JPH0782732B2 - Cassette tape - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to an improvement in the structure of a head pad supporting device inside a cassette tape.

[Technical background of the invention and its problems] Conventionally, in a cassette tape used in a magnetic recording / reproducing apparatus, a head pad supported by a leaf spring is provided in order to maintain a stable contact state between the magnetic tape and the magnetic head. There is.

FIG. 2 is a perspective view of a conventional compact cassette, in which a head pad 1 is supported by a leaf spring 2 and arranged in a central opening 3 into which a recording / reproducing head is inserted. Further, the leaf spring 2 is inserted and installed between the primary guide pin 4a of the base half 4 and the leaf spring support pin 4b as shown in FIG. 3, and the leaf spring 2 is provided for each of the X, Y, Z axes. It has a maximum degree of freedom of 1 mm in the direction. Therefore, when the recording / reproducing head 5 is inserted through the central opening 3, the reproducibility of the relative positional relationship between the recording / reproducing head 5 and the head pad 1 is poor.

Therefore, the electromagnetic exchange gap 5a of the recording / reproducing head 5 is
The pressure force of the magnetic tape 6 received at the head pad 1
Since it fluctuates due to position changes in the X-axis and Z-axis directions of
It was difficult to maintain a stable contact state between the electromagnetic exchange gap 5a and the magnetic tape 6 when repeatedly recording and reproducing. Further, the change in the position of the head pad 1 in the X-axis and Z-axis directions is caused by fluctuations in the width direction of the magnetic tape 6 with respect to the running direction A of the magnetic tape 6 (periodic positional fluctuations in the Z-axis direction in the figure), and the same magnetic field. This causes a positional change in the width direction of the magnetic tape 6 with respect to the running direction A of the tape 6 (temporary positional change in the Z-axis direction in the figure), which adversely affects magnetic recording and reproduction.

In particular, in a so-called independent two-head type magnetic recording / reproducing apparatus in which the recording head and reproducing head are arranged independently, since the recording and reproducing electromagnetic conversion gaps are independent, the position change of the head pad 1 There is a problem that it is easily affected and it is difficult to perform stable magnetic recording and reproduction.

[Object of the Invention]

The present invention has been made in view of the above problems, and provides a head pad support device capable of reliably supporting a head pad with a simple structure and eliminating the position change in a magnetic recording / reproducing device. The purpose is to

〔Example〕

An embodiment of the cassette tape according to the present invention will be described below with reference to the drawings.

FIGS. 1 (a) and 1 (b) show the structure of an embodiment according to the present invention, and show the structure near the head pad of the cassette tape. 1 (a) is a sectional view taken along the line CC ', and FIG. 1 (b) is a partial plan sectional view. In both figures, the same parts as those in FIGS. 2 and 3 are designated by the same reference numerals. In the figure, the head pad 1 is bonded to the main surface of the gimbal leaf spring 7.
The gimbal leaf spring 7 is adhered to the shield plate 8 so that the semicircular cutout portion 7a fits into the protruding portion 8a of the shield plate 8. FIG. 1 (c) shows a connection state of the shield plate 8 and the gimbal leaf spring 7. The shield plate 8 is not only fitted in the groove (not shown) of the base half 4 as seen in the conventional compact cassette, but is also bonded and fixed after fitting in the groove of the base half 4. In such a structure, when the recording head 9 and the reproducing head 10 are inserted through the central opening 3 and the head pad 1 is pushed in the Y-axis positive direction via the magnetic tape 6, the gimbal leaf spring 7 opens the cutout 7a. It is displaced in the positive direction of the Y axis as a fixed point. The maximum displacement point in the positive direction of the Y-axis at this time is the center point 1a of the head pad 1, and the position change of the center point 1a in the X-axis direction and the Z-axis direction is only the amount of strain deformation of the gimbal leaf spring 7 in both axis directions. Becomes Therefore, the position change of the head pad 1 is suppressed to be extremely small as compared with the conventional head pad supporting device.

Next, regarding the twist of the gimbal leaf spring 7 with the X-axis and the Z-axis as rotation center axes, first, the gimbal leaf spring 7 is twisted about the X-axis, and the degree of twist at the gimbal leaf spring connection portion 7b is the largest. . Similarly, the twist is about the Z axis, and the degree of twist near the notch 7a is the largest. Regarding the twist about the Y axis, if the structure of the gimbal leaf spring 7 having a high rigidity is used, the twist degree is smaller than that of the other two axes. In this way, since the twist when each axis is the center of rotation is independent of each axis, the external force is absorbed as the twist in each direction. Therefore, the head pad 1 can maintain a stable contact state with the recording head 9 and the reproducing head 10. Further, the maximum displacement point of the head pad 1 in the positive direction of the Y-axis is the center point 1a of the head pad 1 as described above.
Therefore, although the gimbal leaf spring is fixed at the two cutouts 7a, a large amount of displacement in the Y-axis positive direction can be obtained.

〔The invention's effect〕

As described in detail above, according to the present invention, the gimbal mechanism is adopted as the structure of the leaf spring for supporting the head pad, so that the head pad can be supported reliably and stably.

[Brief description of drawings]

1 (a) and 1 (b) show the construction of an embodiment of the cassette tape according to the present invention, in which FIG. 1 (a) is a sectional view, FIG. 1 (b) is a partial plan sectional view, and FIG. (C) is a perspective view of a shield plate and a gimbal leaf spring, FIG. 2 is a perspective view of a conventional cassette tape, and FIG. 3 is a partial plan sectional view of a conventional cassette tape. In the figure, 1 ... Head pad, 2 ... Leaf spring 4 ... Base half, 7 ... Gimbal leaf spring

Claims (1)

[Claims] 1. A cassette tape containing a magnetic tape wound inside, wherein a part of the gimbal leaf spring is provided such that rotation center axes of the gimbal leaf spring are provided in a tape running direction and a tape width direction, respectively. Is fixed in the cassette tape, a head pad is arranged on the main surface of the gimbal leaf spring, and the gimbal leaf spring is placed so that the head pad is located on the opposite side of the magnetic head with the magnetic tape interposed therebetween. A cassette tape characterized by being arranged.