JPH0222875Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic tape cartridge which improves the running accuracy of the magnetic tape relative to the recording/reproducing head and prevents azimuth loss and track positional deviation from occurring.

In the conventional apparatus shown in FIG. 1, the magnetic tape runs while sliding on guide pins 1, 1, and is pressed against a pad 3 in the center of a tape pad holding plate 2 by a reproducing head. At this time, the tape pad holding plate 2, which is an elastic body made of a leaf spring or the like, is recessed in the center using both legs 4a, 4a of the U-shaped magnetic shielding plate 4 as fulcrums.

This conventional example has a drawback in that the magnetic tape cannot be run parallel to the reproducing head unless the guide pins 1, 1 are erected vertically with respect to the base surface.

Therefore, instead of the guide pins 1, 1, it has been proposed that the tape pad holding plate itself be provided with this magnetic tape sliding guide function.

That is, guide protrusions having guide surfaces on which the magnetic tape slides are formed on both sides of the tape pad holding plate so as to protrude forward.

Then, the concave portions on the back surface of the guide protrusion were fitted into the legs 4a, 4a of the magnetic shielding plate 4, so that the tape pad holding plate was engaged with the magnetic shielding plate 4.

In such a conventional device, it is true that the running accuracy of the magnetic tape is improved compared to the conventional example shown in FIG. A new drawback has arisen: it digs in and doesn't come back. In addition, with this device, there is a possibility that the pad pressure may vary depending on the amount of biting described above.

The present invention was developed in view of the above background, and while taking advantage of the effect of forming a magnetic tape guide surface on the tape pad holding plate itself, it also prevents the recesses on the back surface of the guide protrusion from biting into the magnetic shielding plate. The purpose is to eliminate the problem.

To achieve this purpose, the present invention consists of a magnetic shielding plate having a U-shaped planar shape, an elastic body placed in front of both legs of the magnetic shielding plate, and having a tape pad fixed to the center of the front surface. The present invention is directed to a magnetic tape cartridge equipped with a tape pad holding plate formed by protruding forwardly a guide protrusion having guide surfaces on both sides of which the magnetic tape slides.

A guide protrusion of the tape pad holding plate is provided inside both legs of the magnetic shielding plate, that is, on the tape pad side, and a pin that engages with the guide protrusion is provided upright on the tape guide side further than both guide protrusions. The present invention is characterized in that engaging portions for engaging magnetic shielding plates are formed at both ends of the tape pad holding plate.

The configuration of the present invention will be explained below based on the illustrated embodiments. Note that the same parts as in the conventional example shown in FIG. 1 are given the same reference numerals.

FIG. 2 is a simplified plan view of the main parts of the magnetic tape cartridge according to the first embodiment.

The tape pad holding plate 5 composed of a leaf spring has the tape pad 3 in the center, and on both sides thereof, guide protrusions 7 having guide surfaces 6 on which the magnetic tape slides are formed to protrude forward. ing.

The amount of protrusion of the guide protrusion 7 is set so that the guide surface 6 is at the same position as the conventional guide pin after the reproduction head is inserted. In the device of this embodiment, the conventional guide pins 1, 1 are placed slightly closer to the inside than in the conventional device to support the tape pad holding plate 5 as a guide.

Reference numeral 8 denotes an engaging portion which is the main part of the present invention.

The engaging portions 8 are formed at both ends of the guide protrusion 7 on the tape pad holding plate 5 further outward. Tip surface 4
(b) It is formed by bending both ends so as to come into contact with the outer surface 4c. Therefore, the guide protrusion 7 is located inside the leg 4a, and the recess on the back surface of the guide protrusion 7 does not fit into the leg 4a.

FIG. 3 is a plan view showing the reproduction head 9 inserted into this apparatus. The magnetic tape 10 is pressed against the tape pad 3 and is in sliding contact with the guide surface 6. The tape pad holding plate 5 is
Although it bends toward the center using both engaging portions 6 as fulcrums, as described above, no biting occurs between it and the legs 4a of the magnetic shielding plate 4.

