JPH03125349A - Optical information recording carrier - Google Patents

Abstract

PURPOSE:To prevent the deviation between a pair of circular substrates each having a central hole by disposing the substrates to face each other with signal recording layers positioned on the inner side, adhering the inner and outer peripheries via annular spacers and providing a centering means. CONSTITUTION:The circular substrates 11, 12 each having the central hole are adhered via the annular spacers 15, 16 so as to face each other with signal layers 13, 14. The substrates 11, 12 consist of a transparent synthetic resin and a hub 18 formed by embedding a magnetic part 18b in a resin part 18a is adhered to the central part on the outer side. A hub 19 is similarly adhered and a spindle is inserted into the central hole. The notch 16a of the spacer 16 is a through-hole to an internal space 17. An arc-shaped spring 21 is inserted into the central holes of the substrates and the spacer 16 to center the substrates 11, 12. The notched part of the spring 21 corresponds to the through-hole of the notch 16a of the spacer and the curved part 21b of the spring engages with notches 11c, 12c, 16c of the spacers. The projection 19d of the magnetic part of the hub 19 engages with the notched part 21a of the spring 21. The two substrates 11, 12 are centered to each other by this constitution and do not deviate from each other even in the adhesive strength weakens.

Description

TECHNICAL FIELD The present invention relates to an optical information recording carrier, and more particularly to an optical information recording carrier comprising a pair of circular substrates bonded to each other so that the signal recording layer is on the inside.

BACKGROUND ART Optical information recording carriers, such as DRAW (Dlreet)
For Read After Wrlte) discs,
Since information is recorded as many minute bits, it is important to protect the layer in which the pits are formed, that is, the signal recording layer. For this reason, a type has been developed in which a pair of circular substrates, at least one of which has a signal recording layer, are bonded to face each other with the signal recording layer on the inside.

FIG. 5 shows an example of a conventional optical information recording carrier. Fifth
As shown in the figure, two transparent circular substrates 1 and 2 made of resin or the like have signal recording layers 3 and 4, respectively, and the two substrates face each other so that the signal recording layers are on the inside. They are arranged as follows and are bonded to each other with an adhesive via an annular inner spacer 5 and an annular outer spacer 6, respectively.

In the optical information recording carrier having such a structure, when an adhesive material that does not completely solidify is used as the adhesive for bonding the circular substrates 1 and 2, the optical information recording carrier may be exposed to relatively high temperatures. The viscosity of the adhesive decreases and the adhesive strength weakens when used or stored in
and 2 were sometimes displaced from each other in the radial direction.

Summary of the Invention [Object of the Invention] The present invention has been made in view of the above points, and its object is to provide an optical information recording carrier that prevents misalignment between circular substrates.

[Structure of the Invention] In the optical information recording carrier according to the present invention, a pair of circular substrates each having a center hole and at least one having a signal recording layer are placed facing each other with the signal recording layer on the inside, and the circular It is characterized in that the inner and outer peripheral portions of the substrate are bonded together via an annular spacer, and that it has a centering means for centering the convex portions of the circular substrate with respect to each other.

[Operation of the Invention] In the optical information recording carrier having such a structure, the dual-use substrates are centered with respect to each other by the centering means.

Embodiments Hereinafter, optical information recording carriers as embodiments of the present invention will be explained with reference to the accompanying drawings.

1 to 3 show an optical information recording carrier as a first embodiment of the present invention.

As shown in FIGS. 1 and 2, the optical information recording carrier includes two transparent circular substrates 11 and 12 of the same shape and size made of synthetic resin or the like, each having a center hole 11a and 12a. have. Signal recording layers 13 and 14 are provided on one side of the dual-use substrates 11 and 12, respectively, and the dual-use substrates are opposed to each other so that the respective signal recording layers are on the inside. A pair of large and small annular spacers 15 and 16 are interposed between the circular substrates 11 and 12, corresponding to the inner and outer peripheral parts of the circular substrate, that is, the parts where the signal recording layers 13 and 14 are not present. The dual-use substrates are bonded to each other by adhesive via these spacers. Therefore, an internal space 17 surrounded by circular substrates 11 and 12 and annular spacers 15 and 16 is formed. Each signal recording layer 13 and 14 is located within this internal space and is protected from direct contact with the outside.

