JP3684775B2 - Optical recording medium manufacturing method and manufacturing apparatus therefor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing an optical recording medium in which two recording substrates provided with fine irregularities for recording information such as phase pits and pregrooves are bonded together with a bonding material. And its manufacturing equipment It is about.
[0002]
[Prior art]
Conventionally, as an optical recording medium for recording various types of information for audio, video, and other various types, optical discs, magneto-optical discs, and the like that perform recording and / or reproduction by light irradiation have been provided. On the surface, fine irregularities such as phase pits and pregrooves for information recording are formed. In response to a demand for a large capacity of information recording, an optical recording medium having a multilayer recording surface structure in which information recording surfaces are formed in two or more layers is provided.
[0003]
In general, an optical recording medium having a multilayer recording surface structure is integrally joined by bonding two recording substrates each provided with an information recording surface by using a bonding material made of a liquid resin. It is configured. In order to bond the two recording substrates with a bonding material, a bonding material coating method called a spin coating method is generally used.
[0004]
In this spin coating method, after a liquid resin as a bonding material is dropped on the mating surface of the recording substrate, the recording substrate is rotated to extend the liquid resin by centrifugal force, and a uniform liquid resin film is formed on the recording substrate. Is formed. After the two recording substrates coated with the bonding material in this way are overlapped with each other so as to sandwich the liquid resin, the liquid resin is cured to form a separation layer between two layers, thereby forming a two-layer recording surface An optical recording medium having a structure is configured.
[0005]
[Problems to be solved by the invention]
However, in such a conventional method for producing an optical recording medium, when two recording substrates in which the bonding material is applied to substantially the entire surface of the bonding surface are bonded by a coating means such as a spin coating method, the bonding material is used. When the mating surfaces coated with each other are superposed, it is difficult to prevent air from entering the mating surfaces, and there is a problem that air bubbles enter the bonding material. Thus, when bubbles enter the bonding material, the shape of fine irregularities such as phase pits and pregrooves collapses, making it difficult to read out information signals, which is a problem in terms of quality as an optical recording medium.
[0006]
For this reason, conventionally, two recording substrates are bonded together in a state where no bubbles enter the bonding material, or after two recording substrates are bonded together on the assumption that bubbles enter. By removing the bubbles that have entered the inside of the bonding material with a removing device, the above-mentioned problems due to the mixing of bubbles are prevented.
[0007]
For example, the former is a case where a bonding material is applied to two recording substrates, and then the bonding operation is performed in a vacuum apparatus in a state where the possibility of air being mixed is removed. Moreover, as an example of the latter, when two recording substrates are bonded together through a bonding material, the bubbles that have entered the bonding material are vacuum-ground using a vacuum device for defoaming. Etc. However, in both cases of the bonding operation in the vacuum device and the defoaming operation using the vacuum device, a special device called a vacuum device is required, which not only increases the equipment cost during production. The problem is that an increase in production time is unavoidable.
[0008]
Therefore, in order to avoid such a problem, the following method is generally performed. It is a state in which a bonding material is applied in a ring shape at an appropriate position on both or one of the two recording substrates to be bonded together, and the two recording substrates are overlapped with the bonding material sandwiched therebetween. It is rotated integrally, and the bonding material is spread by a spin coating method so as to shake off the bonding material by centrifugal force so as to obtain a predetermined quality.
[0009]
When this spin coating method is used, the bonding material flows outward by centrifugal force. Therefore, the bonding material is extended by centrifugal force at the outer periphery from the position where the recording material bonding material was first applied. There is no problem to spread. However, since the inner peripheral portion is opposite to the direction of centrifugal force acting from the first application position of the bonding material, the inner peripheral portion cannot receive the spreading action of the bonding material due to centrifugal force, and is simply pasted. Only the natural closeness of the bonding material based on the capillary phenomenon at the time of bonding can be expected.
[0010]
Such natural deviation due to the capillary phenomenon of the laminated material is affected by the difference in the surface condition of the recording substrate (surface roughness such as unevenness, etc.), the difference in so-called “wetting”, etc. If the laminating material does not become uniform in the part and a clean circle is not formed, not only the appearance looks bad, but also there may be a problem in quality during recording and reproduction. Therefore, when the deviation of the bonding material to the inner peripheral portion is insufficient, or when the deviation is disjoint, forcibly vacuum grinding using a vacuum device as described above, the bonding material is I tried to force it to the inner periphery.
[0011]
The present invention has been made in view of such a conventional problem. The bonding material is applied twice to the bonding surfaces of the two recording substrates to be bonded, and the first bonding material is applied. The method of manufacturing an optical recording medium in which the surface of the bonding surface is smoothed to a certain extent, the spread is facilitated by application of the second bonding material, and the shift of the bonding material to the inner peripheral portion can be controlled substantially uniformly. And its manufacturing equipment The purpose is to provide.
[0012]
[Means for Solving the Problems]
The method for producing an optical recording medium of the present invention solves the above-described problems and achieves the above object, and at least one of the mating surfaces of the first recording substrate and the second recording substrate bonded together. The whole surface A first application step of applying a liquid first bonding material to the substrate, and a mating surface of the first recording substrate and the second recording substrate At least one of Of the first laminated material applied Radially outward from the first application position Second bonding material In a ring A first coating substrate and a second recording substrate by superimposing a first bonding material and a second bonding material on the first recording substrate and the second recording substrate; It is characterized by passing through the extending process which extends a 1st bonding material and a 2nd bonding material in between.
