Imaging lens

A technology of camera lens and polycarbonate resin, applied in the field of camera lens, can solve the problems of low heat resistance and brittle resin, and achieve the effects of low water absorption, remarkable effect and low birefringence

Active Publication Date: 2018-01-02
TEIJIN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since this patent document contains a polystyrene component, and incompatible components are mixed together, there is a problem that the resin is brittle and the heat resistance is low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3、 comparative example 1～4

[0066] Evaluation was implemented by the following method.

[0067] (1) Specific viscosity: The polycarbonate resin obtained after the polymerization was fully dried, and a solution obtained by dissolving 0.7 g of the pellets in 100 ml of methylene chloride was used to measure the specific viscosity (ηsp) at 20° C. of the solution.

[0068] (2) Copolymerization ratio: measured by proton NMR using JNM-AL400 manufactured by JEOL Ltd. It was determined by the integral ratio of the peak due to the structure of formula (1) around 7.6 to 7.8 ppm and the peak due to the structure of formula (2) around 0.8 to 1.1 ppm.

[0069] (3) Refractive index (nD), Abbe's number (ν): The refractive index at 25° C. was measured on a disc with a thickness of 0.3 mm and a diameter of 5 mm obtained by injection molding using an Abbe refractometer DR-M2 manufactured by ATAGO. The Abbe's number was calculated from the refractive index of measurement wavelength: 486 nm, 589 nm, and 656 nm by the follow...

Embodiment 1

[0086] 110.50 parts of 9,9-bis(4-(2-hydroxyethoxy)phenyl)fluorene (hereinafter, abbreviated as BPEF), 3,9-bis(1,1-dimethyl-2-hydroxyethyl )-2,4,8,10-tetraoxaspiro[5.5]undecane (hereinafter, abbreviated as SPG) 45.05 parts, diphenyl carbonate 87.40 parts, and sodium hydroxide as a catalyst 8.00×10 －5 Parts, Tetramethylammonium Hydroxide 3.65×10 －3 Parts were put into a reaction kettle with a stirrer and a distillation device, and after three times of nitrogen replacement, the jacket was heated to 180°C to melt the raw materials. After complete melting, the jacket was heated up to 260° C. at a rate of 60° C. / hr while depressurizing to 20 kPa over 20 minutes to conduct a transesterification reaction. Thereafter, with the jacket kept at 260°C, the pressure was reduced to 0.13 kPa over 80 minutes, and a polymerization reaction was performed at 260°C and 0.13 kPa or less for 30 minutes. After the reaction, the produced polycarbonate resin is granulated and extracted to obtain poly...

Embodiment 2

[0088]Polycarbonate resin particles were obtained in the same manner as in Example 1 except that BPEF was 105.24 parts and SPG was 48.70 parts. Using these pellets, the measurement was carried out in the same manner as in Example 1, and the results are shown in Table 1.

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Abstract

An imaging lens comprising a polycarbonate that contains formulae (1) and (2) in the proportions indicated below, said imaging lens having a specific refractive index and Abbe number, and having the physical characteristics of a low birefringence and coefficient of water absorption. 50 mol%<=(1)<70 mol%; 30 mol%<(2)<=50 mol%.

Description

technical field [0001] The present invention relates to an imaging lens made of a specific polycarbonate resin. Background technique [0002] In recent years, almost all mobile phones are equipped with a camera function, and recently, mobile phones equipped with a high-resolution camera function comparable to digital still cameras have appeared. The pixel size of the imaging element is miniaturized, and the pixel pitch is less than 1.4 microns. On the other hand, in response to downsizing and thinning of mobile phones, downsizing of imaging lenses is also required. Therefore, in order to cope with the high resolution of the imaging element and the miniaturization of the imaging lens, it is urgently required to reduce the birefringence of the imaging lens and improve the aberration correction capability. Conventionally, imaging lenses for portable devices such as mobile phones and smartphones are made of aspheric plastics, and aberration correction is performed by combining...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B1/04C08G64/16G02B13/00
CPCC08G64/16G02B1/04G02B13/00C08G64/302C08G64/307G02B1/041
Inventor 布目和德松井学梅木笃志
Owner TEIJIN LTD
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