional view showing a tenth embodiment of a tape connecting structure of a leader pin.

FIG. 25 is a sectional view taken along the line XXV-XXV in FIG.

FIG. 26 is a diagram for explaining dimensions of main parts in FIG. 24;

FIG. 27 is a longitudinal sectional view showing an eleventh embodiment of the tape connecting structure of the leader pin.

FIG. 28 is a perspective view showing a twelfth embodiment of the tape connecting structure of the leader pin.

29 is a perspective view of a half of the leader pin of FIG. 28 and a cross-sectional view of each part.

FIG. 30 is an exploded front view of the leader pin of FIG. 28;

FIG. 31 is a cross-sectional view of each part of the leader pin of FIG. 28;

FIG. 32 is a cross-sectional view showing a deformation of the fitting concave portion and the fitting convex portion in FIG. 29;

FIG. 33 is an exploded front view showing a thirteenth embodiment of a leader pin tape connecting structure;

FIG. 34 is a transverse sectional view taken along lines AA and BB of FIG. 34;

FIG. 35 is an explanatory diagram of the tape clamping operation of the leader pin of FIG. 33;

FIG. 36 is an exploded perspective view showing a fourteenth embodiment of a tape connecting structure of a leader pin.

FIG. 37 is a perspective view showing a state in which the leader pin of FIG. 36 clamps the tape.

FIG. 38 is a cross-sectional view of the leader pin of FIG. 37.

FIG. 39 is an exploded perspective view showing a fifteenth embodiment of the tape connecting structure of the leader pin.

FIG. 40 is a diagram showing a connection state of a leader tape to a magnetic tape.

FIG. 41 is a cross-sectional view showing a state in which the tip of the magnetic tape is folded back and clamped.

FIG. 42 is a perspective view of a clamp member having a flat portion.

FIG. 43 is an explanatory view showing a method of clamping the clamp member of FIG. 42;

FIG. 44 is an explanatory view showing a method of connecting a magnetic tape using a hot melt adhesive tape.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cartridge case 1a Upper half 1b Lower half 2 Tape pull-out opening 3 Slide door 4 Leader pin 4L, 4R Half of leader pin 10 Magnetic tape 11 Tape clamp part 12 Small diameter part (engagement part) 13 Flange (Head part) ) 14 Leader pin body 15 Shaft 15a Groove 16 Clamp member 17 Protrusion 18 Joining member 20, 22, 24, 29 Slit 21, 23 Wedge-shaped member 25 Heat-resistant sheet 28 Leader sheet 32 Inner flange 33, 34 Annular groove 35 Protrusion Part 36 concave groove 37 ridge 38 fitting hole 39 fitting convex part 43 shaft hole 44 slit 45 shaft body 46 void 47 ridge 48 leader tape 49 splicing tape 50 laminated body 51 holding jig 52 pushing tool 53 support table

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Seiji Tsukigi 2-1-1, Ogimachi, Odawara-shi, Kanagawa Prefecture Inside Fuji Photo Film Co., Ltd. (72) Hideaki Shiga 2-2-1-1, Ogimachi, Odawara-shi, Kanagawa Prefecture Fuji Photo Film Co., Ltd.

Claims (18)

