JPS606033B2 - magnetic sheet recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic sheet recorder, and particularly to improvements in holding means for a magnetic sheet and a magnetic head.

The magnetic sheet referred to in the present invention consists of a magnetic layer and a supporting substrate, and if necessary, a protective layer is applied to the surface of the magnetic layer, and an antistatic layer or a running stabilizing layer is also applied to the supporting substrate if necessary. It is made up of. The shape of the magnetic sheet is usually a donut shape, but other shapes such as an ellipse, a rectangle, a square, or other irregular shapes are also used.

When used in a donut shape, the outer diameter is generally 10 skins to 5 skins.
There are many 0 skins, and the inner diameter is often between 3 sides and 5 sides. Materials for the support include polyesters such as polyethylene terephthalate and polyethylene-2,6-naphthalate, polyolefins such as polyethylene and polypropylene, and cellulose.

Used in addition to cellulose derivatives such as diacetate, cellulose triacetate, cellulose acetate/ptylate, and cellulose acetate propionate, vinyl resins such as polyvinyl chloride and polyvinyl chloride 1" den, and plastics such as polycarbonate, polyimide, and polyamideimide. Non-magnetic metals such as aluminum and copper, depending on the
Ceramics such as glass, earthenware, and porcelain, paper, baryta, or paper coated with or laminated with Q-polyolefin having 2 to 10 carbon atoms such as polyethylene, polypropylene, and ethylene-butene copolymer are used. The support is transparent or opaque depending on the use of the magnetic recording medium, and is flexible and non-magnetic with a thickness of 3 to 1000 mm.On the other hand, the magnetic layer is Publication No. 44-11409, Publication No. 45-18372, Publication No. 4
No. 7-22062 "No. 47-22513 to No. 46-
No. 28466, No. 46-38755, No. 47-428
y-Fe203, Co-containing y-Fe203, Co-containing y-
Fine ferromagnetic powder such as Fe203, Fe304, Co-containing Fe304, Co-Ni-P alloy, Fe-Co-Ni alloy, etc. is mixed with conventionally known thermoplastic resin, thermosetting resin, reactive type. A binder consisting of a resin or a mixture thereof, additives such as a dispersant, a lubricant, an abrasive, etc., and an organic solvent are mixed and dispersed to create Magnetic 71 Coating Liquid. Air doctor coat, plaid coat, air knife coat, squeeze coat, dip coat, reverse roll coat, transfer roll, which are described in detail in "Coating Engineering" pages 253 to 27 (Takayuki Susumu, March 2, 1972). Coat ``Coat'' is formed by applying the magnetic coating liquid onto the support by gravure coating, kiss coating, cast coating, spray coating, etc., and its thickness varies depending on the application, but is generally 0.5 mm thick. Most of the thermoplastic resins have a softening temperature of 150°C or less, an average molecular weight of 10,000 to 20,000, and a degree of polymerization of about 200 to 5.
0 bait prevalence, such as vinyl chloride vinyl acetate copolymer, vinyl chloride vinylidene chloride copolymer, vinyl chloride acrylonitrile copolymer, acrylic acid ester acrylonitrile copolymer, acrylic acid ester vinylidene chloride copolymer toacryl Acid ester styrene copolymer
methacrylic acid ester acrylonitrile copolymer, methacrylic acid ester vinylidene chloride copolymer, methacrylic acid ester styrene copolymer, urethane elastomer, polyvinyl fluoride-vinylidene chloride acrylonitrile copolymer, ptadiene acrylonitrile copolymer Polymers, polyamide resins, polyvinyl butyral, cellulose derivatives (
cellulose acetate butyrate, cellulose diacetate, cellulose triacetate, cellulose propionate, nitrocellulose, etc.), styrene ptadiene copolymer, polyester resin, chlorovinyl ether acrylate copolymer, amino resin, various synthesis Rubber-based thermoplastic resins and mixtures thereof are used.

These resins are disclosed in Japanese Patent Publications Nos. 37-6877 and 39-11.
No. 2528, No. 39-19282, No. 40-534y
No. 40-20907, No. 41-9463, No. 4
No. 1-1405, No. 41-16985, No. 42-6
No. 428, No. 42-11621, No. 43-4623, No. 43-15206, No. 44-288, No. 44
No. 117947, No. 44-18232, No. 45-14
No. 020, No. 45-1450, No. 47-18573
No. 47-22063, No. 47-22064
No. 47-22068, No. 47-22069, No. 4
It is described in publications such as No. 7-2207 and No. 47-27886.