[0013]
Since the present invention is configured as described above, at least one mating surface of two recording substrates to be bonded together The whole surface The first bonding material is applied to the two, and then at least one bonding surface of the two recording substrates On the outside in the radial direction from the first application position of the first bonding material. After applying the second bonding material, the two recording substrates are overlapped so as to sandwich the first and second bonding materials. Thereby, the surface of the mating surface is formed to a certain degree of smoothness by application of the first laminating material, and the second laminating material with improved fluidity is easily spread by this first laminating material, and therefore, It is possible to make the deviation of the bonding material toward the inner peripheral portion substantially uniform.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 7 are for explaining a method for producing an optical recording medium according to the present invention. FIGS. 1 to 6 show that a bonding material is applied to two recording substrates constituting the optical recording medium according to the present invention. FIG. 7 is an explanatory view showing an example of a manufacturing apparatus used for carrying out this optical recording medium manufacturing method.
[0015]
8 to 10 are for explaining another example of the method for producing an optical recording medium of the present invention, and FIG. 8 is an explanatory diagram showing a second example of the method for producing an optical recording medium of the present invention. FIG. 9 is an explanatory view showing a third example of the manufacturing method of the optical recording medium of the present invention, and FIG. 10 is an explanatory view of a fourth example of the manufacturing method of the optical recording medium of the present invention.
[0016]
In the following description, for example, the first recording substrate Da and the second recording substrate Db each having a central hole in which fine irregularities for information recording such as data information recording pits and tracking pregrooves are respectively formed are described in the first. ROM (read only memory) type two-layer optical disk formed by laminating information recording surfaces provided on each of the recording substrates Da and Db in two layers, which are joined by the bonding material 1 and the first bonding material 2 Is applied.
[0017]
In the two-layer optical disk as the optical recording medium OD, the information signals recorded on the first and second information recording surfaces are selectively selected by irradiating the two-layer information recording surface with a light beam from one surface. The single-sided reproduction optical disc that can be read and reproduced, the single-sided recording / reproduction optical disc that can record information as well as the reproduction, and the light beam from both sides separately for the two-layer information recording surface A double-sided reproduction optical disc that can be reproduced by individually reading out information signals recorded on the first and second information recording surfaces by irradiation and double-sided recording capable of recording information signals as well as reproduction. Although there are reproduction optical discs, the present invention can be applied to any of these optical discs.
[0018]
Further, the present invention is not limited to such a two-layer optical disc, and can be applied to, for example, an optical disc having three or more layers on which three or four or more recording substrates are stacked. Furthermore, the present invention is not limited to an optical disc, and is an optical recording medium having a central hole serving as a center of rotation, for example, a magneto-optical disc, a phase change optical disc, and an information recording surface having fine irregularities for information recording Can be applied to various optical recording media in which two or more layers are stacked.
[0019]
In this example, when the optical recording medium OD is a double-sided reproduction optical disk or a double-sided recording / reproduction optical disk, the first recording substrate Da and the second recording substrate Db constituting the optical recording medium OD have the same configuration. However, when the optical recording medium OD is a single-sided reproduction optical disk or a single-sided recording / reproduction optical disk, the first recording substrate Da and the second recording substrate Db have slightly different configurations. Also in this case, one recording substrate of the double-sided optical disc and the single-sided optical disc, for example, the first recording substrate Da can be made common.
[0020]
That is, in the case where the optical recording medium OD is a reproduction-only or dual-use optical disc that irradiates light beams from both sides, the first recording substrate Da and the second recording substrate Db have the same configuration. A central hole d serving as a center of rotation is provided at the center of the disk-shaped recording substrates Da and Db for positioning when mounted on the drive device. On one surface of the first and second recording substrates Da and Db, fine irregularities for information recording such as data information recording bits and tracking pregrooves are provided as information recording surfaces, for example, polycarbonate (PC), It is formed by injection molding using a transparent resin such as polymethyl methacrylate (PMMA). A reflective film made of, for example, an aluminum vapor deposition film is formed on the surface of the fine irregularities, thereby forming an information recording surface.
[0021]
When the optical recording medium OD is a reproduction-only or recording / reproduction single-sided optical disc that irradiates a light beam from one side, the first recording substrate Da is the first recording substrate Da of the double-sided optical disc described above. It has the same structure, has a central hole d, and is provided with fine irregularities on one side as an information recording surface. Similarly, it is formed by injection molding using a transparent resin such as polycarbonate (PC) or polymethyl methacrylate (PMMA). Is done. Similarly, a reflective film made of an aluminum vapor deposition film or the like is formed on the surface of the fine irregularities, thereby forming an information recording surface.
[0022]
On the other hand, the second recording substrate Db of the single-sided optical disc has the same configuration of the substrate body as the first recording substrate Da, but the configuration of the fine uneven surface formed as the information recording surface is different. That is, a semitransparent film made of, for example, silicon nitride (SiN) is formed on the surface of the fine irregularities of the second recording substrate Db, thereby forming an information recording surface.
