JPS5924440A - Magnetic recording medium - Google Patents

Abstract

PURPOSE:To forming a thin film of magnetic material with high coercive force on an outer circumferential surface of a plastic molding and mass-produce magnetic recording media capable of high-density recording, and to using them for electronic camera, by using the plastic-made molding which has the specular outer circumferential surface with, for example, about 0.01mum surface roughness as a base body. CONSTITUTION:When the magnetic film is stuck to the outer circumferential surface of the base body 1, a female mold 9 having a specular inner circumferential surface is used. Namely, amorphous material (e.g. quartz glass) is used for the inner circumferential surface and its surface is polished optical to obtain a mirror-finished surface with about 0.01mum surface roughness. This mold is used to form the outer circumferential flank of the base body 1 with about 0.01mum surface roughness. Thus, the base body 1 has the specular surface where the magnetic film is stuck by extruding plastic material, and the magnetic film is formed on the specular surface by vapor deposition, sputtering, electroless plating, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is useful for recording various information signals.
:,) Magnetic recording media that can perform high-density recording, especially magnetic recording media that can be used effectively when miniaturizing recording devices, etc. It provides a recording medium.

(Prior art) Magnetic recording media have traditionally been in various shapes such as 7-1, cheese-shaped, disc-shaped, and cylindrical. As is well known, this is the first step.

A cylindrical magnetic recording medium in which an m-type film is formed on the outer peripheral side surface of the cylinder uses 1/! r, :, 5
B The rotational drive mechanism in the air recording device is in the cylinder, and the relative linear velocity between the air head and the magnetic recording medium is constant no matter where it is on the magnetic recording medium. It has been put to practical use in various types of magnetic recording devices due to its characteristics such as the ability to
reactor.

Now, in recent years, Video Team 7 Record [VTR]
), as well as the use of solid-state imaging devices and integrated circuits of various types. The development and research of the above-mentioned ultra-compact VTR and ultra-compact camera-integrated VTR (v-I, so-called electronic 8mm device), which has an integrated configuration with an ultra-compact camera, is being actively conducted. With the arrival of the 5th generation, research and development is also being conducted on so-called electronic cameras that record still images electronically instead of still cameras that use photographic film. Electronic cameras that record video signals using ultra-compact magnetic disks instead of photographic filters have been miniaturized to the same size as a 35mm single-lens reflex camera. has already reached the stage of practical application and was scheduled to be published this year.The applicant's company also uses a cylindrical magnetic recording medium about the size of a 35mm photographic film batone to take frame-by-frame photographs. We have been making proposals for ultra-compact imaging and recording devices that are capable of recording and short-term continuous recording.

In a cylindrical magnetic recording medium, the relative linear velocity between the magnetic film and the recording self-generating element is constant over the entire circumference of the magnetic recording medium. There is a possibility that the entire circumferential surface of a magnetic recording medium can be effectively used as a recording area, and the first one is, for example, a 35 mm film cartridge (total length: 47 mm, diameter: 25 W + 1), A certain f is a case for storing the batonne (total length 53 m).
Even if the size is similar to that of the world's most popular type of home VTR, the relative linear velocity between the magnetic head and the magnetic tape is 5.8 m/m.
Since a relative linear velocity comparable to s can be obtained, for example, if a cylindrical magnetic recording medium with a diameter of 31 mm and a length of 50 mm is rotated at 3600 revolutions per minute, its circumferential velocity will be 5.8 m/s.
1 field and 1 minute of the video signal are to be recorded for each -rotation of it, and the recording trace] is 3 μm, and the Gartobano I
, is 15 μm, and the recording trace interval is 4.5 μm, 10,800 frames of still images can be recorded on a cylindrical recording medium with the shape and dimensions as shown above, and a normal W video signal can be recorded. Continuous recording for 3 minutes and adoption of field skip method! By installing a motor for driving the recording medium in the hollow internal space of the magnetic recording medium, a large recording capacity can be obtained with a small size, such as 6 minutes of recording is possible. It is easy to miniaturize the magnetic recording device or the magnetic recording/reproducing device, and it is effective in configuring the imaging type recording device to be small and lightweight.

By the way, as a cylindrical magnetic recording medium proposed by the applicant company as being able to be effectively used in the above-mentioned image capturing and recording apparatus, that is, a magnetic recording medium having a configuration in which a recording surface is formed on the outer peripheral side of the cylinder. is a metal such as aluminum, f is a synthetic resin material, etc., and a precise polishing process is performed on the outer peripheral side surface of the cylindrical base, and the polishing process achieves the required surface roughness and surface accuracy, or A magnetic layer or a layer is formed on the outer circumferential surface of the cylindrical substrate, which has been made smooth (with a smooth surface), by applying, for example, a magnetic paint, vapor deposition of a magnetic material, sputtering, electroless plating, or various other adhesion means. A cylindrical magnetic recording device constructed by adhering a magnetic film (Japanese Patent Application No. 56-17)
1868 specification) or a flexible plastic film such as a polyethylene terephthalate film with a magnetic film attached thereto, the ends of which are bonded together in a cylindrical shape to form a cylindrical magnetic recording medium. (See Japanese Patent Application No. 57-37851), and others.

