JPS60113344A - Optical information recording medium - Google Patents

Abstract

PURPOSE:To reduce the eccentricity of a optical information recording medium formed of two transparent substrates, to prevent the occurrence of a flaw and adhesion of dust on one surface of two substrates which is not covered by a recording layer, and further, to prevent the damage of a transparent substrate due to falling down of the optical information recording medium. CONSTITUTION:A cylindrical part 111 and a projected part 112 projected to outside of one side of the cylindrical part are formed, and a cylindrical part 131 and a projected part 132 projected to inside on one side of the cylindrical part 131 are formed. A transparent substrate 1 is fixed to an eccentric holding tool and the first outside cover 13 by bonding agent 12, 14 in the cylindrical part of the eccentric holding tool 11 with a recording layer 3 facing inside. Further, an annular inside spacer 15 and the eccentric holding tool 11 are bonded by bonding agent 16, and the transparent substrate 1, an annular outside spacer 17 and the first outside cover 13 are fixed by bonding agent 18. Further, a recording layer 4 is inserted, and the transparent substrate 2 and eccentric holding tool 11 and an annular inside spacer 15 are bonded respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical information recording medium that performs recording and reading using a laser beam, and particularly relates to a sandwich type or air sandwich type.

Conventionally, a laser beam is focused and irradiated onto the recording layer from the disk-shaped transparent substrate (hereinafter referred to as the "transparent substrate") side made of this type of glass plate, plastic plate, etc. using a lens, and local optical Data are recorded at a diameter of approximately 1 μm due to
Further, an optical information recording medium in which data is read by a method of reading out this optical change has a structure as shown in FIG. That is, the recording layers 3 and 4 are respectively deposited on two transparent substrates 1.2, and the two transparent substrates 1.
．． 2 are placed so that the recording layer 3.4 faces each other, and a ring-shaped inner spacer 5 and a ring-shaped outer spacer 6 are inserted between the two transparent substrates 1.2. There was something stuck to the board 1.2.

However, conventional optical information recording media have the following drawbacks. That is, (1) It is very difficult to precisely align the positions of the holes 9 and 10 of the two transparent substrates 1 and 2, which has the drawback of increasing eccentricity, and (2) Optical information recording. When the media is placed on a table, etc., the surface of the transparent substrate comes into direct contact with the surface of the table, etc., which has the disadvantage of causing minute scratches that reduce recording and reading functions, as well as smudges and dirt. 3) Furthermore, in conventional optical information recording media, the outer and inner edges of the transparent substrates 1 and 2 are easily damaged due to impact such as dropping, and the inside of the optical information recording medium is easily damaged through the damaged parts. There was a drawback that outside air entered and deteriorated the recording layer.

An object of the present invention is to provide an optical information recording medium having a structure designed to eliminate the above-mentioned drawbacks. That is, the first purpose is to reduce the amount of eccentricity of an optical information recording medium formed by two transparent substrates,
Next, prevent the occurrence of scratches on the surface of the two transparent substrates on which the recording layer is not attached, and prevent the adhesion of dust and dirt; and 7. The purpose of this invention is to prevent damage to a transparent substrate due to a fall of an S optical information recording medium, and also to improve workability in forming an optical information recording medium.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

(Example 1) This will be explained based on FIG. 2.

(1) First, precision polished outer diameter 305mm1llφ
, hole diameter 35 Inlφ, thickness 1, 2 mm, eccentricity 1 io
A recording layer 3.4 made of Te or the like is deposited at a thickness of about 15 OA on each surface of a transparent substrate 1.2 of soda lime glass having a thickness of about 15 OA (FIG. 4(a)).

(2) Next, an eccentric holder (for example, polycarbonate resin) 11 having an L-shaped cross section, for example, has a cylindrical portion 111 and a protruding portion 112 that protrudes outward on one of the cylindrical portions 111. Apply adhesive 1 to the recess of the protrusion 112 of
2 (b)), a cylindrical portion 131 and a protruding portion 132 that protrudes inward from one of the cylindrical portions 131.
A protruding portion 13 of a first outer cover (for example, polycarbonate resin) 13 having an L-shaped cross section, for example, forming a
The adhesive 14 was not filled in the recessed part 2 ((C) of the same figure). Here, the eccentric holding hl is 1 mm, and the height h2 of the eccentric holding tool 11 is 4.4III1+. Further, the protrusion of the first outer cover 13 is 305 mm+ψ, and the cylindrical portion 131
The outer diameter D3 of the protrusion 13 is 309IllIllψ.
The height Hl of the second outer cover 13 is 1 mm and the first outer cover 13
The height H2 is 4.4 mm.