As a thermosetting resin or a reactive resin, it has a molecular weight of 2×1 or less in the state of a coating solution, and when heated after coating and drying, the molecular weight becomes infinite due to reactions such as condensation and addition. .

Also, among these resins, those that do not soften or melt before the resin is thermally decomposed are preferred, and specific examples include phenol resins, epoxy resins, polyurethane curable resins, urea resins, melamine resins, and alkyd resins. Resins: silicone resins, acrylic reactive resins: epoxy-polyamide resins, nitrocellulose melamine resins, mixtures of polymeric polyester resins and isocyanate prepolymers, mixtures of methacrylate copolymers and diisocyanate prepolymers, polyester polyols and polyisocyanate mixtures, urea formaldehyde resins, mixtures of low molecular weight glycol/polymer diolnotrifenylmethane triisocyanates, polyamine resins, and mixtures thereof.These resins are disclosed in Japanese Patent Publication No. 39-8103, No. 40-1977y, No. 41-7192, No. 41-
No. 8016, No. 41-14275, No. 42-181
7 number, No. 43-12081, No. 44-28023, No. 45-14501, No. 45-24902, No. 4
No. 6-13103 “No. 47-2065, No. 47-2
No. 2066 “No. 47-22067” No. 47-220
No. 72, No. 47-22073 “No. 47-28045
No. 47-28048, No. 47-28922, and the like.

Conventionally, a magnetic sheet recorder (hereinafter referred to as "VSR") that magnetically records or reproduces information using a D circular or spiral track on a magnetic sheet, as shown in FIG. A stator 6 is attached to the threaded portion 5 in order to hold the area around the central entrance portion 23 of the magnetic sheet 10 on the upper end portion of the output rotating shaft 4 of the motor 3 that passes through the opening portion 2 from below.
After that, the motor 3 is started to rotate the magnetic sheet 10 around the rotating shaft 4, and as the magnetic sheet IQ rotates, the fixed part is opened from the central opening 2. When the magnetic sheet 10 is floated above the fixed substrate 1 by the action of the cushion pressure and centrifugal force of the airflow A flowing onto the substrate 1), head holding means disposed below the fixed substrate 1 A magnetic head 8 is held by a magnetic head (not shown) and penetrates from below through a hole 7 that is transparent in the radial direction.
Magnetic recording or reproduction was performed by bringing the magnetic sheet into contact with the magnetic layer 12 provided on the lower surface of the support 11 of the magnetic sheet 10. Note that when the magnetic layer 12 is disposed on the upper surface of the support 11, the magnetic head 8 is held by another head holding means (not shown) disposed above the magnetic sheet 10. Then, the magnetic head 8 was brought into contact with the magnetic layer 12 from above to perform magnetic recording or reproduction.

The characteristic of the conventional VSR described above is that while the magnetic sheet io is rotated about the rotating shaft 4, the magnetic head 8 held by the head holding means is rotated continuously or intermittently in the radial direction of the magnetic sheet 10. The purpose of this method was to record or reproduce magnetically in a circular or spiral shape by moving the magnetic head.

However, the conventional VSR described above has the following drawbacks.

■Due to its structure, it is difficult to precisely adjust the static and dynamic balance, and magnetic recording or reproduction is performed by rotating the magnetic sheet, which is relatively flexible, so uneven rotation of the magnetic sheet is avoided. Jitt
In some cases, a problem called er) in which the reproduction output fluctuates greatly over time occurs one after another.

■ In addition, in order to alleviate the uneven spread of the magnetic sheet to some extent and prevent deformation and damage around the central opening, reinforcing linings may be fixed around the central opening, or the outer periphery may be It is necessary to fix the balance ring in the area,
This has made it difficult to reduce the production cost of the magnetic sheet.

(2) Furthermore, the fixed substrate is likely to be heated by the heat generated by the motor, and therefore, the heat flowing through the fixed substrate heats the magnetic sheet and causes curling, making the touch of the magnetic head uneven.