[0023]
1A and 1B are provided on at least one of the surfaces of the first recording substrate Da and the second recording substrate Db having such a configuration to be bonded to each other on the fine unevenness side (hereinafter referred to as “mating surface”). As shown, a first laminating material 1 made of a liquid resin made of a photocurable resin that cures when irradiated with light is applied and used as an inner peripheral wetting material. As such a photocurable resin, for example, an ultraviolet curable liquid resin (SD301 manufactured by Dainippon Ink Science Co., Ltd.) that is cured by irradiation with ultraviolet rays can be used.
[0024]
The application position of the first bonding material 1 depends on the viscosity of the bonding material to be used. In this embodiment, an ultraviolet curable liquid resin (SD301) having a viscosity of 500 cps (at 25 ° C.). Was applied in an annular fashion from the center of the center hole d to a position of radius R1 (= 22 mm). The inner peripheral portion close to the center hole d on the inner side from the application position of the first bonding material 1 is a non-information recording surface on which fine irregularities are not formed. The non-information recording surface is provided with a ring-shaped relief groove 3 that is continuous in the circumferential direction. The relief groove 3 is a specific example of a recess that prevents the bonding material from protruding from the center hole d. Is shown.
[0025]
Next, as shown in FIGS. 1A and 1B, the first recording substrate Da and the second recording substrate Db on which the first bonding material 1 is applied at a predetermined position are individually subjected to a centrifugal shaker, and each of the first recording substrate 1 and the second recording substrate Db is separately manufactured. Shake off the pasting material 1. As a result, as shown in FIGS. 2A and 2B, the first bonding material 1 is spread substantially uniformly with a substantially constant thickness on the mating surfaces of the first and second recording substrates Da and Db.
[0026]
Subsequently, the first bonding material 1 applied to at least one of the bonding surfaces of the first and second recording substrates Da and Db (in the case of the example of FIG. 9 described later, the recording without the bonding material applied). As shown in FIGS. 3A and 3B, a second bonding material 2 made of a liquid resin made of a photocurable resin that is cured by being irradiated with light is applied to the bonding surface of the substrate, and this is mainly bonded. Used as an agent. As such a photocurable resin, for example, the above-described ultraviolet curable liquid resin (SD301 manufactured by Dainippon Ink & Chemicals, Inc.) that is cured by irradiation with ultraviolet rays can be used.
[0027]
Similarly to the first bonding material 1, the application position of the second bonding material 2 depends on the viscosity of the bonding material to be used. In this embodiment, the viscosity is 500 cps (25 UV curable liquid resin (SD301) is used. And it apply | coated to the position of radius R2 (= 37 mm) from the center of the center hole d continuously in the shape of a ring. In addition, the application shape of the 1st bonding material 1 and the 2nd bonding material 2 is not limited to the shape which continues in a ring shape like this example, For example, it is intermittent at predetermined intervals in the circumferential direction. It is possible to apply various kinds of shapes, such as a continuous application in a waveform in the circumferential direction, and other various shapes.
[0028]
Next, as shown in FIG. 4, the first recording substrate Da and the second recording substrate Db are opposed to the bonding surfaces to which the first bonding material 1 and the second bonding material 2 are applied, respectively. . Then, as shown in FIG. 5, the recording substrates Da and Db are overlapped so as to sandwich the first and second bonding materials 1 and 2 therebetween. Thereby, the 2nd bonding material 2 is spread in all directions along the surface of the 1st bonding material 1, and is extended over the substantially whole surface of a bonding surface.
[0029]
In this case, the first bonding material 1 serves as a guide member, and the second bonding material 2 flows and spreads along the surface of the first bonding material 1. A sufficient amount of the bonding material 2 can smoothly flow even inside the recording substrates Da and Db in the radial direction. As a result, the deviation of the second bonding material 2 toward the inner periphery becomes substantially uniform, and a beautiful circle can be formed with the bonding material to improve the appearance and improve the quality during recording and reproduction. Can do.
[0030]
Of the second bonding material 2 that has approached the inner periphery, the excess material enters the escape groove 3 and is retained in the escape groove 3 so that it does not protrude toward the center hole d. Accordingly, it is possible to maintain the aesthetic appearance of the center hole d portion, and to maintain a high clamp area strength, thereby achieving a highly stable clamp.
[0031]
Next, the laminated recording substrates Da and Db stacked as shown in FIG. 5 are placed on a turntable (centrifugal shaker) having a horizontal plane arranged in the horizontal plane. The rotary base is provided with a central axis coaxially with the rotary axis, and the central hole d of the bonded recording substrates Da and Db is fitted to the central axis, and fixing means such as, for example, a spring-compression chuck. Fixed by. Then, the rotary table is driven to rotate, and the bonded recording substrates Da and Db are rotated together under a predetermined rotation condition (for example, rotated at 3000 rpm for 2.5 seconds).
[0032]
As a result, as shown in FIG. 6, the intermediate film 4 made of a transparent resin in which the first and second bonding materials 1 and 2 are appropriately mixed and extended so as to have a substantially uniform thickness is separated between the two layers. Formed as a layer. As a result, the first recording substrate Da and the second recording substrate Db are integrally joined using the intermediate film 4 as an adhesive, thereby forming one optical recording medium OD.
