JPH0316130Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> The invention is a method for recording or reproducing a predetermined information signal by slidingly contacting a magnetic sheet formed in the shape of, for example, a disk and a magnetic head. In particular, in order to obtain a good sliding contact between the magnetic sheet and the magnetic head, the magnetic recording and/or reproducing device is arranged at a position facing the magnetic head through the magnetic sheet, and the magnetic sheet is exposed to air. The present invention relates to a magnetic recording and/or reproducing device comprising a sheet pad that is pressed against a magnetic head through a flow.

<Background technology and its problems> Conventionally, as a magnetic recording and/or reproducing device using a flexible magnetic sheet as a recording medium, a disk-shaped magnetic sheet is rotated, and this magnetic sheet and a magnetic head are slid together. A device in which information signals are recorded or reproduced by contacting the device has been put into practical use.

The present applicant has made various proposals regarding magnetic recording devices, so-called electronic cameras, which record imaging signals of still images on such magnetic sheets.

This electronic camera uses a magnetic head to record image signals obtained by the image pickup tube or solid-state image sensor on the magnetic sheet, and the magnetic sheet is connected to the image pickup tube or solid-state image sensor. Corresponding to the operation, the magnetic head is rotated at high speed and is brought into sliding contact with the signal recording surface of the magnetic sheet, and by supplying the imaging signal to the magnetic head, the imaging signal is recorded on the recording track of the magnetic sheet. It is designed to perform magnetic recording of signals.

In addition, in such electronic cameras, the magnetic sheet is now rotatably housed in a magnetic sheet jacket in order to protect the signal recording surface and to facilitate storage and use. The magnetic sheet is housed in the magnetic sheet jacket and attached to the electronic camera, and the magnetic head provided in the electronic camera enters through the window provided in the magnetic sheet jacket and slides onto the signal recording surface. The above-mentioned magnetic recording of the imaging signal is now performed.

Further, the magnetic sheet is provided with a center core having a fitting hole in the axial center portion and having a magnetic material arranged thereon. When the magnetic sheet is attached to the electronic camera, the rotary spindle provided on the electronic camera is fitted into the fitting hole, thereby positioning the magnetic sheet, and is placed on a rotary table that rotates integrally with the rotary spindle. It is fixed by the attraction force of the magnet placed here, and is driven to rotate as the rotary table rotates. Note that this magnet has a relatively small magnetic force that does not affect magnetic recording on the magnetic sheet.

The magnetic head is intermittently moved in the radial direction of the rotating magnetic sheet to perform magnetic recording by sequentially forming concentric recording tracks on the signal recording surface of the magnetic sheet. .

By the way, in order to obtain a good recording state in a magnetic recording device such as an electronic camera as described above, it is necessary to keep the magnetic sheet and the magnetic head in appropriate sliding contact at all times. However, since the magnetic sheet is rotated at high speed and is flexible, it is difficult to obtain a suitable sliding contact pressure simply by pressing the magnetic head against it with a predetermined pressure. In addition, some of the magnetic sheets mentioned above are formed with fine irregularities during manufacture, and it is difficult to obtain stable sliding contact with the magnetic head in such magnetic sheets. It also becomes more difficult.

Conventionally, such magnetic recording apparatuses are provided with a sheet pad that faces the magnetic head via the magnetic sheet and presses the magnetic sheet toward the magnetic head. For example, the electronic camera described above has a substantially flat sheet pressing surface, and a protrusion of the magnetic head along the moving direction of the magnetic head is provided at a central portion of the sheet pressing surface that faces the magnetic head. A seat pad made of a metal material is provided with a substantially U-shaped groove corresponding to the shape of the seat pad. In this seat pad,
As the magnetic sheet rotates at high speed, an air flow generated on the surface of the magnetic sheet due to the viscosity of the air is interposed between the sheet pad and the magnetic sheet, and the pressure of this air flow causes the magnetic sheet to be while pressing the magnetic head toward the magnetic head, and allowing the protruding portions of the magnetic head and the magnetic sheet that are pressed by the magnetic head to escape into the groove portion;
Good sliding contact between the magnetic sheet and the magnetic head is achieved.