(Problems to be Solved by the Invention) In the former type of magnetic recording medium in the prior art, the magnetic layer is attached when the magnetic recording medium is made to perform high-density recording self-propagation. The surface of the cylindrical base to be formed must be made to have extremely smooth smoothness.Firstly, a high precision polishing process is required to polish the cylindrical base. is required,
Naturally, this has the disadvantage that the processing process becomes complicated and the cost of the product becomes high.

In the latter type of magnetic recording medium in the prior art, when the end portions of flexible magnetic recording media are bonded together, the bonded portion may have no unevenness. The problem was that it was extremely easy to mass-produce magnetic recording media in such a way that magnetic recording media could be constructed.

That is, when a flexible recording medium is bent into a cylindrical shape and its ends are butted together and pasted together to form a cylindrical magnetic recording medium with a predetermined diameter, On the outer peripheral side of a cylindrical laminating jig having a predetermined diameter,
As mentioned above 1. - It is necessary to wrap a magnetic recording medium notebook cut into a size that allows it to go around the outer peripheral side of a cylindrical laminating jig exactly one time, and then paste the butt ends of the notebook. However, the poles (such as slight dimensional errors or extremely slight dimensional errors in the diameter of the cylindrical bonding jig) that occur during cutting to obtain the magnetic recording medium/-t of the predetermined shape and dimensions mentioned above, Even if there is, overlap may occur between the abutting ends of the magnetic notes, and a gap may occur between the abutting ends of the magnetic notes.

Then, as described above, unevenness occurs between the butted ends of the magnetic notebook.In this case, the magnetic head jumps or shoots when passing the unevenness, so the unevenness In addition, in a cylindrical magnetic recording medium that rotates at high speed, the recording surface of the magnetic recording medium and The solid air gap in the magnetic head can quickly become damaged.

Now, as already mentioned, by using a hollow cylindrical magnetic recording medium, it is possible to easily realize a compact magnetic recording device or a magnetic recording internal device. Miniaturization tt, y, - In a magnetic recording device or a magnetic recording internal device, the size of the magnetic recording medium remains the same, and even longer recording and reproduction can be performed with the magnetic recording medium. In order to achieve this, we first developed a structure that enables even higher density recording as a magnetic recording medium, that is, a metal magnetic film (film thickness of approximately 100 angstroms) with high coercive force (He: 1300 oersteds) as a base material. Attempts were made to form a single magnetic film by depositing it on the surface, but as mentioned above, the thickness of the magnetic film was 10.00 mm.
A magnetic film is deposited and formed on the order of 1 angstrom (about 0.1 μm), and is used when recording and reproducing information signals having a recording wavelength of several zero tenths of μm cannot be performed. The base of the cylindrical magnetic recording medium is required to have a high precision surface roughness of around 001 μm.

However, even if the surface of the substrate of a cylindrical magnetic recording medium is subjected to mechanical precision finishing such as polishing or polishing, and the surface of the substrate is finished to a high precision, the resulting The surface roughness is on the order of a few tenths of a micrometer, and when a metal magnetic film with a high coercive force of about 1000 angstroms in thickness was deposited on the surface of a substrate with such surface roughness, a good result was obtained. It is impossible to obtain a cylindrical magnetic recording medium with a magnetic film having surface properties, and it is impossible to obtain a cylindrical magnetic recording medium by finishing the surface of the substrate by the above-mentioned mechanical precision finishing process. Since magnetic recording media are expensive, it is also difficult to use them as recording media for other types of imaging and recording devices, such as electronic cameras.

As mentioned above, in order to achieve even higher density recording, a cylindrical magnetic recording medium employing a metal magnetic film with high coercive force as the magnetic film is recommended. In order to be able to use a material with a surface roughness of, for example, 0.01 μm as an adhesion formation surface, it is necessary to have a structure that is highly productive. .

(Means for Solving the Problems) The present invention uses a plastic substrate which is molded so that the magnetic film to be adhered and formed has a mirror surface. - A magnetic recording medium with no problems, i.e., a thin-walled magnetic recording medium that has the outer shape of a truncated right circular cone, similar to the original right circular cone with a small apex angle, and is molded into a hollow thorn-like shape11. A magnetic film is attached and formed on the mirror-like outer circumferential side of the plastic base, and the bottom side of the base is open, and the top side of the base has a rotary drive mechanism. A magnetic recording medium provided with an engaging portion 1, and a magnetic recording medium having the above-mentioned cylindrical configuration can be rotated in a storage container in a state of non-contact with the wall of the storage container. By providing a tongue-shaped magnetic recording medium, the above-mentioned conventional problems are solved.

(Example) Hereinafter, specific contents of the magnetic recording medium of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view of one embodiment of the magnetic recording medium A of the present invention, and in this FIG. ing.

