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Method of manufacturing multifocal lens and multifocal lens

A multi-focal lens and manufacturing method technology, applied in the direction of lenses, manufacturing tools, glass pressing, etc., can solve problems such as difficulties, complex lens surface design shapes, etc., to achieve easy design and manufacture, good optical properties, and reduced skew or the effect of eccentricity

Inactive Publication Date: 2007-08-29
HOYA LENS MFG PHILIPPINES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of multifocal lenses, it is more difficult due to the more complex design shape of the lens surface

Method used

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  • Method of manufacturing multifocal lens and multifocal lens
  • Method of manufacturing multifocal lens and multifocal lens
  • Method of manufacturing multifocal lens and multifocal lens

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0077] 1 to 7 show a first embodiment of the present invention. The first embodiment is a multifocal lens 1 with a three-layer structure in one set.

[0078] In FIG. 1, the multifocal lens 1 of 1st Embodiment is shown. As shown in the cross-sectional view of Fig. 1(A), the multifocal lens 1 has the following structure: from the convex side, the glass yield point temperature is At 1 The first lens 11 (hereinafter also referred to simply as "lens 11"), the glass yield point temperature is At 2 The second lens 12 (hereinafter also referred to simply as "lens 12"), and the glass yield point temperature is At 3 The third lens 13 (hereinafter also simply referred to as "lens 13"). Here, the above glass yield point temperature has At 1 >At 2 >At 3 Relationship. In addition, the glass transition temperature of each of these lenses has Tg 1>Tg 2 >Tg 3 The relationship, meanwhile, has Tg 1 >At 2 and Tg 2 >At 3 Relationship.

[0079] In addition, as can be seen from the to...

no. 2 Embodiment approach

[0109] Next, a second embodiment of the present invention will be described with reference to FIGS. 8 and 9 . The second embodiment differs from the first embodiment in the number and arrangement of lenses located in the middle, and the other configurations are the same as those of the first embodiment.

[0110] As shown in FIG. 8(A)(B), the multifocal lens 2 of a group of 3-layer structure in the second embodiment is composed of 3 layers of lens 21, lens 22 and lens 23, but the lens 22 located in the middle is arranged in the A position off the optical axis of the lenses 21,23. As shown in Figure 8 (B), in the present embodiment, four lenses 22 are arranged on concentric circles centered on the optical axis, but the lenses 22 do not necessarily have to be located on the concentric circles. Optical properties, any number can be arranged at any position.

[0111] Such a multifocal lens 2 can also be manufactured in the same manner as in the first embodiment.

[0112] Specifi...

no. 3 Embodiment approach

[0114] Next, a third embodiment of the present invention will be described with reference to FIGS. 10 and 11 . The third embodiment differs from the first embodiment in the shape of the middle lens, and the other configurations are the same as those of the first embodiment.

[0115] In the multifocal lens 3 of the third embodiment shown in FIG. 10 , the lens 32 located in the middle is formed in a ring shape without a central portion. Such a multifocal lens 3 can also be manufactured in the same manner as the above-mentioned manufacturing method.

[0116] Specifically, as shown in FIG. 11 , molding starts from the first lens 31 having the highest glass deformation point temperature. A concave portion 31A is formed in a portion of the first lens 31 corresponding to the position where the second lens 32 is arranged, and the posture of the lower mold 301 is controlled so that the concave portion 31A faces upward.

[0117] As shown in FIG. 11(B), the second lens blank 32' is an ...

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Abstract

The present invention provides a method of manufacturing multifocal lens and multifocal lens. The method can simply obtain a multifocal lens having excellent optical performance, and is a manufacturing method for a multifocal lens having one group three layers structures by using three lens materials having glass deformation point temperatures of At<1>, At<2> and At<3> and forming the lens materials by heated-die pressing process. The glass deformation point temperature has a relation of At<1>At<2>At<3>. After a first lens is formed by a first lens material with a glass deformation point temperatures At<1>, the first lens will be made as one portion of a forming module to form a second lens material with a glass deformation point temperatures At<2> to form a second lens, and the second lens is jointed to the first lens, then the first lens and the second lens are made as one portion of a form module to form a third lens material with a glass deformation point temperatures At<3> to form a third lens, and the third lens is jointed to the first lens and the second lens.

Description

technical field [0001] The invention relates to a method for manufacturing a multifocal lens and the multifocal lens. Background technique [0002] Conventionally, lenses, which are optical components, have been widely used in glasses, cameras, and the like. As a lens, it can be divided into a single focus lens with only one focal point and a multifocal lens with multiple focal points. [0003] As a multifocal lens, there have been proposed structures as follows: as shown in FIG. 35(A), a lens A in which a region with a different curvature is formed on a part of the optical surface; as shown in FIG. 35(B), an adhesive Lens B joined to another lens on a part of the optical surface of the lens; or lens C joined to different blanks at the periphery and center of the lens as shown in FIG. 35(C) (for example, refer to Patent Document 1). [0004] In addition, as a method of manufacturing a stacked single-focus lens, a method has been proposed in which the convex surface of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B3/10C03B11/08
Inventor 清水章弘西浩太后藤顺孝宫泽贵则
Owner HOYA LENS MFG PHILIPPINES INC