However, in such a seat pad, although the airflow can be suitably compressed and a high pressure can be obtained in the part where the magnetic sheet enters, the airflow compressed in this entry part is The pressure is diffused and reduced in the groove, and this groove gradually becomes negative pressure, and this negative pressure causes the magnetic sheet to be drawn into the groove. This has the disadvantage of reducing the sliding contact pressure. Additionally, once the airflow is diffused and depressurized within the groove, the depressurized state of the airflow in the groove also affects the compressive action of the airflow in the portion of the seat pad where the magnetic sheet exits. At this outlet, the air flow cannot be restored to the favorable compression state obtained at the inlet, and no high pressure can be obtained at this outlet. Therefore, at this exit portion, friction occurs between the sheet pad and the magnetic sheet, and this frictional force acts as a rotational load on the magnetic sheet, impeding smooth rotation of the magnetic sheet. In particular, in the case of an electronic camera as described above, in which the magnetic sheet is rotated while being attracted and fixed by a magnet with a relatively weak magnetic force, the rotation of the magnetic sheet is caused by the rotational load. There is a risk that the speed will be disturbed.

Furthermore, when a local frictional force is applied to the magnetic sheet as described above, this frictional force causes minute vibrations in the magnetic sheet, and this vibration causes the magnetic head and the magnetic sheet to There is also a risk that the sliding contact state will be disturbed, leading to deterioration of the magnetic recording state.

Therefore, the drawbacks of providing a seat pad in which only grooves are formed on a flat sheet pressing surface can be overcome by providing a seat pad 1 as shown in FIGS. 1 and 2. In FIG. 1, the magnetic sheet 2 is rotatably housed in a sheet jacket 3 and attached to an electronic camera (not shown), and the center core 4 provided on the magnetic sheet 2 is attached to the electronic camera (not shown). It fits into the rotating spindle 5 and is fixed to the rotating table 6 by suction. Accordingly, the magnetic sheet 2 is rotationally driven in the direction of the arrow A in FIG. 1 as the rotating spindle 5 and rotating table 6 rotate. Furthermore, windows 7 and 8 extending from at least the outermost recording track to the innermost recording track of the magnetic sheet 2 are formed in the opposite sides of both sides of the sheet jacket 3, respectively. The magnetic head 9 protrudes through the window 7 and comes into sliding contact with the magnetic sheet 2, while the sheet pad 1 protrudes through the other window 8 and presses the magnetic sheet 2 toward the magnetic head 9. ing. The sheet pad 1 has a relief part in which the magnetic head 9 protrudes from the outermost recording track to the innermost recording track of the magnetic sheet 2, where the magnetic head 9 moves. A recess 10 is provided. The recess 10 has a depth that is sufficiently greater than the amount of protrusion of the magnetic head 9, and can easily take in the atmosphere from, for example, the atmosphere communication portions facing both sides of the seat pad 1.

Further, the magnetic head 9 of the recess 10 of the seat pad 1 is narrowed, and the magnetic sheet 2 is gradually approached in the advancing direction of the magnetic sheet 2 which has been pressed by the magnetic head 9 and curved and deformed. A first inclined surface 11 is provided which is inclined so as to be inclined. Then, the magnetic head 9 in the concave portion 10 of the sheet pad 1 is narrowed to open the magnetic sheet 2.
A second inclined surface 12 is provided at the exit portion of the magnetic sheet 12, which is continuous with the recessed portion 10 and gradually approaches the curved magnetic sheet 2 in the traveling direction thereof.
In this seat pad 1, as the magnetic sheet 2 rotates, the air flow generated on the surface of the magnetic sheet 2 is gradually compressed by the first inclined surface 11, and the magnetic sheet 2 and the inclined surface 11 have a High pressure is generated at the close portion, pressing the magnetic sheet 2 toward the magnetic head 9. Further, the airflow compressed on the first inclined surface 11 reaches the recess 10 and is reduced to atmospheric pressure. In this way, the interior of the recess 10 is always kept at atmospheric pressure. Furthermore, the airflow that has returned to atmospheric pressure in the recess 10 is gradually compressed at the second inclined surface 12, and becomes high pressure again at the portion where the second inclined surface 12 and the magnetic sheet 2 are very close to each other. The magnetic sheet 2 is pressed against the magnetic head 9 side. In this manner, in the seat pad 1, the magnetic head 9 of the magnetic sheet 2 is narrowed to press the entry and exit portions with a suitable pressure through the air flow, and atmospheric pressure is created in the recess 10. Thus, the magnetic sheet 2 can be smoothly rotated, and the magnetic sheet 2 and the magnetic head 9 can be in a suitable sliding contact state.

