TW561089B - Method for manufacturing mold inserts of light guide plates - Google Patents

Abstract

Disclosed is method for manufacturing mold inserts of light guide plates, which employs mechanical machining or laser machining to performing point machining operation on a machining surface of a substrate, so as to form a lumpy surface having plural dimples on the machining surface of the substrate. The substrate after machining is placed in a polishing tank for electrolysis or chemical polishing. Course protrusions projecting beyond the dimples on the substrate are subjected to a greater extent of etching to form smooth and fine surfaces. The substrate after polishing is placed in a nickel-plating tank, to deposit a nickel layer on the lumpy surface and the dimples by means of oxidation reduction, whereby the surfaces of the nickel layer forms a micro-structural face identical to the lumpy surface. The substrate plated with a nickel layer thereon may serve as a mold insert for light guide plates.

Description

561089 V. Description of the invention (1) [Technical field] The present invention relates to a method for manufacturing a light guide plate mold core, which first performs a dot processing on the substrate, and then performs a polishing step and a nickel plating step to make the surface of the substrate Manufacturing method of light guide plate mold core for depositing smooth and fine recording layer. [Previous technology] Please refer to FIG. 3A, which is a schematic diagram of a conventional mold core microstructure forming method, which uses a predetermined shape of a tool 8 1 on a substrate 8 2 surface processing to make the substrate 8 2 A concave portion 8 2 1 having a plurality of microstructures is formed on the surface as a mold core.

However, please refer to FIG. 3B, which is a partially enlarged schematic diagram of the microstructure concave portion 8 2 1. Because the microstructure concave portion 8 2 1 is formed by direct engraving with the tool 8 1, the micro structure concave portion 8 2 1 is caused by the tool 8 1 the shape of the cutting end, there will be many sawtooth-like unevenness marks S in the passing area, and it is difficult to form a smooth and flat surface, which affects the direction after light reflection. In addition, the tool 8 1 is to be able to process fine structures Graphics, so the size of the tool 8 1 itself is usually small (this kind of tool is usually a micro drill), and in order to make the tool 8 1 easy to process, the hardness of the surface of the substrate 8 2 should not be too high, but also because of the substrate 8 2 The surface hardness is low, so when the substrate 8 2 is put into the mold as the mold kernel, the plastic is injected into the mold by high pressure, so that the surface of the substrate 8 2 is easily affected by the impact and friction of the plastic. The mold kernel itself As a result, the accuracy is also reduced, which relatively affects the surface microstructure of the light guide plate formed after the plastic is formed. However, if the hardness of the surface of the substrate is increased, it will be difficult to process, and the knife

561089 V. Description of the invention (2) It has the disadvantage of easy loss. Therefore, in order to overcome the problem of traditional processing methods for high-hardness substrates, a method for manufacturing light guide plate molds using a yellow light process has been derived. Please refer to FIG. 4, which is a layer of light coated on a substrate 91. After the resist layer 92, the photoresist layer 92 is selectively exposed, so that the photoresist layer forms a plurality of exposed portions 9 2 1 and unexposed portions 9 2 2. The exposed substrate 9 1 is immersed in a developing solution 9 4 so that the unexposed portion 9 2 2 (or the exposed portion 9 2 1) is etched away, and then the substrate 9 1 is taken out of the developing solution. Heat treatment is performed to soften the top of the exposed portion 9 2 1 (or the unexposed portion 9 2 2), and respectively form a deformed structure 9 2 3 that is approximately circular and uniformly symmetrical. After plating a metal layer 9 3 on the top surface of the photoresist layer 9 2, the substrate 9 1 is separated from the metal layer 9 3, and the bottom surface of the metal layer 9 3 forms a plurality of microstructures complementary to the deformed structure 9 2 3. 1 . Although the yellow light process can produce more precise mold kernels, it is more cumbersome due to the multiple complicated procedures such as exposure, development, and plating, and it takes a long processing time, and the equipment is expensive and uneconomical. benefit. [Objective and Effect] The main purpose of the present invention is to solve the above-mentioned problems and provide a method for manufacturing a light guide plate mold kernel, which first performs dot processing on a substrate, and then smoothes the surface of the substrate by polishing. The manufactured mold core is used to make the surface of the light guide plate generated after the mold turn smooth, so as to improve the light guide effect; and the method of the present invention is used to simplify the manufacture of the light guide plate mold core.