[0033]
As the configuration of the information recording surface, various structures such as a magneto-optical recording layer and a phase change recording layer can be applied as long as fine irregularities are formed. Moreover, in the example mentioned above, although the 1st bonding material 1 and the 2nd bonding material 2 used the same liquid resin, they satisfy | fill predetermined conditions, such as no generation | occurrence | production of a chemical reaction, for example. Of course, different types of liquid resins can be used. The reason is that the film thickness after spin-off for inner wetting by the first bonding material 1 (for example, rotating for 2.5 seconds at 3000 rpm) is discharged from the nozzle. This is because it is sufficiently thin compared to the thickness at the time of application, and the extent of spread by spin-off after superposition is determined by the viscosity of the second bonding material 2 as a dominant factor.
[0034]
The optical recording medium OD having such a configuration is manufactured by a manufacturing apparatus 10 having a configuration as shown in FIG. 7, for example. The manufacturing apparatus 10 includes a pair of disk supply portions 11a and 11b, a pair of slow current cleaner portions 12a and 12b, a pair of inner peripheral wetting portions 13a and 13b, a pair of first spinner portions 14a and 14b, and a pair. 1st conveyance arm part 15a, 15b, the application | coating part 16, the inversion part 17, the alignment index part 18, the 2nd conveyance arm part 19, a pair of 2nd spinner part 20a, 20b, and the hardening conveyance part 21 A curing unit 22, a take-out unit 23, and a collection unit 24.
[0035]
The first recording substrate Da of the optical recording medium OD is supplied to one disk supply unit 11a, and the second recording substrate Db is supplied to the other disk supply unit 11b. The first recording substrate Da side and the second recording are sequentially transported to the first spinners 14a and 14b through the slow current cleaners 12a and 12b and the inner wetting parts 13a and 13b, respectively. Since the process on the substrate Db side is exactly the same, only the process on the first recording substrate Da side will be described here, and the description of the process on the second recording substrate Db side will be omitted.
[0036]
The disc supply unit 11a is a place where a first recording substrate Da on which fine irregularities are formed as an information recording surface is supplied, and a plurality of recording substrates Da are supported by support pillars inserted through the center holes. Yes. The disk supply unit 11a has a lift-up mechanism 30 composed of a combination of a motor, a ball screw, and a lift-up plate. By rotating the ball screw with the motor and raising or lowering the lift-up plate intermittently, The recording substrate Da can be taken out.
[0037]
The slow current cleaner section 12a is for removing dust adhering to the surface by blowing ionized compressed air to the recording board Da sent from the disk supply section 11a, and for eliminating static electricity from the recording board Da. is there. This slow electric cleaner section 12a collects the spindle 31 on which the recording substrate Da can be placed and rotated by 180 °, the air nozzle 32 that blows out ionized compressed air, and the air blown out from the air nozzle 32 A duct housing 33 is provided.
[0038]
As shown in FIGS. 1A and 1B, the inner wetting portion 13a applies the first bonding material 1 to a predetermined position on the bonding surface of the recording substrate Da sent from the slow current cleaner portion 12a. . The inner peripheral wetting portion 13a includes a table 34 on which the recording substrate Da can be placed and rotated, and a wetting nozzle 35 that discharges the first bonding material 1a to the inner peripheral portion of the recording substrate Da. ing. The wetting nozzle 35 is configured to be movable in the radial direction of the recording substrate Da by a slide mechanism. Through the operation of the slide mechanism, the first laminating material 1a can be arbitrarily moved in the radial direction of the recording substrate Da. It can be applied to the position. Therefore, by performing rotation control of the table 34 and discharge control of the wetting nozzle 35, the first bonding material 1 is continuously provided in the circumferential direction at an arbitrary position on the inner peripheral portion of the bonding surface of the recording substrate Da. It can apply | coat to a ring shape or it can apply | coat intermittently to a ring shape by appropriate length in the circumferential direction.
[0039]
Further, the first spinner portion 14a extends the first bonding material 1 applied by the inner peripheral wetting portion 13a by shaking it off with a centrifugal force, and as shown in FIGS. It is something to spread out. The first spinner portion 14a has a rotary table 36 that sucks and rotates the recording substrate Da at a high speed, and the first bonding material 1 scattered from the outer peripheral edge of the rotating recording substrate Da bounces back to the recording substrate Da. And a rebound prevention plate 37 for preventing adhesion.