In the seat pad 1, an auxiliary recess 13 and an auxiliary slope 14 are provided continuously to the second slope 12, and the auxiliary recess 13 returns the air flow to atmospheric pressure, and the auxiliary slope It is gradually compressed on the surface 14, and the magnetic sheet 2 is compressed by the pressure.
The magnetic sheet 2 is pressed in a well-balanced manner by the entire sheet pad 1.

By the way, when the sheet pad 1 as described above is provided, the magnetic sheet 2 is pressed between the entrance part and the exit part while sandwiching the magnetic head 9, so that the magnetic sheet 2 is pressed between the entrance part and the exit part. The magnetic sheet 2 can be reliably pressed in a well-balanced manner along the tangential direction. However, since no pressing force is applied to the magnetic sheet 2 on either side of the magnetic head 9 in the radial direction, the state of sliding contact between the magnetic sheet 2 and the magnetic head 9 is limited to the radial direction of the magnetic sheet 2. Becomes unstable. In particular, the magnetic sheet 2 described above is fixed at its radial axis side to the rotary table 6 via the center core 4 provided here, and at the same time its radially outer peripheral side is placed in a state where it can be freely bent as a free end. ing. Therefore,
When the middle part of the magnetic sheet 2 in the radial direction is pressed by the magnetic head 9, the outer peripheral part of the magnetic sheet 2 is displaced in the thickness direction around the center core 4, and the magnetic head 9 presses the outer peripheral part of the magnetic sheet 2. It floats in the direction of the pressure. As a result, the magnetic sheet 2 comes into sliding contact with the magnetic head 9 in a radially inclined state, and for example, a suitable magnetic recording state cannot be obtained for the magnetic sheet 2 that is distorted in the radial direction. There are drawbacks, and furthermore, there are drawbacks such as hindering the realization of high-density recording in such electronic cameras and the like.

<Purpose of the invention> Therefore, in view of the above-mentioned circumstances, the present invention has been devised to create a seat pad that can maintain smooth running of the magnetic sheet and realize extremely good sliding contact between the magnetic sheet and the magnetic head. It is an object of the present invention to provide a magnetic recording and/or reproducing apparatus that can improve the quality and density of magnetic recording or reproducing on the magnetic sheet.

<Means for Achieving the Object> In order to achieve the above-mentioned object, the magnetic recording and/or reproducing device according to the present invention includes a sheet pad that faces a magnetic head via a magnetic sheet, and the sheet pad has a , a relief portion for protruding the magnetic head is provided in a portion facing the magnetic head, and is provided at a substantially intermediate position between both sides of the relief portion extending in the radial direction of the magnetic sheet from a side where the magnetic sheet enters the magnetic head. A first inclined surface portion that gradually approaches the magnetic sheet is provided in the extending portion, and further extends from a substantially intermediate position of the both sides toward the exit portion side of the magnetic sheet with respect to the magnetic head. A second inclined surface portion is provided which once moves away from the magnetic sheet in a direction and then gradually approaches the magnetic sheet again.

<Examples> The present invention will be described in detail below with reference to drawings showing specific examples.

In this embodiment, the present invention is configured as an electronic camera for capturing still images. In this electronic camera, an imaging signal of a subject obtained from, for example, an image pickup tube is supplied to a magnetic head 16 that is in sliding contact with a magnetic sheet 15 as shown in FIG.
magnetic recording is performed on the signal recording surface of the
As shown in FIG. 4, the magnetic sheet 15 is formed into a disk shape, and a fitting hole 18 having a leaf spring portion 17 fixed at both ends is formed in the axial center of the disk, and an annular magnetic body (not shown) is formed in the magnetic sheet 15. ) has a center core 19 attached. This magnetic sheet 1
6 is mounted on an electronic camera while being rotatably housed in a substantially rectangular sheet jacket 20 around the center core 19, and in this device state, the fitting hole 18 is connected to the chassis 21 of the electronic camera.
The above-mentioned magnetic material is placed on a rotary table 23 that fits into a rotating spindle 22 provided on the rotary spindle 22 and rotates integrally with the rotary spindle 22, and is mounted on a rotary table 23 that rotates integrally with the rotating spindle 22. is attracted and fixed to this rotary table 23.
The magnetic sheet 16 mounted in this manner is rotated at a high speed of 1/60 second or 1/30 second per rotation, corresponding to the imaging speed of the image pickup tube, by the rotation of the rotating spindle 22 and the rotating table 23. It is rotated in the direction of arrow B in the figure. Note that the permanent magnet provided on the rotary table 23 is
It has the minimum magnetic force to attract and fix the magnetic sheet 16 without affecting the magnetic recording in the magnetic sheet 16, and thereby the signal can be transmitted to a position near the center core 19. It can be used as a recording surface, and the diameter of the magnetic sheet 16 can be reduced.

