JPS6323825Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a tape cassette in a magnetic recording/reproducing device for recording and reproducing audio/video signals.

Conventional configuration and its problems In recent years, increasing density has become a major issue in magnetic recording technology. Particularly in VTRs, which are typically used for recording video signals, there are demands for long-duration recording and miniaturization of the device, and technical studies have been conducted to meet these demands, including narrower tracks and narrower gaps in the magnetic head. being pursued.

However, the current mainstream of magnetic recording is the so-called in-plane magnetization method in which magnetization is formed parallel to the surface of the recording medium. The formation of a rotating magnetization mode in which the magnetization vector rotates and the reproduction output decreases occurs, which hinders high density. Therefore, a recording method (Japanese Unexamined Patent Publication No. 1983-32009) that enables higher density than conventional in-plane magnetization has been proposed and is currently being experimentally investigated in various fields.

An overview of the recording method will be explained using FIG. A recording medium 1 (hereinafter referred to as a magnetic tape) includes a resin film 2 such as a polyester film, and a magnetic tape such as Co, which has a so-called perpendicular easy axis of magnetization rotated approximately 90 degrees from the conventional one.
- a magnetic layer 3 such as a Cr alloy film.

Magnetization of the magnetic tape 1 is performed as follows. First, the main magnetic pole 4, which is a thin film made of a high magnetic permeability material, is in contact with the magnetic layer 3 of the magnetic tape 1, and performs relative motion as the magnetic tape 1 runs (arrow). A winding 6 for applying a signal current is provided to an auxiliary magnetic pole 5 made of a high magnetic permeability material and disposed opposite to the main magnetic pole 4 with the magnetic tape 1 in between.

When a signal current such as audio or video is applied to the winding 6, magnetic flux flows within the auxiliary magnetic pole 5.
At this time, since the magnetic flux has the property of moving toward a material with high magnetic permeability, the magnetic flux emitted from one end face of the auxiliary magnetic pole 5 follows the flow shown by the broken line, which is absorbed by the main magnetic pole 4 facing the auxiliary magnetic pole 5. Form. Therefore, in the magnetic layer 3, due to the property of the perpendicular easy axis of magnetization, magnetization remains perpendicular to the film surface and opposite to the end face (magnetic tape side) of the main magnetic pole 4 as shown by the arrow.

In addition, during reproduction, the residual magnetization of the magnetic layer 3 excites the main magnetic pole 4 due to a phenomenon opposite to the above, and the leakage magnetic flux passes through the auxiliary magnetic pole 5, resulting in a voltage generated in the winding 6 according to the magnetic flux. It is done by doing.

It has been variously reported that in this recording method, the magnetization transition becomes abrupt as the density increases, and that it is possible to increase the density compared to conventional in-plane magnetization.

One of the problems when applying this recording method to conventional magnetic recording devices is that the main magnetic pole 4 and the auxiliary magnetic pole 5
Since it is necessary to reduce the gap to several hundred microns or less in order to obtain recording/reproducing characteristics, a means for inserting the magnetic tape 1 into the gap is required.

As a method for easily inserting the magnetic tape 1 into the gap, a configuration as shown in FIG. 2 has been proposed. To explain the outline, either an R-shaped part 7 is provided on the magnetic tape 1' insertion side of the main magnetic pole 4' and auxiliary magnetic pole 5', or a dogleg-shaped part is provided in a part of both magnetic poles 4' and 5'. FIG. 2b shows the guide plate 8 provided.

The above proposal is preferable as a simple structure when the rigidity of the magnetic tape 1' is high, but as the magnetic tape 1' has become thinner in order to achieve higher density in recent years, the rigidity decreases and a slight If a pinching or bending force occurs, the magnetic tape 1' tends to bend and become difficult to insert.

Furthermore, in thin magnetic tapes, curling occurs due to bending stress in the width direction during the manufacturing process and long-term storage. This curling phenomenon is also undesirable because it hinders the insertion operation into a minute gap, but it cannot be completely prevented, so the proposal shown in FIG. 2 cannot provide a sufficient insertion means.

