KR19990013471A - Optical disk having a pattern and a method of manufacturing the same - Google Patents

Abstract

On the data recording area, an aluminum reflecting film is formed together with the reflecting film forming a pattern on the outer circumferential side of the data recording area. Although the same aluminum as the reflective film material on the data recording area can be used for the reflective film on the outer circumferential area, gold, titanium and the like can also be used. Therefore, an optical disk having a unique pattern formed in the outer circumferential region not conventionally used can be manufactured at low cost.

Description

Optical disk having a pattern and a method of manufacturing the same

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc and a method of manufacturing the same, and more particularly to an optical disc having a pattern around the outer periphery of a data recording area and a method of manufacturing such an optical disc.

Various types of optical discs are currently provided, such as compact disks (CDs), digital video disks (DVDs), magneto optical (MO) disks, and laser disks (LDs). have. CDs are standardized to have diameters of 12 cm and 8 cm.

1 is a plan view of a conventional CD having a diameter of 12 cm. Referring to FIG. 1, a central hole 2 is formed in the center of the CD 1 so as to be attached to the drive device. A data recording area 3 of 8 cm in diameter is provided at the inner circumference of the CD 1. A plurality of pit is formed in the data recording area 3 in accordance with the data. The data recording area 3 is covered with a reflective film. The outer circumferential region 4 of the optical disc 1 is generally colorless and transparent. The optical disc 1 is finished into a product by attaching a label on the back side of the light irradiation surface.

Since the conventional optical disc 1 has a colorless transparent outer circumferential region 4 as described above, it does not have a strong influence on the general consumer and attracts attention as a commercial product.

It is an object of the present invention to provide an economical optical disc having a pattern and a method of manufacturing the same.

According to a first aspect of the invention, the optical disk includes a transparent substrate and a reflective film. The transparent substrate includes a data recording area in which data is recorded on the inner circumference. The reflective film has a first area formed on the data recording area of the transparent substrate and a second area forming a pattern on the area on the outer circumferential side of the data recording area of the transparent substrate.

By using the reflective film formed on the data recording area, an optical disk having a pattern formed in the outer circumferential area can be manufactured at low cost.

According to another feature of the invention, the optical disk comprises a transparent substrate, a first reflecting film, and a second reflecting film. The transparent substrate has a data recording area in which data is recorded on the inner circumference of the optical disk. The first reflective film is formed on the data recording area of the transparent substrate. The second reflecting film is formed on the area on the outer circumferential side of the data recording area of the transparent substrate and forms a pattern. Preferably, the second reflecting film has a color different from that of the first reflecting film.

In this aspect, an optical disk having a pattern in the transparent outer circumferential region can be manufactured at low cost.

According to another feature of the invention, an optical disk manufacturing method including a transparent substrate having a data recording area in which data is recorded on the inner circumference of the optical disk is different from the data recording area of the transparent substrate and the outer circumference of the data recording area. Attaching a mask and forming a pattern on an area located on the side; Forming a reflective film on the transparent substrate to which the mask is attached, and removing the mask from the transparent substrate.

According to the above manufacturing method, a reflective film is formed which forms a pattern on the outer circumferential side of the data recording area in the step of forming the reflective film on the data recording film. Therefore, the optical disk having a pattern can be manufactured at low cost without increasing the number of manufacturing steps.

According to another feature of the invention, a method of manufacturing an optical disc including a transparent substrate having a data recording area in which data is recorded on the inner circumference of the optical disc comprises a first mask on an area different from the data recording area of the transparent substrate. Attaching; Forming a first reflective film on the transparent substrate to which the first mask is attached; Removing the first mask from the transparent substrate; Attaching a second mask on an area excluding the area forming the pattern and the area located on the outer circumferential side of the data recording area of the transparent substrate; Forming a second reflective film on the transparent substrate to which the second mask is attached; And removing the second mask from the transparent substrate. Preferably, the second reflecting film has a color different from that of the first reflecting film.

In the above manufacturing method, a reflective film is provided which forms a pattern on the outer circumferential side of the data recording area in the step of forming the reflective film on the data recording area. Therefore, an optical disk having a pattern can be manufactured at low cost. Since the color of the reflective film forming the pattern is different from the color of the reflective film in the data recording area, a much more colorful optical disk can be manufactured at low cost.

Further objects, features, features and advantages of the present invention will become apparent from the following detailed description of the invention when they are mentioned in connection with the accompanying drawings.

1 is a plan view of a conventional optical disk seen in a plane of light incidence.

