JPH01168412A - Molding die for resin lens - Google Patents

Abstract

PURPOSE:To prevent the deterioration in a die caused by sliding or the like by keep the outer diameter of a die outer peripheral surface in a portion worked in a small size prior to applying a metal plating material on an optical lens surface and a die outer periphery, and making the die outer peripheral surface into a sliding surface in finishing the outer peripheral surface up to the final dimension after applying a metal plating. CONSTITUTION:The outer diameter D1 in a portion of a die outer peripheral surface A connected to an optical surface C of the die 1 is worked previously smaller than the final finishing dimension D2 by phi0.02-phi0.14mm. An edge portion, wherein the die outer peripheral surface A and the optical lens surface C are in contact with each other, is work with a minute chamfer by r0.1-0.3mm or c0.2-0.6mm. The die 1 is used with a stainless steel as a raw material and made with a hardness of HRC52-55 by quenching and annealing. After applying the metal plating 2 in the thickness of 0.05-0.12mm on the die outer peripheral surface A and the optical lens surface C, the optical lens surface C is finished as desired shape and the die outer peripheral surface A and the metal plating material peripheral surface B are finished to a final finishing dimension D2, so that the die outer peripheral surface A is made into a sliding surface and the edge portion after applying a metal plating material is sharpened.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a mold for molding a resin lens whose optical surface is plated, and is suitable for preventing deterioration of mold life due to sliding etc. It is related to molds.

[Conventional technology]

There is an increasing need for molds for resin lenses, which are optical components, to have higher precision and shorter delivery times. It is described on pages 558 to 558. That is, as shown in FIG. 5, a mold 1 made of ferrous material such as stainless steel
A part of the outer peripheral surface A of the mold and the optical surface C are coated with a plating material 2 such as electroless N1 plating, and the structure is such that it can be cut with a diamond cutting tool, which is highly effective in terms of processing accuracy and delivery time. .

However, no consideration was given to the reduction in life due to scratches or the like on the outer peripheral surface B of the plated material where the mold 1 slides on the frame (not shown) during the molding stage.

[Problem that the invention seeks to solve]

An object of the present invention is to improve the life of the mold, which is the main consideration of the above-mentioned prior art.

[Means for solving problems]

The above purpose is to reduce the outer diameter of some of the mold outer peripheral surfaces to φ0.0 before applying the plating material to the optical lens surface and the mold outer peripheral surface.
This is achieved by machining the mold to a size of 2 to 0.14 mm, and then plating the outer diameter of the outer circumferential surface to the final dimension, thereby making the outer circumferential surface of the mold a sliding surface.

[Effect]

The mold 1 built into the frame operates with the mold outer circumference used as a sliding surface during molding. When the top of the mold is hardened, HRC52
Since the hardness is ~55, the occurrence of scratches due to sliding is reduced.

〔Example〕

Embodiment 1 An embodiment of the present invention will be described below with reference to FIGS. This will be explained with reference to Figure 3.

FIG. 1 is a schematic diagram of a mold for resin lenses;
The figure and FIG. 3 are detailed views of the etched portion E in FIG. 1.

In FIG. 1, a mold 1 has a mold outer circumferential surface A and an optical lens surface C that is symmetrical about the rotational axis in a part thereof, and the optical surface C
The outer diameter D1 of the part of the mold outer circumferential figure connected to the mold is pre-processed to be smaller than the final finished dimension D2 by φ0.02 to φα14 (that is, D+-D2 (φ0.02 to φα16)). Further, the edge portion where the mold outer circumferential surface A and the optical lens surface C are in contact is subjected to micro-chamfering with r 0.1 to 0.5 wm or c Q, 2 to 0.6 era (Fig. 2). and Figure 5).

The mold 1 is preferably made of stainless steel and hardened to a hardness of HRC 52 to 55 by quenching and tempering.

[105
The plating material 2 with a thickness of ~0.12 m is applied, and then the optical lens surface C is finished into the desired shape, and the mold outer circumferential surface A and the plating material outer circumferential surface Bt - final finished dimension D
2, the outer peripheral surface A of the mold can be used as a sliding surface, and the edge portion after plating can be sharpened.

In addition, the plating material 2 is electroless N1 plating considering that it can be cut with a diamond cutting tool, and HHC49~
A hardness of 50 is desirable.

As explained above, according to this embodiment, since the sliding surface with the frame is the outer circumferential surface of the mold, it is possible to reduce the occurrence of scratches due to sliding, etc., and there is an effect that the life of the mold can be improved. Furthermore, the edges of the mold are slightly chamfered to strengthen the plating material.
It has the effect of making 11 lines.

Example 2 Another embodiment of the present invention will be described with reference to FIG.

In Example (1), an example was shown in which the outer circumferential surface B of the plated material was set to the final finished dimension D2, but in this embodiment, the outer diameter D (of the outer circumferential surface B of the plated material is It is characterized by being smaller than the mold outer circumferential surface A, that is, the eg finished dimension D2.

Note that if the outer diameter D of the outer peripheral surface of the plated material is extremely small, it will cause cracks in the molded product, so it is desirable to set it to a value smaller than the final finished dimension D2 by 0.01 to 0.04 mm.

According to this embodiment, since the sliding surface with the frame is only the outer peripheral surface of the mold, there is an effect that the life of the mold can be further improved than in Example (1).

〔Effect of the invention〕

According to the present invention, by making the sliding surface with the frame the outer peripheral surface of the mold, it is possible to reduce the occurrence of scratches and peeling of plating, thereby improving the life of the mold. There is a wave-level effect of unit price reduction.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of a mold for a resin lens according to an embodiment of the present invention, FIGS. 2 and 3 are enlarged views of section E in FIG. 1, and FIG. 4 is another embodiment of the present invention. A sectional view of an example molding die for a resin lens. FIG. 5 is a schematic sectional view of a molding die for a resin lens in the prior art. 1... Mold, 2... Plating material, A...
・Outer peripheral surface of the mold, B...Outer peripheral surface of the plating material, C...
・Optical lens surface. Fan 1 Figure 1: Gold ￥ 8: Me 1-4 I outer lunar surface 2;
Metal Tsuki + i figure

Claims (1)

[Claims] 1. In a mold for a resin lens, which has an optical lens surface in part and is used by coating at least the optical lens surface with a coating material, a part of the outer circumferential surface of the mold that is in contact with the optical lens surface. The outer diameter is determined in advance by 0.02~ from the final finish dimension.
After making the diameter smaller by 0.14 mm, it is covered with a coating material, and the outer peripheral surface of the mold is finished to the final finished dimensions.
A mold for forming a resin lens, characterized in that the outer peripheral surface of the mold is structured as a sliding surface.