FIG. 3 shows a conventional tape cassette in which an auxiliary magnetic pole 5' is provided within a cassette housing 9'.
Note that either the main magnetic pole 4' or the auxiliary magnetic pole 5' may be installed in the cassette housing 9'.
In this configuration, one magnetic pole located outside the cassette housing 9'(4' in the figure) may be linked to the operating mode of the device (not shown), but the cassette housing 9' and its user The reliability of the built-in magnetic pole 5' (or 4') may vary depending on how the user handles it (misalignment of the mounting position, falling off, etc.)
I feel uneasy about it. Furthermore, since a place is required to mount the magnetic poles themselves, there are problems such as the cassette housing tends to become large, and some of them are not suitable for miniaturization of positions as the density increases.

OBJECT OF THE INVENTION The object of the present invention is to provide a tape cassette containing a magnetic tape, in which a magnetic tape can be easily inserted into opposing magnetic poles, especially for perpendicular recording.

Structure of the Invention In order to achieve the above object, the present invention provides a magnetic tape that is provided along a magnetic tape within a cassette casing and changes into an arcuate shape due to compressive strain generated in conjunction with the mounting operation of the cassette casing on a cassette holder. However, it is equipped with a band-shaped elastic body that pushes the magnetic tape built into the cassette casing to the outside of the cassette casing, and even if the opposing magnetic poles are located outside the cassette casing, the magnetic tape between the opposing magnetic poles is not transmitted. This has the effect of making it easier to insert the tape.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on the drawings. In FIG. 4, a pair of reels 10 and 1 wind a magnetic tape 1 built into a cassette housing 9.
0', a pair of guide posts 11 and 11' that regulate the magnetic tape 1, a fixing pin 12 that stands up on the cassette housing 9, and a sliding hole that fits into the slide holes 13 and 13' provided on the cassette housing 9. A movable slide pin 14 is located between the fixed pin 12 and the slide pin 14, and has an elastic body with each end bent into a ring shape and fitted onto the fixed pin 12 and the slide pin 14, respectively. . The magnetic tape 1 is attached to the elastic body 15.
An opening 16 wider than the width of the opening 16 is provided.

FIG. 5 shows the slide pin 14 and the slide hole 1.
3 and 13', the elastic body 15, and the cassette housing 9. FIG. 5a shows the structure of the slide pin 14 and the cassette housing 9. The slide pin 14 has three different diameters, and the elastic body 15 fits into the smallest diameter portion of the slide pin 14. The thickness A of the intermediate diameter portion of the slide pin 14 is made slightly larger than the exterior thickness B of the cassette housing 9, and is configured to be slightly smaller than the width of the slide hole 13 of the cassette housing 9. is fitted. Note that the joint surface 17 of one flange portion 14' of the slide pin 14 can be formed by means such as adhesion or screw fitting.

FIG. 5 shows the fitting of the elastic body 15 and the slide pin 14. The elastic body 15 is bent into a ring shape with an inner diameter slightly larger than the diameter C of the smallest diameter part of the slide pin 14. Can be rotated freely.

The same applies to the fixing pin 12 and elastic body 15 shown in FIG.

FIG. 6 shows the movement of the cassette housing 9 constructed as shown in FIGS. 4 and 5 when it is inserted into the cassette holder 18 of the apparatus.

As the cassette housing 19 is inserted into the cassette holder 18, the maximum diameter portion of the slide pin 14 is inserted into the locking portions 19, 1 disposed within the cassette holder 18.
9' (cassette case 9 position A). Thereafter, when the insertion is continued (position B), the slide pin 14 moves along the slide holes 13, 13' shown in FIG. In parallel with this, the elastic body 15 is compressed in the longitudinal direction, but since it rotates relative to the fixed pin 12 and slide pin 14, it deforms into an arc shape as shown in FIG. Push it out from the cassette housing 9. Thereafter, when the cassette case 9 is pushed down, the cassette holder 18 rotates around the fulcrum 20 and the cassette case 9 is set in the device 21.