Further, when recording on the magnetic sheet 16, the magnetic head 15 is caused to protrude toward the magnetic sheet 16 by a drive mechanism 24, and is exposed to the signal recording surface of the magnetic sheet 16 through the window 25 of the sheet jacket 20. It is driven to come into sliding contact with the
Each time the magnetic sheet 16 rotates once, the magnetic sheet 16 is intermittently fed in the radial direction and driven to perform magnetic recording in sequence. In this manner, the magnetic head 15 records the imaging signal so as to form concentric recording tracks on the magnetic sheet 16.

Further, a sheet pad 26 is arranged at a position facing the magnetic head 15 with the magnetic sheet 16 interposed therebetween. This seat pad 26 is made of a metal material, for example, and is attached to the support arm 2.
8, facing the magnetic sheet 16 through the window 27 of the sheet jacket 20, and connected to the drive mechanism 2 via the support arm 28.
4, the magnetic sheet 16 is driven in synchronization with the magnetic head 15, and is intermittently fed in the radial direction of the magnetic sheet 16 while maintaining a state facing the magnetic head 15. This seat pad 26 is shown in FIGS.
As shown in the figure, a through hole 29 is formed in a portion facing the magnetic head 15 to serve as a relief for the magnetic head 15 to protrude. This through hole 2
9 is continuous with a window 30 formed in the support arm 28, and is communicated with the atmosphere through this window 30, and from which the surface of the magnetic sheet 16 opposite to the signal recording surface can be visually observed. It is becoming possible to do so.

On the side of the sheet pad 26 facing the magnetic sheet 16, both sides 35, 36 of the through hole 29 extend in the radial direction of the magnetic sheet 16 from the entrance side of the magnetic sheet 16 into the magnetic head 15.
A first inclined surface portion 31 is provided at a portion approximately in the middle of the magnetic sheet 16, which is inclined so as to gradually approach the magnetic sheet 16 which has been curved and deformed to bulge due to the protrusion of the magnetic head 15. . That is, this first inclined surface portion 31
The tip of the magnetic head 15 forms an inclined surface that is relatively inclined along a line along which the tip of the magnetic head 15 moves in the radial direction of the magnetic sheet 16 from the entrance side. The first inclined surface 31 gradually compresses the airflow generated on the surface of the magnetic sheet 16 as the magnetic sheet 16 rotates, and the first inclined surface 31 and the magnetic sheet 16
A high pressure is obtained at a position where the magnetic sheet 16 is closest to the magnetic head 15, that is, a portion adjacent to the through hole 29, and this pressure presses the magnetic sheet 16 toward the magnetic head 15. The airflow compressed on the first inclined surface 31 in this way is
When ejected from this inclined surface 31 toward the through hole 29 side, it is diffused and depressurized, but the pressure is reduced to atmospheric pressure in the through hole 29 .

Note that the first inclined surface 31 is similar to the magnetic head 1.
It is sufficient that the magnetic sheet 16 substantially gradually approaches the magnetic sheet 16 which is curved and deformed so as to bulge due to the protrusion of the magnetic sheet 5 .

Furthermore, the sheet pad 26 extends from a substantially intermediate position between the both sides 35 and 36 of the through hole 29 to the exit side of the magnetic sheet 16 from the magnetic head 15 at the end portion of the first inclined surface portion 31. A second inclined surface portion 32 is provided that once moves away from the magnetic sheet 16 in a direction and then gradually approaches the magnetic sheet 16 again.

This second inclined surface 32 corresponds to the magnetic sheet 16
The airflow that has been returned to atmospheric pressure as described above is gradually compressed on the surface facing the through hole 29, and a high pressure is obtained at a position where the second inclined surface 32 and the magnetic sheet 16 are very close to each other. This pressure presses the magnetic sheet 16 toward the magnetic head 15.

