MX2008005580A - Optical disc and method for fabricating the same - Google Patents

Abstract

An optical disc capable of suppressing vibration during read/write process includes an annular substrate, a coated layer, and a damping layer. The annular substrate includes a supporting portion and a recording portion, and a recording surface corresponding to the recording portion. The coated layer is formed on the recording surface. The damping layer is formed on the coated layer side of the annular substrate for increasing the response time to vibration of the optical disc. A method for fabricating the aforementioned optical disc is also disclosed.

Description

OPTICAL DISC AND METHOD TO MANUFACTURE THE SAME TECHNICAL FIELD The invention relates to an optical disk and to a method for manufacturing the same and, more particularly, to an optical disk capable of suppressing vibration while performing read / write and a method for manufacturing such an optical disk.

BACKGROUND OF THE INVENTION An optical disk can store data in different formats and is the most convenient storage medium among optical storage media of the new generation. In addition, an optical disk can be applied in many fields, including library files, data backup, electronic publishing, image data storage and handling of personal medical records. Shown in Figure IA is the top view of a conventional optical disk (1); the conventional optical disc (1) is annular and can be divided into an internal support portion (11) and an external registration portion (12). The detailed structure of the conventional optical disk (1), as shown in Figure IB, includes an annular substrate (13), a coated layer (14), and a compensation sheet (15). The coated layer includes a recording layer (141), a reflecting layer (142) and a protective layer (143), which are laminated sequentially on the annular substrate (13), forming the registration portion (12). The compensation sheet (15) is attached to the annular substrate (13) to cover the coated layer (14), thus providing the product of the optical disc (1). To reduce the manufacturing steps and decrease the production cost, another conventional form of an optical disc (2) as shown in Figure 2 has been developed. The main difference between the optical disc (2) and the optical disc (1) is that the optical disc (2) does not include a compensation sheet, and since the optical disc (2) lacks the compensation sheet, the thickness of the annular substrate (21) in the support portion (11) is increased so that a device for driving an optical disc can hold the optical disc (2) effectively. For example, the thickness of the optical disc (2) in the support portion (11) is approximately 1.2 mm, and in the registration portion, the thickness of the optical disc (2) is approximately 0.6 mm. Still another conventional form of the optical disc (3) is an improvement of the optical disc (2), wherein the difference is that the support portion (11) projecting from the annular substrate (33) has a plurality of indentations (31) in its outer periphery, as shown in the Figure 3A. Another difference in that the support portion (11) protruding from the annular substrate (33) has an inclined face (32) extending outward from its outer periphery, as shown in Figure 3B. The two features mentioned above allow the annular substrate 33 to be easily manufactured and have better mechanical properties. It is inevitable that when an optical disk is rotating in a drive device, a vibration is generated due to factors including the rotation of the spindle of the drive device, the vibration of the pickup head of the drive device and the turbulence of the air that appears on the drive device. When resonance occurs between the optical disk and any of the vibration factors mentioned above or during a high-speed read / write process, the rotational speed of the drive device spindle is greatly increased, and the vibration generated becomes more intense The compensation sheet having the optical disc (1) effectively increases the stiffness of the optical disc (1), and therefore, prevents the optical disc from being deformed due to vibration during the reading / writing process. However, the stiffness of the compensation sheet (15) could lead to warping of the disc optical if the surface quality of the compensation sheet (15) is poor, and thus affect the quality of the optical disc read / write; the warping could even return defective to the optical disk. The thickness of the optical discs (2), (3) in the registration portion (12) is only 0.6 mm, so that the optical discs (2), (3) are likely to be incompatible in reading situations / writing at high speed, due to vibration. To conclude from the above, it is important to solve the problem of optical disc vibration during the reading / writing process at different speeds, so that the compatibility of optical discs with insufficient rigidity can be improved, and optical discs can be produced more easily.

SUMMARY OF THE INVENTION In view of the problems mentioned above, an object of the invention is to provide an optical disk capable of suppressing vibration during the read / write process and a method for manufacturing such an optical disk, whereby the vibration of a optical disc can be decreased and the problem of vibration at all read / write speeds can be solved, and so that the compatibility of an optical disc having a registration portion and with insufficient stiffness, can be improved At the same time, when comparing the optical disc with the compensation sheet, the optical disc of the invention is easy to produce and therefore, the cost of production is effectively reduced. In order to achieve the object mentioned above, an optical disk capable of suppressing vibration during the read / write process of the invention includes an annular substrate, a coated layer and a damping layer. The annular substrate has an internal support portion, an external registration portion and a registration surface corresponding to the external registration portion. The coated layer is formed on the recording surface. The damping layer is formed on the side of the coated layer of the annular substrate and is used to increase the response time to vibration of an optical disc. The invention also discloses a method for manufacturing the optical disc mentioned above. The method comprises the steps of: manufacturing an annular substrate including an internal support portion, an external registration portion and a registration surface corresponding to the external registration portion; forming a coated layer on the recording surface and forming a damping layer on the side of the coated layer of the annular substrate.