2 is a plan view of an optical disk according to a first embodiment of the present invention as viewed in the plane of light incidence;

3 is a cross-sectional view of the optical disk of FIG. 2 taken along line III-III.

4A is a cross-sectional view of the transparent substrate of the optical disk of FIGS. 2 and 3 seen from the signal recording plane.

4B is a plan view illustrating attaching a mask on the transparent substrate of FIG. 4A.

4C is a plan view illustrating a step of forming a reflective film subsequent to the step of FIG. 4B.

4D is a plan view illustrating a step of removing a mask subsequent to the step of FIG. 4C.

5A is a cross-sectional view taken along the line VA-VA of FIG. 4A.

5B is a cross-sectional view taken along the line VB-VB in FIG. 4B.

5C is a cross-sectional view taken along the line VC-VC of FIG. 4C.

FIG. 5D is a cross-sectional view taken along the line VD-VD in FIG. 4D. FIG.

FIG. 5E is a cross-sectional view illustrating a step of forming a protective film subsequent to the step of FIG. 5D.

6 is a plan view of an optical disk according to a second embodiment of the present invention as viewed in the plane of light incidence;

FIG. 7 is a cross-sectional view of the optical disk of FIG. 6 taken along line III-III. FIG.

8 is a plan view of the optical disk of FIG. 6 having a data recording area represented by broken lines;

9 is a plan view of an optical disk according to a third embodiment of the present invention as viewed in the plane of light incidence.

10 is a cross-sectional view of the optical disk of FIG. 6 taken along the X-X line.

11A is a plan view of the optical disc of FIGS. 9 and 10 indicating the step of attaching a mask subsequent to the step shown in FIG. 4B in the method of manufacturing the optical disc.

11B is a plan view illustrating a step of forming a reflective film subsequent to the step of FIG. 11A.

11C is a plan view illustrating a step of removing a mask subsequent to the step of FIG. 11B.

FIG. 11D is a plan view illustrating attaching another mask subsequent to the step of FIG. 11C. FIG.

FIG. 11E is a plan view illustrating a step of forming another reflective film subsequent to the step of FIG. 11D; FIG.

FIG. 11F is a plan view illustrating a step of removing a mask subsequent to the step of FIG. 11E. FIG.

FIG. 11G is a plan view illustrating the step of attaching the mask subsequent to the step of FIG. 11F.

11H is a plan view illustrating a step of forming another reflective film subsequent to the step of FIG. 11G;

11I is a plan view illustrating a step of removing a mask subsequent to the step of FIG. 11H.

12A is a cross-sectional view taken along the line IIA-XIIA of FIG. 11A.

12B is a cross-sectional view taken along the line IIB-XIIB of FIG. 11B.

12C is a cross-sectional view taken along the line IIC-XIIC of FIG. 11C.

FIG. 12D is a cross-sectional view taken along the line XXXIID-XXXIID in FIG. 11D; FIG.

12E is a cross-sectional view taken along the line IIII-XIIE of FIG. 11E.

FIG. 12F is a cross-sectional view taken along the line IIF-XIIF of FIG. 11F; FIG.

Fig. 12G is a cross-sectional view taken along the line IIG-XIIG in Fig. 11G.

12H is a cross-sectional view taken along the line IIH-XIIH of FIG. 11H.

FIG. 12I is a cross-sectional view taken along the line IIII-XIIII of FIG. 11I; FIG.

Fig. 13 is a plan view of an optical disc according to a fourth embodiment of the present invention as seen from the plane of light incidence.

FIG. 14 is a cross-sectional view of the optical disk of FIG. 13 taken along line VIV-IVV. FIG.

FIG. 15A is a plan view showing a step of forming a transparent protective film following the step in FIG. 11C in the manufacture of the optical disk according to the fifth embodiment of the present invention; FIG.

FIG. 15B is a plan view illustrating a step of printing a pattern subsequent to the step of FIG. 15A. FIG.

FIG. 16A is a cross-sectional view taken along the line XVIA-XVIA in FIG. 15A; FIG.

FIG. 16B is a cross-sectional view taken along the line XVIB-XVIB of FIG. 15B; FIG.

Explanation of symbols for the main parts of the drawings

1: optical disc

2: concourse

3, 7: reflective film

4: outer circumferential region

5: transparent substrate

6: data recording area

8: transparent protective film

9: label

10: inner mask

11: outer mask

Embodiments of the present invention are described in detail below with reference to the drawings. In the drawings, the same or corresponding components are assigned the same reference signs and the description thereof will not be repeated.

