JPS61153174A - Coating device - Google Patents

Abstract

PURPOSE:To produce the magnetic disc of a thin film which has a smoothly coated film surface and a faultlessly coated film by providing an air supply port in order to fill the inside of a chamber with a solvent atmosphere. CONSTITUTION:In the vertical coating device of the magnetic disc, an Al substrate 1 for the magnetic disc is fitted to a spindle 2 in a vertical state and clamped by a cap 3. A magnetic paint is ejected through the nozzles 4, 5 to coat the top and under surfaces of the substrate 1. In such a stage, since the rotation of a motor 6 is transferred to the spindle 2 to rotate the substrate 1, the excess magnetic paint on the substrate 1 is flung away by the centrifugal force to form a magnetic film having the same thickness on both surfaces. In such a case, a solvent atmosphere is supplied through the air supply ports 9, 10 provided on the chamber 8 and the degassing is executed through the exhaust ports 11-14. Furthermore the solvent evaporation is performed by the steam bottles 19, 20 to send the vapor atmosphere into the chamber 8. The flying paint is removed from the discharged air and circulated to the air supply ports 9, 10 from the exhaust ports 11-14.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to magnetic film formation in magnetic disk manufacturing,
In particular, the present invention relates to a magnetic disk vertical coating device suitable for simultaneously coating both sides of a magnetic disk substrate with magnetic paint.

[Background of the invention]

The re-deposition prevention mechanism for scattered paint during vertical coating is achieved by providing an inlet with an annular opening as described in Japanese Patent Application Laid-Open No. 59-7B656. was inhaled and expelled. but,
No consideration was given to the flow (return) of the solvent/steam atmosphere.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a coating apparatus for producing a thin magnetic disk with a smooth coating surface and no coating defects.

[Summary of the invention]

Hold the magnetic disk substrate vertically and apply magnetic paint.
K solved the problem of redeposition of scattered paint, which was a problem with the vertical coating method for forming a magnetic film, by providing an inlet with an annular opening. However, with this coating method, a problem arose in that the solvent in the coating film evaporated quickly and the coating surface became rough.

On the other hand, consideration of thinning the film is also becoming increasingly important. Therefore, in order to achieve the above object, the present invention is characterized in that a solvent/steam atmosphere is supplied into the chamber.

The solvent/vapor atmosphere can be supplied into the chamber by providing a solvent supply port and by evaporating the solvent from an evaporation bottle k. Furthermore, by removing resins and pigments from the paint splatter from the exhausted air and returning the solvent atmosphere in the paint splatter to the chamber, it is possible to create a smooth coating surface and a defect-free film. It is possible to make thin magnetic disks. Here, the displacement is adjusted by the airflow caused by the rotation of the magnetic disk itself, and since the rotation is fast, the easier the solvent evaporates, the more the solvent atmosphere is promoted, resulting in better results.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG.

Aluminum substrate 1 for magnetic disk is held vertically.

Attach it to the spindle 2 and fix it with the cap 5. Magnetic paint is discharged from the nozzle 4.5 and applied to the upper and lower surfaces of the aluminum substrate 1 for magnetic disk. The rotation of the motor 6 is transmitted to the spindle 2 through the drive of the belt 7, and rotates the aluminum substrate 1 for magnetic disks, so that the excess magnetic paint on the aluminum substrate 1 for magnetic disks is shaken off by centrifugal force, and both sides are A magnetic film of the same thickness is formed on both sides.

In this case, a solvent atmosphere is supplied to the chamber 8 through the provided air supply port 9.10, and degassing is performed through the exhaust port 11.12+'5s14. Furthermore, the solvent is evaporated using the steam bottle 19.degree. 20, and a steam atmosphere is sent into the chamber 8. Then, the resin and pigments in the paint scattering are removed from the exhausted air, and the gas (solvent atmosphere) in the paint scattering is passed from the exhaust ports 11, 15, 14 through the exhaust sag) 15, 16 into the air supply provided in the chamber. The air is circulated through the air ports 9 and 10 K and returned to the chamber 8 for supply. Therefore, a magnetic disk with a smooth coating surface can be produced. Furthermore, the scattered paint does not adhere to the upper and lower surfaces of the magnetic disk aluminum substrate 1.

〔Effect of the invention〕

According to the present invention, the inside of the chamber can be filled with a solvent atmosphere, and after the solvent is evaporated, a vapor atmosphere can be sent into the chamber. In addition, it is possible to remove resins and pigments from paint splatters from the exhausted air and return the solvent atmosphere in the paint splatters to the chamber, resulting in a smooth coating surface and a thin magnetic film with no defects. We can manufacture discs. In other words, magnetic disks can be produced with high quality and high yield.

[Brief explanation of the drawing]

FIG. 1 is a side view of a coating device according to an embodiment of the present invention. 2...Spindle, 5...Cap, 4,5...
Nozzle, 6...Motor, 7...Belt, 8...Chamber, 9.10...Air supply port, 11, 12...
Exhaust port I, 15.1a...Exhaust port ■, 15, 16.
...Exhaust duct, 17...Spindle support, 18.
...Paint drop port, 19.20... Evaporation bottle.

Claims (1)

[Claims] 1. A coating device characterized in that an air supply port is provided to fill the chamber with a solvent atmosphere.