Further, the seat pad 26 is provided with an auxiliary recess 33 that is continuous with the second inclined surface 32, and further continuous with the auxiliary recess 33, the magnetic sheet 16 is provided with an auxiliary recess that gradually approaches the magnetic sheet 16 in its traveling direction. An inclined surface 34 is formed. The above auxiliary recess 33
is compressed at the second inclined surface 32 and communicated with the atmosphere and has a sufficient volume so that the airflow ejected from this inclined surface 32 can be quickly reduced to atmospheric pressure. Then, the auxiliary inclined surface 34 recompresses the airflow that has been returned to atmospheric pressure as described above, and the magnetic sheet 16 is compressed by the pressure.
It is becoming more and more pressing.

In this way, the three inclined surfaces 31, 32, 3 are formed in series in the tangential direction of the magnetic sheet 16.
4 is configured so that the pressing force against the magnetic sheet 16 obtained by the compressed air flow is suitably balanced between the entrance side and the exit side of the magnetic sheet 16, sandwiching the magnetic head 15. The inclination angle with respect to the magnetic sheet 16 and the distance with respect to the magnetic sheet 16 are set appropriately.

In addition, the through hole 29 of the seat pad 26
, i.e., the magnetic sheet 1
As shown in FIGS. 5 and 6, both side portions 35 and 36 located on the axis side and the outer peripheral side in the radial direction of It is made with an inclined surface formed. As shown in FIG. 7, these side portions 35 and 36 are formed so as to gradually approach the magnetic sheet 16, which has been pressed and curved by the magnetic head 15, in its traveling direction. Further, from a substantially intermediate position of the both side portions 35 and 36 to the exit side of the magnetic sheet 16 from the magnetic head 15, a direction in which the magnetic sheet 16 is once separated from the magnetic sheet 16 at the end portion of the first inclined surface portion 31 is formed. Recesses 37 and 38 are provided so as to move away from the magnetic sheet 16 and gradually approach the magnetic sheet 16 again. These recesses 37 and 38 are continuous with the second inclined surface portion 32 so as to be flush with each other.

Therefore, the both side portions 35 and 36 gradually compress the air flow generated on the magnetic sheet 16, and the position where these side portions 35 and 36 are closest to the magnetic sheet 16, that is, the magnetic head of the magnetic sheet 16, is High pressure is obtained at the portions located on both sides of the magnetic sheet 15, and this pressure presses the magnetic sheet 16 toward the magnetic head 15. These side parts 35 and 36 are connected to the magnetic head 1.
5 are arranged at equal distances and have the same width and height, so that the magnetic sheet 16 is pressed on both sides of the magnetic head 15 in a well-balanced manner. When the airflow compressed by these both sides 35, 36 passes through these both sides 35, 36, it is reduced to atmospheric pressure in the recesses 37, 38 provided here,
Further, it flows toward the second inclined surface 32 side.

In the electronic camera equipped with the seat pad 26 formed in this way, it is possible to obtain a suitable compression pressure of the air flow at each of the inclined surfaces 31, 32, and 34 provided on the seat pad 26, and this pressure The magnetic sheet 16 can be pressed by the magnetic sheet 16, and the negative pressure generated between the magnetic sheet 16 and the sheet pad 26 is eliminated by the through hole 29 communicating with the atmosphere and the recesses 33, 37, and 38. It is possible to realize smooth running of the magnetic sheet 16 with less rotational load, and as described above, even when the magnetic sheet 16 fixed to the rotary table 23 by the attraction force of the permanent magnet is rotated at high speed, This rotational speed will not be disturbed due to the rotational load.

Furthermore, since the magnetic sheet 16 is pressed between the magnetic head 15 at the entry and exit portions as well as at both radial sides of the magnetic sheet 16, the magnetic sheet 16 is pressed against the magnetic head 15. , it comes into sliding contact with the magnetic head 15 in a state where it is curved in the tangential direction, that is, in the direction of travel, and also in the radial direction of the magnetic sheet 16. Therefore, the magnetic sheet 16 does not come into sliding contact with the magnetic head 15 while being tilted to one side, and even if the magnetic sheet 16 has radial distortion, the side portions 35 or 36
Therefore, the magnetic sheet 16 and the magnetic head 15 are pressed securely, and the sliding contact between the magnetic sheet 16 and the magnetic head 15 is not disturbed.

Further, the magnetic head 15 of the seat pad 26
Since the relief portion for protrusion is formed in the through hole 29, the seat pad 26 has a substantially square-shaped structure that is relatively easy to bend. Therefore, even if internal stress is generated in the seat pad 26 during processing of the seat pad 26 and the seat pad 26 is slightly deformed from the predetermined shape, the seat pad 26 can be corrected to the predetermined shape.
It is easy to fix to the support arm 28. Additionally, when processing the seat pad 26, there is no need to use a complicated processing method to suppress the generation of internal stress.