(3) Next, the recording layer 3 is attached to the cylindrical portion of the eccentric holder 110.
Insert the transparent substrate 1 into the hole 9 of the transparent substrate 1 with
, 132, the transparent substrate 1 is attached to the eccentric holder and the first outer cover 13 by the adhesive 12.
to fix.

(4) Next, a ring-shaped inner spacer with a convex cross section (eg, polycarbonate resin, thickness 0.5 mm).

) Adhering adhesive 16 to the lower recess of 15, inserting the ring-shaped inner spacer 15 from the cylindrical part 111 of the eccentric holder 11, and then inserting the ring-shaped inner spacer 15 into the surface of the transparent substrate 1 on which the recording layer 3 is attached. sticks to. At this time, the positioning can be easily determined by bringing the convex portion of the ring-shaped inner spacer 15 into contact with the outer peripheral surface of the cylindrical portion 111 of the eccentric holder 11.

Further, the ring-shaped inner spacer 15 and the eccentric holder 11 are also fixed together by the adhesive 16. Similarly, an adhesive 18 is applied to the lower recessed part of the ring-shaped outer spacer 17 (for example, polycarbonate resin, thickness 0.5 mm) having a convex cross section, and the convex part of the ring-shaped outer spacer 17 is By contacting the inner circumferential surface of the cylindrical portion 131 of the first outer cover 13, positioning can be easily performed. Fix the cover 13.

(5) Next, the upper recesses of the ring-shaped inner spacer 15 and the ring-shaped outer spacer 17 are filled with adhesive 19 and 20, and the recording layer 4 of the transparent substrate 2 is
Insert the hole 10 of the transparent substrate 2 into the cylindrical portion 111 of the eccentric holder 11 so as to face the recording layer 3 of the transparent substrate 1, insert the transparent substrate 2, and apply the adhesive 19.
．． 20 fix the transparent substrate 2, the first outer cover 13, and the ring-shaped outer spacer 17, or the transparent substrate 2, the eccentric holder 11, and the ring-shaped inner spacer 15, respectively.

(6) Finally, adhesive 22 is applied to the recess of a ring-shaped inner cover (for example, polycarbonate resin) 21 having an L-shaped cross section, so that it protrudes from the transparent substrate 2 of the eccentric holder 11. The transparent substrate 2, the eccentric holder 11, and the ring-shaped inner cover 21 are fixed using the adhesive 22. Similarly, the second outer cover is ring-shaped and has an L-shaped cross section (for example, polycarbonate 1 to resin).

) 23 and attach the adhesive 24 to the recess of the transparent substrate 2.
, fixing the first outer cover 13 and the second outer cover 23.

Next, Table 1 shows a comparison between this embodiment and the conventional structure (FIG. 1). Here, the shape and material of the transparent substrate, the material of the recording layer, the film thickness, and the film forming conditions are the same.

Table 1 * Number of times the transparent substrate was dropped from a height of 111Il onto concrete until it was damaged.

*2 Number of scratches, dents, and stains when an optical information recording medium is placed horizontally on a desk and moved a distance of less than 1 meter.

As described above, this example is superior to the conventional structure in terms of eccentricity, damage caused by dropping, and fine scratches on the surface of the transparent substrate. Furthermore, in this embodiment, the cylindrical portion of the eccentric holder and the first outer cover are used to determine the positions of the transparent substrate, the ring-shaped inner spacer, and the ring-shaped outer spacer, so the workability is improved by several steps. .

(Example 2) This will be explained based on FIG. 3. In this example,
The purpose is to reduce the amount of eccentricity of an optical information recording medium formed by adhesively sealing a transparent substrate 1.2.

(1) First, use the same eccentric holder as in Example 1 (however,
The protrusion 112 is not provided with a recess. The inner diameter d1 and the outer diameter d2 of the cylindrical portion 111, and the outer diameter d3 and height hl of the protruding portion 112 are the same as in Example 1, and the height h2 of the eccentric holder is 3.9n+n+. ) Cylindrical part 11 of enemy #public 11
1, the transparent substrate (same as in Example 1) is inserted along the same way as in Example 1, and is fixed with the adhesive attached to the upper surface of the protrusion 112.

(2) Next, a ring-shaped inner spacer 15 with a rectangular cross section
Adhering adhesive to the lower surface of the ring-shaped outer spacer 17 having the same shape as above, the ring-shaped inner spacer 15 is inserted along the cylindrical portion 111 of the eccentric holder 11, and the ring-shaped outer spacer 17 is It is installed near the outer periphery of the transparent substrate 1 and is fixed to the surface of the transparent substrate 1 on which the recording layer 3 is attached.