[Claims] 1. A magnetic tape cartridge in which a single reel on which a magnetic tape is wound is rotatably housed in a cartridge case, and a leader pin is attached to a leading end of the magnetic tape. When the magnetic tape cartridge is set in an external device, a main body having engagement portions at both ends for engaging with a tape pull-out mechanism on the device side, and an opening extending in an axial direction is provided on the main body from the side. A clamp member that is elastically fitted and clamps a tip portion of the magnetic tape between the main body and the main body, wherein the magnetic tape is attached to at least one of the main body and the clamp member with respect to the leader pin. A magnetic tape cartridge provided with positioning means for positioning the magnetic tape cartridge. 2. A magnetic tape cartridge in which a single reel on which a magnetic tape is wound is rotatably housed in a cartridge case, and a leader pin is attached to a tip end of the magnetic tape. When the magnetic tape cartridge is set in an external device, a main body having engagement portions at both ends to engage with a tape pull-out mechanism on the device side, and both sides of the main body in a state where the magnetic tape is sandwiched therebetween A magnetic tape cartridge, comprising: a pair of joining members joined from each other. 3. A magnetic tape cartridge in which a single reel on which a magnetic tape is wound is rotatably housed in a cartridge case, and a leader pin is attached to a tip end of the magnetic tape. A magnetic tape cartridge comprising a hinge-shaped tape clamp portion elastically fitted to each other and sandwiching a leading end of the magnetic tape therebetween. 4. A magnetic tape cartridge in which a single reel on which a magnetic tape is wound is rotatably housed in a cartridge case, and a leader pin is attached to a leading end of the magnetic tape. A magnetic tape cartridge, wherein a slit extending in a direction is formed, and a leading end of the magnetic tape inserted into the slit is clamped by a wedge-shaped clamp member pressed into the slit. 5. A magnetic tape cartridge in which a single reel on which a magnetic tape is wound is rotatably housed in a cartridge case, and a leader pin is attached to a leading end of the magnetic tape. A magnetic tape cartridge, wherein a slit extending in a direction is formed, and the magnetic tape having a tip inserted into the slit is wound and held around the leader pin. 6. A magnetic tape cartridge in which a single reel on which a magnetic tape is wound is rotatably housed in a cartridge case, and a leader pin is attached to a tip end of the magnetic tape. A magnetic tape cartridge comprising a plastic material in which one end of a heat-resistant sheet is insert-molded, and a tip of the magnetic tape is connected to the other end of the heat-resistant sheet. 7. A magnetic tape cartridge in which a single reel on which a magnetic tape is wound is rotatably housed in a cartridge case, and a leader pin is attached to a front end of the magnetic tape. And a slit for inserting the leader sheet into the leader pin is formed. Engaging means for connecting the leader sheet to the leader pin is formed inside the slit and the leader sheet. A magnetic tape cartridge provided. 8. A magnetic tape cartridge in which a single reel on which a magnetic tape is wound is rotatably housed in a cartridge case, and a leader pin is attached to a tip end of the magnetic tape. A shaft portion to which the leading end of the magnetic tape is attached, and an engagement portion formed on both outer sides of the shaft portion to engage with a tape pull-out mechanism of the device when the magnetic tape cartridge is set in an external device. And an inner flange protruding from each of the engaging portions and the shaft portion, and an outer flange formed outside each of the engaging portions and held detachably on the cartridge case. And a clamp portion which clamps a tip portion of the magnetic tape between a main body provided in the main body and an outer peripheral surface of the shaft portion which is fitted to the shaft portion of the main body from the side. The height dimension from the outer peripheral surface of the engaging portion of the main body to the outer peripheral surface of the outer flange is h, the height dimension from the outer peripheral surface of the shaft portion to the outer peripheral surface of the inner flange is a, When a height from the outer peripheral surface of the engagement portion to the outer peripheral surface of the inner flange is b, at least one of the a and b is
A magnetic tape cartridge having a dimension set to 2 / 3h or less. 9. The clamp member has an annular groove on the inner peripheral surface at both ends thereof, which can accommodate the inner flange of the leader pin main body, and covers both inner flanges. 8. The magnetic tape cartridge according to 8. 