With the optical disc capable of suppressing vibration during the reading / writing process of the invention, the vibration of an optical disc is effectively diminished, the vibration problem appearing at all read / write speeds is solved and the Compatibility of an optical disc having a registration portion and with insufficient rigidity is improved. In addition, warping of an annular substrate due to a poor surface quality of the damping layer will not occur when the damping layer is formed attached to the annular substrate. Therefore, the optical disc is easy to produce, the performance increases substantially and the production cost decreases.

BRIEF DESCRIPTION OF THE DRAWINGS Figure IA is a schematic diagram illustrating the top view of a conventional optical disk. Figure IB is a schematic diagram illustrating the structure of the conventional optical disk shown in Figure IA. Figure 2 is a schematic diagram illustrating the structure of another conventional optical disk. Figure 3A is a schematic diagram illustrating the top view of yet another conventional optical disk.

Figure 3B is a schematic diagram illustrating the structure of the conventional optical disc shown in Figure 3A. Figure 4 is a schematic diagram illustrating the structure of an optical disk capable of suppressing vibration during the read / write process, according to a preferred embodiment of the invention. Figure 5 is a flow diagram illustrating a method for manufacturing the optical disk of the invention. Figure 6A is a graph illustrating the axial focusing movement of the laser pickup head of a drive device when reading a conventional optical disk. Figure 6B is a graph illustrating the axial focusing movement of the laser pickup head of a drive device when reading the optical disc of the invention.

DETAILED DESCRIPTION OF THE INVENTION The optical disc capable of suppressing vibration during the read / write process and the method for manufacturing such an optical disk according to the preferred embodiments of the invention, will be described below with reference to the drawings, wherein Similar reference numbers denote similar components.

Referring to Figure 4, an optical disk (4) capable of suppressing vibration during the read / write process according to a preferred embodiment of the invention includes an annular substrate (43), a coated layer (44) and a layer of damping (45). The annular substrate (43) is provided with a supporting portion (41) on the inner side, a registration portion (42) on the outer side and a registration surface (431) corresponding to the registration portion (42) . The coated layer (44) is formed on the recording surface (431). The damping layer (45) is formed on the side of the coated layer (44) of the annular substrate (43) and is used to increase the response time to vibration of the optical disc. In other words, the soft damping layer (45) is used to increase the damping coefficient of the optical disk (4), so that the ability of the optical disk to resist a change (i.e., vibration) is improved. In Figure 4, the damping layer (45) is formed on only one portion of the optical disk (4); the preferred range of attachment is such that the outer diameter of the damping layer (45) is at least one third of the diameter of the optical disk (4). Take an optical disk with a diameter of 120 mm as an example; The external diameter of the damping layer would be between 40 mm and 120 mm Thus, the technical feature of the invention is applicable to optical discs of any size, for example, an optical disc with its diameter between 110 mm and 130 mm or between 70 mm and 90 mm. For the optical disc (4) shown in Figure 4, the thickness of the annular substrate (43) in the support portion (41) is greater than the thickness of the annular substrate (43) in the registration portion (42). For example, the thickness of the annular substrate (43) in the registration portion (42) is between 0.55 mm and 0.65 mm and the thickness of the annular substrate (43) in the support portion (41) is between 0.66 mm and 1.6 mm. Similarly, the annular substrate (43) may be similar to the annular substrate (33) shown in Figure 3, wherein the support portion (41) protruding from the registration surface (431) has a plurality of indentations in it. its outer periphery and / or has a sloping face extending outwardly from its outer periphery. The coated layer (44) includes at least one recording layer (441), at least one reflective layer (442) and a protective layer (443). The recording layer (441) is laminated to the recording surface (431) and is composed of an organic dye or an inorganic dye. The reflective layer (442) is located in the recording layer (441) and is composed of metal. The protective layer (443) is located in the reflective layer (442).