561089 V. Description of the invention (3) Manufacturing process and shortening manufacturing time, and improving economic benefits. A second object of the present invention is to provide a method for manufacturing a light guide plate mold core, which first uses a lower hardness alloy as a substrate, and after a substrate is processed with a cutter, a recording layer is formed on the surface of the substrate. A mold kernel is made to increase the hardness of the surface of the mold kernel and extend the service life, and at the same time, to avoid the loss of the tool. [Technical content] The present invention provides a method for manufacturing a light guide plate mold core, which includes the following steps and dot processing steps: processing a processing surface of a substrate with a processing tool, so that the processing surface of the substrate has a plurality of depressions. The concave and convex surface of the cavity, and the inner surface of the cavity produces rough irregularities and rough depressions with irregular irregularities after processing; polishing step: the processed substrate is placed in a polishing bath, and the polishing bath is placed in the polishing bath There is a polishing liquid, which causes the rough convex part protruding more prominently in the cavity of the substrate to be etched to a large extent, and the rough concave part is engraved by a small amount of money because it is in a concave state. Equally etch to form a smooth and fine surface of the cavity of the substrate; the step of nickel plating layer places the polished substrate in a nickel plating bath, and oxidizes and reduces the uneven surface of the substrate and A nickel layer is deposited on the plurality of recesses, and the surface of the nickel layer is formed with the same microstructure surface as the uneven surface of the substrate, so that the substrate having the metal nickel layer on the surface can become the mold core of the light guide plate. ≫ The above and other objects and advantages of the present invention, chosen from the following difficult

561089 V. Description of the invention (4) Detailed descriptions of the embodiments and the drawings ′ gain in-depth understanding. Of course, the present invention allows some differences in the arrangement or arrangement of other parts, but the selected embodiment is described in detail in this specification and its structure is shown in the drawings. [Detailed description of the embodiment] Please refer to FIG. 1 and FIG. 2. The structure shown in the figure is the structure of the first embodiment selected by the present invention. This is for illustrative purposes only, and is not subject to this in patent applications. Structural restrictions. The invention relates to a method for manufacturing a light guide plate mold core, which comprises the following steps: a dot processing step: engraving a processing surface 12 of a substrate 1 with a tungsten carbide tool 6; in the present embodiment, the substrate Material 1 is made of corrugated copper alloy (its hardness is HRC 2! 0). The cutter 6 is a micro-shaped drill. The cutting feed end of the cutter 6 has a cutting end 6 1 with a tapered surface. , The cutting end 6 1 has a cutting edge angle 6 1 1, the missing angle of the cutting edge angle 6 1 1 is ninety degrees, and the rotation speed of the tool 6 is set to 3 0 0 0 0 rp in (rev / min), and The time of each contact between the tool 6 and the substrate 1 is 0 · 1 second, and the single feed depth is 10 to 70 um; the cutting end 6 1 of the tool 6 touches the processing surface 1 2 of the substrate 1, The processing surface 1 2 is formed into a concave-convex surface 1 1 having a plurality of recesses 1 1 1. The inner diameter of the plurality of recesses 1 1 1 is larger than the outer diameter of the tool 6 and the depth is 10 to 7 0 um. Due to the relationship between the engraving of the cutter 6 and the cutting edge angle of the cutter 6 1 1 on the inner surface of the recess 1 1 1, there are many irregular convex rough projections 1 1 2 and rough recesses 1 1 3.

