JPH0427022Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic tape pressing pad that presses a magnetic tape as a magnetic recording medium against the magnetic tape sliding surface of a magnetic head.

[Prior Art] The above magnetic tape pressing pad (hereinafter abbreviated as pad) is used, for example, in a magnetic tape cassette. That is, in order to slide the magnetic tape onto the magnetic head in a cassette tape recorder, the IEC
According to the standard, the magnetic head is protruded 1.8 mm ± 0.5 mm from the position where the magnetic tape is stretched in a straight line, and the magnetic tape is held by the above-mentioned pad by the biasing force of the spring against the magnetic tape sliding surface of the magnetic head. It is designed to press and make pressure contact.

In this configuration, when the magnetic tape slides on the magnetic head and runs, a sliding load is applied to the magnetic tape drive mechanism due to the sliding friction between the magnetic tape and the magnetic head as well as the sliding friction between the magnetic tape and the pad. If this load is large, the power consumption of the magnetic tape drive mechanism increases accordingly. Therefore, in order to reduce this sliding load, a method has been adopted in which, for example, the entire surface of the magnetic tape on which the pad comes into pressure contact is back-coated with a material having a low coefficient of friction.

[Problems to be solved by the invention] However, the method of back-coating the magnetic tape with a material having a low coefficient of friction requires considerable cost. Further, in this method, the pressure of the magnetic tape against the magnetic tape sliding surface of the magnetic head does not change, and the problem arises that the magnetic tape sliding surface of the magnetic head is worn out in response to this pressing force. On the other hand, there is a problem in that simply lowering the pressure applied to the magnetic tape by the pad makes the pressure by the pad unstable and the sliding of the magnetic tape relative to the magnetic head unstable.

[Means for Solving the Problems] In order to solve these problems, the present invention provides a magnetic tape pressing pad that presses a magnetic tape as a magnetic recording medium against a magnetic tape sliding surface of a magnetic head. When looking at the pad along the width direction of the magnetic tape, a structure is adopted in which the rigidity of both end portions that protrude from both side edges of the magnetic tape and do not contact the magnetic tape is greater than that of the middle portion that contacts the magnetic tape.

[Operation] According to such a structure, due to the above-mentioned difference in rigidity, the pressing force of the pad is concentrated at both ends that do not contact the magnetic tape, and the pressing force at the middle portion that contacts the magnetic tape is reduced.

[Embodiments] Hereinafter, details of embodiments of the present invention will be described with reference to the attached drawings.

FIG. 1 shows the structure of the magnetic tape running system and the sliding running state of the magnetic tape in a magnetic tape cassette (hereinafter referred to as a cassette) in which a magnetic tape pressing pad (hereinafter also referred to as a pad) according to an embodiment of the present invention is used. The cassette 9 is shown in a partially broken state.

In the cassette 9 shown in FIG.
is wound around a supply reel and a take-up reel 4 (not shown), and the portion between the two reels is guided by guides 10 and 1.
1. It is guided via guide rollers 12 and 13, and is stretched in contact with the magnetic head 1, pinch roller 7, and capstan 8 of a cassette tape recorder inserted into the cassette 9.

Here, in order to slide the magnetic tape 3 on the magnetic tape sliding surface 1a of the magnetic head 1, as described above,
According to the IEC standard, the magnetic head 1 is inserted into the cassette 9 so as to protrude 1.8 mm±0.5 mm from the position where the magnetic tape 3 is stretched in a straight line.

In the cassette 9, the above-mentioned pad 6 is provided facing the magnetic head 1 and supported by a spring 5 for urging it, and the urging force of the spring 5 pushes the magnetic tape 3 towards the magnetic head 1.
The magnetic tape sliding surface 1a is pressed against the magnetic tape sliding surface 1a.

With this structure, the capstan 8, which has the magnetic tape 3 pressed against it by the pinch roller 7, is rotated in the direction of arrow b by a drive mechanism (not shown), thereby pulling the magnetic tape 3 in the direction of arrow a.
The magnetic tape is sent as shown in FIG. 1 and slides against the magnetic tape sliding surface 1a of the magnetic head 1, thereby magnetically recording or reproducing information. The sliding position of the magnetic tape 3 on the magnetic tape sliding surface 1a of the magnetic head 1 is regulated in a predetermined manner by tape guides 2, 2 attached to the magnetic head 1. Further, the take-up reel 4 is rotated in the direction of arrow c by a drive mechanism (not shown), and winds up the magnetic tape 3 that has been slid onto the magnetic head 1.

By the way, in the configuration shown in FIG. 1, when the magnetic tape 3 is sliding as described above, the sliding friction between the magnetic tape 3 and the magnetic head 1 as well as the sliding friction between the magnetic tape 3 and the pad 6 cause the magnetic tape 3 to slide on the drive mechanism. A load is applied, and when this load is large, the power consumption of the magnetic tape drive mechanism becomes large.

Therefore, in order to reduce the sliding load on the magnetic tape, the pad 6 of this embodiment has the following structure shown in FIGS. 2 and 3 in order to appropriately reduce the pressing force of the pad 6 against the magnetic tape 3. is adopted.