When such a guide protrusion 7 is provided on the tape pad holding plate 5, the playback head 9 can be moved as shown in FIG.
However, even if it is inserted at an angle, the tape pad holding plate 5 will follow the inclination of the playback head 9, that is, the inclination of its end face, so that the end face of the playback head 9 and the guide surface 6 will always be in a parallel state. Hold.

FIG. 5 is a simplified plan view of the second embodiment.

In this embodiment, the engaging portion 8 is shown in FIGS.
As shown in the figure, it is formed as a protrusion whose width is narrower than the width of the tape pad holding plate 5. This protrusion 8 is inserted from the inside into the locking hole 4d formed in the leg 4a as shown in FIG. 8, and the magnetic shielding plate 4 and tape pad holding plate 5 are engaged as shown in FIG. be. Incidentally, FIG. 6 shows an example in which the width of the tape pad 3 is wider than the tape pad holding plate 5, and conversely, FIG. 7 shows an example in which the tape pad holding plate 5 is wider.

In this case, the width of the guide protrusion 7 of the tape pad holding plate 5 is preferably approximately the same width as the magnetic tape or larger so as not to damage the magnetic tape when guiding the magnetic tape.

In any of these embodiments, the elasticity of the tape pad holding plate 5 acts effectively so that the magnetic tape 10 is not damaged.

As described above, the present invention has a guide protrusion that slides and guides the magnetic tape on the tape pad holding plate itself, which not only improves the running accuracy of the magnetic tape, but also allows the concave part on the back of the guide protrusion to form a part of the magnetic shielding plate. Since the tape pad holding plate and the magnetic shielding plate are engaged to prevent the magnetic tape from getting stuck in the legs, the elasticity of the tape pad holding plate can be effectively utilized, and therefore the magnetic tape will not be damaged. Furthermore, since a pin is installed upright on the tape pad side of the guide protrusion, the pin functions as a stopper to prevent excessive movement of the tape pad holding plate, so that the contact between the magnetic tape and the magnetic head is always maintained properly. We are able to provide magnetic tape cartridges of excellent quality.

[Brief explanation of the drawing]

FIG. 1 is a simplified plan view of a magnetic tape cartridge according to a conventional example, FIG. 2 is a simplified plan view of a magnetic tape cartridge according to an embodiment of the present invention, FIG. 3 is a diagram of the same operating state, and FIG. 4 5 is a simplified plan view of a magnetic tape cartridge according to another embodiment, and FIGS. 6 and 7 are front views showing tape pad holding plates having different widths. 8 are side views showing the legs of the magnetic shielding plate. 1... Guide pin, 3... Tape pad, 4...
...magnetic shielding plate, 4a...leg, 4d...locking hole, 5...
Tape pad holding plate, 6... guide surface, 7... guide protrusion, 8... engaging portion.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Consisting of a magnetic shielding plate with a U-shaped planar shape and an elastic body placed in front of both legs of the magnetic shielding plate and having a tape pad fixed to the center of the front surface. , a magnetic tape cartridge comprising a tape pad holding plate formed by protruding forward guide protrusions having guide surfaces on both sides of which the magnetic tape slides, the guide protrusions of the tape pad holding plate being in contact with the magnetic shielding plate; A pin is provided closer to the tape pad than both legs, and a pin that engages with the guide protrusion is provided upright on the tape pad side further than both guide protrusions, and an engagement portion with the magnetic shielding plate is formed at both ends of the tape pad holding plate. A magnetic tape cartridge characterized by: (2) In claim (1) of the utility model registration claim, the engaging portion is formed by bending the tape pad holding plate so as to come into contact with the tip end surface and outer surface of both legs of the magnetic shielding plate. A magnetic tape cartridge characterized by: (3) In the utility model registration claim (1), the engaging portion includes narrow projections on both ends of the tape pad retaining plate for insertion into locking holes formed in both legs of the magnetic shielding plate. What is claimed is: 1. A magnetic tape cartridge characterized in that it is configured by forming a section.