Disc-shaped hubs 18 and 19 are attached to the center of the outer surfaces of the dual-use substrates 11 and 12, respectively, with adhesive or the like. The hub 18 consists of a main body portion 18a made of resin, and a magnetic portion 18b made of a steel plate or the like and embedded in the main body portion 18a.

Further, an insertion hole 18c is formed in the center of the magnetic part 18b, into which a spindle (not shown) for rotationally driving the optical information recording carrier is inserted. Note that, like the hub 18 described above, the other hub 19 also consists of a main body portion 19a and a magnetic portion 19b, and has an insertion hole 19c.

As is particularly clear from FIG.
The small-diameter annular spacer 16 interposed between the inner circumferential portions is not completely annular, but is formed in a C-shape with a notch 16a. This notch 16a serves as a ventilation hole, and the atmosphere can freely enter and exit the internal space 17 through the ventilation hole.

Therefore, even if the atmospheric pressure changes, the pressure inside the internal space 17 and the atmospheric pressure always remain in balance, and even if the atmospheric pressure changes, the circular substrates 11 and 12 will not warp.

An arcuate spring 2 as a centering means is installed in the center holes 11a and 12a of each circular substrate 11 and 12 and in the annular spacer 16.
1 is inserted. The arcuate spring 21 is formed by bending a strip-shaped spring steel plate made of stainless steel or the like into a circular shape in its thickness direction, and presses the inner wall surfaces of the center holes 11a and 12a of each circular substrate 11 and 12 with its outer peripheral portion. By providing the arcuate spring 21, the pair of circular substrates 11 and 12 are centered with respect to each other.

By the way, when an adhesive that does not completely solidify is used as the adhesive for bonding the dual-use substrates 11 and 12, the optical information recording carrier may not be used or stored at relatively high temperatures. This is thought to cause the viscosity of the adhesive to decrease, resulting in a decrease in adhesive strength. However, as described above, since the dual-use substrates 11 and 12 are centered with respect to each other by the centering means, that is, the arcuate spring 21, there is no fear that the circular substrates will be misaligned with each other.

As shown in the figure, the arcuate spring 21 is disposed such that its cutout portion corresponds to the cutout portion 16g, that is, the communication hole, of the annular spacer 16. Due to this configuration, the communication hole is not closed by the arcuate spring 21, and a state of communication between the internal space 17 and the outside can be obtained.

As shown in FIGS. 1 and 3, bent portions 21b bent outward are provided at both ends of the arcuate spring 21. As shown in FIGS. On the other hand, the dual-use substrates 11 and 12 and the annular spacer 16 have notches 11c, 12c and 16.
c are formed respectively, and the bent portion 21b of the arcuate spring 21
is engaged with each of these notches. These bent portions 21b
The notches 11c, 12c, and 16c constitute a first locking means for locking the arcuate spring 21 to the dual-use substrates 11 and 12 and the annular spacer 16. By providing such a locking means, the arcuate spring 21 is prevented from slipping, and there is no fear that the arcuate spring 21 will inhibit the communication state of the communication hole, that is, the notch 16a of the annular spacer 16.

As shown in FIGS. 1 and 2, a projection 19d is formed on the magnetic portion 19b of the hub 19 fixed to one of the circular substrates 12, and the projection 19d engages with the cutout portion 21a of the arcuate spring 21. are doing. This configuration constitutes a second locking means for locking the arcuate spring 21 to the dual-use substrates 11 and 12 and the annular spacer 16.

The optical information recording carrier of this embodiment is provided with the first and second locking means and two locking means for fixing the arcuate spring 21, and at least one of these is provided. It is sufficient if it is provided. However, if the above-mentioned communication hole is not provided in the inner annular spacer 16 but is formed in the outer annular spacer 15 as in the embodiment shown in FIG. 1, it is necessary to provide such a locking means. There isn't. Further, because the arcuate spring 21 engages with the annular spacer 16 and the dual-use substrate 11.12 with a relatively large frictional force due to its elasticity, even when the inner annular spacer 16 is provided with the communication hole. Each of the above-mentioned locking means is not necessarily required. Furthermore, the arcuate spring 21 may be fixed using an adhesive without providing these locking means.

