Optical unit using plastic lenses
View Patent ↗The present invention provides an optical unit for high-resolution applications all lenses in which are made of plastics. The optical unit includes lens ( 1 ) and ( 2 ). The lens ( 1 ) is a plastic lens having an Abbe number of 45-60. The lens ( 2 ) is a lens injection molded from a polycarbonate material comprising a structure derived from spirobiindan and having a glass transition temperature of 120-150° C.
1. An optical unit comprising:
a first lens which is a plastic lens having an Abbe number of 45-60; and
a second lens which is a lens injection molded from a polycarbonate material comprising a polycarbonate copolymer (A) having structural units represented by the following general formulas (1) and (2):
where R 1 and R 3 are each independently an alkyl group, an alkoxy group, a nitro group or a halogen atom; R 2 is a hydrogen atom or a methyl group; k and l are each independently an integer of 0-3; m and n are each independently an integer of 0-20, provided that at least one of m and n is other than zero.
2. The optical unit according to claim 1 , wherein said polycarbonate material further contains 0.0005-5 parts by mass of an epoxy compound for 100 parts by mass of said polycarbonate copolymer (A).
3. The optical unit according to claim 1 , wherein said polycarbonate material further contains 0.0005-5 parts by mass of a phosphite compound for 100 parts by mass of said polycarbonate copolymer (A).
4. The optical unit according to claim 1 , wherein said polycarbonate material further contains 0.0005-5 parts by mass of an aliphatic compound for 100 parts by mass of said polycarbonate copolymer (A).
5. The optical unit according to claim 1 , wherein said polycarbonate material further contains 0.00005-0.5 parts by mass of a pentavalent phosphorus compound for 100 parts by mass of said polycarbonate copolymer (A).
6. The optical unit according to claim 1 , wherein the proportion of the structural units of the general formulas (1) and (2) that is occupied by the structural unit of the general formula (1) is 5-90 mol %.
7. The optical unit according to claim 1 , wherein said polycarbonate material (A) has a mass average molecular weight of 10,000-150,000.
8. An optical unit comprising:
a first lens which is a plastic lens having an Abbe number of 45-60; and
a second lens which is a lens injection molded from a polycarbonate material comprising a polycarbonate copolymer (B) having structural units represented by the following general formulas (2) and (3):
where R 3 's are each independently an alkyl group, an alkoxy group, a nitro group or a halogen atom; R 4 and R 5 are each independently a hydrogen atom or an alkyl group; R 6 's are each independently an alkyl group, an alkoxy group or a halogen atom; l's are each independently an integer of 0-3; and j's are each independently an integer of 0-2.
9. The optical unit according to claim 8 , wherein said polycarbonate material further contains 0.0005-5 parts by mass of an epoxy compound for 100 parts by mass of said polycarbonate copolymer (B).
10. The optical unit according to claim 8 , wherein said polycarbonate material further contains 0.0005-5 parts by mass of a phosphite compound for 100 parts by mass of said polycarbonate copolymer (B).
11. The optical unit according to claim 8 , wherein said polycarbonate material further contains 0.0005-5 parts by mass of an aliphatic compound for 100 parts by mass of said polycarbonate copolymer (B).
12. The optical unit according to claim 8 , wherein said polycarbonate material further contains 0.00005-0.5 parts by mass of a pentavalent phosphorus compound for 100 parts by mass of said polycarbonate copolymer (B).
13. The optical unit according to claim 8 , wherein the proportion of the structural units of the general formulas (2) and (3) that is occupied by the structural unit of the general formula (2) is 5-90 mol %.
14. The optical unit according to claim 8 , wherein said polycarbonate material (B) has a mass average molecular weight of 10,000-150,000.
15. An optical unit comprising:
a first lens which is a plastic lens having an Abbe number of 45-60; and
a second lens which is a lens injection molded from a polycarbonate material comprising a polycarbonate copolymer (C) that has structural units represented by the following general formulas (4), (5) and (6) and wherein the structural unit of the general formula (4) assumes 5-50 moles in all structural units:
16. The optical unit according to claim 15 , wherein said polycarbonate copolymer (C) is the product of reaction of 6,6′-dihydroxy-3,3,3′,3′-tetramethyl-1,1′-spirobiindan, 4,4′-[1,3-phenylenebis(1-methylethylidene)]bisphenol, 4,4′-[1,4-phenylenebis(1-methylethylidene)]bisphenol, and a carbonic ester forming compound.
17. The optical unit according to claim 15 , wherein said polycarbonate copolymer (C) is the product of reaction of 6,6′-dihydroxy-3,3,3′,3′-tetramethyl-1,1′-spirobiindan, 4,4′-[1,3-phenylenebis(1-methylethylidene)]bisphenol, 4,4′-[1,4-phenylenebis(1-methylethylidene)]bisphenol, and a carbonic ester forming compound; and
the amount in which 6,6′-dihydroxy-3,3,3′,3′-tetramethyl-1,1′-spirobiindan is used in said polycarbonate copolymer (C) is 10-90 mol % with respect to the sum of 6,6′-dihydroxy-3,3,3′,3′-tetramethyl-1,1′-spirobiindan and 4,4′-[1,3-phenylenebis(1-methylethylidene)]bisphenol.