In Fig. 1 f, 1 has a mirror-like outer circumferential surface h''C,
2 is a magnetic film attached to the mirror-like outer circumferential side of the base 1, and 3 is a magnetic film on which the rotation shaft of the rotation drive mechanism is fitted. The hole 4 is a retaining part between the base body 1 and the rotational drive mechanism, and this engaging part 4 is fixed to the base body 1.

The base body 1 is a hollow, thorn-shaped, thin plastic molded product having the outer shape of a right circular truncated cone obtained by cutting a right circular cone along a plane parallel to the bottom surface of the cone. is an open tongue, and the above-mentioned hole 3 is provided in the upper bottom surface 6, and the retaining part 4 is fixed by an appropriate fixing means. The base body 1 is provided with a mark portion 7 for generating a signal indicating the rotational phase of the base body 12). The base body 1 is provided with a T-shaped mark portion that generates a signal indicating the rotational phase of the base body l, and the mark portion 7
Generate a signal indicative of the rotational phase of the base 1, that is, the magnetic recording medium, in correspondence with the rotational phase of the magnetic recording medium. 11 In this case as well, a specific portion of the recording signal is placed on a specific bus line on the recording medium by using the rotational phase signal generated in correspondence with the beam section 7 provided on the substrate. It is also possible to record the information signals in parallel, so that the recording of information signals on the E11='A recording medium is not continued in the V-5 state even if the recording medium is attached to and detached from the rotational drive mechanism multiple times. 1 to 5, it is possible to record a specific part of the recording signal, for example, the vertical blanking period in TV No. 71719, by aligning it with an area including a specific bus line on the magnetic recording medium. Even when the information signal recorded in the image data is reproduced automatically, good reproduced peaks can always be obtained without causing any image disturbance.

In the illustrated example, the mark portion 7 is located close to the bottom surface 5 side of the base body 1.
The mark part 7 may be provided at a part close to the upper bottom surface 6 of the base 1, and the -Cv-rotation part 7 may be provided at a part close to the upper bottom surface 6 of the base body 1. Depending on the construction principle and operating principle for generating a signal indicating the
For example, generate a signal corresponding to the mark part 7 by optical means.
In this case, a signal corresponding to the mark part 7 may be generated by using a means such as ηf field. If the rotational phase signal is generated by the detection coil using f, then J:V-.

The base body 1 is constructed to have the outer shape of a truncated right circular cone, but the first original right circular cone has a small apex angle 2θ,
For example, it is about 1 to 2 degrees.

As you can see, the base 1 shown in drawing 5 has the outer shape of a right circular truncated cone, and the apex angle 2θ is a large angle as the original right circular cone. Give an example of a case.

FIG. 2 is a cross-sectional front view of the magnetic recording medium A shown in FIG. ·reactor. As the engaging part 4, a strong amphoteric material such as soft iron is used, and when the base body 1 is molded, the retaining part 4 is integrally embedded and fixed in the base body 1. What you should do is
This is a preferred embodiment.

Figure 3 shows a base 1 made of Norasbunoku with the retaining part 4 integrally embedded and fixed in the base 1 made of plastic.
It is an explanatory diagram when making by injection molding,
In this figure, 8 is the male mold, 9 is the female mold, and 10 is the injection of molten plastic], and the female mold 9 is removed first.
1, the retaining portion 4 is attached to the protrusion 8a of the male mold 8.
Then, the male mold 8 and the female mold 9 are combined, and molten plastic is press-fitted into the gap between the male mold 8 and the female mold 9 through the molten plastic injection port 10, and then the mold is cooled down. Remove the female mold 9 and male mold 8, and remove the plastic base l.
A base body 1 in which the engaging portion 4 is embedded and fixed is made.

The plastic base 1 made by injection molding as described above is designed so that the female mold 9 and the male mold 8 can be easily removed. In order to prevent the surface of the product from being damaged even by the movement and displacement of the female die 9 and male die 8 during production, the base l is not cylindrical but has the shape of a right circular truncated cone.

In terms of ease of injection molding work, products in the shape of a truncated right circular cone have a larger apex angle than the original cone of the truncated right circular cone. The base body 1 in the shape of a right circular truncated cone used for a recording medium has a structure in which the relative linear velocity between the recording medium surface and the magnetic head differs by a large range in the recording/reproducing main area formed on the outer circumferential side surface of the base body 1. For this reason, it is preferable to use a cone with a small apex angle as the original cone of the right circular truncated cone of the base body 1, so the cone with the small apex angle described above should be used as the original cone to the extent possible. A base body 1 having a shape of 5 right circular truncated cones is made.

Now, as mentioned above, the base 1 is made by injection molding.
Since the surface condition of C is a transfer of the surface condition of the male mold 8 and the surface condition of the female mold 9, this is the mold used to form the surface on which the magnetic film is attached on the substrate l. If the surface of the substrate 1 is mirror-finished, even if the substrate 1 is made by injection molding, the surface on which the magnetic film is deposited will be mirror-finished, and a V-type substrate will be obtained.