First embodiment

2 and 3, the optical disk 1 according to the first embodiment of the present invention is a circular transparent substrate 5 formed of polycarbonate resin, glass, etc., an annular reflective film 3 formed of aluminum, formed of aluminum A star-shaped reflective film 7, a transparent protective film 8 formed to cover the entire signal recording surface 5A opposite to the light incident surface 5B, and a label 9 attached to the protective film 8;

The transparent substrate 5 comprises an annular data recording area 6 on the inner circumference at which data is written, and a central hole 2 in the center for attachment to the drive device. A plurality of pits are formed concentrically or helically in accordance with the data in the data recording area 6. The reflective film 3 is formed on the signal recording plane 5A of the transparent substrate 5 to cover the data recording area 6 as a whole. The reflective film 7 is formed on the signal recording plane 5A in the outer circumferential region 4 located on the outer circumferential side of the data recording region 6. The reflective film 7 forms a star pattern.

Four reflective films 7 are now formed at regular intervals from the reflective film 3. The reflective films 3 and 7 are all made of aluminum and are similarly silver.

The reflective film 7 is not limited to the pattern shown in FIG. For example, the reflective film 7 may be formed to have a pattern such as a sign. Another four reflective films of the crescent pattern can be inserted between the four star shaped reflective films 7. The reflective film 7 can form various patterns according to the application of the optical disk.

The method of manufacturing the optical disc 1 is described above with reference to Figs. 4A-4D and 5A-5E.

As shown in Figs. 4A and 5A, a transparent substrate 5 having a central hole 6 and a data recording area 6 is prepared.

As shown in Figs. 4B and 5B, the inner mask 10 and the outer mask 11 are different from the data recording area 6 (dashed line area in Fig. 4B) and the outer circumferential side of the data recording area 6 Attached to the area located at and forms a pattern (open area in FIG. 4B). The inner mask 10 covers the center area inside the data recording area 6. The outer mask 11 covers the outer circumferential region 4 outside the data recording region 6. Since the outer mask 11 has four star openings 12, the outer mask 11 does not cover the area forming the star pattern.

As shown in Figs. 4C and 5C, the reflective film 13 is formed by the vapor deposition method on the transparent substrate 5 to which the inner and outer masks 10 and 11 are attached. Since the transparent substrate 5 is partially masked as described above, the reflective film 13 is not in direct contact with the unmasked area.

4D and 5D, the inner and outer masks 10 and 11 are removed from the transparent substrate 5. As a result, a part of the reflecting film 13 formed on the data recording area 6 remains as the reflecting film 3 while a part of the reflecting film 13 formed on the area corresponding to the star pattern is the reflecting film 7. Remains. Therefore, the reflective film 3 is located on the data recording area 6, and the reflective film 7 is located on the outer circumferential area 4 to form a star pattern.

Referring to FIG. 5E, a transparent protective film 8 is formed on the transparent substrate 5 on which the reflective films 3 and 7 are formed.

Next, as shown in FIG. 3, the label 9 is fixed on the protective film 8 to complete the optical disc 1.

According to the first embodiment of the present invention, a star pattern is added to the outer circumferential region 4 which is not used in the conventional disk. Therefore, the optical disc 1 is improved to be a product of interest. Since the reflective film 7 forming the pattern is formed together with the reflective film 3 on the data recording area 6, the number of process steps is not increased. Thus, the optical disc 1 can be manufactured economically.

Second embodiment

The optical disc 1 according to the second embodiment of the present invention shown in FIGS. 6 and 7 has one sheet of reflective film 14 which forms a star-shaped pattern as a whole instead of the above-described reflective films 3 and 7. ). The reflective film 14 of the second embodiment is formed to cover the entire data recording area 6 and extends to the outer circumferential area 4 as shown in FIG. The portion of the outer circumferential region 4 forms a pattern.

Although the reflective film forming the pattern is spaced apart from the reflective film 3 on the data recording area 6 as in the first embodiment, the reflective film forming the pattern is the data recording area 6 as in the second embodiment. ) May be in contact with the reflective film.

In the present invention, the reflective film 14 forms a star-shaped pattern as a whole. Alternatively, patterns such as snow crystal patterns, character patterns, and the like may be formed.

