JPH0119218Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention provides a recording medium in which the axis of easy magnetization is distributed around the direction perpendicular to the film surface and the residual magnetization in the perpendicular direction is larger than the residual magnetization in the in-plane direction, and A vertical magnetic head consisting of a main magnetic pole and an auxiliary magnetic pole 2 that are arranged opposite to each other to sandwich the recording medium in a direction perpendicular to its film surface in order to generate a signal magnetic field whose main effect is the perpendicular component of the recording medium. The present invention relates to a perpendicular magnetic recording and reproducing apparatus that uses a combination of the following and moves them relatively for recording.

In general, the perpendicular magnetic recording and reproducing method is suitable for high-density recording, and its applications include computer terminal devices such as magnetic disks and floppy disks, consumer video systems, and audio magnetic recording and reproducing devices. This reduces the size of the device,
High fidelity is expected. The magnetic head used in such perpendicular magnetic recording, as shown in an example in FIG. Conventionally, the auxiliary magnetic pole 2 and the main magnetic pole 1 form a magnetic recording medium 3 (i.e., a Co--Cr thin film 3a having an axis of easy magnetization in a direction perpendicular to the film surface). A device is proposed in which recording is performed by sandwiching a base 3b (formed by high-frequency sputtering method) on a base 3b of polyester or the like and passing a signal current through a recording/reproducing coil 4 wound around the auxiliary magnetic pole 2. has been done.
Incidentally, reference numerals 5 and 5' designate glass holders for reinforcing the thin film main pole 1 in between.

However, in such a conventional device, the recording medium 3
The contact state between the main magnetic pole 1 and the recording medium 3 during traveling in the direction of arrow A was poor, and the recording and reproducing characteristics thereof were unstable. Moreover, since the structure of the magnetic head is an open magnetic path with the main magnetic pole 1 and the auxiliary magnetic pole 2 separated, its recording and reproducing characteristics are susceptible to fluctuations in the running of the recording medium 3, and in particular, the reproduction efficiency is likely to decrease. It was significant.

The present invention has been developed in view of this point, and it uses a separate pressing member to always press the recording medium against the main magnetic pole with a constant force, and also supports the pressing member to bring the auxiliary magnetic pole into contact with the recording medium. The present invention aims to provide a perpendicular magnetic recording and reproducing device in which the magnetic resistance of the auxiliary pole is reduced by using a high permeability magnetic material as the support member provided on the side, and an embodiment of the present invention will be described below with reference to the drawings. . Note that parts that are the same as those in the prior art will be given the same drawing numbers and their explanations will be omitted.

That is, according to the present invention, as shown in FIG. 2, the pad 6 as a pressing member made of an elastic material such as the pad material used in ordinary compact cassettes is made of a high permeability magnetic material. At the same time, the support member 7 is attached to the side of the support member 7 that comes into contact with the recording medium 3, and the support member 7 is fitted into the auxiliary magnetic pole 2 so as to be movable in the direction of approaching and separating from the recording medium 3.
The main magnetic pole 1 side is always movably energized.

Therefore, according to the present invention, as shown in FIG. 2, the recording medium 3 is held between the main pole 1 and its glass holder 5 by the pad 6 which is urged toward the main pole 1 side via the support member 7 by the spring 8. The main magnetic pole 1 and the recording medium 3 can be brought into pressure contact with the contact surface formed by the main magnetic pole 1 with a constant force, and the recording medium 3 in the vicinity of the main magnetic pole 1 can be maintained in a good contact state. The running performance of the vehicle can also be improved. Furthermore, since the support member 7 fitted around the auxiliary magnetic pole 2 is made of a high permeability magnetic material, the magnetic resistance of the auxiliary magnetic pole 2 can be reduced and the recording and reproducing efficiency can be improved. I can do it. Note that 9 and 9' are stoppers for the spring 8.

In addition, FIG. 3 shows another embodiment in which the recording/reproducing coil is wound around the main magnetic pole side, and in this case, the main magnetic pole 1
Since it is a magnetic thin film (usually about 0.3 μm to 1 μm thick), it is not possible to wrap a recording/reproducing coil in that state, so the magnetic saturation prevention member 10 made of a high magnetic permeability magnetic material such as ferrite is used. The magnetic saturation prevention member 10 is connected to the recording medium 3 side by means of reinforcing glass holders 5 and 5' so as not to affect the magnetic field characteristics at the tip of the main pole 1. is shielded. Therefore, with such a configuration, since there is no recording/reproducing coil 4 on the side of the auxiliary magnetic pole 2, the configuration of the auxiliary magnetic pole 2 becomes simpler than that shown in FIG.

Next, an auxiliary magnetic pole having such a configuration was installed in a cassette housing in which a recording medium having an axis of easy magnetization in a direction perpendicular to the film surface was wound around a pair of reel hubs, and the current magnetic recording and reproducing system for audio was used. FIG. 4 shows an embodiment in which perpendicular magnetic recording and reproduction can be performed similarly.