When a magnetic film is attached and formed on the outer peripheral side of the base l,
As a female mold 9, its inner peripheral surface is finished with a mirror finish -CV-
You should use one that is in good condition. That is, by using an amorphous material (for example, quartz glass) on the inner peripheral surface of the female mold 9 and applying optical polishing to the surface to give it a mirror-like finish, the surface roughness of the female mold 9 can be reduced to 0.01.
If a mirror surface of about .mu.m is used, the plastic substrate 1 can be mass-produced with a surface roughness of about 0.01 .mu.m on the outer peripheral side surface.

Materials for the base 1 made by injection molding as described above include polycarbonate, acrylonitrile, but/ene, styrene copolymer resin (ABS), acrylic resin, etc., as well as materials with heat resistance, impact resistance, and toughness. Can be used as a resin with excellent properties such as hardness and surface hardness, and good moldability.

During the molding process, the base l is formed by fitting the female mold and the male mold.
It goes without saying that K should be adjusted so that the axis of rotation can be accurately obtained.

The substrate 1 has a mirror-like surface formed by injection molding of a plastic material, and is coated with vapor deposition, sputtering, or electroless coating on the mirror-like surface on which the magnetic film is formed. A magnetic film is deposited and formed by plating or the like, and then mark portions 7 are provided at predetermined portions of the base 1, thereby completing a magnetic recording medium having the structure shown in the first figure. The magnetic film described above is made by depositing a thin film of, for example, cobalt, niracle, or silver-containing gold on the substrate 1 to a thickness of about 0.1 to 0.2 μm by electroless plating.
A protective film of 5i02 having a thickness of 0.01 .mu.m can be attached and formed at the following V.

As a right circular truncated cone-shaped base l, the diameter of its upper base 6 is 2.
5, the diameter of the lower base is 27wn, and the length of the generatrix is s4-, the original right circular cone has an apex angle of approximately 2 degrees. Further, the base 1 having the above-mentioned dimensional relationship has a side wall thickness of, for example, about 1.5 m+n.

In addition, in a magnetic recording medium made using a substrate having the above-mentioned dimensions, the difference in circumference between the top bottom surface 6 side and the bottom bottom surface 5 side is approximately 7%. The change in relative linear velocity between the magnetic head and the surface of the recording medium that should occur within the recording self-generating area is within 7 inches, and therefore, even if the external shape of the magnetic recording medium is not a right circular truncated cone, [111 FIG. 4 shows a state in which the magnetic recording medium A as shown in FIGS. 1 and 2 is coupled to a rotational drive mechanism. 4, 19 is a base;
8 is a motor support body, 11 is a motor, and bearings 15a,
15b A rotating plate 13 is fixed to the rotating shaft 12 of the motor 11 supported by K, and an annular permanent magnet 14 is fixed to the rotating plate 13.

Step 1: Insert the magnetic recording medium A into its hole 3 with the tip of the rotating shaft 12 of the motor 11, and then insert the JL 3 and the rotating shaft 1.
2 are fitted together, the permanent magnet 14 fixed to the rotating disk 13 and the retaining portion 4 of the soft iron film fixed to the upper bottom surface 6 of the base l of the magnetic recording medium A are magnetically attracted. Thus, the magnetic recording medium A is rotationally driven by the motor IK. It is clear from the description of other configuration examples described later that any coupling means other than the above-mentioned fill type adsorption means can be adopted as a mode of coupling the magnetic recording medium A and the rotational drive mechanism. .

In FIG. 4, 16 is a magnet, 17 is a coil, 1 and 2o are a light emitting element, and 21 is a light receiving element, and the light emitting element 20 and the light receiving element 21 are connected to a magnetic recording medium. A signal indicating the rotational phase of the magnetic recording medium A is generated when the through hole of the mark portion 7 provided at A is present between the two.

The magnetic recording medium A described above has a magnetic film 2.
This is inconvenient to handle, and the magnetic film is easily damaged, causing problems such as V- being exposed and exposed. The above problem can be solved by storing the magnetic recording medium A in the storage container B and converting it into a cartridge lithography system.

FIG. 5 is a perspective view of a magnetic recording medium A having an external shape of a truncated right circular cone, which is stored in a storage container B and converted into a cartridge lithography system, in which the internal structure is clearly shown. A part of the figure is shown broken down. Moreover, FIG. 6 is a longitudinal sectional view taken along the line X--X in FIG. 5.

In FIGS. 5 and 6, A is a magnetic recording medium, B is a storage container having an outer shape that is approximately similar to the magnetic recording medium A, and the magnetic recording medium A constitutes the storage container B. It is housed between the outer wall part 22 and the inner wall part 23.

The outer wall portion 22 and the inner wall portion 23 constituting the storage container B are preferably made of plastic molded products, and when the outer wall portion 22 and the inner wall portion 23 are separated and f, the outer wall portion 22 is After inserting the magnetic recording medium A into the hollow cavity with its top surface facing forward, the inner wall portion 23 is joined to the outer wall portion 22 at the joining portion 24.