SUMMARY OF THE INVENTION An object of the present invention is to provide an improved VSR that eliminates the drawbacks of the conventional VSR described above and has a more stable reproduction output.

The object of the present invention is to provide a head holding means in which the central part of the substrate is attached to a rotating shaft so that the magnetic head can be held and rotated freely; It consists of a sheet holding means capable of holding the
A magnetic sheet record characterized in that magnetic recording or reproduction is performed on the magnetic sheet fixed to the sheet holding means by the magnetic head rotating about the rotation axis.
This is achieved by da. Hereinafter, embodiments of the apparatus of the present invention will be described in detail based on the attached FIGS. 2 and 3.

In FIG. 2, 20 is a head holding means, which includes a motor 21, an output rotation shaft 22 of the motor 21, and the rotation shaft 2.
2, a substrate 23 whose central portion is pivoted to the substrate 2, and which can be spread freely;
The magnetic head 24 is held by the substrate 3 and has its upper end surface slightly protruding from the upper surface of the substrate 23.

The substrate 23 is provided with a plurality of ventilation holes 25 around the central portion which is connected to the rotation shaft 22.

The magnetic head 24 also has a lead wire 28 connected to a terminal 27 which is connected to a rotary joint mechanism 26 mounted on the rotating shaft 22, for example, a power supply joint mechanism consisting of a slip ring and a slider.
to the substrate 23) are always electrically connected to the magnetic recording circuit or the reproducing circuit even when both are rotated. Further, the substrate 23, which has its central portion fixed to the rotary shaft 22 to which the rotary joint 26 and the terminal 27 are attached, further holds the magnetic head 24, and has the vent hole 25 formed therethrough, is relatively free in shape. A balancing weight is fixed at an appropriate position on the lower surface of the machine to precisely adjust its static and work balance. 30' is a head holding means, and is held by a moving mechanism (not shown) so as to be movable in the center direction of the rotating shaft 22 and in the radial direction of the substrate 23, respectively; It comprises a stator 33 that can be freely screwed onto a threaded portion 32 protruding from the lower end of the shaft member 31, and is disposed above the head holding means 20.

Next, the effect will be explained.

First, the magnetic sheet 1 with the magnetic layer 12 disposed below
0 is fixed to the lower end of the fixed shaft part village 31 by the screw part 32 and stator 33, and then the moving mechanism (
(not shown) to bring the lower end of the fixed ball member 31 close to the upper surface of the board 23.

As described above, when the magnetic sheet 1 is held around the center entrance part '3 by the fixed shaft member 31, the outer part of the magnetic layer 12 hangs down to the upper surface of the substrate 23 and comes into slight contact with the motor 21. By starting the board 2
3 begins to spread around the rotating shaft 22, an air flow A flows into the upper surface of the substrate 23 from the vent hole 25, a thin air film is formed on the substrate 23, and the air film becomes a cushion. Due to the pressure, the vicinity of the outer periphery of the magnetic layer 12 floats along the upper surface of the substrate 23.

When the magnetic sheet 10 floats along the upper surface of the substrate 23, the magnetic head 24', which rotates with a constant radius around the rotating shaft 22 (both the substrate 23) and the magnetic sheet 10, Smooth sliding contact with layer 12.

When the center of the magnetic sheet 0 is fixed at a position that coincides with the axis of the rotating shaft 22, the magnetic head 24, which is laid in contact with the magnetic sheet 101, connects the rotating joint 26, the terminal 27, and the lead wire. The recording signal transmitted through the magnetic layer 28 is magnetically recorded on the magnetic layer 2 using a circular track, or the circular track is traced and reproduced.The magnetic layer 12 has different radii. When magnetic recording or reproducing is performed using a circular or spiral track, the center of the magnetic sheet 18 is moved intermittently in the radial direction from the axis of the rotating shaft 22 within a range where the floating of the magnetic sheet 10 does not become extremely unstable. ``Slide the magnetic head 24 on the magnetic layer 12 while moving the magnetic head 24 at a target or continuously.