Those skilled in the art can modify the composition of a coated layer for different applications of an optical disc. For example, the coated layer (44) may include a first dielectric layer, a recording layer, a second dielectric layer, an insulating layer, a reflective layer and a protective layer, which are laminated sequentially on the recording surface (431). ), wherein the recording layer is composed of an alloy and the reflective layer is composed of metal. Similarly, if the optical disk is a read-only optical disk (ROM), where the data is written directly into the annular substrate (43), then the coated layer (44) simply includes a reflective layer and in a more preferred, further includes a protective layer. Figure 5 discloses a method for manufacturing the optical disc mentioned above according to a preferred embodiment of the invention. First, an annular substrate (43) (S51) is fabricated. Next, a coated layer (44) is formed on the registration surface (431) (S52). Finally, a damping layer (45) is formed on the side of the coated layer (44) of the annular substrate (43) (S53). Figure 6A illustrates the axial focusing movement of a laser pickup head of a laser device. drive when a conventional optical disk is read, and Figure 6B illustrates the axial focusing movement of a laser pickup head of a drive device when reading an optical disk of the invention. In order to focus the laser light on the coated layer of an optical disc, the laser pickup head moves along with the vibration of the optical disc, and therefore, the axial focusing movement of the laser pickup head can show the vibration of an optical disc. From Figures 6A and 6B, it can be seen that regardless of the position in the radius of the optical disc of the invention in which the laser pick-up head is located, its axial focusing movement is smaller than that of the laser pick-up head when it is located in the corresponding position in the radius of a conventional optical disk, which illustrates that the damping layer in the optical disk of the invention can change and effectively decrease the vibration of an optical disk during the read / write process. It should be noted that the description mentioned above is based on the attachment of a damping layer to a conventional optical disk without a compensation sheet. However, if an optical disk with a compensation blade attached to it still does not have sufficient rigidity, a buffer layer It can be formed in the compensation sheet to change and decrease the vibration of the optical disc. And when such an optical disc is manufactured, the compensation sheet must be placed before forming the cushion layer. With the optical disc capable of suppressing vibration during the read / write process and the method for manufacturing such an optical disc of the invention, the vibration of the optical disc can be changed and effectively decreased after the damping layer is formed, the vibration problem that appears at all the read / write speeds is solved, so that the compatibility of an optical disc having a registration portion and with insufficient rigidity is improved, and therefore, the optical disc can be read / write at different speeds. In addition, the cushion layer is composed of a soft material, and therefore, when attached to the annular substrate, the annular substrate will not warp due to a poor surface quality of the cushion layer. Therefore, the optical disk is easy to produce, the yield increases substantially and the production cost decreases. Although the invention has been described by way of example and in terms of the preferred embodiments, it is It will be understood that the invention is not limited to the embodiments described. On the contrary, it is intended to cover several modifications and similar arrangements, as would be evident to those with experience in the art. For example, an optical disk with a single-sided double layer or an optical disk with multiple layers, needs a reflective layer in each recording layer, and therefore, the coated layer of the optical disc of the invention can include more than a registration layer and a reflective layer. Therefore, the scope of the appended claims should be in accordance with the broadest interpretation, to cover all such modifications and similar arrangements.

INDUSTRIAL APPLICATION The invention provides an optical disk capable of suppressing vibration during the read / write process and a method for manufacturing such an optical disk, wherein the optical disk can be easily manufactured at a reduced cost and with a substantially increased performance. With the optical disc, the vibration problem that occurs at all read / write speeds is easily solved, and therefore, the optical disc can be compatible with different read / write situations.

Claims (24)