In this state, in order to prevent the magnetic film surface of the magnetic recording medium A from coming into contact with the inner surface of the outer wall portion 22 of the storage container B and being damaged, as shown in FIGS. In the embodiment f, a protrusion 25 is provided on the outer peripheral side surface of the magnetic recording medium A on the lower bottom surface side, and a protrusion 76 is provided on the inner peripheral wall surface of the upper bottom surface side of the outer wall portion 22 of the storage container B. ing. The projections 25 and q6 described above may be annular projections or a plurality of discontinuously provided projections. 026 is a first slot bored in the outer wall 22 of the storage container B, and this slot 26 allows the magnetic head to pass through the magnetic field inside the storage container B. This is to enable contact with the magnetic film surface of the recording medium A. Therefore, the slot 26 is provided in a specific portion of the outer wall portion 22 over a predetermined length in the generatrix direction. 2
Reference numeral 7 designates a guiding protrusion f, which is provided on the outer periphery of the slot 26 described above. 5. The slot 26 in the outer wall 22 of the storage container B is
It is used to regulate the mounting position of the cartridge so that it correctly corresponds to the transfer area of the magnetic head provided on the device side, and is used to control the mounting position of the cartridge. A guide groove corresponding to the projection 27 described above is provided on the side.

A guide protrusion 28 is protruded from the inner wall 23 of the storage container B, and this guide protrusion 28 engages with a guide groove 30 (Fig. 7) provided in the rotary drive groove. It is used to control the mounting position of the cartridge. The guide protrusion 28 is provided with a hole 29 for determining the fixed position, and when the cartridge is properly installed in the rotational drive mechanism, the hole 29+ is provided.
A movable protrusion 31 provided in the guide groove 30 is fitted into the guide groove 30 to fix the cartridge. As the above-mentioned movable protrusion 31, a well-known structure using a pole biased by a spring can be used.

FIG. 7 is a perspective view showing a rotational drive mechanism and a magnetic envelope head transfer mechanism, and 32 is a holding part for the motor 11, and this holding part 32 has an outer shape of a truncated right cone. This makes it easy to install the cartridge when installing the cartridge lithography onto the rotational drive mechanism.

In Fig. 7, 33 is a transport motor, 34j is
A feed screw, 35 a guide rod, 36 a transfer body that meshes with the feed screw, 37 an actuator, 38 a magnetic head,
The magnetic head 38 is driven and displaced as required by the actuator 37. Further, 39 is a magnetic head forcible displacement mechanism fixed to the transfer body 36, which includes, for example, an electromagnet, and when the electromagnet is energized, the magnetic head 38 is moved to the outside of the cartridge. Evacuation f′
1. y, is brought into the − state.

This head forced displacement mechanism 39 is required to evacuate the white head 38 from the passage of the cartridge when loading the cartridge into the device or when removing the cartridge from the device. It is desirable to adopt a circuit configuration that automatically energizes the electromagnet of the magnetic head forced displacement mechanism before the cartino is moved as described above. LV-Embodiment.

FIG. 8 is a vertical cross-sectional view showing a state in which a magnetic recording medium made of cartrinon is attached to the rotational drive mechanism;
FIG. 9 is a longitudinal cross-sectional view showing an example of the structure of a device for generating a signal indicating the rotational phase of the magnetic recording medium A in a magnetic envelope manner. It is a detection coil (pick 7 knob coil).

Figure 1O shows that there is a gap between the magnetic recording medium A and the rotational drive mechanism, and this first
0, a rotary plate 13 fixed to a rotating shaft 12 of the motor is provided with a protrusion 13a that fits into the fitting hole 3 of the magnetic recording medium A. When the magnetic recording medium A is pushed into the rotation drive mechanism in a state that it is not inserted into the fitting hole 3 of the six-pack recording medium A, the current Eigen white stone 14 stuck to the rotating plate 13,
The magnetic recording medium A and the rotary drive mechanism are coupled by the soft iron suction plate 43 fixed to the upper bottom surface 6 of the base l to the m-pack recording medium by magnetic attraction. Sa V
It is done in a state of being. 42 in the figure is a ring made of ferromagnetic material for magnetic curl. Said 1ko (b) Turning plate 1
The contact between the upper surface of 3 and the lower surface of the top plate of the storage container reliably prevents surface wobbling.

/-2゜ Figures 11 and 12 are diagrams showing an example of the configuration of the magnetic head 38. In Figure 11, a thin film 45 of a Senalloy-based pot is sandwiched between polycrystalline ferrite plates 46 and 47 to form a magnetic path. configure,
In addition, near the magnetic gap 440, a ceramic plate 48,49 having high f abrasion resistance is used, and a thin film 4 of a sen-7g-based alloy is used.
Further, the curvature of the concave sliding contact surface with the magnetic recording medium A near the magnetic gap 44 is slightly smaller than the curvature of the minimum curvature part of the magnetic recording medium A. It is a magnetic head configured to have a long
0.51 is a coil.

FIG. 12 shows a magnetic head made of single crystal ferrite, and this magnetic head also has a magnetic recording medium A.
The curvature of the concave sliding surface is the same as that of the eleventh magnetic head.

In FIG. 12, 52 and 53 are glass horn puffer parts.

