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Method for producing plastic lens

A technology of plastic lens and manufacturing method, applied to other household appliances, optical components, household appliances, etc., to achieve the effect of preventing weld lines

Active Publication Date: 2013-07-03
HOYA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a tendency that a so-called "weld line" tends to occur when the resin flowing in the inner cavity spreads and merges at the edge of the lens at the edge of the lens opposite to the gate. linear trace
When such a weld line occurs, the defect in appearance or the reduction in strength due to the weld line will adversely affect the quality of the molded plastic lens.

Method used

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  • Method for producing plastic lens
  • Method for producing plastic lens
  • Method for producing plastic lens

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Experimental program
Comparison scheme
Effect test

no. 1 approach

[0047] First, a first embodiment of the present invention will be described. The shape of the plastic lens to be molded in this embodiment is not particularly limited. The present invention can also be applied to a method in which a semi-finished lens called a "semi-finished lens" is finished into a final shape by pre-molding a lens in a semi-finished state thicker than the finished product size, and post-processing.

[0048] 【Injection Molding Equipment】

[0049] figure 1 It is an explanatory diagram showing an example of an injection molding facility, and the method of manufacturing a plastic lens according to the present embodiment can be implemented using such an injection molding facility as appropriate.

[0050] figure 1The injection molding equipment shown is provided with: forming mold 50, clamping device 60, and injection device 80, wherein, forming mold 50 has movable mold 1 and fixed mold 2, and this movable mold 1 and fixed mold 2 utilize parting surface (parti...

no. 2 approach

[0105] Next, a second embodiment of the present invention will be described. In this embodiment, a negative lens (concave lens) having a thin lens center and a thick lens edge is used as a molding object. The injection molding equipment suitable for the implementation of this embodiment, except that the inner cavity 3 formed between the movable mold 1 and the fixed mold 2 of the molding mold 50 is formed corresponding to the shape of the negative lens, is suitable for the first The injection molding equipment implemented in the embodiment is the same. Thus, in Figure 7 ~ Figure 10 In the figure, the cross section of the molding die 50 in which the cavity 3 is formed corresponding to the shape of the negative lens is shown, and the same reference numerals are assigned to the common configurations, and repeated description of the injection molding equipment is omitted.

[0106] in addition, Figure 7 It is a cross-sectional view showing the outline of the molding die 50 used...

Embodiment 1

[0118] exist figure 1 In the injection molding equipment shown, the molding surface of the insert 11 on the side of the movable mold 1 and the side of the fixed mold 2 are respectively formed using insulating materials 11a and 12a composed of crown glass raw materials and having a thermal conductivity of 1.1W / m·K. The forming surface of the insert 12.

[0119] Using this injection molding equipment, polycarbonate is used as the raw material resin and the resin temperature is set to 290°C. At the same time, the setting of the mold temperature is changed to 125°C, 115°C, 85°C, 75°C, and 55°C. , 35° C., and a plastic lens having a thickness of 10 mm at the center of the lens, a thickness of 12.5 mm at the edge of the lens, and a diameter of 77 mm was formed.

[0120] As a result of checking the surface of the molded plastic lens, no surface defects were observed when the mold temperature was set at 125°C, 115°C, 85°C, 75°C, and 55°C, and when the mold temperature was lowered to ...

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Abstract

There is provided a method for producing a plastic lens in which, without heating a die, a resin injected and filled into a cavity can be maintained at a temperature higher than a glass transition temperature of the resin only for a time until the filling of the resin into the cavity terminates, whereby the generation of a surface defect such as jetting or a flow mark, or a weld line can be prevented. In producing the plastic lens having a predetermined lens shape by injecting and filling a molten raw material resin into a cavity 3 formed between a movable die 1 and a fixed die 2, a part or all of a molding surface of at least one of inserts 11 and 12 as cavity forming members is formed by using insulating materials 11a and 12a made of a glass raw material.

Description

technical field [0001] The invention relates to a method for manufacturing plastic lenses. Background technique [0002] In general, plastic lenses for eyeglasses are manufactured by injection molding using thermoplastic resins such as polycarbonate resins and methacrylic resins. Even plastic lenses with complex optical plane shapes such as progressive diopter lenses can be reproduced The shape of the inner cavity of the molding die is molded with high precision. [0003] However, in the injection molding method, in order to improve the quality of the molded product by improving the reproducibility, or to improve the productivity by shortening the cooling time, there are cases where the mold temperature is lowered and the molding is performed. However, when molding is performed at a lower mold temperature, surface defects called "jetting" or "flow marks" tend to easily occur. [0004] Here, the so-called "jet mark" refers to the following phenomenon, that is, when injectin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/03B29L11/00
CPCB29D11/00413B29L2011/0016B29C45/561B29C33/38B29C2045/5615B29C2045/564B29C2045/7356B29D11/00019
Inventor 高鸟范生佐藤清悟
Owner HOYA CORP