That is, FIG. 2 shows a front view of the pad 6 as viewed from the magnetic tape 3 side, and FIG. 3 shows a cross section of the pad 6 when the magnetic tape is pressed against the magnetic tape. In the pad 6 of this embodiment, when looking at the pad 6 along the width direction of the magnetic tape 3, both ends 6b, 6b shown with diagonal lines in the figure and the magnetic tape 3 protrude from both side edges of the magnetic tape 3 and do not contact the magnetic tape. The rigidity of the intermediate portion 6a shown as a satin finish in the figure which contacts the wafer is made to be different, and the rigidity of both end portions 6b, 6b is made greater than that of the intermediate portion 6a. The pad 6 is made of felt, rubber, or a polymeric material, and the difference in rigidity is between the middle part 6a and both ends 6b, 6b.
It is constructed by using materials with different rigidities, or by using the same material with different properties. For example, when the pad 6 is made of felt, the above-mentioned difference in rigidity is created by changing the thickness or density of the felt fibers in the intermediate portion 6a and both end portions 6b, 6b.

Based on this structure, the pad 6 presses and presses the magnetic tape 3 against the magnetic tape sliding surface 1a of the magnetic head 1 by the biasing force of the spring 5, as shown in FIG. As described above, in this case, the intermediate portion 6a contacts the magnetic tape 3, but both end portions 6b,
6b directly contacts and presses the magnetic tape sliding surface 1a without contacting it.

When the magnetic tape 3 is pressed, both ends 6b, 6b have greater rigidity due to the above-mentioned difference in rigidity.
is stretched to support the entire pad 6, and the pressing force of the pad 6 escapes from the middle portion 6a and is applied to both ends 6.
b, 6b, and the pressing force on the intermediate portion 6a is reduced compared to the case where the rigidity of the entire pad is uniform as in the conventional case. Experiments have shown that by making the rigidity of both ends 6b, 6b suitably greater than that of the middle part 6a, more than 30% of the pressing force of the entire pad 6, that is, the pressing force of the spring 5, can be applied to both ends 6b, 6b. become.

In this way, according to this embodiment, the pressing force of the pad 6 is concentrated on both ends 6b, 6b that do not contact the magnetic tape 3, and the pressing force on the intermediate portion 6a that contacts the magnetic tape 3 is reduced, so that the magnetic tape 3 The sliding load due to sliding friction between the pad 6 and the magnetic tape sliding surface 1a is reduced, and the power consumption of the drive mechanism for the magnetic tape 3 in the cassette tape recorder can be reduced.

Further, according to this embodiment, since the pressing force of the pad 6 on the magnetic tape 3 is appropriately reduced, the sliding wear on the tape sliding surface 1a of the magnetic head 1 can be reduced, and the durability of the magnetic head 1 can be improved. .

Furthermore, in this embodiment, even if the pressing force on the magnetic tape 3 is reduced, the pad 6 wraps around the entire magnetic tape 3 and can press the magnetic tape 3 uniformly and stably over its entire width. Stable sliding can be guaranteed.

[Effects of the invention] As is clear from the above description, according to the invention, in a magnetic tape pressing pad that presses a magnetic tape as a magnetic recording medium against the magnetic tape sliding surface of a magnetic head, the pad is magnetically pressed. As seen along the width of the tape, the rigidity of the ends that protrude from both sides of the magnetic tape and do not come into contact with the magnetic tape is greater than that of the middle part that comes into contact with the magnetic tape, reducing the sliding load on the magnetic head. The power consumption of the magnetic tape drive mechanism in a magnetic recording/reproducing device can be reduced, the sliding wear on the magnetic tape sliding surface of the magnetic head can be reduced, the durability of the magnetic head can be improved, and the magnetic tape can be stabilized appropriately and uniformly. Excellent effects such as being able to press the magnetic tape and ensuring stable sliding of the magnetic tape can be obtained.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the structure of the magnetic tape running system and the sliding running state of the magnetic tape in a magnetic tape cassette provided with a magnetic tape pressing pad according to an embodiment of the present invention, and FIG. FIG. 3 is a front view showing the structure of the pad according to the embodiment, and a partially cutaway sectional view of the periphery of the pad showing the state in which the magnetic tape is pressed against the pad. 1...Magnetic head, 2...Tape guide, 3...
...magnetic tape, 4...take-up reel, 5...spring, 6...pad, 6a...middle part, 6b...
...both ends, 7...pinch roller, 8...capstan, 9...cassette.

Claims (1)

[Scope of utility model registration request] In a magnetic tape pressing pad that presses a magnetic tape as a magnetic recording medium against the magnetic tape sliding surface of a magnetic head, the pad protrudes from both side edges of the magnetic tape and comes into contact with the magnetic tape when viewed along the width direction of the magnetic tape. 1. A pad for pressing a magnetic tape, characterized in that the rigidity of both end portions which are not in contact with the magnetic tape is greater than that of the middle portion that contacts the magnetic tape.