JPS5952478A - Magnetic recorder and reproducer - Google Patents

Abstract

PURPOSE:To attain a small sized, light weight and large capacity of recorder and reproducer, by storing freely turnably a magnetic disc in a storage case of dust proof construction and integrating the tip of a main magnetic pole plate together with the dust proof plate at the opening of the storage case so as to be freely movable in the radial direction of the disc. CONSTITUTION:In shifting the tip 4 of a main magnetic pole on the disc 1 together with a support 5, since the number of turns of one of plate springs 6a, 6b is increased and the other is decreased, the tip 4 of the main magnetic pole is held freely turnably in the opening section 2a. An opening section 2b of the other of the disc 1 is provided with a flexible dust proof plate 7, and the auxiliary magnetic pole is arranged in the opening section 2b in opposition to the main magnetic pole tip 4 via the dust proof plate 7. The main magnetic pole tip 4 is pressed to a magnetic substance layer 1c with some floating of the disc when the disc 1 is rotated. The auxiliary magnetic pole 10 is shifted upward at the recording and reproducing to set the distance with the main magnetic pole tip 4 to 100-150mum. Since the dust proof plate 7 is lifted upward with the auxiliary magnetic pole 10, the thickness is taken as <=50mum.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording and reproducing device for magnetically recording and reproducing information or images in whole 1JC, and which is easy to magnetize in the direction perpendicular to 1F in 11K. The present invention relates to a vertical magnetic recording/reproducing apparatus for recording and reproducing information on a disk-shaped perpendicular magnetic recording medium having a vertical magnetic recording medium.

As is well known, conventional magnetic self-recording and reproducing devices use magnetic gears,
A so-called ring-type magnetic head 1, in which all the wires are wound around a magnetic core having a horizontal f3, has an axis of easy magnetization in a direction perpendicular to the thickness direction of the recording medium, that is, in a horizontal direction.
2. Description of the Related Art Horizontal magnetic recording devices for recording and reproducing data on and from X-ray recording media are known. Conventionally, the cost of this type of equipment has been such that it has been difficult to increase the recording VFI degree in the row direction due to the self-demagnetizing effect of the recording medium and the increase in demagnetizing effect due to adjacent magnetization. .

On the other hand, in recent years, (1 movement recording; 4 orthogonal directions on the medium (
A so-called river surface magnetic recording method has been proposed that has a single easy axis.
As described in No. 2-134706, the short 't7
The recording +1'r property with respect to the data length is improved by f*, and together with the improvement in the recording density in the direction perpendicular to the running direction of the recording medium due to the decrease in the track width, 4@ highly reliable high-density recording is achieved. This makes it possible to relatively reduce the size of the recording medium required to record 1+Th of the same information compared to the horizontal magnetic recording method, which uses 1/li.

For example, one video signal per track on a disc-shaped magnetic recording medium.
Considering the case of recording frames, in the NTSC system, the FM modulation center frequency is f and the recording wavelength on the medium is λ.
, and the best known inner diameter of the recording portion of the medium is d, the following relationship generally holds between these.

Therefore, for example f ''' 7.5 MHz,
In order to make d = 20 m, λ #025 μm is required, and it is extremely difficult to achieve this recording wavelength using conventional horizontal magnetic recording methods.On the other hand, when using perpendicular magnetic recording methods with a ratio of 1- It is easy to realize the above recording wavelength. In addition, complete still images by NTSC system 6
Recording of the video signal for four fields to obtain 1° is also sufficiently riJ' (iP).

However, when specifically implementing a magnetic recording/reproducing apparatus employing this non-direct magnetic recording method, there are the following problems. In other words, as stated in (1), by shortening the iL wavelength, the ξ-sing loss, which depends on the distance between the main pole and the recording medium that constitutes a part of the magnetic head, increases). 'I won't be able to get 1.

(2) The size of dust that affects recording is proportional to the recording wavelength; the shorter the recording wavelength, the more susceptible the layer is to being affected by minute dust.

