JP2001192859A - Lithographic mold - Google Patents

Abstract

(57) [Problem] To provide a durable mold while preventing the lens and the mold from being rounded by the stress of the mold in lens molding using a UV resin. In a lithographic die formed by forming a cutting plating layer on a roll having peelability, cutting the cutting plating layer with a lathe, and then peeling the cutting plating layer, the cutting plating layer is formed. A lithographic die characterized in that a surface to be cut is subjected to a surface treatment after being peeled off from a roll, and a non-cut surface is lined with a rigid plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal mold suitable for a sheet-shaped optical component such as a three-dimensional display lens and a lenticular screen having fine irregularities.

[0002]

2. Description of the Related Art A mold for producing a lens used for a three-dimensional display device or the like is formed by forming a plating layer having excellent machinability on a roll on which a release layer is formed, and forming a required concave portion on the plating layer with a lathe. After cutting, the plating layer is peeled off to make a flat surface and a mold is obtained. Then, a thermosetting resin was applied to the mold, and a heating / pressing / cooling cycle was repeated to produce a lens. However, when this mold is used for molding using a UV resin having a short tact time, the mold becomes round while flowing on a belt conveyor in an exposure machine,
I couldn't make the lens well. In addition, the plated metal used for the cut mold is often copper or copper alloy, which has good machinability and is inexpensive. In this case, the surface corrodes during use, and there is a problem with the durability of the mold. was there.

[0003]

DISCLOSURE OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide a lens and a mold for molding a lens using a UV resin. An object of the present invention is to provide a mold that is prevented from being rounded by the stress of the mold and that is durable.

[0004]

According to the present invention, in order to solve the above-mentioned problems, a cutting plating layer is formed on a roll having releasability, and the cutting plating layer is formed on a lathe. After cutting, in a lithographic die made by peeling the plating layer for cutting, surface treatment is performed on the cutting surface after peeling the plating layer for cutting from the roll, and a non-cut surface is lined with a rigid plate. This is a featured lithographic mold.

[0005] In a second aspect of the present invention, the lithographic die is characterized in that the surface treatment performed on the plating layer for cutting is nickel plating or chromium plating.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below. First, the roll on which the release layer is formed is plated for cutting, the roll is set on a lathe, and cut to a predetermined pitch and depth using a diamond tool. Mold.

Here, any method can be used to impart releasability to the roll, as long as it is commonly used, and a silver layer formed by ballad plating is typically used as the release layer. When a stainless steel tube is used as the core cylinder, the surface of the stainless steel tube itself has peelability.
Regarding the plating for cutting, copper plating with good machinability and low cost is usually performed, but various copper alloys and electroless nickel plating can be used as the plating for cutting. The plating thickness for cutting is 0.3 to 1.0 mm.

Next, the lithographic mold separated from the roll is subjected to a surface treatment, and a rigid plate is lined with a double-sided pressure-sensitive adhesive sheet or an adhesive such as an epoxy-based adhesive to obtain a final plate as shown in FIG. A perfect lithographic mold can be made.

The surface treatment is performed for the purpose of improving the durability of the mold when producing a resin lens. Nickel plating using a Watt bath or chrome plating using a Sargent bath or the like is performed. Etc. can be used. The plating thickness is preferably 1 to 3 μm. The backing plate only needs to have mechanical strength. For example, a metal plate such as an aluminum alloy or a copper alloy, or a resin plate can be used. As the resin plate, any of an epoxy resin plate, a phenol resin plate, and a melamine resin plate can be used.

[0010]

Example: Nickel plating was applied to the surface, and the pitch was 100
An example in which a lithographic die for producing a lenticular member of up to 500 μm is produced.

A release layer is formed by a ballad plating method using a step of forming a cylinder for gravure printing, and a copper plating film having a thickness of 800 μm is cut at a bath temperature of 42 ° C.
The film was formed under the conditions of a deposition rate of 15 to 23 A / dm ² . The roll is set on an NC lathe and a diamond tool is used at a cutting speed of 100 to 200 m / min and a pitch of 100 m / min.
A reverse uneven pattern of a lenticular of 500 μm was cut. Thereafter, a groove for peeling was cut on the surface using a carbide tool, peeled off from the roll, and cut into a predetermined size by a cutting machine to produce a lithographic mold.

As this surface treatment, nickel plating is applied for about 1 hour.
Performed with a thickness of 3 μm. Nickel sulfamate 30
0 to 450 g / L, boric acid 30 to 40 g / L, nickel chloride 10 to 20 g / L, suitable amount of brightener, pH 4.0 to 4.5
Electrolytic nickel plating was performed using a nickel plating bath having the following composition. After plating, they were washed with water, hot water, and dried.

Next, a double-sided pressure-sensitive adhesive sheet serving as a pressure-sensitive adhesive layer is adhered to the surface of the aluminum alloy plate, and a lithographic mold is placed thereon. Produced. The lithographic mold was coated with UV resin to produce a lenticular lens. As a result, a good lens could be produced without rounding the lens and the mold. Also, the durability of the mold was improved.

[0014]

By using the flat mold of the present invention,
In the process of manufacturing a lens for a three-dimensional image, a lenticular screen lens or the like using a UV resin having a short tact time, a good lens can be manufactured without a round mold. In addition, the durability of the mold is increased, so that the lens can be efficiently and inexpensively provided.

[0015]

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a flat mold according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Surface treatment Nickel plating or chrome plating 2 ... Cutting lithographic mold 3 ... Adhesive layer 4 ... Rigid plate

Claims (2)

[Claims] 1. A lithographic mold formed by forming a plating layer for cutting on a roll having releasability, cutting the plating layer for cutting with a lathe, and peeling the plating layer for cutting, wherein the plating layer for cutting is formed. A flat plate mold characterized in that a surface of a cut surface is subjected to surface treatment after peeling off from a roll, and a non-cut surface is lined with a rigid plate. 2. A planographic mold wherein the surface treatment performed on the plating layer for cutting is nickel plating or chromium plating.