JPS58112791A - Optical information recording medium - Google Patents

Abstract

PURPOSE:To provide an optical information recording medium having a high reflectivity for wavelengths of laser rays and capable of enhancing the S/N ratio for read signals, by a method wherein a film of coloring matter comprising a triphenylmethane dye and having a bronze luster is supported on a substrate. CONSTITUTION:A solution prepared by dissolving a triphenylmethane dye (for example, CI basic violet 1, CI acid violet 49) into an organic solvent such as methanol is appllied onto the substrate by spraying, roller coating, dipping, spinning or other similar method to produce the film of the coloring matter having a bronze luster, thereby obtaining the objective recording medium.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical information storage member having an organic color chart thin film layer.

In the past, many optical information-enhancing media have been developed for laser writing, the representative ones being recording media with metal, semimetal and non-metal deposited films, and heating of silver dry plates. There are nine life carriers that form a reflex genus.

Currently known laser placement media include holes in which holes are formed by melting a metal thin film and removing it in spots to form a composite glossy film whose reflectivity is reduced in some spots by vapor deposition. There is a thin film of dye or other coating that can be used as a material, and a dielectric whose refractive index is changed at some point to cause scattering of light when scanned by a reading laser. However, the deposition of metals, metalloids and non-metals 1 [
Recording media based on TK are generally manufactured by a vacuum forming method using a batch system rather than a continuous system, so they are expensive and T
o) It is difficult to achieve quality uniformity for mass production of the product as more batches are required. However, since the method of forming a reflective film by heating a silver dry plate is a coating method, it is suitable for mass production, but there is a problem that the BlN ratio is low because of the dispersion of silver particles.

In addition, so-called "
DRAv(air@ct r@ad after wr
The following conditions are required for the lite medium: (1) high rounding reflectance that requires focus and track control of ±1μ during recording, and (2) strong absorption for convenience lasers. Until now, metal has been the material that meets these conditions!
However, the use of metals has inherent problems as described above.

Therefore, the present inventor conducted extensive research into the above problems and developed a recording member that satisfies the conditions (1) and (2) above by using triphenylmethane dye as a material other than metal. This led to the completion of the present invention. That is, the present invention is based on the knowledge that when a solution of the above dye is applied onto a substrate and dried, the dye gives a bronze luster on the substrate and exhibits a large reflectance in the vicinity of absorption of the dye.

According to the present invention, the optical information recording member of the present invention is characterized in that a bronze glossy pigment thin film layer made of triphenylmethane dye is supported on a substrate. Although a glossy dye thin film layer is provided, other layers such as a protective layer may be provided above or below the dye thin film layer depending on the purpose. Here, "bronze luster" refers to the gold-like reflection that a pigment exhibits in a specific light wavelength range, and in reality, a reflectance of 2091 or higher is suitable, and a bronze luster of 30 degrees is preferable. Gloss has a unique coloration that is different from the reflection of metal, but it can have a high reflectance for the wavelength of the laser light used for recording and reproduction, so it is possible to increase the amount of light that continuously outputs information and improves the readout signal. The S/N ratio can be improved.

The substrate materials used in the present invention are known to those skilled in the art and can be either transparent or opaque to the laser light used. However, when writing and recording is performed using a laser beam from the substrate side, it must be transparent to the writing laser beam. On the other hand, when writing is performed from the side opposite to the substrate, that is, from the surface of the marking layer, it is not necessary to be transparent to the writing laser beam. It must be transparent to the laser beam.If reading and reproducing is performed using reflected light, it may be transparent to the sample laser beam or opaque.The substrate material may be glass, quartz, Ceramics, plastics, paper, plate 1+
may be a support for commonly used recording materials such as metal foils. In particular, plastics are preferred in terms of safety, improved recording sensitivity, flatness, light weight, workability, etc.
Typical plastics include vinyl chloride resin, vinyl acetate resin, acrylic resin, methacrylic resin, polyester It mW , nitrocellulose, polyethylene resin, polypropylene resin, polyamide resin, polystyrene resin, polycarbonate resin, and epoxy resin.