Further, since the through hole 29 is provided, the surface of the magnetic sheet 16 can be visually observed through the through hole 29, so the surface of the magnetic sheet 16 can be observed through the through hole 29 using a microscope or the like. . Therefore, when manufacturing the sheet pad 26, the first inclined surface and the second inclined surface 3 of the surface of the magnetic sheet 16 are inspected from above the sheet pad 29.
2, and the state of sliding contact between each of these inclined surfaces 31 and 32 and the magnetic sheet 16 can be observed individually.
The inclination angle and protrusion amount of these inclined surfaces 31 and 32 are
It is also easy to suitably set the shape corresponding to the deformed shape of the magnetic sheet 16.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-mentioned embodiments and can be modified in various ways. For example, instead of the through hole 29, a concave portion may be provided as the relief portion. Further, each of the inclined surfaces 31, 32, and 34 of the seat pad 26 may be formed into a curved shape corresponding to the curved shape of the magnetic sheet 16 in the radial direction. If formed in this way, the both side parts 35 and 36 located on both sides of the sheet pad 26 will suitably face the magnetic sheet 16, and these both side parts 3
The pressing force exerted on the magnetic sheet 16 by the magnetic sheets 5 and 36 also becomes stronger. In addition, the auxiliary inclined surface 34
A plurality of the auxiliary recesses 33 may be formed to apply a pressing force to a wide range of the magnetic sheet 16, so that the magnetic sheet 16 can run in a balanced manner.

In addition, the present invention is not limited to the above-mentioned electronic camera.
It can be widely applied to various magnetic recording and/or reproducing devices configured to record or reproduce information signals by bringing the magnetic head 15 and the traveling magnetic sheet 16 into sliding contact.

<Effects of the Invention> As is clear from the description of the embodiments described above, according to the present invention, the first and second inclined surfaces provided on the seat pad and connected at both sides can maintain a suitable compression pressure of the air flow. This pressure can press the magnetic sheet toward the magnetic head, and at the same time, the negative pressure generated between the magnetic sheet and the sheet pad is eliminated at the relief part, which makes the magnetic sheet and the magnetic head suitable for each other. It is possible to obtain a good sliding contact pressure, and also to realize smooth running with a small load on the magnetic sheet.

Furthermore, by the first and second inclined surface portions,
Since the magnetic sheet is pressed at the entry and exit portions by holding the magnetic head of the magnetic sheet, and by pressing the magnetic sheet at both sides by holding the magnetic head, stable sliding contact between the magnetic head and the magnetic sheet is maintained. be able to. Therefore, according to the present invention, extremely high-quality magnetic recording or reproduction can be performed on the magnetic sheet. Further, it is easy to cope with higher density magnetic recording in magnetic recording and/or reproducing devices using such magnetic sheets.

[Brief explanation of the drawing]

FIG. 1 is a plan view of essential parts of an electronic camera showing an example of the seat pad, and FIG. 2 is a schematic side view illustrating the function of the seat pad. FIG. 3 is a front view of main parts showing one embodiment of the present invention, and FIG.
The figure is a plan view thereof. FIG. 5 is a side sectional view of the seat pad described in the above embodiment;
The figure is a plan view showing the sheet facing surface of the seat pad, and FIG. 7 is a side view of the seat pad. 15...Magnetic head, 16...Magnetic sheet, 2
6... Seat pad, 29... Through hole, 31...
First inclined surface portion, 32...Second inclined surface portion, 3
5, 36...Both sides.

Claims (1)

[Claims for Utility Model Registration] A seat pad is provided which faces the magnetic head via a magnetic sheet, and the seat pad is provided with a relief part for protruding the magnetic head at a portion facing the magnetic head, A first inclined surface portion that gradually approaches the magnetic sheet is provided at a portion extending from the entrance portion side of the magnetic sheet to a substantially intermediate position between both sides of the relief portion in the radial direction of the magnetic sheet, and further includes: a first inclined surface portion that gradually approaches the magnetic sheet; a second slope that once moves away from the magnetic sheet and gradually approaches the magnetic sheet again at the terminal end portion of the first slope from the approximately intermediate position to the exit side of the magnetic sheet with respect to the magnetic head; A magnetic recording and/or reproducing device provided with a surface section.