FIG. 13 is a longitudinal cross-sectional view showing another configuration of a magnetic recording medium that is converted into a cartridge by storing the magnetic recording medium A in the storage container B. , to prevent the magnetic recording medium A stored in the hollow cavity of the storage container B from escaping from the inside of the storage container B, and to prevent the magnetic recording medium A from escaping from the inside of the storage container B. This configuration is provided with a ring member 54 that serves as a guide when the medium is attached to the rotational drive mechanism. The above-mentioned ring member 54 and the outer wall portion 22 may be connected in any manner, but it is done by fitting the concave and convex portions formed on both sides as shown in FIG. 13. It's easy and good.

In practice, the storage container B may have any external shape or tongue; for example, a storage container with a cylindrical external shape or a square tubular external shape may be used. In addition, the manner of coupling the magnetic recording medium and the rotational drive mechanism is not limited to the coupling means using the magnetic envelope attraction force between the two as described above and in the first embodiment, for example, A thread is cut at the tip of the shaft, and a nut is engaged with it to connect the magnetic recording medium and the rotation drive mechanism. The rotation drive mechanism may be combined with the rotation drive mechanism.

7. Adoption of magnetic coupling means may also have any adverse effect on magnetic recording reproduction. First, if the coupling mechanism is used as a means for coupling the magnetic recording medium and the rotational drive mechanism, the above-mentioned magnetic adsorption effect is used.The coupling mechanism is simple in structure. 1 of 1
This is a particularly desirable implementation mode.

FIG. 14 shows that a pressing portion I, for example, a leaf spring 56 and a hole 57, is provided between the inner surface of the top plate 55 of the storage container B containing the magnetic recording medium A and the upper surface of the upper bottom surface of the magnetic recording medium A. It is fixed to the top plate 55 of the storage container B, is rotatably supported by a V-shaped leaf spring 56, and has a single hole 57 pressed against the magnetic recording medium A by the urging force of the leaf spring 56. By doing so, when the SZ recording medium converted into a cartridge is not connected to the rotational drive mechanism and is not connected to the rotation drive mechanism, the magnetic recording medium A is placed in the storage container B in the V state without wobbling.
5, the magnetic recording medium A is compressed to the coupling member 58 in the rotational drive mechanism by being housed in the storage compartment 1, so that rotational power can be smoothly transmitted from the rotational drive mechanism to the magnetic recording medium without slipping. It will be held on 5th. J: Make it 5.

At this time, the hole 57 biased by the leaf spring 56 is
Since the top surface of the magnetic recording medium A rotates in contact with the upper surface thereof, the presence of the suppressing member constituted by the plate spring 56 and the carbonyl 57 does not impose a large extra load on the rotational drive mechanism. f0 Figure 16 shows storage container BI71
3. When the magnetic recording medium containing the recording medium A and being converted into a cartridge is mounted on the rotational drive mechanism of the user device, the magnetic recording medium is installed in the user device to which the magnetic recording medium is to be installed. Due to the removal, the magnetic recording medium A in the storage container B is brought into pressure contact with the coupling portion 58 of the rotational drive mechanism, and the rotational power is efficiently transmitted from the rotational drive mechanism side to the magnetic recording medium A. This figure shows an example of the configuration of a magnetic recording medium as shown in FIG. 16, and the one shown in FIG. A hole 55a is drilled through the magnetic recording medium, and after the magnetic recording medium stored in the storage container B and not yet converted into a cartridge is mounted on the user device side, the pressing member 59 on the user device side is pressed. Hole 55 in top plate 55 of storage container B
a, and the magnetic recording medium is pressed by the tip thereof, and the magnetic recording medium is attached to the coupling part 5 of the rotational drive mechanism.
8 to ensure good transmission of rotational power from the rotational drive mechanism to the magnetic recording medium. 1st
As the suppressing part 59 shown in Figure 6, it is preferable to use one that has a rotatable hole at its tip, and the ball is biased by a spring. It is desirable that the configuration be V. Further, the above-mentioned suppressing member 59 is attached to the cover of the mounting hole on the usage device side, which is used when loading the magnetic recording medium converted into a cartridge into the usage device.
After inserting the cartridge-formed magnetic recording medium into the mounting hole of the user device, the lid of the mounting hole is closed, and at the same time, the magnetic recording medium A in the storage container is attached to the lid. Kf is brought into pressure contact with the coupling member 58 of the rotational drive mechanism by the pressing member 59.

(Application Example) In the magnetic recording medium of the present invention, a substrate having a mirror-like outer circumferential side surface on which a thin film of a magnetic material with high resistance force, which can easily realize high-density recording, is to be formed as a magnetic film is It has the outer shape of a right circular truncated cone with a small apex angle, and is made of thin plastic molded into a hollow barb shape, making it highly suitable for mass production. A compact magnetic recording medium that is made into a cart so that it can be easily stored in a storage container and handled at home can be effectively used as a recording medium for small imaging and recording devices such as electronic cameras. Therefore, the magnetic recording medium of the present invention can be effectively used for high-density recording of differential information in place of the conventional so-called flat disk. It is useful for downsizing the form of the -RF- device because it can be attached to the utilization device in such a state that a one-turn drive mechanism for rotationally driving the magnetic recording medium is placed on the barb-like part. It is.