(3) Next, adhesive is applied to the upper surfaces of the ring-shaped inner spacer 15 and the ring-shaped outer spacer 17, and the transparent substrate (same as in Example 1) 2 is attached along the cylindrical portion 111 in the same manner as in Example 1. and secure it with the adhesive. At this time, the positions of the upper surface of the transparent substrate 2 and the upper surface of the eccentric holder 11 substantially match.

(4) Finally, a ring-shaped inner cover with a rectangular cross section (
Thickness: 0.5++uIl, inner diameter is the same as the inner diameter of the cylindrical part of the eccentric holder. ) 21 with adhesive attached to the bottom surface of the transparent substrate 2.
It is fixed to a part of the upper surface and the upper surface of the eccentric holder 11.

As mentioned above, in Examples 1 and 2, the inner diameter of the cylindrical part of the eccentric holder and the inner diameter of the inner cover were the same;
The material is not limited to this, and may be anything that simply covers a part of the upper surface of the transparent substrate 2, as shown in FIG. 4, for example. Next, in Example 1, the first outer cover and the second outer cover are
The outer cover may have a shape similar to that of the eccentric holder and the inner cover of Embodiment 2, for example, as shown in FIG. It may have any shape as long as it covers a part of the lower surface of the transparent substrate and the other transparent substrate. The dimensions of the eccentric holder and the first outer cover are not limited to the dimensions of Embodiment 1 or 2, and may be appropriately determined depending on the size and weight of the transparent substrate. Next, the cross-sectional shapes of the ring-shaped inner spacer and the ring-shaped outer spacer are not limited to the shapes of Example 1.2, but may be any shape that has the effect of a spacer. Next, in Example 1, the distance from the bottom surface of the lower transparent substrate to the bottom surface of the eccentric holder and the distance from the bottom surface of the first outer cover are substantially the same, and the distance from the bottom surface of the upper transparent substrate is substantially the same. The distance from the top surface to the top surface of the inner cover and the distance from the top surface of the second outer cover are substantially the same, but if either one is substantially the same distance, the optical information recording medium of the present invention can be used. It has a similar effect when installed on a turntable or the like. Next, the transparent substrate is not limited to soda lime glass, but may be other glass, or may be made of resin such as PMMA resin.

Next, the material of the eccentric holder, the inner cover, and the first and second outer covers is not limited to polycarbonate resin, but may be resin such as hard vinyl chloride resin or metal such as AR. Next, when the present invention is installed on a turntable or the like, for example, the bottom surface of the eccentric holder or the bottom surface of the first outer cover is treated with a knurling, mesh, or grain pattern to prevent slipping. It's okay. Furthermore, the same effect can be obtained not only in an optical information recording medium in which two transparent substrates each have a recording layer attached thereto, but also in an optical information recording medium in which only one transparent substrate has a recording layer attached thereto.