The triphenylmethane dye used in the present invention has been used for a long time as an acidic or basic dye, and representative examples include rakite green, magenta, and losol oxygen. I can do it.

Specific examples of these dyes are shown in the color index (C, L).
When expressed as , the following number is 9.

0E Basic Violet 1 (O Engineering 42555), # #
3 (0142555), Ox Basic Blue 1 ((!I42025), #
#5 (C
Engineering 42140), #'7 (O Engineering 42595
), Oe Basic Green 1 (CI
42040), 1 1
4 (OI42000), CI Acid Violet 49 (C Engineering 42640), 0E
Acid Blue 1 (OX 42045)
, 7 (Ox 42080), ' 9 (ox 4209o),
90 (city 42655), 95 (o engineering 42780).

The dye thin film layer with bronze luster in the vAK of the present invention can be formed, for example, by dissolving triphenylmethane dye in an organic solvent and coating the solution on the substrate.

As the organic solvent, for example, water, methanol, methylene dichloride, etc. can be used. Application is spray, low 2
- carried out by conventional coating methods such as coating, dipping and spin-engaging.

The laser beam applied to the optical information recording brass member of the present invention must be selected depending on the absorption wavelength of the dye. Therefore, depending on each dye, 12. H・-Oa.

Selected materials include mulch, H.--N., ruby, dye, and semiconductor laser.

Next, examples will be given to explain the present invention in more detail, but the present invention is not limited thereto.

EXAMPLE Using the conditions shown in the table below, an optical t# reporting material of the present invention was prepared and information was recorded thereon.

In other words, dye α2P must be dissolved in 10tjK of solvent':)
After filtering with a membrane filter of 01 μm, this solution was applied to the substrate by dipping method (dipping speed 13a).
+/sec) K to a predetermined thickness and dried with an infrared lamp, an optical information recording member exhibiting bronze luster was obtained. ■・-N・Laser light (
Beam diameter: 2.4 μm, potential power (8 mV) on the recording surface: 0
When irradiated for 2 μs, the shape of the hole was uniform and clear, and it was 8/N.
I was able to record good (on par with money) information.

The beam diameter is 2.4μ.
m and Ki-men power 8mW. a All brass members had a good 8/N ratio (40 to 5
0 dB) was formed.

Incidentally, among the dyes used in the Examples, the reflectance of the dye of Example 1 as a representative example is shown in FIGS. 1 and 2.

Example number Dye [Orient Ihi Kokuryo Water Blue 9 (ax, a2o9
o))C4MMH
567Cax42040DC'll&@dMonthly') I'kz:W OVtsu) (0142555)J
I42025))661 Water Glass
60 55607 Acetone Glass 24 45627 Methanol Acrylic 20 405
92 Methanol Acrylic 25
38632 Methanol Acrylic
28 50

[Brief explanation of the drawing]

The attached drawings are diagrams showing the reflectance and transmittance of the dye used in Example 1 of the present invention. In the figure, solid lines indicate transmittance and dotted lines indicate reflectance. Demand Defu Kaisha Yosha Rico - ) tlLI 0LILI 10 (1
600'/Nm Procedural Amendment February 18, 1980 Commissioner of the Japan Patent Office Shima 1) Haruki Tono 1, Indication of Case 1989 Patent Application No. 209930 2° 1088 Optical Information Recording Member 3, Amendment Relationship with the case of the person who filed the patent application Address of the patent applicant: 1-3-6 Nakamagome, Ota-ku, Tokyo Name (67
4) Ricoh-4 of Kinsha Co., Ltd., the agent, corrects "At a spot with a membrane" in the first line of page 2 to "At a spot with a membrane." 2) Membrane filter of r[L1μ on page 8, line 9
" is corrected as "α4μ membrane filter". 5) Correct "Recording surface potential nower" in the third row from the bottom of No. 8 to "Recording surface power.""(Metaldifference)" on the last line of page 8 is r (4 oan or more).
I will correct it. 5) Delete lines 1 to 4 on page 9. 6) Delete "and Figure 2" on page 9, lines 6-7. that's all

Claims (1)

[Claims] An optical information recorder material characterized by having a substrate support a pigment thin film layer made of triphenylmethane dye and having a bronze luster.