FIG. 17 is a transparent perspective view showing an example of the configuration of an electronic camera using the magnetic recording medium of the present invention. In FIG. 17, 60 is a lens, and 61 is a The half mirror 162 is, for example, a CCD image sensor J-5.
63 is a reflecting mirror, 64 is an optical viewfinder, and σ) light from the subject passes through a lens 60 and a mirror 61 to the solid-state image sensor 62, as shown by the dashed line in the figure. The solid-state image sensor 62 generates a video signal (image signal) corresponding to the image of the subject, which is not applied to the photoelectric conversion unit.

In addition, some of the light reflected by the -.-7 mirror 61 and -1,- is reflected by the 5-reflecting mirror 63 and given to the optical viewfinder 4, where the image of the subject can be confirmed by the WGII operator. I'll give it a 5. 65 is a battery that supplies operating power to the electronic camera, 66 is a circuit board, 67 is a /YACK button, 68 is an operation switch, and 69 is a release button.

70 is a cartridge lithography system in which the recording medium is stored in the storage container B in a flat state.
, an opening for inserting and mounting a magnetic recording medium into the housing of an electronic camera, and for taking it out from the housing;
1 is an opening/closing lid provided in the opening 70, and this opening/closing lid 71 has a suppressing member 72 (a spring 72 in the illustrated example).
is provided. Further, 38 is a displacement head, 39 is a magnetic force displacement mechanism, 37 is an actuator, and 33 is a morph provided in the transfer mechanism of the magnetic head. During the recording operation, the magnetic recording medium stored in the storage container B for one magnetic recording medium that has been subjected to cart lithography is rotated according to the vertical scanning standard in the W system applied to signal recording. It rotates at high speed.

First, in a stationary state, the tip of the magnetic head 38 comes into contact with the surface of the magnetic film of the magnetic recording medium A through the through hole 26 provided in the vertical direction in the figure on the side surface of the storage container. In the state where they are in contact with each other, the recording head 38 is continuously or intermittently transferred by the transfer mechanism of the magnetic recording medium, thereby forming recording marks having a predetermined interval between recording marks on the magnetic film of the magnetic recording medium. J is formed every rotation of the magnetic recording medium.
Due to the recording trace, a video signal with a time length of one vertical period or a vertical period twice as long as the vertical period is recorded.

In this way, a recording device using the m6 recording body of the present invention,
By configuring a self-recording device, it is possible to easily provide an ultra-compact electronic camera as shown in Fig. 17, and other small-sized utilization devices 2).

(Effects) As is clear from the above detailed explanation, the present invention has an external shape of a truncated right circular cone, which is similar to the original right circular cone having a small apex angle, and has a hollow, spiky shape. A magnetic film is formed on the mirror-like outer circumferential side of a thin plastic base that is molded into 11. An engagement part with the rotation drive mechanism is provided on the upper bottom side so that the magnetic recording medium having a single screw structure and the sleeve can be rotated in the storage container without contacting the wall of the storage container. By using a molded plastic product as a base, it has a surface roughness of, for example, about 0801 μm and a mirror-like outer circumferential surface, so that a magnet with high coercive force is Magnetic recording media capable of high-density recording can be easily mass-produced by depositing a thin film of Bamboo on the outer peripheral surface, and when the magnetic recording medium is installed in a device, the magnetic recording medium By arranging the 1q rotation driving mechanism for the magnetic recording medium in the hollow part of the magnetic recording medium, it is easy to downsize the recording device or the recording/reproducing device. Not only can it be effectively used as a magnetic recording medium for small-sized imaging and recording devices such as electronic cameras, but it can also be used as a magnetic recording medium for recording digital information to easily achieve miniaturization of devices. can.

In addition, by providing the magnetic recording medium with a mark section for generating a signal indicating the rotational phase, even if the magnetic recording medium is mounted in an appropriate phase relationship with respect to the rotational drive mechanism of the Jl, the recording signal will not be detected. A specific part (for example, a vertical synchronization signal part when the recording signal is a ■ signal) can be recorded in a certain area including a specific bus line on the magnetic recording medium, and therefore, it is possible to record a specific part (for example, a vertical synchronization signal part when the recording signal is a ■ signal) in a certain area including a specific bus line of the magnetic recording medium. If continuous shooting is performed while the attachment/detachment operation is repeated, the amount of recorded images can be easily changed, and a stable endogenous image can be obtained.

Furthermore, since the storage container that stores the magnetic recording medium is provided with a guide part for regulating the mounting position, when the magnetic recording medium is installed in the usage device, it is difficult to install the magnetic recording medium on the usage device side. Since the slot for protruding the magnetic head in the storage container is located at a position that exactly corresponds to the transfer range of the magnetic head, it is extremely easy to attach the recording medium to the equipment used. Become.