In the above embodiment, the arcuate spring 21 is obtained by bending a strip-shaped spring steel plate into a circular shape in the thickness direction, but the configuration is not limited to this. It may be bent into a polygonal shape such as a triangular shape in the thickness direction. Alternatively, the band-shaped spring steel plate may be deformed into an arcuate shape by elastic deformation and used without being bent. However, even in this case, it is preferable to provide the bent portion 21b at the end of the spring steel plate as in the above embodiment.

Further, in the above embodiment ['--, the arcuate spring 21 is made of stainless steel or the like, but it may be made of resin.

FIG. 4 shows an optical information recording carrier as a second embodiment of the present invention. The optical information recording carrier shown in FIG. 4 has the same structure as the optical information recording carrier according to the first embodiment shown in FIGS. 1 to 3 except for the parts explained below, and the details are as follows. I will not state it. Also, in the following explanation, the first
The same reference numerals are used for the same or corresponding parts as those of the optical information recording carrier shown in the figures through FIG.

As shown in FIG. 4, in this embodiment, for example, three bottles 25 are provided so as to pass through the pair of circular substrates 11 and 12 and the annular spacer 16 on the inner circumference in parallel with each other. Note that the bins 25 are arranged at equal intervals in the circumferential direction of the optical information recording carrier. These bins 25 constitute centering means for centering the two date-shaped substrates 11 and 12 with respect to each other. By providing such centering means, the pair of circular substrates 11 and 12 are firmly fixed to each other.

In the above embodiment, the bottle 25 is provided so as to pass through the inner annular spacer 16, but it may be provided so as to pass through the outer annular spacer 15.

Effects of the Invention As described in detail above, in the optical information recording carrier according to the present invention, each of the pair of circular substrates whose inner and outer circumferential portions are adhered via an annular spacer is centered with respect to each other by the centering means. I am forced to come out.

Therefore, even if the adhesive strength of the adhesive weakens, displacement of the circular substrates from each other is prevented.

[Brief explanation of drawings]

1 and 2 are a diffused exploded perspective view and a vertical cross-sectional view, each including a partial surface, of an optical information recording carrier as a first embodiment of the present invention, and FIG. 3 is a diagram showing ■-■ related to FIG. 4 is a longitudinal sectional view of an optical information recording carrier according to a second embodiment of the present invention, and FIG. 5 is a perspective view including a cross section of a conventional optical information recording carrier. Explanation of symbols of main parts 11.12-... Circular substrate 13.14... Signal recording layer 15.16... Annular spacer 21... Arc-shaped spring 25・・・・・・BinjjI>l Figure

Claims (6)

[Claims] (1) A pair of circular substrates, each having a center hole and at least one having a signal recording layer, are placed facing each other with the signal recording layer facing inside, and the inner and outer circumferences of the circular substrates are connected to each other via an annular spacer. What is claimed is: 1. An optical information recording carrier comprising a plurality of circular substrates bonded together, the optical information recording carrier comprising centering means for mutually centering each of the circular substrates. (2) The optical information recording carrier according to claim 1, wherein the centering means comprises an arcuate spring that is inserted through the center hole and presses an inner wall surface of the center hole at an outer peripheral portion. (3) having an internal space surrounded by the circular substrate and the annular spacer, a communication hole that communicates the internal space with the outside, formed in the annular spacer disposed on the inner peripheral portion; 3. The optical information recording carrier according to claim 1, wherein the spring is disposed such that a cutout portion thereof corresponds to the communication hole. (4) The optical information recording carrier according to any one of claims 1 to 3, further comprising a locking means for locking the arcuate spring to the circular substrate and the annular spacer. (5) The locking means includes a bent portion formed by bending both ends of the arcuate spring outward, and a notch formed in the circular substrate and the annular spacer to engage with the bent portion. The optical information recording carrier according to any one of claims 1 to 4, characterized in that: (6) The optical information recording carrier according to claim 1, wherein the centering means comprises at least a pair of pins provided so as to penetrate each of the circular substrates and the annular spacer.