[0040]
The first transport arm unit 15a sequentially transports the recording substrate Da from the disk supply unit 11a to the first spinner unit 14a through the slow current cleaner 12a and the inner peripheral wetting unit 13a. The first transfer arm portion 15a includes a comb-like frame 38 that divides the moving direction of the recording substrate Da into three places, and the frame 38 can be moved up and down and linearly reciprocates in the moving direction of the recording substrate Da. A transport driving mechanism to be operated. In each partition portion of the frame body 38, suction portions capable of sucking and transporting the recording substrate Da are provided. The first recording substrate Da supported by the rotary table 36 of the first spinner 14a located at the tip of the first transport arm 15a is pushed by the tip of the frame 38 and transported to the coating unit 16. The
[0041]
This application part 16 applies the 2nd bonding material 2 on the 1st bonding material 1 extended by the 1st spinner part 14a. The coating unit 16 is a predetermined position on the inner peripheral portion of the mating surface of the spindle that is made rotatable by sucking the conveyed first recording substrate Da and the first recording substrate Da held by the spindle. And an application nozzle 40 for applying the second bonding material 2. Then, at the suction position a, the first recording substrate Da is transferred from the first transport arm portion 15a to the coating portion 16. In this suction position a, as shown in FIGS. 3A and 3B, the second bonding material 2 is discharged from the coating nozzle 40, and the second bonding material 2 is ring-mounted on the first bonding material 1. It is applied to the shape.
[0042]
On the other hand, the second recording substrate Db supported by the rotary table 36 of the first spinner portion 14b located at the tip of the first transport arm portion 15b located on the second recording substrate Db side is the frame 38. It is pushed at the tip and conveyed to the reversing unit 17.
[0043]
The reversing unit 17 receives the second recording substrate Db conveyed from the first spinner unit 14b and reverses it 180 °, and cooperates with the next index unit 18 to move the second recording substrate Db. It is superimposed on the first recording substrate Da. The reversing unit 17 includes a reversing drive mechanism for reversing the crank arm 41 by 180 °, a suction plate provided at the tip of the crank arm 41 and capable of sucking the second recording substrate Db, and suction by the suction plate. And a vertical movement mechanism for moving the second recording substrate Db reversed 180 ° by the crank arm 41 in the vertical direction.
[0044]
A matching index portion 18 is provided so as to connect the reversing portion 17 and the coating portion 16. The alignment index unit 18 is for bonding the first recording substrate Da and the second recording substrate Db and transporting them to the next second transport arm unit 19. The alignment index portion 18 includes a rotating arm 42 having three arms arranged at equal intervals of 120 °, a suction portion provided at the tip of each arm and capable of sucking the first recording substrate Da, There is provided an arm rotation mechanism that moves the rotation arm 42 intermittently at an angle of 120 ° to sequentially move the three positions of the suction position a, the alignment position b, and the transfer position c.
[0045]
The arm rotation mechanism of the alignment index portion 18 is configured to rotate clockwise in FIG. 7. First, the first recording substrate Da is adsorbed at the adsorption position a, and then is moved to the alignment position b. Moving. At the alignment position b, only the first recording substrate Da on which the second bonding material 2 is applied on the first bonding material 1 and the first bonding material 1 are caused by the function of the reversing unit 17. As shown in FIG. 5 through the state shown in FIG. 4, the coated second recording substrate Db is overlapped so that the first and second bonding materials 1 and 2 face each other and sandwich them. Is done. Then, the first recording substrate Da and the second recording substrate Db that are moved to the transfer position c and bonded together via the two types of bonding materials 1 and 2 are transferred to the second transfer arm unit 19. .
[0046]
The second transfer arm unit 19 selectively supplies the bonded recording substrates Da and Db sent from the alignment index unit 18 to the two second spinner units 20a and 20b, and each second spinner unit 20a. , 20b, the laminated recording substrates Da, Db are sequentially conveyed to the next curing conveyance unit 21. The second transfer arm unit 19 is provided with a rotating arm 43 in which four arms are provided at equal intervals of 90 °, and is provided at the tip of each arm and can adsorb the bonded recording substrates Da and Db. An adsorption portion and an arm rotation mechanism that reciprocally rotates the rotation arm 43 at an angle of 90 ° are provided.
[0047]
The arm rotation mechanism of the second transfer arm portion 19 is configured to reciprocately rotate the rotation arm 43 by 90 °, and rotates 90 ° clockwise (solid arrow direction) in FIG. Thus, the bonded recording substrates Da and Db received at the transfer position c are conveyed to the swinging position d of one second spinner portion 20a. At this time, the arm located at the swing-off position e of the other second spinner portion 20b moves to the transfer position c and sucks the bonded recording substrates Da and Db sent next.
[0048]
When the arm rotation mechanism rotates 90 ° in the counterclockwise direction (the direction of the broken arrow) opposite to this, the bonded recording substrates Da and Db received at the transfer position c are in the other second spinner portion 20b. It is conveyed to the shaking position e. Then, the arm located at the swing position d of one of the second spinners 20a moves to the transfer position c and sucks the bonded recording substrates Da and Db sent next.
[0049]
The two second spinner portions 20a, 20b cause the centrifugal force to act on the bonding materials 1, 2 interposed between the two recording substrates Da, Db by rotating the bonding recording substrates Da, Db, These bonding materials 1 and 2 are extended outwardly in the radial direction of the recording substrates Da and Db and spread thinly on the bonding surfaces of both recording substrates Da and Db, and the excess bonding materials 1 and 2 are shaken off. is there. The second spinner portions 20a and 20b are composed of a spindle drive mechanism 44 that sucks and rotates the bonded recording substrates Da and Db, and a bonded recording substrate Da and Db that are rotated by the spindle drive mechanism 44. The anti-bounce plate 45 prevents the bonding materials 1 and 2 shaken off by the centrifugal force from the bonding materials 1 and 2 to bond the substrates again to the recording substrates Da and Db, and the shaked bonding materials 1 and 1. And a bonding material collecting mechanism for collecting 2 and returning it to the recycling tank.