As described above, according to the present invention, the amount of eccentricity can be reduced,
Furthermore, it is possible to prevent scratches on the surface of the transparent substrate and damage due to dropping, and it is possible to improve the workability of forming an optical information recording medium.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing a conventional optical information recording medium, and FIG. 2 is a cross-sectional view showing an embodiment of the present invention. FIG. The figure (b) is a sectional view of the eccentric holder, the figure (-C) is a sectional view of the first outer cover, and the figure (d) is a sectional view showing the structure of an embodiment of the present invention, Figure (e) is a partially enlarged sectional view of Figure (d). FIG. 3 is a sectional view showing another embodiment of the present invention,
FIG. 3(a) is a sectional view of an eccentric holder, and FIG. 1(b) is a sectional view showing the structure of another embodiment of the present invention. FIG. 4 is a partially enlarged sectional view showing another embodiment of the present invention. 1.2...Transparent substrate, 3.4...Recording layer, 11...
- Eccentric holder, 13...first outer cover, 15...
- Ring-shaped inner spacer, 11... Ring-shaped outer spacer, 21... Inner cover, 23... Second outer cover, 111... Cylindrical part of eccentric holder, 112...
Projection part of eccentric holder, 131...Cylindrical part of first outer cover, 132...Protrusion part of first outer cover Fig. 2, Fig. 4 Procedure amendment (voluntary) 1. Display of the case 1982 Patent Application No. 221215 2
, Title of the invention Optical information recording medium 3, Relationship to the case of the person making the amendment Patent applicant address 1-13-12 Nishi-Shinjuku, Shinjuku-ku, Tokyo 160
03 (348) 1221 Hoya Glass Name Hoya Glass Co., Ltd. (1) “Claims” column of the specification (2) “Detailed description of the invention” column of the specification (3) Drawings "Figure 3 (b)" and "Figure 4" 5. Contents of amendment (1) The scope of the claims is amended and covered as shown in the attached sheet. (2) On page 5, line 8 of the specification box, the phrase "(same figure (b)), cylindrical part" is corrected to "(same figure (b)), on the other hand, cylindrical part." (3) In the 6th twelfth line of the specification, there is a phrase "1 in the cylindrical portion of the eccentric holding shell 11" [the eccentric holding tool 11 is provided near the center of the first outer cover 13, and the eccentric holding tool The cylindrical part of 11 is corrected by 1. (4) In the 6th true line 12th line of the specification, "Cylinder part 111, edge" is corrected by 1 degree along the cylindrical part 111. (5) In the 8th line of the 8th page of the specification, [Cover 23 The cover 23 is fixed to form the optical information recording medium of this embodiment (FIG. 2(d)). ] and correct it. (6) On page 10 of the statement box, lines 15 to 16, it says "Attach adhesive to the bottom surface of spacer 17,!". 1. Attach adhesives 7 and 8 to the bottom surface of each spacer 17, respectively. "And then," he corrected. 7) In the second line of page 11 of the statement box, the phrase "Adhesive is applied to the upper surface of the spacer 17," has been replaced with "Adhesive 7.8 is applied to the upper surface of each of the spacers 1 and 17." and correct it. (8) On page 11, lines 16 and 17 of the specification store, [It may be anything that covers part of the top surface. '' should be corrected to ``It may cover a part of the upper surface and be in contact with the eccentric holder.'' (9) From page 11, line 20 of the specification tube to page 12, line 3, “
For example, as shown in FIG. 4, the shape may be any shape that covers the entire outer periphery of two transparent substrates, a portion of the upper surface of one transparent substrate, and a portion of the lower surface of the other transparent substrate. "For example, as shown in FIG. 4, the first outer cover 13 consists of two transparent substrates 1
, 2 and a part of the lower surface of one transparent substrate 1. 1, which is in contact with the outer cover 13 of 1. -I and correction J. (10) Figures 3(b) and 4 are corrected as attached sheets have not been distributed. Attachment 2 above. Particular i' [Claim (1) A recording layer for recording information using a laser beam is provided on at least one of the two transparent substrates each having a cylindrical void in the center thereof. (c) The two transparent substrates are arranged so that the recording layer is present between the two transparent substrates, and the cylindrical voids of the two transparent substrates are arranged to face each other. The information recording medium has a cylindrical part in the opposed columnar gap part,
The cylindrical part of the eccentric holder is inserted into one open end of the cylindrical part, and the cylindrical part is formed with a protruding part that is bonded to one of the transparent substrates. has a height such that the other open end on which the protrusion is not formed is on an extension of the outer surface of the transparent substrate that is not bonded to the protrusion or on the outside of the extension, and According to JP-A-60-113344 (7), an inner cover in the form of a ring or the like is provided, which covers at least a part of the outer surface of the transparent substrate that is not bonded to the protrusion and is in contact with the eccentric holder. An optical information recording medium with a characteristic. (2) having a cylindrical portion on the outer periphery of the optical information recording medium;
a first outer cover formed with a protrusion that extends inward at one open end of the cylindrical portion and is bonded to one of the transparent substrates; and at least the protrusion of the first outer cover is bonded. Claim (1) characterized in that a ring-shaped second outer cover is provided that covers a part of the outer surface of the other transparent substrate that is not covered and is in contact with the first outer cover. Optical information storage medium described in Section A. Figure 4

Claims (2)

[Claims] (1) A recording layer for recording information using a laser beam is provided on at least one of the two transparent substrates each having a cylindrical void in the center thereof, and the two transparent substrates are , the optical information recording medium is arranged such that the recording layer is present between the two transparent substrates, and further arranged so that the cylindrical gap portions of the two transparent substrates face each other, the opposing cylindrical Insert the cylindrical part of an eccentric holder, which has a cylindrical part, and has a protruding part formed at one open end of the cylindrical part to be bonded to one of the transparent substrates toward the outside. and the other open end of the cylindrical part on which the protrusion is not formed is on an extension of the outer surface of the transparent substrate that is not bonded to the protrusion, or on the outside of the extension. It has a height such that
An optical information recording medium further comprising a ring-shaped inner cover that covers at least a part of the outer surface of the transparent substrate that is not bonded to the protrusion. (2) having a cylindrical portion on the outer periphery of the optical information recording medium;
a first outer cover formed with a protrusion that extends inward at one open end of the cylindrical portion and is adhered to one of the transparent substrates; and at least the protrusion of the first outer cover is adhered. The optical information recording medium according to claim 1, further comprising a ring-shaped second outer cover that covers a part of the outer surface of the other transparent substrate.