As described above, according to the present invention, it is possible to easily provide a magnetic recording medium that is mass-producible and capable of high-density recording, and it is also possible to reduce the size and weight of devices that use the magnetic recording medium of the present invention. It has the advantage of being easy to achieve.

[Brief explanation of drawings]

1 and 5 are perspective views of different embodiments of the magnetic recording medium of the present invention, and FIGS. 2, 6, 13, and 14 are perspective views of respective embodiments of the present invention. FIG. 3 is a vertical cross-sectional view for explaining the mold for molding the base, FIGS. 4, 8, 5, 1θ, 15, and 16 are magnetic recording media. FIG. 7 is a perspective view of the rotary drive mechanism, FIG. 9 is a longitudinal cross-sectional view showing an example configuration of the rotary phase signal generator, FIGS. Figure 12 is a perspective view of the magnetic head;
FIG. 17 is a transparent perspective view of an example configuration of an electronic camera. A... Magnetic recording medium, B... Storage container, l... Substrate, 2... Magnetic film, 4... Engaging portion, 5... Lower bottom surface, 6... Upper bottom surface, 7...Mark part, 8...Male type,
9...female type, 10...inlet, 11...-Tanaichiba,
12...Rotating axis, 14...Permanent magnet of theory, 18...
- Tanabata support, 19... base, 26... slot, 2
7.28...Guiding protrusion, 3o...Guiding groove, 33...
・Motor for transfer, 34...Feed screw, 35...Guide rod ~ 36...Transfer body, 37...7 mouth □eta, 3
8 magnetic envelope head, 39...forced displacement mechanism of magnetic head, 4
o. Magnet, 41... Detection coil, 54... Ring member, 55... Top plate, 56. Leaf spring, 57...
Pole, 58... coupling member, 59... suppressing member, =257

Claims (1)

[Scope of Claims] 1. A thin plastic material having an outer shape of a right circular truncated cone, such that the original right circular cone has an apex angle of ``f'', and is molded into a hollow thorn-like shape. σ) A mirror-like outer circumferential side surface of the base body [61?] is formed with an attached film, and the bottom side of the base body is open and the top side of the base body is connected to a rotational drive mechanism. The first magnetic recording medium 2 provided with the engaging portion has an outer shape of a truncated right circular cone, such that the original right circular cone has a small apex angle, and is molded into a hollow barb shape. A magnetic film is attached to the mirror-like outer peripheral side of a thin plastic base that can be bent, and the bottom side of the base is open C1/-, and the top side of the base is open. A retaining part for the rotational drive mechanism is provided, which includes a magnetic adsorption part made of a solid material, and furthermore, a part of the base body is provided with a part that controls the rotational phase of the base body. A magnetic recording medium 3 is provided with a mark portion for generating a signal indicating the signal, and has an external shape of a truncated right circular cone, similar to the original right circular cone having a small apex angle, and has a hollow spiky shape. A magnetic film is attached to the mirror-like outer circumferential side of a thin plastic base that is molded into a thin plastic base, and the bottom side of the base is open and the top side of the base is open. is a magnetic recording medium that is provided with a retaining part with a rotational drive mechanism,
1. A magnetic recording medium which is made of a cartonized material and is comprised of a tongue and a cartridge which is rotatably driven in a storage container in a non-contact state with respect to the wall of the storage container. The container for accommodating the storage container has a hollow barb shape and has an opening at at least one end. The storage container also has a magnetic head protrusion that extends over the moving range of the magnetic head that slides into contact with the magnetic film of the recording medium stored in the storage container. A magnetic recording medium 4 that uses a slotted hole and a guide portion for regulating the mounting position when the magnetic recording medium is mounted on a single rotation drive mechanism. , The external shape of a right circular truncated cone is similar to that of the original right circular cone with a small apex angle, and the mirror-like outer peripheral side surface of a thin plastic base is molded into a hollow thorn-like shape. m
The sexual membrane is attached and formed, and the bottom side of the base is open, and the top side of the base is not provided with an engagement part with the rotational drive mechanism. A magnetic recording medium is rotatably driven in a storage container in a non-contact state with respect to the wall of the storage container. Media is "C11"
A storage container for storing a commercially available recording medium has an outer shape that is approximately the same as the outer shape of the magnetic recording medium (2), and at least a portion thereof has an outer circumferential side surface and an inner circumferential surface of the magnetic recording medium. It is provided with a wall portion facing at least a part of the side surface with a gap therebetween, and is arranged so that a magnetic recording medium is housed between the two wall portions. 1. The storage container is stored in it, and the end side that is connected to the lower bottom side of the recording medium is left open to expose the internal cavity, and further, The outer wall of the storage container has a J that slides into contact with the magnetic film of the first magnetic recording medium stored therein.
A groove L for protruding the magnetic head 1 is drilled in the moving range of the magnetic head 1, and a magnetic recording medium is mounted in the storage container for the rotational drive mechanism. Use a device that is equipped with a guide section to control the mounting position when the recording medium is mounted on the drive mechanism. , the magnetic recording medium is rotationally driven in the storage container in a non-contact state with respect to the wall of the storage container.