Optical lens

• US 8,854,733 B2
• Filed: 12/26/2008
• Issued: 10/07/2014
• Est. Priority Date: 12/28/2007
• Status: Active Grant

• Current Assignee: Sumitomo Electric Fine Polymer Incorporated (Sumitomo Corporation)
• Original Assignee: Sumitomo Electric Fine Polymer Incorporated (Sumitomo Corporation)
• Inventors: Nakabayashi, Makoto
• Primary Examiner(s): Ahvazi, Bijan
• Assistant Examiner(s): Cai, Wenwen
• Application Number:
  US12/810,686
• Publication Number:
  US 20100271703A1
• Time in Patent Office: 2,111 Days
• Field of Search: 524/553, 524/555, 524/556, 524/81, 359/581, 428/336
• US Class Current: 359/581
• CPC Class Codes: C08L 77/00 Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain of polyhydrazides C08L79/06; of polyamideimides or polyamide acids C08L79/08; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 77/02 Polyamides derived from omega-amino carboxylic acids or from lactams thereof C08L77/10 takes precedence
• CPC Class Codes: C08L 77/06 Polyamides derived from polyamines and polycarboxylic acids C08L77/10 takes precedence
• CPC Class Codes: G02B 1/041 Lenses
• CPC Class Codes: G02B 3/08 with discontinuous faces, e.g. Fresnel lens diffractive Fresnel lenses G02B5/1876
• CPC Class Codes: G03B 15/00 Special procedures for taking photographs; Apparatus therefor
• CPC Class Codes: Y10T 428/265 1 mil or less

Abstract

An optical lens made of resin, which includes a molded body made of a molding material containing a transparent polyamide such as polyamide 12 and a stabilizer, which has total light transmittance of at least 60% when the molded body has a thickness of 2 mm, and has total light transmittance of at least 50% after the molded body maintained at 80° C. was irradiated with light in an amount of 1000 W/m² for 500 hours by using a xenon lamp, which is lightweight, highly transparent, and resistant to discoloration, deformation, aging, and the like due to irradiation with light emitted from a xenon lamp, a blue-violet laser or the like serving as a light source, and which is suitable for use in a light emitting device of a flash lamp and the like, is provided.

Claims

1. An optical lens comprising a molded body made of a molding material containing a transparent polyamide cross-linked through irradiation with radioactive rays and a stabilizer,

said optical lens having total light transmittance of at least 60% when said molded body has a thickness of 2 mm, and having total light transmittance of at least 50% after said molded body maintained at 80°

C. is irradiated with light in an amount of 1000 W/m² for 500 hours by using a xenon lamp,

said transparent polyamide is composed of a condensation polymer of 1,10-decanedicarboxylic acid and 3,3′

-dimethyl-4,4′

-diaminodicyclohexylmethane,

a blend ratio of said stabilizer being 0.01 to 0.21 parts by weight with respect to 100 parts by weight said transparent polyamide, and

said stabilizer including 2-methyl-6-ethyl-hydroquinone.

2. The optical lens according to claim 1, wherein

said transparent polyamide is a polyamide having an aromatic ring or an aliphatic ring, or a polyamide having a carbon number of at least 10 obtained by ring-opening polymerization of lactam or condensation of ω

-aminocarboxylic acid.

3. The optical lens according to claim 1, wherein

said transparent polyamide is composed of a monomer constituted only of chemical bond having a main polarizability of 0.6×

10<sup>−

23</sup> or less.

4. The optical lens according to claim 1, wherein

said molded body of transparent resin has a storage modulus of elasticity at 270°

C. of at least 0.1 MPa.

5. The optical lens according to claim 1, wherein

said molding material further contains a filler.

6. The optical lens according to claim 1, wherein

said molding material further contains less than 25 parts by weight TAIC with respect to 100 parts by weight transparent polyamide.

7. The optical lens according to claim 1, comprising a coating film made of an inorganic compound and having total light transmittance of at least 80% on at least one surface thereof.

8. The optical lens according to claim 7, wherein

said inorganic compound is selected from the group consisting of MgF₂, YF₃, LaF₃, CeF₃, BaF₂, HfO₂, SiO₂, TiO₂, Al₂O₃, Y₂O₃, La₂O₃, Ta₂O₅, and ZrO₂.

9. The optical lens according to claim 7, wherein

said coating film is formed of two or more layers.

10. The optical lens according to claim 9, wherein

said coating film is formed of a lower layer made of SiO₂ and having a thickness of 5 to 20 nm, an intermediate layer formed on said lower layer, made of TiO₂ and having a thickness of 5 to 20 nm, and an upper layer formed on said intermediate layer, made of SiO₂ and having a thickness of 5 to 20 nm.