Third embodiment

The optical disk 1 according to the third embodiment of the present invention shown in FIGS. 9 and 10 uses two gold reflecting films 15 and two titanium reflecting films 16 instead of the aluminum reflecting film 7 shown in FIG. 2. Include. Therefore, the reflective films 3, 15 and 16 all have different colors. As a result, the optical disc 1 according to the third embodiment is more colorful than the optical disc of the first embodiment.

The method of manufacturing the optical disc 1 of this embodiment is described below with reference to FIGS. 11A-11I and 12A-12I.

After preparing the transparent substrate 5 having the data recording area 6 as shown in Figs. 4A and 5A, the inner mask 10 and the outer mask 11 are as shown in Figs. 11A and 12A. It is attached on an area different from (6). The inner mask 10 covers the center area located inward of the data recording area 6. The outer mask 11 covers the outer circumferential region 4 located on the outer side of the data recording region 6. The outer mask 11 has no opening area shown in FIG. 4B.

11B and 12B, the aluminum reflective film 13 is formed by vapor deposition on the transparent substrate 5 to which the inner and outer masks 10 and 11 are attached. Therefore, the reflective film 13 is in direct contact with the unmasked data recording area 6.

11C and 12C, the inner mask 10 and the outer mask 11 are separated from the transparent substrate. As a result, only the area of the reflective film on the data recording area 6 from the reflective film 13 on the transparent substrate 5 remains as the reflective film 3. Therefore, no reflective film is formed on the outer circumferential region 4.

11D and 12D, a mask 17 is attached to the transparent substrate 5 on which the reflective film 3 is formed. The mask 17 has two star openings 18. This opening 18 is located in the outer circumferential region 4 of the transparent substrate 5 and on the region forming the pattern. Therefore, an area different from the area forming such a pattern is masked.

11E and 12E, a gold reflecting film 19 is formed by vapor deposition on the transparent substrate 5 to which the mask 17 is attached. Since the area forming the pattern is not masked, the reflective film 19 is in direct contact with the exposure area.

11F and 12F, the mask 17 is removed from the transparent substrate 5. As a result, only a part of the reflective film 19 located on the area forming the pattern remains from the reflective film 19 formed entirely on the transparent substrate 5.

11G and 12G, if the two openings 18 are positioned 90 ° differently from the opening in FIG. 11D, the mask 17 is placed on the transparent substrate 5 on which the transmissive films 3 and 15 are formed. Is attached again.

11H and 12H, a titanium reflecting film 20 is formed on the transparent substrate 5 to which the mask 17 is attached. Since the area forming the star pattern is not masked, the reflective film 20 is in direct contact with the exposure area.

11I and 12I, the mask 17 is removed from the transparent substrate 5. As a result, only a part of the reflective film 20 located on the region forming the star pattern remains from the reflective film 20 formed on the transparent substrate 5. Therefore, the aluminum reflecting film 3, the gold reflecting film 15 forming the star pattern, and the titanium reflecting film 16 forming the star pattern are located on the transparent substrate 5.

Following formation of a transparent protective film 8 similar to the step of FIG. 5E, a label 9 is deposited on the protective film 8 as shown in FIG. 10. Thus, the optical disc 1 is completed.

According to the third embodiment of the present invention, the optical disk 1 having three different colors can be manufactured at low cost.

Although gold and titanium were used to form patterns in the embodiments of the present invention, respectively, for the reflective films 15 and 16, metals other than aluminum such as copper, nickel, antimony, manganese, and vapor deposition could be deposited. Any other metal that may be used may be used. In addition, plastic may be used in addition to the metal. Moreover, the pattern can be printed directly instead of providing a reflective film that forms the pattern by vapor deposition.

In this embodiment, a pattern with two colors is provided by swapping the mask twice. A pattern having three or more colors can be provided by replacing the mask three or more times.

Fourth embodiment

In contrast to the optical disk shown in FIG. 6 in which the reflecting film 14 is formed only of aluminum over the data recording area 6 and the outer circumferential area 4, the optical disk 1 according to the fourth embodiment of the present invention. Has an aluminum reflecting film 3 formed on the data recording area 6 and a gold reflecting film 21 formed on the outer circumferential area 40. As a result, the optical disk 1 has two types of colors.

Fifth Embodiment

In contrast to the optical disks of the first to fourth embodiments in which the reflective film forming the pattern is provided by vapor deposition, the optical disk of the fifth embodiment has a pattern formed by screen printing.

In order to manufacture such an optical disc, formation of an aluminum reflecting film by vapor deposition on the data recording area of the transparent substrate as shown in Fig. 11C is followed by the transparent protective film 8 as shown in Figs. 15A and 16A. Is formed.