[0050]
As shown in FIG. 6, the second bonding material 2 is sandwiched from both sides by the first bonding material 1 as the excess bonding materials 1 and 2 are shaken off by the second spinner portions 20 a and 20 b. The two recording substrates Da and Db are mixed together and bonded as an adhesive, and serve as a separation layer between the two information recording surfaces provided on each recording substrate Da and Db. .
[0051]
The bonded recording substrates Da and Db on which the excess bonding materials 1 and 2 are shaken off by the second spinner portions 20a and 20b are sequentially moved by the 90 ° reciprocating rotation of the rotating arm 43 of the second transport arm portion 19. It is conveyed to the curing conveyance unit 21. That is, when the rotating arm 43 is rotated by 90 ° in the clockwise direction, the bonded recording substrates Da and Db are conveyed from the one second spinner portion 20a to the curing conveying portion 21, and the next rotating arm 43 is counterclockwise. The laminated recording substrates Da and Db are conveyed to the curing conveyance unit 21 from the other second spinner unit 20b by the 90 ° rotation.
[0052]
The curing conveyance unit 21 receives the bonded recording substrates Da and Db conveyed from the second spinner units 20a and 20b and rotates and conveys them at a predetermined interval. The curing transport unit 21 includes a transport table 46 that is rotationally driven at a constant speed, and eight substrate receiving portions 47 that are provided at eight intervals on the outer peripheral side of the transport table 46.
[0053]
The bonded recording substrates Da and Db transported from the second transport arm unit 19 to the curing transport unit 21 are placed on the substrate receiving unit 47 that has moved to the delivery position f that overlaps the rotating arm 43, and here the transport table 46. Then, the carrier table 46 is rotated in the clockwise direction in FIG. 7 and supplied to the curing units 22a and 22b. In the figure, reference numeral 48 denotes a first detection sensor. The first detection sensor 48 detects whether or not the bonded recording substrates Da and Db exist in the substrate receiving portion 47 that has moved to the delivery position f. Is for.
[0054]
The curing units 22a and 22b cure the bonding materials 1 and 2 bonding the two recording substrates Da and Db of the bonding recording substrates Da and Db by irradiation of light (for example, ultraviolet rays), and record both. This is for forming an optical recording medium OD in which the substrates Da and Db are integrally bonded. The curing portions 22a and 22b have an ultraviolet irradiation device 50 in which upper and lower ultraviolet lamps for generating ultraviolet rays are built in, and ultraviolet rays are emitted from both the upper and lower surfaces of the bonded recording substrates Da and Db by arranging the ultraviolet lamps vertically. I try to irradiate. Then, the two curing portions 22a and 22b are arranged in the rotation direction of the transport table 46 so that the ultraviolet rays can be irradiated to the bonding materials 1 and 2 for a long time, so that the bonding materials 1 and 2 are completely cured. It is configured to be performed.
[0055]
The curing portions 22a and 22b have a table cover 51 that covers a substantially quarter portion of the transport table 46. The first curing portion 22a is disposed at the entrance of the table cover 51, and the first curing portion 22a is disposed in the middle. Two hardened portions 22b are provided. In the vicinity of the outlet of the table cover 51, a preliminary curing portion 22c is set.
[0056]
The bonded recording substrates Da and Db having the bonding materials 1 and 2 cured by irradiation of ultraviolet rays in the cured portions 22a and 22b are taken out at the take-out position g reached by the conveyance table 46 being rotated by a predetermined angle. Is taken out from the transfer table 46. A second detection sensor 52 is provided at the take-out position g. The second detection sensor 52 is for detecting whether or not the bonded recording substrates Da and Db are present in the substrate receiving portion 47 that has moved to the take-out position g, and the take-out portion is based on the detection signal. 23 is driven.
[0057]
The take-out part 23 has a suction part that can suck the bonded recording substrates Da and Db on the substrate receiving part 47, a take-out arm 53 that has the suction part at the tip, and a predetermined position in the vertical direction. And an arm drive mechanism that can move a distance and can turn a predetermined angle in the horizontal direction. The laminated recording substrates Da and Db taken out from the curing and conveying unit 21 by the take-out unit 23 are collected by the collecting unit 24 through a surface inspection unit (not shown) for performing a surface inspection of the laminated recording substrates Da and Db. Is done.
[0058]
The collection unit 24 collects the bonded recording substrates Da and Db that have passed the inspection of the surface inspection unit as a finished product of the optical recording medium OD. The collecting unit 24 includes a receiving plate that receives the optical recording medium OD taken out by the taking-out unit 23, and a collecting spindle that accumulates a predetermined number of sheets on the receiving plate.
[0059]
The manufacturing apparatus according to this embodiment has a series of steps as described above, and in particular, by providing the inner wetting parts 13a and 13b and the first spinner parts 14a and 14b, the bonding materials 1 and 2 are provided. It is possible to accurately control the position of the inner peripheral side of the sheet, and to improve the appearance of the appearance by making the amounts of the bonding materials 1 and 2 on the mating surface of the center hole substantially uniform.