1. CLAIMS 1. An optical disk capable of suppressing vibration during the read / write process, comprising: an annular substrate having a support portion, a registration portion surrounding the support portion and a recording surface corresponding to the registration portion; a coated layer formed on the recording surface; and a damping layer formed on the side of the coated layer of the annular substrate, to increase the response time to vibration of the optical disk.
2. 2. The optical disk capable of suppressing vibration during the read / write process according to claim 1, wherein the outer diameter of the damping layer is greater than or equal to one third of the diameter of the optical disk, and is smaller that or equal to the diameter of the optical disc.
3. 3. The optical disk capable of suppressing vibration during the read / write process according to claim 1, wherein the thickness of the annular substrate in the support portion is greater than the thickness of the annular substrate in the registration portion.
4. 4. The optical disk capable of suppressing the vibration during the read / write process according to claim 3, wherein the thickness of the annular substrate in the support portion is between 0.66 mm and 1.6 mm, and the thickness of the annular substrate in the registration portion is between 0.55 mm and 0.65 mm. The optical disc capable of suppressing vibration during the read / write process according to claim 3, wherein the supporting portion of the annular substrate projecting from the recording surface has a plurality of indentations at its outer periphery. The optical disc capable of suppressing vibration during the read / write process according to claim 5, wherein the outermost periphery of the supporting portion of the annular substrate protruding from the recording surface is a sloping face. 7. The optical disk capable of suppressing vibration during the read / write process according to claim 2, wherein the diameter of the optical disk is between 110 mm and 130 mm or between 70 mm and 90 mm. 8. The optical disk capable of suppressing vibration during the read / write process according to claim 1, further comprising: a compensation sheet placed between the coated layer and the buffer layer, so that the The thickness of the annular substrate in the support portion is the same as the thickness of the annular substrate in the registration portion. The optical disc capable of suppressing vibration during the read / write process according to claim 1, wherein the coated layer comprises: at least one registration layer laminated on the registration surface; at least one reflective layer located respectively in each of the recording layer; and a protective layer located in the uppermost reflecting layer. The optical disc capable of suppressing vibration during the read / write process according to claim 9, wherein the reflective layer is composed of metal, and the recording layer is composed of an organic dye or an inorganic dye. The optical disc capable of suppressing vibration during the read / write process according to claim 1, wherein the coated layer comprises: a first dielectric layer located on the recording surface; a recording layer located in the first dielectric layer; a second dielectric layer located in the record layer; an insulation layer located in the second dielectric layer; a reflective layer located in the insulation layer; and a protective layer located in the reflecting layer. 12. The optical disk capable of suppressing vibration during the read / write process according to claim 11, wherein: the recording layer is composed of an alloy; and the reflective layer is composed of a metal. 13. A method for manufacturing an optical disc capable of suppressing vibration during the read / write process, the method comprising: making an annular substrate having a support portion, a registration portion surrounding the support portion and a surface of registration that corresponds to the registration portion; forming a coated layer on the recording surface; and forming a damping layer on the side of the coated layer of the annular substrate, to increase the response time to vibration of the optical disc. 14. The method for manufacturing an optical disc capable of suppressing vibration during the read / write process according to claim 13, wherein the outer diameter of the damping layer is greater than or equal to one third of the diameter of the optical disk and is more small that or equal to the diameter of the optical disc. The method for manufacturing an optical disc capable of suppressing vibration during the read / write process according to claim 13, wherein the thickness of the annular substrate in the support portion is greater than the thickness of the annular substrate in the portion of registry . The method for manufacturing an optical disc capable of suppressing vibration during the read / write process according to claim 15, wherein the thickness of the annular substrate in the support portion is between 0.66 mm and 1.6 mm, and the thickness of the annular substrate in the registration portion is between 0.55 mm and 0.65 mm. The method for manufacturing an optical disc capable of suppressing vibration during the read / write process according to claim 15, wherein the supporting portion of the annular substrate protruding from the recording surface has a plurality of indentations in its external periphery. 18. The method for manufacturing an optical disc capable of suppressing vibration during the read / write process according to claim 17, wherein the outermost periphery of the supporting portion of the annular substrate protruding from the recording surface is a sloped face. The method for manufacturing an optical disc capable of suppressing vibration during the read / write process according to claim 14, wherein the diameter of the optical disc is between 110 mm and 130 mm or between 70 mm and 90 mm. The method for manufacturing an optical disk capable of suppressing vibration during the read / write process according to claim 13, further comprising: placing a compensation sheet between the coated layer and the buffer layer, so that the thickness of the annular substrate in the support portion is the same as the thickness of the annular substrate in the registration portion. The method for manufacturing an optical disc capable of suppressing vibration during the read / write process according to claim 13, wherein the coated layer comprises: at least one registration layer laminated on the registration surface; at least one reflective layer located respectively in each of the recording layer; and a protective layer located in the uppermost reflecting layer. The method for manufacturing an optical disc capable of suppressing vibration during the read / write process according to claim 21, wherein the reflective layer is composed of metal and the recording layer is composed of an organic dye or an inorganic dye . The method for manufacturing an optical disc capable of suppressing vibration during the read / write process according to claim 13, wherein the coated layer comprises: a first dielectric layer located on the recording surface; a recording layer located in the first dielectric layer; a second dielectric layer located in the recording layer; an insulation layer located in the second dielectric layer; a reflective layer located in the insulation layer; and a protective layer located in the layer reflective The method for manufacturing an optical disc capable of suppressing vibration during the read / write process according to claim 23, wherein: the recording layer is composed of an alloy; and the reflective layer is composed of a metal.