Optical lens, optical system unit and imaging apparatus

An optical lens and light incident technology, applied in the direction of optical components, optics, instruments, etc., can solve the problems of reduced UV resistance and useless light transmittance of optical lenses, achieve excellent optical properties, suppress the change of refractive index with temperature, The effect of high durability

Inactive Publication Date: 2010-09-15
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in an optical lens made of a nanocomposite material containing such inorganic fine particles, ultraviolet resistance gradually decreases, and in relation thereto, the optical lens becomes practically useless due to deterioration of light transmittance over time

Method used

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  • Optical lens, optical system unit and imaging apparatus
  • Optical lens, optical system unit and imaging apparatus
  • Optical lens, optical system unit and imaging apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] [thermoplastic polymer]

[0018] The thermoplastic polymer (thermoplastic resin) effectively used for producing the optical lens of the present invention has a functional group capable of forming any kind of chemical bond with inorganic fine particles at least one of the main chain end (polymer chain end) or side chain.

[0019] Preferred examples of such thermoplastic polymers include:

[0020] (1) A thermoplastic polymer having at least one functional group selected from the following functional groups in the side chain:

[0021] [chemical formula 1]

[0022]

[0023] [R 11 , R 12 , R 13 and R 14 Each of may be any of the following groups: a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, or a substituted or unsubstituted aryl group] 、-SO 3 H, -OSO 3 H, -CO 2 H, and -Si(OR 15 ) m1 R 16 3-m1 [R 15 and R 16 Each of is a hydrogen atom, a substituted or...

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PUM

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Abstract

In a surveillance camera 2, an optical system unit for use in imaging is provided with a first lens 7, a second lens 8, a third lens 9, and a fourth lens 10, and a subject image is formed on a photoelectric surface 12 of an imaging element through a cover glass 11. The third lens 9 is an optical lens made of a nanocomposite material of the invention in which inorganic fine particles are dispersed. A thin film layer 15 that blocks UV rays is formed on a light incident surface of the third lens 9. After passing through the first lens 7 and the second lens 8, UV rays contained in subject light are blocked by the thin film layer 15 and therefore cannot enter the third lens 9.

Description

technical field [0001] The present invention relates to an optical lens made of a thermoplastic polymer, an optical system unit including the optical lens, and an imaging device using the optical system unit. Background technique [0002] Optical lenses formed from transparent plastic materials such as acrylic or PMMA are used in a variety of optical devices. In contrast to optical glass, conventional plastic materials that can be used to produce optical lenses have drawbacks such as the inability to increase the refractive index to high values ​​and the change in focal length with temperature as a function of the refractive index. In order to overcome the disadvantages, the use of various nanocomposite materials (organic-inorganic hybrid materials) in which nanoscale inorganic particles are dispersed in a plastic matrix has been investigated. [0003] The nanocomposite material disclosed in Japanese Patent Laid-Open No. 2005-055852 is obtained by adding niobium oxide (Nb ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B1/04C08K3/22C08L101/02G02B5/22
CPCG02B13/06G02B1/041
Inventor 山川博充宫野俊铃木荣一大林达彦渡边清一
Owner FUJIFILM CORP
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