Polarizing lens made of aromatic polycarbonate

Inactive Publication Date: 2013-01-10
MITSUBISHI GAS CHEM CO INC +1
View PDF2 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent invention is about creating a special type of lens made from aromatic polycarbonate that has high accuracy in its shape. Specifically, it becomes possible to make these lenses with very precise shapes that have specific patterns on their surface. Additionally, the lenses can also be designed to have a high level of clarity, meaning they can accurately produce images. These new capabilities make it easier to create better quality optical components using a specific type of material.

Problems solved by technology

However, aromatic polycarbonate has, since it has a large photoelastic constant, problems in that when subjected to bending processing into a spheric or aspheric surface shape such as sunglasses and goggles, a colored interference pattern due to retardation easily occurs, this colored interference pattern detracts from the appearance, causes eyestrain and the like.
Also, a polarizing lens of an aromatic polycarbonate polarizing sheet bending processed into a spheric or aspheric surface shape has problems in that image distortion occurs due to thickness non-uniformity of the aromatic polycarbonate polarizing sheet, detracts from the appearance, and causes eyestrain and the like.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Polarizing lens made of aromatic polycarbonate
  • Polarizing lens made of aromatic polycarbonate
  • Polarizing lens made of aromatic polycarbonate

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0071](a) Stretched Polycarbonate Polarizing Sheet

[0072]As a stretched polycarbonate polarizing sheet for use in an aromatic polycarbonate polarizing lens, Iupilon Pola sheet with a thickness of 0.6 mm (made by Mitsubishi Gas Chemical Company) was used. The stretched polycarbonate polarizing sheet uses an aromatic polycarbonate sheet with a thickness of 0.3 mm, a retardation value of 5500 nm, and a glass transition point of 150° C. as a protective layer on both surfaces of the polarizing film, and is a polarizing sheet less likely to have a colored interference pattern occur in bending processing.

[0073](b) Aromatic Polycarbonate Polarizing Lens

[0074]The polarizing sheet of (a) was punched out with a complete round die with a diameter of 79.5 mm, the width in the vertical direction was cut into 55 mm, and bending processing was performed so as to correspond to the spheric surface (curvature radius 66.81 mm, base curve 7.932) of the mold used in injection molding, using a mold with th...

example 2

[0088]An aromatic polycarbonate polarizing lens from [2] obtained in the above (b) was subjected to heat treatment at a temperature of 130° C. using a forced hot air circulation oven for the time until the resolving power became not less than 20. At the heating temperature of 130° C., the resolving power became not less than 20 in the heating time of 1 hour.

[0089]In addition, when the base curves of the aromatic polycarbonate polarizing lens with a resolving power of not less than 20 were measured, the anisotropy of the base curves was not more than 0.1.

[0090]While the heating temperature was 120° C. and the heating time required for the anisotropy of the base curves to be not more than 0.1 was 12 to 48 hours in Example 1, the anisotropy of the base curves became not more than 0.1 in the heating time of 1 hour in Example 2.

[0091]Thus, by a method of appropriately selecting the temperature of heat treatment, an aromatic polycarbonate polarizing lens with very high shape accuracy coul...

reference example 1

[0092]Aromatic polycarbonate polarizing lenses prepared under each injection molding condition of the above (b) were heat treated at 120° C. for 1 hour using a forced hot air circulation oven. This heat treatment corresponds to calcination conditions of a hard coating of the conventional techniques.

[0093]The base curves of aromatic polycarbonate polarizing lenses before and after heat treatment were measured for 10 samples each, and the average values are shown in Table 3.

[0094]In aromatic polycarbonate polarizing lenses from all molding conditions [1] to [9], while the anisotropy of the base curves could be reduced after heat treatment as compared to the immediate post injection molding, it could not sufficiently be reduced for some molding conditions.

[0095]In these molding conditions, while there were molding conditions where the anisotropy of the base curves became not more than 0.25, this is the average value of 10 samples, all samples did not necessarily become not more than 0....

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Temperatureaaaaaaaaaa
Nanoscale particle sizeaaaaaaaaaa
Nanoscale particle sizeaaaaaaaaaa
Login to view more

Abstract

The present invention relates to a polarizing lens molded by inserting a polarizing sheet bent into a sphere or an asphere after having an aromatic polycarbonate sheet bonded via an adhesive layer to both surfaces of a film with polarized nature into a mold, and injecting aromatic polycarbonate, wherein heat treatment at a temperature not less than a temperature of 50° C. lower than the glass transition point and less than the glass transition point for an appropriate time has been performed after injecting aromatic polycarbonate to approximate a designed value of the lens curvature.

Description

TECHNICAL FIELD[0001]The present invention relates to a polarizing lens made of aromatic polycarbonate molded by injecting aromatic polycarbonate into one surface of a polarizing sheet.RELATED ART[0002]A polarizing sheet made of polycarbonate, which is excellent in impact resistance and lightweight, is used for liquid crystal displays, windows of buildings and sunroofs of automobiles, and sunglasses and goggles for use in ocean sports, winter sports, fishing, and the like.[0003]A polarizing sheet having an aromatic polycarbonate sheet as a protective layer bonded via an adhesive layer to both surfaces of a polarizing film of polyvinyl alcohol film stretched and dyed with a dichroic dye (hereinafter, aromatic polycarbonate polarizing sheet), which is particularly excellent in impact resistance and in addition has high heat resistance at the same time, is used in a polarizing lens for sunglasses and goggles obtained by bending processing and injection molding.[0004]However, aromatic p...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G02C7/12
CPCB29C45/14811B29C45/7207B29K2069/00B29K2669/00B29K2715/006B29K2995/0034B29D11/0073B29L2011/0016G02B5/3033G02C7/12B29D11/00644B29C2045/14237B29C61/00B29L2011/00
Inventor TOKUMARU, TERUTAKASUZUKI, KATSUNORISHIMOMAI, KENYAGOURA, MASAKINAKAMURA, KYOUSUKEOHKUBO, AKIO
Owner MITSUBISHI GAS CHEM CO INC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap