Photomagnetic recording medium and film forming method

Details Photomagnetic recording medium and film forming method Photomagnetic recording medium and film forming method

1998-08-21

2001-01-23

Kiliman, Leszek (Department: 1773)

Coating processes

Direct application of electrical, magnetic, wave, or...

Chemical vapor deposition

C427S128000, C427S129000, C427S130000, C427S596000, C427S599000, C428S690000, C428S690000, C428S690000, C428S900000

Reexamination Certificate

active

06177150

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a film forming method for forming a diamond-like carbon film on an object, such as the above-mentioned magneto-optical recording medium, by RF plasma CVD.
2. Description of the Related Art
Up to now, a light modulation system or a magnetic field modulation system has been used as a recording system for the magneto-optical recording medium. With the magnetic field modulation system, an objective lens
49
for laser light radiation and a magnetic head modulation head
48
are arranged floating over a magneto-optical disc
50
, as shown in FIG.
1
.
With the magnetic field modulation system, the current allowed to flow through the magnetic head modulation head
48
is varied, at the same time as the laser light beam is continuously illuminated on the disc, for varying the magnetic field for overwriting new signals irrespective of the direction of magnetization of the recorded signals.
Referring to
FIG. 2
, the magneto-optical disc
50
has, as a recording layer
56
, a dielectric film
52
, a magnetic film
53
, a dielectric film
54
and a reflective film
55
, layered in this order on a polycarbonate substrate
51
. On the reflective layer
55
is further layered a photocurable resin
57
, such as UV curable resin, for preventing corrosion of the recording layer
56
.
Although the magnetic field modulation head
48
and the magneto-optical disc
50
are out of contact with each other, they are proximate to each other, so that some external force occasionally gives rise to physical contact between the magnetic field modulation head
48
and the magneto-optical disc
50
. There are also occasions wherein the foreign matter is intruded into a space between the magnetic field modulation head
48
and the magneto-optical disc
50
. In such case, the photocurable resin
57
directly transmits the impact caused by contact of the disc with the magnetic field modulation head
48
or by intrusion of foreign matter to the recording surface
56
.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a magneto-optical recording medium whereby the recording layer may be prevented from impact caused by, for example, contact of the disc with the magnetic field modulation head
48
.
It is another object of the present invention to provide a magneto-optical recording medium whereby the diamond-like carbon film may be prevented from being peeled from the recording layer for protecting the recording layer for a prolonged time.
It is yet another object of the present invention whereby the diamond-like thin carbon film formed on the object surface may be prevented from being peeled for protecting the object surface for a prolonged time.


REFERENCES:
patent: 5364690 (1994-11-01), Takahashi
patent: 5637373 (1997-06-01), Hayashi
patent: 5637393 (1997-06-01), Ueda

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