JPS60103535A - Optical recording medium - Google Patents

Abstract

PURPOSE:To improve the performance of assembling work by chamfering ridge lines of ends of a base and/or a spacer so as to prevent an excessive adhesives from being adhered to a part other than a face to be bonded thereby omitting the removing process of squeeze-out adhesives. CONSTITUTION:Recording layers 3', 4' are formed on doughnut form acrylic resin base plates 1, 2 to the ends of which chamfering is applied and the layers 3', 4' are bonded by adhesives 5', 5'' while clipping spacers 6', 7' subject to chamfering so that the layers 3', 4' are opposed thereby constituting an optical recording medium of the air sandwich structure. The excessive adhesives is absorbed by the chamfered part so as to prevent the adhesives from being protruded except at the face to be bonded. It is prevented that the adhesives from the base end face is protruded, the protrusion into the hollow part of the air sandwich structure is prevented also, the distance between the face to be bonded and the recording layer is made to approach and the recording part is widened.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical recording medium on which recording and reproduction can be performed using a light beam.

Conventionally, two recording media in which an optical memory material utilizing magneto-optic effect, photochromism, phase transition from amorphous to crystalline, etc. is deposited on a substrate such as glass, acrylic resin, or polycarbonate resin are placed facing each other. Optical recording media have been proposed, such as a laminated structure in which the recording medium is bonded in a similar manner, and an air-length Doite structure in which a spacer is sandwiched and bonded to the recording medium.

When assembling these recording media, an adhesive is used to fix the media, but when conventionally shaped substrates and spacers are used, there is a problem of too little or too much adhesive being applied. In other words, if the amount of adhesive applied was less than the required amount, uneven contact would occur, resulting in products with insufficient adhesive strength or poor appearance, which would reduce production yields. . In addition, if too much adhesive is applied, the adhesive will overflow to areas other than the surface to be adhered, so it is necessary to remove the overflowing adhesive after bonding and assembly, or to make the base body in advance a size larger than the required size. After assembly, it was necessary to remove the protruding adhesive T1 after assembling the recording medium, such as cutting the outer and inner peripheral parts together with the protruding adhesive to a specified size and removing it.

The purpose of the present invention was to improve the above-mentioned problems, and the purpose of the present invention is to eliminate the need for removing the protruding adhesive after assembly and to ensure that the required amount of adhesive is sufficiently applied to the surface to be bonded. An object of the present invention is to provide an optical recording medium having a laminated structure or an air sandwich structure.

The above-mentioned object of the present invention is to provide an optical system having a recording layer bonding structure in which two recording media each consisting of an eleven substrate and a recording layer formed on the substrate are arranged concentrically so that the recording layers face each other. (2) an optical recording medium characterized in that the ridgeline of at least one of the two substrates on the side to be adhered is chamfered, or (2) the substrate and the substrate; In an optical recording medium having an air sandwich structure, in which two recording media each having one recording layer formed on a substrate are bonded together with a spacer in between so that the recording layers face each other, at least ( 1) Edge line of the end of the two substrates on the side to be adhered, (11)
The ridgeline at the end of the two adhesive surfaces of the spacer, or the curve) The ridgeline at the end of the adhesive surface of one of the two substrates, and the adhesive surface of the spacer facing the other substrate. This is achieved by providing an optical recording medium characterized in that the edges of the edges are chamfered.

In the present invention, by chamfering the edges of the base and/or the spacer as described above, excess adhesive is prevented from adhering to surfaces other than the surface to be adhered, and the step of removing excess adhesive can be omitted. Therefore, assembly work efficiency can be improved.

In addition, in the recording medium of the present invention, since the amount of excess adhesive that can be absorbed by the chamfered portion is not a problem, the adhesive 6 can be applied to the strips slightly more than the required 1'', and therefore the adhesive Z1 unevenness can be reduced. The possibility of this occurring is extremely small.

The present invention will be specifically explained below with reference to Examples.

Embodiment 1 FIG. 1 is a side sectional view of an optical recording medium having a doughnut-shaped laminated structure, which is one embodiment of the present invention.

FIG. 7 is an A-law sectional view of a conventional bonded structure.

1 and 2 are donut-shaped substrates made of acrylic resin. As is clear from the figure, the surface on which the recording layer 6゜4 is formed is 1 or 2, regardless of whether it is the outer circumference or the inner circumference.
) i! li part C 21n' is an alms. These two recording media are pasted together with an adhesive 5 so that the recording layers face each other to form an optical recording medium with a pasted structure. During this adhesive fixation, excess adhesive is pushed toward the edge of the substrate, but because it is absorbed by the chamfered portion, the adhesive is not applied to surfaces other than the bonded surface compared to conventional optical recording media with a bonded structure (Figure 7). It never sticks out.