Referring to FIGS. 15B and 16B, films 22a-22d forming a star pattern are printed on the transparent protective film 8 and on the outer circumferential region 4 on the outer circumferential side of the data recording region 6 or the like. Is formed by.

The pattern is printed in the fifth embodiment. Therefore, an optical disk having multiple color patterns such as silver reflecting film 3, red film 22A, blue film 22B, yellow film 22C and green film 22D can be manufactured at low cost.

In this embodiment, the reflective film is formed by vapor deposition. However, its formation is not limited to this process and may be formed by, for example, CVD. In this embodiment, the mask is attached on the transparent substrate. Alternatively, the mask may be formed by a photoresist method on the transparent substrate.

Although the present invention has been described and illustrated in detail, it is to be clearly understood that the present invention is shown only by way of illustration and illustration, and should not be regarded as limiting, and that the spirit and scope of the present invention is limited only by the appended claims.

In the above manufacturing method, a reflective film is provided which forms a pattern on the outer circumferential side of the data recording area in the step of forming the reflective film on the data recording area. Therefore, an optical disk having a pattern can be manufactured at low cost. Since the color of the reflective film forming the pattern is different from the color of the reflective film in the data recording area, a much more colorful optical disk can be manufactured at low cost.

Claims (14)

In an optical disc, A transparent substrate having a data recording area where data is recorded on its inner circumference, and A reflective film comprising a first region formed on the data recording region of the transparent substrate and a second region forming a pattern on an outer circumferential side region of the data recording region of the transparent substrate An optical disk comprising a. In an optical disc, A transparent substrate having a data recording area where data is recorded on its inner circumference, A first reflective film formed on the data recording area of the transparent substrate, and A second reflective film forming a pattern on an outer circumferential side region of the data recording region of the transparent substrate An optical disk comprising a. The method of claim 2, And the second reflecting film is in contact with the first reflecting film. The method of claim 2, And the second reflecting film is spaced apart from the first reflecting film. The method of claim 2, And the second reflecting film has a color different from that of the first reflecting film. The method of claim 2, And a third reflecting film forming a pattern on an outer circumferential side area of the data recording area of the transparent substrate. The method of claim 6, And the third reflecting film has a color different from that of the first and second reflecting films. In an optical disc, A transparent substrate having a data recording area where data is recorded on its inner circumference, A reflective film formed on the data recording area of the transparent substrate, A transparent protective film formed on an outer circumferential side area of the data recording area of the transparent substrate, and A film printed on the transparent protective film and forming a pattern An optical disk comprising a. A method of manufacturing an optical disc comprising a transparent substrate having a data recording area where data is recorded on its inner circumference, Attaching a mask and forming a pattern on the data recording area of the transparent substrate and an area except the area located on the outer circumferential side of the data recording area; Forming a reflective film on the transparent substrate to which the mask is attached, and Removing the mask from the transparent substrate Optical disk manufacturing method comprising a. A method of manufacturing an optical disc comprising a transparent substrate having a data recording area where data is recorded on its inner circumference, Attaching a first mask on an area different from the data recording area of the transparent substrate Forming a first reflective film on the transparent substrate to which the first mask is attached; Removing the first mask from the transparent substrate, Attaching a second mask on an area different from the area located on the outer circumferential side of the data recording area of the transparent substrate, Forming a second reflective film on the transparent substrate to which the second mask is attached, and Removing the second mask from the transparent substrate Optical disk manufacturing method comprising a. The method of claim 10, And the second reflecting film has a color different from that of the first reflecting film. The method of claim 10, Attaching a third mask and forming a pattern on an area different from the area located on the outer circumferential side of the data recording area of the transparent substrate, Forming a third reflective film on the transparent substrate to which the second mask is attached, and Removing the third mask from the transparent substrate Optical disk manufacturing method comprising a. The method of claim 12, And the third reflecting film has a color different from that of the first and second reflecting films. A method of manufacturing an optical disc comprising a transparent substrate having a data recording area where data is recorded on its inner circumference, Attaching a mask on an area different from the data recording area of the transparent substrate Forming a reflective film on the transparent substrate having the mask attached thereto; Removing the mask from the transparent substrate, Forming a transparent protective film on the transparent substrate on which the reflective film is formed, and Printing a pattern on the transparent protective film and on the outer circumferential side of the data recording area of the transparent substrate; Optical disk manufacturing method comprising a.