18. The optical unit according to claim 15 , wherein the structural unit represented by the above general formula (5) assumes 20-80 mol % in all structural units of the polycarbonate copolymer (C).
19. An optical unit comprising:
a first lens which is a plastic lens having an Abbe number of 45-60; and
a second lens which is a lens injection molded from a polycarbonate material comprising a polycarbonate copolymer (D) that has structural units represented by the following general formulas (4), (5) and (7) and wherein the structural unit of the general formula (4) assumes 5-50 mole % in all structural units:
20. An optical unit comprising:
a first lens which is a plastic lens having an Abbe number of 45-60; and
a second lens which is a lens injection molded from a polycarbonate material comprising a polycarbonate copolymer (E) being the product of reaction of 6,6′-dihydroxy-3,3,3′,3′-tetramethyl-1,1′-spirobiindan, 4,4′-[1,3-phenylenebis(1-methylethylidene)]bisphenol, a compound having a trifunctional or higher phenolic hydroxyl group and a carbonic ester forming compound.
21. The optical unit according to claim 20 , wherein the amount in which 6,6′-dihydroxy-3,3,3′,3′-tetramethyl-1,1′-spirobiindan is used in said polycarbonate copolymer (E) is 10-90 mol % with respect to the sum of 6,6′-dihydroxy-3,3,3′,3′-tetramethyl-1,1′-spirobiindan and 4,4′-[1,3-phenylenebis(1-methylethylidene)]bisphenol.
22. The optical unit according to claim 20 , wherein said polycarbonate copolymer (E) contains the compound having a trifunctional or higher phenolic hydroxyl group added in an amount of 0.2-3.0 parts by mole with respect to 100 parts by mole as the sum of 6,6′-dihydroxy-3,3,3′,3′-tetramethyl-1,1′-spirobiindan and 4,4′-[1,3-phenylenebis(1-methylethylidene)]bisphenol.
23. The optical unit according to claim 20 , wherein the compound having a trifunctional or higher phenolic hydroxyl group in said polycarbonate copolymer (E) is at least one member of the group consisting of 1,1,1-tris(4-hydroxyphenyl)ethane, 4,4′-[1-[4-[1-(4-hydroxyphenyl)-1-methylethyl]phenyl]ethylidene]bisphenol, and 2,4,6-tris(4-hydroxyphenyl) -2,6-dimethyl-3-heptene.
24. The optical unit according to claim 1 , wherein said polycarbonate material has an intrinsic viscosity of 0.25-0.50.
25. The optical unit according to claim 1 , wherein said polycarbonate material has an intrinsic viscosity said intrinsic viscosity is 0.25-0.35.
26. The optical unit according to claim 8 , wherein said polycarbonate material has an intrinsic viscosity of 0.25-0.50.
27. The optical unit according to claim 8 , wherein said polycarbonate material has an intrinsic viscosity said intrinsic viscosity is 0.25-0.35.
28. The optical unit according to claim 15 , wherein said polycarbonate material has an intrinsic viscosity of 0.25-0.50.
29. The optical unit according to claim 15 , wherein said polycarbonate material has an intrinsic viscosity said intrinsic viscosity is 0.25-0.35.
30. The optical unit according to claim 19 , wherein said polycarbonate material has an intrinsic viscosity of 0.25-0.50.
31. The optical unit according to claim 19 , wherein said polycarbonate material has an intrinsic viscosity said intrinsic viscosity is 0.25-0.35.
32. The optical unit according to claim 20 , wherein said polycarbonate material has an intrinsic viscosity of 0.25-0.50.
33. The optical unit according to claim 20 , wherein said polycarbonate material has an intrinsic viscosity said intrinsic viscosity is 0.25-0.35.
34. The optical unit according to claim 1 , wherein said plastic lens having an Abbe number of 45-60 is fabricated from an alicyclic polyolefin resin.
35. The optical unit according to claim 8 , wherein said plastic lens having an Abbe number of 45-60 is fabricated from an alicyclic polyolefin resin.
36. The optical unit according to claim 15 , wherein said plastic lens having an Abbe number of 45-60 is fabricated from an alicyclic polyolefin resin.
37. The optical unit according to claim 19 , wherein said plastic lens having an Abbe number of 45-60 is fabricated from an alicyclic polyolefin resin.
38. The optical unit according to claim 20 , wherein said plastic lens having an Abbe number of 45-60 is fabricated from an alicyclic polyolefin resin.
39. The optical unit according to claim 1 , wherein said polycarbonate material further contains an ultraviolet absorber.
40. The optical unit according to claim 8 , wherein said polycarbonate material further contains an ultraviolet absorber.
41. The optical unit according to claim 15 , wherein said polycarbonate material further contains an ultraviolet absorber.
42. The optical unit according to claim 19 , wherein said polycarbonate material further contains an ultraviolet absorber.
43. The optical unit according to claim 20 , wherein said polycarbonate material further contains an ultraviolet absorber.