[0060]
That is, according to this embodiment, the first bonding material 1 is applied to the bonding surface of the first recording substrate Da and the bonding surface of the second recording substrate Db, which are bonded to each other, by centrifugal force. Since it was extended, the surface of each mating surface could be smoothed with the first bonding material 1. In the next process, the second bonding material 2 is applied in a ring shape on the first bonding material 1 on one of the bonding surfaces, and both the recording materials 1 and 2 are sandwiched. Since the substrates Da and Db are overlapped, the second bonding material 2 can be smoothly spread on the first bonding material 1 and the second bonding material 2 is thinner. Has been expanded.
[0061]
As a result, the spread degree of the second bonding material 2 can be easily predicted, and the second bonding material when the first recording substrate Da and the second recording substrate Db are overlaid. The position of the laminated material 2 toward the inner periphery can be accurately controlled. Therefore, the appearance of the optical recording medium OD as a product is enhanced, and the commercial value can be improved. In addition, when controlling the position of the bonding material 2 toward the inner peripheral side, a special device such as a vacuum device is not required, so that the cost of the product does not increase.
[0062]
8-10 is for demonstrating the other example of the manufacturing method of the optical recording medium of this invention. That is, FIG. 8 shows a second example of the method for manufacturing an optical recording medium of the present invention. Of the two recording substrates Da and Db constituting the optical recording medium OD, only one recording substrate Da is shown. The first bonding material 1 and the second bonding material 2 described above are applied, and neither of the bonding materials 1 and 2 is applied to the other recording substrate Db.
[0063]
FIG. 9 shows a third example of the method for manufacturing an optical recording medium according to the present invention. Of the two recording substrates Da and Db constituting the optical recording medium OD, one recording substrate Da has The first bonding material 1 described above is applied, and the second bonding material 2 is applied to the other recording substrate Db. Furthermore, FIG. 10 shows the 4th example of the manufacturing method of the optical recording medium of this invention, and the 1st bonding material 1 mentioned above on the two recording substrates Da and Db which comprise the optical recording medium OD. And the 2nd bonding material 2 was apply | coated together.
[0064]
Even with the configuration as shown in FIGS. 8 to 10, it is possible to obtain the same effect as in the above-described embodiment, and to set the deviation of the bonding material to the inner peripheral portion substantially uniformly. it can.
[0065]
As described above, the present invention is not limited to the above-described embodiment. For example, in the above-described embodiment, the first and second bonding materials 1 and 2 are ejected from the nozzle onto the mating surface. Although it was set as the structure apply | coated continuously in a ring shape, the other application | coating method which does not depend on a nozzle can be used. For example, the first or second bonding material 1 or 2 is impregnated into a brush, and the bonding material 1 or 2 is applied to the bonding surface of the recording substrate with this brush (brush coating method). A method in which the first or second bonding material 1 or 2 is impregnated and the bonding material 1 or 2 is stamped and applied onto the bonding surface of the recording substrate with this stamp member (stamp type). Various bonding material application methods such as a method (transfer method) in which the first or second bonding material 1 or 2 is transferred and the transfer material is transferred and applied to the bonding surface of the recording substrate with this transfer member. Can be adopted.
[0066]
In the above embodiment, the ring-shaped relief grooves 3 are provided in the inner peripheral portions of the two recording substrates Da and Db as concave portions for preventing the bonding material from protruding from the central hole. As described above, the escape groove 3 may be provided on any one of the recording substrates Da and Db, and the escape groove 3 may be provided intermittently without being continuous in the circumferential direction. A plurality of grooves may be formed close to each other on one recording substrate. Furthermore, the shape of the groove is not limited to a semicircular shape, and can be formed in various shapes such as a quadrangle and a trapezoid. As described above, the present invention can be variously modified without departing from the spirit of the present invention.
[0067]
【The invention's effect】
As explained above, according to the present invention, On at least one of the bonding surfaces of the first recording substrate and the second recording substrate to be bonded to each other A first application step of applying a first bonding material; At least one of the mating surfaces of the first recording substrate and the second recording substrate is radially outward from the first application position of the first bonding material. Second bonding material In a ring Since the first recording substrate and the second recording substrate are bonded through the second coating step of applying and the extending step of extending these bonding materials, the mating surface is obtained by applying the first bonding material. By smoothing the surface of the material to a certain extent and improving the fluidity, the second bonding material is spread and extended by guiding with the first bonding material, so that the bonding material is not displaced toward the inner periphery. It can be made uniform.
[0068]
Therefore, it is possible to easily predict the spread of the bonding material when the first recording substrate and the second recording substrate are overlapped, and to accurately control the position of the bonding material toward the inner peripheral side. be able to. Therefore, the bonding material does not protrude from the central hole of the recording substrate, and the appearance of the optical recording medium as a product can be maintained and the commercial value can be prevented from being lowered. In addition, no special equipment such as a vacuum device is required to control the position of the bonding material toward the inner periphery, eliminating the time required for defoaming and shortening the manufacturing time and increasing the product cost. The effect that it can prevent is acquired.