Inside the device, the aforementioned main magnetic pole 4 and auxiliary magnetic pole 5 are arranged with a wide gap, and the cassette case 9
The elastic body 15 and the magnetic tape 1 pushed out by the elastic body 15 form the main magnetic pole 4 and the auxiliary magnetic pole 5.
be interposed between. The elastic body 15 at this point
and the shape and dimensions of the main magnetic pole 4 and the magnetic tape 1.
This will be explained with reference to Figures b and c. Opening 16 of elastic body 15
Since the width GW is larger than the width Tw of the magnetic tape 1, the magnetic tape 1 enters the opening 16, and as shown in FIG.
Since the magnetic tape 1 has a curved shape, the magnetic tape 1 is stretched around the abutting edge 21 as a fulcrum within the curved opening 16 of the elastic body 15 without being damaged. In addition to regulating the width of the magnetic tape 1, the opening 16 also serves as an insertion opening for the main magnetic pole 4. Further, the height Hw of the main magnetic pole 4 is set larger than the width Tw of the magnetic tape 1.

From this state, when the device is operated in the recording/reproducing mode (not shown), the main magnetic pole 4 moves from the chain line position to the solid line position as shown in FIG. 8, passes through the opening 16, and the winding 6 is applied. It operates so as to make the gap between the auxiliary magnetic pole 5 and the auxiliary magnetic pole 5 a predetermined dimension δ.

In addition, in the above embodiment, the cassette housing 9
When taking out the magnetic tape 1, at least one of the pair of reels is rotated when the cassette holder 18 is opened to take up any slack in the magnetic tape 1. In addition, as shown in FIG. If it is also used as a fixing pin in the cassette case 9, when the cassette case 9 is removed, the slide pin 14'' returns to its original position due to the restoring force of the elastic body 15, and the loosening of the magnetic tape 1 can be automatically eliminated. A method such as this can be considered. According to this configuration, the number of parts can be reduced and the device can be simplified.

Effects of the invention As described above, according to the invention, the cassette housing has
The device itself is simplified by providing a band-shaped elastic body that generates compressive strain and deforms into an arc shape in conjunction with the mounting operation of the cassette housing on the cassette holder, pushing the magnetic tape out of the cassette housing. It is possible to reduce the manufacturing cost of the device, or it can be moved to a position where it can be inserted into the gap where the magnetic poles are widened during perpendicular recording, which is a high-density recording method, and it is possible to insert the thinner magnetic tape into the gap. can be done easily. Furthermore, since each magnetic pole can be attached and adjusted within the device, the reliability of the device is improved. Further, when downsizing the casing, since conventionally only a thin band-shaped elastic body is incorporated into the cassette, this does not pose much of a problem and has great practical effects.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of the conventional perpendicular recording principle, Figure 2
Figure 3 is a schematic diagram of a proposal for conventional perpendicular recording, Figure 4 is a perspective view of the overall configuration of a tape cassette in an embodiment of the present invention, Figure 5 is a partial configuration diagram thereof, and Figure 6 is a tape cassette. Installation state diagram, No. 7
Figures a to c, Figures 8 and 9 are explanatory diagrams of tape cassette operation. DESCRIPTION OF SYMBOLS 1...Magnetic tape, 4...Main magnetic pole, 5...Auxiliary magnetic pole, 9...Cassette housing, 10, 10'...Reel, 12...Fixing pin, 13, 13'...Slide hole, 14... ...Slide pin, 15...Elastic body, 16...Opening, 18...Cassette holder.

Claims (1)

[Scope of utility model registration request] A tape cassette containing a pair of reels wound with magnetic tape, which is provided along the magnetic tape inside the cassette housing, and is compressive strain generated in conjunction with the mounting operation of the cassette housing on the cassette holder. What is claimed is: 1. A tape cassette comprising a band-shaped elastic body that deforms into an arc shape and pushes out a magnetic tape housed in the cassette casing to the outside of the cassette cassette.