The present invention solves the above problems and uses a perpendicular magnetic recording system! The purpose of this invention is to provide a small-sized, one-diameter, and large-capacity I1η Kiki sickle reproducing device.

In order to achieve the above object, the present invention rotatably stores a disk-shaped perpendicular magnetic recording medium in a storage container with a dust-proof structure, and magnetically 1411 of the storage container so that the tip of the main magnetic pole, which forms part of the head, can be moved freely in the lanoal direction of the recording θ■ body.
It is characterized in that it is configured to be integrated with the dustproof plate in the 0 part.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

Figures 1 to 3 all show one embodiment of the present invention; Figure 1 is a diagram showing the external appearance of a recording medium storage container with a dustproof structure, and Figure 2 is a diagram showing its internal structure. be.

In FIGS. 1 and 2, the number 1 indicates a floppy disk, which is a disk-shaped perpendicular magnetic recording medium.
The floppy disk 1 is formed by laminating, for example, a flexible nonmagnetic substrate 1a, a gummalloy layer 1b, and a magnetic layer 1c mainly composed of Conolt chromium.
It is rotatably housed in a dust-proof cassette case 2, which will be described later. Further, a driving hub 3 is integrally provided at the center of rotation of the floppy disk 10, and on both sides 11iTJl'i of this driving hub 3, it protrudes beyond the cassette case 2 and has a not-shown portion in its center. A rotation hole 3a is provided which connects the drive shaft of the main body of the device and applies rotational force to the floppy disk 1.

The cassette case 2 has rectangular openings 2a on both 4ti11 surfaces facing the disk surface of the floppy disk 1, which are oriented in the radial direction of the floppy disk 1.
In the opening 2a on the side of the magnetic layer Jc of the floppy disk J, a main magnetic pole light 0i1i' section 4, which forms part of the perpendicular magnetic recording/reproducing head, is provided to face the floppy disk 1. It is provided so as to be movable in the radial direction. That is, this main magnetic pole leading 1"1.
The first part 4 is embedded and integrated into a support 5 made of a non-magnetic material such as glass, and a bag-shaped frame 5a, 5b with one end open is provided at the bottom of the support 5. are provided corresponding to the outer circumference side and the inner circumference 9+11 of the floppy disk 1. Inside this frame 5a * 5b are ultra-thin 1lIi that are each spirally wound! Cloth board/gune 6B.

6b is stored, and their -shape is the frame 5a.

5b, and are fixed to the inner surface of the cassette case 2 separately at the outermost circumferential side and the innermost circumferential side of the floppy disk 1.

Therefore, when the main magnetic pole tip 4 moves in the radial direction on the magnetic layer lc of the floppy disk 1 due to the movement of the main magnetic pole of the main body of the device, which will be described later, together with the support 5, the main magnetic pole tip 4 is a plate.
Since one of the windings 5 a * 6 b increases the number of turns and the other only decreases the number of turns, f8 of the main pole tip 4
, Q'lb and K, PJ does not provide any resistance, and the main pole tip 4 is held movably within the opening 2a.

Further, the main pole tip 4 is located inside the cassette case 2 to some extent due to the biasing force of the leaf springs 6a + 6b, and is placed in a position where it contacts the magnetic layer 1c of the floppy disk 1. The tip is finished in a curved shape so that it slides smoothly on the magnetic #1c of the floppy disk l. Note that the rear end portion is finished in a shape that matches the main magnetic pole portion of the main body of the device N.

On the other hand, a dustproof plate 7 made of a flexible non-magnetic thin plate is provided in the other opening 2b of the board 1a 1Hll of the floppy disk J, and the auxiliary magnetic pole of the device main body is inserted into the dustproof plate 7 within this opening 2b. The main magnetic pole tip portion 4 is disposed opposite to the main magnetic pole tip portion 4 via the main magnetic pole tip portion 4 .

The leaf springs 6m and 6b not only hold the main pole tip 4 and the support 5, but also function as dustproof plates.