10. A magnetic tape cartridge in which a single reel on which a magnetic tape is wound is rotatably accommodated in a cartridge case, and a leader pin is attached to a tip of the magnetic tape. A shaft portion to which the leading end of the magnetic tape is attached, and an engagement portion formed on both outer sides of the shaft portion to engage with a tape pull-out mechanism of the device when the magnetic tape cartridge is set in an external device. And an annular groove which is depressed to partition between each engaging portion and the shaft portion, and an outer flange which is formed outside each engaging portion and which is detachably held in the cartridge case. A main body provided on the inner peripheral surface of both ends provided with protruding edges to be fitted into respective annular grooves of the main body. And a clamp member for clamping a tip portion of the magnetic tape. 11. A magnetic tape cartridge in which a single reel on which a magnetic tape is wound is rotatably housed in a cartridge case, and a leader pin is attached to a tip end of the magnetic tape. It consists of a joined body of two halves with a mating surface passing through its axis, each half being in a complementary relationship when joined in opposite directions to said axis direction. A magnetic tape cartridge comprising an uneven portion provided on the coupling surface, and the magnetic tape being clamped on the coupling surface. 12. A magnetic tape cartridge in which a single reel on which a magnetic tape is wound is rotatably housed in a cartridge case, and a leader pin is attached to a tip end of the magnetic tape. A hollow cylindrical body having a shaft hole and a slit extending in the axial direction communicating with the shaft hole from the outer peripheral surface,
A shaft having a semicircular or D-shaped cross-section inserted into the shaft hole of the hollow cylinder and rotatable around an axis, wherein the shaft is provided with the magnetic tape in the shaft hole. The tip of the magnetic tape is rotated from a position allowing insertion into the shaft hole through the slit at the tip end, and the tip of the magnetic tape is clamped between the inner peripheral surface of the shaft hole and clamped. Characterized magnetic tape cartridge. 13. A magnetic tape cartridge in which a single reel on which a magnetic tape is wound is rotatably housed in a cartridge case, and a leader pin is attached to a tip end of the magnetic tape. When the magnetic tape cartridge is set in an external device, a main body having engagement portions at both ends for engaging with a tape pull-out mechanism on the device side, and an opening extending in an axial direction is provided on the main body from the side. A clamp member that is elastically fitted and clamps a tip portion of the magnetic tape between the main body and the main body, wherein a protrusion that fills the opening of the clamp member that is fitted to the main body has a ridge. A magnetic tape cartridge formed on an outer peripheral surface along an axial direction. 14. A magnetic tape cartridge in which a single reel on which a magnetic tape is wound is rotatably accommodated in a cartridge case, and a leader pin is attached to a tip end of the magnetic tape. When the magnetic tape cartridge is set in an external device, a main body having engagement portions at both ends to engage with a tape pull-out mechanism on the device side, and an annular leader tape attached to a front end portion of the magnetic tape include: A magnetic tape cartridge comprising: a clamp member that is elastically fitted to the main body from the side after being fitted to the main body, and clamps the leader tape between the main body and the main body. 15. A magnetic tape cartridge in which a single reel on which a magnetic tape is wound is rotatably housed in a cartridge case, and a leader pin is attached to a tip of the magnetic tape. A magnetic tape cartridge, wherein an annular heat-shrinkable leader tape is attached to the portion, and the leader tape is heated and fixed to the leader pin after being fitted to the leader pin. 16. A magnetic tape cartridge in which a single reel on which a magnetic tape is wound is rotatably housed in a cartridge case, and a leader pin is attached to a tip end of the magnetic tape. When the magnetic tape cartridge is set in an external device, a main body having engagement portions at both ends for engaging with a tape pull-out mechanism on the device side, and an opening extending in an axial direction is provided on the main body from the side. At least one of a magnetic tape engaging surface of the main body and a magnetic tape engaging surface of the clamp member. A magnetic tape cartridge characterized by having a rough surface formed thereon. 17. A magnetic tape cartridge in which a single reel on which a magnetic tape is wound is rotatably housed in a cartridge case, and a leader pin is attached to a tip end of the magnetic tape. When the magnetic tape cartridge is set in an external device, a main body having engagement portions at both ends for engaging with a tape pull-out mechanism on the device side, and an opening extending in an axial direction is provided on the main body from the side. A clamp member that is elastically fitted and clamps a tip portion of the magnetic tape between the main body and the main body; and a state in which the tip portion of the magnetic tape is folded back, between the main body and the clamp member. A magnetic tape cartridge characterized in that it is clamped on a magnetic tape cartridge. 18. A magnetic tape cartridge in which a single reel on which a magnetic tape is wound is rotatably accommodated in a cartridge case, and a leader pin is attached to a tip end of the magnetic tape. When the magnetic tape cartridge is set in an external device, a main body having engagement portions at both ends for engaging with a tape pull-out mechanism on the device side, and an opening extending in an axial direction is provided on the main body from the side. A clamp member which is elastically fitted and clamps a tip portion of the magnetic tape between the main body and the main body, wherein a flat portion is formed at at least one position on an outer peripheral surface of the clamp member. Magnetic tape cartridge.