When the magnetic sheet IQ needs to move a long distance in the radial direction, if a vent hole 34 is provided through the fixed shaft member 31 as shown in FIG. The imbalance in the cushion pressure distribution of the air film caused by this is corrected by the air flow B sent to the upper surface of the substrate 23 through the front air vent 34, so that the magnetic sheet 1 moves while stably floating. .

As described above, even if the center of the magnetic sheet 10 is fixed to match the axis of the rotating shaft 22 or moved in the radial direction, the static and dynamic balance of the substrate 23 is precisely adjusted. The magnetic head 24 rotates about the rotating shaft 22 without causing uneven rotation which causes the jitter described above, and therefore the magnetic head 24 also comes into sliding contact with the magnetic layer 12 at a uniform circumferential speed.

Further, the heat transferred from the motor 21 to the substrate 23 is absorbed and dispersed by the airflow moving along the surface of the substrate 23 as the substrate 23 rotates, thereby preventing the magnetic head 24 from touching it. Smooth the curls with the magnetic sheet 1
01 will not occur.

Note that when the sheet holding means 301 is provided with the vent holes 34, the number of vent holes 25 of the head holding means 20 may be reduced to one depending on the floating state of the magnetic sheet io. It is possible.

The apparatus of the present invention described above has the following novel effects.

(2) Since the substrate 23 holds the magnetic head 24 and rotates about the rotation axis with static and dynamic balance adjusted, the magnetic head 24 rotates evenly and uniformly with respect to the magnetic layer angle 2. It became possible to make sliding contact at a controlled circumferential speed, and it was possible to obtain stable playback output.

(2) Since the substrate 23 is laid around the rotating shaft 24, the heat from the motor 21 is transferred to the substrate 2 as it rotates.
It is absorbed and dispersed by the air flow generated near the surface of 3.
The magnetic sheet 10 is prevented from curling due to the heat of the motor 21, and as a result, the touch of the magnetic head 24 is made smoother, and the reproduction output is further stabilized.

■ The magnetic sheet 10' is held by the sheet holding means 3, but does not rotate, so that deformation or damage around the central closing portion 13 does not occur, and the static and dynamic balance is precisely maintained. Since there is no need for adjustment, it is possible to further simplify the production process of the magnetic sheet 10 and reduce costs.

[Brief explanation of drawings]

FIG. 1 is a partially cut-away front view of a conventional VSR, FIG. 2 is a partially cut-away front view of an embodiment of the present VSR, and FIG. 3 is a partially cut-away front view of an embodiment of the present VSR. FIG. 7 is an enlarged cross-sectional view of a modified example of the sheet holding means. 10 is a magnetic sheet, 11 is a support, 12 is a magnetic layer, 20
2 is a head holding means, 22 is a rotating shaft, 23 is a substrate, 24 is a magnetic head, 25 is a vent, 30 is a sheet holding means, 3
1 is a fixed viewing member, 33 is a stator, 34 is a vent, and A and B are airflows. Fig. 1 Fig. 2 Fig. 3

Claims (1)

[Scope of Claims] 1. In a magnetic sheet recorder, a magnetic sheet recorder includes a head holding means in which a center portion of a substrate is pivotally attached to a rotating shaft so as to hold a magnetic head and rotate freely, and a fixed shaft member and a stator to hold a magnetic sheet. a sheet holding means capable of holding the periphery of the central opening, and performing magnetic recording or reproduction on the magnetic sheet fixed to the sheet holding means by the magnetic head rotating about the rotation axis. A magnetic sheet recorder featuring: 2. The magnetic sheet recorder as set forth in claim 1, further comprising the head holding means having at least one ventilation hole provided around the center of the substrate which is pivotally attached to the rotating shaft. A magnetic sheet recorder, characterized in that an airflow passing through the ventilation hole as the substrate rotates causes a pre-air magnetic sheet held by the sheet holding means to float along the upper surface of the substrate. 3. The magnetic sheet recorder according to claim 1 or 2, further comprising the sheet holding means having a vent hole penetrating the fixed shaft member, and the sheet holding means having a vent hole penetrating through the fixed shaft member, the sheet holding means is provided with a vent hole penetrating the fixed shaft member, and as the substrate rotates, the magnetic sheet recorder A magnetic sheet recorder characterized in that the magnetic sheet held by the sheet holding means is made to float along the upper surface of the substrate by an air flow passing through a vent.