Page 7 561089 V. Description of the invention (5) Polishing step: This embodiment is an example of electrolytic polishing. The substrate 1 of the beryllium copper alloy is placed in an electrolytic polishing tank A, and the electrolytic polishing tank A is placed. An acid-filled aqueous solution 3 2 (the volume ratio of the acid-filled aqueous solution (Η 3 PO 3) to the water is 7 2: 2 8), and the phosphoric acid aqueous solution 3 2 is juxtaposed with a copper sheet 31. The sheet 31 is used as the cathode, and the substrate 1 is used as the anode. The copper sheet 3 1 is connected to the negative current, and the substrate 1 is connected to the positive current ^, and a current density of 6 is applied at room temperature (2 5 C). ~ 8 ASD, electrolytic polishing for 3 minutes. Please refer to Figure 2. When the electrolytic polishing is performed, the rough convex portion 1 1 2 which is more convex in the cavity 1 1 1 is more likely to be etched due to the effect of tip discharge. Since the rough concave portion 1 1 3 is in a concave state, it is not easy to be etched to a large extent, so that the unevenness 1 1 1 of the base material 1 can gradually form a smooth and fine surface under uneven etching. Step of nickel plating: The substrate 1 of the beryllium copper alloy after polishing is placed in another key recording tank B, and a recording and filling solution 2 is placed in the nickel nickel tank B. The nickel-phosphorus solution 2 is added. A nickel layer 1 is deposited on the embossed surface 1 1 of the substrate 1 and the majority of the recesses 1 1 1 by a redox method at a temperature of 80 to 9 0 ° C and a ρ Η value of 4.5. 3, the thickness of the nickel layer 13 is 5 um, and the hardness of the recording layer 13 is HRC 4 5. The surface of the nickel layer 13 is formed into a microstructure with the same shape as the uneven surface 11 of the substrate 1. Surface 1 4 and make the base material 1 of the beryllium copper with the recording layer 1 3 become a mold core 4 ◦ through the recording layer 13 to increase the hardness of the surface of the substrate 1 and extend the service life of the substrate 1, In order to avoid the situation of conventional technology because of the lower hardness of the mold kernel, the limited life span occurs.

561089 V. Description of the invention (6) In addition, the polishing step can also be treated by chemical polishing with a solution such as nitric acid, sulfuric acid, hydrochloric acid, phosphoric acid, etc., regardless of electrolytic or chemical polishing technology. This is not a technical feature of the present invention and will not be described in detail herein. It can be known from the above description that the present invention enables the surface of the microstructure surface 14 of the mold core 4 to be polished by performing a polishing step on the substrate 1 after engraving the substrate 1 with the cutter 6 and then plating a nickel layer 1 3. Smooth and maintain a predetermined hardness, so that the microstructure of the light guide plate generated after the mold turning has a smooth light guide surface, thereby improving the light guide effect. Furthermore, in the method of the present invention, as long as the substrate 1 is processed, the polishing process is performed to make the surface smooth, and the processing steps of plating the recording layer 13 are performed to obtain the mold core 4. Because the present invention maintains the fast cutting characteristics of the traditional mechanical processing method, the present invention can greatly simplify the manufacturing process and shorten the manufacturing time, and improve economic benefits, compared with the traditional yellow light process processing method; and further eliminate the traditional The mechanical processing method cannot overcome the problem of smooth surface of the microstructure surface, so that the light guide efficiency of the light guide plate made of the mold core 4 of the present invention is improved. To sum up, the dot processing of the present invention can be processed on the substrate by means of cutter processing or laser processing, so that the surface of the substrate is formed with an uneven surface, and then polished to make the surface of the microstructure surface smooth and fine. Improve the light guide effect, and make the manufacture of the light guide plate mold kernel more convenient, which is in line with economic benefits. The disclosure of the embodiments described above is used to illustrate the present invention, and is not intended to limit the present invention. Therefore, any change in numerical values or replacement of equivalent components should still be subject to

561089 V. Description of the invention (7) belongs to the scope of the present invention. From the above detailed description, those skilled in the art can understand that the present invention can indeed achieve the aforementioned purpose, and has indeed complied with the provisions of the Patent Law, and filed a patent application.