Embodiment 2 FIG. 2 is a side sectional view of a doughnut-shaped air sandwich structure according to a second embodiment of the present invention.

FIG. 8 is a side sectional view of a conventional air-length German tie structure.

Acrylic resin substrate 1 with chamfering as in Example-1,
Recording layers 3' and 4' are formed on 2. These two recording media are bonded and fixed with adhesives 5' and 5'' with spacers 6 and 7 in between so that the recording layers 3' and 4' face each other, thereby forming an optical recording medium with an air sandwich structure. ing.

As in Example 1, the excess adhesive is absorbed by the chamfered parts of the substrates 1 and 2, so the appearance of the adhesive and the external contact are reduced compared to the conventional air-sun structure optical recording medium (Fig. 8). No adhesion of mixture. .

Example-3 Space 16' with chamfered edges on both ends of the contacting surfaces.

FIG. 6 shows a side cross-sectional view of an optical recording medium having an Air-Nandertsch structure constructed in the same manner as in Example 2 except that 7' was used. In this case, it is possible to prevent excess contact and adhesion of agent 1 to the recording layer portion because it prevents the adhesive and agent 1 from protruding from the end surface of the substrate and also prevents it from protruding into the hollow part of the air sandwich structure. 111-, which brings the surface to be adhered closer to the recording layer, leads to an increase in the recording area.As can be seen by comparing the recording areas in Figures 2 and 6, the recording area in Figure 6 is wider. I can do it.

Example 4 Another example of the present invention is shown below. Figure 4 is Example-1
FIG. 5 is a side sectional view of the spacer of Example 3 in which only the substrate 1 is chamfered. Furthermore, 1'
, 2' is a solid acrylic 1b1 resin substrate. Figure 6 shows acrylic-J--6' of Example-3;
FIG. 7 is a side sectional view of an optical recording medium using spacers 6", 7" which are chamfered only on the surface facing the substrate 2' instead of the spacers 7'. It is clear from the structure that the recording media shown in FIGS. 4, 5, and 6 can also prevent the adhesive from adhering to surfaces other than the surface to be adhered.

As explained above in Examples 1, 2, and 3.4, the optical recording medium according to the present invention has two
In the case of an air sandwich structure, at least (1) two substrates, (2)
By chamfering the edges of both adhesive surfaces of the spacer, or (3) the edges of one substrate and one adhesive surface of the spacer (opposed to the other substrate), there is no excess adhesive used during assembly. This prevents the adhesive from adhering to surfaces other than those to be adhered. Therefore, steps after assembly can be omitted, and workability can be improved.

In the above embodiments, a donut-shaped optical recording medium is described as an example, but the shape of the optical recording medium of the present invention is of course not limited to the donut shape, and any other shape may be used. It also includes optical recording media with a laminated structure or an air sandwich structure.

[Brief explanation of the drawing]

1 to '(S) 6 are side sectional views schematically showing the structure of the optical recording medium of the present invention, and FIGS. 7 and 8 are side sectional views schematically showing the structure of conventional optical recording media. 1.2... Substrate (with chamfer) 1', 2'... (without chamfer) 3, 3', 4, 4'... Optical recording layer 5 .5', 5"...Adhesive layer 6.7...Spacer (no chamfer) 6', 7'
...Spaner (〃 Double-sided) 6", 7"...
... (〃 Single-sided) Patent applicant: Canon Co., Ltd.

Claims (1)

[Claims] (1) A recording layer bonding structure in which two recording media each consisting of a substrate and a recording layer formed on the substrate are brought into contact with each other so that the recording layers face each other. optical recording 41
1. An optical recording medium characterized in that a ridgeline of at least one of the two substrates at an end on the surface to be contacted with Zi' is chamfered. (2) J, 5 bodies and the substrate -] Two recording media consisting of the recording layers formed on the second body are brought into contact with a spacer in between so that the recording layers face each other! (ffi) At least (1) two sheets of 21
1) The ridge line at the end of the two tangential surfaces of Svener, or tlii) of the two]□(one of the bodies,!
1 (An optical recording medium characterized in that the ridgeline at the end of the adhesive surface of the body and the ridgeline of the end of the adhesive surface of the spacer facing the other substrate are chamfered.