That is, 3' in the figure indicates a pair of reel hubs 11,
11' and housed in the cassette housing 12 (that is, a Co--Cr thin film having an axis of easy magnetization perpendicular to the film surface is formed on a base of polyester or the like). , this cassette housing 1
The vehicle runs along the openings 12a to 12e formed on the front surface of 2. Reference numeral 2' denotes an auxiliary magnetic pole disposed inside the cassette casing 12, facing perpendicularly to the back surface (i.e., the base side) of the recording medium 3 and facing the opening 12c through the recording medium 3'; The aforementioned supporting member 7', pad 6', etc. are fitted into the auxiliary magnetic pole 2'.

Therefore, in this embodiment, as shown in FIG. 3, the main magnetic pole 1 around which the recording/reproducing coil 4 is wound is mounted on a movable substrate (i.e., a head substrate) in the same way as in the current audio magnetic recording/reproducing system. By disposing the movable substrate in such a way that the main magnetic pole 1 can move vertically toward and away from the recording medium 3' in response to recording and reproducing operations, perpendicular recording and reproducing to the recording medium 3' can be performed. It can be performed in the same way as the current magnetic recording and reproducing system for audio. That is, in a state where the main magnetic pole 1 is in contact with the recording medium 3' and the recording medium 3' is traveling in the direction of arrow B by the rotational drive of each reel hub 11, 11', a signal is sent to the recording/reproducing coil 4 of the main magnetic pole 1. When a current is applied to the recording medium 3', perpendicular recording can be performed on the recording medium 3', and conversely, if the recording medium 3' has already been recorded, a signal current is generated in the recording/reproducing coil 4 to perform vertical reproduction. I can do it.

As described above, according to the device of the present invention, a recording medium having an axis of easy magnetization in a direction perpendicular to the film surface, and a recording medium disposed facing each other so as to sandwich the recording medium in a direction perpendicular to the film surface. a main magnetic pole and an auxiliary magnetic pole; a supporting member fitted into the auxiliary magnetic pole so as to be movable in a direction toward and away from a recording medium; a pressing member provided on a side of the supporting member that contacts the recording medium; The recording medium is provided with an elastic member that movably biases the supporting member toward the main magnetic pole, and the recording medium is caused to travel with the film surface of the recording medium pressed against the main magnetic pole by the pressing member. It is possible to maintain a good contact state between the main magnetic pole and the recording medium at all times, and it is also possible to improve the running performance of the recording medium in the vicinity of the main magnetic pole, making it possible to perform stable recording and reproduction.

Furthermore, according to the present invention, since the supporting member is made of a high permeability magnetic material to reduce the magnetic resistance of the auxiliary magnetic pole, the recording and reproducing efficiency can be improved, and this effect is particularly noticeable in the main magnetic pole. This feature is particularly useful in perpendicular magnetic recording and reproducing devices having an open magnetic path configuration in which the magnetic pole and the auxiliary magnetic pole are separated.

Further, according to the present invention, due to its structure, the recording medium can be preferably pressed against the main magnetic pole from the vertical direction in the vicinity of the auxiliary magnetic pole, and the auxiliary magnetic pole can be disposed inside the cassette case for recording and reproducing. When the coil is wound on the main magnetic pole side, it can be easily applied to the current audio recording and reproducing system, and will greatly contribute to the practical application of the perpendicular magnetic recording and reproducing system.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the principle of a conventional perpendicular magnetic recording/reproducing device, Fig. 2 is a principle diagram showing an embodiment of the perpendicular magnetic recording/reproducing device of the present invention, and Fig. 3 is a principle diagram showing another embodiment. FIG. 4 is a perspective view showing a specific application example of the device of the present invention. DESCRIPTION OF SYMBOLS 1...Main magnetic pole, 2...Auxiliary magnetic pole, 3...Recording medium, 6...Pad as a pressing member, 7...Supporting member, 8...Spring as an elastic member.

Claims (1)

[Scope of utility model registration request] A recording medium having an axis of easy magnetization in a direction perpendicular to the film surface, a main magnetic pole and an auxiliary magnetic pole arranged opposite to each other to sandwich the recording medium in a direction perpendicular to the film surface, and the auxiliary magnetic pole a support member fitted and inserted so as to be movable in the direction of contacting and separating from the recording medium; a pressing member provided on the side of the support member that contacts the recording medium; A perpendicular magnetic recording/reproducing device, comprising: an elastic member, in which the recording medium runs with the film surface of the recording medium being pressed against the main magnetic pole by the pressing member, wherein the supporting member is made of a high permeability magnetic material; A perpendicular magnetic recording/reproducing device characterized in that the magnetic resistance of the auxiliary magnetic pole is reduced.