Page 10561089 Brief description of the diagram. Figure 1 is a schematic flow chart of the manufacturing method of the light guide mold core of the present invention. Figure 2 is an enlarged schematic view of the concave-convex surface of the substrate of the present invention being cut by a tool. Schematic diagram of the method. Figure 3B shows the case where jagged marks are also generated on the surface of the conventional mold core. Figure 4 is a schematic flow chart of another method for manufacturing a conventional light guide plate mold. [Illustration of the number] (conventional part) Tool 8 1 Substrate 8 2 Microstructured surface 8 2 1 Substrate 9 1 Photoresist layer 9 2 Exposed portion 9 2 1 Unexposed portion 9 2 2 Deformed structure 9 2 3 Metal layer 9 3 Microstructure 9 3 1 Developer 9 4 (Part of the invention ) Substrate 1 Convex surface 11 Cavity 111 Rough convex part 1 1 2 Rough concave part 1 1 3

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Claims (1)

561089 VI. Application for Patent Scope 1. A method for manufacturing light guide plate mold kernels, including the following steps: · Dot processing step: processing a processing surface of a substrate with a processing tool, so that the processing surface of the substrate forms a Concave and convex surface of most pits, and the inner surface of the pits produces rough irregularities and rough dents with irregular irregularities after processing; Polishing step: The processed substrate is placed in a polishing bath, and a polishing liquid is placed in the polishing bath, so that the polishing liquid produces rough protrusions that protrude from the recesses of the substrate. It is etched to a certain extent, and because the rough concave portion is in a concave state, it is etched in a small amount, which is considered to be uneven etching, so that the recesses of the substrate form a smooth and fine surface nickel plating step. Step: Place the polished substrate separately. In a nickel plating bath, a nickel layer is deposited on the uneven surface of the substrate and the majority of the recesses in a redox manner, and the surface of the recording layer is formed to have the same micro-scale as the uneven surface of the substrate. Structural surface, so that the substrate with metal recording layer on its surface can become the mold core of the light guide plate. 2. Manufacturing method of the light guide plate mold core as described in item 1 of the scope of patent application Wherein, the processing tool of the dot processing step is a tool of a tungsten carbide micro drill, the cutting feed end of the tool has a cutting end having a tapered surface, the cutting end has a cutting edge angle, and the cutting edge angle The included angle is ninety degrees, and the rotation speed of the tool is set to 3000 rpm (revolutions per minute), and the time between each contact between the tool and the substrate is 0.1 second, and the single feed depth is 10 ~ 7 0 um. 3. Manufacturing method of the light guide plate mold core according to item 1 of the scope of patent application Page 13 561089 6. The scope of the patent application, wherein the nickel plating step is to place the substrate in a nickel-based alloy solution to perform electroless nickel treatment, so that the surface of the substrate is formed into the metallic nickel through a redox reaction. Layer, the texture of the surface of the metal recording layer corresponding to the microstructure surface also forms a surface having the same microstructure. 4. The manufacturing method of the light guide plate mold kernel according to item 1 of the scope of the patent application, wherein the polishing step is one of electrolytic polishing to which electric current is applied and chemical polishing to which electric current is not applied. 5. The manufacturing method of the light guide plate mold kernel according to item 4 of the scope of the patent application, wherein 'the polishing liquid of the electrolytic polishing is an acid-filled aqueous solution', and a copper sheet is juxtaposed in the aqueous solution of hydration, and the copper sheet is used as The cathode is used as the anode, and the copper sheet is turned on to the negative current, and the substrate is turned on to the positive current, and a current density of 6 to 8 Λ SD is applied at room temperature for electrolytic polishing. Page 14