Figure 3 shows the state when the above-mentioned tHv disk cassette is installed in the main body of the device, and the main magnetic pole part of the main magnetic pole part of the Mononoke device main body and its support body, indicated by reference numerals 8 and 9 in the figure, is shown. 1° is an auxiliary magnetic pole, and 11 is an auxiliary magnetic pole excitation coil.

As is clear from the figure, the main magnetic pole tip 4Iri, the main magnetic box 8 of the main body, and the magnetic 4J (the number and position of the magnetic poles are minimized as much as possible, and the floppy disk 1 is rotated. In this state, the disk is pressed against the magnetic layer 1c by slight floating.

On the other hand, the auxiliary magnetic pole 10 is disposed in the opening 2b) facing the main pole tip 4, sandwiching the four-piece disk 1 and the dustproof plate z, and moves in the upward direction of the arrow during recording and reproduction. Distance ff: Set to 100 to 150 μm. At this time, since the dustproof plate 7 is pushed upward by the auxiliary magnetic pole xoK and becomes a ledge-shaped piece, it is preferable to make the thickness of the plate 7 less than 50 μm so as not to interfere with the rotation of the floppy disk l.

In this way, the main magnetic pole placed in contact with the magnetic layer 1c of the floppy disk 1 and the auxiliary magnetic pole J (7 is the excitation coil 1) placed opposite to each other sandwiching the floppy disk 1 and the dustproof plate 7 are used to generate a recording signal. Accordingly, the magnetic layer 1cK of the floppy disk 1 is energized to perform recording and reproduction.

In this embodiment, the floppy disk 1
is rotatably housed in a cassette case 2 having a skin structure, and the main pole tip 1 part 4 is separated from the main body of the device so that it can be moved freely in the radial direction of the disk 1. There is an opening 2aK of the cassette case 2, and a leaf spring 6m serving as a dustproof plate.

Since it is integrated with 6b, recording and reproduction can be performed at a short wavelength without being affected by minute dust, and spacing loss can be suppressed as much as possible.

Note that the present invention is not limited to the embodiments described above. For example, the members stored in the frames 5g and 5b are:
J! Even if a film or the like is used for the purpose of preventing the infiltration of JIB, it is not enough.

The i2 recording medium is not limited to the flexible direct magnetic recording medium, but may also be a vertice 9 isk type medium.

As is clear from the above description, according to the present invention, a disc-shaped vertical (7h, The unit is integrated with the i/7 jet plate into the opening of the storage container so that it can move freely in the radial direction of the perpendicular magnetic recording medium. Magnetic recording/reproducing device l￥f: Can be provided.

[Brief explanation of the drawing]

Figures 11 to 3 all show one embodiment of the present invention. Figure 1 is a front view of a storage container with a gruel-proof structure, and Figure 2 is a cross-sectional view showing its internal structure. Figures 3 and 3 are state diagrams showing the state in which the storage container is attached to the main body of the device. 1...-floppy disk, 2...cassette case1. ?・=, "M nrJJ/%b, 4... Main iJ'+ I (i tip; l: M part, 6a+6b... Plate/gune, 7... Dust-proof plate, 8... F:, 5?1 bar part,
IO... Kamisuke magnetic pole. Applicant's agent: Ibenji Suzue Yohiko Figure 1 654 Figure 3

Claims (1)

[Claims] Perpendicular magnetic recording consisting of a circle having an axis of easy magnetization in the perpendicular direction (a main track 4 that is placed in contact with the magnetic layer of an H-shaped perpendicular magnetic recording medium, and an auxiliary magnetic pole that is placed facing each other with the perpendicular magnetic recording medium in between) In an a-type recording and reproducing apparatus having a reproducing head, the perpendicular magnetic recording medium is stored in a dust-proof structure storage container 2:
÷ The main pole tip is rotatably housed in the vertical direction.
A magnetic Fi12 recording and reproducing device 1q-0 is characterized in that it is integrated with a dustproof plate into the opening of the storage container so as to be movable in the radial direction of the magnetic recording medium.