JPS58175151A - Recording medium - Google Patents

Abstract

PURPOSE:To form a recording medium provided with both functions of a protection film and a label, by using a photocuring ink to print the protection film on an information recording medium of the optical reflection system. CONSTITUTION:Prescribed information is recorded as a change of a geometrical shape on the surface of a substrate 1. A thin reflective film 2 consisting of a metal such as Al, Cr, or the like is provided on the recording face of the substrate 1. The photocuring ink is applied by spray, a roll coater, or the applying method such as a spinner method, and this applied film is irradiated with light and is cured to form a protection film 3, that is, characters, pictures, or the like displaying contents of recorded information of the video disc are printed by a screen or offset printing method or the like to obtain the protection film 3. Since the photocuring ink which is constituting materials of the protection film 3 has a sufficient close adhesion property to the reflective film and is superior in weather resistance, the protection film 3 functions as a protection film sufficiently, and undercoating and topcoating are unnecessary.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording medium, and the protective film of an optically reflective information recording medium is printed using a photocurable ink, thereby making it possible to separate the protective film of the recording medium and the label. The purpose is to provide a recording medium that has both functions.

For example, optically reflective video disks currently being proposed include a reflective film made of a metal such as A or Or on the recording surface of an acrylic resin substrate on which information is recorded as changes in geometric shape. A thin protective film made of, for example, the same material as the substrate is provided on the surface, and a paper label displaying the contents of recorded information is further affixed to the surface of the protective film.

However, such video discs require an extra adhesion process such as attaching a paper label, which not only makes manufacturing the video disc complicated and expensive, but also increases the quality of the label paper and the adhesive bonding of the label paper. Depending on the adhesive used to make the video disc (video disc); it will have a big impact on the headline. In other words, when a video disc is left in the atmosphere, the label paper and adhesive absorb moisture from the atmosphere, resulting in large warping of the video disc, and this warping greatly reduces playback of the video disc. I have discovered that it is something that can make you do something. Furthermore, the reflective film may be attacked by the adhesive, which may be a fatal drawback for optically reflective video discs.

The present invention eliminates the above-mentioned drawbacks, and examples thereof will be described below.

The drawing is an illustration of one embodiment of the recording medium according to the present invention.

In the figure, 1 is a substrate made of, for example, transparent acrylic resin and about 1.2 mm thick, and predetermined information is recorded on one surface of this substrate as a change in geometric shape.

2 is a thin reflective film made of metal such as A4 or Or provided on the recording surface of the substrate 1;

3 is a photocurable ink applied by a coating method such as a spray, roll coater, or spinner method, and then cured by irradiating the coating with light, that is, text or pictures indicating the content of recorded information on the video disc. This is a protective film printed by screen or offset printing. The photocurable ink that is the constituent material of the protective film 3 has sufficient adhesion to the reflective film and has excellent weather resistance, so it can fully function as a protective film. There is no need to apply an anoder coat or top coat.

Also, if this protective film is about 5 μm or more thick, it will not be scratched. For example, it has a pencil hardness of about 3H, and if screen printing is used, for example, a film with a thickness of 5 μm or more can be printed in one go. can get.

As described above, in the recording medium according to the present invention, a reflective film is provided on the recording surface of the substrate on which information is recorded as a change in geometrical shape, and a protective film is provided on the reflective film surface. Since it is printed using photo-curable ink, there is no need to go to the trouble of attaching label paper as in the past. Faults such as warping are eliminated, playback is not degraded, and the recorded contents of the recording medium can be displayed extremely easily and at low cost. It has features such as having a sense of luxury compared to other products.

[Brief explanation of the drawing]

The drawing is an explanatory diagram of one embodiment of a recording medium according to the present invention. 1. Substrate, 2. Reflective film, 3. Protective film. Patent Applicant: Victor Japan Co., Ltd. Agent Uko Higashi d

Claims (1)

[Claims] A reflective film is provided on the recording surface of a substrate on which information is recorded as a change in geometric shape, and in a recording medium in which a protective film is provided on the reflective film surface, a photocurable ink is used as the protective film to print the structure. Characteristic recording media.