JPH0716956B2 - Resin disk manufacturing method - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a method for producing a resin disk such as an optical disc or a flat plate type lens, and particularly to inject the resin onto a mold and press the resin with a pressing plate to make the resin uniform. The present invention relates to a manufacturing method having a characteristic in a mounting process of a mold used in a manufacturing method of expanding the structure into a sheet.

[Prior art and its problems]

(Prior Art) In an optical disk, a flat lens, or the like, it is necessary to transfer a fine concavo-convex pattern to at least one surface of a resin disk. A method using an injection molding machine for manufacturing such a fine resin disk and a method for manufacturing by uniformly spreading the resin on a mold have been proposed. The latter method is disclosed in
As shown in No. 53-116105, the resin 3 is poured onto the mold 2 held by the mold base 1 shown in FIG. 3, and the circular substrate 4 is held so as to be curved from the upper part. A method is known in which the resin is pressed to spread the resin evenly and transferred and cut. In addition, as shown in JP-A-55-152028,
A method has been proposed in which the resin 7 is injected from below the mold 6 held on the mold base 5 shown in the figure and pressed by the substrate 8 and the pressing plate 9 to form a resin disk.

(Problems to be Solved by the Invention) However, in the manufacturing method shown in FIG. 3, since the substrate 4 is fixed by the number of points, the position of the substrate easily shifts during repeated pressing, and the substrate 4 is placed on the mold 2. It was difficult to press them in parallel. Further, in the method shown in FIG. 4, the mold 6 is worn out during repeated molding, and therefore needs to be replaced, but the replacement mechanism of the mold becomes complicated. Further, it is possible to fix the mold by vacuum suction in order to facilitate the replacement of the mold, but there is a problem that the resin may be sucked from the suction part.

[Object of the Invention]

The present invention has been made in view of such a conventional manufacturing method, particularly a problem at the time of mounting the mold, and the mold can be mounted parallel to the substrate when pressing the mold at the time of molding. This is a technical issue.

[Constitution and effect of the invention]

(Means for Solving the Problems) The present invention is a method for manufacturing a resin disk in which a predetermined pattern is formed on a substrate. As shown in FIG. 1, a die having a predetermined pattern on the upper surface is held. A step of applying an adhesive agent on the die stand, a step of adhering the die by pressing the die on the die stand by a pressing plate provided on the top of the die stand and moving up and down, Injection process of injecting resin into the mold fixed on the table, pressing the resin injected by the pressing plate through the substrate having the same shape as the mold, and curing to cure the pressed resin And a process.

(Operation) According to the present invention having such a feature, the adhesive is applied onto the mold base, and the mold having the predetermined fine pattern is pressed by the pressing plate to be bonded. Resin is injected into the upper surface of the mold fixed in this way, and the above-mentioned pressing plate is used to press the resin from above the resin through the substrate to manufacture a resin disk.

(Effect of the invention) Therefore, according to the present invention, since the same pressing plate is used for pressing the substrate and pressing the mold on the mold base, the mold is parallel to the pressing plate and the substrate. Therefore, the film thickness of the resin can be made uniform, and a highly accurate resin disk can be constructed. Further, even when the die is replaced due to wear or damage, the die can be fixed on the die stand so as to be parallel to the substrate by the same method.

[Explanation of Examples]

FIG. 2 is a side view of an apparatus used for manufacturing a resin disk according to an embodiment of the present invention. Device main body as shown in this figure
A mold base 12 for fixing the mold is fixed to 11 with bolts or the like. Then, the L-shaped cylinder fixing portion 13 is vertically attached to the apparatus main body 11, the cylinder 14 is opposed to the mold base 12 as shown in the drawing, and the tip of the cylinder 14 is held substantially parallel to the mold base 12. Install board 15. The cylinder 14 moves the pressing plate 15 up and down based on a signal from the outside.

When manufacturing the resin disk in this embodiment, the mold is first mounted on the mold base 12. In this case, as shown in FIG. 1 (a), the adhesive 16 is applied on the die stand 12 with a uniform thickness. And a die 17 having an uneven pattern on the upper surface thereof
Then, as shown in FIG. 1 (b), the cylinder 17 is driven to press the die 17 using the pressing plate 15. Then, the adhesive 16 is cured by holding this state for a long time. By doing so, a high degree of parallelism can be obtained between the pressing plate 15 and the mold 17 regardless of the accuracy of the parts of the device.

Now, when manufacturing the board, as shown in Fig. 1 (c), the mold stand
Resin 1 on mold 17 mounted by adhesive 16 on 12
8. For example, an ultraviolet curable resin is applied uniformly. Then, as shown in FIG. 1 (d), the transparent substrate 19 is pressed from above by the cylinder 14 using the same pressing plate 15 as when the mold 17 is fixed. Then, the resin 18 is spread by the pressing plate 15 and the transparent substrate 19, and the resin disk is formed by pressing the resin 18 to a required film thickness. Then first
As shown in FIG. 3E, ultraviolet rays are radiated from the upper surface of the transparent substrate 19 using an ultraviolet light source 20 to cure the resin. Then, a resin having a shape corresponding to the unevenness of the mold can be obtained. Then, as shown in FIG. 1 (f), the cured resin 18 is separated from the mold 17 together with the transparent substrate 19 to obtain a resin disk.
In this way, since the mold 17 and the pressing plate 15 have the same parallelism, if the transparent substrate 19 is pressed using the same pressing plate, the mold 17 is also in parallel, and a resin plate having a high parallelism is manufactured. can do.

Although an ultraviolet curable resin is used as the resin in this embodiment, it goes without saying that the same effect can be obtained by using an electron beam curable resin and irradiating the electron beam from the upper surface of the substrate.

[Brief description of drawings]

FIG. 1 is a diagram showing a manufacturing process of a resin disc according to an embodiment of the present invention, FIG. 2 is a perspective view showing a resin disc manufacturing apparatus according to this embodiment, and FIG. 3 is a diagram showing a conventional resin disc. FIG. 4 is a sectional view showing another conventional manufacturing apparatus. 11 …… Device body, 12 …… Mold base, 14 …… Cylinder, 15…
… Pressing plate, 16 …… Adhesive, 17 …… Mold, 18 …… Resin,
19 ... Transparent substrate

Claims (2)

[Claims] 1. A method of manufacturing a resin disk for forming a predetermined pattern on a substrate, comprising: an applying step of applying an adhesive agent onto a mold table holding a mold having a predetermined pattern on its upper surface; Adhesion step of pressing and adhering the mold onto the mold base by a pressing plate provided on the top of the mold base and moving up and down, and injecting resin into the mold fixed on the mold base A resin having a step, a step of pressing the resin injected by the pressing plate through a substrate having the same shape as a mold, and a curing step of curing the pressed resin. Disk manufacturing method. 2. The resin is an ultraviolet curable resin, the substrate is a transparent substrate, and the curing step is a step of curing the resin by irradiating ultraviolet light from the upper surface of the substrate. A method for producing a resin disk according to claim 1.