[Brief description of the drawings]
FIG. 1 is a diagram for explaining a method of manufacturing an optical recording medium according to the present invention. FIG. 1A is a plan view of a state where a first bonding material is applied to a recording substrate constituting an optical recording medium according to the present invention. The figure and the figure B are same longitudinal cross-sectional views.
FIG. 2 is a diagram for explaining a method of manufacturing an optical recording medium according to the present invention. FIG. 2A is a plan view showing a state in which a first bonding material applied to the recording substrate shown in FIG. FIG. B is also a longitudinal sectional view.
3A and 3B are diagrams for explaining a method of manufacturing an optical recording medium according to the present invention. FIG. 3A is a plan view showing a state where a second bonding material is applied to the recording substrate shown in FIG. 2, and FIG. It is a longitudinal cross-sectional view similarly.
FIG. 4 is an explanatory diagram illustrating a state before the second recording substrate shown in FIG. 2 is overlaid on the first recording substrate shown in FIG. 3 for explaining the method of manufacturing the optical recording medium of the present invention. It is.
FIG. 5 is an explanatory diagram illustrating a state in which the two recording substrates illustrated in FIG. 4 are overlaid for explaining the method of manufacturing the optical recording medium of the present invention.
6 is an explanatory diagram illustrating a state in which the two recording substrates illustrated in FIG. 5 have been shaken out, for explaining a method for manufacturing an optical recording medium of the present invention.
FIG. 7 is an explanatory view showing an example of a manufacturing apparatus used for carrying out the method for manufacturing an optical recording medium of the present invention.
FIG. 8 is an explanatory view showing a second example of the method for producing an optical recording medium of the present invention.
FIG. 9 is an explanatory view showing a third example of the method for producing an optical recording medium of the present invention.
FIG. 10 is an explanatory view showing a fourth example of the method for producing an optical recording medium of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 1st bonding material, 2 2nd bonding material, 3 Escape groove (recessed part), 4 Intermediate film, 10 Manufacturing apparatus, 11a, 11b Disk supply part, 12a, 12b Slow current cleaner part, 13a, 13b Peripheral wetting section, 14a, 14b first spinner section, 15a, 15b first transport arm section, 16 coating section, 17 reversing section, 18 alignment index section, 19 second transport arm section, 20a, 20b second spinner section, 21 Curing / conveying section, 22a, 22b curing section, 23 take-out section, 24 collection section, OD optical recording medium, Da first recording substrate, Db second recording substrate

Claims (4)

A liquid laminating material is interposed between the first recording substrate and the second recording substrate which are provided with fine irregularities for information recording and have a center hole serving as a rotation center, and the laminating material is cured to be first. In the manufacturing method of the optical recording medium formed by bonding the recording substrate and the second recording substrate together,
A first application step of applying a liquid first bonding material to at least one of the bonding surfaces of the first recording substrate and the second recording substrate bonded together;
A second bonding material is annularly formed radially outward from the first application position of the first bonding material applied to at least one of the mating surfaces of the first recording substrate and the second recording substrate. A second application step of applying;
The first bonding substrate and the second recording substrate are overlapped with the first bonding material and the second bonding material to overlap the first bonding substrate between the first recording substrate and the second recording substrate. A method for producing an optical recording medium, comprising: an extending step of extending a bonding material and a second bonding material. In the manufacturing method of the optical recording medium of Claim 1,
At least one of the first recording substrate and the second recording substrate, on the non-information recording surface of the inner peripheral portion near the center hole, the first bonding material and the second bonding material are in the center. A method for manufacturing an optical recording medium, comprising: a concave portion that prevents protrusion from a hole. A first disk supply unit;
A first static elimination cleaner portion to which a first recording substrate is supplied from the first disk supply portion;
A first recording substrate that has been neutralized from the first neutralization cleaner, and a first inner wetting portion that annularly applies a first bonding material to the neutralized first recording substrate;
A first spinner for extending the first bonding material applied by rotating the first recording substrate to which the first bonding material is applied;
An application unit for applying a second bonding material in a ring shape on the first bonding material of the first recording substrate supplied from the first spinner unit;
A second disk supply unit;
A second static elimination cleaner portion to which a second recording substrate is supplied from the second disc supply portion;
A second inner peripheral wetting portion that is supplied with the second recording substrate that has been neutralized from the second neutralization cleaner, and that applies the first bonding material to the second recording substrate that has been neutralized;
A second spinner for extending the first bonding material applied by rotating the second recording substrate to which the first bonding material is applied;
A reversing unit for reversing the second recording substrate from which the first bonding material from the second spinner unit is extended by 180 °;
An index portion for bonding the first recording substrate on which the first bonding material is extended and the inverted second recording substrate;
A third spinner for extending the second bonding material radially outward by rotating the bonded first and second recording substrates;
An apparatus for manufacturing an optical recording medium, comprising: In the manufacturing apparatus of the optical recording medium according to claim 3,
The first and second bonding materials are made of a photo-curing resin, and light is applied to the photo-curing resins of the first and second recording substrates bonded in the index portion to form both recording substrates. An apparatus for producing an optical recording medium, comprising: a curing unit that is integrally joined.

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