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Molular for optical lens injection moulding

An optical lens, injection molding technology, applied in the direction of optical components, household appliances, other household appliances, etc., can solve the problem of reducing the replication of the peripheral part A

Inactive Publication Date: 2012-10-03
KONICA MINOLTA OPTO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the reproducibility of the outer peripheral portion A of the optical surface 1001a will also be reduced in the same manner.

Method used

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  • Molular for optical lens injection moulding
  • Molular for optical lens injection moulding
  • Molular for optical lens injection moulding

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0043] Below, refer to Figure 1 to Figure 5 The mold 1 in the first embodiment will be described.

[0044] The molding of the plastic lens is carried out using the method as described above, but if there is almost no gap between the movable core 10 on the side of the cavity 50 and the movable template 20 located on its outer peripheral surface, even if the movable core 10 adopts heat conduction For materials with a low rate, the heat of the outer peripheral portion of the movable core 10 is also taken away by the movable die plate 20, so that the mold surface temperature of the outer peripheral portion of the movable core 10 is lowered. As a result, the reproducibility of the outer peripheral part of the movable core 10 will fall. Here, it is preferable to provide a gap between the movable core 10 and the movable die plate 20 . pass Figure 4 and Table 1 illustrate this.

[0045] Figure 4 Make figure 1 A magnified view of region C of .

[0046]A gap 10 b is provided ...

no. 2 approach

[0053] Below, refer to Figure 6 ~ Figure 11 The mold 101 in the second embodiment will be described.

[0054] The molding of the plastic lens 200 is carried out using the method as described above, but if the movable mold plate 120 on the outer periphery of the movable core 110 is set at a position close to the outer periphery of the optical surface 110a, even the movable type The core 110 is made of a material with low thermal conductivity, and the heat of the outer peripheral portion of the optical surface 110 a is also taken away by the movable template 120 . As a result, the reproducibility of the outer peripheral part of the optical surface 110a will fall. Here, based on the relationship between the length of the optical surface 110a of the plastic lens 200 and the external length of the movable core 110, the distance between the outer periphery of the optical surface 110a and the movable template 120 is preferably an appropriate value. pass Figures 9 to 11 and Table...

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PUM

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Abstract

The present invention relates a sort of injection forming mold used for optic lens, whose structure is: the clearance of core formed by at least one of the mobile side and the fixed side and the mould is larger at the optical surface, or, if the X is the length of the optic lens, and Y is the length of the shaping core's external shape at the optical surface, then it will meet the following relation : 1.5 is less than or equals to Y / X, and Y / X is less than or equals to 2.5.

Description

technical field [0001] The present invention relates to a mold for injection molding of an optical lens that is filled with a molten material to form an optical lens. Background technique [0002] In recent years, light-weight plastic lenses are used as optical lenses, optical devices such as optical pickup devices and cameras using plastic lenses are often seen. The manufacture of such a plastic lens is mainly performed by injection molding using a mold, and there is a technique described in Patent Document 1 as a mold for injection molding. [0003] according to Figure 13 A conventional optical lens injection molding die 1000 will be described. Figure 13 The shown optical lens injection molding mold 1000 fills the molten material in the cavity 1003, and its structure is: the optical surface 1001a of the optical lens is formed by a core (optical surface forming core) 1001, except for the optical surface of the optical lens. A portion 1002a of is formed by a template 1002...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C45/26B29L11/00
Inventor 清水勉和田一启
Owner KONICA MINOLTA OPTO